>> 1 /* -*- mode: asm -*-
>> 2 **
>> 3 ** head.S -- This file contains the initial boot code for the
>> 4 ** Linux/68k kernel.
>> 5 **
>> 6 ** Copyright 1993 by Hamish Macdonald
>> 7 **
>> 8 ** 68040 fixes by Michael Rausch
>> 9 ** 68060 fixes by Roman Hodek
>> 10 ** MMU cleanup by Randy Thelen
>> 11 ** Final MMU cleanup by Roman Zippel
>> 12 **
>> 13 ** Atari support by Andreas Schwab, using ideas of Robert de Vries
>> 14 ** and Bjoern Brauel
>> 15 ** VME Support by Richard Hirst
>> 16 **
>> 17 ** 94/11/14 Andreas Schwab: put kernel at PAGESIZE
>> 18 ** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari
>> 19 ** ++ Bjoern & Roman: ATARI-68040 support for the Medusa
>> 20 ** 95/11/18 Richard Hirst: Added MVME166 support
>> 21 ** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with
>> 22 ** Magnum- and FX-alternate ram
>> 23 ** 98/04/25 Phil Blundell: added HP300 support
>> 24 ** 1998/08/30 David Kilzer: Added support for font_desc structures
>> 25 ** for linux-2.1.115
>> 26 ** 9/02/11 Richard Zidlicky: added Q40 support (initial vesion 99/01/01)
>> 27 ** 2004/05/13 Kars de Jong: Finalised HP300 support
>> 28 **
>> 29 ** This file is subject to the terms and conditions of the GNU General Public
>> 30 ** License. See the file README.legal in the main directory of this archive
>> 31 ** for more details.
>> 32 **
>> 33 */
>> 34
1 /* 35 /*
2 * Copyright (C) 2007-2009 Michal Simek <monstr !! 36 * Linux startup code.
3 * Copyright (C) 2007-2009 PetaLogix !! 37 *
4 * Copyright (C) 2006 Atmark Techno, Inc. !! 38 * At this point, the boot loader has:
5 * !! 39 * Disabled interrupts
6 * MMU code derived from arch/ppc/kernel/head_ !! 40 * Disabled caches
7 * Copyright (c) 1995-1996 Gary Thomas <gdt@ !! 41 * Put us in supervisor state.
8 * Initial PowerPC version. !! 42 *
9 * Copyright (c) 1996 Cort Dougan <cort@cs.n !! 43 * The kernel setup code takes the following steps:
10 * Rewritten for PReP !! 44 * . Raise interrupt level
11 * Copyright (c) 1996 Paul Mackerras <paulus !! 45 * . Set up initial kernel memory mapping.
12 * Low-level exception handers, MMU suppo !! 46 * . This sets up a mapping of the 4M of memory the kernel is located in.
13 * Copyright (c) 1997 Dan Malek <dmalek@jlc. !! 47 * . It also does a mapping of any initial machine specific areas.
14 * PowerPC 8xx modifications. !! 48 * . Enable the MMU
15 * Copyright (c) 1998-1999 TiVo, Inc. !! 49 * . Enable cache memories
16 * PowerPC 403GCX modifications. !! 50 * . Jump to kernel startup
17 * Copyright (c) 1999 Grant Erickson <grant@ !! 51 *
18 * PowerPC 403GCX/405GP modifications. !! 52 * Much of the file restructuring was to accomplish:
19 * Copyright 2000 MontaVista Software Inc. !! 53 * 1) Remove register dependency through-out the file.
20 * PPC405 modifications !! 54 * 2) Increase use of subroutines to perform functions
21 * PowerPC 403GCX/405GP modifications. !! 55 * 3) Increase readability of the code
22 * Author: MontaVista Software, Inc. !! 56 *
23 * frank_rowand@mvista.com or sou !! 57 * Of course, readability is a subjective issue, so it will never be
24 * debbie_chu@mvista.com !! 58 * argued that that goal was accomplished. It was merely a goal.
25 * !! 59 * A key way to help make code more readable is to give good
26 * This file is subject to the terms and condi !! 60 * documentation. So, the first thing you will find is exaustive
27 * License. See the file "COPYING" in the main !! 61 * write-ups on the structure of the file, and the features of the
28 * for more details. !! 62 * functional subroutines.
>> 63 *
>> 64 * General Structure:
>> 65 * ------------------
>> 66 * Without a doubt the single largest chunk of head.S is spent
>> 67 * mapping the kernel and I/O physical space into the logical range
>> 68 * for the kernel.
>> 69 * There are new subroutines and data structures to make MMU
>> 70 * support cleaner and easier to understand.
>> 71 * First, you will find a routine call "mmu_map" which maps
>> 72 * a logical to a physical region for some length given a cache
>> 73 * type on behalf of the caller. This routine makes writing the
>> 74 * actual per-machine specific code very simple.
>> 75 * A central part of the code, but not a subroutine in itself,
>> 76 * is the mmu_init code which is broken down into mapping the kernel
>> 77 * (the same for all machines) and mapping machine-specific I/O
>> 78 * regions.
>> 79 * Also, there will be a description of engaging the MMU and
>> 80 * caches.
>> 81 * You will notice that there is a chunk of code which
>> 82 * can emit the entire MMU mapping of the machine. This is present
>> 83 * only in debug modes and can be very helpful.
>> 84 * Further, there is a new console driver in head.S that is
>> 85 * also only engaged in debug mode. Currently, it's only supported
>> 86 * on the Macintosh class of machines. However, it is hoped that
>> 87 * others will plug-in support for specific machines.
>> 88 *
>> 89 * ######################################################################
>> 90 *
>> 91 * mmu_map
>> 92 * -------
>> 93 * mmu_map was written for two key reasons. First, it was clear
>> 94 * that it was very difficult to read the previous code for mapping
>> 95 * regions of memory. Second, the Macintosh required such extensive
>> 96 * memory allocations that it didn't make sense to propagate the
>> 97 * existing code any further.
>> 98 * mmu_map requires some parameters:
>> 99 *
>> 100 * mmu_map (logical, physical, length, cache_type)
>> 101 *
>> 102 * While this essentially describes the function in the abstract, you'll
>> 103 * find more indepth description of other parameters at the implementation site.
>> 104 *
>> 105 * mmu_get_root_table_entry
>> 106 * ------------------------
>> 107 * mmu_get_ptr_table_entry
>> 108 * -----------------------
>> 109 * mmu_get_page_table_entry
>> 110 * ------------------------
>> 111 *
>> 112 * These routines are used by other mmu routines to get a pointer into
>> 113 * a table, if necessary a new table is allocated. These routines are working
>> 114 * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root
>> 115 * table needs of course only to be allocated once in mmu_get_root_table_entry,
>> 116 * so that here also some mmu specific initialization is done. The second page
>> 117 * at the start of the kernel (the first page is unmapped later) is used for
>> 118 * the kernel_pg_dir. It must be at a position known at link time (as it's used
>> 119 * to initialize the init task struct) and since it needs special cache
>> 120 * settings, it's the easiest to use this page, the rest of the page is used
>> 121 * for further pointer tables.
>> 122 * mmu_get_page_table_entry allocates always a whole page for page tables, this
>> 123 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
>> 124 * to manage page tables in smaller pieces as nearly all mappings have that
>> 125 * size.
>> 126 *
>> 127 * ######################################################################
>> 128 *
>> 129 *
>> 130 * ######################################################################
>> 131 *
>> 132 * mmu_engage
>> 133 * ----------
>> 134 * Thanks to a small helping routine enabling the mmu got quite simple
>> 135 * and there is only one way left. mmu_engage makes a complete a new mapping
>> 136 * that only includes the absolute necessary to be able to jump to the final
>> 137 * postion and to restore the original mapping.
>> 138 * As this code doesn't need a transparent translation register anymore this
>> 139 * means all registers are free to be used by machines that needs them for
>> 140 * other purposes.
>> 141 *
>> 142 * ######################################################################
>> 143 *
>> 144 * mmu_print
>> 145 * ---------
>> 146 * This algorithm will print out the page tables of the system as
>> 147 * appropriate for an 030 or an 040. This is useful for debugging purposes
>> 148 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
>> 149 *
>> 150 * ######################################################################
>> 151 *
>> 152 * console_init
>> 153 * ------------
>> 154 * The console is also able to be turned off. The console in head.S
>> 155 * is specifically for debugging and can be very useful. It is surrounded by
>> 156 * #ifdef CONSOLE/#endif clauses so it doesn't have to ship in known-good
>> 157 * kernels. It's basic algorithm is to determine the size of the screen
>> 158 * (in height/width and bit depth) and then use that information for
>> 159 * displaying an 8x8 font or an 8x16 (widthxheight). I prefer the 8x8 for
>> 160 * debugging so I can see more good data. But it was trivial to add support
>> 161 * for both fonts, so I included it.
>> 162 * Also, the algorithm for plotting pixels is abstracted so that in
>> 163 * theory other platforms could add support for different kinds of frame
>> 164 * buffers. This could be very useful.
>> 165 *
>> 166 * console_put_penguin
>> 167 * -------------------
>> 168 * An important part of any Linux bring up is the penguin and there's
>> 169 * nothing like getting the Penguin on the screen! This algorithm will work
>> 170 * on any machine for which there is a console_plot_pixel.
>> 171 *
>> 172 * console_scroll
>> 173 * --------------
>> 174 * My hope is that the scroll algorithm does the right thing on the
>> 175 * various platforms, but it wouldn't be hard to add the test conditions
>> 176 * and new code if it doesn't.
>> 177 *
>> 178 * console_putc
>> 179 * -------------
>> 180 *
>> 181 * ######################################################################
>> 182 *
>> 183 * Register usage has greatly simplified within head.S. Every subroutine
>> 184 * saves and restores all registers that it modifies (except it returns a
>> 185 * value in there of course). So the only register that needs to be initialized
>> 186 * is the stack pointer.
>> 187 * All other init code and data is now placed in the init section, so it will
>> 188 * be automatically freed at the end of the kernel initialization.
>> 189 *
>> 190 * ######################################################################
>> 191 *
>> 192 * options
>> 193 * -------
>> 194 * There are many options available in a build of this file. I've
>> 195 * taken the time to describe them here to save you the time of searching
>> 196 * for them and trying to understand what they mean.
>> 197 *
>> 198 * CONFIG_xxx: These are the obvious machine configuration defines created
>> 199 * during configuration. These are defined in include/linux/autoconf.h.
>> 200 *
>> 201 * CONSOLE: There is support for head.S console in this file. This
>> 202 * console can talk to a Mac frame buffer, but could easily be extrapolated
>> 203 * to extend it to support other platforms.
>> 204 *
>> 205 * TEST_MMU: This is a test harness for running on any given machine but
>> 206 * getting an MMU dump for another class of machine. The classes of machines
>> 207 * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.)
>> 208 * and any of the models (030, 040, 060, etc.).
>> 209 *
>> 210 * NOTE: TEST_MMU is NOT permanent! It is scheduled to be removed
>> 211 * When head.S boots on Atari, Amiga, Macintosh, and VME
>> 212 * machines. At that point the underlying logic will be
>> 213 * believed to be solid enough to be trusted, and TEST_MMU
>> 214 * can be dropped. Do note that that will clean up the
>> 215 * head.S code significantly as large blocks of #if/#else
>> 216 * clauses can be removed.
>> 217 *
>> 218 * MMU_NOCACHE_KERNEL: On the Macintosh platform there was an inquiry into
>> 219 * determing why devices don't appear to work. A test case was to remove
>> 220 * the cacheability of the kernel bits.
>> 221 *
>> 222 * MMU_PRINT: There is a routine built into head.S that can display the
>> 223 * MMU data structures. It outputs its result through the serial_putc
>> 224 * interface. So where ever that winds up driving data, that's where the
>> 225 * mmu struct will appear. On the Macintosh that's typically the console.
>> 226 *
>> 227 * SERIAL_DEBUG: There are a series of putc() macro statements
>> 228 * scattered through out the code to give progress of status to the
>> 229 * person sitting at the console. This constant determines whether those
>> 230 * are used.
>> 231 *
>> 232 * DEBUG: This is the standard DEBUG flag that can be set for building
>> 233 * the kernel. It has the effect adding additional tests into
>> 234 * the code.
>> 235 *
>> 236 * FONT_6x11:
>> 237 * FONT_8x8:
>> 238 * FONT_8x16:
>> 239 * In theory these could be determined at run time or handed
>> 240 * over by the booter. But, let's be real, it's a fine hard
>> 241 * coded value. (But, you will notice the code is run-time
>> 242 * flexible!) A pointer to the font's struct font_desc
>> 243 * is kept locally in Lconsole_font. It is used to determine
>> 244 * font size information dynamically.
>> 245 *
>> 246 * Atari constants:
>> 247 * USE_PRINTER: Use the printer port for serial debug.
>> 248 * USE_SCC_B: Use the SCC port A (Serial2) for serial debug.
>> 249 * USE_SCC_A: Use the SCC port B (Modem2) for serial debug.
>> 250 * USE_MFP: Use the ST-MFP port (Modem1) for serial debug.
>> 251 *
>> 252 * Macintosh constants:
>> 253 * MAC_SERIAL_DEBUG: Turns on serial debug output for the Macintosh.
>> 254 * MAC_USE_SCC_A: Use the SCC port A (modem) for serial debug.
>> 255 * MAC_USE_SCC_B: Use the SCC port B (printer) for serial debug (default).
29 */ 256 */
30 257
31 #include <linux/init.h> <<
32 #include <linux/linkage.h> 258 #include <linux/linkage.h>
33 #include <asm/thread_info.h> !! 259 #include <linux/init.h>
>> 260 #include <asm/bootinfo.h>
>> 261 #include <asm/setup.h>
>> 262 #include <asm/entry.h>
>> 263 #include <asm/pgtable.h>
34 #include <asm/page.h> 264 #include <asm/page.h>
35 #include <linux/of_fdt.h> /* for !! 265 #include <asm/asm-offsets.h>
>> 266
>> 267 #ifdef CONFIG_MAC
>> 268
>> 269 #include <asm/machw.h>
>> 270
>> 271 /*
>> 272 * Macintosh console support
>> 273 */
>> 274
>> 275 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
>> 276 #define CONSOLE
>> 277 #define CONSOLE_PENGUIN
>> 278 #endif
>> 279
>> 280 /*
>> 281 * Macintosh serial debug support; outputs boot info to the printer
>> 282 * and/or modem serial ports
>> 283 */
>> 284 #undef MAC_SERIAL_DEBUG
>> 285
>> 286 /*
>> 287 * Macintosh serial debug port selection; define one or both;
>> 288 * requires MAC_SERIAL_DEBUG to be defined
>> 289 */
>> 290 #define MAC_USE_SCC_A /* Macintosh modem serial port */
>> 291 #define MAC_USE_SCC_B /* Macintosh printer serial port */
>> 292
>> 293 #endif /* CONFIG_MAC */
>> 294
>> 295 #undef MMU_PRINT
>> 296 #undef MMU_NOCACHE_KERNEL
>> 297 #define SERIAL_DEBUG
>> 298 #undef DEBUG
>> 299
>> 300 /*
>> 301 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
>> 302 * The 8x8 font is harder to read but fits more on the screen.
>> 303 */
>> 304 #define FONT_8x8 /* default */
>> 305 /* #define FONT_8x16 */ /* 2nd choice */
>> 306 /* #define FONT_6x11 */ /* 3rd choice */
>> 307
>> 308 .globl kernel_pg_dir
>> 309 .globl availmem
>> 310 .globl m68k_pgtable_cachemode
>> 311 .globl m68k_supervisor_cachemode
>> 312 #ifdef CONFIG_MVME16x
>> 313 .globl mvme_bdid
>> 314 #endif
>> 315 #ifdef CONFIG_Q40
>> 316 .globl q40_mem_cptr
>> 317 #endif
>> 318
>> 319 CPUTYPE_040 = 1 /* indicates an 040 */
>> 320 CPUTYPE_060 = 2 /* indicates an 060 */
>> 321 CPUTYPE_0460 = 3 /* if either above are set, this is set */
>> 322 CPUTYPE_020 = 4 /* indicates an 020 */
>> 323
>> 324 /* Translation control register */
>> 325 TC_ENABLE = 0x8000
>> 326 TC_PAGE8K = 0x4000
>> 327 TC_PAGE4K = 0x0000
>> 328
>> 329 /* Transparent translation registers */
>> 330 TTR_ENABLE = 0x8000 /* enable transparent translation */
>> 331 TTR_ANYMODE = 0x4000 /* user and kernel mode access */
>> 332 TTR_KERNELMODE = 0x2000 /* only kernel mode access */
>> 333 TTR_USERMODE = 0x0000 /* only user mode access */
>> 334 TTR_CI = 0x0400 /* inhibit cache */
>> 335 TTR_RW = 0x0200 /* read/write mode */
>> 336 TTR_RWM = 0x0100 /* read/write mask */
>> 337 TTR_FCB2 = 0x0040 /* function code base bit 2 */
>> 338 TTR_FCB1 = 0x0020 /* function code base bit 1 */
>> 339 TTR_FCB0 = 0x0010 /* function code base bit 0 */
>> 340 TTR_FCM2 = 0x0004 /* function code mask bit 2 */
>> 341 TTR_FCM1 = 0x0002 /* function code mask bit 1 */
>> 342 TTR_FCM0 = 0x0001 /* function code mask bit 0 */
>> 343
>> 344 /* Cache Control registers */
>> 345 CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */
>> 346 CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */
>> 347 CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */
>> 348 CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */
>> 349 CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */
>> 350 CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */
>> 351 CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */
>> 352 CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */
>> 353 CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */
>> 354 CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */
>> 355 CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */
>> 356 CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */
>> 357 CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */
>> 358 CC3_CLR_D = 0x00000800 /* clear data cache (68030) */
>> 359 CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */
>> 360 CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */
>> 361 CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */
>> 362 CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */
>> 363 CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */
>> 364 CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */
>> 365 CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */
>> 366 CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */
>> 367
>> 368 /* Miscellaneous definitions */
>> 369 PAGESIZE = 4096
>> 370 PAGESHIFT = 12
>> 371
>> 372 ROOT_TABLE_SIZE = 128
>> 373 PTR_TABLE_SIZE = 128
>> 374 PAGE_TABLE_SIZE = 64
>> 375 ROOT_INDEX_SHIFT = 25
>> 376 PTR_INDEX_SHIFT = 18
>> 377 PAGE_INDEX_SHIFT = 12
>> 378
>> 379 #ifdef DEBUG
>> 380 /* When debugging use readable names for labels */
>> 381 #ifdef __STDC__
>> 382 #define L(name) .head.S.##name
>> 383 #else
>> 384 #define L(name) .head.S./**/name
>> 385 #endif
>> 386 #else
>> 387 #ifdef __STDC__
>> 388 #define L(name) .L##name
>> 389 #else
>> 390 #define L(name) .L/**/name
>> 391 #endif
>> 392 #endif
36 393
37 #include <asm/setup.h> /* COMMAND_LINE_SIZE */ !! 394 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
38 #include <asm/mmu.h> !! 395 #ifndef __INITDATA
39 #include <asm/processor.h> !! 396 #define __INITDATA .data
40 !! 397 #define __FINIT .previous
41 .section .data !! 398 #endif
42 .global empty_zero_page !! 399
43 .align 12 !! 400 /* Several macros to make the writing of subroutines easier:
44 empty_zero_page: !! 401 * - func_start marks the beginning of the routine which setups the frame
45 .space PAGE_SIZE !! 402 * register and saves the registers, it also defines another macro
46 .global swapper_pg_dir !! 403 * to automatically restore the registers again.
47 swapper_pg_dir: !! 404 * - func_return marks the end of the routine and simply calls the prepared
48 .space PAGE_SIZE !! 405 * macro to restore registers and jump back to the caller.
49 !! 406 * - func_define generates another macro to automatically put arguments
50 .section .rodata !! 407 * onto the stack call the subroutine and cleanup the stack again.
51 .align 4 !! 408 */
52 endian_check: !! 409
53 .word 1 !! 410 /* Within subroutines these macros can be used to access the arguments
>> 411 * on the stack. With STACK some allocated memory on the stack can be
>> 412 * accessed and ARG0 points to the return address (used by mmu_engage).
>> 413 */
>> 414 #define STACK %a6@(stackstart)
>> 415 #define ARG0 %a6@(4)
>> 416 #define ARG1 %a6@(8)
>> 417 #define ARG2 %a6@(12)
>> 418 #define ARG3 %a6@(16)
>> 419 #define ARG4 %a6@(20)
>> 420
>> 421 .macro func_start name,saveregs,stack=0
>> 422 L(\name):
>> 423 linkw %a6,#-\stack
>> 424 moveml \saveregs,%sp@-
>> 425 .set stackstart,-\stack
>> 426
>> 427 .macro func_return_\name
>> 428 moveml %sp@+,\saveregs
>> 429 unlk %a6
>> 430 rts
>> 431 .endm
>> 432 .endm
>> 433
>> 434 .macro func_return name
>> 435 func_return_\name
>> 436 .endm
>> 437
>> 438 .macro func_call name
>> 439 jbsr L(\name)
>> 440 .endm
>> 441
>> 442 .macro move_stack nr,arg1,arg2,arg3,arg4
>> 443 .if \nr
>> 444 move_stack "(\nr-1)",\arg2,\arg3,\arg4
>> 445 movel \arg1,%sp@-
>> 446 .endif
>> 447 .endm
>> 448
>> 449 .macro func_define name,nr=0
>> 450 .macro \name arg1,arg2,arg3,arg4
>> 451 move_stack \nr,\arg1,\arg2,\arg3,\arg4
>> 452 func_call \name
>> 453 .if \nr
>> 454 lea %sp@(\nr*4),%sp
>> 455 .endif
>> 456 .endm
>> 457 .endm
>> 458
>> 459 func_define mmu_map,4
>> 460 func_define mmu_map_tt,4
>> 461 func_define mmu_fixup_page_mmu_cache,1
>> 462 func_define mmu_temp_map,2
>> 463 func_define mmu_engage
>> 464 func_define mmu_get_root_table_entry,1
>> 465 func_define mmu_get_ptr_table_entry,2
>> 466 func_define mmu_get_page_table_entry,2
>> 467 func_define mmu_print
>> 468 func_define get_new_page
>> 469 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 470 func_define set_leds
>> 471 #endif
>> 472
>> 473 .macro mmu_map_eq arg1,arg2,arg3
>> 474 mmu_map \arg1,\arg1,\arg2,\arg3
>> 475 .endm
>> 476
>> 477 .macro get_bi_record record
>> 478 pea \record
>> 479 func_call get_bi_record
>> 480 addql #4,%sp
>> 481 .endm
>> 482
>> 483 func_define serial_putc,1
>> 484 func_define console_putc,1
>> 485
>> 486 func_define console_init
>> 487 func_define console_put_stats
>> 488 func_define console_put_penguin
>> 489 func_define console_plot_pixel,3
>> 490 func_define console_scroll
>> 491
>> 492 .macro putc ch
>> 493 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 494 pea \ch
>> 495 #endif
>> 496 #ifdef CONSOLE
>> 497 func_call console_putc
>> 498 #endif
>> 499 #ifdef SERIAL_DEBUG
>> 500 func_call serial_putc
>> 501 #endif
>> 502 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 503 addql #4,%sp
>> 504 #endif
>> 505 .endm
>> 506
>> 507 .macro dputc ch
>> 508 #ifdef DEBUG
>> 509 putc \ch
>> 510 #endif
>> 511 .endm
>> 512
>> 513 func_define putn,1
>> 514
>> 515 .macro dputn nr
>> 516 #ifdef DEBUG
>> 517 putn \nr
>> 518 #endif
>> 519 .endm
>> 520
>> 521 .macro puts string
>> 522 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 523 __INITDATA
>> 524 .Lstr\@:
>> 525 .string "\string"
>> 526 __FINIT
>> 527 pea %pc@(.Lstr\@)
>> 528 func_call puts
>> 529 addql #4,%sp
>> 530 #endif
>> 531 .endm
>> 532
>> 533 .macro dputs string
>> 534 #ifdef DEBUG
>> 535 puts "\string"
>> 536 #endif
>> 537 .endm
>> 538
>> 539 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
>> 540 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
>> 541 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
>> 542 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
>> 543 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
>> 544 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
>> 545 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
>> 546 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
>> 547 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
>> 548 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
>> 549 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
>> 550 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
>> 551 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
>> 552
>> 553 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
>> 554 jeq 42f; \
>> 555 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
>> 556 jne lab ;\
>> 557 42:\
>> 558
>> 559 #define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
>> 560 #define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
>> 561 #define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
>> 562 #define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
>> 563 #define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
>> 564 #define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
>> 565 #define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
>> 566
>> 567 /* On the HP300 we use the on-board LEDs for debug output before
>> 568 the console is running. Writing a 1 bit turns the corresponding LED
>> 569 _off_ - on the 340 bit 7 is towards the back panel of the machine. */
>> 570 .macro leds mask
>> 571 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 572 hasnt_leds(.Lled\@)
>> 573 pea \mask
>> 574 func_call set_leds
>> 575 addql #4,%sp
>> 576 .Lled\@:
>> 577 #endif
>> 578 .endm
>> 579
>> 580 __HEAD
>> 581 ENTRY(_stext)
>> 582 /*
>> 583 * Version numbers of the bootinfo interface
>> 584 * The area from _stext to _start will later be used as kernel pointer table
>> 585 */
>> 586 bras 1f /* Jump over bootinfo version numbers */
>> 587
>> 588 .long BOOTINFOV_MAGIC
>> 589 .long MACH_AMIGA, AMIGA_BOOTI_VERSION
>> 590 .long MACH_ATARI, ATARI_BOOTI_VERSION
>> 591 .long MACH_MVME147, MVME147_BOOTI_VERSION
>> 592 .long MACH_MVME16x, MVME16x_BOOTI_VERSION
>> 593 .long MACH_BVME6000, BVME6000_BOOTI_VERSION
>> 594 .long MACH_MAC, MAC_BOOTI_VERSION
>> 595 .long MACH_Q40, Q40_BOOTI_VERSION
>> 596 .long MACH_HP300, HP300_BOOTI_VERSION
>> 597 .long 0
>> 598 1: jra __start
>> 599
>> 600 .equ kernel_pg_dir,_stext
>> 601
>> 602 .equ .,_stext+PAGESIZE
54 603
55 __HEAD <<
56 ENTRY(_start) 604 ENTRY(_start)
57 #if CONFIG_KERNEL_BASE_ADDR == 0 !! 605 jra __start
58 brai TOPHYS(real_start) !! 606 __INIT
59 .org 0x100 !! 607 ENTRY(__start)
60 real_start: !! 608 /*
61 #endif !! 609 * Setup initial stack pointer
62 !! 610 */
63 mts rmsr, r0 !! 611 lea %pc@(_stext),%sp
64 /* Disable stack protection from bootloader */ !! 612
65 mts rslr, r0 !! 613 /*
66 addi r8, r0, 0xFFFFFFFF !! 614 * Record the CPU and machine type.
67 mts rshr, r8 !! 615 */
68 /* !! 616 get_bi_record BI_MACHTYPE
69 * According to Xilinx, msrclr instruction beh !! 617 lea %pc@(m68k_machtype),%a1
70 * if the msrclr instruction is not enabled. W !! 618 movel %a0@,%a1@
71 * if the opcode is available, by issuing msrc !! 619
72 * r8 == 0 - msr instructions are implemented !! 620 get_bi_record BI_FPUTYPE
73 * r8 != 0 - msr instructions are not implemen !! 621 lea %pc@(m68k_fputype),%a1
74 */ !! 622 movel %a0@,%a1@
75 mfs r1, rmsr !! 623
76 msrclr r8, 0 /* clear nothing - just !! 624 get_bi_record BI_MMUTYPE
77 cmpu r8, r8, r1 /* r1 must contain !! 625 lea %pc@(m68k_mmutype),%a1
78 !! 626 movel %a0@,%a1@
79 /* r7 may point to an FDT, or there may be one !! 627
80 if it's in r7, we've got to save it away AS !! 628 get_bi_record BI_CPUTYPE
81 We ensure r7 points to a valid FDT, just in !! 629 lea %pc@(m68k_cputype),%a1
82 is broken or non-existent */ !! 630 movel %a0@,%a1@
83 beqi r7, no_fdt_arg !! 631
84 /* Does r7 point to a valid FDT? Load HEADER m !! 632 leds 0x1
85 /* Run time Big/Little endian platform !! 633
86 /* Save 1 as word and load byte - 0 - !! 634 #ifdef CONFIG_MAC
87 lbui r11, r0, TOPHYS(endian_check) !! 635 /*
88 beqid r11, big_endian /* DO NOT brea !! 636 * For Macintosh, we need to determine the display parameters early (at least
89 lw r11, r0, r7 /* Big endian load !! 637 * while debugging it).
90 lwr r11, r0, r7 /* Little endian l !! 638 */
91 big_endian: !! 639
92 rsubi r11, r11, OF_DT_HEADER /* Che !! 640 is_not_mac(L(test_notmac))
93 beqi r11, _prepare_copy_fdt !! 641
94 or r7, r0, r0 /* cle !! 642 get_bi_record BI_MAC_VADDR
95 bnei r11, no_fdt_arg !! 643 lea %pc@(L(mac_videobase)),%a1
96 _prepare_copy_fdt: !! 644 movel %a0@,%a1@
97 or r11, r0, r0 /* incremment */ !! 645
98 ori r4, r0, TOPHYS(_fdt_start) !! 646 get_bi_record BI_MAC_VDEPTH
99 ori r3, r0, (0x10000 - 4) !! 647 lea %pc@(L(mac_videodepth)),%a1
100 _copy_fdt: !! 648 movel %a0@,%a1@
101 lw r12, r7, r11 /* r12 = r7 + r11 !! 649
102 sw r12, r4, r11 /* addr[r4 + r11] !! 650 get_bi_record BI_MAC_VDIM
103 addik r11, r11, 4 /* increment count !! 651 lea %pc@(L(mac_dimensions)),%a1
104 bgtid r3, _copy_fdt /* loop for all !! 652 movel %a0@,%a1@
105 addik r3, r3, -4 /* descrement loop !! 653
106 no_fdt_arg: !! 654 get_bi_record BI_MAC_VROW
107 !! 655 lea %pc@(L(mac_rowbytes)),%a1
108 #ifndef CONFIG_CMDLINE_BOOL !! 656 movel %a0@,%a1@
109 /* !! 657
110 * handling command line !! 658 #ifdef MAC_SERIAL_DEBUG
111 * copy command line directly to cmd_line plac !! 659 get_bi_record BI_MAC_SCCBASE
112 */ !! 660 lea %pc@(L(mac_sccbase)),%a1
113 beqid r5, skip /* Skip if NUL !! 661 movel %a0@,%a1@
114 or r11, r0, r0 /* inc !! 662 #endif /* MAC_SERIAL_DEBUG */
115 ori r4, r0, cmd_line /* loa !! 663
116 tophys(r4,r4) /* con !! 664 #if 0
117 ori r3, r0, COMMAND_LINE_SIZE - 1 !! 665 /*
118 _copy_command_line: !! 666 * Clear the screen
119 /* r2=r5+r11 - r5 contain pointer to c !! 667 */
120 lbu r2, r5, r11 !! 668 lea %pc@(L(mac_videobase)),%a0
121 beqid r2, skip /* Ski !! 669 movel %a0@,%a1
122 sb r2, r4, r11 /* add !! 670 lea %pc@(L(mac_dimensions)),%a0
123 addik r11, r11, 1 /* inc !! 671 movel %a0@,%d1
124 bgtid r3, _copy_command_line /* loo !! 672 swap %d1 /* #rows is high bytes */
125 addik r3, r3, -1 /* dec !! 673 andl #0xFFFF,%d1 /* rows */
126 addik r5, r4, 0 /* add !! 674 subl #10,%d1
127 tovirt(r5,r5) !! 675 lea %pc@(L(mac_rowbytes)),%a0
128 skip: !! 676 loopy2:
129 #endif /* CONFIG_CMDLINE_BOOL */ !! 677 movel %a0@,%d0
130 !! 678 subql #1,%d0
131 #ifdef NOT_COMPILE !! 679 loopx2:
132 /* save bram context */ !! 680 moveb #0x55, %a1@+
133 or r11, r0, r0 !! 681 dbra %d0,loopx2
134 ori r4, r0, TOPHYS(_bram_load_star !! 682 dbra %d1,loopy2
135 ori r3, r0, (LMB_SIZE - 4) !! 683 #endif
136 _copy_bram: !! 684
137 lw r7, r0, r11 /* r7 !! 685 L(test_notmac):
138 sw r7, r4, r11 /* add !! 686 #endif /* CONFIG_MAC */
139 addik r11, r11, 4 /* inc !! 687
140 bgtid r3, _copy_bram /* loo !! 688
141 addik r3, r3, -4 /* des !! 689 /*
142 #endif !! 690 * There are ultimately two pieces of information we want for all kinds of
143 /* We have to turn on the MMU right aw !! 691 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter
144 !! 692 * and is converted here from a booter type definition to a separate bit
145 /* !! 693 * number which allows for the standard is_0x0 macro tests.
146 * Set up the initial MMU state so we !! 694 */
147 * kernel initialization. This maps t !! 695 movel %pc@(m68k_cputype),%d0
148 * virtual to physical. !! 696 /*
149 */ !! 697 * Assume it's an 030
150 nop !! 698 */
151 addik r3, r0, MICROBLAZE_TLB_SIZE -1 !! 699 clrl %d1
152 _invalidate: !! 700
153 mts rtlbx, r3 !! 701 /*
154 mts rtlbhi, r0 !! 702 * Test the BootInfo cputype for 060
155 mts rtlblo, r0 !! 703 */
156 bgtid r3, _invalidate /* loo !! 704 btst #CPUB_68060,%d0
157 addik r3, r3, -1 !! 705 jeq 1f
158 /* sync */ !! 706 bset #CPUTYPE_060,%d1
159 !! 707 bset #CPUTYPE_0460,%d1
160 /* Setup the kernel PID */ !! 708 jra 3f
161 mts rpid,r0 /* Loa !! 709 1:
162 nop !! 710 /*
163 bri 4 !! 711 * Test the BootInfo cputype for 040
164 !! 712 */
165 /* !! 713 btst #CPUB_68040,%d0
166 * We should still be executing code a !! 714 jeq 2f
167 * RAM_BASEADDR at this point. However !! 715 bset #CPUTYPE_040,%d1
168 * a virtual address. So, set up a TLB !! 716 bset #CPUTYPE_0460,%d1
169 * translation is enabled. !! 717 jra 3f
170 */ !! 718 2:
171 !! 719 /*
172 addik r3,r0, CONFIG_KERNEL_START /* !! 720 * Test the BootInfo cputype for 020
173 tophys(r4,r3) /* Loa !! 721 */
174 !! 722 btst #CPUB_68020,%d0
175 /* start to do TLB calculation */ !! 723 jeq 3f
176 addik r12, r0, _end !! 724 bset #CPUTYPE_020,%d1
177 rsub r12, r3, r12 !! 725 jra 3f
178 addik r12, r12, CONFIG_LOWMEM_SIZE > !! 726 3:
179 !! 727 /*
180 or r9, r0, r0 /* TLB0 = 0 */ !! 728 * Record the cpu type
181 or r10, r0, r0 /* TLB1 = 0 */ !! 729 */
182 !! 730 lea %pc@(L(cputype)),%a0
183 addik r11, r12, -0x1000000 !! 731 movel %d1,%a0@
184 bgei r11, GT16 /* size is greater t !! 732
185 addik r11, r12, -0x0800000 !! 733 /*
186 bgei r11, GT8 /* size is greater th !! 734 * NOTE:
187 addik r11, r12, -0x0400000 !! 735 *
188 bgei r11, GT4 /* size is greater th !! 736 * Now the macros are valid:
189 /* size is less than 4MB */ !! 737 * is_040_or_060
190 addik r11, r12, -0x0200000 !! 738 * is_not_040_or_060
191 bgei r11, GT2 /* size is greater th !! 739 * is_040
192 addik r9, r0, 0x0100000 /* TLB0 must !! 740 * is_060
193 addik r11, r12, -0x0100000 !! 741 * is_not_060
194 bgei r11, GT1 /* size is greater th !! 742 */
195 /* TLB1 is 0 which is setup above */ !! 743
196 bri tlb_end !! 744 /*
197 GT4: /* r11 contains the rest - will be either !! 745 * Determine the cache mode for pages holding MMU tables
198 ori r9, r0, 0x400000 /* TLB0 is 4MB */ !! 746 * and for supervisor mode, unused for '020 and '030
199 bri TLB1 !! 747 */
200 GT16: /* TLB0 is 16MB */ !! 748 clrl %d0
201 addik r9, r0, 0x1000000 /* means TLB !! 749 clrl %d1
202 TLB1: !! 750
203 /* must be used r2 because of subtract !! 751 is_not_040_or_060(L(save_cachetype))
204 addik r2, r11, -0x0400000 !! 752
205 bgei r2, GT20 /* size is greater th !! 753 /*
206 /* size is >16MB and <20MB */ !! 754 * '040 or '060
207 addik r11, r11, -0x0100000 !! 755 * d1 := cacheable write-through
208 bgei r11, GT17 /* size is greater t !! 756 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
209 /* kernel is >16MB and < 17MB */ !! 757 * but we have been using write-through since at least 2.0.29 so I
210 GT1: !! 758 * guess it is OK.
211 addik r10, r0, 0x0100000 /* means TL !! 759 */
212 bri tlb_end !! 760 #ifdef CONFIG_060_WRITETHROUGH
213 GT2: /* TLB0 is 0 and TLB1 will be 4MB */ !! 761 /*
214 GT17: /* TLB1 is 4MB - kernel size <20MB */ !! 762 * If this is a 68060 board using drivers with cache coherency
215 addik r10, r0, 0x0400000 /* means TL !! 763 * problems, then supervisor memory accesses need to be write-through
216 bri tlb_end !! 764 * also; otherwise, we want copyback.
217 GT8: /* TLB0 is still zero that's why I can us !! 765 */
218 GT20: /* TLB1 is 16MB - kernel size >20MB */ !! 766
219 addik r10, r0, 0x1000000 /* means TL !! 767 is_not_060(1f)
220 tlb_end: !! 768 movel #_PAGE_CACHE040W,%d0
221 !! 769 jra L(save_cachetype)
222 /* !! 770 #endif /* CONFIG_060_WRITETHROUGH */
223 * Configure and load two entries into !! 771 1:
224 * In case we are pinning TLBs, these !! 772 movew #_PAGE_CACHE040,%d0
225 * other TLB functions. If not reserv !! 773
226 * matter where they are loaded. !! 774 movel #_PAGE_CACHE040W,%d1
227 */ !! 775
228 andi r4,r4,0xfffffc00 /* Mas !! 776 L(save_cachetype):
229 ori r4,r4,(TLB_WR | TLB_EX) /* Set !! 777 /* Save cache mode for supervisor mode and page tables
230 !! 778 */
231 /* !! 779 lea %pc@(m68k_supervisor_cachemode),%a0
232 * TLB0 is always used - check if is n !! 780 movel %d0,%a0@
233 * if is use TLB1 value and clear it ( !! 781 lea %pc@(m68k_pgtable_cachemode),%a0
234 */ !! 782 movel %d1,%a0@
235 bnei r9, tlb0_not_zero !! 783
236 add r9, r10, r0 !! 784 /*
237 add r10, r0, r0 !! 785 * raise interrupt level
238 tlb0_not_zero: !! 786 */
239 !! 787 movew #0x2700,%sr
240 /* look at the code below */ !! 788
241 ori r30, r0, 0x200 !! 789 /*
242 andi r29, r9, 0x100000 !! 790 If running on an Atari, determine the I/O base of the
243 bneid r29, 1f !! 791 serial port and test if we are running on a Medusa or Hades.
244 addik r30, r30, 0x80 !! 792 This test is necessary here, because on the Hades the serial
245 andi r29, r9, 0x400000 !! 793 port is only accessible in the high I/O memory area.
246 bneid r29, 1f !! 794
247 addik r30, r30, 0x80 !! 795 The test whether it is a Medusa is done by writing to the byte at
248 andi r29, r9, 0x1000000 !! 796 phys. 0x0. This should result in a bus error on all other machines.
249 bneid r29, 1f !! 797
250 addik r30, r30, 0x80 !! 798 ...should, but doesn't. The Afterburner040 for the Falcon has the
251 1: !! 799 same behaviour (0x0..0x7 are no ROM shadow). So we have to do
252 andi r3,r3,0xfffffc00 /* Mas !! 800 another test to distinguish Medusa and AB040. This is a
253 ori r3,r3,(TLB_VALID) !! 801 read attempt for 0x00ff82fe phys. that should bus error on a Falcon
254 or r3, r3, r30 !! 802 (+AB040), but is in the range where the Medusa always asserts DTACK.
255 !! 803
256 /* Load tlb_skip size value which is i !! 804 The test for the Hades is done by reading address 0xb0000000. This
257 lwi r11, r0, TOPHYS(tlb_skip) !! 805 should give a bus error on the Medusa.
258 mts rtlbx,r11 /* TLB !! 806 */
259 !! 807
260 mts rtlblo,r4 /* Loa !! 808 #ifdef CONFIG_ATARI
261 mts rtlbhi,r3 /* Loa !! 809 is_not_atari(L(notypetest))
262 !! 810
263 /* Increase tlb_skip size */ !! 811 /* get special machine type (Medusa/Hades/AB40) */
264 addik r11, r11, 1 !! 812 moveq #0,%d3 /* default if tag doesn't exist */
265 swi r11, r0, TOPHYS(tlb_skip) !! 813 get_bi_record BI_ATARI_MCH_TYPE
266 !! 814 tstl %d0
267 /* TLB1 can be zeroes that's why we no !! 815 jbmi 1f
268 beqi r10, jump_over2 !! 816 movel %a0@,%d3
269 !! 817 lea %pc@(atari_mch_type),%a0
270 /* look at the code below */ !! 818 movel %d3,%a0@
271 ori r30, r0, 0x200 !! 819 1:
272 andi r29, r10, 0x100000 !! 820 /* On the Hades, the iobase must be set up before opening the
273 bneid r29, 1f !! 821 * serial port. There are no I/O regs at 0x00ffxxxx at all. */
274 addik r30, r30, 0x80 !! 822 moveq #0,%d0
275 andi r29, r10, 0x400000 !! 823 cmpl #ATARI_MACH_HADES,%d3
276 bneid r29, 1f !! 824 jbne 1f
277 addik r30, r30, 0x80 !! 825 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */
278 andi r29, r10, 0x1000000 !! 826 1: lea %pc@(L(iobase)),%a0
279 bneid r29, 1f !! 827 movel %d0,%a0@
280 addik r30, r30, 0x80 !! 828
281 1: !! 829 L(notypetest):
282 addk r4, r4, r9 /* previous ad !! 830 #endif
283 addk r3, r3, r9 !! 831
284 !! 832 #ifdef CONFIG_VME
285 andi r3,r3,0xfffffc00 /* Mas !! 833 is_mvme147(L(getvmetype))
286 ori r3,r3,(TLB_VALID) !! 834 is_bvme6000(L(getvmetype))
287 or r3, r3, r30 !! 835 is_not_mvme16x(L(gvtdone))
288 !! 836
289 lwi r11, r0, TOPHYS(tlb_skip) !! 837 /* See if the loader has specified the BI_VME_TYPE tag. Recent
290 mts rtlbx, r11 /* r11 !! 838 * versions of VMELILO and TFTPLILO do this. We have to do this
291 !! 839 * early so we know how to handle console output. If the tag
292 mts rtlblo,r4 /* Loa !! 840 * doesn't exist then we use the Bug for output on MVME16x.
293 mts rtlbhi,r3 /* Loa !! 841 */
294 !! 842 L(getvmetype):
295 /* Increase tlb_skip size */ !! 843 get_bi_record BI_VME_TYPE
296 addik r11, r11, 1 !! 844 tstl %d0
297 swi r11, r0, TOPHYS(tlb_skip) !! 845 jbmi 1f
298 !! 846 movel %a0@,%d3
299 jump_over2: !! 847 lea %pc@(vme_brdtype),%a0
300 /* !! 848 movel %d3,%a0@
301 * Load a TLB entry for LMB, since we !! 849 1:
302 * the exception vectors, using a 4k r !! 850 #ifdef CONFIG_MVME16x
303 */ !! 851 is_not_mvme16x(L(gvtdone))
304 /* Use temporary TLB_ID for LMB - clea !! 852
305 ori r11, r0, MICROBLAZE_LMB_TLB_ID !! 853 /* Need to get the BRD_ID info to differentiate between 162, 167,
306 mts rtlbx,r11 !! 854 * etc. This is available as a BI_VME_BRDINFO tag with later
307 !! 855 * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
308 ori r4,r0,(TLB_WR | TLB_EX) !! 856 */
309 ori r3,r0,(TLB_VALID | TLB_PAGESZ( !! 857 get_bi_record BI_VME_BRDINFO
310 !! 858 tstl %d0
311 mts rtlblo,r4 /* Loa !! 859 jpl 1f
312 mts rtlbhi,r3 /* Loa !! 860
313 !! 861 /* Get pointer to board ID data from Bug */
314 /* !! 862 movel %d2,%sp@-
315 * We now have the lower 16 Meg of RAM !! 863 trap #15
316 * caches ready to work. !! 864 .word 0x70 /* trap 0x70 - .BRD_ID */
317 */ !! 865 movel %sp@+,%a0
318 turn_on_mmu: !! 866 1:
319 ori r15,r0,start_here !! 867 lea %pc@(mvme_bdid),%a1
320 ori r4,r0,MSR_KERNEL_VMS !! 868 /* Structure is 32 bytes long */
321 mts rmsr,r4 !! 869 movel %a0@+,%a1@+
322 nop !! 870 movel %a0@+,%a1@+
323 rted r15,0 /* ena !! 871 movel %a0@+,%a1@+
324 nop !! 872 movel %a0@+,%a1@+
325 !! 873 movel %a0@+,%a1@+
326 start_here: !! 874 movel %a0@+,%a1@+
327 !! 875 movel %a0@+,%a1@+
328 /* Initialize small data anchors */ !! 876 movel %a0@+,%a1@+
329 addik r13, r0, _KERNEL_SDA_BASE_ !! 877 #endif
330 addik r2, r0, _KERNEL_SDA2_BASE_ !! 878
331 !! 879 L(gvtdone):
332 /* Initialize stack pointer */ !! 880
333 addik r1, r0, init_thread_union + TH !! 881 #endif
334 !! 882
335 /* Initialize r31 with current task ad !! 883 #ifdef CONFIG_HP300
336 addik r31, r0, init_task !! 884 is_not_hp300(L(nothp))
337 !! 885
338 addik r11, r0, machine_early_init !! 886 /* Get the address of the UART for serial debugging */
339 brald r15, r11 !! 887 get_bi_record BI_HP300_UART_ADDR
340 nop !! 888 tstl %d0
341 !! 889 jbmi 1f
342 /* !! 890 movel %a0@,%d3
343 * Initialize the MMU. !! 891 lea %pc@(L(uartbase)),%a0
344 */ !! 892 movel %d3,%a0@
345 bralid r15, mmu_init !! 893 get_bi_record BI_HP300_UART_SCODE
346 nop !! 894 tstl %d0
347 !! 895 jbmi 1f
348 /* Go back to running unmapped so we c !! 896 movel %a0@,%d3
349 * and change to using our exception v !! 897 lea %pc@(L(uart_scode)),%a0
350 * On the MicroBlaze, all we invalidat !! 898 movel %d3,%a0@
351 * the old 16M byte TLB mappings. !! 899 1:
352 */ !! 900 L(nothp):
353 ori r15,r0,TOPHYS(kernel_load_cont !! 901 #endif
354 ori r4,r0,MSR_KERNEL !! 902
355 mts rmsr,r4 !! 903 /*
356 nop !! 904 * Initialize serial port
357 bri 4 !! 905 */
358 rted r15,0 !! 906 jbsr L(serial_init)
359 nop !! 907
360 !! 908 /*
361 /* Load up the kernel context */ !! 909 * Initialize console
362 kernel_load_context: !! 910 */
363 ori r5, r0, MICROBLAZE_LMB_TLB_ID !! 911 #ifdef CONFIG_MAC
364 mts rtlbx,r5 !! 912 is_not_mac(L(nocon))
365 nop !! 913 #ifdef CONSOLE
366 mts rtlbhi,r0 !! 914 console_init
367 nop !! 915 #ifdef CONSOLE_PENGUIN
368 addi r15, r0, machine_halt !! 916 console_put_penguin
369 ori r17, r0, start_kernel !! 917 #endif /* CONSOLE_PENGUIN */
370 ori r4, r0, MSR_KERNEL_VMS !! 918 console_put_stats
371 mts rmsr, r4 !! 919 #endif /* CONSOLE */
>> 920 L(nocon):
>> 921 #endif /* CONFIG_MAC */
>> 922
>> 923
>> 924 putc '\n'
>> 925 putc 'A'
>> 926 leds 0x2
>> 927 dputn %pc@(L(cputype))
>> 928 dputn %pc@(m68k_supervisor_cachemode)
>> 929 dputn %pc@(m68k_pgtable_cachemode)
>> 930 dputc '\n'
>> 931
>> 932 /*
>> 933 * Save physical start address of kernel
>> 934 */
>> 935 lea %pc@(L(phys_kernel_start)),%a0
>> 936 lea %pc@(_stext),%a1
>> 937 subl #_stext,%a1
>> 938 addl #PAGE_OFFSET,%a1
>> 939 movel %a1,%a0@
>> 940
>> 941 putc 'B'
>> 942
>> 943 leds 0x4
>> 944
>> 945 /*
>> 946 * mmu_init
>> 947 *
>> 948 * This block of code does what's necessary to map in the various kinds
>> 949 * of machines for execution of Linux.
>> 950 * First map the first 4 MB of kernel code & data
>> 951 */
>> 952
>> 953 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\
>> 954 %pc@(m68k_supervisor_cachemode)
>> 955
>> 956 putc 'C'
>> 957
>> 958 #ifdef CONFIG_AMIGA
>> 959
>> 960 L(mmu_init_amiga):
>> 961
>> 962 is_not_amiga(L(mmu_init_not_amiga))
>> 963 /*
>> 964 * mmu_init_amiga
>> 965 */
>> 966
>> 967 putc 'D'
>> 968
>> 969 is_not_040_or_060(1f)
>> 970
>> 971 /*
>> 972 * 040: Map the 16Meg range physical 0x0 upto logical 0x8000.0000
>> 973 */
>> 974 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 975 /*
>> 976 * Map the Zorro III I/O space with transparent translation
>> 977 * for frame buffer memory etc.
>> 978 */
>> 979 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
>> 980
>> 981 jbra L(mmu_init_done)
>> 982
>> 983 1:
>> 984 /*
>> 985 * 030: Map the 32Meg range physical 0x0 upto logical 0x8000.0000
>> 986 */
>> 987 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 988 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
>> 989
>> 990 jbra L(mmu_init_done)
>> 991
>> 992 L(mmu_init_not_amiga):
>> 993 #endif
>> 994
>> 995 #ifdef CONFIG_ATARI
>> 996
>> 997 L(mmu_init_atari):
>> 998
>> 999 is_not_atari(L(mmu_init_not_atari))
>> 1000
>> 1001 putc 'E'
>> 1002
>> 1003 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
>> 1004 the last 16 MB of virtual address space to the first 16 MB (i.e.
>> 1005 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
>> 1006 needed. I/O ranges are marked non-cachable.
>> 1007
>> 1008 For the Medusa it is better to map the I/O region transparently
>> 1009 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
>> 1010 accessible only in the high area.
>> 1011
>> 1012 On the Hades all I/O registers are only accessible in the high
>> 1013 area.
>> 1014 */
>> 1015
>> 1016 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
>> 1017 moveq #0,%d0
>> 1018 movel %pc@(atari_mch_type),%d3
>> 1019 cmpl #ATARI_MACH_MEDUSA,%d3
>> 1020 jbeq 2f
>> 1021 cmpl #ATARI_MACH_HADES,%d3
>> 1022 jbne 1f
>> 1023 2: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
>> 1024 1: movel %d0,%d3
>> 1025
>> 1026 is_040_or_060(L(spata68040))
>> 1027
>> 1028 /* Map everything non-cacheable, though not all parts really
>> 1029 * need to disable caches (crucial only for 0xff8000..0xffffff
>> 1030 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
>> 1031 * isn't really used, except for sometimes peeking into the
>> 1032 * ROMs (mirror at phys. 0x0), so caching isn't necessary for
>> 1033 * this. */
>> 1034 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
>> 1035
>> 1036 jbra L(mmu_init_done)
>> 1037
>> 1038 L(spata68040):
>> 1039
>> 1040 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
>> 1041
>> 1042 jbra L(mmu_init_done)
>> 1043
>> 1044 L(mmu_init_not_atari):
>> 1045 #endif
>> 1046
>> 1047 #ifdef CONFIG_Q40
>> 1048 is_not_q40(L(notq40))
>> 1049 /*
>> 1050 * add transparent mapping for 0xff00 0000 - 0xffff ffff
>> 1051 * non-cached serialized etc..
>> 1052 * this includes master chip, DAC, RTC and ISA ports
>> 1053 * 0xfe000000-0xfeffffff is for screen and ROM
>> 1054 */
>> 1055
>> 1056 putc 'Q'
>> 1057
>> 1058 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
>> 1059 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1060
>> 1061 jbra L(mmu_init_done)
>> 1062
>> 1063 L(notq40):
>> 1064 #endif
>> 1065
>> 1066 #ifdef CONFIG_HP300
>> 1067 is_not_hp300(L(nothp300))
>> 1068
>> 1069 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
>> 1070 * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx).
>> 1071 * The ROM mapping is needed because the LEDs are mapped there too.
>> 1072 */
>> 1073
>> 1074 is_040(1f)
>> 1075
>> 1076 /*
>> 1077 * 030: Map the 32Meg range physical 0x0 upto logical 0xf000.0000
>> 1078 */
>> 1079 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1080
>> 1081 jbra L(mmu_init_done)
>> 1082
>> 1083 1:
>> 1084 /*
>> 1085 * 040: Map the 16Meg range physical 0x0 upto logical 0xf000.0000
>> 1086 */
>> 1087 mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 1088
>> 1089 jbra L(mmu_init_done)
>> 1090
>> 1091 L(nothp300):
>> 1092 #endif /* CONFIG_HP300 */
>> 1093
>> 1094 #ifdef CONFIG_MVME147
>> 1095
>> 1096 is_not_mvme147(L(not147))
>> 1097
>> 1098 /*
>> 1099 * On MVME147 we have already created kernel page tables for
>> 1100 * 4MB of RAM at address 0, so now need to do a transparent
>> 1101 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1102 * so we can access on-board i/o areas.
>> 1103 */
>> 1104
>> 1105 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
>> 1106
>> 1107 jbra L(mmu_init_done)
>> 1108
>> 1109 L(not147):
>> 1110 #endif /* CONFIG_MVME147 */
>> 1111
>> 1112 #ifdef CONFIG_MVME16x
>> 1113
>> 1114 is_not_mvme16x(L(not16x))
>> 1115
>> 1116 /*
>> 1117 * On MVME16x we have already created kernel page tables for
>> 1118 * 4MB of RAM at address 0, so now need to do a transparent
>> 1119 * mapping of the top of memory space. Make it 0.5GByte for now.
>> 1120 * Supervisor only access, so transparent mapping doesn't
>> 1121 * clash with User code virtual address space.
>> 1122 * this covers IO devices, PROM and SRAM. The PROM and SRAM
>> 1123 * mapping is needed to allow 167Bug to run.
>> 1124 * IO is in the range 0xfff00000 to 0xfffeffff.
>> 1125 * PROM is 0xff800000->0xffbfffff and SRAM is
>> 1126 * 0xffe00000->0xffe1ffff.
>> 1127 */
>> 1128
>> 1129 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1130
>> 1131 jbra L(mmu_init_done)
>> 1132
>> 1133 L(not16x):
>> 1134 #endif /* CONFIG_MVME162 | CONFIG_MVME167 */
>> 1135
>> 1136 #ifdef CONFIG_BVME6000
>> 1137
>> 1138 is_not_bvme6000(L(not6000))
>> 1139
>> 1140 /*
>> 1141 * On BVME6000 we have already created kernel page tables for
>> 1142 * 4MB of RAM at address 0, so now need to do a transparent
>> 1143 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1144 * so we can access on-board i/o areas.
>> 1145 * Supervisor only access, so transparent mapping doesn't
>> 1146 * clash with User code virtual address space.
>> 1147 */
>> 1148
>> 1149 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1150
>> 1151 jbra L(mmu_init_done)
>> 1152
>> 1153 L(not6000):
>> 1154 #endif /* CONFIG_BVME6000 */
>> 1155
>> 1156 /*
>> 1157 * mmu_init_mac
>> 1158 *
>> 1159 * The Macintosh mappings are less clear.
>> 1160 *
>> 1161 * Even as of this writing, it is unclear how the
>> 1162 * Macintosh mappings will be done. However, as
>> 1163 * the first author of this code I'm proposing the
>> 1164 * following model:
>> 1165 *
>> 1166 * Map the kernel (that's already done),
>> 1167 * Map the I/O (on most machines that's the
>> 1168 * 0x5000.0000 ... 0x5300.0000 range,
>> 1169 * Map the video frame buffer using as few pages
>> 1170 * as absolutely (this requirement mostly stems from
>> 1171 * the fact that when the frame buffer is at
>> 1172 * 0x0000.0000 then we know there is valid RAM just
>> 1173 * above the screen that we don't want to waste!).
>> 1174 *
>> 1175 * By the way, if the frame buffer is at 0x0000.0000
>> 1176 * then the Macintosh is known as an RBV based Mac.
>> 1177 *
>> 1178 * By the way 2, the code currently maps in a bunch of
>> 1179 * regions. But I'd like to cut that out. (And move most
>> 1180 * of the mappings up into the kernel proper ... or only
>> 1181 * map what's necessary.)
>> 1182 */
>> 1183
>> 1184 #ifdef CONFIG_MAC
>> 1185
>> 1186 L(mmu_init_mac):
>> 1187
>> 1188 is_not_mac(L(mmu_init_not_mac))
>> 1189
>> 1190 putc 'F'
>> 1191
>> 1192 is_not_040_or_060(1f)
>> 1193
>> 1194 moveq #_PAGE_NOCACHE_S,%d3
>> 1195 jbra 2f
>> 1196 1:
>> 1197 moveq #_PAGE_NOCACHE030,%d3
>> 1198 2:
>> 1199 /*
>> 1200 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
>> 1201 * we simply map the 4MB that contains the videomem
>> 1202 */
>> 1203
>> 1204 movel #VIDEOMEMMASK,%d0
>> 1205 andl %pc@(L(mac_videobase)),%d0
>> 1206
>> 1207 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
>> 1208 /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */
>> 1209 mmu_map_eq #0x40000000,#0x02000000,%d3
>> 1210 /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
>> 1211 mmu_map_eq #0x50000000,#0x03000000,%d3
>> 1212 /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
>> 1213 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3
>> 1214
>> 1215 jbra L(mmu_init_done)
>> 1216
>> 1217 L(mmu_init_not_mac):
>> 1218 #endif
>> 1219
>> 1220 #ifdef CONFIG_SUN3X
>> 1221 is_not_sun3x(L(notsun3x))
>> 1222
>> 1223 /* oh, the pain.. We're gonna want the prom code after
>> 1224 * starting the MMU, so we copy the mappings, translating
>> 1225 * from 8k -> 4k pages as we go.
>> 1226 */
>> 1227
>> 1228 /* copy maps from 0xfee00000 to 0xff000000 */
>> 1229 movel #0xfee00000, %d0
>> 1230 moveq #ROOT_INDEX_SHIFT, %d1
>> 1231 lsrl %d1,%d0
>> 1232 mmu_get_root_table_entry %d0
>> 1233
>> 1234 movel #0xfee00000, %d0
>> 1235 moveq #PTR_INDEX_SHIFT, %d1
>> 1236 lsrl %d1,%d0
>> 1237 andl #PTR_TABLE_SIZE-1, %d0
>> 1238 mmu_get_ptr_table_entry %a0,%d0
>> 1239
>> 1240 movel #0xfee00000, %d0
>> 1241 moveq #PAGE_INDEX_SHIFT, %d1
>> 1242 lsrl %d1,%d0
>> 1243 andl #PAGE_TABLE_SIZE-1, %d0
>> 1244 mmu_get_page_table_entry %a0,%d0
>> 1245
>> 1246 /* this is where the prom page table lives */
>> 1247 movel 0xfefe00d4, %a1
>> 1248 movel %a1@, %a1
>> 1249
>> 1250 movel #((0x200000 >> 13)-1), %d1
>> 1251
>> 1252 1:
>> 1253 movel %a1@+, %d3
>> 1254 movel %d3,%a0@+
>> 1255 addl #0x1000,%d3
>> 1256 movel %d3,%a0@+
>> 1257
>> 1258 dbra %d1,1b
>> 1259
>> 1260 /* setup tt1 for I/O */
>> 1261 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
>> 1262 jbra L(mmu_init_done)
>> 1263
>> 1264 L(notsun3x):
>> 1265 #endif
>> 1266
>> 1267 #ifdef CONFIG_APOLLO
>> 1268 is_not_apollo(L(notapollo))
>> 1269
>> 1270 putc 'P'
>> 1271 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1272
>> 1273 L(notapollo):
>> 1274 jbra L(mmu_init_done)
>> 1275 #endif
>> 1276
>> 1277 L(mmu_init_done):
>> 1278
>> 1279 putc 'G'
>> 1280 leds 0x8
>> 1281
>> 1282 /*
>> 1283 * mmu_fixup
>> 1284 *
>> 1285 * On the 040 class machines, all pages that are used for the
>> 1286 * mmu have to be fixed up. According to Motorola, pages holding mmu
>> 1287 * tables should be non-cacheable on a '040 and write-through on a
>> 1288 * '060. But analysis of the reasons for this, and practical
>> 1289 * experience, showed that write-through also works on a '040.
>> 1290 *
>> 1291 * Allocated memory so far goes from kernel_end to memory_start that
>> 1292 * is used for all kind of tables, for that the cache attributes
>> 1293 * are now fixed.
>> 1294 */
>> 1295 L(mmu_fixup):
>> 1296
>> 1297 is_not_040_or_060(L(mmu_fixup_done))
>> 1298
>> 1299 #ifdef MMU_NOCACHE_KERNEL
>> 1300 jbra L(mmu_fixup_done)
>> 1301 #endif
>> 1302
>> 1303 /* first fix the page at the start of the kernel, that
>> 1304 * contains also kernel_pg_dir.
>> 1305 */
>> 1306 movel %pc@(L(phys_kernel_start)),%d0
>> 1307 subl #PAGE_OFFSET,%d0
>> 1308 lea %pc@(_stext),%a0
>> 1309 subl %d0,%a0
>> 1310 mmu_fixup_page_mmu_cache %a0
>> 1311
>> 1312 movel %pc@(L(kernel_end)),%a0
>> 1313 subl %d0,%a0
>> 1314 movel %pc@(L(memory_start)),%a1
>> 1315 subl %d0,%a1
>> 1316 bra 2f
>> 1317 1:
>> 1318 mmu_fixup_page_mmu_cache %a0
>> 1319 addw #PAGESIZE,%a0
>> 1320 2:
>> 1321 cmpl %a0,%a1
>> 1322 jgt 1b
>> 1323
>> 1324 L(mmu_fixup_done):
>> 1325
>> 1326 #ifdef MMU_PRINT
>> 1327 mmu_print
>> 1328 #endif
>> 1329
>> 1330 /*
>> 1331 * mmu_engage
>> 1332 *
>> 1333 * This chunk of code performs the gruesome task of engaging the MMU.
>> 1334 * The reason its gruesome is because when the MMU becomes engaged it
>> 1335 * maps logical addresses to physical addresses. The Program Counter
>> 1336 * register is then passed through the MMU before the next instruction
>> 1337 * is fetched (the instruction following the engage MMU instruction).
>> 1338 * This may mean one of two things:
>> 1339 * 1. The Program Counter falls within the logical address space of
>> 1340 * the kernel of which there are two sub-possibilities:
>> 1341 * A. The PC maps to the correct instruction (logical PC == physical
>> 1342 * code location), or
>> 1343 * B. The PC does not map through and the processor will read some
>> 1344 * data (or instruction) which is not the logically next instr.
>> 1345 * As you can imagine, A is good and B is bad.
>> 1346 * Alternatively,
>> 1347 * 2. The Program Counter does not map through the MMU. The processor
>> 1348 * will take a Bus Error.
>> 1349 * Clearly, 2 is bad.
>> 1350 * It doesn't take a wiz kid to figure you want 1.A.
>> 1351 * This code creates that possibility.
>> 1352 * There are two possible 1.A. states (we now ignore the other above states):
>> 1353 * A. The kernel is located at physical memory addressed the same as
>> 1354 * the logical memory for the kernel, i.e., 0x01000.
>> 1355 * B. The kernel is located some where else. e.g., 0x0400.0000
>> 1356 *
>> 1357 * Under some conditions the Macintosh can look like A or B.
>> 1358 * [A friend and I once noted that Apple hardware engineers should be
>> 1359 * wacked twice each day: once when they show up at work (as in, Whack!,
>> 1360 * "This is for the screwy hardware we know you're going to design today."),
>> 1361 * and also at the end of the day (as in, Whack! "I don't know what
>> 1362 * you designed today, but I'm sure it wasn't good."). -- rst]
>> 1363 *
>> 1364 * This code works on the following premise:
>> 1365 * If the kernel start (%d5) is within the first 16 Meg of RAM,
>> 1366 * then create a mapping for the kernel at logical 0x8000.0000 to
>> 1367 * the physical location of the pc. And, create a transparent
>> 1368 * translation register for the first 16 Meg. Then, after the MMU
>> 1369 * is engaged, the PC can be moved up into the 0x8000.0000 range
>> 1370 * and then the transparent translation can be turned off and then
>> 1371 * the PC can jump to the correct logical location and it will be
>> 1372 * home (finally). This is essentially the code that the Amiga used
>> 1373 * to use. Now, it's generalized for all processors. Which means
>> 1374 * that a fresh (but temporary) mapping has to be created. The mapping
>> 1375 * is made in page 0 (an as of yet unused location -- except for the
>> 1376 * stack!). This temporary mapping will only require 1 pointer table
>> 1377 * and a single page table (it can map 256K).
>> 1378 *
>> 1379 * OK, alternatively, imagine that the Program Counter is not within
>> 1380 * the first 16 Meg. Then, just use Transparent Translation registers
>> 1381 * to do the right thing.
>> 1382 *
>> 1383 * Last, if _start is already at 0x01000, then there's nothing special
>> 1384 * to do (in other words, in a degenerate case of the first case above,
>> 1385 * do nothing).
>> 1386 *
>> 1387 * Let's do it.
>> 1388 *
>> 1389 *
>> 1390 */
>> 1391
>> 1392 putc 'H'
>> 1393
>> 1394 mmu_engage
>> 1395
>> 1396 /*
>> 1397 * After this point no new memory is allocated and
>> 1398 * the start of available memory is stored in availmem.
>> 1399 * (The bootmem allocator requires now the physicall address.)
>> 1400 */
>> 1401
>> 1402 movel L(memory_start),availmem
>> 1403
>> 1404 #ifdef CONFIG_AMIGA
>> 1405 is_not_amiga(1f)
>> 1406 /* fixup the Amiga custom register location before printing */
>> 1407 clrl L(custom)
>> 1408 1:
>> 1409 #endif
>> 1410
>> 1411 #ifdef CONFIG_ATARI
>> 1412 is_not_atari(1f)
>> 1413 /* fixup the Atari iobase register location before printing */
>> 1414 movel #0xff000000,L(iobase)
>> 1415 1:
>> 1416 #endif
>> 1417
>> 1418 #ifdef CONFIG_MAC
>> 1419 is_not_mac(1f)
>> 1420 movel #~VIDEOMEMMASK,%d0
>> 1421 andl L(mac_videobase),%d0
>> 1422 addl #VIDEOMEMBASE,%d0
>> 1423 movel %d0,L(mac_videobase)
>> 1424 #if defined(CONSOLE)
>> 1425 movel %pc@(L(phys_kernel_start)),%d0
>> 1426 subl #PAGE_OFFSET,%d0
>> 1427 subl %d0,L(console_font)
>> 1428 subl %d0,L(console_font_data)
>> 1429 #endif
>> 1430 #ifdef MAC_SERIAL_DEBUG
>> 1431 orl #0x50000000,L(mac_sccbase)
>> 1432 #endif
>> 1433 1:
>> 1434 #endif
>> 1435
>> 1436 #ifdef CONFIG_HP300
>> 1437 is_not_hp300(2f)
>> 1438 /*
>> 1439 * Fix up the iobase register to point to the new location of the LEDs.
>> 1440 */
>> 1441 movel #0xf0000000,L(iobase)
>> 1442
>> 1443 /*
>> 1444 * Energise the FPU and caches.
>> 1445 */
>> 1446 is_040(1f)
>> 1447 movel #0x60,0xf05f400c
>> 1448 jbra 2f
>> 1449
>> 1450 /*
>> 1451 * 040: slightly different, apparently.
>> 1452 */
>> 1453 1: movew #0,0xf05f400e
>> 1454 movew #0x64,0xf05f400e
>> 1455 2:
>> 1456 #endif
>> 1457
>> 1458 #ifdef CONFIG_SUN3X
>> 1459 is_not_sun3x(1f)
>> 1460
>> 1461 /* enable copro */
>> 1462 oriw #0x4000,0x61000000
>> 1463 1:
>> 1464 #endif
>> 1465
>> 1466 #ifdef CONFIG_APOLLO
>> 1467 is_not_apollo(1f)
>> 1468
>> 1469 /*
>> 1470 * Fix up the iobase before printing
>> 1471 */
>> 1472 movel #0x80000000,L(iobase)
>> 1473 1:
>> 1474 #endif
>> 1475
>> 1476 putc 'I'
>> 1477 leds 0x10
>> 1478
>> 1479 /*
>> 1480 * Enable caches
>> 1481 */
>> 1482
>> 1483 is_not_040_or_060(L(cache_not_680460))
>> 1484
>> 1485 L(cache680460):
>> 1486 .chip 68040
372 nop 1487 nop
373 rted r17, 0 /* enable MMU !! 1488 cpusha %bc
374 nop 1489 nop
>> 1490
>> 1491 is_060(L(cache68060))
>> 1492
>> 1493 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0
>> 1494 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1495 movec %d0,%cacr
>> 1496 jra L(cache_done)
>> 1497
>> 1498 L(cache68060):
>> 1499 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
>> 1500 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1501 movec %d0,%cacr
>> 1502 /* enable superscalar dispatch in PCR */
>> 1503 moveq #1,%d0
>> 1504 .chip 68060
>> 1505 movec %d0,%pcr
>> 1506
>> 1507 jbra L(cache_done)
>> 1508 L(cache_not_680460):
>> 1509 L(cache68030):
>> 1510 .chip 68030
>> 1511 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
>> 1512 movec %d0,%cacr
>> 1513
>> 1514 jra L(cache_done)
>> 1515 .chip 68k
>> 1516 L(cache_done):
>> 1517
>> 1518 putc 'J'
>> 1519
>> 1520 /*
>> 1521 * Setup initial stack pointer
>> 1522 */
>> 1523 lea init_task,%curptr
>> 1524 lea init_thread_union+THREAD_SIZE,%sp
>> 1525
>> 1526 putc 'K'
>> 1527
>> 1528 subl %a6,%a6 /* clear a6 for gdb */
>> 1529
>> 1530 /*
>> 1531 * The new 64bit printf support requires an early exception initialization.
>> 1532 */
>> 1533 jbsr base_trap_init
>> 1534
>> 1535 /* jump to the kernel start */
>> 1536
>> 1537 putc '\n'
>> 1538 leds 0x55
>> 1539
>> 1540 jbsr start_kernel
>> 1541
>> 1542 /*
>> 1543 * Find a tag record in the bootinfo structure
>> 1544 * The bootinfo structure is located right after the kernel bss
>> 1545 * Returns: d0: size (-1 if not found)
>> 1546 * a0: data pointer (end-of-records if not found)
>> 1547 */
>> 1548 func_start get_bi_record,%d1
>> 1549
>> 1550 movel ARG1,%d0
>> 1551 lea %pc@(_end),%a0
>> 1552 1: tstw %a0@(BIR_TAG)
>> 1553 jeq 3f
>> 1554 cmpw %a0@(BIR_TAG),%d0
>> 1555 jeq 2f
>> 1556 addw %a0@(BIR_SIZE),%a0
>> 1557 jra 1b
>> 1558 2: moveq #0,%d0
>> 1559 movew %a0@(BIR_SIZE),%d0
>> 1560 lea %a0@(BIR_DATA),%a0
>> 1561 jra 4f
>> 1562 3: moveq #-1,%d0
>> 1563 lea %a0@(BIR_SIZE),%a0
>> 1564 4:
>> 1565 func_return get_bi_record
>> 1566
>> 1567
>> 1568 /*
>> 1569 * MMU Initialization Begins Here
>> 1570 *
>> 1571 * The structure of the MMU tables on the 68k machines
>> 1572 * is thus:
>> 1573 * Root Table
>> 1574 * Logical addresses are translated through
>> 1575 * a hierarchical translation mechanism where the high-order
>> 1576 * seven bits of the logical address (LA) are used as an
>> 1577 * index into the "root table." Each entry in the root
>> 1578 * table has a bit which specifies if it's a valid pointer to a
>> 1579 * pointer table. Each entry defines a 32KMeg range of memory.
>> 1580 * If an entry is invalid then that logical range of 32M is
>> 1581 * invalid and references to that range of memory (when the MMU
>> 1582 * is enabled) will fault. If the entry is valid, then it does
>> 1583 * one of two things. On 040/060 class machines, it points to
>> 1584 * a pointer table which then describes more finely the memory
>> 1585 * within that 32M range. On 020/030 class machines, a technique
>> 1586 * called "early terminating descriptors" are used. This technique
>> 1587 * allows an entire 32Meg to be described by a single entry in the
>> 1588 * root table. Thus, this entry in the root table, contains the
>> 1589 * physical address of the memory or I/O at the logical address
>> 1590 * which the entry represents and it also contains the necessary
>> 1591 * cache bits for this region.
>> 1592 *
>> 1593 * Pointer Tables
>> 1594 * Per the Root Table, there will be one or more
>> 1595 * pointer tables. Each pointer table defines a 32M range.
>> 1596 * Not all of the 32M range need be defined. Again, the next
>> 1597 * seven bits of the logical address are used an index into
>> 1598 * the pointer table to point to page tables (if the pointer
>> 1599 * is valid). There will undoubtedly be more than one
>> 1600 * pointer table for the kernel because each pointer table
>> 1601 * defines a range of only 32M. Valid pointer table entries
>> 1602 * point to page tables, or are early terminating entries
>> 1603 * themselves.
>> 1604 *
>> 1605 * Page Tables
>> 1606 * Per the Pointer Tables, each page table entry points
>> 1607 * to the physical page in memory that supports the logical
>> 1608 * address that translates to the particular index.
>> 1609 *
>> 1610 * In short, the Logical Address gets translated as follows:
>> 1611 * bits 31..26 - index into the Root Table
>> 1612 * bits 25..18 - index into the Pointer Table
>> 1613 * bits 17..12 - index into the Page Table
>> 1614 * bits 11..0 - offset into a particular 4K page
>> 1615 *
>> 1616 * The algorithms which follows do one thing: they abstract
>> 1617 * the MMU hardware. For example, there are three kinds of
>> 1618 * cache settings that are relevant. Either, memory is
>> 1619 * being mapped in which case it is either Kernel Code (or
>> 1620 * the RamDisk) or it is MMU data. On the 030, the MMU data
>> 1621 * option also describes the kernel. Or, I/O is being mapped
>> 1622 * in which case it has its own kind of cache bits. There
>> 1623 * are constants which abstract these notions from the code that
>> 1624 * actually makes the call to map some range of memory.
>> 1625 *
>> 1626 *
>> 1627 *
>> 1628 */
>> 1629
>> 1630 #ifdef MMU_PRINT
>> 1631 /*
>> 1632 * mmu_print
>> 1633 *
>> 1634 * This algorithm will print out the current MMU mappings.
>> 1635 *
>> 1636 * Input:
>> 1637 * %a5 points to the root table. Everything else is calculated
>> 1638 * from this.
>> 1639 */
>> 1640
>> 1641 #define mmu_next_valid 0
>> 1642 #define mmu_start_logical 4
>> 1643 #define mmu_next_logical 8
>> 1644 #define mmu_start_physical 12
>> 1645 #define mmu_next_physical 16
>> 1646
>> 1647 #define MMU_PRINT_INVALID -1
>> 1648 #define MMU_PRINT_VALID 1
>> 1649 #define MMU_PRINT_UNINITED 0
>> 1650
>> 1651 #define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2:
>> 1652
>> 1653 func_start mmu_print,%a0-%a6/%d0-%d7
>> 1654
>> 1655 movel %pc@(L(kernel_pgdir_ptr)),%a5
>> 1656 lea %pc@(L(mmu_print_data)),%a0
>> 1657 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
>> 1658
>> 1659 is_not_040_or_060(mmu_030_print)
>> 1660
>> 1661 mmu_040_print:
>> 1662 puts "\nMMU040\n"
>> 1663 puts "rp:"
>> 1664 putn %a5
>> 1665 putc '\n'
>> 1666 #if 0
>> 1667 /*
>> 1668 * The following #if/#endif block is a tight algorithm for dumping the 040
>> 1669 * MMU Map in gory detail. It really isn't that practical unless the
>> 1670 * MMU Map algorithm appears to go awry and you need to debug it at the
>> 1671 * entry per entry level.
>> 1672 */
>> 1673 movel #ROOT_TABLE_SIZE,%d5
>> 1674 #if 0
>> 1675 movel %a5@+,%d7 | Burn an entry to skip the kernel mappings,
>> 1676 subql #1,%d5 | they (might) work
>> 1677 #endif
>> 1678 1: tstl %d5
>> 1679 jbeq mmu_print_done
>> 1680 subq #1,%d5
>> 1681 movel %a5@+,%d7
>> 1682 btst #1,%d7
>> 1683 jbeq 1b
>> 1684
>> 1685 2: putn %d7
>> 1686 andil #0xFFFFFE00,%d7
>> 1687 movel %d7,%a4
>> 1688 movel #PTR_TABLE_SIZE,%d4
>> 1689 putc ' '
>> 1690 3: tstl %d4
>> 1691 jbeq 11f
>> 1692 subq #1,%d4
>> 1693 movel %a4@+,%d7
>> 1694 btst #1,%d7
>> 1695 jbeq 3b
>> 1696
>> 1697 4: putn %d7
>> 1698 andil #0xFFFFFF00,%d7
>> 1699 movel %d7,%a3
>> 1700 movel #PAGE_TABLE_SIZE,%d3
>> 1701 5: movel #8,%d2
>> 1702 6: tstl %d3
>> 1703 jbeq 31f
>> 1704 subq #1,%d3
>> 1705 movel %a3@+,%d6
>> 1706 btst #0,%d6
>> 1707 jbeq 6b
>> 1708 7: tstl %d2
>> 1709 jbeq 8f
>> 1710 subq #1,%d2
>> 1711 putc ' '
>> 1712 jbra 91f
>> 1713 8: putc '\n'
>> 1714 movel #8+1+8+1+1,%d2
>> 1715 9: putc ' '
>> 1716 dbra %d2,9b
>> 1717 movel #7,%d2
>> 1718 91: putn %d6
>> 1719 jbra 6b
>> 1720
>> 1721 31: putc '\n'
>> 1722 movel #8+1,%d2
>> 1723 32: putc ' '
>> 1724 dbra %d2,32b
>> 1725 jbra 3b
>> 1726
>> 1727 11: putc '\n'
>> 1728 jbra 1b
>> 1729 #endif /* MMU 040 Dumping code that's gory and detailed */
>> 1730
>> 1731 lea %pc@(kernel_pg_dir),%a5
>> 1732 movel %a5,%a0 /* a0 has the address of the root table ptr */
>> 1733 movel #0x00000000,%a4 /* logical address */
>> 1734 moveql #0,%d0
>> 1735 40:
>> 1736 /* Increment the logical address and preserve in d5 */
>> 1737 movel %a4,%d5
>> 1738 addil #PAGESIZE<<13,%d5
>> 1739 movel %a0@+,%d6
>> 1740 btst #1,%d6
>> 1741 jbne 41f
>> 1742 jbsr mmu_print_tuple_invalidate
>> 1743 jbra 48f
>> 1744 41:
>> 1745 movel #0,%d1
>> 1746 andil #0xfffffe00,%d6
>> 1747 movel %d6,%a1
>> 1748 42:
>> 1749 movel %a4,%d5
>> 1750 addil #PAGESIZE<<6,%d5
>> 1751 movel %a1@+,%d6
>> 1752 btst #1,%d6
>> 1753 jbne 43f
>> 1754 jbsr mmu_print_tuple_invalidate
>> 1755 jbra 47f
>> 1756 43:
>> 1757 movel #0,%d2
>> 1758 andil #0xffffff00,%d6
>> 1759 movel %d6,%a2
>> 1760 44:
>> 1761 movel %a4,%d5
>> 1762 addil #PAGESIZE,%d5
>> 1763 movel %a2@+,%d6
>> 1764 btst #0,%d6
>> 1765 jbne 45f
>> 1766 jbsr mmu_print_tuple_invalidate
>> 1767 jbra 46f
>> 1768 45:
>> 1769 moveml %d0-%d1,%sp@-
>> 1770 movel %a4,%d0
>> 1771 movel %d6,%d1
>> 1772 andil #0xfffff4e0,%d1
>> 1773 lea %pc@(mmu_040_print_flags),%a6
>> 1774 jbsr mmu_print_tuple
>> 1775 moveml %sp@+,%d0-%d1
>> 1776 46:
>> 1777 movel %d5,%a4
>> 1778 addq #1,%d2
>> 1779 cmpib #64,%d2
>> 1780 jbne 44b
>> 1781 47:
>> 1782 movel %d5,%a4
>> 1783 addq #1,%d1
>> 1784 cmpib #128,%d1
>> 1785 jbne 42b
>> 1786 48:
>> 1787 movel %d5,%a4 /* move to the next logical address */
>> 1788 addq #1,%d0
>> 1789 cmpib #128,%d0
>> 1790 jbne 40b
>> 1791
>> 1792 .chip 68040
>> 1793 movec %dtt1,%d0
>> 1794 movel %d0,%d1
>> 1795 andiw #0x8000,%d1 /* is it valid ? */
>> 1796 jbeq 1f /* No, bail out */
>> 1797
>> 1798 movel %d0,%d1
>> 1799 andil #0xff000000,%d1 /* Get the address */
>> 1800 putn %d1
>> 1801 puts "=="
>> 1802 putn %d1
>> 1803
>> 1804 movel %d0,%d6
>> 1805 jbsr mmu_040_print_flags_tt
>> 1806 1:
>> 1807 movec %dtt0,%d0
>> 1808 movel %d0,%d1
>> 1809 andiw #0x8000,%d1 /* is it valid ? */
>> 1810 jbeq 1f /* No, bail out */
>> 1811
>> 1812 movel %d0,%d1
>> 1813 andil #0xff000000,%d1 /* Get the address */
>> 1814 putn %d1
>> 1815 puts "=="
>> 1816 putn %d1
>> 1817
>> 1818 movel %d0,%d6
>> 1819 jbsr mmu_040_print_flags_tt
>> 1820 1:
>> 1821 .chip 68k
>> 1822
>> 1823 jbra mmu_print_done
>> 1824
>> 1825 mmu_040_print_flags:
>> 1826 btstl #10,%d6
>> 1827 putZc(' ','G') /* global bit */
>> 1828 btstl #7,%d6
>> 1829 putZc(' ','S') /* supervisor bit */
>> 1830 mmu_040_print_flags_tt:
>> 1831 btstl #6,%d6
>> 1832 jbne 3f
>> 1833 putc 'C'
>> 1834 btstl #5,%d6
>> 1835 putZc('w','c') /* write through or copy-back */
>> 1836 jbra 4f
>> 1837 3:
>> 1838 putc 'N'
>> 1839 btstl #5,%d6
>> 1840 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */
>> 1841 4:
>> 1842 rts
>> 1843
>> 1844 mmu_030_print_flags:
>> 1845 btstl #6,%d6
>> 1846 putZc('C','I') /* write through or copy-back */
>> 1847 rts
>> 1848
>> 1849 mmu_030_print:
>> 1850 puts "\nMMU030\n"
>> 1851 puts "\nrp:"
>> 1852 putn %a5
>> 1853 putc '\n'
>> 1854 movel %a5,%d0
>> 1855 andil #0xfffffff0,%d0
>> 1856 movel %d0,%a0
>> 1857 movel #0x00000000,%a4 /* logical address */
>> 1858 movel #0,%d0
>> 1859 30:
>> 1860 movel %a4,%d5
>> 1861 addil #PAGESIZE<<13,%d5
>> 1862 movel %a0@+,%d6
>> 1863 btst #1,%d6 /* is it a table ptr? */
>> 1864 jbne 31f /* yes */
>> 1865 btst #0,%d6 /* is it early terminating? */
>> 1866 jbeq 1f /* no */
>> 1867 jbsr mmu_030_print_helper
>> 1868 jbra 38f
>> 1869 1:
>> 1870 jbsr mmu_print_tuple_invalidate
>> 1871 jbra 38f
>> 1872 31:
>> 1873 movel #0,%d1
>> 1874 andil #0xfffffff0,%d6
>> 1875 movel %d6,%a1
>> 1876 32:
>> 1877 movel %a4,%d5
>> 1878 addil #PAGESIZE<<6,%d5
>> 1879 movel %a1@+,%d6
>> 1880 btst #1,%d6 /* is it a table ptr? */
>> 1881 jbne 33f /* yes */
>> 1882 btst #0,%d6 /* is it a page descriptor? */
>> 1883 jbeq 1f /* no */
>> 1884 jbsr mmu_030_print_helper
>> 1885 jbra 37f
>> 1886 1:
>> 1887 jbsr mmu_print_tuple_invalidate
>> 1888 jbra 37f
>> 1889 33:
>> 1890 movel #0,%d2
>> 1891 andil #0xfffffff0,%d6
>> 1892 movel %d6,%a2
>> 1893 34:
>> 1894 movel %a4,%d5
>> 1895 addil #PAGESIZE,%d5
>> 1896 movel %a2@+,%d6
>> 1897 btst #0,%d6
>> 1898 jbne 35f
>> 1899 jbsr mmu_print_tuple_invalidate
>> 1900 jbra 36f
>> 1901 35:
>> 1902 jbsr mmu_030_print_helper
>> 1903 36:
>> 1904 movel %d5,%a4
>> 1905 addq #1,%d2
>> 1906 cmpib #64,%d2
>> 1907 jbne 34b
>> 1908 37:
>> 1909 movel %d5,%a4
>> 1910 addq #1,%d1
>> 1911 cmpib #128,%d1
>> 1912 jbne 32b
>> 1913 38:
>> 1914 movel %d5,%a4 /* move to the next logical address */
>> 1915 addq #1,%d0
>> 1916 cmpib #128,%d0
>> 1917 jbne 30b
>> 1918
>> 1919 mmu_print_done:
>> 1920 puts "\n\n"
>> 1921
>> 1922 func_return mmu_print
>> 1923
>> 1924
>> 1925 mmu_030_print_helper:
>> 1926 moveml %d0-%d1,%sp@-
>> 1927 movel %a4,%d0
>> 1928 movel %d6,%d1
>> 1929 lea %pc@(mmu_030_print_flags),%a6
>> 1930 jbsr mmu_print_tuple
>> 1931 moveml %sp@+,%d0-%d1
>> 1932 rts
>> 1933
>> 1934 mmu_print_tuple_invalidate:
>> 1935 moveml %a0/%d7,%sp@-
>> 1936
>> 1937 lea %pc@(L(mmu_print_data)),%a0
>> 1938 tstl %a0@(mmu_next_valid)
>> 1939 jbmi mmu_print_tuple_invalidate_exit
>> 1940
>> 1941 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
>> 1942
>> 1943 putn %a4
>> 1944
>> 1945 puts "##\n"
>> 1946
>> 1947 mmu_print_tuple_invalidate_exit:
>> 1948 moveml %sp@+,%a0/%d7
>> 1949 rts
>> 1950
>> 1951
>> 1952 mmu_print_tuple:
>> 1953 moveml %d0-%d7/%a0,%sp@-
>> 1954
>> 1955 lea %pc@(L(mmu_print_data)),%a0
>> 1956
>> 1957 tstl %a0@(mmu_next_valid)
>> 1958 jble mmu_print_tuple_print
>> 1959
>> 1960 cmpl %a0@(mmu_next_physical),%d1
>> 1961 jbeq mmu_print_tuple_increment
>> 1962
>> 1963 mmu_print_tuple_print:
>> 1964 putn %d0
>> 1965 puts "->"
>> 1966 putn %d1
>> 1967
>> 1968 movel %d1,%d6
>> 1969 jbsr %a6@
>> 1970
>> 1971 mmu_print_tuple_record:
>> 1972 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid)
>> 1973
>> 1974 movel %d1,%a0@(mmu_next_physical)
>> 1975
>> 1976 mmu_print_tuple_increment:
>> 1977 movel %d5,%d7
>> 1978 subl %a4,%d7
>> 1979 addl %d7,%a0@(mmu_next_physical)
>> 1980
>> 1981 mmu_print_tuple_exit:
>> 1982 moveml %sp@+,%d0-%d7/%a0
>> 1983 rts
>> 1984
>> 1985 mmu_print_machine_cpu_types:
>> 1986 puts "machine: "
>> 1987
>> 1988 is_not_amiga(1f)
>> 1989 puts "amiga"
>> 1990 jbra 9f
>> 1991 1:
>> 1992 is_not_atari(2f)
>> 1993 puts "atari"
>> 1994 jbra 9f
>> 1995 2:
>> 1996 is_not_mac(3f)
>> 1997 puts "macintosh"
>> 1998 jbra 9f
>> 1999 3: puts "unknown"
>> 2000 9: putc '\n'
>> 2001
>> 2002 puts "cputype: 0"
>> 2003 is_not_060(1f)
>> 2004 putc '6'
>> 2005 jbra 9f
>> 2006 1:
>> 2007 is_not_040_or_060(2f)
>> 2008 putc '4'
>> 2009 jbra 9f
>> 2010 2: putc '3'
>> 2011 9: putc '0'
>> 2012 putc '\n'
>> 2013
>> 2014 rts
>> 2015 #endif /* MMU_PRINT */
>> 2016
>> 2017 /*
>> 2018 * mmu_map_tt
>> 2019 *
>> 2020 * This is a specific function which works on all 680x0 machines.
>> 2021 * On 030, 040 & 060 it will attempt to use Transparent Translation
>> 2022 * registers (tt1).
>> 2023 * On 020 it will call the standard mmu_map which will use early
>> 2024 * terminating descriptors.
>> 2025 */
>> 2026 func_start mmu_map_tt,%d0/%d1/%a0,4
>> 2027
>> 2028 dputs "mmu_map_tt:"
>> 2029 dputn ARG1
>> 2030 dputn ARG2
>> 2031 dputn ARG3
>> 2032 dputn ARG4
>> 2033 dputc '\n'
>> 2034
>> 2035 is_020(L(do_map))
>> 2036
>> 2037 /* Extract the highest bit set
>> 2038 */
>> 2039 bfffo ARG3{#0,#32},%d1
>> 2040 cmpw #8,%d1
>> 2041 jcc L(do_map)
>> 2042
>> 2043 /* And get the mask
>> 2044 */
>> 2045 moveq #-1,%d0
>> 2046 lsrl %d1,%d0
>> 2047 lsrl #1,%d0
>> 2048
>> 2049 /* Mask the address
>> 2050 */
>> 2051 movel %d0,%d1
>> 2052 notl %d1
>> 2053 andl ARG2,%d1
>> 2054
>> 2055 /* Generate the upper 16bit of the tt register
>> 2056 */
>> 2057 lsrl #8,%d0
>> 2058 orl %d0,%d1
>> 2059 clrw %d1
>> 2060
>> 2061 is_040_or_060(L(mmu_map_tt_040))
>> 2062
>> 2063 /* set 030 specific bits (read/write access for supervisor mode
>> 2064 * (highest function code set, lower two bits masked))
>> 2065 */
>> 2066 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
>> 2067 movel ARG4,%d0
>> 2068 btst #6,%d0
>> 2069 jeq 1f
>> 2070 orw #TTR_CI,%d1
>> 2071
>> 2072 1: lea STACK,%a0
>> 2073 dputn %d1
>> 2074 movel %d1,%a0@
>> 2075 .chip 68030
>> 2076 tstl ARG1
>> 2077 jne 1f
>> 2078 pmove %a0@,%tt0
>> 2079 jra 2f
>> 2080 1: pmove %a0@,%tt1
>> 2081 2: .chip 68k
>> 2082 jra L(mmu_map_tt_done)
>> 2083
>> 2084 /* set 040 specific bits
>> 2085 */
>> 2086 L(mmu_map_tt_040):
>> 2087 orw #TTR_ENABLE+TTR_KERNELMODE,%d1
>> 2088 orl ARG4,%d1
>> 2089 dputn %d1
>> 2090
>> 2091 .chip 68040
>> 2092 tstl ARG1
>> 2093 jne 1f
>> 2094 movec %d1,%itt0
>> 2095 movec %d1,%dtt0
>> 2096 jra 2f
>> 2097 1: movec %d1,%itt1
>> 2098 movec %d1,%dtt1
>> 2099 2: .chip 68k
>> 2100
>> 2101 jra L(mmu_map_tt_done)
>> 2102
>> 2103 L(do_map):
>> 2104 mmu_map_eq ARG2,ARG3,ARG4
>> 2105
>> 2106 L(mmu_map_tt_done):
>> 2107
>> 2108 func_return mmu_map_tt
>> 2109
>> 2110 /*
>> 2111 * mmu_map
>> 2112 *
>> 2113 * This routine will map a range of memory using a pointer
>> 2114 * table and allocating the pages on the fly from the kernel.
>> 2115 * The pointer table does not have to be already linked into
>> 2116 * the root table, this routine will do that if necessary.
>> 2117 *
>> 2118 * NOTE
>> 2119 * This routine will assert failure and use the serial_putc
>> 2120 * routines in the case of a run-time error. For example,
>> 2121 * if the address is already mapped.
>> 2122 *
>> 2123 * NOTE-2
>> 2124 * This routine will use early terminating descriptors
>> 2125 * where possible for the 68020+68851 and 68030 type
>> 2126 * processors.
>> 2127 */
>> 2128 func_start mmu_map,%d0-%d4/%a0-%a4
>> 2129
>> 2130 dputs "\nmmu_map:"
>> 2131 dputn ARG1
>> 2132 dputn ARG2
>> 2133 dputn ARG3
>> 2134 dputn ARG4
>> 2135 dputc '\n'
>> 2136
>> 2137 /* Get logical address and round it down to 256KB
>> 2138 */
>> 2139 movel ARG1,%d0
>> 2140 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2141 movel %d0,%a3
>> 2142
>> 2143 /* Get the end address
>> 2144 */
>> 2145 movel ARG1,%a4
>> 2146 addl ARG3,%a4
>> 2147 subql #1,%a4
>> 2148
>> 2149 /* Get physical address and round it down to 256KB
>> 2150 */
>> 2151 movel ARG2,%d0
>> 2152 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2153 movel %d0,%a2
>> 2154
>> 2155 /* Add page attributes to the physical address
>> 2156 */
>> 2157 movel ARG4,%d0
>> 2158 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2159 addw %d0,%a2
>> 2160
>> 2161 dputn %a2
>> 2162 dputn %a3
>> 2163 dputn %a4
>> 2164
>> 2165 is_not_040_or_060(L(mmu_map_030))
>> 2166
>> 2167 addw #_PAGE_GLOBAL040,%a2
>> 2168 /*
>> 2169 * MMU 040 & 060 Support
>> 2170 *
>> 2171 * The MMU usage for the 040 and 060 is different enough from
>> 2172 * the 030 and 68851 that there is separate code. This comment
>> 2173 * block describes the data structures and algorithms built by
>> 2174 * this code.
>> 2175 *
>> 2176 * The 040 does not support early terminating descriptors, as
>> 2177 * the 030 does. Therefore, a third level of table is needed
>> 2178 * for the 040, and that would be the page table. In Linux,
>> 2179 * page tables are allocated directly from the memory above the
>> 2180 * kernel.
>> 2181 *
>> 2182 */
>> 2183
>> 2184 L(mmu_map_040):
>> 2185 /* Calculate the offset into the root table
>> 2186 */
>> 2187 movel %a3,%d0
>> 2188 moveq #ROOT_INDEX_SHIFT,%d1
>> 2189 lsrl %d1,%d0
>> 2190 mmu_get_root_table_entry %d0
>> 2191
>> 2192 /* Calculate the offset into the pointer table
>> 2193 */
>> 2194 movel %a3,%d0
>> 2195 moveq #PTR_INDEX_SHIFT,%d1
>> 2196 lsrl %d1,%d0
>> 2197 andl #PTR_TABLE_SIZE-1,%d0
>> 2198 mmu_get_ptr_table_entry %a0,%d0
>> 2199
>> 2200 /* Calculate the offset into the page table
>> 2201 */
>> 2202 movel %a3,%d0
>> 2203 moveq #PAGE_INDEX_SHIFT,%d1
>> 2204 lsrl %d1,%d0
>> 2205 andl #PAGE_TABLE_SIZE-1,%d0
>> 2206 mmu_get_page_table_entry %a0,%d0
>> 2207
>> 2208 /* The page table entry must not no be busy
>> 2209 */
>> 2210 tstl %a0@
>> 2211 jne L(mmu_map_error)
>> 2212
>> 2213 /* Do the mapping and advance the pointers
>> 2214 */
>> 2215 movel %a2,%a0@
>> 2216 2:
>> 2217 addw #PAGESIZE,%a2
>> 2218 addw #PAGESIZE,%a3
>> 2219
>> 2220 /* Ready with mapping?
>> 2221 */
>> 2222 lea %a3@(-1),%a0
>> 2223 cmpl %a0,%a4
>> 2224 jhi L(mmu_map_040)
>> 2225 jra L(mmu_map_done)
>> 2226
>> 2227 L(mmu_map_030):
>> 2228 /* Calculate the offset into the root table
>> 2229 */
>> 2230 movel %a3,%d0
>> 2231 moveq #ROOT_INDEX_SHIFT,%d1
>> 2232 lsrl %d1,%d0
>> 2233 mmu_get_root_table_entry %d0
>> 2234
>> 2235 /* Check if logical address 32MB aligned,
>> 2236 * so we can try to map it once
>> 2237 */
>> 2238 movel %a3,%d0
>> 2239 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
>> 2240 jne 1f
>> 2241
>> 2242 /* Is there enough to map for 32MB at once
>> 2243 */
>> 2244 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
>> 2245 cmpl %a1,%a4
>> 2246 jcs 1f
>> 2247
>> 2248 addql #1,%a1
>> 2249
>> 2250 /* The root table entry must not no be busy
>> 2251 */
>> 2252 tstl %a0@
>> 2253 jne L(mmu_map_error)
>> 2254
>> 2255 /* Do the mapping and advance the pointers
>> 2256 */
>> 2257 dputs "early term1"
>> 2258 dputn %a2
>> 2259 dputn %a3
>> 2260 dputn %a1
>> 2261 dputc '\n'
>> 2262 movel %a2,%a0@
>> 2263
>> 2264 movel %a1,%a3
>> 2265 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
>> 2266 jra L(mmu_mapnext_030)
>> 2267 1:
>> 2268 /* Calculate the offset into the pointer table
>> 2269 */
>> 2270 movel %a3,%d0
>> 2271 moveq #PTR_INDEX_SHIFT,%d1
>> 2272 lsrl %d1,%d0
>> 2273 andl #PTR_TABLE_SIZE-1,%d0
>> 2274 mmu_get_ptr_table_entry %a0,%d0
>> 2275
>> 2276 /* The pointer table entry must not no be busy
>> 2277 */
>> 2278 tstl %a0@
>> 2279 jne L(mmu_map_error)
>> 2280
>> 2281 /* Do the mapping and advance the pointers
>> 2282 */
>> 2283 dputs "early term2"
>> 2284 dputn %a2
>> 2285 dputn %a3
>> 2286 dputc '\n'
>> 2287 movel %a2,%a0@
>> 2288
>> 2289 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2
>> 2290 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3
>> 2291
>> 2292 L(mmu_mapnext_030):
>> 2293 /* Ready with mapping?
>> 2294 */
>> 2295 lea %a3@(-1),%a0
>> 2296 cmpl %a0,%a4
>> 2297 jhi L(mmu_map_030)
>> 2298 jra L(mmu_map_done)
>> 2299
>> 2300 L(mmu_map_error):
>> 2301
>> 2302 dputs "mmu_map error:"
>> 2303 dputn %a2
>> 2304 dputn %a3
>> 2305 dputc '\n'
>> 2306
>> 2307 L(mmu_map_done):
>> 2308
>> 2309 func_return mmu_map
>> 2310
>> 2311 /*
>> 2312 * mmu_fixup
>> 2313 *
>> 2314 * On the 040 class machines, all pages that are used for the
>> 2315 * mmu have to be fixed up.
>> 2316 */
>> 2317
>> 2318 func_start mmu_fixup_page_mmu_cache,%d0/%a0
>> 2319
>> 2320 dputs "mmu_fixup_page_mmu_cache"
>> 2321 dputn ARG1
>> 2322
>> 2323 /* Calculate the offset into the root table
>> 2324 */
>> 2325 movel ARG1,%d0
>> 2326 moveq #ROOT_INDEX_SHIFT,%d1
>> 2327 lsrl %d1,%d0
>> 2328 mmu_get_root_table_entry %d0
>> 2329
>> 2330 /* Calculate the offset into the pointer table
>> 2331 */
>> 2332 movel ARG1,%d0
>> 2333 moveq #PTR_INDEX_SHIFT,%d1
>> 2334 lsrl %d1,%d0
>> 2335 andl #PTR_TABLE_SIZE-1,%d0
>> 2336 mmu_get_ptr_table_entry %a0,%d0
>> 2337
>> 2338 /* Calculate the offset into the page table
>> 2339 */
>> 2340 movel ARG1,%d0
>> 2341 moveq #PAGE_INDEX_SHIFT,%d1
>> 2342 lsrl %d1,%d0
>> 2343 andl #PAGE_TABLE_SIZE-1,%d0
>> 2344 mmu_get_page_table_entry %a0,%d0
>> 2345
>> 2346 movel %a0@,%d0
>> 2347 andil #_CACHEMASK040,%d0
>> 2348 orl %pc@(m68k_pgtable_cachemode),%d0
>> 2349 movel %d0,%a0@
>> 2350
>> 2351 dputc '\n'
>> 2352
>> 2353 func_return mmu_fixup_page_mmu_cache
>> 2354
>> 2355 /*
>> 2356 * mmu_temp_map
>> 2357 *
>> 2358 * create a temporary mapping to enable the mmu,
>> 2359 * this we don't need any transparation translation tricks.
>> 2360 */
>> 2361
>> 2362 func_start mmu_temp_map,%d0/%d1/%a0/%a1
>> 2363
>> 2364 dputs "mmu_temp_map"
>> 2365 dputn ARG1
>> 2366 dputn ARG2
>> 2367 dputc '\n'
>> 2368
>> 2369 lea %pc@(L(temp_mmap_mem)),%a1
>> 2370
>> 2371 /* Calculate the offset in the root table
>> 2372 */
>> 2373 movel ARG2,%d0
>> 2374 moveq #ROOT_INDEX_SHIFT,%d1
>> 2375 lsrl %d1,%d0
>> 2376 mmu_get_root_table_entry %d0
>> 2377
>> 2378 /* Check if the table is temporary allocated, so we have to reuse it
>> 2379 */
>> 2380 movel %a0@,%d0
>> 2381 cmpl %pc@(L(memory_start)),%d0
>> 2382 jcc 1f
>> 2383
>> 2384 /* Temporary allocate a ptr table and insert it into the root table
>> 2385 */
>> 2386 movel %a1@,%d0
>> 2387 addl #PTR_TABLE_SIZE*4,%a1@
>> 2388 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2389 movel %d0,%a0@
>> 2390 dputs " (new)"
>> 2391 1:
>> 2392 dputn %d0
>> 2393 /* Mask the root table entry for the ptr table
>> 2394 */
>> 2395 andw #-ROOT_TABLE_SIZE,%d0
>> 2396 movel %d0,%a0
>> 2397
>> 2398 /* Calculate the offset into the pointer table
>> 2399 */
>> 2400 movel ARG2,%d0
>> 2401 moveq #PTR_INDEX_SHIFT,%d1
>> 2402 lsrl %d1,%d0
>> 2403 andl #PTR_TABLE_SIZE-1,%d0
>> 2404 lea %a0@(%d0*4),%a0
>> 2405 dputn %a0
>> 2406
>> 2407 /* Check if a temporary page table is already allocated
>> 2408 */
>> 2409 movel %a0@,%d0
>> 2410 jne 1f
>> 2411
>> 2412 /* Temporary allocate a page table and insert it into the ptr table
>> 2413 */
>> 2414 movel %a1@,%d0
>> 2415 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
>> 2416 alignment restriction for pointer tables on the '0[46]0. */
>> 2417 addl #512,%a1@
>> 2418 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2419 movel %d0,%a0@
>> 2420 dputs " (new)"
>> 2421 1:
>> 2422 dputn %d0
>> 2423 /* Mask the ptr table entry for the page table
>> 2424 */
>> 2425 andw #-PTR_TABLE_SIZE,%d0
>> 2426 movel %d0,%a0
>> 2427
>> 2428 /* Calculate the offset into the page table
>> 2429 */
>> 2430 movel ARG2,%d0
>> 2431 moveq #PAGE_INDEX_SHIFT,%d1
>> 2432 lsrl %d1,%d0
>> 2433 andl #PAGE_TABLE_SIZE-1,%d0
>> 2434 lea %a0@(%d0*4),%a0
>> 2435 dputn %a0
>> 2436
>> 2437 /* Insert the address into the page table
>> 2438 */
>> 2439 movel ARG1,%d0
>> 2440 andw #-PAGESIZE,%d0
>> 2441 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2442 movel %d0,%a0@
>> 2443 dputn %d0
>> 2444
>> 2445 dputc '\n'
>> 2446
>> 2447 func_return mmu_temp_map
>> 2448
>> 2449 func_start mmu_engage,%d0-%d2/%a0-%a3
>> 2450
>> 2451 moveq #ROOT_TABLE_SIZE-1,%d0
>> 2452 /* Temporarily use a different root table. */
>> 2453 lea %pc@(L(kernel_pgdir_ptr)),%a0
>> 2454 movel %a0@,%a2
>> 2455 movel %pc@(L(memory_start)),%a1
>> 2456 movel %a1,%a0@
>> 2457 movel %a2,%a0
>> 2458 1:
>> 2459 movel %a0@+,%a1@+
>> 2460 dbra %d0,1b
>> 2461
>> 2462 lea %pc@(L(temp_mmap_mem)),%a0
>> 2463 movel %a1,%a0@
>> 2464
>> 2465 movew #PAGESIZE-1,%d0
>> 2466 1:
>> 2467 clrl %a1@+
>> 2468 dbra %d0,1b
>> 2469
>> 2470 lea %pc@(1b),%a0
>> 2471 movel #1b,%a1
>> 2472 /* Skip temp mappings if phys == virt */
>> 2473 cmpl %a0,%a1
>> 2474 jeq 1f
>> 2475
>> 2476 mmu_temp_map %a0,%a0
>> 2477 mmu_temp_map %a0,%a1
>> 2478
>> 2479 addw #PAGESIZE,%a0
>> 2480 addw #PAGESIZE,%a1
>> 2481 mmu_temp_map %a0,%a0
>> 2482 mmu_temp_map %a0,%a1
>> 2483 1:
>> 2484 movel %pc@(L(memory_start)),%a3
>> 2485 movel %pc@(L(phys_kernel_start)),%d2
>> 2486
>> 2487 is_not_040_or_060(L(mmu_engage_030))
>> 2488
>> 2489 L(mmu_engage_040):
>> 2490 .chip 68040
>> 2491 nop
>> 2492 cinva %bc
>> 2493 nop
>> 2494 pflusha
>> 2495 nop
>> 2496 movec %a3,%srp
>> 2497 movel #TC_ENABLE+TC_PAGE4K,%d0
>> 2498 movec %d0,%tc /* enable the MMU */
>> 2499 jmp 1f:l
>> 2500 1: nop
>> 2501 movec %a2,%srp
>> 2502 nop
>> 2503 cinva %bc
>> 2504 nop
>> 2505 pflusha
>> 2506 .chip 68k
>> 2507 jra L(mmu_engage_cleanup)
>> 2508
>> 2509 L(mmu_engage_030_temp):
>> 2510 .space 12
>> 2511 L(mmu_engage_030):
>> 2512 .chip 68030
>> 2513 lea %pc@(L(mmu_engage_030_temp)),%a0
>> 2514 movel #0x80000002,%a0@
>> 2515 movel %a3,%a0@(4)
>> 2516 movel #0x0808,%d0
>> 2517 movec %d0,%cacr
>> 2518 pmove %a0@,%srp
>> 2519 pflusha
>> 2520 /*
>> 2521 * enable,super root enable,4096 byte pages,7 bit root index,
>> 2522 * 7 bit pointer index, 6 bit page table index.
>> 2523 */
>> 2524 movel #0x82c07760,%a0@(8)
>> 2525 pmove %a0@(8),%tc /* enable the MMU */
>> 2526 jmp 1f:l
>> 2527 1: movel %a2,%a0@(4)
>> 2528 movel #0x0808,%d0
>> 2529 movec %d0,%cacr
>> 2530 pmove %a0@,%srp
>> 2531 pflusha
>> 2532 .chip 68k
>> 2533
>> 2534 L(mmu_engage_cleanup):
>> 2535 subl #PAGE_OFFSET,%d2
>> 2536 subl %d2,%a2
>> 2537 movel %a2,L(kernel_pgdir_ptr)
>> 2538 subl %d2,%fp
>> 2539 subl %d2,%sp
>> 2540 subl %d2,ARG0
>> 2541
>> 2542 func_return mmu_engage
>> 2543
>> 2544 func_start mmu_get_root_table_entry,%d0/%a1
>> 2545
>> 2546 #if 0
>> 2547 dputs "mmu_get_root_table_entry:"
>> 2548 dputn ARG1
>> 2549 dputs " ="
>> 2550 #endif
>> 2551
>> 2552 movel %pc@(L(kernel_pgdir_ptr)),%a0
>> 2553 tstl %a0
>> 2554 jne 2f
>> 2555
>> 2556 dputs "\nmmu_init:"
>> 2557
>> 2558 /* Find the start of free memory, get_bi_record does this for us,
>> 2559 * as the bootinfo structure is located directly behind the kernel
>> 2560 * and and we simply search for the last entry.
>> 2561 */
>> 2562 get_bi_record BI_LAST
>> 2563 addw #PAGESIZE-1,%a0
>> 2564 movel %a0,%d0
>> 2565 andw #-PAGESIZE,%d0
>> 2566
>> 2567 dputn %d0
>> 2568
>> 2569 lea %pc@(L(memory_start)),%a0
>> 2570 movel %d0,%a0@
>> 2571 lea %pc@(L(kernel_end)),%a0
>> 2572 movel %d0,%a0@
>> 2573
>> 2574 /* we have to return the first page at _stext since the init code
>> 2575 * in mm/init.c simply expects kernel_pg_dir there, the rest of
>> 2576 * page is used for further ptr tables in get_ptr_table.
>> 2577 */
>> 2578 lea %pc@(_stext),%a0
>> 2579 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2580 movel %a0,%a1@
>> 2581 addl #ROOT_TABLE_SIZE*4,%a1@
>> 2582
>> 2583 lea %pc@(L(mmu_num_pointer_tables)),%a1
>> 2584 addql #1,%a1@
>> 2585
>> 2586 /* clear the page
>> 2587 */
>> 2588 movel %a0,%a1
>> 2589 movew #PAGESIZE/4-1,%d0
>> 2590 1:
>> 2591 clrl %a1@+
>> 2592 dbra %d0,1b
>> 2593
>> 2594 lea %pc@(L(kernel_pgdir_ptr)),%a1
>> 2595 movel %a0,%a1@
>> 2596
>> 2597 dputn %a0
>> 2598 dputc '\n'
>> 2599 2:
>> 2600 movel ARG1,%d0
>> 2601 lea %a0@(%d0*4),%a0
>> 2602
>> 2603 #if 0
>> 2604 dputn %a0
>> 2605 dputc '\n'
>> 2606 #endif
>> 2607
>> 2608 func_return mmu_get_root_table_entry
>> 2609
>> 2610
>> 2611
>> 2612 func_start mmu_get_ptr_table_entry,%d0/%a1
>> 2613
>> 2614 #if 0
>> 2615 dputs "mmu_get_ptr_table_entry:"
>> 2616 dputn ARG1
>> 2617 dputn ARG2
>> 2618 dputs " ="
>> 2619 #endif
>> 2620
>> 2621 movel ARG1,%a0
>> 2622 movel %a0@,%d0
>> 2623 jne 2f
>> 2624
>> 2625 /* Keep track of the number of pointer tables we use
>> 2626 */
>> 2627 dputs "\nmmu_get_new_ptr_table:"
>> 2628 lea %pc@(L(mmu_num_pointer_tables)),%a0
>> 2629 movel %a0@,%d0
>> 2630 addql #1,%a0@
>> 2631
>> 2632 /* See if there is a free pointer table in our cache of pointer tables
>> 2633 */
>> 2634 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2635 andw #7,%d0
>> 2636 jne 1f
>> 2637
>> 2638 /* Get a new pointer table page from above the kernel memory
>> 2639 */
>> 2640 get_new_page
>> 2641 movel %a0,%a1@
>> 2642 1:
>> 2643 /* There is an unused pointer table in our cache... use it
>> 2644 */
>> 2645 movel %a1@,%d0
>> 2646 addl #PTR_TABLE_SIZE*4,%a1@
>> 2647
>> 2648 dputn %d0
>> 2649 dputc '\n'
>> 2650
>> 2651 /* Insert the new pointer table into the root table
>> 2652 */
>> 2653 movel ARG1,%a0
>> 2654 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2655 movel %d0,%a0@
>> 2656 2:
>> 2657 /* Extract the pointer table entry
>> 2658 */
>> 2659 andw #-PTR_TABLE_SIZE,%d0
>> 2660 movel %d0,%a0
>> 2661 movel ARG2,%d0
>> 2662 lea %a0@(%d0*4),%a0
>> 2663
>> 2664 #if 0
>> 2665 dputn %a0
>> 2666 dputc '\n'
>> 2667 #endif
>> 2668
>> 2669 func_return mmu_get_ptr_table_entry
>> 2670
>> 2671
>> 2672 func_start mmu_get_page_table_entry,%d0/%a1
>> 2673
>> 2674 #if 0
>> 2675 dputs "mmu_get_page_table_entry:"
>> 2676 dputn ARG1
>> 2677 dputn ARG2
>> 2678 dputs " ="
>> 2679 #endif
>> 2680
>> 2681 movel ARG1,%a0
>> 2682 movel %a0@,%d0
>> 2683 jne 2f
>> 2684
>> 2685 /* If the page table entry doesn't exist, we allocate a complete new
>> 2686 * page and use it as one continues big page table which can cover
>> 2687 * 4MB of memory, nearly almost all mappings have that alignment.
>> 2688 */
>> 2689 get_new_page
>> 2690 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0
>> 2691
>> 2692 /* align pointer table entry for a page of page tables
>> 2693 */
>> 2694 movel ARG1,%d0
>> 2695 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
>> 2696 movel %d0,%a1
>> 2697
>> 2698 /* Insert the page tables into the pointer entries
>> 2699 */
>> 2700 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
>> 2701 1:
>> 2702 movel %a0,%a1@+
>> 2703 lea %a0@(PAGE_TABLE_SIZE*4),%a0
>> 2704 dbra %d0,1b
>> 2705
>> 2706 /* Now we can get the initialized pointer table entry
>> 2707 */
>> 2708 movel ARG1,%a0
>> 2709 movel %a0@,%d0
>> 2710 2:
>> 2711 /* Extract the page table entry
>> 2712 */
>> 2713 andw #-PAGE_TABLE_SIZE,%d0
>> 2714 movel %d0,%a0
>> 2715 movel ARG2,%d0
>> 2716 lea %a0@(%d0*4),%a0
>> 2717
>> 2718 #if 0
>> 2719 dputn %a0
>> 2720 dputc '\n'
>> 2721 #endif
>> 2722
>> 2723 func_return mmu_get_page_table_entry
>> 2724
>> 2725 /*
>> 2726 * get_new_page
>> 2727 *
>> 2728 * Return a new page from the memory start and clear it.
>> 2729 */
>> 2730 func_start get_new_page,%d0/%a1
>> 2731
>> 2732 dputs "\nget_new_page:"
>> 2733
>> 2734 /* allocate the page and adjust memory_start
>> 2735 */
>> 2736 lea %pc@(L(memory_start)),%a0
>> 2737 movel %a0@,%a1
>> 2738 addl #PAGESIZE,%a0@
>> 2739
>> 2740 /* clear the new page
>> 2741 */
>> 2742 movel %a1,%a0
>> 2743 movew #PAGESIZE/4-1,%d0
>> 2744 1:
>> 2745 clrl %a1@+
>> 2746 dbra %d0,1b
>> 2747
>> 2748 dputn %a0
>> 2749 dputc '\n'
>> 2750
>> 2751 func_return get_new_page
>> 2752
>> 2753
>> 2754
>> 2755 /*
>> 2756 * Debug output support
>> 2757 * Atarians have a choice between the parallel port, the serial port
>> 2758 * from the MFP or a serial port of the SCC
>> 2759 */
>> 2760
>> 2761 #ifdef CONFIG_MAC
>> 2762
>> 2763 L(scc_initable_mac):
>> 2764 .byte 9,12 /* Reset */
>> 2765 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2766 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2767 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2768 .byte 9,0 /* no interrupts */
>> 2769 .byte 10,0 /* NRZ */
>> 2770 .byte 11,0x50 /* use baud rate generator */
>> 2771 .byte 12,10,13,0 /* 9600 baud */
>> 2772 .byte 14,1 /* Baud rate generator enable */
>> 2773 .byte 3,0xc1 /* enable receiver */
>> 2774 .byte 5,0xea /* enable transmitter */
>> 2775 .byte -1
>> 2776 .even
>> 2777 #endif
>> 2778
>> 2779 #ifdef CONFIG_ATARI
>> 2780 /* #define USE_PRINTER */
>> 2781 /* #define USE_SCC_B */
>> 2782 /* #define USE_SCC_A */
>> 2783 #define USE_MFP
>> 2784
>> 2785 #if defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2786 #define USE_SCC
>> 2787 /* Initialisation table for SCC */
>> 2788 L(scc_initable):
>> 2789 .byte 9,12 /* Reset */
>> 2790 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2791 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2792 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2793 .byte 9,0 /* no interrupts */
>> 2794 .byte 10,0 /* NRZ */
>> 2795 .byte 11,0x50 /* use baud rate generator */
>> 2796 .byte 12,24,13,0 /* 9600 baud */
>> 2797 .byte 14,2,14,3 /* use master clock for BRG, enable */
>> 2798 .byte 3,0xc1 /* enable receiver */
>> 2799 .byte 5,0xea /* enable transmitter */
>> 2800 .byte -1
>> 2801 .even
>> 2802 #endif
>> 2803
>> 2804 #ifdef USE_PRINTER
>> 2805
>> 2806 LPSG_SELECT = 0xff8800
>> 2807 LPSG_READ = 0xff8800
>> 2808 LPSG_WRITE = 0xff8802
>> 2809 LPSG_IO_A = 14
>> 2810 LPSG_IO_B = 15
>> 2811 LPSG_CONTROL = 7
>> 2812 LSTMFP_GPIP = 0xfffa01
>> 2813 LSTMFP_DDR = 0xfffa05
>> 2814 LSTMFP_IERB = 0xfffa09
>> 2815
>> 2816 #elif defined(USE_SCC_B)
>> 2817
>> 2818 LSCC_CTRL = 0xff8c85
>> 2819 LSCC_DATA = 0xff8c87
>> 2820
>> 2821 #elif defined(USE_SCC_A)
>> 2822
>> 2823 LSCC_CTRL = 0xff8c81
>> 2824 LSCC_DATA = 0xff8c83
>> 2825
>> 2826 #elif defined(USE_MFP)
>> 2827
>> 2828 LMFP_UCR = 0xfffa29
>> 2829 LMFP_TDCDR = 0xfffa1d
>> 2830 LMFP_TDDR = 0xfffa25
>> 2831 LMFP_TSR = 0xfffa2d
>> 2832 LMFP_UDR = 0xfffa2f
>> 2833
>> 2834 #endif
>> 2835 #endif /* CONFIG_ATARI */
>> 2836
>> 2837 /*
>> 2838 * Serial port output support.
>> 2839 */
>> 2840
>> 2841 /*
>> 2842 * Initialize serial port hardware for 9600/8/1
>> 2843 */
>> 2844 func_start serial_init,%d0/%d1/%a0/%a1
>> 2845 /*
>> 2846 * Some of the register usage that follows
>> 2847 * CONFIG_AMIGA
>> 2848 * a0 = pointer to boot info record
>> 2849 * d0 = boot info offset
>> 2850 * CONFIG_ATARI
>> 2851 * a0 = address of SCC
>> 2852 * a1 = Liobase address/address of scc_initable
>> 2853 * d0 = init data for serial port
>> 2854 * CONFIG_MAC
>> 2855 * a0 = address of SCC
>> 2856 * a1 = address of scc_initable_mac
>> 2857 * d0 = init data for serial port
>> 2858 */
>> 2859
>> 2860 #ifdef CONFIG_AMIGA
>> 2861 #define SERIAL_DTR 7
>> 2862 #define SERIAL_CNTRL CIABBASE+C_PRA
>> 2863
>> 2864 is_not_amiga(1f)
>> 2865 lea %pc@(L(custom)),%a0
>> 2866 movel #-ZTWOBASE,%a0@
>> 2867 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
>> 2868 get_bi_record BI_AMIGA_SERPER
>> 2869 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2870 | movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2871 1:
>> 2872 #endif
>> 2873 #ifdef CONFIG_ATARI
>> 2874 is_not_atari(4f)
>> 2875 movel %pc@(L(iobase)),%a1
>> 2876 #if defined(USE_PRINTER)
>> 2877 bclr #0,%a1@(LSTMFP_IERB)
>> 2878 bclr #0,%a1@(LSTMFP_DDR)
>> 2879 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT)
>> 2880 moveb #0xff,%a1@(LPSG_WRITE)
>> 2881 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 2882 clrb %a1@(LPSG_WRITE)
>> 2883 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 2884 moveb %a1@(LPSG_READ),%d0
>> 2885 bset #5,%d0
>> 2886 moveb %d0,%a1@(LPSG_WRITE)
>> 2887 #elif defined(USE_SCC)
>> 2888 lea %a1@(LSCC_CTRL),%a0
>> 2889 lea %pc@(L(scc_initable)),%a1
>> 2890 2: moveb %a1@+,%d0
>> 2891 jmi 3f
>> 2892 moveb %d0,%a0@
>> 2893 moveb %a1@+,%a0@
>> 2894 jra 2b
>> 2895 3: clrb %a0@
>> 2896 #elif defined(USE_MFP)
>> 2897 bclr #1,%a1@(LMFP_TSR)
>> 2898 moveb #0x88,%a1@(LMFP_UCR)
>> 2899 andb #0x70,%a1@(LMFP_TDCDR)
>> 2900 moveb #2,%a1@(LMFP_TDDR)
>> 2901 orb #1,%a1@(LMFP_TDCDR)
>> 2902 bset #1,%a1@(LMFP_TSR)
>> 2903 #endif
>> 2904 jra L(serial_init_done)
>> 2905 4:
>> 2906 #endif
>> 2907 #ifdef CONFIG_MAC
>> 2908 is_not_mac(L(serial_init_not_mac))
>> 2909 #ifdef MAC_SERIAL_DEBUG
>> 2910 #if !defined(MAC_USE_SCC_A) && !defined(MAC_USE_SCC_B)
>> 2911 #define MAC_USE_SCC_B
>> 2912 #endif
>> 2913 #define mac_scc_cha_b_ctrl_offset 0x0
>> 2914 #define mac_scc_cha_a_ctrl_offset 0x2
>> 2915 #define mac_scc_cha_b_data_offset 0x4
>> 2916 #define mac_scc_cha_a_data_offset 0x6
>> 2917
>> 2918 #ifdef MAC_USE_SCC_A
>> 2919 /* Initialize channel A */
>> 2920 movel %pc@(L(mac_sccbase)),%a0
>> 2921 lea %pc@(L(scc_initable_mac)),%a1
>> 2922 5: moveb %a1@+,%d0
>> 2923 jmi 6f
>> 2924 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2925 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2926 jra 5b
>> 2927 6:
>> 2928 #endif /* MAC_USE_SCC_A */
>> 2929
>> 2930 #ifdef MAC_USE_SCC_B
>> 2931 /* Initialize channel B */
>> 2932 #ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */
>> 2933 movel %pc@(L(mac_sccbase)),%a0
>> 2934 #endif /* MAC_USE_SCC_A */
>> 2935 lea %pc@(L(scc_initable_mac)),%a1
>> 2936 7: moveb %a1@+,%d0
>> 2937 jmi 8f
>> 2938 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2939 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2940 jra 7b
>> 2941 8:
>> 2942 #endif /* MAC_USE_SCC_B */
>> 2943 #endif /* MAC_SERIAL_DEBUG */
>> 2944
>> 2945 jra L(serial_init_done)
>> 2946 L(serial_init_not_mac):
>> 2947 #endif /* CONFIG_MAC */
>> 2948
>> 2949 #ifdef CONFIG_Q40
>> 2950 is_not_q40(2f)
>> 2951 /* debug output goes into SRAM, so we don't do it unless requested
>> 2952 - check for '%LX$' signature in SRAM */
>> 2953 lea %pc@(q40_mem_cptr),%a1
>> 2954 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */
>> 2955 move.l #0xff020000,%a1
>> 2956 cmp.b #'%',%a1@
>> 2957 bne 2f /*nodbg*/
>> 2958 addq.w #4,%a1
>> 2959 cmp.b #'L',%a1@
>> 2960 bne 2f /*nodbg*/
>> 2961 addq.w #4,%a1
>> 2962 cmp.b #'X',%a1@
>> 2963 bne 2f /*nodbg*/
>> 2964 addq.w #4,%a1
>> 2965 cmp.b #'$',%a1@
>> 2966 bne 2f /*nodbg*/
>> 2967 /* signature OK */
>> 2968 lea %pc@(L(q40_do_debug)),%a1
>> 2969 tas %a1@
>> 2970 /*nodbg: q40_do_debug is 0 by default*/
>> 2971 2:
>> 2972 #endif
>> 2973
>> 2974 #ifdef CONFIG_APOLLO
>> 2975 /* We count on the PROM initializing SIO1 */
>> 2976 #endif
>> 2977
>> 2978 #ifdef CONFIG_HP300
>> 2979 /* We count on the boot loader initialising the UART */
>> 2980 #endif
>> 2981
>> 2982 L(serial_init_done):
>> 2983 func_return serial_init
>> 2984
>> 2985 /*
>> 2986 * Output character on serial port.
>> 2987 */
>> 2988 func_start serial_putc,%d0/%d1/%a0/%a1
>> 2989
>> 2990 movel ARG1,%d0
>> 2991 cmpib #'\n',%d0
>> 2992 jbne 1f
>> 2993
>> 2994 /* A little safe recursion is good for the soul */
>> 2995 serial_putc #'\r'
>> 2996 1:
>> 2997
>> 2998 #ifdef CONFIG_AMIGA
>> 2999 is_not_amiga(2f)
>> 3000 andw #0x00ff,%d0
>> 3001 oriw #0x0100,%d0
>> 3002 movel %pc@(L(custom)),%a0
>> 3003 movew %d0,%a0@(CUSTOMBASE+C_SERDAT)
>> 3004 1: movew %a0@(CUSTOMBASE+C_SERDATR),%d0
>> 3005 andw #0x2000,%d0
>> 3006 jeq 1b
>> 3007 jra L(serial_putc_done)
>> 3008 2:
>> 3009 #endif
>> 3010
>> 3011 #ifdef CONFIG_MAC
>> 3012 is_not_mac(5f)
>> 3013
>> 3014 #ifdef MAC_SERIAL_DEBUG
>> 3015
>> 3016 #ifdef MAC_USE_SCC_A
>> 3017 movel %pc@(L(mac_sccbase)),%a1
>> 3018 3: btst #2,%a1@(mac_scc_cha_a_ctrl_offset)
>> 3019 jeq 3b
>> 3020 moveb %d0,%a1@(mac_scc_cha_a_data_offset)
>> 3021 #endif /* MAC_USE_SCC_A */
>> 3022
>> 3023 #ifdef MAC_USE_SCC_B
>> 3024 #ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */
>> 3025 movel %pc@(L(mac_sccbase)),%a1
>> 3026 #endif /* MAC_USE_SCC_A */
>> 3027 4: btst #2,%a1@(mac_scc_cha_b_ctrl_offset)
>> 3028 jeq 4b
>> 3029 moveb %d0,%a1@(mac_scc_cha_b_data_offset)
>> 3030 #endif /* MAC_USE_SCC_B */
>> 3031
>> 3032 #endif /* MAC_SERIAL_DEBUG */
>> 3033
>> 3034 jra L(serial_putc_done)
>> 3035 5:
>> 3036 #endif /* CONFIG_MAC */
>> 3037
>> 3038 #ifdef CONFIG_ATARI
>> 3039 is_not_atari(4f)
>> 3040 movel %pc@(L(iobase)),%a1
>> 3041 #if defined(USE_PRINTER)
>> 3042 3: btst #0,%a1@(LSTMFP_GPIP)
>> 3043 jne 3b
>> 3044 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 3045 moveb %d0,%a1@(LPSG_WRITE)
>> 3046 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 3047 moveb %a1@(LPSG_READ),%d0
>> 3048 bclr #5,%d0
>> 3049 moveb %d0,%a1@(LPSG_WRITE)
>> 3050 nop
>> 3051 nop
>> 3052 bset #5,%d0
>> 3053 moveb %d0,%a1@(LPSG_WRITE)
>> 3054 #elif defined(USE_SCC)
>> 3055 3: btst #2,%a1@(LSCC_CTRL)
>> 3056 jeq 3b
>> 3057 moveb %d0,%a1@(LSCC_DATA)
>> 3058 #elif defined(USE_MFP)
>> 3059 3: btst #7,%a1@(LMFP_TSR)
>> 3060 jeq 3b
>> 3061 moveb %d0,%a1@(LMFP_UDR)
>> 3062 #endif
>> 3063 jra L(serial_putc_done)
>> 3064 4:
>> 3065 #endif /* CONFIG_ATARI */
>> 3066
>> 3067 #ifdef CONFIG_MVME147
>> 3068 is_not_mvme147(2f)
>> 3069 1: btst #2,M147_SCC_CTRL_A
>> 3070 jeq 1b
>> 3071 moveb %d0,M147_SCC_DATA_A
>> 3072 jbra L(serial_putc_done)
>> 3073 2:
>> 3074 #endif
>> 3075
>> 3076 #ifdef CONFIG_MVME16x
>> 3077 is_not_mvme16x(2f)
>> 3078 /*
>> 3079 * If the loader gave us a board type then we can use that to
>> 3080 * select an appropriate output routine; otherwise we just use
>> 3081 * the Bug code. If we haev to use the Bug that means the Bug
>> 3082 * workspace has to be valid, which means the Bug has to use
>> 3083 * the SRAM, which is non-standard.
>> 3084 */
>> 3085 moveml %d0-%d7/%a2-%a6,%sp@-
>> 3086 movel vme_brdtype,%d1
>> 3087 jeq 1f | No tag - use the Bug
>> 3088 cmpi #VME_TYPE_MVME162,%d1
>> 3089 jeq 6f
>> 3090 cmpi #VME_TYPE_MVME172,%d1
>> 3091 jne 5f
>> 3092 /* 162/172; it's an SCC */
>> 3093 6: btst #2,M162_SCC_CTRL_A
>> 3094 nop
>> 3095 nop
>> 3096 nop
>> 3097 jeq 6b
>> 3098 moveb #8,M162_SCC_CTRL_A
>> 3099 nop
>> 3100 nop
>> 3101 nop
>> 3102 moveb %d0,M162_SCC_CTRL_A
>> 3103 jra 3f
>> 3104 5:
>> 3105 /* 166/167/177; it's a CD2401 */
>> 3106 moveb #0,M167_CYCAR
>> 3107 moveb M167_CYIER,%d2
>> 3108 moveb #0x02,M167_CYIER
>> 3109 7:
>> 3110 btst #5,M167_PCSCCTICR
>> 3111 jeq 7b
>> 3112 moveb M167_PCTPIACKR,%d1
>> 3113 moveb M167_CYLICR,%d1
>> 3114 jeq 8f
>> 3115 moveb #0x08,M167_CYTEOIR
>> 3116 jra 7b
>> 3117 8:
>> 3118 moveb %d0,M167_CYTDR
>> 3119 moveb #0,M167_CYTEOIR
>> 3120 moveb %d2,M167_CYIER
>> 3121 jra 3f
>> 3122 1:
>> 3123 moveb %d0,%sp@-
>> 3124 trap #15
>> 3125 .word 0x0020 /* TRAP 0x020 */
>> 3126 3:
>> 3127 moveml %sp@+,%d0-%d7/%a2-%a6
>> 3128 jbra L(serial_putc_done)
>> 3129 2:
>> 3130 #endif /* CONFIG_MVME16x */
>> 3131
>> 3132 #ifdef CONFIG_BVME6000
>> 3133 is_not_bvme6000(2f)
>> 3134 /*
>> 3135 * The BVME6000 machine has a serial port ...
>> 3136 */
>> 3137 1: btst #2,BVME_SCC_CTRL_A
>> 3138 jeq 1b
>> 3139 moveb %d0,BVME_SCC_DATA_A
>> 3140 jbra L(serial_putc_done)
>> 3141 2:
>> 3142 #endif
>> 3143
>> 3144 #ifdef CONFIG_SUN3X
>> 3145 is_not_sun3x(2f)
>> 3146 movel %d0,-(%sp)
>> 3147 movel 0xFEFE0018,%a1
>> 3148 jbsr (%a1)
>> 3149 addq #4,%sp
>> 3150 jbra L(serial_putc_done)
>> 3151 2:
>> 3152 #endif
>> 3153
>> 3154 #ifdef CONFIG_Q40
>> 3155 is_not_q40(2f)
>> 3156 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */
>> 3157 beq 2f
>> 3158 lea %pc@(q40_mem_cptr),%a1
>> 3159 move.l %a1@,%a0
>> 3160 move.b %d0,%a0@
>> 3161 addq.l #4,%a0
>> 3162 move.l %a0,%a1@
>> 3163 jbra L(serial_putc_done)
>> 3164 2:
>> 3165 #endif
>> 3166
>> 3167 #ifdef CONFIG_APOLLO
>> 3168 is_not_apollo(2f)
>> 3169 movl %pc@(L(iobase)),%a1
>> 3170 moveb %d0,%a1@(LTHRB0)
>> 3171 1: moveb %a1@(LSRB0),%d0
>> 3172 andb #0x4,%d0
>> 3173 beq 1b
>> 3174 jbra L(serial_putc_done)
>> 3175 2:
>> 3176 #endif
>> 3177
>> 3178 #ifdef CONFIG_HP300
>> 3179 is_not_hp300(3f)
>> 3180 movl %pc@(L(iobase)),%a1
>> 3181 addl %pc@(L(uartbase)),%a1
>> 3182 movel %pc@(L(uart_scode)),%d1 /* Check the scode */
>> 3183 jmi 3f /* Unset? Exit */
>> 3184 cmpi #256,%d1 /* APCI scode? */
>> 3185 jeq 2f
>> 3186 1: moveb %a1@(DCALSR),%d1 /* Output to DCA */
>> 3187 andb #0x20,%d1
>> 3188 beq 1b
>> 3189 moveb %d0,%a1@(DCADATA)
>> 3190 jbra L(serial_putc_done)
>> 3191 2: moveb %a1@(APCILSR),%d1 /* Output to APCI */
>> 3192 andb #0x20,%d1
>> 3193 beq 2b
>> 3194 moveb %d0,%a1@(APCIDATA)
>> 3195 jbra L(serial_putc_done)
>> 3196 3:
>> 3197 #endif
>> 3198
>> 3199 L(serial_putc_done):
>> 3200 func_return serial_putc
>> 3201
>> 3202 /*
>> 3203 * Output a string.
>> 3204 */
>> 3205 func_start puts,%d0/%a0
>> 3206
>> 3207 movel ARG1,%a0
>> 3208 jra 2f
>> 3209 1:
>> 3210 #ifdef CONSOLE
>> 3211 console_putc %d0
>> 3212 #endif
>> 3213 #ifdef SERIAL_DEBUG
>> 3214 serial_putc %d0
>> 3215 #endif
>> 3216 2: moveb %a0@+,%d0
>> 3217 jne 1b
>> 3218
>> 3219 func_return puts
>> 3220
>> 3221 /*
>> 3222 * Output number in hex notation.
>> 3223 */
>> 3224
>> 3225 func_start putn,%d0-%d2
>> 3226
>> 3227 putc ' '
>> 3228
>> 3229 movel ARG1,%d0
>> 3230 moveq #7,%d1
>> 3231 1: roll #4,%d0
>> 3232 move %d0,%d2
>> 3233 andb #0x0f,%d2
>> 3234 addb #'0',%d2
>> 3235 cmpb #'9',%d2
>> 3236 jls 2f
>> 3237 addb #'A'-('9'+1),%d2
>> 3238 2:
>> 3239 #ifdef CONSOLE
>> 3240 console_putc %d2
>> 3241 #endif
>> 3242 #ifdef SERIAL_DEBUG
>> 3243 serial_putc %d2
>> 3244 #endif
>> 3245 dbra %d1,1b
>> 3246
>> 3247 func_return putn
>> 3248
>> 3249 #ifdef CONFIG_MAC
>> 3250 /*
>> 3251 * mac_serial_print
>> 3252 *
>> 3253 * This routine takes its parameters on the stack. It then
>> 3254 * turns around and calls the internal routine. This routine
>> 3255 * is used until the Linux console driver initializes itself.
>> 3256 *
>> 3257 * The calling parameters are:
>> 3258 * void mac_serial_print(const char *str);
>> 3259 *
>> 3260 * This routine does NOT understand variable arguments only
>> 3261 * simple strings!
>> 3262 */
>> 3263 ENTRY(mac_serial_print)
>> 3264 moveml %d0/%a0,%sp@-
>> 3265 #if 1
>> 3266 move %sr,%sp@-
>> 3267 ori #0x0700,%sr
>> 3268 #endif
>> 3269 movel %sp@(10),%a0 /* fetch parameter */
>> 3270 jra 2f
>> 3271 1: serial_putc %d0
>> 3272 2: moveb %a0@+,%d0
>> 3273 jne 1b
>> 3274 #if 1
>> 3275 move %sp@+,%sr
>> 3276 #endif
>> 3277 moveml %sp@+,%d0/%a0
>> 3278 rts
>> 3279 #endif /* CONFIG_MAC */
>> 3280
>> 3281 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3282 func_start set_leds,%d0/%a0
>> 3283 movel ARG1,%d0
>> 3284 #ifdef CONFIG_HP300
>> 3285 is_not_hp300(1f)
>> 3286 movel %pc@(L(iobase)),%a0
>> 3287 moveb %d0,%a0@(0x1ffff)
>> 3288 jra 2f
>> 3289 #endif
>> 3290 1:
>> 3291 #ifdef CONFIG_APOLLO
>> 3292 movel %pc@(L(iobase)),%a0
>> 3293 lsll #8,%d0
>> 3294 eorw #0xff00,%d0
>> 3295 moveb %d0,%a0@(LCPUCTRL)
>> 3296 #endif
>> 3297 2:
>> 3298 func_return set_leds
>> 3299 #endif
>> 3300
>> 3301 #ifdef CONSOLE
>> 3302 /*
>> 3303 * For continuity, see the data alignment
>> 3304 * to which this structure is tied.
>> 3305 */
>> 3306 #define Lconsole_struct_cur_column 0
>> 3307 #define Lconsole_struct_cur_row 4
>> 3308 #define Lconsole_struct_num_columns 8
>> 3309 #define Lconsole_struct_num_rows 12
>> 3310 #define Lconsole_struct_left_edge 16
>> 3311 #define Lconsole_struct_penguin_putc 20
>> 3312
>> 3313 func_start console_init,%a0-%a4/%d0-%d7
>> 3314 /*
>> 3315 * Some of the register usage that follows
>> 3316 * a0 = pointer to boot_info
>> 3317 * a1 = pointer to screen
>> 3318 * a2 = pointer to Lconsole_globals
>> 3319 * d3 = pixel width of screen
>> 3320 * d4 = pixel height of screen
>> 3321 * (d3,d4) ~= (x,y) of a point just below
>> 3322 * and to the right of the screen
>> 3323 * NOT on the screen!
>> 3324 * d5 = number of bytes per scan line
>> 3325 * d6 = number of bytes on the entire screen
>> 3326 */
>> 3327
>> 3328 lea %pc@(L(console_globals)),%a2
>> 3329 movel %pc@(L(mac_videobase)),%a1
>> 3330 movel %pc@(L(mac_rowbytes)),%d5
>> 3331 movel %pc@(L(mac_dimensions)),%d3 /* -> low byte */
>> 3332 movel %d3,%d4
>> 3333 swap %d4 /* -> high byte */
>> 3334 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3335 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3336
>> 3337 movel %d5,%d6
>> 3338 | subl #20,%d6
>> 3339 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3340 divul #8,%d6 /* we'll clear 8 bytes at a time */
>> 3341 moveq #-1,%d0 /* Mac_black */
>> 3342 subq #1,%d6
>> 3343
>> 3344 L(console_clear_loop):
>> 3345 movel %d0,%a1@+
>> 3346 movel %d0,%a1@+
>> 3347 dbra %d6,L(console_clear_loop)
>> 3348
>> 3349 /* Calculate font size */
>> 3350
>> 3351 #if defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
>> 3352 lea %pc@(font_vga_8x8),%a0
>> 3353 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
>> 3354 lea %pc@(font_vga_8x16),%a0
>> 3355 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
>> 3356 lea %pc@(font_vga_6x11),%a0
>> 3357 #elif defined(CONFIG_FONT_8x8) /* default */
>> 3358 lea %pc@(font_vga_8x8),%a0
>> 3359 #else /* no compiled-in font */
>> 3360 lea 0,%a0
>> 3361 #endif
>> 3362
>> 3363 /*
>> 3364 * At this point we make a shift in register usage
>> 3365 * a1 = address of console_font pointer
>> 3366 */
>> 3367 lea %pc@(L(console_font)),%a1
>> 3368 movel %a0,%a1@ /* store pointer to struct fbcon_font_desc in console_font */
>> 3369 tstl %a0
>> 3370 jeq 1f
>> 3371 lea %pc@(L(console_font_data)),%a4
>> 3372 movel %a0@(FONT_DESC_DATA),%d0
>> 3373 subl #L(console_font),%a1
>> 3374 addl %a1,%d0
>> 3375 movel %d0,%a4@
>> 3376
>> 3377 /*
>> 3378 * Calculate global maxs
>> 3379 * Note - we can use either an
>> 3380 * 8 x 16 or 8 x 8 character font
>> 3381 * 6 x 11 also supported
>> 3382 */
>> 3383 /* ASSERT: a0 = contents of Lconsole_font */
>> 3384 movel %d3,%d0 /* screen width in pixels */
>> 3385 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */
>> 3386
>> 3387 movel %d4,%d1 /* screen height in pixels */
>> 3388 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */
>> 3389
>> 3390 movel %d0,%a2@(Lconsole_struct_num_columns)
>> 3391 movel %d1,%a2@(Lconsole_struct_num_rows)
>> 3392
>> 3393 /*
>> 3394 * Clear the current row and column
>> 3395 */
>> 3396 clrl %a2@(Lconsole_struct_cur_column)
>> 3397 clrl %a2@(Lconsole_struct_cur_row)
>> 3398 clrl %a2@(Lconsole_struct_left_edge)
>> 3399
>> 3400 /*
>> 3401 * Initialization is complete
>> 3402 */
>> 3403 1:
>> 3404 func_return console_init
>> 3405
>> 3406 func_start console_put_stats,%a0/%d7
>> 3407 /*
>> 3408 * Some of the register usage that follows
>> 3409 * a0 = pointer to boot_info
>> 3410 * d7 = value of boot_info fields
>> 3411 */
>> 3412 puts "\nMacLinux\n\n"
>> 3413
>> 3414 #ifdef SERIAL_DEBUG
>> 3415 puts " vidaddr:"
>> 3416 putn %pc@(L(mac_videobase)) /* video addr. */
>> 3417
>> 3418 puts "\n _stext:"
>> 3419 lea %pc@(_stext),%a0
>> 3420 putn %a0
>> 3421
>> 3422 puts "\nbootinfo:"
>> 3423 lea %pc@(_end),%a0
>> 3424 putn %a0
>> 3425
>> 3426 puts "\ncpuid:"
>> 3427 putn %pc@(L(cputype))
>> 3428 putc '\n'
>> 3429
>> 3430 #ifdef MAC_SERIAL_DEBUG
>> 3431 putn %pc@(L(mac_sccbase))
>> 3432 putc '\n'
>> 3433 #endif
>> 3434 # if defined(MMU_PRINT)
>> 3435 jbsr mmu_print_machine_cpu_types
>> 3436 # endif /* MMU_PRINT */
>> 3437 #endif /* SERIAL_DEBUG */
>> 3438
>> 3439 func_return console_put_stats
>> 3440
>> 3441 #ifdef CONSOLE_PENGUIN
>> 3442 func_start console_put_penguin,%a0-%a1/%d0-%d7
>> 3443 /*
>> 3444 * Get 'that_penguin' onto the screen in the upper right corner
>> 3445 * penguin is 64 x 74 pixels, align against right edge of screen
>> 3446 */
>> 3447 lea %pc@(L(mac_dimensions)),%a0
>> 3448 movel %a0@,%d0
>> 3449 andil #0xffff,%d0
>> 3450 subil #64,%d0 /* snug up against the right edge */
>> 3451 clrl %d1 /* start at the top */
>> 3452 movel #73,%d7
>> 3453 lea %pc@(L(that_penguin)),%a1
>> 3454 L(console_penguin_row):
>> 3455 movel #31,%d6
>> 3456 L(console_penguin_pixel_pair):
>> 3457 moveb %a1@,%d2
>> 3458 lsrb #4,%d2
>> 3459 console_plot_pixel %d0,%d1,%d2
>> 3460 addq #1,%d0
>> 3461 moveb %a1@+,%d2
>> 3462 console_plot_pixel %d0,%d1,%d2
>> 3463 addq #1,%d0
>> 3464 dbra %d6,L(console_penguin_pixel_pair)
>> 3465
>> 3466 subil #64,%d0
>> 3467 addq #1,%d1
>> 3468 dbra %d7,L(console_penguin_row)
>> 3469
>> 3470 func_return console_put_penguin
>> 3471
>> 3472 /* include penguin bitmap */
>> 3473 L(that_penguin):
>> 3474 #include "../mac/mac_penguin.S"
>> 3475 #endif
>> 3476
>> 3477 /*
>> 3478 * Calculate source and destination addresses
>> 3479 * output a1 = dest
>> 3480 * a2 = source
>> 3481 */
>> 3482
>> 3483 func_start console_scroll,%a0-%a4/%d0-%d7
>> 3484 lea %pc@(L(mac_videobase)),%a0
>> 3485 movel %a0@,%a1
>> 3486 movel %a1,%a2
>> 3487 lea %pc@(L(mac_rowbytes)),%a0
>> 3488 movel %a0@,%d5
>> 3489 movel %pc@(L(console_font)),%a0
>> 3490 tstl %a0
>> 3491 jeq 1f
>> 3492 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */
>> 3493 addal %d5,%a2
>> 3494
>> 3495 /*
>> 3496 * Get dimensions
>> 3497 */
>> 3498 lea %pc@(L(mac_dimensions)),%a0
>> 3499 movel %a0@,%d3
>> 3500 movel %d3,%d4
>> 3501 swap %d4
>> 3502 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3503 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3504
>> 3505 /*
>> 3506 * Calculate number of bytes to move
>> 3507 */
>> 3508 lea %pc@(L(mac_rowbytes)),%a0
>> 3509 movel %a0@,%d6
>> 3510 movel %pc@(L(console_font)),%a0
>> 3511 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */
>> 3512 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3513 divul #32,%d6 /* we'll move 8 longs at a time */
>> 3514 subq #1,%d6
>> 3515
>> 3516 L(console_scroll_loop):
>> 3517 movel %a2@+,%a1@+
>> 3518 movel %a2@+,%a1@+
>> 3519 movel %a2@+,%a1@+
>> 3520 movel %a2@+,%a1@+
>> 3521 movel %a2@+,%a1@+
>> 3522 movel %a2@+,%a1@+
>> 3523 movel %a2@+,%a1@+
>> 3524 movel %a2@+,%a1@+
>> 3525 dbra %d6,L(console_scroll_loop)
>> 3526
>> 3527 lea %pc@(L(mac_rowbytes)),%a0
>> 3528 movel %a0@,%d6
>> 3529 movel %pc@(L(console_font)),%a0
>> 3530 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */
>> 3531 divul #32,%d6 /* we'll move 8 words at a time */
>> 3532 subq #1,%d6
>> 3533
>> 3534 moveq #-1,%d0
>> 3535 L(console_scroll_clear_loop):
>> 3536 movel %d0,%a1@+
>> 3537 movel %d0,%a1@+
>> 3538 movel %d0,%a1@+
>> 3539 movel %d0,%a1@+
>> 3540 movel %d0,%a1@+
>> 3541 movel %d0,%a1@+
>> 3542 movel %d0,%a1@+
>> 3543 movel %d0,%a1@+
>> 3544 dbra %d6,L(console_scroll_clear_loop)
>> 3545
>> 3546 1:
>> 3547 func_return console_scroll
>> 3548
>> 3549
>> 3550 func_start console_putc,%a0/%a1/%d0-%d7
>> 3551
>> 3552 is_not_mac(L(console_exit))
>> 3553 tstl %pc@(L(console_font))
>> 3554 jeq L(console_exit)
>> 3555
>> 3556 /* Output character in d7 on console.
>> 3557 */
>> 3558 movel ARG1,%d7
>> 3559 cmpib #'\n',%d7
>> 3560 jbne 1f
>> 3561
>> 3562 /* A little safe recursion is good for the soul */
>> 3563 console_putc #'\r'
>> 3564 1:
>> 3565 lea %pc@(L(console_globals)),%a0
>> 3566
>> 3567 cmpib #10,%d7
>> 3568 jne L(console_not_lf)
>> 3569 movel %a0@(Lconsole_struct_cur_row),%d0
>> 3570 addil #1,%d0
>> 3571 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3572 movel %a0@(Lconsole_struct_num_rows),%d1
>> 3573 cmpl %d1,%d0
>> 3574 jcs 1f
>> 3575 subil #1,%d0
>> 3576 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3577 console_scroll
>> 3578 1:
>> 3579 jra L(console_exit)
>> 3580
>> 3581 L(console_not_lf):
>> 3582 cmpib #13,%d7
>> 3583 jne L(console_not_cr)
>> 3584 clrl %a0@(Lconsole_struct_cur_column)
>> 3585 jra L(console_exit)
>> 3586
>> 3587 L(console_not_cr):
>> 3588 cmpib #1,%d7
>> 3589 jne L(console_not_home)
>> 3590 clrl %a0@(Lconsole_struct_cur_row)
>> 3591 clrl %a0@(Lconsole_struct_cur_column)
>> 3592 jra L(console_exit)
>> 3593
>> 3594 /*
>> 3595 * At this point we know that the %d7 character is going to be
>> 3596 * rendered on the screen. Register usage is -
>> 3597 * a0 = pointer to console globals
>> 3598 * a1 = font data
>> 3599 * d0 = cursor column
>> 3600 * d1 = cursor row to draw the character
>> 3601 * d7 = character number
>> 3602 */
>> 3603 L(console_not_home):
>> 3604 movel %a0@(Lconsole_struct_cur_column),%d0
>> 3605 addql #1,%a0@(Lconsole_struct_cur_column)
>> 3606 movel %a0@(Lconsole_struct_num_columns),%d1
>> 3607 cmpl %d1,%d0
>> 3608 jcs 1f
>> 3609 console_putc #'\n' /* recursion is OK! */
>> 3610 1:
>> 3611 movel %a0@(Lconsole_struct_cur_row),%d1
>> 3612
>> 3613 /*
>> 3614 * At this point we make a shift in register usage
>> 3615 * a0 = address of pointer to font data (fbcon_font_desc)
>> 3616 */
>> 3617 movel %pc@(L(console_font)),%a0
>> 3618 movel %pc@(L(console_font_data)),%a1 /* Load fbcon_font_desc.data into a1 */
>> 3619 andl #0x000000ff,%d7
>> 3620 /* ASSERT: a0 = contents of Lconsole_font */
>> 3621 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */
>> 3622 addl %d7,%a1 /* a1 = points to char image */
>> 3623
>> 3624 /*
>> 3625 * At this point we make a shift in register usage
>> 3626 * d0 = pixel coordinate, x
>> 3627 * d1 = pixel coordinate, y
>> 3628 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen
>> 3629 * d3 = font scan line data (8 pixels)
>> 3630 * d6 = count down for the font's pixel width (8)
>> 3631 * d7 = count down for the font's pixel count in height
>> 3632 */
>> 3633 /* ASSERT: a0 = contents of Lconsole_font */
>> 3634 mulul %a0@(FONT_DESC_WIDTH),%d0
>> 3635 mulul %a0@(FONT_DESC_HEIGHT),%d1
>> 3636 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load fbcon_font_desc.height into d7 */
>> 3637 subq #1,%d7
>> 3638 L(console_read_char_scanline):
>> 3639 moveb %a1@+,%d3
>> 3640
>> 3641 /* ASSERT: a0 = contents of Lconsole_font */
>> 3642 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */
>> 3643 subql #1,%d6
>> 3644
>> 3645 L(console_do_font_scanline):
>> 3646 lslb #1,%d3
>> 3647 scsb %d2 /* convert 1 bit into a byte */
>> 3648 console_plot_pixel %d0,%d1,%d2
>> 3649 addq #1,%d0
>> 3650 dbra %d6,L(console_do_font_scanline)
>> 3651
>> 3652 /* ASSERT: a0 = contents of Lconsole_font */
>> 3653 subl %a0@(FONT_DESC_WIDTH),%d0
>> 3654 addq #1,%d1
>> 3655 dbra %d7,L(console_read_char_scanline)
>> 3656
>> 3657 L(console_exit):
>> 3658 func_return console_putc
>> 3659
>> 3660 /*
>> 3661 * Input:
>> 3662 * d0 = x coordinate
>> 3663 * d1 = y coordinate
>> 3664 * d2 = (bit 0) 1/0 for white/black (!)
>> 3665 * All registers are preserved
>> 3666 */
>> 3667 func_start console_plot_pixel,%a0-%a1/%d0-%d4
>> 3668
>> 3669 movel %pc@(L(mac_videobase)),%a1
>> 3670 movel %pc@(L(mac_videodepth)),%d3
>> 3671 movel ARG1,%d0
>> 3672 movel ARG2,%d1
>> 3673 mulul %pc@(L(mac_rowbytes)),%d1
>> 3674 movel ARG3,%d2
>> 3675
>> 3676 /*
>> 3677 * Register usage:
>> 3678 * d0 = x coord becomes byte offset into frame buffer
>> 3679 * d1 = y coord
>> 3680 * d2 = black or white (0/1)
>> 3681 * d3 = video depth
>> 3682 * d4 = temp of x (d0) for many bit depths
>> 3683 */
>> 3684 L(test_1bit):
>> 3685 cmpb #1,%d3
>> 3686 jbne L(test_2bit)
>> 3687 movel %d0,%d4 /* we need the low order 3 bits! */
>> 3688 divul #8,%d0
>> 3689 addal %d0,%a1
>> 3690 addal %d1,%a1
>> 3691 andb #7,%d4
>> 3692 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3693 andb #1,%d2
>> 3694 jbne L(white_1)
>> 3695 bsetb %d4,%a1@
>> 3696 jbra L(console_plot_pixel_exit)
>> 3697 L(white_1):
>> 3698 bclrb %d4,%a1@
>> 3699 jbra L(console_plot_pixel_exit)
>> 3700
>> 3701 L(test_2bit):
>> 3702 cmpb #2,%d3
>> 3703 jbne L(test_4bit)
>> 3704 movel %d0,%d4 /* we need the low order 2 bits! */
>> 3705 divul #4,%d0
>> 3706 addal %d0,%a1
>> 3707 addal %d1,%a1
>> 3708 andb #3,%d4
>> 3709 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3710 lsll #1,%d4 /* ! */
>> 3711 andb #1,%d2
>> 3712 jbne L(white_2)
>> 3713 bsetb %d4,%a1@
>> 3714 addq #1,%d4
>> 3715 bsetb %d4,%a1@
>> 3716 jbra L(console_plot_pixel_exit)
>> 3717 L(white_2):
>> 3718 bclrb %d4,%a1@
>> 3719 addq #1,%d4
>> 3720 bclrb %d4,%a1@
>> 3721 jbra L(console_plot_pixel_exit)
>> 3722
>> 3723 L(test_4bit):
>> 3724 cmpb #4,%d3
>> 3725 jbne L(test_8bit)
>> 3726 movel %d0,%d4 /* we need the low order bit! */
>> 3727 divul #2,%d0
>> 3728 addal %d0,%a1
>> 3729 addal %d1,%a1
>> 3730 andb #1,%d4
>> 3731 eorb #1,%d4
>> 3732 lsll #2,%d4 /* ! */
>> 3733 andb #1,%d2
>> 3734 jbne L(white_4)
>> 3735 bsetb %d4,%a1@
>> 3736 addq #1,%d4
>> 3737 bsetb %d4,%a1@
>> 3738 addq #1,%d4
>> 3739 bsetb %d4,%a1@
>> 3740 addq #1,%d4
>> 3741 bsetb %d4,%a1@
>> 3742 jbra L(console_plot_pixel_exit)
>> 3743 L(white_4):
>> 3744 bclrb %d4,%a1@
>> 3745 addq #1,%d4
>> 3746 bclrb %d4,%a1@
>> 3747 addq #1,%d4
>> 3748 bclrb %d4,%a1@
>> 3749 addq #1,%d4
>> 3750 bclrb %d4,%a1@
>> 3751 jbra L(console_plot_pixel_exit)
>> 3752
>> 3753 L(test_8bit):
>> 3754 cmpb #8,%d3
>> 3755 jbne L(test_16bit)
>> 3756 addal %d0,%a1
>> 3757 addal %d1,%a1
>> 3758 andb #1,%d2
>> 3759 jbne L(white_8)
>> 3760 moveb #0xff,%a1@
>> 3761 jbra L(console_plot_pixel_exit)
>> 3762 L(white_8):
>> 3763 clrb %a1@
>> 3764 jbra L(console_plot_pixel_exit)
>> 3765
>> 3766 L(test_16bit):
>> 3767 cmpb #16,%d3
>> 3768 jbne L(console_plot_pixel_exit)
>> 3769 addal %d0,%a1
>> 3770 addal %d0,%a1
>> 3771 addal %d1,%a1
>> 3772 andb #1,%d2
>> 3773 jbne L(white_16)
>> 3774 clrw %a1@
>> 3775 jbra L(console_plot_pixel_exit)
>> 3776 L(white_16):
>> 3777 movew #0x0fff,%a1@
>> 3778 jbra L(console_plot_pixel_exit)
>> 3779
>> 3780 L(console_plot_pixel_exit):
>> 3781 func_return console_plot_pixel
>> 3782 #endif /* CONSOLE */
>> 3783
>> 3784 #if 0
>> 3785 /*
>> 3786 * This is some old code lying around. I don't believe
>> 3787 * it's used or important anymore. My guess is it contributed
>> 3788 * to getting to this point, but it's done for now.
>> 3789 * It was still in the 2.1.77 head.S, so it's still here.
>> 3790 * (And still not used!)
>> 3791 */
>> 3792 L(showtest):
>> 3793 moveml %a0/%d7,%sp@-
>> 3794 puts "A="
>> 3795 putn %a1
>> 3796
>> 3797 .long 0xf0119f15 | ptestr #5,%a1@,#7,%a0
>> 3798
>> 3799 puts "DA="
>> 3800 putn %a0
>> 3801
>> 3802 puts "D="
>> 3803 putn %a0@
>> 3804
>> 3805 puts "S="
>> 3806 lea %pc@(L(mmu)),%a0
>> 3807 .long 0xf0106200 | pmove %psr,%a0@
>> 3808 clrl %d7
>> 3809 movew %a0@,%d7
>> 3810 putn %d7
>> 3811
>> 3812 putc '\n'
>> 3813 moveml %sp@+,%a0/%d7
>> 3814 rts
>> 3815 #endif /* 0 */
>> 3816
>> 3817 __INITDATA
>> 3818 .align 4
>> 3819
>> 3820 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
>> 3821 defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3822 L(custom):
>> 3823 L(iobase):
>> 3824 .long 0
>> 3825 #endif
>> 3826
>> 3827 #if defined(CONSOLE)
>> 3828 L(console_globals):
>> 3829 .long 0 /* cursor column */
>> 3830 .long 0 /* cursor row */
>> 3831 .long 0 /* max num columns */
>> 3832 .long 0 /* max num rows */
>> 3833 .long 0 /* left edge */
>> 3834 .long 0 /* mac putc */
>> 3835 L(console_font):
>> 3836 .long 0 /* pointer to console font (struct font_desc) */
>> 3837 L(console_font_data):
>> 3838 .long 0 /* pointer to console font data */
>> 3839 #endif /* CONSOLE */
>> 3840
>> 3841 #if defined(MMU_PRINT)
>> 3842 L(mmu_print_data):
>> 3843 .long 0 /* valid flag */
>> 3844 .long 0 /* start logical */
>> 3845 .long 0 /* next logical */
>> 3846 .long 0 /* start physical */
>> 3847 .long 0 /* next physical */
>> 3848 #endif /* MMU_PRINT */
>> 3849
>> 3850 L(cputype):
>> 3851 .long 0
>> 3852 L(mmu_cached_pointer_tables):
>> 3853 .long 0
>> 3854 L(mmu_num_pointer_tables):
>> 3855 .long 0
>> 3856 L(phys_kernel_start):
>> 3857 .long 0
>> 3858 L(kernel_end):
>> 3859 .long 0
>> 3860 L(memory_start):
>> 3861 .long 0
>> 3862 L(kernel_pgdir_ptr):
>> 3863 .long 0
>> 3864 L(temp_mmap_mem):
>> 3865 .long 0
>> 3866
>> 3867 #if defined (CONFIG_MVME147)
>> 3868 M147_SCC_CTRL_A = 0xfffe3002
>> 3869 M147_SCC_DATA_A = 0xfffe3003
>> 3870 #endif
>> 3871
>> 3872 #if defined (CONFIG_MVME16x)
>> 3873 M162_SCC_CTRL_A = 0xfff45005
>> 3874 M167_CYCAR = 0xfff450ee
>> 3875 M167_CYIER = 0xfff45011
>> 3876 M167_CYLICR = 0xfff45026
>> 3877 M167_CYTEOIR = 0xfff45085
>> 3878 M167_CYTDR = 0xfff450f8
>> 3879 M167_PCSCCTICR = 0xfff4201e
>> 3880 M167_PCTPIACKR = 0xfff42025
>> 3881 #endif
>> 3882
>> 3883 #if defined (CONFIG_BVME6000)
>> 3884 BVME_SCC_CTRL_A = 0xffb0000b
>> 3885 BVME_SCC_DATA_A = 0xffb0000f
>> 3886 #endif
>> 3887
>> 3888 #if defined(CONFIG_MAC)
>> 3889 L(mac_booter_data):
>> 3890 .long 0
>> 3891 L(mac_videobase):
>> 3892 .long 0
>> 3893 L(mac_videodepth):
>> 3894 .long 0
>> 3895 L(mac_dimensions):
>> 3896 .long 0
>> 3897 L(mac_rowbytes):
>> 3898 .long 0
>> 3899 #ifdef MAC_SERIAL_DEBUG
>> 3900 L(mac_sccbase):
>> 3901 .long 0
>> 3902 #endif /* MAC_SERIAL_DEBUG */
>> 3903 #endif
>> 3904
>> 3905 #if defined (CONFIG_APOLLO)
>> 3906 LSRB0 = 0x10412
>> 3907 LTHRB0 = 0x10416
>> 3908 LCPUCTRL = 0x10100
>> 3909 #endif
>> 3910
>> 3911 #if defined(CONFIG_HP300)
>> 3912 DCADATA = 0x11
>> 3913 DCALSR = 0x1b
>> 3914 APCIDATA = 0x00
>> 3915 APCILSR = 0x14
>> 3916 L(uartbase):
>> 3917 .long 0
>> 3918 L(uart_scode):
>> 3919 .long -1
>> 3920 #endif
>> 3921
>> 3922 __FINIT
>> 3923 .data
>> 3924 .align 4
>> 3925
>> 3926 availmem:
>> 3927 .long 0
>> 3928 m68k_pgtable_cachemode:
>> 3929 .long 0
>> 3930 m68k_supervisor_cachemode:
>> 3931 .long 0
>> 3932 #if defined(CONFIG_MVME16x)
>> 3933 mvme_bdid:
>> 3934 .long 0,0,0,0,0,0,0,0
>> 3935 #endif
>> 3936 #if defined(CONFIG_Q40)
>> 3937 q40_mem_cptr:
>> 3938 .long 0
>> 3939 L(q40_do_debug):
>> 3940 .long 0
>> 3941 #endif
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