>> 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 * position 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 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_USE_SCC_A: Use SCC port A (modem) for serial debug and early console.
>> 254 * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug and early console.
29 */ 255 */
30 256
31 #include <linux/init.h> <<
32 #include <linux/linkage.h> 257 #include <linux/linkage.h>
33 #include <asm/thread_info.h> !! 258 #include <linux/init.h>
>> 259 #include <asm/bootinfo.h>
>> 260 #include <asm/setup.h>
>> 261 #include <asm/entry.h>
>> 262 #include <asm/pgtable.h>
34 #include <asm/page.h> 263 #include <asm/page.h>
35 #include <linux/of_fdt.h> /* for !! 264 #include <asm/asm-offsets.h>
>> 265
>> 266 #ifdef CONFIG_MAC
>> 267
>> 268 #include <asm/machw.h>
>> 269
>> 270 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
>> 271 #define CONSOLE
>> 272 #define CONSOLE_PENGUIN
>> 273 #endif
>> 274
>> 275 #ifdef CONFIG_EARLY_PRINTK
>> 276 #define SERIAL_DEBUG
>> 277 #else
>> 278 #undef SERIAL_DEBUG
>> 279 #endif
36 280
37 #include <asm/setup.h> /* COMMAND_LINE_SIZE */ !! 281 #else /* !CONFIG_MAC */
38 #include <asm/mmu.h> !! 282
39 #include <asm/processor.h> !! 283 #define SERIAL_DEBUG
40 !! 284
41 .section .data !! 285 #endif /* !CONFIG_MAC */
42 .global empty_zero_page !! 286
43 .align 12 !! 287 #undef MMU_PRINT
44 empty_zero_page: !! 288 #undef MMU_NOCACHE_KERNEL
45 .space PAGE_SIZE !! 289 #undef DEBUG
46 .global swapper_pg_dir !! 290
47 swapper_pg_dir: !! 291 /*
48 .space PAGE_SIZE !! 292 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
49 !! 293 * The 8x8 font is harder to read but fits more on the screen.
50 .section .rodata !! 294 */
51 .align 4 !! 295 #define FONT_8x8 /* default */
52 endian_check: !! 296 /* #define FONT_8x16 */ /* 2nd choice */
53 .word 1 !! 297 /* #define FONT_6x11 */ /* 3rd choice */
>> 298
>> 299 .globl kernel_pg_dir
>> 300 .globl availmem
>> 301 .globl m68k_pgtable_cachemode
>> 302 .globl m68k_supervisor_cachemode
>> 303 #ifdef CONFIG_MVME16x
>> 304 .globl mvme_bdid
>> 305 #endif
>> 306 #ifdef CONFIG_Q40
>> 307 .globl q40_mem_cptr
>> 308 #endif
>> 309
>> 310 CPUTYPE_040 = 1 /* indicates an 040 */
>> 311 CPUTYPE_060 = 2 /* indicates an 060 */
>> 312 CPUTYPE_0460 = 3 /* if either above are set, this is set */
>> 313 CPUTYPE_020 = 4 /* indicates an 020 */
>> 314
>> 315 /* Translation control register */
>> 316 TC_ENABLE = 0x8000
>> 317 TC_PAGE8K = 0x4000
>> 318 TC_PAGE4K = 0x0000
>> 319
>> 320 /* Transparent translation registers */
>> 321 TTR_ENABLE = 0x8000 /* enable transparent translation */
>> 322 TTR_ANYMODE = 0x4000 /* user and kernel mode access */
>> 323 TTR_KERNELMODE = 0x2000 /* only kernel mode access */
>> 324 TTR_USERMODE = 0x0000 /* only user mode access */
>> 325 TTR_CI = 0x0400 /* inhibit cache */
>> 326 TTR_RW = 0x0200 /* read/write mode */
>> 327 TTR_RWM = 0x0100 /* read/write mask */
>> 328 TTR_FCB2 = 0x0040 /* function code base bit 2 */
>> 329 TTR_FCB1 = 0x0020 /* function code base bit 1 */
>> 330 TTR_FCB0 = 0x0010 /* function code base bit 0 */
>> 331 TTR_FCM2 = 0x0004 /* function code mask bit 2 */
>> 332 TTR_FCM1 = 0x0002 /* function code mask bit 1 */
>> 333 TTR_FCM0 = 0x0001 /* function code mask bit 0 */
>> 334
>> 335 /* Cache Control registers */
>> 336 CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */
>> 337 CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */
>> 338 CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */
>> 339 CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */
>> 340 CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */
>> 341 CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */
>> 342 CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */
>> 343 CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */
>> 344 CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */
>> 345 CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */
>> 346 CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */
>> 347 CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */
>> 348 CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */
>> 349 CC3_CLR_D = 0x00000800 /* clear data cache (68030) */
>> 350 CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */
>> 351 CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */
>> 352 CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */
>> 353 CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */
>> 354 CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */
>> 355 CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */
>> 356 CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */
>> 357 CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */
>> 358
>> 359 /* Miscellaneous definitions */
>> 360 PAGESIZE = 4096
>> 361 PAGESHIFT = 12
>> 362
>> 363 ROOT_TABLE_SIZE = 128
>> 364 PTR_TABLE_SIZE = 128
>> 365 PAGE_TABLE_SIZE = 64
>> 366 ROOT_INDEX_SHIFT = 25
>> 367 PTR_INDEX_SHIFT = 18
>> 368 PAGE_INDEX_SHIFT = 12
>> 369
>> 370 #ifdef DEBUG
>> 371 /* When debugging use readable names for labels */
>> 372 #ifdef __STDC__
>> 373 #define L(name) .head.S.##name
>> 374 #else
>> 375 #define L(name) .head.S./**/name
>> 376 #endif
>> 377 #else
>> 378 #ifdef __STDC__
>> 379 #define L(name) .L##name
>> 380 #else
>> 381 #define L(name) .L/**/name
>> 382 #endif
>> 383 #endif
>> 384
>> 385 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
>> 386 #ifndef __INITDATA
>> 387 #define __INITDATA .data
>> 388 #define __FINIT .previous
>> 389 #endif
>> 390
>> 391 /* Several macros to make the writing of subroutines easier:
>> 392 * - func_start marks the beginning of the routine which setups the frame
>> 393 * register and saves the registers, it also defines another macro
>> 394 * to automatically restore the registers again.
>> 395 * - func_return marks the end of the routine and simply calls the prepared
>> 396 * macro to restore registers and jump back to the caller.
>> 397 * - func_define generates another macro to automatically put arguments
>> 398 * onto the stack call the subroutine and cleanup the stack again.
>> 399 */
>> 400
>> 401 /* Within subroutines these macros can be used to access the arguments
>> 402 * on the stack. With STACK some allocated memory on the stack can be
>> 403 * accessed and ARG0 points to the return address (used by mmu_engage).
>> 404 */
>> 405 #define STACK %a6@(stackstart)
>> 406 #define ARG0 %a6@(4)
>> 407 #define ARG1 %a6@(8)
>> 408 #define ARG2 %a6@(12)
>> 409 #define ARG3 %a6@(16)
>> 410 #define ARG4 %a6@(20)
>> 411
>> 412 .macro func_start name,saveregs,stack=0
>> 413 L(\name):
>> 414 linkw %a6,#-\stack
>> 415 moveml \saveregs,%sp@-
>> 416 .set stackstart,-\stack
>> 417
>> 418 .macro func_return_\name
>> 419 moveml %sp@+,\saveregs
>> 420 unlk %a6
>> 421 rts
>> 422 .endm
>> 423 .endm
>> 424
>> 425 .macro func_return name
>> 426 func_return_\name
>> 427 .endm
>> 428
>> 429 .macro func_call name
>> 430 jbsr L(\name)
>> 431 .endm
>> 432
>> 433 .macro move_stack nr,arg1,arg2,arg3,arg4
>> 434 .if \nr
>> 435 move_stack "(\nr-1)",\arg2,\arg3,\arg4
>> 436 movel \arg1,%sp@-
>> 437 .endif
>> 438 .endm
>> 439
>> 440 .macro func_define name,nr=0
>> 441 .macro \name arg1,arg2,arg3,arg4
>> 442 move_stack \nr,\arg1,\arg2,\arg3,\arg4
>> 443 func_call \name
>> 444 .if \nr
>> 445 lea %sp@(\nr*4),%sp
>> 446 .endif
>> 447 .endm
>> 448 .endm
>> 449
>> 450 func_define mmu_map,4
>> 451 func_define mmu_map_tt,4
>> 452 func_define mmu_fixup_page_mmu_cache,1
>> 453 func_define mmu_temp_map,2
>> 454 func_define mmu_engage
>> 455 func_define mmu_get_root_table_entry,1
>> 456 func_define mmu_get_ptr_table_entry,2
>> 457 func_define mmu_get_page_table_entry,2
>> 458 func_define mmu_print
>> 459 func_define get_new_page
>> 460 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 461 func_define set_leds
>> 462 #endif
>> 463
>> 464 .macro mmu_map_eq arg1,arg2,arg3
>> 465 mmu_map \arg1,\arg1,\arg2,\arg3
>> 466 .endm
>> 467
>> 468 .macro get_bi_record record
>> 469 pea \record
>> 470 func_call get_bi_record
>> 471 addql #4,%sp
>> 472 .endm
>> 473
>> 474 func_define serial_putc,1
>> 475 func_define console_putc,1
>> 476
>> 477 func_define console_init
>> 478 func_define console_put_stats
>> 479 func_define console_put_penguin
>> 480 func_define console_plot_pixel,3
>> 481 func_define console_scroll
>> 482
>> 483 .macro putc ch
>> 484 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 485 pea \ch
>> 486 #endif
>> 487 #ifdef CONSOLE
>> 488 func_call console_putc
>> 489 #endif
>> 490 #ifdef SERIAL_DEBUG
>> 491 func_call serial_putc
>> 492 #endif
>> 493 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 494 addql #4,%sp
>> 495 #endif
>> 496 .endm
>> 497
>> 498 .macro dputc ch
>> 499 #ifdef DEBUG
>> 500 putc \ch
>> 501 #endif
>> 502 .endm
>> 503
>> 504 func_define putn,1
>> 505
>> 506 .macro dputn nr
>> 507 #ifdef DEBUG
>> 508 putn \nr
>> 509 #endif
>> 510 .endm
>> 511
>> 512 .macro puts string
>> 513 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 514 __INITDATA
>> 515 .Lstr\@:
>> 516 .string "\string"
>> 517 __FINIT
>> 518 pea %pc@(.Lstr\@)
>> 519 func_call puts
>> 520 addql #4,%sp
>> 521 #endif
>> 522 .endm
>> 523
>> 524 .macro dputs string
>> 525 #ifdef DEBUG
>> 526 puts "\string"
>> 527 #endif
>> 528 .endm
>> 529
>> 530 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
>> 531 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
>> 532 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
>> 533 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
>> 534 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
>> 535 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
>> 536 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
>> 537 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
>> 538 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
>> 539 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
>> 540 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
>> 541 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
>> 542 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
>> 543
>> 544 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
>> 545 jeq 42f; \
>> 546 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
>> 547 jne lab ;\
>> 548 42:\
>> 549
>> 550 #define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
>> 551 #define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
>> 552 #define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
>> 553 #define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
>> 554 #define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
>> 555 #define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
>> 556 #define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
>> 557
>> 558 /* On the HP300 we use the on-board LEDs for debug output before
>> 559 the console is running. Writing a 1 bit turns the corresponding LED
>> 560 _off_ - on the 340 bit 7 is towards the back panel of the machine. */
>> 561 .macro leds mask
>> 562 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 563 hasnt_leds(.Lled\@)
>> 564 pea \mask
>> 565 func_call set_leds
>> 566 addql #4,%sp
>> 567 .Lled\@:
>> 568 #endif
>> 569 .endm
>> 570
>> 571 __HEAD
>> 572 ENTRY(_stext)
>> 573 /*
>> 574 * Version numbers of the bootinfo interface
>> 575 * The area from _stext to _start will later be used as kernel pointer table
>> 576 */
>> 577 bras 1f /* Jump over bootinfo version numbers */
>> 578
>> 579 .long BOOTINFOV_MAGIC
>> 580 .long MACH_AMIGA, AMIGA_BOOTI_VERSION
>> 581 .long MACH_ATARI, ATARI_BOOTI_VERSION
>> 582 .long MACH_MVME147, MVME147_BOOTI_VERSION
>> 583 .long MACH_MVME16x, MVME16x_BOOTI_VERSION
>> 584 .long MACH_BVME6000, BVME6000_BOOTI_VERSION
>> 585 .long MACH_MAC, MAC_BOOTI_VERSION
>> 586 .long MACH_Q40, Q40_BOOTI_VERSION
>> 587 .long MACH_HP300, HP300_BOOTI_VERSION
>> 588 .long 0
>> 589 1: jra __start
>> 590
>> 591 .equ kernel_pg_dir,_stext
>> 592
>> 593 .equ .,_stext+PAGESIZE
54 594
55 __HEAD <<
56 ENTRY(_start) 595 ENTRY(_start)
57 #if CONFIG_KERNEL_BASE_ADDR == 0 !! 596 jra __start
58 brai TOPHYS(real_start) !! 597 __INIT
59 .org 0x100 !! 598 ENTRY(__start)
60 real_start: !! 599 /*
61 #endif !! 600 * Setup initial stack pointer
62 !! 601 */
63 mts rmsr, r0 !! 602 lea %pc@(_stext),%sp
64 /* Disable stack protection from bootloader */ !! 603
65 mts rslr, r0 !! 604 /*
66 addi r8, r0, 0xFFFFFFFF !! 605 * Record the CPU and machine type.
67 mts rshr, r8 !! 606 */
68 /* !! 607 get_bi_record BI_MACHTYPE
69 * According to Xilinx, msrclr instruction beh !! 608 lea %pc@(m68k_machtype),%a1
70 * if the msrclr instruction is not enabled. W !! 609 movel %a0@,%a1@
71 * if the opcode is available, by issuing msrc !! 610
72 * r8 == 0 - msr instructions are implemented !! 611 get_bi_record BI_FPUTYPE
73 * r8 != 0 - msr instructions are not implemen !! 612 lea %pc@(m68k_fputype),%a1
74 */ !! 613 movel %a0@,%a1@
75 mfs r1, rmsr !! 614
76 msrclr r8, 0 /* clear nothing - just !! 615 get_bi_record BI_MMUTYPE
77 cmpu r8, r8, r1 /* r1 must contain !! 616 lea %pc@(m68k_mmutype),%a1
78 !! 617 movel %a0@,%a1@
79 /* r7 may point to an FDT, or there may be one !! 618
80 if it's in r7, we've got to save it away AS !! 619 get_bi_record BI_CPUTYPE
81 We ensure r7 points to a valid FDT, just in !! 620 lea %pc@(m68k_cputype),%a1
82 is broken or non-existent */ !! 621 movel %a0@,%a1@
83 beqi r7, no_fdt_arg !! 622
84 /* Does r7 point to a valid FDT? Load HEADER m !! 623 leds 0x1
85 /* Run time Big/Little endian platform !! 624
86 /* Save 1 as word and load byte - 0 - !! 625 #ifdef CONFIG_MAC
87 lbui r11, r0, TOPHYS(endian_check) !! 626 /*
88 beqid r11, big_endian /* DO NOT brea !! 627 * For Macintosh, we need to determine the display parameters early (at least
89 lw r11, r0, r7 /* Big endian load !! 628 * while debugging it).
90 lwr r11, r0, r7 /* Little endian l !! 629 */
91 big_endian: !! 630
92 rsubi r11, r11, OF_DT_HEADER /* Che !! 631 is_not_mac(L(test_notmac))
93 beqi r11, _prepare_copy_fdt !! 632
94 or r7, r0, r0 /* cle !! 633 get_bi_record BI_MAC_VADDR
95 bnei r11, no_fdt_arg !! 634 lea %pc@(L(mac_videobase)),%a1
96 _prepare_copy_fdt: !! 635 movel %a0@,%a1@
97 or r11, r0, r0 /* incremment */ !! 636
98 ori r4, r0, TOPHYS(_fdt_start) !! 637 get_bi_record BI_MAC_VDEPTH
99 ori r3, r0, (0x10000 - 4) !! 638 lea %pc@(L(mac_videodepth)),%a1
100 _copy_fdt: !! 639 movel %a0@,%a1@
101 lw r12, r7, r11 /* r12 = r7 + r11 !! 640
102 sw r12, r4, r11 /* addr[r4 + r11] !! 641 get_bi_record BI_MAC_VDIM
103 addik r11, r11, 4 /* increment count !! 642 lea %pc@(L(mac_dimensions)),%a1
104 bgtid r3, _copy_fdt /* loop for all !! 643 movel %a0@,%a1@
105 addik r3, r3, -4 /* descrement loop !! 644
106 no_fdt_arg: !! 645 get_bi_record BI_MAC_VROW
107 !! 646 lea %pc@(L(mac_rowbytes)),%a1
108 #ifndef CONFIG_CMDLINE_BOOL !! 647 movel %a0@,%a1@
109 /* !! 648
110 * handling command line !! 649 #ifdef SERIAL_DEBUG
111 * copy command line directly to cmd_line plac !! 650 get_bi_record BI_MAC_SCCBASE
112 */ !! 651 lea %pc@(L(mac_sccbase)),%a1
113 beqid r5, skip /* Skip if NUL !! 652 movel %a0@,%a1@
114 or r11, r0, r0 /* inc !! 653 #endif
115 ori r4, r0, cmd_line /* loa !! 654
116 tophys(r4,r4) /* con !! 655 #if 0
117 ori r3, r0, COMMAND_LINE_SIZE - 1 !! 656 /*
118 _copy_command_line: !! 657 * Clear the screen
119 /* r2=r5+r11 - r5 contain pointer to c !! 658 */
120 lbu r2, r5, r11 !! 659 lea %pc@(L(mac_videobase)),%a0
121 beqid r2, skip /* Ski !! 660 movel %a0@,%a1
122 sb r2, r4, r11 /* add !! 661 lea %pc@(L(mac_dimensions)),%a0
123 addik r11, r11, 1 /* inc !! 662 movel %a0@,%d1
124 bgtid r3, _copy_command_line /* loo !! 663 swap %d1 /* #rows is high bytes */
125 addik r3, r3, -1 /* dec !! 664 andl #0xFFFF,%d1 /* rows */
126 addik r5, r4, 0 /* add !! 665 subl #10,%d1
127 tovirt(r5,r5) !! 666 lea %pc@(L(mac_rowbytes)),%a0
128 skip: !! 667 loopy2:
129 #endif /* CONFIG_CMDLINE_BOOL */ !! 668 movel %a0@,%d0
130 !! 669 subql #1,%d0
131 #ifdef NOT_COMPILE !! 670 loopx2:
132 /* save bram context */ !! 671 moveb #0x55, %a1@+
133 or r11, r0, r0 !! 672 dbra %d0,loopx2
134 ori r4, r0, TOPHYS(_bram_load_star !! 673 dbra %d1,loopy2
135 ori r3, r0, (LMB_SIZE - 4) !! 674 #endif
136 _copy_bram: !! 675
137 lw r7, r0, r11 /* r7 !! 676 L(test_notmac):
138 sw r7, r4, r11 /* add !! 677 #endif /* CONFIG_MAC */
139 addik r11, r11, 4 /* inc !! 678
140 bgtid r3, _copy_bram /* loo !! 679
141 addik r3, r3, -4 /* des !! 680 /*
142 #endif !! 681 * There are ultimately two pieces of information we want for all kinds of
143 /* We have to turn on the MMU right aw !! 682 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter
144 !! 683 * and is converted here from a booter type definition to a separate bit
145 /* !! 684 * number which allows for the standard is_0x0 macro tests.
146 * Set up the initial MMU state so we !! 685 */
147 * kernel initialization. This maps t !! 686 movel %pc@(m68k_cputype),%d0
148 * virtual to physical. !! 687 /*
149 */ !! 688 * Assume it's an 030
150 nop !! 689 */
151 addik r3, r0, MICROBLAZE_TLB_SIZE -1 !! 690 clrl %d1
152 _invalidate: !! 691
153 mts rtlbx, r3 !! 692 /*
154 mts rtlbhi, r0 !! 693 * Test the BootInfo cputype for 060
155 mts rtlblo, r0 !! 694 */
156 bgtid r3, _invalidate /* loo !! 695 btst #CPUB_68060,%d0
157 addik r3, r3, -1 !! 696 jeq 1f
158 /* sync */ !! 697 bset #CPUTYPE_060,%d1
159 !! 698 bset #CPUTYPE_0460,%d1
160 /* Setup the kernel PID */ !! 699 jra 3f
161 mts rpid,r0 /* Loa !! 700 1:
162 nop !! 701 /*
163 bri 4 !! 702 * Test the BootInfo cputype for 040
164 !! 703 */
165 /* !! 704 btst #CPUB_68040,%d0
166 * We should still be executing code a !! 705 jeq 2f
167 * RAM_BASEADDR at this point. However !! 706 bset #CPUTYPE_040,%d1
168 * a virtual address. So, set up a TLB !! 707 bset #CPUTYPE_0460,%d1
169 * translation is enabled. !! 708 jra 3f
170 */ !! 709 2:
171 !! 710 /*
172 addik r3,r0, CONFIG_KERNEL_START /* !! 711 * Test the BootInfo cputype for 020
173 tophys(r4,r3) /* Loa !! 712 */
174 !! 713 btst #CPUB_68020,%d0
175 /* start to do TLB calculation */ !! 714 jeq 3f
176 addik r12, r0, _end !! 715 bset #CPUTYPE_020,%d1
177 rsub r12, r3, r12 !! 716 jra 3f
178 addik r12, r12, CONFIG_LOWMEM_SIZE > !! 717 3:
179 !! 718 /*
180 or r9, r0, r0 /* TLB0 = 0 */ !! 719 * Record the cpu type
181 or r10, r0, r0 /* TLB1 = 0 */ !! 720 */
182 !! 721 lea %pc@(L(cputype)),%a0
183 addik r11, r12, -0x1000000 !! 722 movel %d1,%a0@
184 bgei r11, GT16 /* size is greater t !! 723
185 addik r11, r12, -0x0800000 !! 724 /*
186 bgei r11, GT8 /* size is greater th !! 725 * NOTE:
187 addik r11, r12, -0x0400000 !! 726 *
188 bgei r11, GT4 /* size is greater th !! 727 * Now the macros are valid:
189 /* size is less than 4MB */ !! 728 * is_040_or_060
190 addik r11, r12, -0x0200000 !! 729 * is_not_040_or_060
191 bgei r11, GT2 /* size is greater th !! 730 * is_040
192 addik r9, r0, 0x0100000 /* TLB0 must !! 731 * is_060
193 addik r11, r12, -0x0100000 !! 732 * is_not_060
194 bgei r11, GT1 /* size is greater th !! 733 */
195 /* TLB1 is 0 which is setup above */ !! 734
196 bri tlb_end !! 735 /*
197 GT4: /* r11 contains the rest - will be either !! 736 * Determine the cache mode for pages holding MMU tables
198 ori r9, r0, 0x400000 /* TLB0 is 4MB */ !! 737 * and for supervisor mode, unused for '020 and '030
199 bri TLB1 !! 738 */
200 GT16: /* TLB0 is 16MB */ !! 739 clrl %d0
201 addik r9, r0, 0x1000000 /* means TLB !! 740 clrl %d1
202 TLB1: !! 741
203 /* must be used r2 because of subtract !! 742 is_not_040_or_060(L(save_cachetype))
204 addik r2, r11, -0x0400000 !! 743
205 bgei r2, GT20 /* size is greater th !! 744 /*
206 /* size is >16MB and <20MB */ !! 745 * '040 or '060
207 addik r11, r11, -0x0100000 !! 746 * d1 := cacheable write-through
208 bgei r11, GT17 /* size is greater t !! 747 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
209 /* kernel is >16MB and < 17MB */ !! 748 * but we have been using write-through since at least 2.0.29 so I
210 GT1: !! 749 * guess it is OK.
211 addik r10, r0, 0x0100000 /* means TL !! 750 */
212 bri tlb_end !! 751 #ifdef CONFIG_060_WRITETHROUGH
213 GT2: /* TLB0 is 0 and TLB1 will be 4MB */ !! 752 /*
214 GT17: /* TLB1 is 4MB - kernel size <20MB */ !! 753 * If this is a 68060 board using drivers with cache coherency
215 addik r10, r0, 0x0400000 /* means TL !! 754 * problems, then supervisor memory accesses need to be write-through
216 bri tlb_end !! 755 * also; otherwise, we want copyback.
217 GT8: /* TLB0 is still zero that's why I can us !! 756 */
218 GT20: /* TLB1 is 16MB - kernel size >20MB */ !! 757
219 addik r10, r0, 0x1000000 /* means TL !! 758 is_not_060(1f)
220 tlb_end: !! 759 movel #_PAGE_CACHE040W,%d0
221 !! 760 jra L(save_cachetype)
222 /* !! 761 #endif /* CONFIG_060_WRITETHROUGH */
223 * Configure and load two entries into !! 762 1:
224 * In case we are pinning TLBs, these !! 763 movew #_PAGE_CACHE040,%d0
225 * other TLB functions. If not reserv !! 764
226 * matter where they are loaded. !! 765 movel #_PAGE_CACHE040W,%d1
227 */ !! 766
228 andi r4,r4,0xfffffc00 /* Mas !! 767 L(save_cachetype):
229 ori r4,r4,(TLB_WR | TLB_EX) /* Set !! 768 /* Save cache mode for supervisor mode and page tables
230 !! 769 */
231 /* !! 770 lea %pc@(m68k_supervisor_cachemode),%a0
232 * TLB0 is always used - check if is n !! 771 movel %d0,%a0@
233 * if is use TLB1 value and clear it ( !! 772 lea %pc@(m68k_pgtable_cachemode),%a0
234 */ !! 773 movel %d1,%a0@
235 bnei r9, tlb0_not_zero !! 774
236 add r9, r10, r0 !! 775 /*
237 add r10, r0, r0 !! 776 * raise interrupt level
238 tlb0_not_zero: !! 777 */
239 !! 778 movew #0x2700,%sr
240 /* look at the code below */ !! 779
241 ori r30, r0, 0x200 !! 780 /*
242 andi r29, r9, 0x100000 !! 781 If running on an Atari, determine the I/O base of the
243 bneid r29, 1f !! 782 serial port and test if we are running on a Medusa or Hades.
244 addik r30, r30, 0x80 !! 783 This test is necessary here, because on the Hades the serial
245 andi r29, r9, 0x400000 !! 784 port is only accessible in the high I/O memory area.
246 bneid r29, 1f !! 785
247 addik r30, r30, 0x80 !! 786 The test whether it is a Medusa is done by writing to the byte at
248 andi r29, r9, 0x1000000 !! 787 phys. 0x0. This should result in a bus error on all other machines.
249 bneid r29, 1f !! 788
250 addik r30, r30, 0x80 !! 789 ...should, but doesn't. The Afterburner040 for the Falcon has the
251 1: !! 790 same behaviour (0x0..0x7 are no ROM shadow). So we have to do
252 andi r3,r3,0xfffffc00 /* Mas !! 791 another test to distinguish Medusa and AB040. This is a
253 ori r3,r3,(TLB_VALID) !! 792 read attempt for 0x00ff82fe phys. that should bus error on a Falcon
254 or r3, r3, r30 !! 793 (+AB040), but is in the range where the Medusa always asserts DTACK.
255 !! 794
256 /* Load tlb_skip size value which is i !! 795 The test for the Hades is done by reading address 0xb0000000. This
257 lwi r11, r0, TOPHYS(tlb_skip) !! 796 should give a bus error on the Medusa.
258 mts rtlbx,r11 /* TLB !! 797 */
259 !! 798
260 mts rtlblo,r4 /* Loa !! 799 #ifdef CONFIG_ATARI
261 mts rtlbhi,r3 /* Loa !! 800 is_not_atari(L(notypetest))
262 !! 801
263 /* Increase tlb_skip size */ !! 802 /* get special machine type (Medusa/Hades/AB40) */
264 addik r11, r11, 1 !! 803 moveq #0,%d3 /* default if tag doesn't exist */
265 swi r11, r0, TOPHYS(tlb_skip) !! 804 get_bi_record BI_ATARI_MCH_TYPE
266 !! 805 tstl %d0
267 /* TLB1 can be zeroes that's why we no !! 806 jbmi 1f
268 beqi r10, jump_over2 !! 807 movel %a0@,%d3
269 !! 808 lea %pc@(atari_mch_type),%a0
270 /* look at the code below */ !! 809 movel %d3,%a0@
271 ori r30, r0, 0x200 !! 810 1:
272 andi r29, r10, 0x100000 !! 811 /* On the Hades, the iobase must be set up before opening the
273 bneid r29, 1f !! 812 * serial port. There are no I/O regs at 0x00ffxxxx at all. */
274 addik r30, r30, 0x80 !! 813 moveq #0,%d0
275 andi r29, r10, 0x400000 !! 814 cmpl #ATARI_MACH_HADES,%d3
276 bneid r29, 1f !! 815 jbne 1f
277 addik r30, r30, 0x80 !! 816 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */
278 andi r29, r10, 0x1000000 !! 817 1: lea %pc@(L(iobase)),%a0
279 bneid r29, 1f !! 818 movel %d0,%a0@
280 addik r30, r30, 0x80 !! 819
281 1: !! 820 L(notypetest):
282 addk r4, r4, r9 /* previous ad !! 821 #endif
283 addk r3, r3, r9 !! 822
284 !! 823 #ifdef CONFIG_VME
285 andi r3,r3,0xfffffc00 /* Mas !! 824 is_mvme147(L(getvmetype))
286 ori r3,r3,(TLB_VALID) !! 825 is_bvme6000(L(getvmetype))
287 or r3, r3, r30 !! 826 is_not_mvme16x(L(gvtdone))
288 !! 827
289 lwi r11, r0, TOPHYS(tlb_skip) !! 828 /* See if the loader has specified the BI_VME_TYPE tag. Recent
290 mts rtlbx, r11 /* r11 !! 829 * versions of VMELILO and TFTPLILO do this. We have to do this
291 !! 830 * early so we know how to handle console output. If the tag
292 mts rtlblo,r4 /* Loa !! 831 * doesn't exist then we use the Bug for output on MVME16x.
293 mts rtlbhi,r3 /* Loa !! 832 */
294 !! 833 L(getvmetype):
295 /* Increase tlb_skip size */ !! 834 get_bi_record BI_VME_TYPE
296 addik r11, r11, 1 !! 835 tstl %d0
297 swi r11, r0, TOPHYS(tlb_skip) !! 836 jbmi 1f
298 !! 837 movel %a0@,%d3
299 jump_over2: !! 838 lea %pc@(vme_brdtype),%a0
300 /* !! 839 movel %d3,%a0@
301 * Load a TLB entry for LMB, since we !! 840 1:
302 * the exception vectors, using a 4k r !! 841 #ifdef CONFIG_MVME16x
303 */ !! 842 is_not_mvme16x(L(gvtdone))
304 /* Use temporary TLB_ID for LMB - clea !! 843
305 ori r11, r0, MICROBLAZE_LMB_TLB_ID !! 844 /* Need to get the BRD_ID info to differentiate between 162, 167,
306 mts rtlbx,r11 !! 845 * etc. This is available as a BI_VME_BRDINFO tag with later
307 !! 846 * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
308 ori r4,r0,(TLB_WR | TLB_EX) !! 847 */
309 ori r3,r0,(TLB_VALID | TLB_PAGESZ( !! 848 get_bi_record BI_VME_BRDINFO
310 !! 849 tstl %d0
311 mts rtlblo,r4 /* Loa !! 850 jpl 1f
312 mts rtlbhi,r3 /* Loa !! 851
313 !! 852 /* Get pointer to board ID data from Bug */
314 /* !! 853 movel %d2,%sp@-
315 * We now have the lower 16 Meg of RAM !! 854 trap #15
316 * caches ready to work. !! 855 .word 0x70 /* trap 0x70 - .BRD_ID */
317 */ !! 856 movel %sp@+,%a0
318 turn_on_mmu: !! 857 1:
319 ori r15,r0,start_here !! 858 lea %pc@(mvme_bdid),%a1
320 ori r4,r0,MSR_KERNEL_VMS !! 859 /* Structure is 32 bytes long */
321 mts rmsr,r4 !! 860 movel %a0@+,%a1@+
322 nop !! 861 movel %a0@+,%a1@+
323 rted r15,0 /* ena !! 862 movel %a0@+,%a1@+
324 nop !! 863 movel %a0@+,%a1@+
325 !! 864 movel %a0@+,%a1@+
326 start_here: !! 865 movel %a0@+,%a1@+
327 !! 866 movel %a0@+,%a1@+
328 /* Initialize small data anchors */ !! 867 movel %a0@+,%a1@+
329 addik r13, r0, _KERNEL_SDA_BASE_ !! 868 #endif
330 addik r2, r0, _KERNEL_SDA2_BASE_ !! 869
331 !! 870 L(gvtdone):
332 /* Initialize stack pointer */ !! 871
333 addik r1, r0, init_thread_union + TH !! 872 #endif
334 !! 873
335 /* Initialize r31 with current task ad !! 874 #ifdef CONFIG_HP300
336 addik r31, r0, init_task !! 875 is_not_hp300(L(nothp))
337 !! 876
338 addik r11, r0, machine_early_init !! 877 /* Get the address of the UART for serial debugging */
339 brald r15, r11 !! 878 get_bi_record BI_HP300_UART_ADDR
340 nop !! 879 tstl %d0
341 !! 880 jbmi 1f
342 /* !! 881 movel %a0@,%d3
343 * Initialize the MMU. !! 882 lea %pc@(L(uartbase)),%a0
344 */ !! 883 movel %d3,%a0@
345 bralid r15, mmu_init !! 884 get_bi_record BI_HP300_UART_SCODE
346 nop !! 885 tstl %d0
347 !! 886 jbmi 1f
348 /* Go back to running unmapped so we c !! 887 movel %a0@,%d3
349 * and change to using our exception v !! 888 lea %pc@(L(uart_scode)),%a0
350 * On the MicroBlaze, all we invalidat !! 889 movel %d3,%a0@
351 * the old 16M byte TLB mappings. !! 890 1:
352 */ !! 891 L(nothp):
353 ori r15,r0,TOPHYS(kernel_load_cont !! 892 #endif
354 ori r4,r0,MSR_KERNEL !! 893
355 mts rmsr,r4 !! 894 /*
356 nop !! 895 * Initialize serial port
357 bri 4 !! 896 */
358 rted r15,0 !! 897 jbsr L(serial_init)
359 nop !! 898
360 !! 899 /*
361 /* Load up the kernel context */ !! 900 * Initialize console
362 kernel_load_context: !! 901 */
363 ori r5, r0, MICROBLAZE_LMB_TLB_ID !! 902 #ifdef CONFIG_MAC
364 mts rtlbx,r5 !! 903 is_not_mac(L(nocon))
365 nop !! 904 #ifdef CONSOLE
366 mts rtlbhi,r0 !! 905 console_init
367 nop !! 906 #ifdef CONSOLE_PENGUIN
368 addi r15, r0, machine_halt !! 907 console_put_penguin
369 ori r17, r0, start_kernel !! 908 #endif /* CONSOLE_PENGUIN */
370 ori r4, r0, MSR_KERNEL_VMS !! 909 console_put_stats
371 mts rmsr, r4 !! 910 #endif /* CONSOLE */
>> 911 L(nocon):
>> 912 #endif /* CONFIG_MAC */
>> 913
>> 914
>> 915 putc '\n'
>> 916 putc 'A'
>> 917 leds 0x2
>> 918 dputn %pc@(L(cputype))
>> 919 dputn %pc@(m68k_supervisor_cachemode)
>> 920 dputn %pc@(m68k_pgtable_cachemode)
>> 921 dputc '\n'
>> 922
>> 923 /*
>> 924 * Save physical start address of kernel
>> 925 */
>> 926 lea %pc@(L(phys_kernel_start)),%a0
>> 927 lea %pc@(_stext),%a1
>> 928 subl #_stext,%a1
>> 929 addl #PAGE_OFFSET,%a1
>> 930 movel %a1,%a0@
>> 931
>> 932 putc 'B'
>> 933
>> 934 leds 0x4
>> 935
>> 936 /*
>> 937 * mmu_init
>> 938 *
>> 939 * This block of code does what's necessary to map in the various kinds
>> 940 * of machines for execution of Linux.
>> 941 * First map the first 4 MB of kernel code & data
>> 942 */
>> 943
>> 944 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\
>> 945 %pc@(m68k_supervisor_cachemode)
>> 946
>> 947 putc 'C'
>> 948
>> 949 #ifdef CONFIG_AMIGA
>> 950
>> 951 L(mmu_init_amiga):
>> 952
>> 953 is_not_amiga(L(mmu_init_not_amiga))
>> 954 /*
>> 955 * mmu_init_amiga
>> 956 */
>> 957
>> 958 putc 'D'
>> 959
>> 960 is_not_040_or_060(1f)
>> 961
>> 962 /*
>> 963 * 040: Map the 16Meg range physical 0x0 up to logical 0x8000.0000
>> 964 */
>> 965 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 966 /*
>> 967 * Map the Zorro III I/O space with transparent translation
>> 968 * for frame buffer memory etc.
>> 969 */
>> 970 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
>> 971
>> 972 jbra L(mmu_init_done)
>> 973
>> 974 1:
>> 975 /*
>> 976 * 030: Map the 32Meg range physical 0x0 up to logical 0x8000.0000
>> 977 */
>> 978 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 979 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
>> 980
>> 981 jbra L(mmu_init_done)
>> 982
>> 983 L(mmu_init_not_amiga):
>> 984 #endif
>> 985
>> 986 #ifdef CONFIG_ATARI
>> 987
>> 988 L(mmu_init_atari):
>> 989
>> 990 is_not_atari(L(mmu_init_not_atari))
>> 991
>> 992 putc 'E'
>> 993
>> 994 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
>> 995 the last 16 MB of virtual address space to the first 16 MB (i.e.
>> 996 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
>> 997 needed. I/O ranges are marked non-cachable.
>> 998
>> 999 For the Medusa it is better to map the I/O region transparently
>> 1000 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
>> 1001 accessible only in the high area.
>> 1002
>> 1003 On the Hades all I/O registers are only accessible in the high
>> 1004 area.
>> 1005 */
>> 1006
>> 1007 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
>> 1008 moveq #0,%d0
>> 1009 movel %pc@(atari_mch_type),%d3
>> 1010 cmpl #ATARI_MACH_MEDUSA,%d3
>> 1011 jbeq 2f
>> 1012 cmpl #ATARI_MACH_HADES,%d3
>> 1013 jbne 1f
>> 1014 2: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
>> 1015 1: movel %d0,%d3
>> 1016
>> 1017 is_040_or_060(L(spata68040))
>> 1018
>> 1019 /* Map everything non-cacheable, though not all parts really
>> 1020 * need to disable caches (crucial only for 0xff8000..0xffffff
>> 1021 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
>> 1022 * isn't really used, except for sometimes peeking into the
>> 1023 * ROMs (mirror at phys. 0x0), so caching isn't necessary for
>> 1024 * this. */
>> 1025 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
>> 1026
>> 1027 jbra L(mmu_init_done)
>> 1028
>> 1029 L(spata68040):
>> 1030
>> 1031 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
>> 1032
>> 1033 jbra L(mmu_init_done)
>> 1034
>> 1035 L(mmu_init_not_atari):
>> 1036 #endif
>> 1037
>> 1038 #ifdef CONFIG_Q40
>> 1039 is_not_q40(L(notq40))
>> 1040 /*
>> 1041 * add transparent mapping for 0xff00 0000 - 0xffff ffff
>> 1042 * non-cached serialized etc..
>> 1043 * this includes master chip, DAC, RTC and ISA ports
>> 1044 * 0xfe000000-0xfeffffff is for screen and ROM
>> 1045 */
>> 1046
>> 1047 putc 'Q'
>> 1048
>> 1049 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
>> 1050 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1051
>> 1052 jbra L(mmu_init_done)
>> 1053
>> 1054 L(notq40):
>> 1055 #endif
>> 1056
>> 1057 #ifdef CONFIG_HP300
>> 1058 is_not_hp300(L(nothp300))
>> 1059
>> 1060 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
>> 1061 * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx).
>> 1062 * The ROM mapping is needed because the LEDs are mapped there too.
>> 1063 */
>> 1064
>> 1065 is_040(1f)
>> 1066
>> 1067 /*
>> 1068 * 030: Map the 32Meg range physical 0x0 up to logical 0xf000.0000
>> 1069 */
>> 1070 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1071
>> 1072 jbra L(mmu_init_done)
>> 1073
>> 1074 1:
>> 1075 /*
>> 1076 * 040: Map the 16Meg range physical 0x0 up to logical 0xf000.0000
>> 1077 */
>> 1078 mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 1079
>> 1080 jbra L(mmu_init_done)
>> 1081
>> 1082 L(nothp300):
>> 1083 #endif /* CONFIG_HP300 */
>> 1084
>> 1085 #ifdef CONFIG_MVME147
>> 1086
>> 1087 is_not_mvme147(L(not147))
>> 1088
>> 1089 /*
>> 1090 * On MVME147 we have already created kernel page tables for
>> 1091 * 4MB of RAM at address 0, so now need to do a transparent
>> 1092 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1093 * so we can access on-board i/o areas.
>> 1094 */
>> 1095
>> 1096 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
>> 1097
>> 1098 jbra L(mmu_init_done)
>> 1099
>> 1100 L(not147):
>> 1101 #endif /* CONFIG_MVME147 */
>> 1102
>> 1103 #ifdef CONFIG_MVME16x
>> 1104
>> 1105 is_not_mvme16x(L(not16x))
>> 1106
>> 1107 /*
>> 1108 * On MVME16x we have already created kernel page tables for
>> 1109 * 4MB of RAM at address 0, so now need to do a transparent
>> 1110 * mapping of the top of memory space. Make it 0.5GByte for now.
>> 1111 * Supervisor only access, so transparent mapping doesn't
>> 1112 * clash with User code virtual address space.
>> 1113 * this covers IO devices, PROM and SRAM. The PROM and SRAM
>> 1114 * mapping is needed to allow 167Bug to run.
>> 1115 * IO is in the range 0xfff00000 to 0xfffeffff.
>> 1116 * PROM is 0xff800000->0xffbfffff and SRAM is
>> 1117 * 0xffe00000->0xffe1ffff.
>> 1118 */
>> 1119
>> 1120 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1121
>> 1122 jbra L(mmu_init_done)
>> 1123
>> 1124 L(not16x):
>> 1125 #endif /* CONFIG_MVME162 | CONFIG_MVME167 */
>> 1126
>> 1127 #ifdef CONFIG_BVME6000
>> 1128
>> 1129 is_not_bvme6000(L(not6000))
>> 1130
>> 1131 /*
>> 1132 * On BVME6000 we have already created kernel page tables for
>> 1133 * 4MB of RAM at address 0, so now need to do a transparent
>> 1134 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1135 * so we can access on-board i/o areas.
>> 1136 * Supervisor only access, so transparent mapping doesn't
>> 1137 * clash with User code virtual address space.
>> 1138 */
>> 1139
>> 1140 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1141
>> 1142 jbra L(mmu_init_done)
>> 1143
>> 1144 L(not6000):
>> 1145 #endif /* CONFIG_BVME6000 */
>> 1146
>> 1147 /*
>> 1148 * mmu_init_mac
>> 1149 *
>> 1150 * The Macintosh mappings are less clear.
>> 1151 *
>> 1152 * Even as of this writing, it is unclear how the
>> 1153 * Macintosh mappings will be done. However, as
>> 1154 * the first author of this code I'm proposing the
>> 1155 * following model:
>> 1156 *
>> 1157 * Map the kernel (that's already done),
>> 1158 * Map the I/O (on most machines that's the
>> 1159 * 0x5000.0000 ... 0x5300.0000 range,
>> 1160 * Map the video frame buffer using as few pages
>> 1161 * as absolutely (this requirement mostly stems from
>> 1162 * the fact that when the frame buffer is at
>> 1163 * 0x0000.0000 then we know there is valid RAM just
>> 1164 * above the screen that we don't want to waste!).
>> 1165 *
>> 1166 * By the way, if the frame buffer is at 0x0000.0000
>> 1167 * then the Macintosh is known as an RBV based Mac.
>> 1168 *
>> 1169 * By the way 2, the code currently maps in a bunch of
>> 1170 * regions. But I'd like to cut that out. (And move most
>> 1171 * of the mappings up into the kernel proper ... or only
>> 1172 * map what's necessary.)
>> 1173 */
>> 1174
>> 1175 #ifdef CONFIG_MAC
>> 1176
>> 1177 L(mmu_init_mac):
>> 1178
>> 1179 is_not_mac(L(mmu_init_not_mac))
>> 1180
>> 1181 putc 'F'
>> 1182
>> 1183 is_not_040_or_060(1f)
>> 1184
>> 1185 moveq #_PAGE_NOCACHE_S,%d3
>> 1186 jbra 2f
>> 1187 1:
>> 1188 moveq #_PAGE_NOCACHE030,%d3
>> 1189 2:
>> 1190 /*
>> 1191 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
>> 1192 * we simply map the 4MB that contains the videomem
>> 1193 */
>> 1194
>> 1195 movel #VIDEOMEMMASK,%d0
>> 1196 andl %pc@(L(mac_videobase)),%d0
>> 1197
>> 1198 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
>> 1199 /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */
>> 1200 mmu_map_eq #0x40000000,#0x02000000,%d3
>> 1201 /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
>> 1202 mmu_map_eq #0x50000000,#0x03000000,%d3
>> 1203 /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
>> 1204 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3
>> 1205
>> 1206 jbra L(mmu_init_done)
>> 1207
>> 1208 L(mmu_init_not_mac):
>> 1209 #endif
>> 1210
>> 1211 #ifdef CONFIG_SUN3X
>> 1212 is_not_sun3x(L(notsun3x))
>> 1213
>> 1214 /* oh, the pain.. We're gonna want the prom code after
>> 1215 * starting the MMU, so we copy the mappings, translating
>> 1216 * from 8k -> 4k pages as we go.
>> 1217 */
>> 1218
>> 1219 /* copy maps from 0xfee00000 to 0xff000000 */
>> 1220 movel #0xfee00000, %d0
>> 1221 moveq #ROOT_INDEX_SHIFT, %d1
>> 1222 lsrl %d1,%d0
>> 1223 mmu_get_root_table_entry %d0
>> 1224
>> 1225 movel #0xfee00000, %d0
>> 1226 moveq #PTR_INDEX_SHIFT, %d1
>> 1227 lsrl %d1,%d0
>> 1228 andl #PTR_TABLE_SIZE-1, %d0
>> 1229 mmu_get_ptr_table_entry %a0,%d0
>> 1230
>> 1231 movel #0xfee00000, %d0
>> 1232 moveq #PAGE_INDEX_SHIFT, %d1
>> 1233 lsrl %d1,%d0
>> 1234 andl #PAGE_TABLE_SIZE-1, %d0
>> 1235 mmu_get_page_table_entry %a0,%d0
>> 1236
>> 1237 /* this is where the prom page table lives */
>> 1238 movel 0xfefe00d4, %a1
>> 1239 movel %a1@, %a1
>> 1240
>> 1241 movel #((0x200000 >> 13)-1), %d1
>> 1242
>> 1243 1:
>> 1244 movel %a1@+, %d3
>> 1245 movel %d3,%a0@+
>> 1246 addl #0x1000,%d3
>> 1247 movel %d3,%a0@+
>> 1248
>> 1249 dbra %d1,1b
>> 1250
>> 1251 /* setup tt1 for I/O */
>> 1252 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
>> 1253 jbra L(mmu_init_done)
>> 1254
>> 1255 L(notsun3x):
>> 1256 #endif
>> 1257
>> 1258 #ifdef CONFIG_APOLLO
>> 1259 is_not_apollo(L(notapollo))
>> 1260
>> 1261 putc 'P'
>> 1262 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1263
>> 1264 L(notapollo):
>> 1265 jbra L(mmu_init_done)
>> 1266 #endif
>> 1267
>> 1268 L(mmu_init_done):
>> 1269
>> 1270 putc 'G'
>> 1271 leds 0x8
>> 1272
>> 1273 /*
>> 1274 * mmu_fixup
>> 1275 *
>> 1276 * On the 040 class machines, all pages that are used for the
>> 1277 * mmu have to be fixed up. According to Motorola, pages holding mmu
>> 1278 * tables should be non-cacheable on a '040 and write-through on a
>> 1279 * '060. But analysis of the reasons for this, and practical
>> 1280 * experience, showed that write-through also works on a '040.
>> 1281 *
>> 1282 * Allocated memory so far goes from kernel_end to memory_start that
>> 1283 * is used for all kind of tables, for that the cache attributes
>> 1284 * are now fixed.
>> 1285 */
>> 1286 L(mmu_fixup):
>> 1287
>> 1288 is_not_040_or_060(L(mmu_fixup_done))
>> 1289
>> 1290 #ifdef MMU_NOCACHE_KERNEL
>> 1291 jbra L(mmu_fixup_done)
>> 1292 #endif
>> 1293
>> 1294 /* first fix the page at the start of the kernel, that
>> 1295 * contains also kernel_pg_dir.
>> 1296 */
>> 1297 movel %pc@(L(phys_kernel_start)),%d0
>> 1298 subl #PAGE_OFFSET,%d0
>> 1299 lea %pc@(_stext),%a0
>> 1300 subl %d0,%a0
>> 1301 mmu_fixup_page_mmu_cache %a0
>> 1302
>> 1303 movel %pc@(L(kernel_end)),%a0
>> 1304 subl %d0,%a0
>> 1305 movel %pc@(L(memory_start)),%a1
>> 1306 subl %d0,%a1
>> 1307 bra 2f
>> 1308 1:
>> 1309 mmu_fixup_page_mmu_cache %a0
>> 1310 addw #PAGESIZE,%a0
>> 1311 2:
>> 1312 cmpl %a0,%a1
>> 1313 jgt 1b
>> 1314
>> 1315 L(mmu_fixup_done):
>> 1316
>> 1317 #ifdef MMU_PRINT
>> 1318 mmu_print
>> 1319 #endif
>> 1320
>> 1321 /*
>> 1322 * mmu_engage
>> 1323 *
>> 1324 * This chunk of code performs the gruesome task of engaging the MMU.
>> 1325 * The reason its gruesome is because when the MMU becomes engaged it
>> 1326 * maps logical addresses to physical addresses. The Program Counter
>> 1327 * register is then passed through the MMU before the next instruction
>> 1328 * is fetched (the instruction following the engage MMU instruction).
>> 1329 * This may mean one of two things:
>> 1330 * 1. The Program Counter falls within the logical address space of
>> 1331 * the kernel of which there are two sub-possibilities:
>> 1332 * A. The PC maps to the correct instruction (logical PC == physical
>> 1333 * code location), or
>> 1334 * B. The PC does not map through and the processor will read some
>> 1335 * data (or instruction) which is not the logically next instr.
>> 1336 * As you can imagine, A is good and B is bad.
>> 1337 * Alternatively,
>> 1338 * 2. The Program Counter does not map through the MMU. The processor
>> 1339 * will take a Bus Error.
>> 1340 * Clearly, 2 is bad.
>> 1341 * It doesn't take a wiz kid to figure you want 1.A.
>> 1342 * This code creates that possibility.
>> 1343 * There are two possible 1.A. states (we now ignore the other above states):
>> 1344 * A. The kernel is located at physical memory addressed the same as
>> 1345 * the logical memory for the kernel, i.e., 0x01000.
>> 1346 * B. The kernel is located some where else. e.g., 0x0400.0000
>> 1347 *
>> 1348 * Under some conditions the Macintosh can look like A or B.
>> 1349 * [A friend and I once noted that Apple hardware engineers should be
>> 1350 * wacked twice each day: once when they show up at work (as in, Whack!,
>> 1351 * "This is for the screwy hardware we know you're going to design today."),
>> 1352 * and also at the end of the day (as in, Whack! "I don't know what
>> 1353 * you designed today, but I'm sure it wasn't good."). -- rst]
>> 1354 *
>> 1355 * This code works on the following premise:
>> 1356 * If the kernel start (%d5) is within the first 16 Meg of RAM,
>> 1357 * then create a mapping for the kernel at logical 0x8000.0000 to
>> 1358 * the physical location of the pc. And, create a transparent
>> 1359 * translation register for the first 16 Meg. Then, after the MMU
>> 1360 * is engaged, the PC can be moved up into the 0x8000.0000 range
>> 1361 * and then the transparent translation can be turned off and then
>> 1362 * the PC can jump to the correct logical location and it will be
>> 1363 * home (finally). This is essentially the code that the Amiga used
>> 1364 * to use. Now, it's generalized for all processors. Which means
>> 1365 * that a fresh (but temporary) mapping has to be created. The mapping
>> 1366 * is made in page 0 (an as of yet unused location -- except for the
>> 1367 * stack!). This temporary mapping will only require 1 pointer table
>> 1368 * and a single page table (it can map 256K).
>> 1369 *
>> 1370 * OK, alternatively, imagine that the Program Counter is not within
>> 1371 * the first 16 Meg. Then, just use Transparent Translation registers
>> 1372 * to do the right thing.
>> 1373 *
>> 1374 * Last, if _start is already at 0x01000, then there's nothing special
>> 1375 * to do (in other words, in a degenerate case of the first case above,
>> 1376 * do nothing).
>> 1377 *
>> 1378 * Let's do it.
>> 1379 *
>> 1380 *
>> 1381 */
>> 1382
>> 1383 putc 'H'
>> 1384
>> 1385 mmu_engage
>> 1386
>> 1387 /*
>> 1388 * After this point no new memory is allocated and
>> 1389 * the start of available memory is stored in availmem.
>> 1390 * (The bootmem allocator requires now the physicall address.)
>> 1391 */
>> 1392
>> 1393 movel L(memory_start),availmem
>> 1394
>> 1395 #ifdef CONFIG_AMIGA
>> 1396 is_not_amiga(1f)
>> 1397 /* fixup the Amiga custom register location before printing */
>> 1398 clrl L(custom)
>> 1399 1:
>> 1400 #endif
>> 1401
>> 1402 #ifdef CONFIG_ATARI
>> 1403 is_not_atari(1f)
>> 1404 /* fixup the Atari iobase register location before printing */
>> 1405 movel #0xff000000,L(iobase)
>> 1406 1:
>> 1407 #endif
>> 1408
>> 1409 #ifdef CONFIG_MAC
>> 1410 is_not_mac(1f)
>> 1411 movel #~VIDEOMEMMASK,%d0
>> 1412 andl L(mac_videobase),%d0
>> 1413 addl #VIDEOMEMBASE,%d0
>> 1414 movel %d0,L(mac_videobase)
>> 1415 #if defined(CONSOLE)
>> 1416 movel %pc@(L(phys_kernel_start)),%d0
>> 1417 subl #PAGE_OFFSET,%d0
>> 1418 subl %d0,L(console_font)
>> 1419 subl %d0,L(console_font_data)
>> 1420 #endif
>> 1421 #ifdef SERIAL_DEBUG
>> 1422 orl #0x50000000,L(mac_sccbase)
>> 1423 #endif
>> 1424 1:
>> 1425 #endif
>> 1426
>> 1427 #ifdef CONFIG_HP300
>> 1428 is_not_hp300(2f)
>> 1429 /*
>> 1430 * Fix up the iobase register to point to the new location of the LEDs.
>> 1431 */
>> 1432 movel #0xf0000000,L(iobase)
>> 1433
>> 1434 /*
>> 1435 * Energise the FPU and caches.
>> 1436 */
>> 1437 is_040(1f)
>> 1438 movel #0x60,0xf05f400c
>> 1439 jbra 2f
>> 1440
>> 1441 /*
>> 1442 * 040: slightly different, apparently.
>> 1443 */
>> 1444 1: movew #0,0xf05f400e
>> 1445 movew #0x64,0xf05f400e
>> 1446 2:
>> 1447 #endif
>> 1448
>> 1449 #ifdef CONFIG_SUN3X
>> 1450 is_not_sun3x(1f)
>> 1451
>> 1452 /* enable copro */
>> 1453 oriw #0x4000,0x61000000
>> 1454 1:
>> 1455 #endif
>> 1456
>> 1457 #ifdef CONFIG_APOLLO
>> 1458 is_not_apollo(1f)
>> 1459
>> 1460 /*
>> 1461 * Fix up the iobase before printing
>> 1462 */
>> 1463 movel #0x80000000,L(iobase)
>> 1464 1:
>> 1465 #endif
>> 1466
>> 1467 putc 'I'
>> 1468 leds 0x10
>> 1469
>> 1470 /*
>> 1471 * Enable caches
>> 1472 */
>> 1473
>> 1474 is_not_040_or_060(L(cache_not_680460))
>> 1475
>> 1476 L(cache680460):
>> 1477 .chip 68040
372 nop 1478 nop
373 rted r17, 0 /* enable MMU !! 1479 cpusha %bc
374 nop 1480 nop
>> 1481
>> 1482 is_060(L(cache68060))
>> 1483
>> 1484 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0
>> 1485 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1486 movec %d0,%cacr
>> 1487 jra L(cache_done)
>> 1488
>> 1489 L(cache68060):
>> 1490 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
>> 1491 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1492 movec %d0,%cacr
>> 1493 /* enable superscalar dispatch in PCR */
>> 1494 moveq #1,%d0
>> 1495 .chip 68060
>> 1496 movec %d0,%pcr
>> 1497
>> 1498 jbra L(cache_done)
>> 1499 L(cache_not_680460):
>> 1500 L(cache68030):
>> 1501 .chip 68030
>> 1502 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
>> 1503 movec %d0,%cacr
>> 1504
>> 1505 jra L(cache_done)
>> 1506 .chip 68k
>> 1507 L(cache_done):
>> 1508
>> 1509 putc 'J'
>> 1510
>> 1511 /*
>> 1512 * Setup initial stack pointer
>> 1513 */
>> 1514 lea init_task,%curptr
>> 1515 lea init_thread_union+THREAD_SIZE,%sp
>> 1516
>> 1517 putc 'K'
>> 1518
>> 1519 subl %a6,%a6 /* clear a6 for gdb */
>> 1520
>> 1521 /*
>> 1522 * The new 64bit printf support requires an early exception initialization.
>> 1523 */
>> 1524 jbsr base_trap_init
>> 1525
>> 1526 /* jump to the kernel start */
>> 1527
>> 1528 putc '\n'
>> 1529 leds 0x55
>> 1530
>> 1531 jbsr start_kernel
>> 1532
>> 1533 /*
>> 1534 * Find a tag record in the bootinfo structure
>> 1535 * The bootinfo structure is located right after the kernel bss
>> 1536 * Returns: d0: size (-1 if not found)
>> 1537 * a0: data pointer (end-of-records if not found)
>> 1538 */
>> 1539 func_start get_bi_record,%d1
>> 1540
>> 1541 movel ARG1,%d0
>> 1542 lea %pc@(_end),%a0
>> 1543 1: tstw %a0@(BIR_TAG)
>> 1544 jeq 3f
>> 1545 cmpw %a0@(BIR_TAG),%d0
>> 1546 jeq 2f
>> 1547 addw %a0@(BIR_SIZE),%a0
>> 1548 jra 1b
>> 1549 2: moveq #0,%d0
>> 1550 movew %a0@(BIR_SIZE),%d0
>> 1551 lea %a0@(BIR_DATA),%a0
>> 1552 jra 4f
>> 1553 3: moveq #-1,%d0
>> 1554 lea %a0@(BIR_SIZE),%a0
>> 1555 4:
>> 1556 func_return get_bi_record
>> 1557
>> 1558
>> 1559 /*
>> 1560 * MMU Initialization Begins Here
>> 1561 *
>> 1562 * The structure of the MMU tables on the 68k machines
>> 1563 * is thus:
>> 1564 * Root Table
>> 1565 * Logical addresses are translated through
>> 1566 * a hierarchical translation mechanism where the high-order
>> 1567 * seven bits of the logical address (LA) are used as an
>> 1568 * index into the "root table." Each entry in the root
>> 1569 * table has a bit which specifies if it's a valid pointer to a
>> 1570 * pointer table. Each entry defines a 32KMeg range of memory.
>> 1571 * If an entry is invalid then that logical range of 32M is
>> 1572 * invalid and references to that range of memory (when the MMU
>> 1573 * is enabled) will fault. If the entry is valid, then it does
>> 1574 * one of two things. On 040/060 class machines, it points to
>> 1575 * a pointer table which then describes more finely the memory
>> 1576 * within that 32M range. On 020/030 class machines, a technique
>> 1577 * called "early terminating descriptors" are used. This technique
>> 1578 * allows an entire 32Meg to be described by a single entry in the
>> 1579 * root table. Thus, this entry in the root table, contains the
>> 1580 * physical address of the memory or I/O at the logical address
>> 1581 * which the entry represents and it also contains the necessary
>> 1582 * cache bits for this region.
>> 1583 *
>> 1584 * Pointer Tables
>> 1585 * Per the Root Table, there will be one or more
>> 1586 * pointer tables. Each pointer table defines a 32M range.
>> 1587 * Not all of the 32M range need be defined. Again, the next
>> 1588 * seven bits of the logical address are used an index into
>> 1589 * the pointer table to point to page tables (if the pointer
>> 1590 * is valid). There will undoubtedly be more than one
>> 1591 * pointer table for the kernel because each pointer table
>> 1592 * defines a range of only 32M. Valid pointer table entries
>> 1593 * point to page tables, or are early terminating entries
>> 1594 * themselves.
>> 1595 *
>> 1596 * Page Tables
>> 1597 * Per the Pointer Tables, each page table entry points
>> 1598 * to the physical page in memory that supports the logical
>> 1599 * address that translates to the particular index.
>> 1600 *
>> 1601 * In short, the Logical Address gets translated as follows:
>> 1602 * bits 31..26 - index into the Root Table
>> 1603 * bits 25..18 - index into the Pointer Table
>> 1604 * bits 17..12 - index into the Page Table
>> 1605 * bits 11..0 - offset into a particular 4K page
>> 1606 *
>> 1607 * The algorithms which follows do one thing: they abstract
>> 1608 * the MMU hardware. For example, there are three kinds of
>> 1609 * cache settings that are relevant. Either, memory is
>> 1610 * being mapped in which case it is either Kernel Code (or
>> 1611 * the RamDisk) or it is MMU data. On the 030, the MMU data
>> 1612 * option also describes the kernel. Or, I/O is being mapped
>> 1613 * in which case it has its own kind of cache bits. There
>> 1614 * are constants which abstract these notions from the code that
>> 1615 * actually makes the call to map some range of memory.
>> 1616 *
>> 1617 *
>> 1618 *
>> 1619 */
>> 1620
>> 1621 #ifdef MMU_PRINT
>> 1622 /*
>> 1623 * mmu_print
>> 1624 *
>> 1625 * This algorithm will print out the current MMU mappings.
>> 1626 *
>> 1627 * Input:
>> 1628 * %a5 points to the root table. Everything else is calculated
>> 1629 * from this.
>> 1630 */
>> 1631
>> 1632 #define mmu_next_valid 0
>> 1633 #define mmu_start_logical 4
>> 1634 #define mmu_next_logical 8
>> 1635 #define mmu_start_physical 12
>> 1636 #define mmu_next_physical 16
>> 1637
>> 1638 #define MMU_PRINT_INVALID -1
>> 1639 #define MMU_PRINT_VALID 1
>> 1640 #define MMU_PRINT_UNINITED 0
>> 1641
>> 1642 #define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2:
>> 1643
>> 1644 func_start mmu_print,%a0-%a6/%d0-%d7
>> 1645
>> 1646 movel %pc@(L(kernel_pgdir_ptr)),%a5
>> 1647 lea %pc@(L(mmu_print_data)),%a0
>> 1648 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
>> 1649
>> 1650 is_not_040_or_060(mmu_030_print)
>> 1651
>> 1652 mmu_040_print:
>> 1653 puts "\nMMU040\n"
>> 1654 puts "rp:"
>> 1655 putn %a5
>> 1656 putc '\n'
>> 1657 #if 0
>> 1658 /*
>> 1659 * The following #if/#endif block is a tight algorithm for dumping the 040
>> 1660 * MMU Map in gory detail. It really isn't that practical unless the
>> 1661 * MMU Map algorithm appears to go awry and you need to debug it at the
>> 1662 * entry per entry level.
>> 1663 */
>> 1664 movel #ROOT_TABLE_SIZE,%d5
>> 1665 #if 0
>> 1666 movel %a5@+,%d7 | Burn an entry to skip the kernel mappings,
>> 1667 subql #1,%d5 | they (might) work
>> 1668 #endif
>> 1669 1: tstl %d5
>> 1670 jbeq mmu_print_done
>> 1671 subq #1,%d5
>> 1672 movel %a5@+,%d7
>> 1673 btst #1,%d7
>> 1674 jbeq 1b
>> 1675
>> 1676 2: putn %d7
>> 1677 andil #0xFFFFFE00,%d7
>> 1678 movel %d7,%a4
>> 1679 movel #PTR_TABLE_SIZE,%d4
>> 1680 putc ' '
>> 1681 3: tstl %d4
>> 1682 jbeq 11f
>> 1683 subq #1,%d4
>> 1684 movel %a4@+,%d7
>> 1685 btst #1,%d7
>> 1686 jbeq 3b
>> 1687
>> 1688 4: putn %d7
>> 1689 andil #0xFFFFFF00,%d7
>> 1690 movel %d7,%a3
>> 1691 movel #PAGE_TABLE_SIZE,%d3
>> 1692 5: movel #8,%d2
>> 1693 6: tstl %d3
>> 1694 jbeq 31f
>> 1695 subq #1,%d3
>> 1696 movel %a3@+,%d6
>> 1697 btst #0,%d6
>> 1698 jbeq 6b
>> 1699 7: tstl %d2
>> 1700 jbeq 8f
>> 1701 subq #1,%d2
>> 1702 putc ' '
>> 1703 jbra 91f
>> 1704 8: putc '\n'
>> 1705 movel #8+1+8+1+1,%d2
>> 1706 9: putc ' '
>> 1707 dbra %d2,9b
>> 1708 movel #7,%d2
>> 1709 91: putn %d6
>> 1710 jbra 6b
>> 1711
>> 1712 31: putc '\n'
>> 1713 movel #8+1,%d2
>> 1714 32: putc ' '
>> 1715 dbra %d2,32b
>> 1716 jbra 3b
>> 1717
>> 1718 11: putc '\n'
>> 1719 jbra 1b
>> 1720 #endif /* MMU 040 Dumping code that's gory and detailed */
>> 1721
>> 1722 lea %pc@(kernel_pg_dir),%a5
>> 1723 movel %a5,%a0 /* a0 has the address of the root table ptr */
>> 1724 movel #0x00000000,%a4 /* logical address */
>> 1725 moveql #0,%d0
>> 1726 40:
>> 1727 /* Increment the logical address and preserve in d5 */
>> 1728 movel %a4,%d5
>> 1729 addil #PAGESIZE<<13,%d5
>> 1730 movel %a0@+,%d6
>> 1731 btst #1,%d6
>> 1732 jbne 41f
>> 1733 jbsr mmu_print_tuple_invalidate
>> 1734 jbra 48f
>> 1735 41:
>> 1736 movel #0,%d1
>> 1737 andil #0xfffffe00,%d6
>> 1738 movel %d6,%a1
>> 1739 42:
>> 1740 movel %a4,%d5
>> 1741 addil #PAGESIZE<<6,%d5
>> 1742 movel %a1@+,%d6
>> 1743 btst #1,%d6
>> 1744 jbne 43f
>> 1745 jbsr mmu_print_tuple_invalidate
>> 1746 jbra 47f
>> 1747 43:
>> 1748 movel #0,%d2
>> 1749 andil #0xffffff00,%d6
>> 1750 movel %d6,%a2
>> 1751 44:
>> 1752 movel %a4,%d5
>> 1753 addil #PAGESIZE,%d5
>> 1754 movel %a2@+,%d6
>> 1755 btst #0,%d6
>> 1756 jbne 45f
>> 1757 jbsr mmu_print_tuple_invalidate
>> 1758 jbra 46f
>> 1759 45:
>> 1760 moveml %d0-%d1,%sp@-
>> 1761 movel %a4,%d0
>> 1762 movel %d6,%d1
>> 1763 andil #0xfffff4e0,%d1
>> 1764 lea %pc@(mmu_040_print_flags),%a6
>> 1765 jbsr mmu_print_tuple
>> 1766 moveml %sp@+,%d0-%d1
>> 1767 46:
>> 1768 movel %d5,%a4
>> 1769 addq #1,%d2
>> 1770 cmpib #64,%d2
>> 1771 jbne 44b
>> 1772 47:
>> 1773 movel %d5,%a4
>> 1774 addq #1,%d1
>> 1775 cmpib #128,%d1
>> 1776 jbne 42b
>> 1777 48:
>> 1778 movel %d5,%a4 /* move to the next logical address */
>> 1779 addq #1,%d0
>> 1780 cmpib #128,%d0
>> 1781 jbne 40b
>> 1782
>> 1783 .chip 68040
>> 1784 movec %dtt1,%d0
>> 1785 movel %d0,%d1
>> 1786 andiw #0x8000,%d1 /* is it valid ? */
>> 1787 jbeq 1f /* No, bail out */
>> 1788
>> 1789 movel %d0,%d1
>> 1790 andil #0xff000000,%d1 /* Get the address */
>> 1791 putn %d1
>> 1792 puts "=="
>> 1793 putn %d1
>> 1794
>> 1795 movel %d0,%d6
>> 1796 jbsr mmu_040_print_flags_tt
>> 1797 1:
>> 1798 movec %dtt0,%d0
>> 1799 movel %d0,%d1
>> 1800 andiw #0x8000,%d1 /* is it valid ? */
>> 1801 jbeq 1f /* No, bail out */
>> 1802
>> 1803 movel %d0,%d1
>> 1804 andil #0xff000000,%d1 /* Get the address */
>> 1805 putn %d1
>> 1806 puts "=="
>> 1807 putn %d1
>> 1808
>> 1809 movel %d0,%d6
>> 1810 jbsr mmu_040_print_flags_tt
>> 1811 1:
>> 1812 .chip 68k
>> 1813
>> 1814 jbra mmu_print_done
>> 1815
>> 1816 mmu_040_print_flags:
>> 1817 btstl #10,%d6
>> 1818 putZc(' ','G') /* global bit */
>> 1819 btstl #7,%d6
>> 1820 putZc(' ','S') /* supervisor bit */
>> 1821 mmu_040_print_flags_tt:
>> 1822 btstl #6,%d6
>> 1823 jbne 3f
>> 1824 putc 'C'
>> 1825 btstl #5,%d6
>> 1826 putZc('w','c') /* write through or copy-back */
>> 1827 jbra 4f
>> 1828 3:
>> 1829 putc 'N'
>> 1830 btstl #5,%d6
>> 1831 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */
>> 1832 4:
>> 1833 rts
>> 1834
>> 1835 mmu_030_print_flags:
>> 1836 btstl #6,%d6
>> 1837 putZc('C','I') /* write through or copy-back */
>> 1838 rts
>> 1839
>> 1840 mmu_030_print:
>> 1841 puts "\nMMU030\n"
>> 1842 puts "\nrp:"
>> 1843 putn %a5
>> 1844 putc '\n'
>> 1845 movel %a5,%d0
>> 1846 andil #0xfffffff0,%d0
>> 1847 movel %d0,%a0
>> 1848 movel #0x00000000,%a4 /* logical address */
>> 1849 movel #0,%d0
>> 1850 30:
>> 1851 movel %a4,%d5
>> 1852 addil #PAGESIZE<<13,%d5
>> 1853 movel %a0@+,%d6
>> 1854 btst #1,%d6 /* is it a table ptr? */
>> 1855 jbne 31f /* yes */
>> 1856 btst #0,%d6 /* is it early terminating? */
>> 1857 jbeq 1f /* no */
>> 1858 jbsr mmu_030_print_helper
>> 1859 jbra 38f
>> 1860 1:
>> 1861 jbsr mmu_print_tuple_invalidate
>> 1862 jbra 38f
>> 1863 31:
>> 1864 movel #0,%d1
>> 1865 andil #0xfffffff0,%d6
>> 1866 movel %d6,%a1
>> 1867 32:
>> 1868 movel %a4,%d5
>> 1869 addil #PAGESIZE<<6,%d5
>> 1870 movel %a1@+,%d6
>> 1871 btst #1,%d6 /* is it a table ptr? */
>> 1872 jbne 33f /* yes */
>> 1873 btst #0,%d6 /* is it a page descriptor? */
>> 1874 jbeq 1f /* no */
>> 1875 jbsr mmu_030_print_helper
>> 1876 jbra 37f
>> 1877 1:
>> 1878 jbsr mmu_print_tuple_invalidate
>> 1879 jbra 37f
>> 1880 33:
>> 1881 movel #0,%d2
>> 1882 andil #0xfffffff0,%d6
>> 1883 movel %d6,%a2
>> 1884 34:
>> 1885 movel %a4,%d5
>> 1886 addil #PAGESIZE,%d5
>> 1887 movel %a2@+,%d6
>> 1888 btst #0,%d6
>> 1889 jbne 35f
>> 1890 jbsr mmu_print_tuple_invalidate
>> 1891 jbra 36f
>> 1892 35:
>> 1893 jbsr mmu_030_print_helper
>> 1894 36:
>> 1895 movel %d5,%a4
>> 1896 addq #1,%d2
>> 1897 cmpib #64,%d2
>> 1898 jbne 34b
>> 1899 37:
>> 1900 movel %d5,%a4
>> 1901 addq #1,%d1
>> 1902 cmpib #128,%d1
>> 1903 jbne 32b
>> 1904 38:
>> 1905 movel %d5,%a4 /* move to the next logical address */
>> 1906 addq #1,%d0
>> 1907 cmpib #128,%d0
>> 1908 jbne 30b
>> 1909
>> 1910 mmu_print_done:
>> 1911 puts "\n"
>> 1912
>> 1913 func_return mmu_print
>> 1914
>> 1915
>> 1916 mmu_030_print_helper:
>> 1917 moveml %d0-%d1,%sp@-
>> 1918 movel %a4,%d0
>> 1919 movel %d6,%d1
>> 1920 lea %pc@(mmu_030_print_flags),%a6
>> 1921 jbsr mmu_print_tuple
>> 1922 moveml %sp@+,%d0-%d1
>> 1923 rts
>> 1924
>> 1925 mmu_print_tuple_invalidate:
>> 1926 moveml %a0/%d7,%sp@-
>> 1927
>> 1928 lea %pc@(L(mmu_print_data)),%a0
>> 1929 tstl %a0@(mmu_next_valid)
>> 1930 jbmi mmu_print_tuple_invalidate_exit
>> 1931
>> 1932 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
>> 1933
>> 1934 putn %a4
>> 1935
>> 1936 puts "##\n"
>> 1937
>> 1938 mmu_print_tuple_invalidate_exit:
>> 1939 moveml %sp@+,%a0/%d7
>> 1940 rts
>> 1941
>> 1942
>> 1943 mmu_print_tuple:
>> 1944 moveml %d0-%d7/%a0,%sp@-
>> 1945
>> 1946 lea %pc@(L(mmu_print_data)),%a0
>> 1947
>> 1948 tstl %a0@(mmu_next_valid)
>> 1949 jble mmu_print_tuple_print
>> 1950
>> 1951 cmpl %a0@(mmu_next_physical),%d1
>> 1952 jbeq mmu_print_tuple_increment
>> 1953
>> 1954 mmu_print_tuple_print:
>> 1955 putn %d0
>> 1956 puts "->"
>> 1957 putn %d1
>> 1958
>> 1959 movel %d1,%d6
>> 1960 jbsr %a6@
>> 1961
>> 1962 mmu_print_tuple_record:
>> 1963 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid)
>> 1964
>> 1965 movel %d1,%a0@(mmu_next_physical)
>> 1966
>> 1967 mmu_print_tuple_increment:
>> 1968 movel %d5,%d7
>> 1969 subl %a4,%d7
>> 1970 addl %d7,%a0@(mmu_next_physical)
>> 1971
>> 1972 mmu_print_tuple_exit:
>> 1973 moveml %sp@+,%d0-%d7/%a0
>> 1974 rts
>> 1975
>> 1976 mmu_print_machine_cpu_types:
>> 1977 puts "machine: "
>> 1978
>> 1979 is_not_amiga(1f)
>> 1980 puts "amiga"
>> 1981 jbra 9f
>> 1982 1:
>> 1983 is_not_atari(2f)
>> 1984 puts "atari"
>> 1985 jbra 9f
>> 1986 2:
>> 1987 is_not_mac(3f)
>> 1988 puts "macintosh"
>> 1989 jbra 9f
>> 1990 3: puts "unknown"
>> 1991 9: putc '\n'
>> 1992
>> 1993 puts "cputype: 0"
>> 1994 is_not_060(1f)
>> 1995 putc '6'
>> 1996 jbra 9f
>> 1997 1:
>> 1998 is_not_040_or_060(2f)
>> 1999 putc '4'
>> 2000 jbra 9f
>> 2001 2: putc '3'
>> 2002 9: putc '0'
>> 2003 putc '\n'
>> 2004
>> 2005 rts
>> 2006 #endif /* MMU_PRINT */
>> 2007
>> 2008 /*
>> 2009 * mmu_map_tt
>> 2010 *
>> 2011 * This is a specific function which works on all 680x0 machines.
>> 2012 * On 030, 040 & 060 it will attempt to use Transparent Translation
>> 2013 * registers (tt1).
>> 2014 * On 020 it will call the standard mmu_map which will use early
>> 2015 * terminating descriptors.
>> 2016 */
>> 2017 func_start mmu_map_tt,%d0/%d1/%a0,4
>> 2018
>> 2019 dputs "mmu_map_tt:"
>> 2020 dputn ARG1
>> 2021 dputn ARG2
>> 2022 dputn ARG3
>> 2023 dputn ARG4
>> 2024 dputc '\n'
>> 2025
>> 2026 is_020(L(do_map))
>> 2027
>> 2028 /* Extract the highest bit set
>> 2029 */
>> 2030 bfffo ARG3{#0,#32},%d1
>> 2031 cmpw #8,%d1
>> 2032 jcc L(do_map)
>> 2033
>> 2034 /* And get the mask
>> 2035 */
>> 2036 moveq #-1,%d0
>> 2037 lsrl %d1,%d0
>> 2038 lsrl #1,%d0
>> 2039
>> 2040 /* Mask the address
>> 2041 */
>> 2042 movel %d0,%d1
>> 2043 notl %d1
>> 2044 andl ARG2,%d1
>> 2045
>> 2046 /* Generate the upper 16bit of the tt register
>> 2047 */
>> 2048 lsrl #8,%d0
>> 2049 orl %d0,%d1
>> 2050 clrw %d1
>> 2051
>> 2052 is_040_or_060(L(mmu_map_tt_040))
>> 2053
>> 2054 /* set 030 specific bits (read/write access for supervisor mode
>> 2055 * (highest function code set, lower two bits masked))
>> 2056 */
>> 2057 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
>> 2058 movel ARG4,%d0
>> 2059 btst #6,%d0
>> 2060 jeq 1f
>> 2061 orw #TTR_CI,%d1
>> 2062
>> 2063 1: lea STACK,%a0
>> 2064 dputn %d1
>> 2065 movel %d1,%a0@
>> 2066 .chip 68030
>> 2067 tstl ARG1
>> 2068 jne 1f
>> 2069 pmove %a0@,%tt0
>> 2070 jra 2f
>> 2071 1: pmove %a0@,%tt1
>> 2072 2: .chip 68k
>> 2073 jra L(mmu_map_tt_done)
>> 2074
>> 2075 /* set 040 specific bits
>> 2076 */
>> 2077 L(mmu_map_tt_040):
>> 2078 orw #TTR_ENABLE+TTR_KERNELMODE,%d1
>> 2079 orl ARG4,%d1
>> 2080 dputn %d1
>> 2081
>> 2082 .chip 68040
>> 2083 tstl ARG1
>> 2084 jne 1f
>> 2085 movec %d1,%itt0
>> 2086 movec %d1,%dtt0
>> 2087 jra 2f
>> 2088 1: movec %d1,%itt1
>> 2089 movec %d1,%dtt1
>> 2090 2: .chip 68k
>> 2091
>> 2092 jra L(mmu_map_tt_done)
>> 2093
>> 2094 L(do_map):
>> 2095 mmu_map_eq ARG2,ARG3,ARG4
>> 2096
>> 2097 L(mmu_map_tt_done):
>> 2098
>> 2099 func_return mmu_map_tt
>> 2100
>> 2101 /*
>> 2102 * mmu_map
>> 2103 *
>> 2104 * This routine will map a range of memory using a pointer
>> 2105 * table and allocating the pages on the fly from the kernel.
>> 2106 * The pointer table does not have to be already linked into
>> 2107 * the root table, this routine will do that if necessary.
>> 2108 *
>> 2109 * NOTE
>> 2110 * This routine will assert failure and use the serial_putc
>> 2111 * routines in the case of a run-time error. For example,
>> 2112 * if the address is already mapped.
>> 2113 *
>> 2114 * NOTE-2
>> 2115 * This routine will use early terminating descriptors
>> 2116 * where possible for the 68020+68851 and 68030 type
>> 2117 * processors.
>> 2118 */
>> 2119 func_start mmu_map,%d0-%d4/%a0-%a4
>> 2120
>> 2121 dputs "\nmmu_map:"
>> 2122 dputn ARG1
>> 2123 dputn ARG2
>> 2124 dputn ARG3
>> 2125 dputn ARG4
>> 2126 dputc '\n'
>> 2127
>> 2128 /* Get logical address and round it down to 256KB
>> 2129 */
>> 2130 movel ARG1,%d0
>> 2131 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2132 movel %d0,%a3
>> 2133
>> 2134 /* Get the end address
>> 2135 */
>> 2136 movel ARG1,%a4
>> 2137 addl ARG3,%a4
>> 2138 subql #1,%a4
>> 2139
>> 2140 /* Get physical address and round it down to 256KB
>> 2141 */
>> 2142 movel ARG2,%d0
>> 2143 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2144 movel %d0,%a2
>> 2145
>> 2146 /* Add page attributes to the physical address
>> 2147 */
>> 2148 movel ARG4,%d0
>> 2149 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2150 addw %d0,%a2
>> 2151
>> 2152 dputn %a2
>> 2153 dputn %a3
>> 2154 dputn %a4
>> 2155
>> 2156 is_not_040_or_060(L(mmu_map_030))
>> 2157
>> 2158 addw #_PAGE_GLOBAL040,%a2
>> 2159 /*
>> 2160 * MMU 040 & 060 Support
>> 2161 *
>> 2162 * The MMU usage for the 040 and 060 is different enough from
>> 2163 * the 030 and 68851 that there is separate code. This comment
>> 2164 * block describes the data structures and algorithms built by
>> 2165 * this code.
>> 2166 *
>> 2167 * The 040 does not support early terminating descriptors, as
>> 2168 * the 030 does. Therefore, a third level of table is needed
>> 2169 * for the 040, and that would be the page table. In Linux,
>> 2170 * page tables are allocated directly from the memory above the
>> 2171 * kernel.
>> 2172 *
>> 2173 */
>> 2174
>> 2175 L(mmu_map_040):
>> 2176 /* Calculate the offset into the root table
>> 2177 */
>> 2178 movel %a3,%d0
>> 2179 moveq #ROOT_INDEX_SHIFT,%d1
>> 2180 lsrl %d1,%d0
>> 2181 mmu_get_root_table_entry %d0
>> 2182
>> 2183 /* Calculate the offset into the pointer table
>> 2184 */
>> 2185 movel %a3,%d0
>> 2186 moveq #PTR_INDEX_SHIFT,%d1
>> 2187 lsrl %d1,%d0
>> 2188 andl #PTR_TABLE_SIZE-1,%d0
>> 2189 mmu_get_ptr_table_entry %a0,%d0
>> 2190
>> 2191 /* Calculate the offset into the page table
>> 2192 */
>> 2193 movel %a3,%d0
>> 2194 moveq #PAGE_INDEX_SHIFT,%d1
>> 2195 lsrl %d1,%d0
>> 2196 andl #PAGE_TABLE_SIZE-1,%d0
>> 2197 mmu_get_page_table_entry %a0,%d0
>> 2198
>> 2199 /* The page table entry must not no be busy
>> 2200 */
>> 2201 tstl %a0@
>> 2202 jne L(mmu_map_error)
>> 2203
>> 2204 /* Do the mapping and advance the pointers
>> 2205 */
>> 2206 movel %a2,%a0@
>> 2207 2:
>> 2208 addw #PAGESIZE,%a2
>> 2209 addw #PAGESIZE,%a3
>> 2210
>> 2211 /* Ready with mapping?
>> 2212 */
>> 2213 lea %a3@(-1),%a0
>> 2214 cmpl %a0,%a4
>> 2215 jhi L(mmu_map_040)
>> 2216 jra L(mmu_map_done)
>> 2217
>> 2218 L(mmu_map_030):
>> 2219 /* Calculate the offset into the root table
>> 2220 */
>> 2221 movel %a3,%d0
>> 2222 moveq #ROOT_INDEX_SHIFT,%d1
>> 2223 lsrl %d1,%d0
>> 2224 mmu_get_root_table_entry %d0
>> 2225
>> 2226 /* Check if logical address 32MB aligned,
>> 2227 * so we can try to map it once
>> 2228 */
>> 2229 movel %a3,%d0
>> 2230 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
>> 2231 jne 1f
>> 2232
>> 2233 /* Is there enough to map for 32MB at once
>> 2234 */
>> 2235 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
>> 2236 cmpl %a1,%a4
>> 2237 jcs 1f
>> 2238
>> 2239 addql #1,%a1
>> 2240
>> 2241 /* The root table entry must not no be busy
>> 2242 */
>> 2243 tstl %a0@
>> 2244 jne L(mmu_map_error)
>> 2245
>> 2246 /* Do the mapping and advance the pointers
>> 2247 */
>> 2248 dputs "early term1"
>> 2249 dputn %a2
>> 2250 dputn %a3
>> 2251 dputn %a1
>> 2252 dputc '\n'
>> 2253 movel %a2,%a0@
>> 2254
>> 2255 movel %a1,%a3
>> 2256 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
>> 2257 jra L(mmu_mapnext_030)
>> 2258 1:
>> 2259 /* Calculate the offset into the pointer table
>> 2260 */
>> 2261 movel %a3,%d0
>> 2262 moveq #PTR_INDEX_SHIFT,%d1
>> 2263 lsrl %d1,%d0
>> 2264 andl #PTR_TABLE_SIZE-1,%d0
>> 2265 mmu_get_ptr_table_entry %a0,%d0
>> 2266
>> 2267 /* The pointer table entry must not no be busy
>> 2268 */
>> 2269 tstl %a0@
>> 2270 jne L(mmu_map_error)
>> 2271
>> 2272 /* Do the mapping and advance the pointers
>> 2273 */
>> 2274 dputs "early term2"
>> 2275 dputn %a2
>> 2276 dputn %a3
>> 2277 dputc '\n'
>> 2278 movel %a2,%a0@
>> 2279
>> 2280 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2
>> 2281 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3
>> 2282
>> 2283 L(mmu_mapnext_030):
>> 2284 /* Ready with mapping?
>> 2285 */
>> 2286 lea %a3@(-1),%a0
>> 2287 cmpl %a0,%a4
>> 2288 jhi L(mmu_map_030)
>> 2289 jra L(mmu_map_done)
>> 2290
>> 2291 L(mmu_map_error):
>> 2292
>> 2293 dputs "mmu_map error:"
>> 2294 dputn %a2
>> 2295 dputn %a3
>> 2296 dputc '\n'
>> 2297
>> 2298 L(mmu_map_done):
>> 2299
>> 2300 func_return mmu_map
>> 2301
>> 2302 /*
>> 2303 * mmu_fixup
>> 2304 *
>> 2305 * On the 040 class machines, all pages that are used for the
>> 2306 * mmu have to be fixed up.
>> 2307 */
>> 2308
>> 2309 func_start mmu_fixup_page_mmu_cache,%d0/%a0
>> 2310
>> 2311 dputs "mmu_fixup_page_mmu_cache"
>> 2312 dputn ARG1
>> 2313
>> 2314 /* Calculate the offset into the root table
>> 2315 */
>> 2316 movel ARG1,%d0
>> 2317 moveq #ROOT_INDEX_SHIFT,%d1
>> 2318 lsrl %d1,%d0
>> 2319 mmu_get_root_table_entry %d0
>> 2320
>> 2321 /* Calculate the offset into the pointer table
>> 2322 */
>> 2323 movel ARG1,%d0
>> 2324 moveq #PTR_INDEX_SHIFT,%d1
>> 2325 lsrl %d1,%d0
>> 2326 andl #PTR_TABLE_SIZE-1,%d0
>> 2327 mmu_get_ptr_table_entry %a0,%d0
>> 2328
>> 2329 /* Calculate the offset into the page table
>> 2330 */
>> 2331 movel ARG1,%d0
>> 2332 moveq #PAGE_INDEX_SHIFT,%d1
>> 2333 lsrl %d1,%d0
>> 2334 andl #PAGE_TABLE_SIZE-1,%d0
>> 2335 mmu_get_page_table_entry %a0,%d0
>> 2336
>> 2337 movel %a0@,%d0
>> 2338 andil #_CACHEMASK040,%d0
>> 2339 orl %pc@(m68k_pgtable_cachemode),%d0
>> 2340 movel %d0,%a0@
>> 2341
>> 2342 dputc '\n'
>> 2343
>> 2344 func_return mmu_fixup_page_mmu_cache
>> 2345
>> 2346 /*
>> 2347 * mmu_temp_map
>> 2348 *
>> 2349 * create a temporary mapping to enable the mmu,
>> 2350 * this we don't need any transparation translation tricks.
>> 2351 */
>> 2352
>> 2353 func_start mmu_temp_map,%d0/%d1/%a0/%a1
>> 2354
>> 2355 dputs "mmu_temp_map"
>> 2356 dputn ARG1
>> 2357 dputn ARG2
>> 2358 dputc '\n'
>> 2359
>> 2360 lea %pc@(L(temp_mmap_mem)),%a1
>> 2361
>> 2362 /* Calculate the offset in the root table
>> 2363 */
>> 2364 movel ARG2,%d0
>> 2365 moveq #ROOT_INDEX_SHIFT,%d1
>> 2366 lsrl %d1,%d0
>> 2367 mmu_get_root_table_entry %d0
>> 2368
>> 2369 /* Check if the table is temporary allocated, so we have to reuse it
>> 2370 */
>> 2371 movel %a0@,%d0
>> 2372 cmpl %pc@(L(memory_start)),%d0
>> 2373 jcc 1f
>> 2374
>> 2375 /* Temporary allocate a ptr table and insert it into the root table
>> 2376 */
>> 2377 movel %a1@,%d0
>> 2378 addl #PTR_TABLE_SIZE*4,%a1@
>> 2379 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2380 movel %d0,%a0@
>> 2381 dputs " (new)"
>> 2382 1:
>> 2383 dputn %d0
>> 2384 /* Mask the root table entry for the ptr table
>> 2385 */
>> 2386 andw #-ROOT_TABLE_SIZE,%d0
>> 2387 movel %d0,%a0
>> 2388
>> 2389 /* Calculate the offset into the pointer table
>> 2390 */
>> 2391 movel ARG2,%d0
>> 2392 moveq #PTR_INDEX_SHIFT,%d1
>> 2393 lsrl %d1,%d0
>> 2394 andl #PTR_TABLE_SIZE-1,%d0
>> 2395 lea %a0@(%d0*4),%a0
>> 2396 dputn %a0
>> 2397
>> 2398 /* Check if a temporary page table is already allocated
>> 2399 */
>> 2400 movel %a0@,%d0
>> 2401 jne 1f
>> 2402
>> 2403 /* Temporary allocate a page table and insert it into the ptr table
>> 2404 */
>> 2405 movel %a1@,%d0
>> 2406 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
>> 2407 alignment restriction for pointer tables on the '0[46]0. */
>> 2408 addl #512,%a1@
>> 2409 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2410 movel %d0,%a0@
>> 2411 dputs " (new)"
>> 2412 1:
>> 2413 dputn %d0
>> 2414 /* Mask the ptr table entry for the page table
>> 2415 */
>> 2416 andw #-PTR_TABLE_SIZE,%d0
>> 2417 movel %d0,%a0
>> 2418
>> 2419 /* Calculate the offset into the page table
>> 2420 */
>> 2421 movel ARG2,%d0
>> 2422 moveq #PAGE_INDEX_SHIFT,%d1
>> 2423 lsrl %d1,%d0
>> 2424 andl #PAGE_TABLE_SIZE-1,%d0
>> 2425 lea %a0@(%d0*4),%a0
>> 2426 dputn %a0
>> 2427
>> 2428 /* Insert the address into the page table
>> 2429 */
>> 2430 movel ARG1,%d0
>> 2431 andw #-PAGESIZE,%d0
>> 2432 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2433 movel %d0,%a0@
>> 2434 dputn %d0
>> 2435
>> 2436 dputc '\n'
>> 2437
>> 2438 func_return mmu_temp_map
>> 2439
>> 2440 func_start mmu_engage,%d0-%d2/%a0-%a3
>> 2441
>> 2442 moveq #ROOT_TABLE_SIZE-1,%d0
>> 2443 /* Temporarily use a different root table. */
>> 2444 lea %pc@(L(kernel_pgdir_ptr)),%a0
>> 2445 movel %a0@,%a2
>> 2446 movel %pc@(L(memory_start)),%a1
>> 2447 movel %a1,%a0@
>> 2448 movel %a2,%a0
>> 2449 1:
>> 2450 movel %a0@+,%a1@+
>> 2451 dbra %d0,1b
>> 2452
>> 2453 lea %pc@(L(temp_mmap_mem)),%a0
>> 2454 movel %a1,%a0@
>> 2455
>> 2456 movew #PAGESIZE-1,%d0
>> 2457 1:
>> 2458 clrl %a1@+
>> 2459 dbra %d0,1b
>> 2460
>> 2461 lea %pc@(1b),%a0
>> 2462 movel #1b,%a1
>> 2463 /* Skip temp mappings if phys == virt */
>> 2464 cmpl %a0,%a1
>> 2465 jeq 1f
>> 2466
>> 2467 mmu_temp_map %a0,%a0
>> 2468 mmu_temp_map %a0,%a1
>> 2469
>> 2470 addw #PAGESIZE,%a0
>> 2471 addw #PAGESIZE,%a1
>> 2472 mmu_temp_map %a0,%a0
>> 2473 mmu_temp_map %a0,%a1
>> 2474 1:
>> 2475 movel %pc@(L(memory_start)),%a3
>> 2476 movel %pc@(L(phys_kernel_start)),%d2
>> 2477
>> 2478 is_not_040_or_060(L(mmu_engage_030))
>> 2479
>> 2480 L(mmu_engage_040):
>> 2481 .chip 68040
>> 2482 nop
>> 2483 cinva %bc
>> 2484 nop
>> 2485 pflusha
>> 2486 nop
>> 2487 movec %a3,%srp
>> 2488 movel #TC_ENABLE+TC_PAGE4K,%d0
>> 2489 movec %d0,%tc /* enable the MMU */
>> 2490 jmp 1f:l
>> 2491 1: nop
>> 2492 movec %a2,%srp
>> 2493 nop
>> 2494 cinva %bc
>> 2495 nop
>> 2496 pflusha
>> 2497 .chip 68k
>> 2498 jra L(mmu_engage_cleanup)
>> 2499
>> 2500 L(mmu_engage_030_temp):
>> 2501 .space 12
>> 2502 L(mmu_engage_030):
>> 2503 .chip 68030
>> 2504 lea %pc@(L(mmu_engage_030_temp)),%a0
>> 2505 movel #0x80000002,%a0@
>> 2506 movel %a3,%a0@(4)
>> 2507 movel #0x0808,%d0
>> 2508 movec %d0,%cacr
>> 2509 pmove %a0@,%srp
>> 2510 pflusha
>> 2511 /*
>> 2512 * enable,super root enable,4096 byte pages,7 bit root index,
>> 2513 * 7 bit pointer index, 6 bit page table index.
>> 2514 */
>> 2515 movel #0x82c07760,%a0@(8)
>> 2516 pmove %a0@(8),%tc /* enable the MMU */
>> 2517 jmp 1f:l
>> 2518 1: movel %a2,%a0@(4)
>> 2519 movel #0x0808,%d0
>> 2520 movec %d0,%cacr
>> 2521 pmove %a0@,%srp
>> 2522 pflusha
>> 2523 .chip 68k
>> 2524
>> 2525 L(mmu_engage_cleanup):
>> 2526 subl #PAGE_OFFSET,%d2
>> 2527 subl %d2,%a2
>> 2528 movel %a2,L(kernel_pgdir_ptr)
>> 2529 subl %d2,%fp
>> 2530 subl %d2,%sp
>> 2531 subl %d2,ARG0
>> 2532
>> 2533 func_return mmu_engage
>> 2534
>> 2535 func_start mmu_get_root_table_entry,%d0/%a1
>> 2536
>> 2537 #if 0
>> 2538 dputs "mmu_get_root_table_entry:"
>> 2539 dputn ARG1
>> 2540 dputs " ="
>> 2541 #endif
>> 2542
>> 2543 movel %pc@(L(kernel_pgdir_ptr)),%a0
>> 2544 tstl %a0
>> 2545 jne 2f
>> 2546
>> 2547 dputs "\nmmu_init:"
>> 2548
>> 2549 /* Find the start of free memory, get_bi_record does this for us,
>> 2550 * as the bootinfo structure is located directly behind the kernel
>> 2551 * and and we simply search for the last entry.
>> 2552 */
>> 2553 get_bi_record BI_LAST
>> 2554 addw #PAGESIZE-1,%a0
>> 2555 movel %a0,%d0
>> 2556 andw #-PAGESIZE,%d0
>> 2557
>> 2558 dputn %d0
>> 2559
>> 2560 lea %pc@(L(memory_start)),%a0
>> 2561 movel %d0,%a0@
>> 2562 lea %pc@(L(kernel_end)),%a0
>> 2563 movel %d0,%a0@
>> 2564
>> 2565 /* we have to return the first page at _stext since the init code
>> 2566 * in mm/init.c simply expects kernel_pg_dir there, the rest of
>> 2567 * page is used for further ptr tables in get_ptr_table.
>> 2568 */
>> 2569 lea %pc@(_stext),%a0
>> 2570 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2571 movel %a0,%a1@
>> 2572 addl #ROOT_TABLE_SIZE*4,%a1@
>> 2573
>> 2574 lea %pc@(L(mmu_num_pointer_tables)),%a1
>> 2575 addql #1,%a1@
>> 2576
>> 2577 /* clear the page
>> 2578 */
>> 2579 movel %a0,%a1
>> 2580 movew #PAGESIZE/4-1,%d0
>> 2581 1:
>> 2582 clrl %a1@+
>> 2583 dbra %d0,1b
>> 2584
>> 2585 lea %pc@(L(kernel_pgdir_ptr)),%a1
>> 2586 movel %a0,%a1@
>> 2587
>> 2588 dputn %a0
>> 2589 dputc '\n'
>> 2590 2:
>> 2591 movel ARG1,%d0
>> 2592 lea %a0@(%d0*4),%a0
>> 2593
>> 2594 #if 0
>> 2595 dputn %a0
>> 2596 dputc '\n'
>> 2597 #endif
>> 2598
>> 2599 func_return mmu_get_root_table_entry
>> 2600
>> 2601
>> 2602
>> 2603 func_start mmu_get_ptr_table_entry,%d0/%a1
>> 2604
>> 2605 #if 0
>> 2606 dputs "mmu_get_ptr_table_entry:"
>> 2607 dputn ARG1
>> 2608 dputn ARG2
>> 2609 dputs " ="
>> 2610 #endif
>> 2611
>> 2612 movel ARG1,%a0
>> 2613 movel %a0@,%d0
>> 2614 jne 2f
>> 2615
>> 2616 /* Keep track of the number of pointer tables we use
>> 2617 */
>> 2618 dputs "\nmmu_get_new_ptr_table:"
>> 2619 lea %pc@(L(mmu_num_pointer_tables)),%a0
>> 2620 movel %a0@,%d0
>> 2621 addql #1,%a0@
>> 2622
>> 2623 /* See if there is a free pointer table in our cache of pointer tables
>> 2624 */
>> 2625 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2626 andw #7,%d0
>> 2627 jne 1f
>> 2628
>> 2629 /* Get a new pointer table page from above the kernel memory
>> 2630 */
>> 2631 get_new_page
>> 2632 movel %a0,%a1@
>> 2633 1:
>> 2634 /* There is an unused pointer table in our cache... use it
>> 2635 */
>> 2636 movel %a1@,%d0
>> 2637 addl #PTR_TABLE_SIZE*4,%a1@
>> 2638
>> 2639 dputn %d0
>> 2640 dputc '\n'
>> 2641
>> 2642 /* Insert the new pointer table into the root table
>> 2643 */
>> 2644 movel ARG1,%a0
>> 2645 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2646 movel %d0,%a0@
>> 2647 2:
>> 2648 /* Extract the pointer table entry
>> 2649 */
>> 2650 andw #-PTR_TABLE_SIZE,%d0
>> 2651 movel %d0,%a0
>> 2652 movel ARG2,%d0
>> 2653 lea %a0@(%d0*4),%a0
>> 2654
>> 2655 #if 0
>> 2656 dputn %a0
>> 2657 dputc '\n'
>> 2658 #endif
>> 2659
>> 2660 func_return mmu_get_ptr_table_entry
>> 2661
>> 2662
>> 2663 func_start mmu_get_page_table_entry,%d0/%a1
>> 2664
>> 2665 #if 0
>> 2666 dputs "mmu_get_page_table_entry:"
>> 2667 dputn ARG1
>> 2668 dputn ARG2
>> 2669 dputs " ="
>> 2670 #endif
>> 2671
>> 2672 movel ARG1,%a0
>> 2673 movel %a0@,%d0
>> 2674 jne 2f
>> 2675
>> 2676 /* If the page table entry doesn't exist, we allocate a complete new
>> 2677 * page and use it as one continues big page table which can cover
>> 2678 * 4MB of memory, nearly almost all mappings have that alignment.
>> 2679 */
>> 2680 get_new_page
>> 2681 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0
>> 2682
>> 2683 /* align pointer table entry for a page of page tables
>> 2684 */
>> 2685 movel ARG1,%d0
>> 2686 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
>> 2687 movel %d0,%a1
>> 2688
>> 2689 /* Insert the page tables into the pointer entries
>> 2690 */
>> 2691 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
>> 2692 1:
>> 2693 movel %a0,%a1@+
>> 2694 lea %a0@(PAGE_TABLE_SIZE*4),%a0
>> 2695 dbra %d0,1b
>> 2696
>> 2697 /* Now we can get the initialized pointer table entry
>> 2698 */
>> 2699 movel ARG1,%a0
>> 2700 movel %a0@,%d0
>> 2701 2:
>> 2702 /* Extract the page table entry
>> 2703 */
>> 2704 andw #-PAGE_TABLE_SIZE,%d0
>> 2705 movel %d0,%a0
>> 2706 movel ARG2,%d0
>> 2707 lea %a0@(%d0*4),%a0
>> 2708
>> 2709 #if 0
>> 2710 dputn %a0
>> 2711 dputc '\n'
>> 2712 #endif
>> 2713
>> 2714 func_return mmu_get_page_table_entry
>> 2715
>> 2716 /*
>> 2717 * get_new_page
>> 2718 *
>> 2719 * Return a new page from the memory start and clear it.
>> 2720 */
>> 2721 func_start get_new_page,%d0/%a1
>> 2722
>> 2723 dputs "\nget_new_page:"
>> 2724
>> 2725 /* allocate the page and adjust memory_start
>> 2726 */
>> 2727 lea %pc@(L(memory_start)),%a0
>> 2728 movel %a0@,%a1
>> 2729 addl #PAGESIZE,%a0@
>> 2730
>> 2731 /* clear the new page
>> 2732 */
>> 2733 movel %a1,%a0
>> 2734 movew #PAGESIZE/4-1,%d0
>> 2735 1:
>> 2736 clrl %a1@+
>> 2737 dbra %d0,1b
>> 2738
>> 2739 dputn %a0
>> 2740 dputc '\n'
>> 2741
>> 2742 func_return get_new_page
>> 2743
>> 2744
>> 2745
>> 2746 /*
>> 2747 * Debug output support
>> 2748 * Atarians have a choice between the parallel port, the serial port
>> 2749 * from the MFP or a serial port of the SCC
>> 2750 */
>> 2751
>> 2752 #ifdef CONFIG_MAC
>> 2753
>> 2754 L(scc_initable_mac):
>> 2755 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2756 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2757 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2758 .byte 10,0 /* NRZ */
>> 2759 .byte 11,0x50 /* use baud rate generator */
>> 2760 .byte 12,1,13,0 /* 38400 baud */
>> 2761 .byte 14,1 /* Baud rate generator enable */
>> 2762 .byte 3,0xc1 /* enable receiver */
>> 2763 .byte 5,0xea /* enable transmitter */
>> 2764 .byte -1
>> 2765 .even
>> 2766 #endif
>> 2767
>> 2768 #ifdef CONFIG_ATARI
>> 2769 /* #define USE_PRINTER */
>> 2770 /* #define USE_SCC_B */
>> 2771 /* #define USE_SCC_A */
>> 2772 #define USE_MFP
>> 2773
>> 2774 #if defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2775 #define USE_SCC
>> 2776 /* Initialisation table for SCC */
>> 2777 L(scc_initable):
>> 2778 .byte 9,12 /* Reset */
>> 2779 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2780 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2781 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2782 .byte 9,0 /* no interrupts */
>> 2783 .byte 10,0 /* NRZ */
>> 2784 .byte 11,0x50 /* use baud rate generator */
>> 2785 .byte 12,24,13,0 /* 9600 baud */
>> 2786 .byte 14,2,14,3 /* use master clock for BRG, enable */
>> 2787 .byte 3,0xc1 /* enable receiver */
>> 2788 .byte 5,0xea /* enable transmitter */
>> 2789 .byte -1
>> 2790 .even
>> 2791 #endif
>> 2792
>> 2793 #ifdef USE_PRINTER
>> 2794
>> 2795 LPSG_SELECT = 0xff8800
>> 2796 LPSG_READ = 0xff8800
>> 2797 LPSG_WRITE = 0xff8802
>> 2798 LPSG_IO_A = 14
>> 2799 LPSG_IO_B = 15
>> 2800 LPSG_CONTROL = 7
>> 2801 LSTMFP_GPIP = 0xfffa01
>> 2802 LSTMFP_DDR = 0xfffa05
>> 2803 LSTMFP_IERB = 0xfffa09
>> 2804
>> 2805 #elif defined(USE_SCC_B)
>> 2806
>> 2807 LSCC_CTRL = 0xff8c85
>> 2808 LSCC_DATA = 0xff8c87
>> 2809
>> 2810 #elif defined(USE_SCC_A)
>> 2811
>> 2812 LSCC_CTRL = 0xff8c81
>> 2813 LSCC_DATA = 0xff8c83
>> 2814
>> 2815 #elif defined(USE_MFP)
>> 2816
>> 2817 LMFP_UCR = 0xfffa29
>> 2818 LMFP_TDCDR = 0xfffa1d
>> 2819 LMFP_TDDR = 0xfffa25
>> 2820 LMFP_TSR = 0xfffa2d
>> 2821 LMFP_UDR = 0xfffa2f
>> 2822
>> 2823 #endif
>> 2824 #endif /* CONFIG_ATARI */
>> 2825
>> 2826 /*
>> 2827 * Serial port output support.
>> 2828 */
>> 2829
>> 2830 /*
>> 2831 * Initialize serial port hardware for 9600/8/1
>> 2832 */
>> 2833 func_start serial_init,%d0/%d1/%a0/%a1
>> 2834 /*
>> 2835 * Some of the register usage that follows
>> 2836 * CONFIG_AMIGA
>> 2837 * a0 = pointer to boot info record
>> 2838 * d0 = boot info offset
>> 2839 * CONFIG_ATARI
>> 2840 * a0 = address of SCC
>> 2841 * a1 = Liobase address/address of scc_initable
>> 2842 * d0 = init data for serial port
>> 2843 * CONFIG_MAC
>> 2844 * a0 = address of SCC
>> 2845 * a1 = address of scc_initable_mac
>> 2846 * d0 = init data for serial port
>> 2847 */
>> 2848
>> 2849 #ifdef CONFIG_AMIGA
>> 2850 #define SERIAL_DTR 7
>> 2851 #define SERIAL_CNTRL CIABBASE+C_PRA
>> 2852
>> 2853 is_not_amiga(1f)
>> 2854 lea %pc@(L(custom)),%a0
>> 2855 movel #-ZTWOBASE,%a0@
>> 2856 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
>> 2857 get_bi_record BI_AMIGA_SERPER
>> 2858 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2859 | movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2860 1:
>> 2861 #endif
>> 2862 #ifdef CONFIG_ATARI
>> 2863 is_not_atari(4f)
>> 2864 movel %pc@(L(iobase)),%a1
>> 2865 #if defined(USE_PRINTER)
>> 2866 bclr #0,%a1@(LSTMFP_IERB)
>> 2867 bclr #0,%a1@(LSTMFP_DDR)
>> 2868 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT)
>> 2869 moveb #0xff,%a1@(LPSG_WRITE)
>> 2870 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 2871 clrb %a1@(LPSG_WRITE)
>> 2872 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 2873 moveb %a1@(LPSG_READ),%d0
>> 2874 bset #5,%d0
>> 2875 moveb %d0,%a1@(LPSG_WRITE)
>> 2876 #elif defined(USE_SCC)
>> 2877 lea %a1@(LSCC_CTRL),%a0
>> 2878 lea %pc@(L(scc_initable)),%a1
>> 2879 2: moveb %a1@+,%d0
>> 2880 jmi 3f
>> 2881 moveb %d0,%a0@
>> 2882 moveb %a1@+,%a0@
>> 2883 jra 2b
>> 2884 3: clrb %a0@
>> 2885 #elif defined(USE_MFP)
>> 2886 bclr #1,%a1@(LMFP_TSR)
>> 2887 moveb #0x88,%a1@(LMFP_UCR)
>> 2888 andb #0x70,%a1@(LMFP_TDCDR)
>> 2889 moveb #2,%a1@(LMFP_TDDR)
>> 2890 orb #1,%a1@(LMFP_TDCDR)
>> 2891 bset #1,%a1@(LMFP_TSR)
>> 2892 #endif
>> 2893 jra L(serial_init_done)
>> 2894 4:
>> 2895 #endif
>> 2896 #ifdef CONFIG_MAC
>> 2897 is_not_mac(L(serial_init_not_mac))
>> 2898
>> 2899 #ifdef SERIAL_DEBUG
>> 2900
>> 2901 /* You may define either or both of these. */
>> 2902 #define MAC_USE_SCC_A /* Modem port */
>> 2903 #define MAC_USE_SCC_B /* Printer port */
>> 2904
>> 2905 #define mac_scc_cha_b_ctrl_offset 0x0
>> 2906 #define mac_scc_cha_a_ctrl_offset 0x2
>> 2907 #define mac_scc_cha_b_data_offset 0x4
>> 2908 #define mac_scc_cha_a_data_offset 0x6
>> 2909
>> 2910 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 2911 movel %pc@(L(mac_sccbase)),%a0
>> 2912 /* Reset SCC device */
>> 2913 moveb #9,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2914 moveb #0xc0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2915 /* Wait for 5 PCLK cycles, which is about 68 CPU cycles */
>> 2916 /* 5 / 3.6864 MHz = approx. 1.36 us = 68 / 50 MHz */
>> 2917 movel #35,%d0
>> 2918 5:
>> 2919 subq #1,%d0
>> 2920 jne 5b
>> 2921 #endif
>> 2922
>> 2923 #ifdef MAC_USE_SCC_A
>> 2924 /* Initialize channel A */
>> 2925 lea %pc@(L(scc_initable_mac)),%a1
>> 2926 5: moveb %a1@+,%d0
>> 2927 jmi 6f
>> 2928 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2929 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2930 jra 5b
>> 2931 6:
>> 2932 #endif /* MAC_USE_SCC_A */
>> 2933
>> 2934 #ifdef MAC_USE_SCC_B
>> 2935 /* Initialize channel B */
>> 2936 lea %pc@(L(scc_initable_mac)),%a1
>> 2937 7: moveb %a1@+,%d0
>> 2938 jmi 8f
>> 2939 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2940 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2941 jra 7b
>> 2942 8:
>> 2943 #endif /* MAC_USE_SCC_B */
>> 2944
>> 2945 #endif /* SERIAL_DEBUG */
>> 2946
>> 2947 jra L(serial_init_done)
>> 2948 L(serial_init_not_mac):
>> 2949 #endif /* CONFIG_MAC */
>> 2950
>> 2951 #ifdef CONFIG_Q40
>> 2952 is_not_q40(2f)
>> 2953 /* debug output goes into SRAM, so we don't do it unless requested
>> 2954 - check for '%LX$' signature in SRAM */
>> 2955 lea %pc@(q40_mem_cptr),%a1
>> 2956 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */
>> 2957 move.l #0xff020000,%a1
>> 2958 cmp.b #'%',%a1@
>> 2959 bne 2f /*nodbg*/
>> 2960 addq.w #4,%a1
>> 2961 cmp.b #'L',%a1@
>> 2962 bne 2f /*nodbg*/
>> 2963 addq.w #4,%a1
>> 2964 cmp.b #'X',%a1@
>> 2965 bne 2f /*nodbg*/
>> 2966 addq.w #4,%a1
>> 2967 cmp.b #'$',%a1@
>> 2968 bne 2f /*nodbg*/
>> 2969 /* signature OK */
>> 2970 lea %pc@(L(q40_do_debug)),%a1
>> 2971 tas %a1@
>> 2972 /*nodbg: q40_do_debug is 0 by default*/
>> 2973 2:
>> 2974 #endif
>> 2975
>> 2976 #ifdef CONFIG_APOLLO
>> 2977 /* We count on the PROM initializing SIO1 */
>> 2978 #endif
>> 2979
>> 2980 #ifdef CONFIG_HP300
>> 2981 /* We count on the boot loader initialising the UART */
>> 2982 #endif
>> 2983
>> 2984 L(serial_init_done):
>> 2985 func_return serial_init
>> 2986
>> 2987 /*
>> 2988 * Output character on serial port.
>> 2989 */
>> 2990 func_start serial_putc,%d0/%d1/%a0/%a1
>> 2991
>> 2992 movel ARG1,%d0
>> 2993 cmpib #'\n',%d0
>> 2994 jbne 1f
>> 2995
>> 2996 /* A little safe recursion is good for the soul */
>> 2997 serial_putc #'\r'
>> 2998 1:
>> 2999
>> 3000 #ifdef CONFIG_AMIGA
>> 3001 is_not_amiga(2f)
>> 3002 andw #0x00ff,%d0
>> 3003 oriw #0x0100,%d0
>> 3004 movel %pc@(L(custom)),%a0
>> 3005 movew %d0,%a0@(CUSTOMBASE+C_SERDAT)
>> 3006 1: movew %a0@(CUSTOMBASE+C_SERDATR),%d0
>> 3007 andw #0x2000,%d0
>> 3008 jeq 1b
>> 3009 jra L(serial_putc_done)
>> 3010 2:
>> 3011 #endif
>> 3012
>> 3013 #ifdef CONFIG_MAC
>> 3014 is_not_mac(5f)
>> 3015
>> 3016 #ifdef SERIAL_DEBUG
>> 3017
>> 3018 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 3019 movel %pc@(L(mac_sccbase)),%a1
>> 3020 #endif
>> 3021
>> 3022 #ifdef MAC_USE_SCC_A
>> 3023 3: btst #2,%a1@(mac_scc_cha_a_ctrl_offset)
>> 3024 jeq 3b
>> 3025 moveb %d0,%a1@(mac_scc_cha_a_data_offset)
>> 3026 #endif /* MAC_USE_SCC_A */
>> 3027
>> 3028 #ifdef MAC_USE_SCC_B
>> 3029 4: btst #2,%a1@(mac_scc_cha_b_ctrl_offset)
>> 3030 jeq 4b
>> 3031 moveb %d0,%a1@(mac_scc_cha_b_data_offset)
>> 3032 #endif /* MAC_USE_SCC_B */
>> 3033
>> 3034 #endif /* SERIAL_DEBUG */
>> 3035
>> 3036 jra L(serial_putc_done)
>> 3037 5:
>> 3038 #endif /* CONFIG_MAC */
>> 3039
>> 3040 #ifdef CONFIG_ATARI
>> 3041 is_not_atari(4f)
>> 3042 movel %pc@(L(iobase)),%a1
>> 3043 #if defined(USE_PRINTER)
>> 3044 3: btst #0,%a1@(LSTMFP_GPIP)
>> 3045 jne 3b
>> 3046 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 3047 moveb %d0,%a1@(LPSG_WRITE)
>> 3048 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 3049 moveb %a1@(LPSG_READ),%d0
>> 3050 bclr #5,%d0
>> 3051 moveb %d0,%a1@(LPSG_WRITE)
>> 3052 nop
>> 3053 nop
>> 3054 bset #5,%d0
>> 3055 moveb %d0,%a1@(LPSG_WRITE)
>> 3056 #elif defined(USE_SCC)
>> 3057 3: btst #2,%a1@(LSCC_CTRL)
>> 3058 jeq 3b
>> 3059 moveb %d0,%a1@(LSCC_DATA)
>> 3060 #elif defined(USE_MFP)
>> 3061 3: btst #7,%a1@(LMFP_TSR)
>> 3062 jeq 3b
>> 3063 moveb %d0,%a1@(LMFP_UDR)
>> 3064 #endif
>> 3065 jra L(serial_putc_done)
>> 3066 4:
>> 3067 #endif /* CONFIG_ATARI */
>> 3068
>> 3069 #ifdef CONFIG_MVME147
>> 3070 is_not_mvme147(2f)
>> 3071 1: btst #2,M147_SCC_CTRL_A
>> 3072 jeq 1b
>> 3073 moveb %d0,M147_SCC_DATA_A
>> 3074 jbra L(serial_putc_done)
>> 3075 2:
>> 3076 #endif
>> 3077
>> 3078 #ifdef CONFIG_MVME16x
>> 3079 is_not_mvme16x(2f)
>> 3080 /*
>> 3081 * If the loader gave us a board type then we can use that to
>> 3082 * select an appropriate output routine; otherwise we just use
>> 3083 * the Bug code. If we have to use the Bug that means the Bug
>> 3084 * workspace has to be valid, which means the Bug has to use
>> 3085 * the SRAM, which is non-standard.
>> 3086 */
>> 3087 moveml %d0-%d7/%a2-%a6,%sp@-
>> 3088 movel vme_brdtype,%d1
>> 3089 jeq 1f | No tag - use the Bug
>> 3090 cmpi #VME_TYPE_MVME162,%d1
>> 3091 jeq 6f
>> 3092 cmpi #VME_TYPE_MVME172,%d1
>> 3093 jne 5f
>> 3094 /* 162/172; it's an SCC */
>> 3095 6: btst #2,M162_SCC_CTRL_A
>> 3096 nop
>> 3097 nop
>> 3098 nop
>> 3099 jeq 6b
>> 3100 moveb #8,M162_SCC_CTRL_A
>> 3101 nop
>> 3102 nop
>> 3103 nop
>> 3104 moveb %d0,M162_SCC_CTRL_A
>> 3105 jra 3f
>> 3106 5:
>> 3107 /* 166/167/177; it's a CD2401 */
>> 3108 moveb #0,M167_CYCAR
>> 3109 moveb M167_CYIER,%d2
>> 3110 moveb #0x02,M167_CYIER
>> 3111 7:
>> 3112 btst #5,M167_PCSCCTICR
>> 3113 jeq 7b
>> 3114 moveb M167_PCTPIACKR,%d1
>> 3115 moveb M167_CYLICR,%d1
>> 3116 jeq 8f
>> 3117 moveb #0x08,M167_CYTEOIR
>> 3118 jra 7b
>> 3119 8:
>> 3120 moveb %d0,M167_CYTDR
>> 3121 moveb #0,M167_CYTEOIR
>> 3122 moveb %d2,M167_CYIER
>> 3123 jra 3f
>> 3124 1:
>> 3125 moveb %d0,%sp@-
>> 3126 trap #15
>> 3127 .word 0x0020 /* TRAP 0x020 */
>> 3128 3:
>> 3129 moveml %sp@+,%d0-%d7/%a2-%a6
>> 3130 jbra L(serial_putc_done)
>> 3131 2:
>> 3132 #endif /* CONFIG_MVME16x */
>> 3133
>> 3134 #ifdef CONFIG_BVME6000
>> 3135 is_not_bvme6000(2f)
>> 3136 /*
>> 3137 * The BVME6000 machine has a serial port ...
>> 3138 */
>> 3139 1: btst #2,BVME_SCC_CTRL_A
>> 3140 jeq 1b
>> 3141 moveb %d0,BVME_SCC_DATA_A
>> 3142 jbra L(serial_putc_done)
>> 3143 2:
>> 3144 #endif
>> 3145
>> 3146 #ifdef CONFIG_SUN3X
>> 3147 is_not_sun3x(2f)
>> 3148 movel %d0,-(%sp)
>> 3149 movel 0xFEFE0018,%a1
>> 3150 jbsr (%a1)
>> 3151 addq #4,%sp
>> 3152 jbra L(serial_putc_done)
>> 3153 2:
>> 3154 #endif
>> 3155
>> 3156 #ifdef CONFIG_Q40
>> 3157 is_not_q40(2f)
>> 3158 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */
>> 3159 beq 2f
>> 3160 lea %pc@(q40_mem_cptr),%a1
>> 3161 move.l %a1@,%a0
>> 3162 move.b %d0,%a0@
>> 3163 addq.l #4,%a0
>> 3164 move.l %a0,%a1@
>> 3165 jbra L(serial_putc_done)
>> 3166 2:
>> 3167 #endif
>> 3168
>> 3169 #ifdef CONFIG_APOLLO
>> 3170 is_not_apollo(2f)
>> 3171 movl %pc@(L(iobase)),%a1
>> 3172 moveb %d0,%a1@(LTHRB0)
>> 3173 1: moveb %a1@(LSRB0),%d0
>> 3174 andb #0x4,%d0
>> 3175 beq 1b
>> 3176 jbra L(serial_putc_done)
>> 3177 2:
>> 3178 #endif
>> 3179
>> 3180 #ifdef CONFIG_HP300
>> 3181 is_not_hp300(3f)
>> 3182 movl %pc@(L(iobase)),%a1
>> 3183 addl %pc@(L(uartbase)),%a1
>> 3184 movel %pc@(L(uart_scode)),%d1 /* Check the scode */
>> 3185 jmi 3f /* Unset? Exit */
>> 3186 cmpi #256,%d1 /* APCI scode? */
>> 3187 jeq 2f
>> 3188 1: moveb %a1@(DCALSR),%d1 /* Output to DCA */
>> 3189 andb #0x20,%d1
>> 3190 beq 1b
>> 3191 moveb %d0,%a1@(DCADATA)
>> 3192 jbra L(serial_putc_done)
>> 3193 2: moveb %a1@(APCILSR),%d1 /* Output to APCI */
>> 3194 andb #0x20,%d1
>> 3195 beq 2b
>> 3196 moveb %d0,%a1@(APCIDATA)
>> 3197 jbra L(serial_putc_done)
>> 3198 3:
>> 3199 #endif
>> 3200
>> 3201 L(serial_putc_done):
>> 3202 func_return serial_putc
>> 3203
>> 3204 /*
>> 3205 * Output a string.
>> 3206 */
>> 3207 func_start puts,%d0/%a0
>> 3208
>> 3209 movel ARG1,%a0
>> 3210 jra 2f
>> 3211 1:
>> 3212 #ifdef CONSOLE
>> 3213 console_putc %d0
>> 3214 #endif
>> 3215 #ifdef SERIAL_DEBUG
>> 3216 serial_putc %d0
>> 3217 #endif
>> 3218 2: moveb %a0@+,%d0
>> 3219 jne 1b
>> 3220
>> 3221 func_return puts
>> 3222
>> 3223 /*
>> 3224 * Output number in hex notation.
>> 3225 */
>> 3226
>> 3227 func_start putn,%d0-%d2
>> 3228
>> 3229 putc ' '
>> 3230
>> 3231 movel ARG1,%d0
>> 3232 moveq #7,%d1
>> 3233 1: roll #4,%d0
>> 3234 move %d0,%d2
>> 3235 andb #0x0f,%d2
>> 3236 addb #'0',%d2
>> 3237 cmpb #'9',%d2
>> 3238 jls 2f
>> 3239 addb #'A'-('9'+1),%d2
>> 3240 2:
>> 3241 #ifdef CONSOLE
>> 3242 console_putc %d2
>> 3243 #endif
>> 3244 #ifdef SERIAL_DEBUG
>> 3245 serial_putc %d2
>> 3246 #endif
>> 3247 dbra %d1,1b
>> 3248
>> 3249 func_return putn
>> 3250
>> 3251 #ifdef CONFIG_MAC
>> 3252 /*
>> 3253 * mac_early_print
>> 3254 *
>> 3255 * This routine takes its parameters on the stack. It then
>> 3256 * turns around and calls the internal routines. This routine
>> 3257 * is used by the boot console.
>> 3258 *
>> 3259 * The calling parameters are:
>> 3260 * void mac_early_print(const char *str, unsigned length);
>> 3261 *
>> 3262 * This routine does NOT understand variable arguments only
>> 3263 * simple strings!
>> 3264 */
>> 3265 ENTRY(mac_early_print)
>> 3266 moveml %d0/%d1/%a0,%sp@-
>> 3267 movew %sr,%sp@-
>> 3268 ori #0x0700,%sr
>> 3269 movel %sp@(18),%a0 /* fetch parameter */
>> 3270 movel %sp@(22),%d1 /* fetch parameter */
>> 3271 jra 2f
>> 3272 1:
>> 3273 #ifdef CONSOLE
>> 3274 console_putc %d0
>> 3275 #endif
>> 3276 #ifdef SERIAL_DEBUG
>> 3277 serial_putc %d0
>> 3278 #endif
>> 3279 subq #1,%d1
>> 3280 2: jeq 3f
>> 3281 moveb %a0@+,%d0
>> 3282 jne 1b
>> 3283 3:
>> 3284 movew %sp@+,%sr
>> 3285 moveml %sp@+,%d0/%d1/%a0
>> 3286 rts
>> 3287 #endif /* CONFIG_MAC */
>> 3288
>> 3289 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3290 func_start set_leds,%d0/%a0
>> 3291 movel ARG1,%d0
>> 3292 #ifdef CONFIG_HP300
>> 3293 is_not_hp300(1f)
>> 3294 movel %pc@(L(iobase)),%a0
>> 3295 moveb %d0,%a0@(0x1ffff)
>> 3296 jra 2f
>> 3297 #endif
>> 3298 1:
>> 3299 #ifdef CONFIG_APOLLO
>> 3300 movel %pc@(L(iobase)),%a0
>> 3301 lsll #8,%d0
>> 3302 eorw #0xff00,%d0
>> 3303 moveb %d0,%a0@(LCPUCTRL)
>> 3304 #endif
>> 3305 2:
>> 3306 func_return set_leds
>> 3307 #endif
>> 3308
>> 3309 #ifdef CONSOLE
>> 3310 /*
>> 3311 * For continuity, see the data alignment
>> 3312 * to which this structure is tied.
>> 3313 */
>> 3314 #define Lconsole_struct_cur_column 0
>> 3315 #define Lconsole_struct_cur_row 4
>> 3316 #define Lconsole_struct_num_columns 8
>> 3317 #define Lconsole_struct_num_rows 12
>> 3318 #define Lconsole_struct_left_edge 16
>> 3319 #define Lconsole_struct_penguin_putc 20
>> 3320
>> 3321 func_start console_init,%a0-%a4/%d0-%d7
>> 3322 /*
>> 3323 * Some of the register usage that follows
>> 3324 * a0 = pointer to boot_info
>> 3325 * a1 = pointer to screen
>> 3326 * a2 = pointer to Lconsole_globals
>> 3327 * d3 = pixel width of screen
>> 3328 * d4 = pixel height of screen
>> 3329 * (d3,d4) ~= (x,y) of a point just below
>> 3330 * and to the right of the screen
>> 3331 * NOT on the screen!
>> 3332 * d5 = number of bytes per scan line
>> 3333 * d6 = number of bytes on the entire screen
>> 3334 */
>> 3335
>> 3336 lea %pc@(L(console_globals)),%a2
>> 3337 movel %pc@(L(mac_videobase)),%a1
>> 3338 movel %pc@(L(mac_rowbytes)),%d5
>> 3339 movel %pc@(L(mac_dimensions)),%d3 /* -> low byte */
>> 3340 movel %d3,%d4
>> 3341 swap %d4 /* -> high byte */
>> 3342 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3343 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3344
>> 3345 movel %d5,%d6
>> 3346 | subl #20,%d6
>> 3347 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3348 divul #8,%d6 /* we'll clear 8 bytes at a time */
>> 3349 moveq #-1,%d0 /* Mac_black */
>> 3350 subq #1,%d6
>> 3351
>> 3352 L(console_clear_loop):
>> 3353 movel %d0,%a1@+
>> 3354 movel %d0,%a1@+
>> 3355 dbra %d6,L(console_clear_loop)
>> 3356
>> 3357 /* Calculate font size */
>> 3358
>> 3359 #if defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
>> 3360 lea %pc@(font_vga_8x8),%a0
>> 3361 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
>> 3362 lea %pc@(font_vga_8x16),%a0
>> 3363 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
>> 3364 lea %pc@(font_vga_6x11),%a0
>> 3365 #elif defined(CONFIG_FONT_8x8) /* default */
>> 3366 lea %pc@(font_vga_8x8),%a0
>> 3367 #else /* no compiled-in font */
>> 3368 lea 0,%a0
>> 3369 #endif
>> 3370
>> 3371 /*
>> 3372 * At this point we make a shift in register usage
>> 3373 * a1 = address of console_font pointer
>> 3374 */
>> 3375 lea %pc@(L(console_font)),%a1
>> 3376 movel %a0,%a1@ /* store pointer to struct fbcon_font_desc in console_font */
>> 3377 tstl %a0
>> 3378 jeq 1f
>> 3379 lea %pc@(L(console_font_data)),%a4
>> 3380 movel %a0@(FONT_DESC_DATA),%d0
>> 3381 subl #L(console_font),%a1
>> 3382 addl %a1,%d0
>> 3383 movel %d0,%a4@
>> 3384
>> 3385 /*
>> 3386 * Calculate global maxs
>> 3387 * Note - we can use either an
>> 3388 * 8 x 16 or 8 x 8 character font
>> 3389 * 6 x 11 also supported
>> 3390 */
>> 3391 /* ASSERT: a0 = contents of Lconsole_font */
>> 3392 movel %d3,%d0 /* screen width in pixels */
>> 3393 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */
>> 3394
>> 3395 movel %d4,%d1 /* screen height in pixels */
>> 3396 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */
>> 3397
>> 3398 movel %d0,%a2@(Lconsole_struct_num_columns)
>> 3399 movel %d1,%a2@(Lconsole_struct_num_rows)
>> 3400
>> 3401 /*
>> 3402 * Clear the current row and column
>> 3403 */
>> 3404 clrl %a2@(Lconsole_struct_cur_column)
>> 3405 clrl %a2@(Lconsole_struct_cur_row)
>> 3406 clrl %a2@(Lconsole_struct_left_edge)
>> 3407
>> 3408 /*
>> 3409 * Initialization is complete
>> 3410 */
>> 3411 1:
>> 3412 func_return console_init
>> 3413
>> 3414 func_start console_put_stats,%a0/%d7
>> 3415 /*
>> 3416 * Some of the register usage that follows
>> 3417 * a0 = pointer to boot_info
>> 3418 * d7 = value of boot_info fields
>> 3419 */
>> 3420 puts "\nMacLinux\n"
>> 3421
>> 3422 #ifdef SERIAL_DEBUG
>> 3423 puts "\n vidaddr:"
>> 3424 putn %pc@(L(mac_videobase)) /* video addr. */
>> 3425
>> 3426 puts "\n _stext:"
>> 3427 lea %pc@(_stext),%a0
>> 3428 putn %a0
>> 3429
>> 3430 puts "\nbootinfo:"
>> 3431 lea %pc@(_end),%a0
>> 3432 putn %a0
>> 3433
>> 3434 puts "\n cpuid:"
>> 3435 putn %pc@(L(cputype))
>> 3436
>> 3437 # ifdef CONFIG_MAC
>> 3438 puts "\n sccbase:"
>> 3439 putn %pc@(L(mac_sccbase))
>> 3440 # endif
>> 3441 # ifdef MMU_PRINT
>> 3442 putc '\n'
>> 3443 jbsr mmu_print_machine_cpu_types
>> 3444 # endif
>> 3445 #endif /* SERIAL_DEBUG */
>> 3446
>> 3447 putc '\n'
>> 3448
>> 3449 func_return console_put_stats
>> 3450
>> 3451 #ifdef CONSOLE_PENGUIN
>> 3452 func_start console_put_penguin,%a0-%a1/%d0-%d7
>> 3453 /*
>> 3454 * Get 'that_penguin' onto the screen in the upper right corner
>> 3455 * penguin is 64 x 74 pixels, align against right edge of screen
>> 3456 */
>> 3457 lea %pc@(L(mac_dimensions)),%a0
>> 3458 movel %a0@,%d0
>> 3459 andil #0xffff,%d0
>> 3460 subil #64,%d0 /* snug up against the right edge */
>> 3461 clrl %d1 /* start at the top */
>> 3462 movel #73,%d7
>> 3463 lea %pc@(L(that_penguin)),%a1
>> 3464 L(console_penguin_row):
>> 3465 movel #31,%d6
>> 3466 L(console_penguin_pixel_pair):
>> 3467 moveb %a1@,%d2
>> 3468 lsrb #4,%d2
>> 3469 console_plot_pixel %d0,%d1,%d2
>> 3470 addq #1,%d0
>> 3471 moveb %a1@+,%d2
>> 3472 console_plot_pixel %d0,%d1,%d2
>> 3473 addq #1,%d0
>> 3474 dbra %d6,L(console_penguin_pixel_pair)
>> 3475
>> 3476 subil #64,%d0
>> 3477 addq #1,%d1
>> 3478 dbra %d7,L(console_penguin_row)
>> 3479
>> 3480 func_return console_put_penguin
>> 3481
>> 3482 /* include penguin bitmap */
>> 3483 L(that_penguin):
>> 3484 #include "../mac/mac_penguin.S"
>> 3485 #endif
>> 3486
>> 3487 /*
>> 3488 * Calculate source and destination addresses
>> 3489 * output a1 = dest
>> 3490 * a2 = source
>> 3491 */
>> 3492
>> 3493 func_start console_scroll,%a0-%a4/%d0-%d7
>> 3494 lea %pc@(L(mac_videobase)),%a0
>> 3495 movel %a0@,%a1
>> 3496 movel %a1,%a2
>> 3497 lea %pc@(L(mac_rowbytes)),%a0
>> 3498 movel %a0@,%d5
>> 3499 movel %pc@(L(console_font)),%a0
>> 3500 tstl %a0
>> 3501 jeq 1f
>> 3502 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */
>> 3503 addal %d5,%a2
>> 3504
>> 3505 /*
>> 3506 * Get dimensions
>> 3507 */
>> 3508 lea %pc@(L(mac_dimensions)),%a0
>> 3509 movel %a0@,%d3
>> 3510 movel %d3,%d4
>> 3511 swap %d4
>> 3512 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3513 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3514
>> 3515 /*
>> 3516 * Calculate number of bytes to move
>> 3517 */
>> 3518 lea %pc@(L(mac_rowbytes)),%a0
>> 3519 movel %a0@,%d6
>> 3520 movel %pc@(L(console_font)),%a0
>> 3521 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */
>> 3522 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3523 divul #32,%d6 /* we'll move 8 longs at a time */
>> 3524 subq #1,%d6
>> 3525
>> 3526 L(console_scroll_loop):
>> 3527 movel %a2@+,%a1@+
>> 3528 movel %a2@+,%a1@+
>> 3529 movel %a2@+,%a1@+
>> 3530 movel %a2@+,%a1@+
>> 3531 movel %a2@+,%a1@+
>> 3532 movel %a2@+,%a1@+
>> 3533 movel %a2@+,%a1@+
>> 3534 movel %a2@+,%a1@+
>> 3535 dbra %d6,L(console_scroll_loop)
>> 3536
>> 3537 lea %pc@(L(mac_rowbytes)),%a0
>> 3538 movel %a0@,%d6
>> 3539 movel %pc@(L(console_font)),%a0
>> 3540 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */
>> 3541 divul #32,%d6 /* we'll move 8 words at a time */
>> 3542 subq #1,%d6
>> 3543
>> 3544 moveq #-1,%d0
>> 3545 L(console_scroll_clear_loop):
>> 3546 movel %d0,%a1@+
>> 3547 movel %d0,%a1@+
>> 3548 movel %d0,%a1@+
>> 3549 movel %d0,%a1@+
>> 3550 movel %d0,%a1@+
>> 3551 movel %d0,%a1@+
>> 3552 movel %d0,%a1@+
>> 3553 movel %d0,%a1@+
>> 3554 dbra %d6,L(console_scroll_clear_loop)
>> 3555
>> 3556 1:
>> 3557 func_return console_scroll
>> 3558
>> 3559
>> 3560 func_start console_putc,%a0/%a1/%d0-%d7
>> 3561
>> 3562 is_not_mac(L(console_exit))
>> 3563 tstl %pc@(L(console_font))
>> 3564 jeq L(console_exit)
>> 3565
>> 3566 /* Output character in d7 on console.
>> 3567 */
>> 3568 movel ARG1,%d7
>> 3569 cmpib #'\n',%d7
>> 3570 jbne 1f
>> 3571
>> 3572 /* A little safe recursion is good for the soul */
>> 3573 console_putc #'\r'
>> 3574 1:
>> 3575 lea %pc@(L(console_globals)),%a0
>> 3576
>> 3577 cmpib #10,%d7
>> 3578 jne L(console_not_lf)
>> 3579 movel %a0@(Lconsole_struct_cur_row),%d0
>> 3580 addil #1,%d0
>> 3581 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3582 movel %a0@(Lconsole_struct_num_rows),%d1
>> 3583 cmpl %d1,%d0
>> 3584 jcs 1f
>> 3585 subil #1,%d0
>> 3586 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3587 console_scroll
>> 3588 1:
>> 3589 jra L(console_exit)
>> 3590
>> 3591 L(console_not_lf):
>> 3592 cmpib #13,%d7
>> 3593 jne L(console_not_cr)
>> 3594 clrl %a0@(Lconsole_struct_cur_column)
>> 3595 jra L(console_exit)
>> 3596
>> 3597 L(console_not_cr):
>> 3598 cmpib #1,%d7
>> 3599 jne L(console_not_home)
>> 3600 clrl %a0@(Lconsole_struct_cur_row)
>> 3601 clrl %a0@(Lconsole_struct_cur_column)
>> 3602 jra L(console_exit)
>> 3603
>> 3604 /*
>> 3605 * At this point we know that the %d7 character is going to be
>> 3606 * rendered on the screen. Register usage is -
>> 3607 * a0 = pointer to console globals
>> 3608 * a1 = font data
>> 3609 * d0 = cursor column
>> 3610 * d1 = cursor row to draw the character
>> 3611 * d7 = character number
>> 3612 */
>> 3613 L(console_not_home):
>> 3614 movel %a0@(Lconsole_struct_cur_column),%d0
>> 3615 addql #1,%a0@(Lconsole_struct_cur_column)
>> 3616 movel %a0@(Lconsole_struct_num_columns),%d1
>> 3617 cmpl %d1,%d0
>> 3618 jcs 1f
>> 3619 console_putc #'\n' /* recursion is OK! */
>> 3620 1:
>> 3621 movel %a0@(Lconsole_struct_cur_row),%d1
>> 3622
>> 3623 /*
>> 3624 * At this point we make a shift in register usage
>> 3625 * a0 = address of pointer to font data (fbcon_font_desc)
>> 3626 */
>> 3627 movel %pc@(L(console_font)),%a0
>> 3628 movel %pc@(L(console_font_data)),%a1 /* Load fbcon_font_desc.data into a1 */
>> 3629 andl #0x000000ff,%d7
>> 3630 /* ASSERT: a0 = contents of Lconsole_font */
>> 3631 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */
>> 3632 addl %d7,%a1 /* a1 = points to char image */
>> 3633
>> 3634 /*
>> 3635 * At this point we make a shift in register usage
>> 3636 * d0 = pixel coordinate, x
>> 3637 * d1 = pixel coordinate, y
>> 3638 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen
>> 3639 * d3 = font scan line data (8 pixels)
>> 3640 * d6 = count down for the font's pixel width (8)
>> 3641 * d7 = count down for the font's pixel count in height
>> 3642 */
>> 3643 /* ASSERT: a0 = contents of Lconsole_font */
>> 3644 mulul %a0@(FONT_DESC_WIDTH),%d0
>> 3645 mulul %a0@(FONT_DESC_HEIGHT),%d1
>> 3646 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load fbcon_font_desc.height into d7 */
>> 3647 subq #1,%d7
>> 3648 L(console_read_char_scanline):
>> 3649 moveb %a1@+,%d3
>> 3650
>> 3651 /* ASSERT: a0 = contents of Lconsole_font */
>> 3652 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */
>> 3653 subql #1,%d6
>> 3654
>> 3655 L(console_do_font_scanline):
>> 3656 lslb #1,%d3
>> 3657 scsb %d2 /* convert 1 bit into a byte */
>> 3658 console_plot_pixel %d0,%d1,%d2
>> 3659 addq #1,%d0
>> 3660 dbra %d6,L(console_do_font_scanline)
>> 3661
>> 3662 /* ASSERT: a0 = contents of Lconsole_font */
>> 3663 subl %a0@(FONT_DESC_WIDTH),%d0
>> 3664 addq #1,%d1
>> 3665 dbra %d7,L(console_read_char_scanline)
>> 3666
>> 3667 L(console_exit):
>> 3668 func_return console_putc
>> 3669
>> 3670 /*
>> 3671 * Input:
>> 3672 * d0 = x coordinate
>> 3673 * d1 = y coordinate
>> 3674 * d2 = (bit 0) 1/0 for white/black (!)
>> 3675 * All registers are preserved
>> 3676 */
>> 3677 func_start console_plot_pixel,%a0-%a1/%d0-%d4
>> 3678
>> 3679 movel %pc@(L(mac_videobase)),%a1
>> 3680 movel %pc@(L(mac_videodepth)),%d3
>> 3681 movel ARG1,%d0
>> 3682 movel ARG2,%d1
>> 3683 mulul %pc@(L(mac_rowbytes)),%d1
>> 3684 movel ARG3,%d2
>> 3685
>> 3686 /*
>> 3687 * Register usage:
>> 3688 * d0 = x coord becomes byte offset into frame buffer
>> 3689 * d1 = y coord
>> 3690 * d2 = black or white (0/1)
>> 3691 * d3 = video depth
>> 3692 * d4 = temp of x (d0) for many bit depths
>> 3693 */
>> 3694 L(test_1bit):
>> 3695 cmpb #1,%d3
>> 3696 jbne L(test_2bit)
>> 3697 movel %d0,%d4 /* we need the low order 3 bits! */
>> 3698 divul #8,%d0
>> 3699 addal %d0,%a1
>> 3700 addal %d1,%a1
>> 3701 andb #7,%d4
>> 3702 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3703 andb #1,%d2
>> 3704 jbne L(white_1)
>> 3705 bsetb %d4,%a1@
>> 3706 jbra L(console_plot_pixel_exit)
>> 3707 L(white_1):
>> 3708 bclrb %d4,%a1@
>> 3709 jbra L(console_plot_pixel_exit)
>> 3710
>> 3711 L(test_2bit):
>> 3712 cmpb #2,%d3
>> 3713 jbne L(test_4bit)
>> 3714 movel %d0,%d4 /* we need the low order 2 bits! */
>> 3715 divul #4,%d0
>> 3716 addal %d0,%a1
>> 3717 addal %d1,%a1
>> 3718 andb #3,%d4
>> 3719 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3720 lsll #1,%d4 /* ! */
>> 3721 andb #1,%d2
>> 3722 jbne L(white_2)
>> 3723 bsetb %d4,%a1@
>> 3724 addq #1,%d4
>> 3725 bsetb %d4,%a1@
>> 3726 jbra L(console_plot_pixel_exit)
>> 3727 L(white_2):
>> 3728 bclrb %d4,%a1@
>> 3729 addq #1,%d4
>> 3730 bclrb %d4,%a1@
>> 3731 jbra L(console_plot_pixel_exit)
>> 3732
>> 3733 L(test_4bit):
>> 3734 cmpb #4,%d3
>> 3735 jbne L(test_8bit)
>> 3736 movel %d0,%d4 /* we need the low order bit! */
>> 3737 divul #2,%d0
>> 3738 addal %d0,%a1
>> 3739 addal %d1,%a1
>> 3740 andb #1,%d4
>> 3741 eorb #1,%d4
>> 3742 lsll #2,%d4 /* ! */
>> 3743 andb #1,%d2
>> 3744 jbne L(white_4)
>> 3745 bsetb %d4,%a1@
>> 3746 addq #1,%d4
>> 3747 bsetb %d4,%a1@
>> 3748 addq #1,%d4
>> 3749 bsetb %d4,%a1@
>> 3750 addq #1,%d4
>> 3751 bsetb %d4,%a1@
>> 3752 jbra L(console_plot_pixel_exit)
>> 3753 L(white_4):
>> 3754 bclrb %d4,%a1@
>> 3755 addq #1,%d4
>> 3756 bclrb %d4,%a1@
>> 3757 addq #1,%d4
>> 3758 bclrb %d4,%a1@
>> 3759 addq #1,%d4
>> 3760 bclrb %d4,%a1@
>> 3761 jbra L(console_plot_pixel_exit)
>> 3762
>> 3763 L(test_8bit):
>> 3764 cmpb #8,%d3
>> 3765 jbne L(test_16bit)
>> 3766 addal %d0,%a1
>> 3767 addal %d1,%a1
>> 3768 andb #1,%d2
>> 3769 jbne L(white_8)
>> 3770 moveb #0xff,%a1@
>> 3771 jbra L(console_plot_pixel_exit)
>> 3772 L(white_8):
>> 3773 clrb %a1@
>> 3774 jbra L(console_plot_pixel_exit)
>> 3775
>> 3776 L(test_16bit):
>> 3777 cmpb #16,%d3
>> 3778 jbne L(console_plot_pixel_exit)
>> 3779 addal %d0,%a1
>> 3780 addal %d0,%a1
>> 3781 addal %d1,%a1
>> 3782 andb #1,%d2
>> 3783 jbne L(white_16)
>> 3784 clrw %a1@
>> 3785 jbra L(console_plot_pixel_exit)
>> 3786 L(white_16):
>> 3787 movew #0x0fff,%a1@
>> 3788 jbra L(console_plot_pixel_exit)
>> 3789
>> 3790 L(console_plot_pixel_exit):
>> 3791 func_return console_plot_pixel
>> 3792 #endif /* CONSOLE */
>> 3793
>> 3794 #if 0
>> 3795 /*
>> 3796 * This is some old code lying around. I don't believe
>> 3797 * it's used or important anymore. My guess is it contributed
>> 3798 * to getting to this point, but it's done for now.
>> 3799 * It was still in the 2.1.77 head.S, so it's still here.
>> 3800 * (And still not used!)
>> 3801 */
>> 3802 L(showtest):
>> 3803 moveml %a0/%d7,%sp@-
>> 3804 puts "A="
>> 3805 putn %a1
>> 3806
>> 3807 .long 0xf0119f15 | ptestr #5,%a1@,#7,%a0
>> 3808
>> 3809 puts "DA="
>> 3810 putn %a0
>> 3811
>> 3812 puts "D="
>> 3813 putn %a0@
>> 3814
>> 3815 puts "S="
>> 3816 lea %pc@(L(mmu)),%a0
>> 3817 .long 0xf0106200 | pmove %psr,%a0@
>> 3818 clrl %d7
>> 3819 movew %a0@,%d7
>> 3820 putn %d7
>> 3821
>> 3822 putc '\n'
>> 3823 moveml %sp@+,%a0/%d7
>> 3824 rts
>> 3825 #endif /* 0 */
>> 3826
>> 3827 __INITDATA
>> 3828 .align 4
>> 3829
>> 3830 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
>> 3831 defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3832 L(custom):
>> 3833 L(iobase):
>> 3834 .long 0
>> 3835 #endif
>> 3836
>> 3837 #if defined(CONSOLE)
>> 3838 L(console_globals):
>> 3839 .long 0 /* cursor column */
>> 3840 .long 0 /* cursor row */
>> 3841 .long 0 /* max num columns */
>> 3842 .long 0 /* max num rows */
>> 3843 .long 0 /* left edge */
>> 3844 .long 0 /* mac putc */
>> 3845 L(console_font):
>> 3846 .long 0 /* pointer to console font (struct font_desc) */
>> 3847 L(console_font_data):
>> 3848 .long 0 /* pointer to console font data */
>> 3849 #endif /* CONSOLE */
>> 3850
>> 3851 #if defined(MMU_PRINT)
>> 3852 L(mmu_print_data):
>> 3853 .long 0 /* valid flag */
>> 3854 .long 0 /* start logical */
>> 3855 .long 0 /* next logical */
>> 3856 .long 0 /* start physical */
>> 3857 .long 0 /* next physical */
>> 3858 #endif /* MMU_PRINT */
>> 3859
>> 3860 L(cputype):
>> 3861 .long 0
>> 3862 L(mmu_cached_pointer_tables):
>> 3863 .long 0
>> 3864 L(mmu_num_pointer_tables):
>> 3865 .long 0
>> 3866 L(phys_kernel_start):
>> 3867 .long 0
>> 3868 L(kernel_end):
>> 3869 .long 0
>> 3870 L(memory_start):
>> 3871 .long 0
>> 3872 L(kernel_pgdir_ptr):
>> 3873 .long 0
>> 3874 L(temp_mmap_mem):
>> 3875 .long 0
>> 3876
>> 3877 #if defined (CONFIG_MVME147)
>> 3878 M147_SCC_CTRL_A = 0xfffe3002
>> 3879 M147_SCC_DATA_A = 0xfffe3003
>> 3880 #endif
>> 3881
>> 3882 #if defined (CONFIG_MVME16x)
>> 3883 M162_SCC_CTRL_A = 0xfff45005
>> 3884 M167_CYCAR = 0xfff450ee
>> 3885 M167_CYIER = 0xfff45011
>> 3886 M167_CYLICR = 0xfff45026
>> 3887 M167_CYTEOIR = 0xfff45085
>> 3888 M167_CYTDR = 0xfff450f8
>> 3889 M167_PCSCCTICR = 0xfff4201e
>> 3890 M167_PCTPIACKR = 0xfff42025
>> 3891 #endif
>> 3892
>> 3893 #if defined (CONFIG_BVME6000)
>> 3894 BVME_SCC_CTRL_A = 0xffb0000b
>> 3895 BVME_SCC_DATA_A = 0xffb0000f
>> 3896 #endif
>> 3897
>> 3898 #if defined(CONFIG_MAC)
>> 3899 L(mac_booter_data):
>> 3900 .long 0
>> 3901 L(mac_videobase):
>> 3902 .long 0
>> 3903 L(mac_videodepth):
>> 3904 .long 0
>> 3905 L(mac_dimensions):
>> 3906 .long 0
>> 3907 L(mac_rowbytes):
>> 3908 .long 0
>> 3909 #ifdef SERIAL_DEBUG
>> 3910 L(mac_sccbase):
>> 3911 .long 0
>> 3912 #endif
>> 3913 #endif /* CONFIG_MAC */
>> 3914
>> 3915 #if defined (CONFIG_APOLLO)
>> 3916 LSRB0 = 0x10412
>> 3917 LTHRB0 = 0x10416
>> 3918 LCPUCTRL = 0x10100
>> 3919 #endif
>> 3920
>> 3921 #if defined(CONFIG_HP300)
>> 3922 DCADATA = 0x11
>> 3923 DCALSR = 0x1b
>> 3924 APCIDATA = 0x00
>> 3925 APCILSR = 0x14
>> 3926 L(uartbase):
>> 3927 .long 0
>> 3928 L(uart_scode):
>> 3929 .long -1
>> 3930 #endif
>> 3931
>> 3932 __FINIT
>> 3933 .data
>> 3934 .align 4
>> 3935
>> 3936 availmem:
>> 3937 .long 0
>> 3938 m68k_pgtable_cachemode:
>> 3939 .long 0
>> 3940 m68k_supervisor_cachemode:
>> 3941 .long 0
>> 3942 #if defined(CONFIG_MVME16x)
>> 3943 mvme_bdid:
>> 3944 .long 0,0,0,0,0,0,0,0
>> 3945 #endif
>> 3946 #if defined(CONFIG_Q40)
>> 3947 q40_mem_cptr:
>> 3948 .long 0
>> 3949 L(q40_do_debug):
>> 3950 .long 0
>> 3951 #endif
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