>> 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 **
>> 28 ** This file is subject to the terms and conditions of the GNU General Public
>> 29 ** License. See the file README.legal in the main directory of this archive
>> 30 ** for more details.
>> 31 **
>> 32 */
>> 33
1 /* 34 /*
2 * Copyright (C) 2009 Wind River Systems Inc !! 35 * Linux startup code.
3 * Implemented by fredrik.markstrom@gmail.co !! 36 *
4 * Copyright (C) 2004 Microtronix Datacom Ltd !! 37 * At this point, the boot loader has:
5 * Copyright (C) 2001 Vic Phillips, Microtroni !! 38 * Disabled interrupts
6 * !! 39 * Disabled caches
7 * Based on head.S for Altera's Excalibur deve !! 40 * Put us in supervisor state.
8 * !! 41 *
9 * Based on the following from the Excalibur s !! 42 * The kernel setup code takes the following steps:
10 * NA_MemoryMap.s, NR_JumpToStart.s, NR_S !! 43 * . Raise interrupt level
11 * !! 44 * . Set up initial kernel memory mapping.
12 * This file is subject to the terms and condi !! 45 * . This sets up a mapping of the 4M of memory the kernel is located in.
13 * License. See the file "COPYING" in the main !! 46 * . It also does a mapping of any initial machine specific areas.
14 * for more details. !! 47 * . Enable the MMU
>> 48 * . Enable cache memories
>> 49 * . Jump to kernel startup
>> 50 *
>> 51 * Much of the file restructuring was to accomplish:
>> 52 * 1) Remove register dependency through-out the file.
>> 53 * 2) Increase use of subroutines to perform functions
>> 54 * 3) Increase readability of the code
>> 55 *
>> 56 * Of course, readability is a subjective issue, so it will never be
>> 57 * argued that that goal was accomplished. It was merely a goal.
>> 58 * A key way to help make code more readable is to give good
>> 59 * documentation. So, the first thing you will find is exaustive
>> 60 * write-ups on the structure of the file, and the features of the
>> 61 * functional subroutines.
>> 62 *
>> 63 * General Structure:
>> 64 * ------------------
>> 65 * Without a doubt the single largest chunk of head.S is spent
>> 66 * mapping the kernel and I/O physical space into the logical range
>> 67 * for the kernel.
>> 68 * There are new subroutines and data structures to make MMU
>> 69 * support cleaner and easier to understand.
>> 70 * First, you will find a routine call "mmu_map" which maps
>> 71 * a logical to a physical region for some length given a cache
>> 72 * type on behalf of the caller. This routine makes writing the
>> 73 * actual per-machine specific code very simple.
>> 74 * A central part of the code, but not a subroutine in itself,
>> 75 * is the mmu_init code which is broken down into mapping the kernel
>> 76 * (the same for all machines) and mapping machine-specific I/O
>> 77 * regions.
>> 78 * Also, there will be a description of engaging the MMU and
>> 79 * caches.
>> 80 * You will notice that there is a chunk of code which
>> 81 * can emit the entire MMU mapping of the machine. This is present
>> 82 * only in debug modes and can be very helpful.
>> 83 * Further, there is a new console driver in head.S that is
>> 84 * also only engaged in debug mode. Currently, it's only supported
>> 85 * on the Macintosh class of machines. However, it is hoped that
>> 86 * others will plug-in support for specific machines.
>> 87 *
>> 88 * ######################################################################
>> 89 *
>> 90 * mmu_map
>> 91 * -------
>> 92 * mmu_map was written for two key reasons. First, it was clear
>> 93 * that it was very difficult to read the previous code for mapping
>> 94 * regions of memory. Second, the Macintosh required such extensive
>> 95 * memory allocations that it didn't make sense to propagate the
>> 96 * existing code any further.
>> 97 * mmu_map requires some parameters:
>> 98 *
>> 99 * mmu_map (logical, physical, length, cache_type)
>> 100 *
>> 101 * While this essentially describes the function in the abstract, you'll
>> 102 * find more indepth description of other parameters at the implementation site.
>> 103 *
>> 104 * mmu_get_root_table_entry
>> 105 * ------------------------
>> 106 * mmu_get_ptr_table_entry
>> 107 * -----------------------
>> 108 * mmu_get_page_table_entry
>> 109 * ------------------------
>> 110 *
>> 111 * These routines are used by other mmu routines to get a pointer into
>> 112 * a table, if necessary a new table is allocated. These routines are working
>> 113 * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root
>> 114 * table needs of course only to be allocated once in mmu_get_root_table_entry,
>> 115 * so that here also some mmu specific initialization is done. The second page
>> 116 * at the start of the kernel (the first page is unmapped later) is used for
>> 117 * the kernel_pg_dir. It must be at a position known at link time (as it's used
>> 118 * to initialize the init task struct) and since it needs special cache
>> 119 * settings, it's the easiest to use this page, the rest of the page is used
>> 120 * for further pointer tables.
>> 121 * mmu_get_page_table_entry allocates always a whole page for page tables, this
>> 122 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
>> 123 * to manage page tables in smaller pieces as nearly all mappings have that
>> 124 * size.
>> 125 *
>> 126 * ######################################################################
>> 127 *
>> 128 *
>> 129 * ######################################################################
>> 130 *
>> 131 * mmu_engage
>> 132 * ----------
>> 133 * Thanks to a small helping routine enabling the mmu got quite simple
>> 134 * and there is only one way left. mmu_engage makes a complete a new mapping
>> 135 * that only includes the absolute necessary to be able to jump to the final
>> 136 * postion and to restore the original mapping.
>> 137 * As this code doesn't need a transparent translation register anymore this
>> 138 * means all registers are free to be used by machines that needs them for
>> 139 * other purposes.
>> 140 *
>> 141 * ######################################################################
>> 142 *
>> 143 * mmu_print
>> 144 * ---------
>> 145 * This algorithm will print out the page tables of the system as
>> 146 * appropriate for an 030 or an 040. This is useful for debugging purposes
>> 147 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
>> 148 *
>> 149 * ######################################################################
>> 150 *
>> 151 * console_init
>> 152 * ------------
>> 153 * The console is also able to be turned off. The console in head.S
>> 154 * is specifically for debugging and can be very useful. It is surrounded by
>> 155 * #ifdef CONSOLE/#endif clauses so it doesn't have to ship in known-good
>> 156 * kernels. It's basic algorithm is to determine the size of the screen
>> 157 * (in height/width and bit depth) and then use that information for
>> 158 * displaying an 8x8 font or an 8x16 (widthxheight). I prefer the 8x8 for
>> 159 * debugging so I can see more good data. But it was trivial to add support
>> 160 * for both fonts, so I included it.
>> 161 * Also, the algorithm for plotting pixels is abstracted so that in
>> 162 * theory other platforms could add support for different kinds of frame
>> 163 * buffers. This could be very useful.
>> 164 *
>> 165 * console_put_penguin
>> 166 * -------------------
>> 167 * An important part of any Linux bring up is the penguin and there's
>> 168 * nothing like getting the Penguin on the screen! This algorithm will work
>> 169 * on any machine for which there is a console_plot_pixel.
>> 170 *
>> 171 * console_scroll
>> 172 * --------------
>> 173 * My hope is that the scroll algorithm does the right thing on the
>> 174 * various platforms, but it wouldn't be hard to add the test conditions
>> 175 * and new code if it doesn't.
>> 176 *
>> 177 * console_putc
>> 178 * -------------
>> 179 *
>> 180 * ######################################################################
>> 181 *
>> 182 * Register usage has greatly simplified within head.S. Every subroutine
>> 183 * saves and restores all registers that it modifies (except it returns a
>> 184 * value in there of course). So the only register that needs to be initialized
>> 185 * is the stack pointer.
>> 186 * All other init code and data is now placed in the init section, so it will
>> 187 * be automatically freed at the end of the kernel initialization.
>> 188 *
>> 189 * ######################################################################
>> 190 *
>> 191 * options
>> 192 * -------
>> 193 * There are many options available in a build of this file. I've
>> 194 * taken the time to describe them here to save you the time of searching
>> 195 * for them and trying to understand what they mean.
>> 196 *
>> 197 * CONFIG_xxx: These are the obvious machine configuration defines created
>> 198 * during configuration. These are defined in include/linux/autoconf.h.
>> 199 *
>> 200 * CONSOLE: There is support for head.S console in this file. This
>> 201 * console can talk to a Mac frame buffer, but could easily be extrapolated
>> 202 * to extend it to support other platforms.
>> 203 *
>> 204 * TEST_MMU: This is a test harness for running on any given machine but
>> 205 * getting an MMU dump for another class of machine. The classes of machines
>> 206 * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.)
>> 207 * and any of the models (030, 040, 060, etc.).
>> 208 *
>> 209 * NOTE: TEST_MMU is NOT permanent! It is scheduled to be removed
>> 210 * When head.S boots on Atari, Amiga, Macintosh, and VME
>> 211 * machines. At that point the underlying logic will be
>> 212 * believed to be solid enough to be trusted, and TEST_MMU
>> 213 * can be dropped. Do note that that will clean up the
>> 214 * head.S code significantly as large blocks of #if/#else
>> 215 * clauses can be removed.
>> 216 *
>> 217 * MMU_NOCACHE_KERNEL: On the Macintosh platform there was an inquiry into
>> 218 * determing why devices don't appear to work. A test case was to remove
>> 219 * the cacheability of the kernel bits.
>> 220 *
>> 221 * MMU_PRINT: There is a routine built into head.S that can display the
>> 222 * MMU data structures. It outputs its result through the serial_putc
>> 223 * interface. So where ever that winds up driving data, that's where the
>> 224 * mmu struct will appear. On the Macintosh that's typically the console.
>> 225 *
>> 226 * SERIAL_DEBUG: There are a series of putc() macro statements
>> 227 * scattered through out the code to give progress of status to the
>> 228 * person sitting at the console. This constant determines whether those
>> 229 * are used.
>> 230 *
>> 231 * DEBUG: This is the standard DEBUG flag that can be set for building
>> 232 * the kernel. It has the effect adding additional tests into
>> 233 * the code.
>> 234 *
>> 235 * FONT_6x11:
>> 236 * FONT_8x8:
>> 237 * FONT_8x16:
>> 238 * In theory these could be determined at run time or handed
>> 239 * over by the booter. But, let's be real, it's a fine hard
>> 240 * coded value. (But, you will notice the code is run-time
>> 241 * flexible!) A pointer to the font's struct font_desc
>> 242 * is kept locally in Lconsole_font. It is used to determine
>> 243 * font size information dynamically.
>> 244 *
>> 245 * Atari constants:
>> 246 * USE_PRINTER: Use the printer port for serial debug.
>> 247 * USE_SCC_B: Use the SCC port A (Serial2) for serial debug.
>> 248 * USE_SCC_A: Use the SCC port B (Modem2) for serial debug.
>> 249 * USE_MFP: Use the ST-MFP port (Modem1) for serial debug.
>> 250 *
>> 251 * Macintosh constants:
>> 252 * MAC_SERIAL_DEBUG: Turns on serial debug output for the Macintosh.
>> 253 * MAC_USE_SCC_A: Use the SCC port A (modem) for serial debug.
>> 254 * MAC_USE_SCC_B: Use the SCC port B (printer) for serial debug (default).
15 */ 255 */
16 256
17 #include <linux/init.h> !! 257 #include <linux/config.h>
18 #include <linux/linkage.h> 258 #include <linux/linkage.h>
19 #include <asm/thread_info.h> !! 259 #include <linux/init.h>
20 #include <asm/processor.h> !! 260 #include <asm/bootinfo.h>
21 #include <asm/cache.h> !! 261 #include <asm/setup.h>
>> 262 #include <asm/entry.h>
>> 263 #include <asm/pgtable.h>
22 #include <asm/page.h> 264 #include <asm/page.h>
23 #include <asm/asm-offsets.h> !! 265 #include "m68k_defs.h"
24 #include <asm/asm-macros.h> !! 266
>> 267 #ifdef CONFIG_MAC
>> 268
>> 269 #include <asm/machw.h>
25 270
26 /* 271 /*
27 * ZERO_PAGE is a special page that is used fo !! 272 * Macintosh console support
28 * data and COW. <<
29 */ 273 */
30 .data !! 274
31 .global empty_zero_page !! 275 #define CONSOLE
32 .align 12 <<
33 empty_zero_page: <<
34 .space PAGE_SIZE <<
35 276
36 /* 277 /*
37 * This global variable is used as an extensio !! 278 * Macintosh serial debug support; outputs boot info to the printer
38 * STATUS register to emulate a user/superviso !! 279 * and/or modem serial ports
39 */ 280 */
40 .data !! 281 #undef MAC_SERIAL_DEBUG
41 .align 2 <<
42 .set noat <<
43 282
44 .global _current_thread <<
45 _current_thread: <<
46 .long 0 <<
47 /* 283 /*
48 * Input(s): passed from u-boot !! 284 * Macintosh serial debug port selection; define one or both;
49 * r4 - Optional pointer to a board informat !! 285 * requires MAC_SERIAL_DEBUG to be defined
50 * r5 - Optional pointer to the physical sta <<
51 * disk. <<
52 * r6 - Optional pointer to the physical end <<
53 * disk. <<
54 * r7 - Optional pointer to the physical sta <<
55 * command-line parameters. <<
56 */ 286 */
>> 287 #define MAC_USE_SCC_A /* Macintosh modem serial port */
>> 288 #define MAC_USE_SCC_B /* Macintosh printer serial port */
>> 289
>> 290 #endif /* CONFIG_MAC */
>> 291
>> 292 #undef MMU_PRINT
>> 293 #undef MMU_NOCACHE_KERNEL
>> 294 #define SERIAL_DEBUG
>> 295 #undef DEBUG
57 296
58 /* 297 /*
59 * First executable code - detected and jumped !! 298 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
60 * if the code resides in flash (looks for "Ni !! 299 * The 8x8 font is harder to read but fits more on the screen.
61 * the potential executable image). !! 300 */
>> 301 #define FONT_8x8 /* default */
>> 302 /* #define FONT_8x16 */ /* 2nd choice */
>> 303 /* #define FONT_6x11 */ /* 3rd choice */
>> 304
>> 305 .globl kernel_pg_dir
>> 306 .globl availmem
>> 307 .globl m68k_pgtable_cachemode
>> 308 .globl m68k_supervisor_cachemode
>> 309 #ifdef CONFIG_MVME16x
>> 310 .globl mvme_bdid
>> 311 #endif
>> 312 #ifdef CONFIG_Q40
>> 313 .globl q40_mem_cptr
>> 314 #endif
>> 315 #ifdef CONFIG_HP300
>> 316 .globl hp300_phys_ram_base
>> 317 #endif
>> 318
>> 319 CPUTYPE_040 = 1 /* indicates an 040 */
>> 320 CPUTYPE_060 = 2 /* indicates an 060 */
>> 321 CPUTYPE_0460 = 3 /* if either above are set, this is set */
>> 322 CPUTYPE_020 = 4 /* indicates an 020 */
>> 323
>> 324 /* Translation control register */
>> 325 TC_ENABLE = 0x8000
>> 326 TC_PAGE8K = 0x4000
>> 327 TC_PAGE4K = 0x0000
>> 328
>> 329 /* Transparent translation registers */
>> 330 TTR_ENABLE = 0x8000 /* enable transparent translation */
>> 331 TTR_ANYMODE = 0x4000 /* user and kernel mode access */
>> 332 TTR_KERNELMODE = 0x2000 /* only kernel mode access */
>> 333 TTR_USERMODE = 0x0000 /* only user mode access */
>> 334 TTR_CI = 0x0400 /* inhibit cache */
>> 335 TTR_RW = 0x0200 /* read/write mode */
>> 336 TTR_RWM = 0x0100 /* read/write mask */
>> 337 TTR_FCB2 = 0x0040 /* function code base bit 2 */
>> 338 TTR_FCB1 = 0x0020 /* function code base bit 1 */
>> 339 TTR_FCB0 = 0x0010 /* function code base bit 0 */
>> 340 TTR_FCM2 = 0x0004 /* function code mask bit 2 */
>> 341 TTR_FCM1 = 0x0002 /* function code mask bit 1 */
>> 342 TTR_FCM0 = 0x0001 /* function code mask bit 0 */
>> 343
>> 344 /* Cache Control registers */
>> 345 CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */
>> 346 CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */
>> 347 CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */
>> 348 CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */
>> 349 CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */
>> 350 CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */
>> 351 CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */
>> 352 CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */
>> 353 CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */
>> 354 CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */
>> 355 CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */
>> 356 CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */
>> 357 CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */
>> 358 CC3_CLR_D = 0x00000800 /* clear data cache (68030) */
>> 359 CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */
>> 360 CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */
>> 361 CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */
>> 362 CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */
>> 363 CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */
>> 364 CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */
>> 365 CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */
>> 366 CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */
>> 367
>> 368 /* Miscellaneous definitions */
>> 369 PAGESIZE = 4096
>> 370 PAGESHIFT = 12
>> 371
>> 372 ROOT_TABLE_SIZE = 128
>> 373 PTR_TABLE_SIZE = 128
>> 374 PAGE_TABLE_SIZE = 64
>> 375 ROOT_INDEX_SHIFT = 25
>> 376 PTR_INDEX_SHIFT = 18
>> 377 PAGE_INDEX_SHIFT = 12
>> 378
>> 379 #ifdef DEBUG
>> 380 /* When debugging use readable names for labels */
>> 381 #ifdef __STDC__
>> 382 #define L(name) .head.S.##name
>> 383 #else
>> 384 #define L(name) .head.S./**/name
>> 385 #endif
>> 386 #else
>> 387 #ifdef __STDC__
>> 388 #define L(name) .L##name
>> 389 #else
>> 390 #define L(name) .L/**/name
>> 391 #endif
>> 392 #endif
>> 393
>> 394 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
>> 395 #ifndef __INITDATA
>> 396 #define __INITDATA .data
>> 397 #define __FINIT .previous
>> 398 #endif
>> 399
>> 400 /* Several macros to make the writing of subroutines easier:
>> 401 * - func_start marks the beginning of the routine which setups the frame
>> 402 * register and saves the registers, it also defines another macro
>> 403 * to automatically restore the registers again.
>> 404 * - func_return marks the end of the routine and simply calls the prepared
>> 405 * macro to restore registers and jump back to the caller.
>> 406 * - func_define generates another macro to automatically put arguments
>> 407 * onto the stack call the subroutine and cleanup the stack again.
>> 408 */
>> 409
>> 410 /* Within subroutines these macros can be used to access the arguments
>> 411 * on the stack. With STACK some allocated memory on the stack can be
>> 412 * accessed and ARG0 points to the return address (used by mmu_engage).
62 */ 413 */
63 __HEAD !! 414 #define STACK %a6@(stackstart)
>> 415 #define ARG0 %a6@(4)
>> 416 #define ARG1 %a6@(8)
>> 417 #define ARG2 %a6@(12)
>> 418 #define ARG3 %a6@(16)
>> 419 #define ARG4 %a6@(20)
>> 420
>> 421 .macro func_start name,saveregs,stack=0
>> 422 L(\name):
>> 423 linkw %a6,#-\stack
>> 424 moveml \saveregs,%sp@-
>> 425 .set stackstart,-\stack
>> 426
>> 427 .macro func_return_\name
>> 428 moveml %sp@+,\saveregs
>> 429 unlk %a6
>> 430 rts
>> 431 .endm
>> 432 .endm
>> 433
>> 434 .macro func_return name
>> 435 func_return_\name
>> 436 .endm
>> 437
>> 438 .macro func_call name
>> 439 jbsr L(\name)
>> 440 .endm
>> 441
>> 442 .macro move_stack nr,arg1,arg2,arg3,arg4
>> 443 .if \nr
>> 444 move_stack "(\nr-1)",\arg2,\arg3,\arg4
>> 445 movel \arg1,%sp@-
>> 446 .endif
>> 447 .endm
>> 448
>> 449 .macro func_define name,nr=0
>> 450 .macro \name arg1,arg2,arg3,arg4
>> 451 move_stack \nr,\arg1,\arg2,\arg3,\arg4
>> 452 func_call \name
>> 453 .if \nr
>> 454 lea %sp@(\nr*4),%sp
>> 455 .endif
>> 456 .endm
>> 457 .endm
>> 458
>> 459 func_define mmu_map,4
>> 460 func_define mmu_map_tt,4
>> 461 func_define mmu_fixup_page_mmu_cache,1
>> 462 func_define mmu_temp_map,2
>> 463 func_define mmu_engage
>> 464 func_define mmu_get_root_table_entry,1
>> 465 func_define mmu_get_ptr_table_entry,2
>> 466 func_define mmu_get_page_table_entry,2
>> 467 func_define mmu_print
>> 468 func_define get_new_page
>> 469 #ifdef CONFIG_HP300
>> 470 func_define set_leds
>> 471 #endif
>> 472
>> 473 .macro mmu_map_eq arg1,arg2,arg3
>> 474 mmu_map \arg1,\arg1,\arg2,\arg3
>> 475 .endm
>> 476
>> 477 .macro get_bi_record record
>> 478 pea \record
>> 479 func_call get_bi_record
>> 480 addql #4,%sp
>> 481 .endm
>> 482
>> 483 func_define serial_putc,1
>> 484 func_define console_putc,1
>> 485
>> 486 .macro putc ch
>> 487 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 488 pea \ch
>> 489 #endif
>> 490 #ifdef CONSOLE
>> 491 func_call console_putc
>> 492 #endif
>> 493 #ifdef SERIAL_DEBUG
>> 494 func_call serial_putc
>> 495 #endif
>> 496 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 497 addql #4,%sp
>> 498 #endif
>> 499 .endm
>> 500
>> 501 .macro dputc ch
>> 502 #ifdef DEBUG
>> 503 putc \ch
>> 504 #endif
>> 505 .endm
>> 506
>> 507 func_define putn,1
>> 508
>> 509 .macro dputn nr
>> 510 #ifdef DEBUG
>> 511 putn \nr
>> 512 #endif
>> 513 .endm
>> 514
>> 515 .macro puts string
>> 516 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
>> 517 __INITDATA
>> 518 .Lstr\@:
>> 519 .string "\string"
>> 520 __FINIT
>> 521 pea %pc@(.Lstr\@)
>> 522 func_call puts
>> 523 addql #4,%sp
>> 524 #endif
>> 525 .endm
>> 526
>> 527 .macro dputs string
>> 528 #ifdef DEBUG
>> 529 puts "\string"
>> 530 #endif
>> 531 .endm
>> 532
>> 533 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
>> 534 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
>> 535 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
>> 536 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
>> 537 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
>> 538 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
>> 539 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
>> 540 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
>> 541 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
>> 542 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
>> 543 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
>> 544 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
>> 545 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
>> 546
>> 547 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
>> 548 jeq 42f; \
>> 549 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
>> 550 jne lab ;\
>> 551 42:\
>> 552
>> 553 #define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
>> 554 #define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
>> 555 #define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
>> 556 #define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
>> 557 #define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
>> 558 #define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
>> 559 #define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
>> 560
>> 561 /* On the HP300 we use the on-board LEDs for debug output before
>> 562 the console is running. Writing a 1 bit turns the corresponding LED
>> 563 _off_ - on the 340 bit 7 is towards the back panel of the machine. */
>> 564 .macro leds mask
>> 565 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 566 hasnt_leds(.Lled\@)
>> 567 pea \mask
>> 568 func_call set_leds
>> 569 addql #4,%sp
>> 570 .Lled\@:
>> 571 #endif
>> 572 .endm
>> 573
>> 574 .text
>> 575 ENTRY(_stext)
>> 576 /*
>> 577 * Version numbers of the bootinfo interface
>> 578 * The area from _stext to _start will later be used as kernel pointer table
>> 579 */
>> 580 bras 1f /* Jump over bootinfo version numbers */
>> 581
>> 582 .long BOOTINFOV_MAGIC
>> 583 .long MACH_AMIGA, AMIGA_BOOTI_VERSION
>> 584 .long MACH_ATARI, ATARI_BOOTI_VERSION
>> 585 .long MACH_MVME147, MVME147_BOOTI_VERSION
>> 586 .long MACH_MVME16x, MVME16x_BOOTI_VERSION
>> 587 .long MACH_BVME6000, BVME6000_BOOTI_VERSION
>> 588 .long MACH_MAC, MAC_BOOTI_VERSION
>> 589 .long MACH_Q40, Q40_BOOTI_VERSION
>> 590 .long 0
>> 591 1: jra __start
>> 592
>> 593 .equ kernel_pg_dir,_stext
>> 594
>> 595 .equ .,_stext+PAGESIZE
>> 596
64 ENTRY(_start) 597 ENTRY(_start)
65 wrctl status, r0 /* Dis !! 598 jra __start
>> 599 __INIT
>> 600 ENTRY(__start)
>> 601
>> 602 #ifdef CONFIG_HP300
>> 603 /* This is a hack. The HP NetBSD bootloader loads us at an arbitrary
>> 604 address (apparently 0xff002000 in practice) which is not good if we need
>> 605 to be able to map this to VA 0x1000. We could do it with pagetables but
>> 606 a better solution seems to be to relocate the kernel in physical memory
>> 607 before we start.
>> 608
>> 609 So, we copy the entire kernel image (code+data+bss) down to the 16MB
>> 610 boundary that marks the start of RAM. This is slightly tricky because
>> 611 we must not overwrite the copying code itself. :-) */
>> 612
>> 613 /* 15/5/98. The start address of physical RAM changes depending on how much
>> 614 RAM is present. This is actually a blessing in disguise as it provides
>> 615 a way for us to work out the RAM size rather than hardwiring it. */
>> 616
>> 617 lea %pc@(_start),%a0
>> 618 movel %a0,%d6
>> 619 and #0xffff0000, %d6
>> 620 lea %pc@(hp300_phys_ram_base),%a0
>> 621 movel %d6, %a0@
>> 622 movel %pc@(L(custom)),%a3
>> 623 moveb #0xfe,%d7
>> 624 moveb %d7,%a3@(0x1ffff)
>> 625 lea %pc@(Lcopystart),%a0
>> 626 lea %pc@(Lcopyend),%a1
>> 627 movel %d6,%a2 /* Start of physical RAM */
>> 628 1: moveb %a0@+,%d0
>> 629 moveb %d0,%a2@+
>> 630 cmpl %a0,%a1
>> 631 jbne 1b
>> 632 movel %d6,%a2
>> 633 moveb #0xfd,%d7
>> 634 moveb %d7,%a3@(0x1ffff)
>> 635 lea %pc@(_stext),%a0
>> 636 lea %pc@(_end),%a1
>> 637 jmp %a2@
>> 638
>> 639 Lcopystart:
>> 640 moveb #0xf7,%d7
>> 641 moveb %d7,%a3@(0x1ffff)
>> 642 movel %d6,%a2 /* Start of kernel */
>> 643 add #0x1000,%a2
>> 644 1: moveb %a0@+,%d0
>> 645 moveb %d0,%a2@+
>> 646 cmpl %a0,%a1
>> 647 jbne 1b
>> 648 moveb #0,%d7
>> 649 moveb %d7,%a3@(0x1ffff)
>> 650 movel %d6,%a0
>> 651 addl #Lstart1,%a0
>> 652 jmp %a0@
>> 653 Lcopyend:
>> 654
>> 655 Lstart1:
>> 656 moveb #0x3f,%d7
>> 657 moveb %d7,%a3@(0x1ffff)
>> 658 #endif /* CONFIG_HP300 */
>> 659
>> 660 /*
>> 661 * Setup initial stack pointer
>> 662 */
>> 663 lea %pc@(_stext),%sp
>> 664
>> 665 /*
>> 666 * Record the CPU and machine type.
>> 667 */
>> 668
>> 669 #ifndef CONFIG_HP300
>> 670 get_bi_record BI_MACHTYPE
>> 671 lea %pc@(m68k_machtype),%a1
>> 672 movel %a0@,%a1@
>> 673
>> 674 get_bi_record BI_FPUTYPE
>> 675 lea %pc@(m68k_fputype),%a1
>> 676 movel %a0@,%a1@
>> 677
>> 678 get_bi_record BI_MMUTYPE
>> 679 lea %pc@(m68k_mmutype),%a1
>> 680 movel %a0@,%a1@
>> 681
>> 682 get_bi_record BI_CPUTYPE
>> 683 lea %pc@(m68k_cputype),%a1
>> 684 movel %a0@,%a1@
>> 685 #else /* CONFIG_HP300 */
>> 686 /* FIXME HP300 doesn't use bootinfo yet */
>> 687 movel #MACH_HP300,%d4
>> 688 lea %pc@(m68k_machtype),%a0
>> 689 movel %d4,%a0@
>> 690 movel #FPU_68881,%d0
>> 691 lea %pc@(m68k_fputype),%a0
>> 692 movel %d0,%a0@
>> 693 movel #MMU_68030,%d0
>> 694 lea %pc@(m68k_mmutype),%a0
>> 695 movel %d0,%a0@
>> 696 movel #CPU_68030,%d0
>> 697 lea %pc@(m68k_cputype),%a0
>> 698 movel %d0,%a0@
>> 699
>> 700 leds(0x1)
>> 701 #endif /* CONFIG_HP300 */
>> 702
>> 703 #ifdef CONFIG_MAC
>> 704 /*
>> 705 * For Macintosh, we need to determine the display parameters early (at least
>> 706 * while debugging it).
>> 707 */
>> 708
>> 709 is_not_mac(L(test_notmac))
>> 710
>> 711 get_bi_record BI_MAC_VADDR
>> 712 lea %pc@(L(mac_videobase)),%a1
>> 713 movel %a0@,%a1@
>> 714
>> 715 get_bi_record BI_MAC_VDEPTH
>> 716 lea %pc@(L(mac_videodepth)),%a1
>> 717 movel %a0@,%a1@
>> 718
>> 719 get_bi_record BI_MAC_VDIM
>> 720 lea %pc@(L(mac_dimensions)),%a1
>> 721 movel %a0@,%a1@
>> 722
>> 723 get_bi_record BI_MAC_VROW
>> 724 lea %pc@(L(mac_rowbytes)),%a1
>> 725 movel %a0@,%a1@
>> 726
>> 727 #ifdef MAC_SERIAL_DEBUG
>> 728 get_bi_record BI_MAC_SCCBASE
>> 729 lea %pc@(L(mac_sccbase)),%a1
>> 730 movel %a0@,%a1@
>> 731 #endif /* MAC_SERIAL_DEBUG */
>> 732
>> 733 #if 0
>> 734 /*
>> 735 * Clear the screen
>> 736 */
>> 737 lea %pc@(L(mac_videobase)),%a0
>> 738 movel %a0@,%a1
>> 739 lea %pc@(L(mac_dimensions)),%a0
>> 740 movel %a0@,%d1
>> 741 swap %d1 /* #rows is high bytes */
>> 742 andl #0xFFFF,%d1 /* rows */
>> 743 subl #10,%d1
>> 744 lea %pc@(L(mac_rowbytes)),%a0
>> 745 loopy2:
>> 746 movel %a0@,%d0
>> 747 subql #1,%d0
>> 748 loopx2:
>> 749 moveb #0x55, %a1@+
>> 750 dbra %d0,loopx2
>> 751 dbra %d1,loopy2
>> 752 #endif
>> 753
>> 754 L(test_notmac):
>> 755 #endif /* CONFIG_MAC */
>> 756
>> 757
>> 758 /*
>> 759 * There are ultimately two pieces of information we want for all kinds of
>> 760 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter
>> 761 * and is converted here from a booter type definition to a separate bit
>> 762 * number which allows for the standard is_0x0 macro tests.
>> 763 */
>> 764 movel %pc@(m68k_cputype),%d0
>> 765 /*
>> 766 * Assume it's an 030
>> 767 */
>> 768 clrl %d1
>> 769
>> 770 /*
>> 771 * Test the BootInfo cputype for 060
>> 772 */
>> 773 btst #CPUB_68060,%d0
>> 774 jeq 1f
>> 775 bset #CPUTYPE_060,%d1
>> 776 bset #CPUTYPE_0460,%d1
>> 777 jra 3f
>> 778 1:
>> 779 /*
>> 780 * Test the BootInfo cputype for 040
>> 781 */
>> 782 btst #CPUB_68040,%d0
>> 783 jeq 2f
>> 784 bset #CPUTYPE_040,%d1
>> 785 bset #CPUTYPE_0460,%d1
>> 786 jra 3f
>> 787 2:
>> 788 /*
>> 789 * Test the BootInfo cputype for 020
>> 790 */
>> 791 btst #CPUB_68020,%d0
>> 792 jeq 3f
>> 793 bset #CPUTYPE_020,%d1
>> 794 jra 3f
>> 795 3:
>> 796 /*
>> 797 * Record the cpu type
>> 798 */
>> 799 lea %pc@(L(cputype)),%a0
>> 800 movel %d1,%a0@
>> 801
>> 802 /*
>> 803 * NOTE:
>> 804 *
>> 805 * Now the macros are valid:
>> 806 * is_040_or_060
>> 807 * is_not_040_or_060
>> 808 * is_040
>> 809 * is_060
>> 810 * is_not_060
>> 811 */
>> 812
>> 813 /*
>> 814 * Determine the cache mode for pages holding MMU tables
>> 815 * and for supervisor mode, unused for '020 and '030
>> 816 */
>> 817 clrl %d0
>> 818 clrl %d1
>> 819
>> 820 is_not_040_or_060(L(save_cachetype))
>> 821
>> 822 /*
>> 823 * '040 or '060
>> 824 * d1 := cacheable write-through
>> 825 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
>> 826 * but we have been using write-through since at least 2.0.29 so I
>> 827 * guess it is OK.
>> 828 */
>> 829 #ifdef CONFIG_060_WRITETHROUGH
>> 830 /*
>> 831 * If this is a 68060 board using drivers with cache coherency
>> 832 * problems, then supervisor memory accesses need to be write-through
>> 833 * also; otherwise, we want copyback.
>> 834 */
>> 835
>> 836 is_not_060(1f)
>> 837 movel #_PAGE_CACHE040W,%d0
>> 838 jra L(save_cachetype)
>> 839 #endif /* CONFIG_060_WRITETHROUGH */
>> 840 1:
>> 841 movew #_PAGE_CACHE040,%d0
>> 842
>> 843 movel #_PAGE_CACHE040W,%d1
>> 844
>> 845 L(save_cachetype):
>> 846 /* Save cache mode for supervisor mode and page tables
>> 847 */
>> 848 lea %pc@(m68k_supervisor_cachemode),%a0
>> 849 movel %d0,%a0@
>> 850 lea %pc@(m68k_pgtable_cachemode),%a0
>> 851 movel %d1,%a0@
>> 852
>> 853 /*
>> 854 * raise interrupt level
>> 855 */
>> 856 movew #0x2700,%sr
>> 857
>> 858 /*
>> 859 If running on an Atari, determine the I/O base of the
>> 860 serial port and test if we are running on a Medusa or Hades.
>> 861 This test is necessary here, because on the Hades the serial
>> 862 port is only accessible in the high I/O memory area.
>> 863
>> 864 The test whether it is a Medusa is done by writing to the byte at
>> 865 phys. 0x0. This should result in a bus error on all other machines.
>> 866
>> 867 ...should, but doesn't. The Afterburner040 for the Falcon has the
>> 868 same behaviour (0x0..0x7 are no ROM shadow). So we have to do
>> 869 another test to distinguish Medusa and AB040. This is a
>> 870 read attempt for 0x00ff82fe phys. that should bus error on a Falcon
>> 871 (+AB040), but is in the range where the Medusa always asserts DTACK.
>> 872
>> 873 The test for the Hades is done by reading address 0xb0000000. This
>> 874 should give a bus error on the Medusa.
>> 875 */
>> 876
>> 877 #ifdef CONFIG_ATARI
>> 878 is_not_atari(L(notypetest))
>> 879
>> 880 /* get special machine type (Medusa/Hades/AB40) */
>> 881 moveq #0,%d3 /* default if tag doesn't exist */
>> 882 get_bi_record BI_ATARI_MCH_TYPE
>> 883 tstl %d0
>> 884 jbmi 1f
>> 885 movel %a0@,%d3
>> 886 lea %pc@(atari_mch_type),%a0
>> 887 movel %d3,%a0@
>> 888 1:
>> 889 /* On the Hades, the iobase must be set up before opening the
>> 890 * serial port. There are no I/O regs at 0x00ffxxxx at all. */
>> 891 moveq #0,%d0
>> 892 cmpl #ATARI_MACH_HADES,%d3
>> 893 jbne 1f
>> 894 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */
>> 895 1: lea %pc@(L(iobase)),%a0
>> 896 movel %d0,%a0@
>> 897
>> 898 L(notypetest):
>> 899 #endif
>> 900
>> 901 #ifdef CONFIG_VME
>> 902 is_mvme147(L(getvmetype))
>> 903 is_bvme6000(L(getvmetype))
>> 904 is_not_mvme16x(L(gvtdone))
>> 905
>> 906 /* See if the loader has specified the BI_VME_TYPE tag. Recent
>> 907 * versions of VMELILO and TFTPLILO do this. We have to do this
>> 908 * early so we know how to handle console output. If the tag
>> 909 * doesn't exist then we use the Bug for output on MVME16x.
>> 910 */
>> 911 L(getvmetype):
>> 912 get_bi_record BI_VME_TYPE
>> 913 tstl %d0
>> 914 jbmi 1f
>> 915 movel %a0@,%d3
>> 916 lea %pc@(vme_brdtype),%a0
>> 917 movel %d3,%a0@
>> 918 1:
>> 919 #ifdef CONFIG_MVME16x
>> 920 is_not_mvme16x(L(gvtdone))
>> 921
>> 922 /* Need to get the BRD_ID info to differentiate between 162, 167,
>> 923 * etc. This is available as a BI_VME_BRDINFO tag with later
>> 924 * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
>> 925 */
>> 926 get_bi_record BI_VME_BRDINFO
>> 927 tstl %d0
>> 928 jpl 1f
>> 929
>> 930 /* Get pointer to board ID data from Bug */
>> 931 movel %d2,%sp@-
>> 932 trap #15
>> 933 .word 0x70 /* trap 0x70 - .BRD_ID */
>> 934 movel %sp@+,%a0
>> 935 1:
>> 936 lea %pc@(mvme_bdid),%a1
>> 937 /* Structure is 32 bytes long */
>> 938 movel %a0@+,%a1@+
>> 939 movel %a0@+,%a1@+
>> 940 movel %a0@+,%a1@+
>> 941 movel %a0@+,%a1@+
>> 942 movel %a0@+,%a1@+
>> 943 movel %a0@+,%a1@+
>> 944 movel %a0@+,%a1@+
>> 945 movel %a0@+,%a1@+
>> 946 #endif
>> 947
>> 948 L(gvtdone):
>> 949
>> 950 #endif
>> 951
>> 952 /*
>> 953 * Initialize serial port
>> 954 */
>> 955 jbsr L(serial_init)
>> 956
>> 957 /*
>> 958 * Initialize console
>> 959 */
>> 960 #ifdef CONFIG_MAC
>> 961 is_not_mac(L(nocon))
>> 962 #ifdef CONSOLE
>> 963 jbsr L(console_init)
>> 964 #ifdef CONSOLE_PENGUIN
>> 965 jbsr L(console_put_penguin)
>> 966 #endif /* CONSOLE_PENGUIN */
>> 967 jbsr L(console_put_stats)
>> 968 #endif /* CONSOLE */
>> 969 L(nocon):
>> 970 #endif /* CONFIG_MAC */
>> 971
>> 972
>> 973 putc '\n'
>> 974 putc 'A'
>> 975 #ifdef CONFIG_HP300
>> 976 leds(0x2)
>> 977 #endif /* CONFIG_HP300 */
>> 978 dputn %pc@(L(cputype))
>> 979 dputn %pc@(m68k_supervisor_cachemode)
>> 980 dputn %pc@(m68k_pgtable_cachemode)
>> 981 dputc '\n'
>> 982
>> 983 /*
>> 984 * Save physical start address of kernel
>> 985 */
>> 986 lea %pc@(L(phys_kernel_start)),%a0
>> 987 lea %pc@(_stext),%a1
>> 988 subl #_stext,%a1
>> 989 addl #PAGE_OFFSET,%a1
>> 990 movel %a1,%a0@
>> 991
>> 992 putc 'B'
>> 993
>> 994 leds 0x4
>> 995
>> 996 /*
>> 997 * mmu_init
>> 998 *
>> 999 * This block of code does what's necessary to map in the various kinds
>> 1000 * of machines for execution of Linux.
>> 1001 * First map the first 4 MB of kernel code & data
>> 1002 */
>> 1003
>> 1004 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\
>> 1005 %pc@(m68k_supervisor_cachemode)
>> 1006
>> 1007 putc 'C'
>> 1008
>> 1009 #ifdef CONFIG_AMIGA
>> 1010
>> 1011 L(mmu_init_amiga):
>> 1012
>> 1013 is_not_amiga(L(mmu_init_not_amiga))
>> 1014 /*
>> 1015 * mmu_init_amiga
>> 1016 */
>> 1017
>> 1018 putc 'D'
>> 1019
>> 1020 is_not_040_or_060(1f)
>> 1021
>> 1022 /*
>> 1023 * 040: Map the 16Meg range physical 0x0 upto logical 0x8000.0000
>> 1024 */
>> 1025 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 1026 /*
>> 1027 * Map the Zorro III I/O space with transparent translation
>> 1028 * for frame buffer memory etc.
>> 1029 */
>> 1030 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1031
>> 1032 jbra L(mmu_init_done)
>> 1033
>> 1034 1:
>> 1035 /*
>> 1036 * 030: Map the 32Meg range physical 0x0 upto logical 0x8000.0000
>> 1037 */
>> 1038 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1039 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
>> 1040
>> 1041 jbra L(mmu_init_done)
>> 1042
>> 1043 L(mmu_init_not_amiga):
>> 1044 #endif
>> 1045
>> 1046 #ifdef CONFIG_ATARI
>> 1047
>> 1048 L(mmu_init_atari):
>> 1049
>> 1050 is_not_atari(L(mmu_init_not_atari))
>> 1051
>> 1052 putc 'E'
>> 1053
>> 1054 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
>> 1055 the last 16 MB of virtual address space to the first 16 MB (i.e.
>> 1056 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
>> 1057 needed. I/O ranges are marked non-cachable.
>> 1058
>> 1059 For the Medusa it is better to map the I/O region transparently
>> 1060 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
>> 1061 accessible only in the high area.
>> 1062
>> 1063 On the Hades all I/O registers are only accessible in the high
>> 1064 area.
>> 1065 */
>> 1066
>> 1067 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
>> 1068 moveq #0,%d0
>> 1069 movel %pc@(atari_mch_type),%d3
>> 1070 cmpl #ATARI_MACH_MEDUSA,%d3
>> 1071 jbeq 2f
>> 1072 cmpl #ATARI_MACH_HADES,%d3
>> 1073 jbne 1f
>> 1074 2: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
>> 1075 1: movel %d0,%d3
>> 1076
>> 1077 is_040_or_060(L(spata68040))
>> 1078
>> 1079 /* Map everything non-cacheable, though not all parts really
>> 1080 * need to disable caches (crucial only for 0xff8000..0xffffff
>> 1081 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
>> 1082 * isn't really used, except for sometimes peeking into the
>> 1083 * ROMs (mirror at phys. 0x0), so caching isn't necessary for
>> 1084 * this. */
>> 1085 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
>> 1086
>> 1087 jbra L(mmu_init_done)
>> 1088
>> 1089 L(spata68040):
>> 1090
>> 1091 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
>> 1092
>> 1093 jbra L(mmu_init_done)
>> 1094
>> 1095 L(mmu_init_not_atari):
>> 1096 #endif
>> 1097
>> 1098 #ifdef CONFIG_Q40
>> 1099 is_not_q40(L(notq40))
>> 1100 /*
>> 1101 * add transparent mapping for 0xff00 0000 - 0xffff ffff
>> 1102 * non-cached serialized etc..
>> 1103 * this includes master chip, DAC, RTC and ISA ports
>> 1104 * 0xfe000000-0xfeffffff is for screen and ROM
>> 1105 */
>> 1106
>> 1107 putc 'Q'
>> 1108
>> 1109 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
>> 1110 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1111
>> 1112 jbra L(mmu_init_done)
>> 1113
>> 1114 L(notq40):
>> 1115 #endif
>> 1116
>> 1117 #ifdef CONFIG_HP300
>> 1118 is_not_hp300(L(nothp300))
>> 1119
>> 1120 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
>> 1121 by mapping 32MB from 0xf0xxxxxx -> 0x00xxxxxx) using an 030 early
>> 1122 termination page descriptor. The ROM mapping is needed because the LEDs
>> 1123 are mapped there too. */
>> 1124
>> 1125 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1126
>> 1127 L(nothp300):
>> 1128
>> 1129 #endif
>> 1130
>> 1131 #ifdef CONFIG_MVME147
>> 1132
>> 1133 is_not_mvme147(L(not147))
>> 1134
>> 1135 /*
>> 1136 * On MVME147 we have already created kernel page tables for
>> 1137 * 4MB of RAM at address 0, so now need to do a transparent
>> 1138 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1139 * so we can access on-board i/o areas.
>> 1140 */
>> 1141
>> 1142 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
>> 1143
>> 1144 jbra L(mmu_init_done)
>> 1145
>> 1146 L(not147):
>> 1147 #endif /* CONFIG_MVME147 */
>> 1148
>> 1149 #ifdef CONFIG_MVME16x
>> 1150
>> 1151 is_not_mvme16x(L(not16x))
>> 1152
>> 1153 /*
>> 1154 * On MVME16x we have already created kernel page tables for
>> 1155 * 4MB of RAM at address 0, so now need to do a transparent
>> 1156 * mapping of the top of memory space. Make it 0.5GByte for now.
>> 1157 * Supervisor only access, so transparent mapping doesn't
>> 1158 * clash with User code virtual address space.
>> 1159 * this covers IO devices, PROM and SRAM. The PROM and SRAM
>> 1160 * mapping is needed to allow 167Bug to run.
>> 1161 * IO is in the range 0xfff00000 to 0xfffeffff.
>> 1162 * PROM is 0xff800000->0xffbfffff and SRAM is
>> 1163 * 0xffe00000->0xffe1ffff.
>> 1164 */
>> 1165
>> 1166 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1167
>> 1168 jbra L(mmu_init_done)
>> 1169
>> 1170 L(not16x):
>> 1171 #endif /* CONFIG_MVME162 | CONFIG_MVME167 */
>> 1172
>> 1173 #ifdef CONFIG_BVME6000
>> 1174
>> 1175 is_not_bvme6000(L(not6000))
>> 1176
>> 1177 /*
>> 1178 * On BVME6000 we have already created kernel page tables for
>> 1179 * 4MB of RAM at address 0, so now need to do a transparent
>> 1180 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1181 * so we can access on-board i/o areas.
>> 1182 * Supervisor only access, so transparent mapping doesn't
>> 1183 * clash with User code virtual address space.
>> 1184 */
>> 1185
>> 1186 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1187
>> 1188 jbra L(mmu_init_done)
>> 1189
>> 1190 L(not6000):
>> 1191 #endif /* CONFIG_BVME6000 */
>> 1192
>> 1193 /*
>> 1194 * mmu_init_mac
>> 1195 *
>> 1196 * The Macintosh mappings are less clear.
>> 1197 *
>> 1198 * Even as of this writing, it is unclear how the
>> 1199 * Macintosh mappings will be done. However, as
>> 1200 * the first author of this code I'm proposing the
>> 1201 * following model:
>> 1202 *
>> 1203 * Map the kernel (that's already done),
>> 1204 * Map the I/O (on most machines that's the
>> 1205 * 0x5000.0000 ... 0x5300.0000 range,
>> 1206 * Map the video frame buffer using as few pages
>> 1207 * as absolutely (this requirement mostly stems from
>> 1208 * the fact that when the frame buffer is at
>> 1209 * 0x0000.0000 then we know there is valid RAM just
>> 1210 * above the screen that we don't want to waste!).
>> 1211 *
>> 1212 * By the way, if the frame buffer is at 0x0000.0000
>> 1213 * then the Macintosh is known as an RBV based Mac.
>> 1214 *
>> 1215 * By the way 2, the code currently maps in a bunch of
>> 1216 * regions. But I'd like to cut that out. (And move most
>> 1217 * of the mappings up into the kernel proper ... or only
>> 1218 * map what's necessary.)
>> 1219 */
>> 1220
>> 1221 #ifdef CONFIG_MAC
>> 1222
>> 1223 L(mmu_init_mac):
>> 1224
>> 1225 is_not_mac(L(mmu_init_not_mac))
>> 1226
>> 1227 putc 'F'
>> 1228
>> 1229 lea %pc@(L(mac_videobase)),%a0
>> 1230 lea %pc@(L(console_video_virtual)),%a1
>> 1231 movel %a0@,%a1@
>> 1232
>> 1233 is_not_040_or_060(1f)
>> 1234
>> 1235 moveq #_PAGE_NOCACHE_S,%d3
>> 1236 jbra 2f
>> 1237 1:
>> 1238 moveq #_PAGE_NOCACHE030,%d3
>> 1239 2:
>> 1240 /*
>> 1241 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
>> 1242 * we simply map the 4MB that contains the videomem
>> 1243 */
>> 1244
>> 1245 movel #VIDEOMEMMASK,%d0
>> 1246 andl L(mac_videobase),%d0
>> 1247
>> 1248 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
>> 1249 /* The ROM starts at 4000 0000 */
>> 1250 mmu_map_eq #0x40000000,#0x02000000,%d3
>> 1251 /* IO devices */
>> 1252 mmu_map_eq #0x50000000,#0x03000000,%d3
>> 1253 /* NuBus slot space */
>> 1254 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3
>> 1255
>> 1256 jbra L(mmu_init_done)
>> 1257
>> 1258 L(mmu_init_not_mac):
>> 1259 #endif
>> 1260
>> 1261 #ifdef CONFIG_SUN3X
>> 1262 is_not_sun3x(L(notsun3x))
>> 1263
>> 1264 /* oh, the pain.. We're gonna want the prom code after
>> 1265 * starting the MMU, so we copy the mappings, translating
>> 1266 * from 8k -> 4k pages as we go.
>> 1267 */
>> 1268
>> 1269 /* copy maps from 0xfee00000 to 0xff000000 */
>> 1270 movel #0xfee00000, %d0
>> 1271 moveq #ROOT_INDEX_SHIFT, %d1
>> 1272 lsrl %d1,%d0
>> 1273 mmu_get_root_table_entry %d0
>> 1274
>> 1275 movel #0xfee00000, %d0
>> 1276 moveq #PTR_INDEX_SHIFT, %d1
>> 1277 lsrl %d1,%d0
>> 1278 andl #PTR_TABLE_SIZE-1, %d0
>> 1279 mmu_get_ptr_table_entry %a0,%d0
>> 1280
>> 1281 movel #0xfee00000, %d0
>> 1282 moveq #PAGE_INDEX_SHIFT, %d1
>> 1283 lsrl %d1,%d0
>> 1284 andl #PAGE_TABLE_SIZE-1, %d0
>> 1285 mmu_get_page_table_entry %a0,%d0
>> 1286
>> 1287 /* this is where the prom page table lives */
>> 1288 movel 0xfefe00d4, %a1
>> 1289 movel %a1@, %a1
>> 1290
>> 1291 movel #((0x200000 >> 13)-1), %d1
>> 1292
>> 1293 1:
>> 1294 movel %a1@+, %d3
>> 1295 movel %d3,%a0@+
>> 1296 addl #0x1000,%d3
>> 1297 movel %d3,%a0@+
>> 1298
>> 1299 dbra %d1,1b
>> 1300
>> 1301 /* setup tt1 for I/O */
>> 1302 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
>> 1303 jbra L(mmu_init_done)
>> 1304
>> 1305 L(notsun3x):
>> 1306 #endif
>> 1307
>> 1308 #ifdef CONFIG_APOLLO
>> 1309 is_not_apollo(L(notapollo))
>> 1310
>> 1311 putc 'P'
>> 1312 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1313
>> 1314 L(notapollo):
>> 1315 jbra L(mmu_init_done)
>> 1316 #endif
>> 1317
>> 1318 L(mmu_init_done):
>> 1319
>> 1320 putc 'G'
>> 1321 leds 0x8
>> 1322
>> 1323 /*
>> 1324 * mmu_fixup
>> 1325 *
>> 1326 * On the 040 class machines, all pages that are used for the
>> 1327 * mmu have to be fixed up. According to Motorola, pages holding mmu
>> 1328 * tables should be non-cacheable on a '040 and write-through on a
>> 1329 * '060. But analysis of the reasons for this, and practical
>> 1330 * experience, showed that write-through also works on a '040.
>> 1331 *
>> 1332 * Allocated memory so far goes from kernel_end to memory_start that
>> 1333 * is used for all kind of tables, for that the cache attributes
>> 1334 * are now fixed.
>> 1335 */
>> 1336 L(mmu_fixup):
>> 1337
>> 1338 is_not_040_or_060(L(mmu_fixup_done))
>> 1339
>> 1340 #ifdef MMU_NOCACHE_KERNEL
>> 1341 jbra L(mmu_fixup_done)
>> 1342 #endif
>> 1343
>> 1344 /* first fix the page at the start of the kernel, that
>> 1345 * contains also kernel_pg_dir.
>> 1346 */
>> 1347 movel %pc@(L(phys_kernel_start)),%d0
>> 1348 subl #PAGE_OFFSET,%d0
>> 1349 lea %pc@(_stext),%a0
>> 1350 subl %d0,%a0
>> 1351 mmu_fixup_page_mmu_cache %a0
>> 1352
>> 1353 movel %pc@(L(kernel_end)),%a0
>> 1354 subl %d0,%a0
>> 1355 movel %pc@(L(memory_start)),%a1
>> 1356 subl %d0,%a1
>> 1357 bra 2f
>> 1358 1:
>> 1359 mmu_fixup_page_mmu_cache %a0
>> 1360 addw #PAGESIZE,%a0
>> 1361 2:
>> 1362 cmpl %a0,%a1
>> 1363 jgt 1b
>> 1364
>> 1365 L(mmu_fixup_done):
>> 1366
>> 1367 #ifdef MMU_PRINT
>> 1368 mmu_print
>> 1369 #endif
>> 1370
>> 1371 /*
>> 1372 * mmu_engage
>> 1373 *
>> 1374 * This chunk of code performs the gruesome task of engaging the MMU.
>> 1375 * The reason its gruesome is because when the MMU becomes engaged it
>> 1376 * maps logical addresses to physical addresses. The Program Counter
>> 1377 * register is then passed through the MMU before the next instruction
>> 1378 * is fetched (the instruction following the engage MMU instruction).
>> 1379 * This may mean one of two things:
>> 1380 * 1. The Program Counter falls within the logical address space of
>> 1381 * the kernel of which there are two sub-possibilities:
>> 1382 * A. The PC maps to the correct instruction (logical PC == physical
>> 1383 * code location), or
>> 1384 * B. The PC does not map through and the processor will read some
>> 1385 * data (or instruction) which is not the logically next instr.
>> 1386 * As you can imagine, A is good and B is bad.
>> 1387 * Alternatively,
>> 1388 * 2. The Program Counter does not map through the MMU. The processor
>> 1389 * will take a Bus Error.
>> 1390 * Clearly, 2 is bad.
>> 1391 * It doesn't take a wiz kid to figure you want 1.A.
>> 1392 * This code creates that possibility.
>> 1393 * There are two possible 1.A. states (we now ignore the other above states):
>> 1394 * A. The kernel is located at physical memory addressed the same as
>> 1395 * the logical memory for the kernel, i.e., 0x01000.
>> 1396 * B. The kernel is located some where else. e.g., 0x0400.0000
>> 1397 *
>> 1398 * Under some conditions the Macintosh can look like A or B.
>> 1399 * [A friend and I once noted that Apple hardware engineers should be
>> 1400 * wacked twice each day: once when they show up at work (as in, Whack!,
>> 1401 * "This is for the screwy hardware we know you're going to design today."),
>> 1402 * and also at the end of the day (as in, Whack! "I don't know what
>> 1403 * you designed today, but I'm sure it wasn't good."). -- rst]
>> 1404 *
>> 1405 * This code works on the following premise:
>> 1406 * If the kernel start (%d5) is within the first 16 Meg of RAM,
>> 1407 * then create a mapping for the kernel at logical 0x8000.0000 to
>> 1408 * the physical location of the pc. And, create a transparent
>> 1409 * translation register for the first 16 Meg. Then, after the MMU
>> 1410 * is engaged, the PC can be moved up into the 0x8000.0000 range
>> 1411 * and then the transparent translation can be turned off and then
>> 1412 * the PC can jump to the correct logical location and it will be
>> 1413 * home (finally). This is essentially the code that the Amiga used
>> 1414 * to use. Now, it's generalized for all processors. Which means
>> 1415 * that a fresh (but temporary) mapping has to be created. The mapping
>> 1416 * is made in page 0 (an as of yet unused location -- except for the
>> 1417 * stack!). This temporary mapping will only require 1 pointer table
>> 1418 * and a single page table (it can map 256K).
>> 1419 *
>> 1420 * OK, alternatively, imagine that the Program Counter is not within
>> 1421 * the first 16 Meg. Then, just use Transparent Translation registers
>> 1422 * to do the right thing.
>> 1423 *
>> 1424 * Last, if _start is already at 0x01000, then there's nothing special
>> 1425 * to do (in other words, in a degenerate case of the first case above,
>> 1426 * do nothing).
>> 1427 *
>> 1428 * Let's do it.
>> 1429 *
>> 1430 *
>> 1431 */
>> 1432
>> 1433 putc 'H'
>> 1434
>> 1435 mmu_engage
>> 1436
>> 1437 /*
>> 1438 * After this point no new memory is allocated and
>> 1439 * the start of available memory is stored in availmem.
>> 1440 * (The bootmem allocator requires now the physicall address.)
>> 1441 */
>> 1442
>> 1443 movel L(memory_start),availmem
>> 1444
>> 1445 #ifdef CONFIG_AMIGA
>> 1446 is_not_amiga(1f)
>> 1447 /* fixup the Amiga custom register location before printing */
>> 1448 clrl L(custom)
>> 1449 1:
>> 1450 #endif
>> 1451
>> 1452 #ifdef CONFIG_ATARI
>> 1453 is_not_atari(1f)
>> 1454 /* fixup the Atari iobase register location before printing */
>> 1455 movel #0xff000000,L(iobase)
>> 1456 1:
>> 1457 #endif
>> 1458
>> 1459 #ifdef CONFIG_MAC
>> 1460 is_not_mac(1f)
>> 1461 movel #~VIDEOMEMMASK,%d0
>> 1462 andl L(mac_videobase),%d0
>> 1463 addl #VIDEOMEMBASE,%d0
>> 1464 movel %d0,L(mac_videobase)
>> 1465 #ifdef MAC_SERIAL_DEBUG
>> 1466 orl #0x50000000,L(mac_sccbase)
>> 1467 #endif
>> 1468 1:
>> 1469 #endif
>> 1470
>> 1471 #ifdef CONFIG_HP300
>> 1472 is_not_hp300(1f)
>> 1473 /*
>> 1474 * Fix up the custom register to point to the new location of the LEDs.
>> 1475 */
>> 1476 movel #0xf0000000,L(custom)
>> 1477
>> 1478 /*
>> 1479 * Energise the FPU and caches.
>> 1480 */
>> 1481 movel #0x60,0xf05f400c
>> 1482 1:
>> 1483 #endif
>> 1484
>> 1485 #ifdef CONFIG_SUN3X
>> 1486 is_not_sun3x(1f)
>> 1487
>> 1488 /* enable copro */
>> 1489 oriw #0x4000,0x61000000
>> 1490 1:
>> 1491 #endif
>> 1492
>> 1493 #ifdef CONFIG_APOLLO
>> 1494 is_not_apollo(1f)
>> 1495
>> 1496 /*
>> 1497 * Fix up the iobase before printing
>> 1498 */
>> 1499 movel #0x80000000,L(iobase)
>> 1500 1:
>> 1501 #endif
>> 1502
>> 1503 putc 'I'
>> 1504 leds 0x10
>> 1505
>> 1506 /*
>> 1507 * Enable caches
>> 1508 */
>> 1509
>> 1510 is_not_040_or_060(L(cache_not_680460))
>> 1511
>> 1512 L(cache680460):
>> 1513 .chip 68040
>> 1514 nop
>> 1515 cpusha %bc
>> 1516 nop
>> 1517
>> 1518 is_060(L(cache68060))
>> 1519
>> 1520 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0
>> 1521 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1522 movec %d0,%cacr
>> 1523 jra L(cache_done)
>> 1524
>> 1525 L(cache68060):
>> 1526 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
>> 1527 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1528 movec %d0,%cacr
>> 1529 /* enable superscalar dispatch in PCR */
>> 1530 moveq #1,%d0
>> 1531 .chip 68060
>> 1532 movec %d0,%pcr
>> 1533
>> 1534 jbra L(cache_done)
>> 1535 L(cache_not_680460):
>> 1536 L(cache68030):
>> 1537 .chip 68030
>> 1538 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
>> 1539 movec %d0,%cacr
>> 1540
>> 1541 jra L(cache_done)
>> 1542 .chip 68k
>> 1543 L(cache_done):
>> 1544
>> 1545 putc 'J'
>> 1546
>> 1547 /*
>> 1548 * Setup initial stack pointer
>> 1549 */
>> 1550 lea init_task,%curptr
>> 1551 lea init_thread_union+THREAD_SIZE,%sp
>> 1552
>> 1553 putc 'K'
>> 1554
>> 1555 subl %a6,%a6 /* clear a6 for gdb */
>> 1556
>> 1557 /*
>> 1558 * The new 64bit printf support requires an early exception initialization.
>> 1559 */
>> 1560 jbsr base_trap_init
>> 1561
>> 1562 /* jump to the kernel start */
>> 1563
>> 1564 putc '\n'
>> 1565 leds 0x55
>> 1566
>> 1567 jbsr start_kernel
>> 1568
>> 1569 /*
>> 1570 * Find a tag record in the bootinfo structure
>> 1571 * The bootinfo structure is located right after the kernel bss
>> 1572 * Returns: d0: size (-1 if not found)
>> 1573 * a0: data pointer (end-of-records if not found)
>> 1574 */
>> 1575 func_start get_bi_record,%d1
>> 1576
>> 1577 movel ARG1,%d0
>> 1578 lea %pc@(_end),%a0
>> 1579 #ifndef CONFIG_HP300
>> 1580 1: tstw %a0@(BIR_TAG)
>> 1581 jeq 3f
>> 1582 cmpw %a0@(BIR_TAG),%d0
>> 1583 jeq 2f
>> 1584 addw %a0@(BIR_SIZE),%a0
>> 1585 jra 1b
>> 1586 2: moveq #0,%d0
>> 1587 movew %a0@(BIR_SIZE),%d0
>> 1588 lea %a0@(BIR_DATA),%a0
>> 1589 jra 4f
>> 1590 3: moveq #-1,%d0
>> 1591 lea %a0@(BIR_SIZE),%a0
>> 1592 4:
>> 1593 #endif /* CONFIG_HP300 */
>> 1594 func_return get_bi_record
>> 1595
>> 1596
>> 1597 /*
>> 1598 * MMU Initialization Begins Here
>> 1599 *
>> 1600 * The structure of the MMU tables on the 68k machines
>> 1601 * is thus:
>> 1602 * Root Table
>> 1603 * Logical addresses are translated through
>> 1604 * a hierarchical translation mechanism where the high-order
>> 1605 * seven bits of the logical address (LA) are used as an
>> 1606 * index into the "root table." Each entry in the root
>> 1607 * table has a bit which specifies if it's a valid pointer to a
>> 1608 * pointer table. Each entry defines a 32KMeg range of memory.
>> 1609 * If an entry is invalid then that logical range of 32M is
>> 1610 * invalid and references to that range of memory (when the MMU
>> 1611 * is enabled) will fault. If the entry is valid, then it does
>> 1612 * one of two things. On 040/060 class machines, it points to
>> 1613 * a pointer table which then describes more finely the memory
>> 1614 * within that 32M range. On 020/030 class machines, a technique
>> 1615 * called "early terminating descriptors" are used. This technique
>> 1616 * allows an entire 32Meg to be described by a single entry in the
>> 1617 * root table. Thus, this entry in the root table, contains the
>> 1618 * physical address of the memory or I/O at the logical address
>> 1619 * which the entry represents and it also contains the necessary
>> 1620 * cache bits for this region.
>> 1621 *
>> 1622 * Pointer Tables
>> 1623 * Per the Root Table, there will be one or more
>> 1624 * pointer tables. Each pointer table defines a 32M range.
>> 1625 * Not all of the 32M range need be defined. Again, the next
>> 1626 * seven bits of the logical address are used an index into
>> 1627 * the pointer table to point to page tables (if the pointer
>> 1628 * is valid). There will undoubtedly be more than one
>> 1629 * pointer table for the kernel because each pointer table
>> 1630 * defines a range of only 32M. Valid pointer table entries
>> 1631 * point to page tables, or are early terminating entries
>> 1632 * themselves.
>> 1633 *
>> 1634 * Page Tables
>> 1635 * Per the Pointer Tables, each page table entry points
>> 1636 * to the physical page in memory that supports the logical
>> 1637 * address that translates to the particular index.
>> 1638 *
>> 1639 * In short, the Logical Address gets translated as follows:
>> 1640 * bits 31..26 - index into the Root Table
>> 1641 * bits 25..18 - index into the Pointer Table
>> 1642 * bits 17..12 - index into the Page Table
>> 1643 * bits 11..0 - offset into a particular 4K page
>> 1644 *
>> 1645 * The algorithms which follows do one thing: they abstract
>> 1646 * the MMU hardware. For example, there are three kinds of
>> 1647 * cache settings that are relevant. Either, memory is
>> 1648 * being mapped in which case it is either Kernel Code (or
>> 1649 * the RamDisk) or it is MMU data. On the 030, the MMU data
>> 1650 * option also describes the kernel. Or, I/O is being mapped
>> 1651 * in which case it has its own kind of cache bits. There
>> 1652 * are constants which abstract these notions from the code that
>> 1653 * actually makes the call to map some range of memory.
>> 1654 *
>> 1655 *
>> 1656 *
>> 1657 */
>> 1658
>> 1659 #ifdef MMU_PRINT
>> 1660 /*
>> 1661 * mmu_print
>> 1662 *
>> 1663 * This algorithm will print out the current MMU mappings.
>> 1664 *
>> 1665 * Input:
>> 1666 * %a5 points to the root table. Everything else is calculated
>> 1667 * from this.
>> 1668 */
>> 1669
>> 1670 #define mmu_next_valid 0
>> 1671 #define mmu_start_logical 4
>> 1672 #define mmu_next_logical 8
>> 1673 #define mmu_start_physical 12
>> 1674 #define mmu_next_physical 16
>> 1675
>> 1676 #define MMU_PRINT_INVALID -1
>> 1677 #define MMU_PRINT_VALID 1
>> 1678 #define MMU_PRINT_UNINITED 0
>> 1679
>> 1680 #define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2:
>> 1681
>> 1682 func_start mmu_print,%a0-%a6/%d0-%d7
>> 1683
>> 1684 movel %pc@(L(kernel_pgdir_ptr)),%a5
>> 1685 lea %pc@(L(mmu_print_data)),%a0
>> 1686 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
>> 1687
>> 1688 is_not_040_or_060(mmu_030_print)
>> 1689
>> 1690 mmu_040_print:
>> 1691 puts "\nMMU040\n"
>> 1692 puts "rp:"
>> 1693 putn %a5
>> 1694 putc '\n'
>> 1695 #if 0
>> 1696 /*
>> 1697 * The following #if/#endif block is a tight algorithm for dumping the 040
>> 1698 * MMU Map in gory detail. It really isn't that practical unless the
>> 1699 * MMU Map algorithm appears to go awry and you need to debug it at the
>> 1700 * entry per entry level.
>> 1701 */
>> 1702 movel #ROOT_TABLE_SIZE,%d5
>> 1703 #if 0
>> 1704 movel %a5@+,%d7 | Burn an entry to skip the kernel mappings,
>> 1705 subql #1,%d5 | they (might) work
>> 1706 #endif
>> 1707 1: tstl %d5
>> 1708 jbeq mmu_print_done
>> 1709 subq #1,%d5
>> 1710 movel %a5@+,%d7
>> 1711 btst #1,%d7
>> 1712 jbeq 1b
>> 1713
>> 1714 2: putn %d7
>> 1715 andil #0xFFFFFE00,%d7
>> 1716 movel %d7,%a4
>> 1717 movel #PTR_TABLE_SIZE,%d4
>> 1718 putc ' '
>> 1719 3: tstl %d4
>> 1720 jbeq 11f
>> 1721 subq #1,%d4
>> 1722 movel %a4@+,%d7
>> 1723 btst #1,%d7
>> 1724 jbeq 3b
>> 1725
>> 1726 4: putn %d7
>> 1727 andil #0xFFFFFF00,%d7
>> 1728 movel %d7,%a3
>> 1729 movel #PAGE_TABLE_SIZE,%d3
>> 1730 5: movel #8,%d2
>> 1731 6: tstl %d3
>> 1732 jbeq 31f
>> 1733 subq #1,%d3
>> 1734 movel %a3@+,%d6
>> 1735 btst #0,%d6
>> 1736 jbeq 6b
>> 1737 7: tstl %d2
>> 1738 jbeq 8f
>> 1739 subq #1,%d2
>> 1740 putc ' '
>> 1741 jbra 91f
>> 1742 8: putc '\n'
>> 1743 movel #8+1+8+1+1,%d2
>> 1744 9: putc ' '
>> 1745 dbra %d2,9b
>> 1746 movel #7,%d2
>> 1747 91: putn %d6
>> 1748 jbra 6b
>> 1749
>> 1750 31: putc '\n'
>> 1751 movel #8+1,%d2
>> 1752 32: putc ' '
>> 1753 dbra %d2,32b
>> 1754 jbra 3b
>> 1755
>> 1756 11: putc '\n'
>> 1757 jbra 1b
>> 1758 #endif /* MMU 040 Dumping code that's gory and detailed */
>> 1759
>> 1760 lea %pc@(kernel_pg_dir),%a5
>> 1761 movel %a5,%a0 /* a0 has the address of the root table ptr */
>> 1762 movel #0x00000000,%a4 /* logical address */
>> 1763 moveql #0,%d0
>> 1764 40:
>> 1765 /* Increment the logical address and preserve in d5 */
>> 1766 movel %a4,%d5
>> 1767 addil #PAGESIZE<<13,%d5
>> 1768 movel %a0@+,%d6
>> 1769 btst #1,%d6
>> 1770 jbne 41f
>> 1771 jbsr mmu_print_tuple_invalidate
>> 1772 jbra 48f
>> 1773 41:
>> 1774 movel #0,%d1
>> 1775 andil #0xfffffe00,%d6
>> 1776 movel %d6,%a1
>> 1777 42:
>> 1778 movel %a4,%d5
>> 1779 addil #PAGESIZE<<6,%d5
>> 1780 movel %a1@+,%d6
>> 1781 btst #1,%d6
>> 1782 jbne 43f
>> 1783 jbsr mmu_print_tuple_invalidate
>> 1784 jbra 47f
>> 1785 43:
>> 1786 movel #0,%d2
>> 1787 andil #0xffffff00,%d6
>> 1788 movel %d6,%a2
>> 1789 44:
>> 1790 movel %a4,%d5
>> 1791 addil #PAGESIZE,%d5
>> 1792 movel %a2@+,%d6
>> 1793 btst #0,%d6
>> 1794 jbne 45f
>> 1795 jbsr mmu_print_tuple_invalidate
>> 1796 jbra 46f
>> 1797 45:
>> 1798 moveml %d0-%d1,%sp@-
>> 1799 movel %a4,%d0
>> 1800 movel %d6,%d1
>> 1801 andil #0xfffff4e0,%d1
>> 1802 lea %pc@(mmu_040_print_flags),%a6
>> 1803 jbsr mmu_print_tuple
>> 1804 moveml %sp@+,%d0-%d1
>> 1805 46:
>> 1806 movel %d5,%a4
>> 1807 addq #1,%d2
>> 1808 cmpib #64,%d2
>> 1809 jbne 44b
>> 1810 47:
>> 1811 movel %d5,%a4
>> 1812 addq #1,%d1
>> 1813 cmpib #128,%d1
>> 1814 jbne 42b
>> 1815 48:
>> 1816 movel %d5,%a4 /* move to the next logical address */
>> 1817 addq #1,%d0
>> 1818 cmpib #128,%d0
>> 1819 jbne 40b
>> 1820
>> 1821 .chip 68040
>> 1822 movec %dtt1,%d0
>> 1823 movel %d0,%d1
>> 1824 andiw #0x8000,%d1 /* is it valid ? */
>> 1825 jbeq 1f /* No, bail out */
>> 1826
>> 1827 movel %d0,%d1
>> 1828 andil #0xff000000,%d1 /* Get the address */
>> 1829 putn %d1
>> 1830 puts "=="
>> 1831 putn %d1
>> 1832
>> 1833 movel %d0,%d6
>> 1834 jbsr mmu_040_print_flags_tt
>> 1835 1:
>> 1836 movec %dtt0,%d0
>> 1837 movel %d0,%d1
>> 1838 andiw #0x8000,%d1 /* is it valid ? */
>> 1839 jbeq 1f /* No, bail out */
>> 1840
>> 1841 movel %d0,%d1
>> 1842 andil #0xff000000,%d1 /* Get the address */
>> 1843 putn %d1
>> 1844 puts "=="
>> 1845 putn %d1
>> 1846
>> 1847 movel %d0,%d6
>> 1848 jbsr mmu_040_print_flags_tt
>> 1849 1:
>> 1850 .chip 68k
>> 1851
>> 1852 jbra mmu_print_done
>> 1853
>> 1854 mmu_040_print_flags:
>> 1855 btstl #10,%d6
>> 1856 putZc(' ','G') /* global bit */
>> 1857 btstl #7,%d6
>> 1858 putZc(' ','S') /* supervisor bit */
>> 1859 mmu_040_print_flags_tt:
>> 1860 btstl #6,%d6
>> 1861 jbne 3f
>> 1862 putc 'C'
>> 1863 btstl #5,%d6
>> 1864 putZc('w','c') /* write through or copy-back */
>> 1865 jbra 4f
>> 1866 3:
>> 1867 putc 'N'
>> 1868 btstl #5,%d6
>> 1869 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */
>> 1870 4:
>> 1871 rts
>> 1872
>> 1873 mmu_030_print_flags:
>> 1874 btstl #6,%d6
>> 1875 putZc('C','I') /* write through or copy-back */
>> 1876 rts
>> 1877
>> 1878 mmu_030_print:
>> 1879 puts "\nMMU030\n"
>> 1880 puts "\nrp:"
>> 1881 putn %a5
>> 1882 putc '\n'
>> 1883 movel %a5,%d0
>> 1884 andil #0xfffffff0,%d0
>> 1885 movel %d0,%a0
>> 1886 movel #0x00000000,%a4 /* logical address */
>> 1887 movel #0,%d0
>> 1888 30:
>> 1889 movel %a4,%d5
>> 1890 addil #PAGESIZE<<13,%d5
>> 1891 movel %a0@+,%d6
>> 1892 btst #1,%d6 /* is it a ptr? */
>> 1893 jbne 31f /* yes */
>> 1894 btst #0,%d6 /* is it early terminating? */
>> 1895 jbeq 1f /* no */
>> 1896 jbsr mmu_030_print_helper
>> 1897 jbra 38f
>> 1898 1:
>> 1899 jbsr mmu_print_tuple_invalidate
>> 1900 jbra 38f
>> 1901 31:
>> 1902 movel #0,%d1
>> 1903 andil #0xfffffff0,%d6
>> 1904 movel %d6,%a1
>> 1905 32:
>> 1906 movel %a4,%d5
>> 1907 addil #PAGESIZE<<6,%d5
>> 1908 movel %a1@+,%d6
>> 1909 btst #1,%d6
>> 1910 jbne 33f
>> 1911 btst #0,%d6
>> 1912 jbeq 1f /* no */
>> 1913 jbsr mmu_030_print_helper
>> 1914 jbra 37f
>> 1915 1:
>> 1916 jbsr mmu_print_tuple_invalidate
>> 1917 jbra 37f
>> 1918 33:
>> 1919 movel #0,%d2
>> 1920 andil #0xfffffff0,%d6
>> 1921 movel %d6,%a2
>> 1922 34:
>> 1923 movel %a4,%d5
>> 1924 addil #PAGESIZE,%d5
>> 1925 movel %a2@+,%d6
>> 1926 btst #0,%d6
>> 1927 jbne 35f
>> 1928 jbsr mmu_print_tuple_invalidate
>> 1929 jbra 36f
>> 1930 35:
>> 1931 jbsr mmu_030_print_helper
>> 1932 36:
>> 1933 movel %d5,%a4
>> 1934 addq #1,%d2
>> 1935 cmpib #64,%d2
>> 1936 jbne 34b
>> 1937 37:
>> 1938 movel %d5,%a4
>> 1939 addq #1,%d1
>> 1940 cmpib #128,%d1
>> 1941 jbne 32b
>> 1942 38:
>> 1943 movel %d5,%a4 /* move to the next logical address */
>> 1944 addq #1,%d0
>> 1945 cmpib #128,%d0
>> 1946 jbne 30b
>> 1947
>> 1948 mmu_print_done:
>> 1949 puts "\n\n"
>> 1950
>> 1951 func_return mmu_print
>> 1952
>> 1953
>> 1954 mmu_030_print_helper:
>> 1955 moveml %d0-%d1,%sp@-
>> 1956 movel %a4,%d0
>> 1957 movel %d6,%d1
>> 1958 lea %pc@(mmu_030_print_flags),%a6
>> 1959 jbsr mmu_print_tuple
>> 1960 moveml %sp@+,%d0-%d1
>> 1961 rts
>> 1962
>> 1963 mmu_print_tuple_invalidate:
>> 1964 moveml %a0/%d7,%sp@-
>> 1965
>> 1966 lea %pc@(L(mmu_print_data)),%a0
>> 1967 tstl %a0@(mmu_next_valid)
>> 1968 jbmi mmu_print_tuple_invalidate_exit
>> 1969
>> 1970 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
>> 1971
>> 1972 putn %a4
>> 1973
>> 1974 puts "##\n"
>> 1975
>> 1976 mmu_print_tuple_invalidate_exit:
>> 1977 moveml %sp@+,%a0/%d7
>> 1978 rts
>> 1979
>> 1980
>> 1981 mmu_print_tuple:
>> 1982 moveml %d0-%d7/%a0,%sp@-
>> 1983
>> 1984 lea %pc@(L(mmu_print_data)),%a0
>> 1985
>> 1986 tstl %a0@(mmu_next_valid)
>> 1987 jble mmu_print_tuple_print
>> 1988
>> 1989 cmpl %a0@(mmu_next_physical),%d1
>> 1990 jbeq mmu_print_tuple_increment
>> 1991
>> 1992 mmu_print_tuple_print:
>> 1993 putn %d0
>> 1994 puts "->"
>> 1995 putn %d1
>> 1996
>> 1997 movel %d1,%d6
>> 1998 jbsr %a6@
>> 1999
>> 2000 mmu_print_tuple_record:
>> 2001 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid)
>> 2002
>> 2003 movel %d1,%a0@(mmu_next_physical)
>> 2004
>> 2005 mmu_print_tuple_increment:
>> 2006 movel %d5,%d7
>> 2007 subl %a4,%d7
>> 2008 addl %d7,%a0@(mmu_next_physical)
>> 2009
>> 2010 mmu_print_tuple_exit:
>> 2011 moveml %sp@+,%d0-%d7/%a0
>> 2012 rts
>> 2013
>> 2014 mmu_print_machine_cpu_types:
>> 2015 puts "machine: "
>> 2016
>> 2017 is_not_amiga(1f)
>> 2018 puts "amiga"
>> 2019 jbra 9f
>> 2020 1:
>> 2021 is_not_atari(2f)
>> 2022 puts "atari"
>> 2023 jbra 9f
>> 2024 2:
>> 2025 is_not_mac(3f)
>> 2026 puts "macintosh"
>> 2027 jbra 9f
>> 2028 3: puts "unknown"
>> 2029 9: putc '\n'
>> 2030
>> 2031 puts "cputype: 0"
>> 2032 is_not_060(1f)
>> 2033 putc '6'
>> 2034 jbra 9f
>> 2035 1:
>> 2036 is_not_040_or_060(2f)
>> 2037 putc '4'
>> 2038 jbra 9f
>> 2039 2: putc '3'
>> 2040 9: putc '0'
>> 2041 putc '\n'
66 2042
67 /* Initialize all cache lines within t !! 2043 rts
68 movia r1, NIOS2_ICACHE_SIZE !! 2044 #endif /* MMU_PRINT */
69 movui r2, NIOS2_ICACHE_LINE_SIZE <<
70 <<
71 icache_init: <<
72 initi r1 <<
73 sub r1, r1, r2 <<
74 bgt r1, r0, icache_init <<
75 br 1f <<
76 <<
77 /* <<
78 * This is the default location for th <<
79 * to our handler <<
80 */ <<
81 ENTRY(exception_handler_hook) <<
82 movia r24, inthandler <<
83 jmp r24 <<
84 <<
85 ENTRY(fast_handler) <<
86 nextpc et <<
87 helper: <<
88 stw r3, r3save - helper(et) <<
89 <<
90 rdctl r3 , pteaddr <<
91 srli r3, r3, 12 <<
92 slli r3, r3, 2 <<
93 movia et, pgd_current <<
94 <<
95 ldw et, 0(et) <<
96 add r3, et, r3 <<
97 ldw et, 0(r3) <<
98 <<
99 rdctl r3, pteaddr <<
100 andi r3, r3, 0xfff <<
101 add et, r3, et <<
102 ldw et, 0(et) <<
103 wrctl tlbacc, et <<
104 nextpc et <<
105 helper2: <<
106 ldw r3, r3save - helper2(et) <<
107 subi ea, ea, 4 <<
108 eret <<
109 r3save: <<
110 .word 0x0 <<
111 ENTRY(fast_handler_end) <<
112 <<
113 1: <<
114 /* <<
115 * After the instruction cache is init <<
116 * also be initialized. <<
117 */ <<
118 movia r1, NIOS2_DCACHE_SIZE <<
119 movui r2, NIOS2_DCACHE_LINE_SIZE <<
120 <<
121 dcache_init: <<
122 initd 0(r1) <<
123 sub r1, r1, r2 <<
124 bgt r1, r0, dcache_init <<
125 <<
126 nextpc r1 /* Fin <<
127 chkadr: <<
128 movia r2, chkadr <<
129 beq r1, r2,finish_move /* We <<
130 addi r1, r1,(_start - chkadr) <<
131 movia r2, _start /* Des <<
132 movia r3, __bss_start /* End <<
133 <<
134 loop_move: /* r1: <<
135 ldw r8, 0(r1) /* loa <<
136 stw r8, 0(r2) /* sto <<
137 flushd 0(r2) /* Flu <<
138 addi r1, r1, 4 /* inc <<
139 addi r2, r2, 4 /* inc <<
140 blt r2, r3, loop_move <<
141 <<
142 movia r1, finish_move /* VMA <<
143 jmp r1 /* jmp <<
144 <<
145 finish_move: <<
146 <<
147 /* Mask off all possible interrupts */ <<
148 wrctl ienable, r0 <<
149 <<
150 /* Clear .bss */ <<
151 movia r2, __bss_start <<
152 movia r1, __bss_stop <<
153 1: <<
154 stb r0, 0(r2) <<
155 addi r2, r2, 1 <<
156 bne r1, r2, 1b <<
157 <<
158 movia r1, init_thread_union /* set <<
159 addi sp, r1, THREAD_SIZE <<
160 movia r2, _current_thread /* Rem <<
161 stw r1, 0(r2) <<
162 <<
163 movia r1, nios2_boot_init /* sav <<
164 callr r1 <<
165 <<
166 movia r1, start_kernel /* cal <<
167 callr r1 <<
168 2045
169 /* If we return from start_kernel, bre !! 2046 /*
170 * buggered we are. !! 2047 * mmu_map_tt
>> 2048 *
>> 2049 * This is a specific function which works on all 680x0 machines.
>> 2050 * On 030, 040 & 060 it will attempt to use Transparent Translation
>> 2051 * registers (tt1).
>> 2052 * On 020 it will call the standard mmu_map which will use early
>> 2053 * terminating descriptors.
>> 2054 */
>> 2055 func_start mmu_map_tt,%d0/%d1/%a0,4
>> 2056
>> 2057 dputs "mmu_map_tt:"
>> 2058 dputn ARG1
>> 2059 dputn ARG2
>> 2060 dputn ARG3
>> 2061 dputn ARG4
>> 2062 dputc '\n'
>> 2063
>> 2064 is_020(L(do_map))
>> 2065
>> 2066 /* Extract the highest bit set
>> 2067 */
>> 2068 bfffo ARG3{#0,#32},%d1
>> 2069 cmpw #8,%d1
>> 2070 jcc L(do_map)
>> 2071
>> 2072 /* And get the mask
>> 2073 */
>> 2074 moveq #-1,%d0
>> 2075 lsrl %d1,%d0
>> 2076 lsrl #1,%d0
>> 2077
>> 2078 /* Mask the address
>> 2079 */
>> 2080 movel %d0,%d1
>> 2081 notl %d1
>> 2082 andl ARG2,%d1
>> 2083
>> 2084 /* Generate the upper 16bit of the tt register
>> 2085 */
>> 2086 lsrl #8,%d0
>> 2087 orl %d0,%d1
>> 2088 clrw %d1
>> 2089
>> 2090 is_040_or_060(L(mmu_map_tt_040))
>> 2091
>> 2092 /* set 030 specific bits (read/write access for supervisor mode
>> 2093 * (highest function code set, lower two bits masked))
>> 2094 */
>> 2095 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
>> 2096 movel ARG4,%d0
>> 2097 btst #6,%d0
>> 2098 jeq 1f
>> 2099 orw #TTR_CI,%d1
>> 2100
>> 2101 1: lea STACK,%a0
>> 2102 dputn %d1
>> 2103 movel %d1,%a0@
>> 2104 .chip 68030
>> 2105 tstl ARG1
>> 2106 jne 1f
>> 2107 pmove %a0@,%tt0
>> 2108 jra 2f
>> 2109 1: pmove %a0@,%tt1
>> 2110 2: .chip 68k
>> 2111 jra L(mmu_map_tt_done)
>> 2112
>> 2113 /* set 040 specific bits
>> 2114 */
>> 2115 L(mmu_map_tt_040):
>> 2116 orw #TTR_ENABLE+TTR_KERNELMODE,%d1
>> 2117 orl ARG4,%d1
>> 2118 dputn %d1
>> 2119
>> 2120 .chip 68040
>> 2121 tstl ARG1
>> 2122 jne 1f
>> 2123 movec %d1,%itt0
>> 2124 movec %d1,%dtt0
>> 2125 jra 2f
>> 2126 1: movec %d1,%itt1
>> 2127 movec %d1,%dtt1
>> 2128 2: .chip 68k
>> 2129
>> 2130 jra L(mmu_map_tt_done)
>> 2131
>> 2132 L(do_map):
>> 2133 mmu_map_eq ARG2,ARG3,ARG4
>> 2134
>> 2135 L(mmu_map_tt_done):
>> 2136
>> 2137 func_return mmu_map_tt
>> 2138
>> 2139 /*
>> 2140 * mmu_map
>> 2141 *
>> 2142 * This routine will map a range of memory using a pointer
>> 2143 * table and allocating the pages on the fly from the kernel.
>> 2144 * The pointer table does not have to be already linked into
>> 2145 * the root table, this routine will do that if necessary.
>> 2146 *
>> 2147 * NOTE
>> 2148 * This routine will assert failure and use the serial_putc
>> 2149 * routines in the case of a run-time error. For example,
>> 2150 * if the address is already mapped.
>> 2151 *
>> 2152 * NOTE-2
>> 2153 * This routine will use early terminating descriptors
>> 2154 * where possible for the 68020+68851 and 68030 type
>> 2155 * processors.
>> 2156 */
>> 2157 func_start mmu_map,%d0-%d4/%a0-%a4
>> 2158
>> 2159 dputs "\nmmu_map:"
>> 2160 dputn ARG1
>> 2161 dputn ARG2
>> 2162 dputn ARG3
>> 2163 dputn ARG4
>> 2164 dputc '\n'
>> 2165
>> 2166 /* Get logical address and round it down to 256KB
>> 2167 */
>> 2168 movel ARG1,%d0
>> 2169 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2170 movel %d0,%a3
>> 2171
>> 2172 /* Get the end address
171 */ 2173 */
172 break !! 2174 movel ARG1,%a4
>> 2175 addl ARG3,%a4
>> 2176 subql #1,%a4
173 2177
174 /* End of startup code */ !! 2178 /* Get physical address and round it down to 256KB
175 .set at !! 2179 */
>> 2180 movel ARG2,%d0
>> 2181 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2182 movel %d0,%a2
>> 2183
>> 2184 /* Add page attributes to the physical address
>> 2185 */
>> 2186 movel ARG4,%d0
>> 2187 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2188 addw %d0,%a2
>> 2189
>> 2190 dputn %a2
>> 2191 dputn %a3
>> 2192 dputn %a4
>> 2193
>> 2194 is_not_040_or_060(L(mmu_map_030))
>> 2195
>> 2196 addw #_PAGE_GLOBAL040,%a2
>> 2197 /*
>> 2198 * MMU 040 & 060 Support
>> 2199 *
>> 2200 * The MMU usage for the 040 and 060 is different enough from
>> 2201 * the 030 and 68851 that there is separate code. This comment
>> 2202 * block describes the data structures and algorithms built by
>> 2203 * this code.
>> 2204 *
>> 2205 * The 040 does not support early terminating descriptors, as
>> 2206 * the 030 does. Therefore, a third level of table is needed
>> 2207 * for the 040, and that would be the page table. In Linux,
>> 2208 * page tables are allocated directly from the memory above the
>> 2209 * kernel.
>> 2210 *
>> 2211 */
>> 2212
>> 2213 L(mmu_map_040):
>> 2214 /* Calculate the offset into the root table
>> 2215 */
>> 2216 movel %a3,%d0
>> 2217 moveq #ROOT_INDEX_SHIFT,%d1
>> 2218 lsrl %d1,%d0
>> 2219 mmu_get_root_table_entry %d0
>> 2220
>> 2221 /* Calculate the offset into the pointer table
>> 2222 */
>> 2223 movel %a3,%d0
>> 2224 moveq #PTR_INDEX_SHIFT,%d1
>> 2225 lsrl %d1,%d0
>> 2226 andl #PTR_TABLE_SIZE-1,%d0
>> 2227 mmu_get_ptr_table_entry %a0,%d0
>> 2228
>> 2229 /* Calculate the offset into the page table
>> 2230 */
>> 2231 movel %a3,%d0
>> 2232 moveq #PAGE_INDEX_SHIFT,%d1
>> 2233 lsrl %d1,%d0
>> 2234 andl #PAGE_TABLE_SIZE-1,%d0
>> 2235 mmu_get_page_table_entry %a0,%d0
>> 2236
>> 2237 /* The page table entry must not no be busy
>> 2238 */
>> 2239 tstl %a0@
>> 2240 jne L(mmu_map_error)
>> 2241
>> 2242 /* Do the mapping and advance the pointers
>> 2243 */
>> 2244 movel %a2,%a0@
>> 2245 2:
>> 2246 addw #PAGESIZE,%a2
>> 2247 addw #PAGESIZE,%a3
>> 2248
>> 2249 /* Ready with mapping?
>> 2250 */
>> 2251 lea %a3@(-1),%a0
>> 2252 cmpl %a0,%a4
>> 2253 jhi L(mmu_map_040)
>> 2254 jra L(mmu_map_done)
>> 2255
>> 2256 L(mmu_map_030):
>> 2257 /* Calculate the offset into the root table
>> 2258 */
>> 2259 movel %a3,%d0
>> 2260 moveq #ROOT_INDEX_SHIFT,%d1
>> 2261 lsrl %d1,%d0
>> 2262 mmu_get_root_table_entry %d0
>> 2263
>> 2264 /* Check if logical address 32MB aligned,
>> 2265 * so we can try to map it once
>> 2266 */
>> 2267 movel %a3,%d0
>> 2268 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
>> 2269 jne 1f
>> 2270
>> 2271 /* Is there enough to map for 32MB at once
>> 2272 */
>> 2273 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
>> 2274 cmpl %a1,%a4
>> 2275 jcs 1f
>> 2276
>> 2277 addql #1,%a1
>> 2278
>> 2279 /* The root table entry must not no be busy
>> 2280 */
>> 2281 tstl %a0@
>> 2282 jne L(mmu_map_error)
>> 2283
>> 2284 /* Do the mapping and advance the pointers
>> 2285 */
>> 2286 dputs "early term1"
>> 2287 dputn %a2
>> 2288 dputn %a3
>> 2289 dputn %a1
>> 2290 dputc '\n'
>> 2291 movel %a2,%a0@
>> 2292
>> 2293 movel %a1,%a3
>> 2294 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
>> 2295 jra L(mmu_mapnext_030)
>> 2296 1:
>> 2297 /* Calculate the offset into the pointer table
>> 2298 */
>> 2299 movel %a3,%d0
>> 2300 moveq #PTR_INDEX_SHIFT,%d1
>> 2301 lsrl %d1,%d0
>> 2302 andl #PTR_TABLE_SIZE-1,%d0
>> 2303 mmu_get_ptr_table_entry %a0,%d0
>> 2304
>> 2305 /* The pointer table entry must not no be busy
>> 2306 */
>> 2307 tstl %a0@
>> 2308 jne L(mmu_map_error)
>> 2309
>> 2310 /* Do the mapping and advance the pointers
>> 2311 */
>> 2312 dputs "early term2"
>> 2313 dputn %a2
>> 2314 dputn %a3
>> 2315 dputc '\n'
>> 2316 movel %a2,%a0@
>> 2317
>> 2318 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2
>> 2319 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3
>> 2320
>> 2321 L(mmu_mapnext_030):
>> 2322 /* Ready with mapping?
>> 2323 */
>> 2324 lea %a3@(-1),%a0
>> 2325 cmpl %a0,%a4
>> 2326 jhi L(mmu_map_030)
>> 2327 jra L(mmu_map_done)
>> 2328
>> 2329 L(mmu_map_error):
>> 2330
>> 2331 dputs "mmu_map error:"
>> 2332 dputn %a2
>> 2333 dputn %a3
>> 2334 dputc '\n'
>> 2335
>> 2336 L(mmu_map_done):
>> 2337
>> 2338 func_return mmu_map
>> 2339
>> 2340 /*
>> 2341 * mmu_fixup
>> 2342 *
>> 2343 * On the 040 class machines, all pages that are used for the
>> 2344 * mmu have to be fixed up.
>> 2345 */
>> 2346
>> 2347 func_start mmu_fixup_page_mmu_cache,%d0/%a0
>> 2348
>> 2349 dputs "mmu_fixup_page_mmu_cache"
>> 2350 dputn ARG1
>> 2351
>> 2352 /* Calculate the offset into the root table
>> 2353 */
>> 2354 movel ARG1,%d0
>> 2355 moveq #ROOT_INDEX_SHIFT,%d1
>> 2356 lsrl %d1,%d0
>> 2357 mmu_get_root_table_entry %d0
>> 2358
>> 2359 /* Calculate the offset into the pointer table
>> 2360 */
>> 2361 movel ARG1,%d0
>> 2362 moveq #PTR_INDEX_SHIFT,%d1
>> 2363 lsrl %d1,%d0
>> 2364 andl #PTR_TABLE_SIZE-1,%d0
>> 2365 mmu_get_ptr_table_entry %a0,%d0
>> 2366
>> 2367 /* Calculate the offset into the page table
>> 2368 */
>> 2369 movel ARG1,%d0
>> 2370 moveq #PAGE_INDEX_SHIFT,%d1
>> 2371 lsrl %d1,%d0
>> 2372 andl #PAGE_TABLE_SIZE-1,%d0
>> 2373 mmu_get_page_table_entry %a0,%d0
>> 2374
>> 2375 movel %a0@,%d0
>> 2376 andil #_CACHEMASK040,%d0
>> 2377 orl %pc@(m68k_pgtable_cachemode),%d0
>> 2378 movel %d0,%a0@
>> 2379
>> 2380 dputc '\n'
>> 2381
>> 2382 func_return mmu_fixup_page_mmu_cache
>> 2383
>> 2384 /*
>> 2385 * mmu_temp_map
>> 2386 *
>> 2387 * create a temporary mapping to enable the mmu,
>> 2388 * this we don't need any transparation translation tricks.
>> 2389 */
>> 2390
>> 2391 func_start mmu_temp_map,%d0/%d1/%a0/%a1
>> 2392
>> 2393 dputs "mmu_temp_map"
>> 2394 dputn ARG1
>> 2395 dputn ARG2
>> 2396 dputc '\n'
>> 2397
>> 2398 lea %pc@(L(temp_mmap_mem)),%a1
>> 2399
>> 2400 /* Calculate the offset in the root table
>> 2401 */
>> 2402 movel ARG2,%d0
>> 2403 moveq #ROOT_INDEX_SHIFT,%d1
>> 2404 lsrl %d1,%d0
>> 2405 mmu_get_root_table_entry %d0
>> 2406
>> 2407 /* Check if the table is temporary allocated, so we have to reuse it
>> 2408 */
>> 2409 movel %a0@,%d0
>> 2410 cmpl %pc@(L(memory_start)),%d0
>> 2411 jcc 1f
>> 2412
>> 2413 /* Temporary allocate a ptr table and insert it into the root table
>> 2414 */
>> 2415 movel %a1@,%d0
>> 2416 addl #PTR_TABLE_SIZE*4,%a1@
>> 2417 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2418 movel %d0,%a0@
>> 2419 dputs " (new)"
>> 2420 1:
>> 2421 dputn %d0
>> 2422 /* Mask the root table entry for the ptr table
>> 2423 */
>> 2424 andw #-ROOT_TABLE_SIZE,%d0
>> 2425 movel %d0,%a0
>> 2426
>> 2427 /* Calculate the offset into the pointer table
>> 2428 */
>> 2429 movel ARG2,%d0
>> 2430 moveq #PTR_INDEX_SHIFT,%d1
>> 2431 lsrl %d1,%d0
>> 2432 andl #PTR_TABLE_SIZE-1,%d0
>> 2433 lea %a0@(%d0*4),%a0
>> 2434 dputn %a0
>> 2435
>> 2436 /* Check if a temporary page table is already allocated
>> 2437 */
>> 2438 movel %a0@,%d0
>> 2439 jne 1f
>> 2440
>> 2441 /* Temporary allocate a page table and insert it into the ptr table
>> 2442 */
>> 2443 movel %a1@,%d0
>> 2444 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
>> 2445 alignment restriction for pointer tables on the '0[46]0. */
>> 2446 addl #512,%a1@
>> 2447 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2448 movel %d0,%a0@
>> 2449 dputs " (new)"
>> 2450 1:
>> 2451 dputn %d0
>> 2452 /* Mask the ptr table entry for the page table
>> 2453 */
>> 2454 andw #-PTR_TABLE_SIZE,%d0
>> 2455 movel %d0,%a0
>> 2456
>> 2457 /* Calculate the offset into the page table
>> 2458 */
>> 2459 movel ARG2,%d0
>> 2460 moveq #PAGE_INDEX_SHIFT,%d1
>> 2461 lsrl %d1,%d0
>> 2462 andl #PAGE_TABLE_SIZE-1,%d0
>> 2463 lea %a0@(%d0*4),%a0
>> 2464 dputn %a0
>> 2465
>> 2466 /* Insert the address into the page table
>> 2467 */
>> 2468 movel ARG1,%d0
>> 2469 andw #-PAGESIZE,%d0
>> 2470 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2471 movel %d0,%a0@
>> 2472 dputn %d0
>> 2473
>> 2474 dputc '\n'
>> 2475
>> 2476 func_return mmu_temp_map
>> 2477
>> 2478 func_start mmu_engage,%d0-%d2/%a0-%a3
>> 2479
>> 2480 moveq #ROOT_TABLE_SIZE-1,%d0
>> 2481 /* Temporarily use a different root table. */
>> 2482 lea %pc@(L(kernel_pgdir_ptr)),%a0
>> 2483 movel %a0@,%a2
>> 2484 movel %pc@(L(memory_start)),%a1
>> 2485 movel %a1,%a0@
>> 2486 movel %a2,%a0
>> 2487 1:
>> 2488 movel %a0@+,%a1@+
>> 2489 dbra %d0,1b
>> 2490
>> 2491 lea %pc@(L(temp_mmap_mem)),%a0
>> 2492 movel %a1,%a0@
>> 2493
>> 2494 movew #PAGESIZE-1,%d0
>> 2495 1:
>> 2496 clrl %a1@+
>> 2497 dbra %d0,1b
>> 2498
>> 2499 lea %pc@(1b),%a0
>> 2500 movel #1b,%a1
>> 2501 /* Skip temp mappings if phys == virt */
>> 2502 cmpl %a0,%a1
>> 2503 jeq 1f
>> 2504
>> 2505 mmu_temp_map %a0,%a0
>> 2506 mmu_temp_map %a0,%a1
>> 2507
>> 2508 addw #PAGESIZE,%a0
>> 2509 addw #PAGESIZE,%a1
>> 2510 mmu_temp_map %a0,%a0
>> 2511 mmu_temp_map %a0,%a1
>> 2512 1:
>> 2513 movel %pc@(L(memory_start)),%a3
>> 2514 movel %pc@(L(phys_kernel_start)),%d2
>> 2515
>> 2516 is_not_040_or_060(L(mmu_engage_030))
>> 2517
>> 2518 L(mmu_engage_040):
>> 2519 .chip 68040
>> 2520 nop
>> 2521 cinva %bc
>> 2522 nop
>> 2523 pflusha
>> 2524 nop
>> 2525 movec %a3,%srp
>> 2526 movel #TC_ENABLE+TC_PAGE4K,%d0
>> 2527 movec %d0,%tc /* enable the MMU */
>> 2528 jmp 1f:l
>> 2529 1: nop
>> 2530 movec %a2,%srp
>> 2531 nop
>> 2532 cinva %bc
>> 2533 nop
>> 2534 pflusha
>> 2535 .chip 68k
>> 2536 jra L(mmu_engage_cleanup)
>> 2537
>> 2538 L(mmu_engage_030_temp):
>> 2539 .space 12
>> 2540 L(mmu_engage_030):
>> 2541 .chip 68030
>> 2542 lea %pc@(L(mmu_engage_030_temp)),%a0
>> 2543 movel #0x80000002,%a0@
>> 2544 movel %a3,%a0@(4)
>> 2545 movel #0x0808,%d0
>> 2546 movec %d0,%cacr
>> 2547 pmove %a0@,%srp
>> 2548 pflusha
>> 2549 /*
>> 2550 * enable,super root enable,4096 byte pages,7 bit root index,
>> 2551 * 7 bit pointer index, 6 bit page table index.
>> 2552 */
>> 2553 movel #0x82c07760,%a0@(8)
>> 2554 pmove %a0@(8),%tc /* enable the MMU */
>> 2555 jmp 1f:l
>> 2556 1: movel %a2,%a0@(4)
>> 2557 movel #0x0808,%d0
>> 2558 movec %d0,%cacr
>> 2559 pmove %a0@,%srp
>> 2560 pflusha
>> 2561 .chip 68k
>> 2562
>> 2563 L(mmu_engage_cleanup):
>> 2564 subl #PAGE_OFFSET,%d2
>> 2565 subl %d2,%a2
>> 2566 movel %a2,L(kernel_pgdir_ptr)
>> 2567 subl %d2,%fp
>> 2568 subl %d2,%sp
>> 2569 subl %d2,ARG0
>> 2570
>> 2571 func_return mmu_engage
>> 2572
>> 2573 func_start mmu_get_root_table_entry,%d0/%a1
>> 2574
>> 2575 #if 0
>> 2576 dputs "mmu_get_root_table_entry:"
>> 2577 dputn ARG1
>> 2578 dputs " ="
>> 2579 #endif
>> 2580
>> 2581 movel %pc@(L(kernel_pgdir_ptr)),%a0
>> 2582 tstl %a0
>> 2583 jne 2f
>> 2584
>> 2585 dputs "\nmmu_init:"
>> 2586
>> 2587 /* Find the start of free memory, get_bi_record does this for us,
>> 2588 * as the bootinfo structure is located directly behind the kernel
>> 2589 * and and we simply search for the last entry.
>> 2590 */
>> 2591 get_bi_record BI_LAST
>> 2592 addw #PAGESIZE-1,%a0
>> 2593 movel %a0,%d0
>> 2594 andw #-PAGESIZE,%d0
>> 2595
>> 2596 dputn %d0
>> 2597
>> 2598 lea %pc@(L(memory_start)),%a0
>> 2599 movel %d0,%a0@
>> 2600 lea %pc@(L(kernel_end)),%a0
>> 2601 movel %d0,%a0@
>> 2602
>> 2603 /* we have to return the first page at _stext since the init code
>> 2604 * in mm/init.c simply expects kernel_pg_dir there, the rest of
>> 2605 * page is used for further ptr tables in get_ptr_table.
>> 2606 */
>> 2607 lea %pc@(_stext),%a0
>> 2608 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2609 movel %a0,%a1@
>> 2610 addl #ROOT_TABLE_SIZE*4,%a1@
>> 2611
>> 2612 lea %pc@(L(mmu_num_pointer_tables)),%a1
>> 2613 addql #1,%a1@
>> 2614
>> 2615 /* clear the page
>> 2616 */
>> 2617 movel %a0,%a1
>> 2618 movew #PAGESIZE/4-1,%d0
>> 2619 1:
>> 2620 clrl %a1@+
>> 2621 dbra %d0,1b
>> 2622
>> 2623 lea %pc@(L(kernel_pgdir_ptr)),%a1
>> 2624 movel %a0,%a1@
>> 2625
>> 2626 dputn %a0
>> 2627 dputc '\n'
>> 2628 2:
>> 2629 movel ARG1,%d0
>> 2630 lea %a0@(%d0*4),%a0
>> 2631
>> 2632 #if 0
>> 2633 dputn %a0
>> 2634 dputc '\n'
>> 2635 #endif
>> 2636
>> 2637 func_return mmu_get_root_table_entry
>> 2638
>> 2639
>> 2640
>> 2641 func_start mmu_get_ptr_table_entry,%d0/%a1
>> 2642
>> 2643 #if 0
>> 2644 dputs "mmu_get_ptr_table_entry:"
>> 2645 dputn ARG1
>> 2646 dputn ARG2
>> 2647 dputs " ="
>> 2648 #endif
>> 2649
>> 2650 movel ARG1,%a0
>> 2651 movel %a0@,%d0
>> 2652 jne 2f
>> 2653
>> 2654 /* Keep track of the number of pointer tables we use
>> 2655 */
>> 2656 dputs "\nmmu_get_new_ptr_table:"
>> 2657 lea %pc@(L(mmu_num_pointer_tables)),%a0
>> 2658 movel %a0@,%d0
>> 2659 addql #1,%a0@
>> 2660
>> 2661 /* See if there is a free pointer table in our cache of pointer tables
>> 2662 */
>> 2663 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2664 andw #7,%d0
>> 2665 jne 1f
>> 2666
>> 2667 /* Get a new pointer table page from above the kernel memory
>> 2668 */
>> 2669 get_new_page
>> 2670 movel %a0,%a1@
>> 2671 1:
>> 2672 /* There is an unused pointer table in our cache... use it
>> 2673 */
>> 2674 movel %a1@,%d0
>> 2675 addl #PTR_TABLE_SIZE*4,%a1@
>> 2676
>> 2677 dputn %d0
>> 2678 dputc '\n'
>> 2679
>> 2680 /* Insert the new pointer table into the root table
>> 2681 */
>> 2682 movel ARG1,%a0
>> 2683 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2684 movel %d0,%a0@
>> 2685 2:
>> 2686 /* Extract the pointer table entry
>> 2687 */
>> 2688 andw #-PTR_TABLE_SIZE,%d0
>> 2689 movel %d0,%a0
>> 2690 movel ARG2,%d0
>> 2691 lea %a0@(%d0*4),%a0
>> 2692
>> 2693 #if 0
>> 2694 dputn %a0
>> 2695 dputc '\n'
>> 2696 #endif
>> 2697
>> 2698 func_return mmu_get_ptr_table_entry
>> 2699
>> 2700
>> 2701 func_start mmu_get_page_table_entry,%d0/%a1
>> 2702
>> 2703 #if 0
>> 2704 dputs "mmu_get_page_table_entry:"
>> 2705 dputn ARG1
>> 2706 dputn ARG2
>> 2707 dputs " ="
>> 2708 #endif
>> 2709
>> 2710 movel ARG1,%a0
>> 2711 movel %a0@,%d0
>> 2712 jne 2f
>> 2713
>> 2714 /* If the page table entry doesn't exist, we allocate a complete new
>> 2715 * page and use it as one continues big page table which can cover
>> 2716 * 4MB of memory, nearly almost all mappings have that alignment.
>> 2717 */
>> 2718 get_new_page
>> 2719 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0
>> 2720
>> 2721 /* align pointer table entry for a page of page tables
>> 2722 */
>> 2723 movel ARG1,%d0
>> 2724 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
>> 2725 movel %d0,%a1
>> 2726
>> 2727 /* Insert the page tables into the pointer entries
>> 2728 */
>> 2729 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
>> 2730 1:
>> 2731 movel %a0,%a1@+
>> 2732 lea %a0@(PAGE_TABLE_SIZE*4),%a0
>> 2733 dbra %d0,1b
>> 2734
>> 2735 /* Now we can get the initialized pointer table entry
>> 2736 */
>> 2737 movel ARG1,%a0
>> 2738 movel %a0@,%d0
>> 2739 2:
>> 2740 /* Extract the page table entry
>> 2741 */
>> 2742 andw #-PAGE_TABLE_SIZE,%d0
>> 2743 movel %d0,%a0
>> 2744 movel ARG2,%d0
>> 2745 lea %a0@(%d0*4),%a0
>> 2746
>> 2747 #if 0
>> 2748 dputn %a0
>> 2749 dputc '\n'
>> 2750 #endif
>> 2751
>> 2752 func_return mmu_get_page_table_entry
>> 2753
>> 2754 /*
>> 2755 * get_new_page
>> 2756 *
>> 2757 * Return a new page from the memory start and clear it.
>> 2758 */
>> 2759 func_start get_new_page,%d0/%a1
>> 2760
>> 2761 dputs "\nget_new_page:"
>> 2762
>> 2763 /* allocate the page and adjust memory_start
>> 2764 */
>> 2765 lea %pc@(L(memory_start)),%a0
>> 2766 movel %a0@,%a1
>> 2767 addl #PAGESIZE,%a0@
>> 2768
>> 2769 /* clear the new page
>> 2770 */
>> 2771 movel %a1,%a0
>> 2772 movew #PAGESIZE/4-1,%d0
>> 2773 1:
>> 2774 clrl %a1@+
>> 2775 dbra %d0,1b
>> 2776
>> 2777 dputn %a0
>> 2778 dputc '\n'
>> 2779
>> 2780 func_return get_new_page
>> 2781
>> 2782
>> 2783
>> 2784 /*
>> 2785 * Debug output support
>> 2786 * Atarians have a choice between the parallel port, the serial port
>> 2787 * from the MFP or a serial port of the SCC
>> 2788 */
>> 2789
>> 2790 #ifdef CONFIG_MAC
>> 2791
>> 2792 L(scc_initable_mac):
>> 2793 .byte 9,12 /* Reset */
>> 2794 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2795 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2796 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2797 .byte 9,0 /* no interrupts */
>> 2798 .byte 10,0 /* NRZ */
>> 2799 .byte 11,0x50 /* use baud rate generator */
>> 2800 .byte 12,10,13,0 /* 9600 baud */
>> 2801 .byte 14,1 /* Baud rate generator enable */
>> 2802 .byte 3,0xc1 /* enable receiver */
>> 2803 .byte 5,0xea /* enable transmitter */
>> 2804 .byte -1
>> 2805 .even
>> 2806 #endif
>> 2807
>> 2808 #ifdef CONFIG_ATARI
>> 2809 /* #define USE_PRINTER */
>> 2810 /* #define USE_SCC_B */
>> 2811 /* #define USE_SCC_A */
>> 2812 #define USE_MFP
>> 2813
>> 2814 #if defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2815 #define USE_SCC
>> 2816 /* Initialisation table for SCC */
>> 2817 L(scc_initable):
>> 2818 .byte 9,12 /* Reset */
>> 2819 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2820 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2821 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2822 .byte 9,0 /* no interrupts */
>> 2823 .byte 10,0 /* NRZ */
>> 2824 .byte 11,0x50 /* use baud rate generator */
>> 2825 .byte 12,24,13,0 /* 9600 baud */
>> 2826 .byte 14,2,14,3 /* use master clock for BRG, enable */
>> 2827 .byte 3,0xc1 /* enable receiver */
>> 2828 .byte 5,0xea /* enable transmitter */
>> 2829 .byte -1
>> 2830 .even
>> 2831 #endif
>> 2832
>> 2833 #ifdef USE_PRINTER
>> 2834
>> 2835 LPSG_SELECT = 0xff8800
>> 2836 LPSG_READ = 0xff8800
>> 2837 LPSG_WRITE = 0xff8802
>> 2838 LPSG_IO_A = 14
>> 2839 LPSG_IO_B = 15
>> 2840 LPSG_CONTROL = 7
>> 2841 LSTMFP_GPIP = 0xfffa01
>> 2842 LSTMFP_DDR = 0xfffa05
>> 2843 LSTMFP_IERB = 0xfffa09
>> 2844
>> 2845 #elif defined(USE_SCC_B)
>> 2846
>> 2847 LSCC_CTRL = 0xff8c85
>> 2848 LSCC_DATA = 0xff8c87
>> 2849
>> 2850 #elif defined(USE_SCC_A)
>> 2851
>> 2852 LSCC_CTRL = 0xff8c81
>> 2853 LSCC_DATA = 0xff8c83
>> 2854
>> 2855 #elif defined(USE_MFP)
>> 2856
>> 2857 LMFP_UCR = 0xfffa29
>> 2858 LMFP_TDCDR = 0xfffa1d
>> 2859 LMFP_TDDR = 0xfffa25
>> 2860 LMFP_TSR = 0xfffa2d
>> 2861 LMFP_UDR = 0xfffa2f
>> 2862
>> 2863 #endif
>> 2864 #endif /* CONFIG_ATARI */
>> 2865
>> 2866 /*
>> 2867 * Serial port output support.
>> 2868 */
>> 2869
>> 2870 /*
>> 2871 * Initialize serial port hardware for 9600/8/1
>> 2872 */
>> 2873 func_start serial_init,%d0/%d1/%a0/%a1
>> 2874 /*
>> 2875 * Some of the register usage that follows
>> 2876 * CONFIG_AMIGA
>> 2877 * a0 = pointer to boot info record
>> 2878 * d0 = boot info offset
>> 2879 * CONFIG_ATARI
>> 2880 * a0 = address of SCC
>> 2881 * a1 = Liobase address/address of scc_initable
>> 2882 * d0 = init data for serial port
>> 2883 * CONFIG_MAC
>> 2884 * a0 = address of SCC
>> 2885 * a1 = address of scc_initable_mac
>> 2886 * d0 = init data for serial port
>> 2887 */
>> 2888
>> 2889 #ifdef CONFIG_AMIGA
>> 2890 #define SERIAL_DTR 7
>> 2891 #define SERIAL_CNTRL CIABBASE+C_PRA
>> 2892
>> 2893 is_not_amiga(1f)
>> 2894 lea %pc@(L(custom)),%a0
>> 2895 movel #-ZTWOBASE,%a0@
>> 2896 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
>> 2897 get_bi_record BI_AMIGA_SERPER
>> 2898 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2899 | movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2900 1:
>> 2901 #endif
>> 2902 #ifdef CONFIG_ATARI
>> 2903 is_not_atari(4f)
>> 2904 movel %pc@(L(iobase)),%a1
>> 2905 #if defined(USE_PRINTER)
>> 2906 bclr #0,%a1@(LSTMFP_IERB)
>> 2907 bclr #0,%a1@(LSTMFP_DDR)
>> 2908 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT)
>> 2909 moveb #0xff,%a1@(LPSG_WRITE)
>> 2910 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 2911 clrb %a1@(LPSG_WRITE)
>> 2912 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 2913 moveb %a1@(LPSG_READ),%d0
>> 2914 bset #5,%d0
>> 2915 moveb %d0,%a1@(LPSG_WRITE)
>> 2916 #elif defined(USE_SCC)
>> 2917 lea %a1@(LSCC_CTRL),%a0
>> 2918 lea %pc@(L(scc_initable)),%a1
>> 2919 2: moveb %a1@+,%d0
>> 2920 jmi 3f
>> 2921 moveb %d0,%a0@
>> 2922 moveb %a1@+,%a0@
>> 2923 jra 2b
>> 2924 3: clrb %a0@
>> 2925 #elif defined(USE_MFP)
>> 2926 bclr #1,%a1@(LMFP_TSR)
>> 2927 moveb #0x88,%a1@(LMFP_UCR)
>> 2928 andb #0x70,%a1@(LMFP_TDCDR)
>> 2929 moveb #2,%a1@(LMFP_TDDR)
>> 2930 orb #1,%a1@(LMFP_TDCDR)
>> 2931 bset #1,%a1@(LMFP_TSR)
>> 2932 #endif
>> 2933 jra L(serial_init_done)
>> 2934 4:
>> 2935 #endif
>> 2936 #ifdef CONFIG_MAC
>> 2937 is_not_mac(L(serial_init_not_mac))
>> 2938 #ifdef MAC_SERIAL_DEBUG
>> 2939 #if !defined(MAC_USE_SCC_A) && !defined(MAC_USE_SCC_B)
>> 2940 #define MAC_USE_SCC_B
>> 2941 #endif
>> 2942 #define mac_scc_cha_b_ctrl_offset 0x0
>> 2943 #define mac_scc_cha_a_ctrl_offset 0x2
>> 2944 #define mac_scc_cha_b_data_offset 0x4
>> 2945 #define mac_scc_cha_a_data_offset 0x6
>> 2946
>> 2947 #ifdef MAC_USE_SCC_A
>> 2948 /* Initialize channel A */
>> 2949 movel %pc@(L(mac_sccbase)),%a0
>> 2950 lea %pc@(L(scc_initable_mac)),%a1
>> 2951 5: moveb %a1@+,%d0
>> 2952 jmi 6f
>> 2953 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2954 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2955 jra 5b
>> 2956 6:
>> 2957 #endif /* MAC_USE_SCC_A */
>> 2958
>> 2959 #ifdef MAC_USE_SCC_B
>> 2960 /* Initialize channel B */
>> 2961 #ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */
>> 2962 movel %pc@(L(mac_sccbase)),%a0
>> 2963 #endif /* MAC_USE_SCC_A */
>> 2964 lea %pc@(L(scc_initable_mac)),%a1
>> 2965 7: moveb %a1@+,%d0
>> 2966 jmi 8f
>> 2967 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2968 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2969 jra 7b
>> 2970 8:
>> 2971 #endif /* MAC_USE_SCC_B */
>> 2972 #endif /* MAC_SERIAL_DEBUG */
>> 2973
>> 2974 jra L(serial_init_done)
>> 2975 L(serial_init_not_mac):
>> 2976 #endif /* CONFIG_MAC */
>> 2977
>> 2978 #ifdef CONFIG_Q40
>> 2979 is_not_q40(2f)
>> 2980 /* debug output goes into SRAM, so we don't do it unless requested
>> 2981 - check for '%LX$' signature in SRAM */
>> 2982 lea %pc@(q40_mem_cptr),%a1
>> 2983 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */
>> 2984 move.l #0xff020000,%a1
>> 2985 cmp.b #'%',%a1@
>> 2986 bne 2f /*nodbg*/
>> 2987 addq.w #4,%a1
>> 2988 cmp.b #'L',%a1@
>> 2989 bne 2f /*nodbg*/
>> 2990 addq.w #4,%a1
>> 2991 cmp.b #'X',%a1@
>> 2992 bne 2f /*nodbg*/
>> 2993 addq.w #4,%a1
>> 2994 cmp.b #'$',%a1@
>> 2995 bne 2f /*nodbg*/
>> 2996 /* signature OK */
>> 2997 lea %pc@(L(q40_do_debug)),%a1
>> 2998 tas %a1@
>> 2999 /*nodbg: q40_do_debug is 0 by default*/
>> 3000 2:
>> 3001 #endif
>> 3002
>> 3003 #ifdef CONFIG_APOLLO
>> 3004 /* We count on the PROM initializing SIO1 */
>> 3005 #endif
>> 3006
>> 3007 L(serial_init_done):
>> 3008 func_return serial_init
>> 3009
>> 3010 /*
>> 3011 * Output character on serial port.
>> 3012 */
>> 3013 func_start serial_putc,%d0/%d1/%a0/%a1
>> 3014
>> 3015 movel ARG1,%d0
>> 3016 cmpib #'\n',%d0
>> 3017 jbne 1f
>> 3018
>> 3019 /* A little safe recursion is good for the soul */
>> 3020 serial_putc #'\r'
>> 3021 1:
>> 3022
>> 3023 #ifdef CONFIG_AMIGA
>> 3024 is_not_amiga(2f)
>> 3025 andw #0x00ff,%d0
>> 3026 oriw #0x0100,%d0
>> 3027 movel %pc@(L(custom)),%a0
>> 3028 movew %d0,%a0@(CUSTOMBASE+C_SERDAT)
>> 3029 1: movew %a0@(CUSTOMBASE+C_SERDATR),%d0
>> 3030 andw #0x2000,%d0
>> 3031 jeq 1b
>> 3032 jra L(serial_putc_done)
>> 3033 2:
>> 3034 #endif
>> 3035
>> 3036 #ifdef CONFIG_MAC
>> 3037 is_not_mac(5f)
>> 3038
>> 3039 #ifdef MAC_SERIAL_DEBUG
>> 3040
>> 3041 #ifdef MAC_USE_SCC_A
>> 3042 movel %pc@(L(mac_sccbase)),%a1
>> 3043 3: btst #2,%a1@(mac_scc_cha_a_ctrl_offset)
>> 3044 jeq 3b
>> 3045 moveb %d0,%a1@(mac_scc_cha_a_data_offset)
>> 3046 #endif /* MAC_USE_SCC_A */
>> 3047
>> 3048 #ifdef MAC_USE_SCC_B
>> 3049 #ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */
>> 3050 movel %pc@(L(mac_sccbase)),%a1
>> 3051 #endif /* MAC_USE_SCC_A */
>> 3052 4: btst #2,%a1@(mac_scc_cha_b_ctrl_offset)
>> 3053 jeq 4b
>> 3054 moveb %d0,%a1@(mac_scc_cha_b_data_offset)
>> 3055 #endif /* MAC_USE_SCC_B */
>> 3056
>> 3057 #endif /* MAC_SERIAL_DEBUG */
>> 3058
>> 3059 jra L(serial_putc_done)
>> 3060 5:
>> 3061 #endif /* CONFIG_MAC */
>> 3062
>> 3063 #ifdef CONFIG_ATARI
>> 3064 is_not_atari(4f)
>> 3065 movel %pc@(L(iobase)),%a1
>> 3066 #if defined(USE_PRINTER)
>> 3067 3: btst #0,%a1@(LSTMFP_GPIP)
>> 3068 jne 3b
>> 3069 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 3070 moveb %d0,%a1@(LPSG_WRITE)
>> 3071 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 3072 moveb %a1@(LPSG_READ),%d0
>> 3073 bclr #5,%d0
>> 3074 moveb %d0,%a1@(LPSG_WRITE)
>> 3075 nop
>> 3076 nop
>> 3077 bset #5,%d0
>> 3078 moveb %d0,%a1@(LPSG_WRITE)
>> 3079 #elif defined(USE_SCC)
>> 3080 3: btst #2,%a1@(LSCC_CTRL)
>> 3081 jeq 3b
>> 3082 moveb %d0,%a1@(LSCC_DATA)
>> 3083 #elif defined(USE_MFP)
>> 3084 3: btst #7,%a1@(LMFP_TSR)
>> 3085 jeq 3b
>> 3086 moveb %d0,%a1@(LMFP_UDR)
>> 3087 #endif
>> 3088 jra L(serial_putc_done)
>> 3089 4:
>> 3090 #endif /* CONFIG_ATARI */
>> 3091
>> 3092 #ifdef CONFIG_MVME147
>> 3093 is_not_mvme147(2f)
>> 3094 1: btst #2,M147_SCC_CTRL_A
>> 3095 jeq 1b
>> 3096 moveb %d0,M147_SCC_DATA_A
>> 3097 jbra L(serial_putc_done)
>> 3098 2:
>> 3099 #endif
>> 3100
>> 3101 #ifdef CONFIG_MVME16x
>> 3102 is_not_mvme16x(2f)
>> 3103 /*
>> 3104 * If the loader gave us a board type then we can use that to
>> 3105 * select an appropriate output routine; otherwise we just use
>> 3106 * the Bug code. If we haev to use the Bug that means the Bug
>> 3107 * workspace has to be valid, which means the Bug has to use
>> 3108 * the SRAM, which is non-standard.
>> 3109 */
>> 3110 moveml %d0-%d7/%a2-%a6,%sp@-
>> 3111 movel vme_brdtype,%d1
>> 3112 jeq 1f | No tag - use the Bug
>> 3113 cmpi #VME_TYPE_MVME162,%d1
>> 3114 jeq 6f
>> 3115 cmpi #VME_TYPE_MVME172,%d1
>> 3116 jne 5f
>> 3117 /* 162/172; it's an SCC */
>> 3118 6: btst #2,M162_SCC_CTRL_A
>> 3119 nop
>> 3120 nop
>> 3121 nop
>> 3122 jeq 6b
>> 3123 moveb #8,M162_SCC_CTRL_A
>> 3124 nop
>> 3125 nop
>> 3126 nop
>> 3127 moveb %d0,M162_SCC_CTRL_A
>> 3128 jra 3f
>> 3129 5:
>> 3130 /* 166/167/177; it's a CD2401 */
>> 3131 moveb #0,M167_CYCAR
>> 3132 moveb M167_CYIER,%d2
>> 3133 moveb #0x02,M167_CYIER
>> 3134 7:
>> 3135 btst #5,M167_PCSCCTICR
>> 3136 jeq 7b
>> 3137 moveb M167_PCTPIACKR,%d1
>> 3138 moveb M167_CYLICR,%d1
>> 3139 jeq 8f
>> 3140 moveb #0x08,M167_CYTEOIR
>> 3141 jra 7b
>> 3142 8:
>> 3143 moveb %d0,M167_CYTDR
>> 3144 moveb #0,M167_CYTEOIR
>> 3145 moveb %d2,M167_CYIER
>> 3146 jra 3f
>> 3147 1:
>> 3148 moveb %d0,%sp@-
>> 3149 trap #15
>> 3150 .word 0x0020 /* TRAP 0x020 */
>> 3151 3:
>> 3152 moveml %sp@+,%d0-%d7/%a2-%a6
>> 3153 jbra L(serial_putc_done)
>> 3154 2:
>> 3155 #endif CONFIG_MVME16x
>> 3156
>> 3157 #ifdef CONFIG_BVME6000
>> 3158 is_not_bvme6000(2f)
>> 3159 /*
>> 3160 * The BVME6000 machine has a serial port ...
>> 3161 */
>> 3162 1: btst #2,BVME_SCC_CTRL_A
>> 3163 jeq 1b
>> 3164 moveb %d0,BVME_SCC_DATA_A
>> 3165 jbra L(serial_putc_done)
>> 3166 2:
>> 3167 #endif
>> 3168
>> 3169 #ifdef CONFIG_SUN3X
>> 3170 is_not_sun3x(2f)
>> 3171 movel %d0,-(%sp)
>> 3172 movel 0xFEFE0018,%a1
>> 3173 jbsr (%a1)
>> 3174 addq #4,%sp
>> 3175 jbra L(serial_putc_done)
>> 3176 2:
>> 3177 #endif
>> 3178
>> 3179 #ifdef CONFIG_Q40
>> 3180 is_not_q40(2f)
>> 3181 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */
>> 3182 beq 2f
>> 3183 lea %pc@(q40_mem_cptr),%a1
>> 3184 move.l %a1@,%a0
>> 3185 move.b %d0,%a0@
>> 3186 addq.l #4,%a0
>> 3187 move.l %a0,%a1@
>> 3188 jbra L(serial_putc_done)
>> 3189 2:
>> 3190 #endif
>> 3191
>> 3192 #ifdef CONFIG_APOLLO
>> 3193 is_not_apollo(2f)
>> 3194 movl %pc@(L(iobase)),%a1
>> 3195 moveb %d0,%a1@(LTHRB0)
>> 3196 1: moveb %a1@(LSRB0),%d0
>> 3197 andb #0x4,%d0
>> 3198 beq 1b
>> 3199 2:
>> 3200 #endif
>> 3201
>> 3202 L(serial_putc_done):
>> 3203 func_return serial_putc
>> 3204
>> 3205 /*
>> 3206 * Output a string.
>> 3207 */
>> 3208 func_start puts,%d0/%a0
>> 3209
>> 3210 movel ARG1,%a0
>> 3211 jra 2f
>> 3212 1:
>> 3213 #ifdef CONSOLE
>> 3214 console_putc %d0
>> 3215 #endif
>> 3216 #ifdef SERIAL_DEBUG
>> 3217 serial_putc %d0
>> 3218 #endif
>> 3219 2: moveb %a0@+,%d0
>> 3220 jne 1b
>> 3221
>> 3222 func_return puts
>> 3223
>> 3224 /*
>> 3225 * Output number in hex notation.
>> 3226 */
>> 3227
>> 3228 func_start putn,%d0-%d2
>> 3229
>> 3230 putc ' '
>> 3231
>> 3232 movel ARG1,%d0
>> 3233 moveq #7,%d1
>> 3234 1: roll #4,%d0
>> 3235 move %d0,%d2
>> 3236 andb #0x0f,%d2
>> 3237 addb #'0',%d2
>> 3238 cmpb #'9',%d2
>> 3239 jls 2f
>> 3240 addb #'A'-('9'+1),%d2
>> 3241 2:
>> 3242 #ifdef CONSOLE
>> 3243 console_putc %d2
>> 3244 #endif
>> 3245 #ifdef SERIAL_DEBUG
>> 3246 serial_putc %d2
>> 3247 #endif
>> 3248 dbra %d1,1b
>> 3249
>> 3250 func_return putn
>> 3251
>> 3252 #ifdef CONFIG_MAC
>> 3253 /*
>> 3254 * mac_serial_print
>> 3255 *
>> 3256 * This routine takes its parameters on the stack. It then
>> 3257 * turns around and calls the internal routine. This routine
>> 3258 * is used until the Linux console driver initializes itself.
>> 3259 *
>> 3260 * The calling parameters are:
>> 3261 * void mac_serial_print(const char *str);
>> 3262 *
>> 3263 * This routine does NOT understand variable arguments only
>> 3264 * simple strings!
>> 3265 */
>> 3266 ENTRY(mac_serial_print)
>> 3267 moveml %d0/%a0,%sp@-
>> 3268 #if 1
>> 3269 move %sr,%sp@-
>> 3270 ori #0x0700,%sr
>> 3271 #endif
>> 3272 movel %sp@(10),%a0 /* fetch parameter */
>> 3273 jra 2f
>> 3274 1: serial_putc %d0
>> 3275 2: moveb %a0@+,%d0
>> 3276 jne 1b
>> 3277 #if 1
>> 3278 move %sp@+,%sr
>> 3279 #endif
>> 3280 moveml %sp@+,%d0/%a0
>> 3281 rts
>> 3282 #endif /* CONFIG_MAC */
>> 3283
>> 3284 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3285 func_start set_leds,%d0/%a0
>> 3286 movel ARG1,%d0
>> 3287 #ifdef CONFIG_HP300
>> 3288 is_not_hp300(1f)
>> 3289 movel %pc@(L(custom)),%a0
>> 3290 moveb %d0,%a0@(0x1ffff)
>> 3291 jra 2f
>> 3292 #endif
>> 3293 1:
>> 3294 #ifdef CONFIG_APOLLO
>> 3295 movel %pc@(L(iobase)),%a0
>> 3296 lsll #8,%d0
>> 3297 eorw #0xff00,%d0
>> 3298 moveb %d0,%a0@(LCPUCTRL)
>> 3299 #endif
>> 3300 2:
>> 3301 func_return set_leds
>> 3302 #endif
>> 3303
>> 3304 #ifdef CONSOLE
>> 3305 /*
>> 3306 * For continuity, see the data alignment
>> 3307 * to which this structure is tied.
>> 3308 */
>> 3309 #define Lconsole_struct_cur_column 0
>> 3310 #define Lconsole_struct_cur_row 4
>> 3311 #define Lconsole_struct_num_columns 8
>> 3312 #define Lconsole_struct_num_rows 12
>> 3313 #define Lconsole_struct_left_edge 16
>> 3314 #define Lconsole_struct_penguin_putc 20
>> 3315
>> 3316 L(console_init):
>> 3317 /*
>> 3318 * Some of the register usage that follows
>> 3319 * a0 = pointer to boot_info
>> 3320 * a1 = pointer to screen
>> 3321 * a2 = pointer to Lconsole_globals
>> 3322 * d3 = pixel width of screen
>> 3323 * d4 = pixel height of screen
>> 3324 * (d3,d4) ~= (x,y) of a point just below
>> 3325 * and to the right of the screen
>> 3326 * NOT on the screen!
>> 3327 * d5 = number of bytes per scan line
>> 3328 * d6 = number of bytes on the entire screen
>> 3329 */
>> 3330 moveml %a0-%a4/%d0-%d7,%sp@-
>> 3331
>> 3332 lea %pc@(L(console_globals)),%a2
>> 3333 lea %pc@(L(mac_videobase)),%a0
>> 3334 movel %a0@,%a1
>> 3335 lea %pc@(L(mac_rowbytes)),%a0
>> 3336 movel %a0@,%d5
>> 3337 lea %pc@(L(mac_dimensions)),%a0
>> 3338 movel %a0@,%d3 /* -> low byte */
>> 3339 movel %d3,%d4
>> 3340 swap %d4 /* -> high byte */
>> 3341 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3342 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3343
>> 3344 movel %d5,%d6
>> 3345 subl #20,%d6
>> 3346 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3347 divul #8,%d6 /* we'll clear 8 bytes at a time */
>> 3348 subq #1,%d6
>> 3349
>> 3350 console_clear_loop:
>> 3351 movel #0xffffffff,%a1@+ /* Mac_black */
>> 3352 movel #0xffffffff,%a1@+ /* Mac_black */
>> 3353 dbra %d6,console_clear_loop
>> 3354
>> 3355 /* Calculate font size */
>> 3356
>> 3357 #if defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
>> 3358 lea %pc@(font_vga_8x8),%a0
>> 3359 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
>> 3360 lea %pc@(font_vga_8x16),%a0
>> 3361 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
>> 3362 lea %pc@(font_vga_6x11),%a0
>> 3363 #elif defined(CONFIG_FONT_8x8) /* default */
>> 3364 lea %pc@(font_vga_8x8),%a0
>> 3365 #else /* no compiled-in font */
>> 3366 lea 0,%a0
>> 3367 #endif
>> 3368
>> 3369 /*
>> 3370 * At this point we make a shift in register usage
>> 3371 * a1 = address of Lconsole_font pointer
>> 3372 */
>> 3373 lea %pc@(L(console_font)),%a1
>> 3374 movel %a0,%a1@ /* store pointer to struct font_desc in Lconsole_font */
>> 3375 tstl %a0
>> 3376 jeq 1f
>> 3377
>> 3378 /*
>> 3379 * Calculate global maxs
>> 3380 * Note - we can use either an
>> 3381 * 8 x 16 or 8 x 8 character font
>> 3382 * 6 x 11 also supported
>> 3383 */
>> 3384 /* ASSERT: a0 = contents of Lconsole_font */
>> 3385 movel %d3,%d0 /* screen width in pixels */
>> 3386 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */
>> 3387
>> 3388 movel %d4,%d1 /* screen height in pixels */
>> 3389 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */
>> 3390
>> 3391 movel %d0,%a2@(Lconsole_struct_num_columns)
>> 3392 movel %d1,%a2@(Lconsole_struct_num_rows)
>> 3393
>> 3394 /*
>> 3395 * Clear the current row and column
>> 3396 */
>> 3397 clrl %a2@(Lconsole_struct_cur_column)
>> 3398 clrl %a2@(Lconsole_struct_cur_row)
>> 3399 clrl %a2@(Lconsole_struct_left_edge)
>> 3400
>> 3401 /*
>> 3402 * Initialization is complete
>> 3403 */
>> 3404 1: moveml %sp@+,%a0-%a4/%d0-%d7
>> 3405 rts
>> 3406
>> 3407 L(console_put_stats):
>> 3408 /*
>> 3409 * Some of the register usage that follows
>> 3410 * a0 = pointer to boot_info
>> 3411 * d7 = value of boot_info fields
>> 3412 */
>> 3413 moveml %a0/%d7,%sp@-
>> 3414
>> 3415 puts "\nMacLinux\n\n"
>> 3416
>> 3417 #ifdef SERIAL_DEBUG
>> 3418 puts " vidaddr:"
>> 3419 putn %pc@(L(mac_videobase)) /* video addr. */
>> 3420
>> 3421 puts "\n _stext:"
>> 3422 lea %pc@(_stext),%a0
>> 3423 putn %a0
>> 3424
>> 3425 puts "\nbootinfo:"
>> 3426 lea %pc@(_end),%a0
>> 3427 putn %a0
>> 3428
>> 3429 puts "\ncpuid:"
>> 3430 putn %pc@(L(cputype))
>> 3431 putc '\n'
>> 3432
>> 3433 #ifdef MAC_SERIAL_DEBUG
>> 3434 putn %pc@(L(mac_sccbase))
>> 3435 putc '\n'
>> 3436 #endif
>> 3437 # if defined(MMU_PRINT)
>> 3438 jbsr mmu_print_machine_cpu_types
>> 3439 # endif /* MMU_PRINT */
>> 3440 #endif /* SERIAL_DEBUG */
>> 3441
>> 3442 moveml %sp@+,%a0/%d7
>> 3443 rts
>> 3444
>> 3445 #ifdef CONSOLE_PENGUIN
>> 3446 L(console_put_penguin):
>> 3447 /*
>> 3448 * Get 'that_penguin' onto the screen in the upper right corner
>> 3449 * penguin is 64 x 74 pixels, align against right edge of screen
>> 3450 */
>> 3451 moveml %a0-%a1/%d0-%d7,%sp@-
>> 3452
>> 3453 lea %pc@(L(mac_dimensions)),%a0
>> 3454 movel %a0@,%d0
>> 3455 andil #0xffff,%d0
>> 3456 subil #64,%d0 /* snug up against the right edge */
>> 3457 clrl %d1 /* start at the top */
>> 3458 movel #73,%d7
>> 3459 lea %pc@(that_penguin),%a1
>> 3460 console_penguin_row:
>> 3461 movel #31,%d6
>> 3462 console_penguin_pixel_pair:
>> 3463 moveb %a1@,%d2
>> 3464 lsrb #4,%d2
>> 3465 jbsr console_plot_pixel
>> 3466 addq #1,%d0
>> 3467 moveb %a1@+,%d2
>> 3468 jbsr console_plot_pixel
>> 3469 addq #1,%d0
>> 3470 dbra %d6,console_penguin_pixel_pair
>> 3471
>> 3472 subil #64,%d0
>> 3473 addq #1,%d1
>> 3474 dbra %d7,console_penguin_row
>> 3475
>> 3476 moveml %sp@+,%a0-%a1/%d0-%d7
>> 3477 rts
>> 3478 #endif
>> 3479
>> 3480 console_scroll:
>> 3481 moveml %a0-%a4/%d0-%d7,%sp@-
>> 3482
>> 3483 /*
>> 3484 * Calculate source and destination addresses
>> 3485 * output a1 = dest
>> 3486 * a2 = source
>> 3487 */
>> 3488 lea %pc@(L(mac_videobase)),%a0
>> 3489 movel %a0@,%a1
>> 3490 movel %a1,%a2
>> 3491 lea %pc@(L(mac_rowbytes)),%a0
>> 3492 movel %a0@,%d5
>> 3493 movel %pc@(L(console_font)),%a0
>> 3494 tstl %a0
>> 3495 jeq 1f
>> 3496 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */
>> 3497 addal %d5,%a2
>> 3498
>> 3499 /*
>> 3500 * Get dimensions
>> 3501 */
>> 3502 lea %pc@(L(mac_dimensions)),%a0
>> 3503 movel %a0@,%d3
>> 3504 movel %d3,%d4
>> 3505 swap %d4
>> 3506 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3507 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3508
>> 3509 /*
>> 3510 * Calculate number of bytes to move
>> 3511 */
>> 3512 lea %pc@(L(mac_rowbytes)),%a0
>> 3513 movel %a0@,%d6
>> 3514 movel %pc@(L(console_font)),%a0
>> 3515 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */
>> 3516 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3517 divul #32,%d6 /* we'll move 8 longs at a time */
>> 3518 subq #1,%d6
>> 3519
>> 3520 console_scroll_loop:
>> 3521 movel %a2@+,%a1@+
>> 3522 movel %a2@+,%a1@+
>> 3523 movel %a2@+,%a1@+
>> 3524 movel %a2@+,%a1@+
>> 3525 movel %a2@+,%a1@+
>> 3526 movel %a2@+,%a1@+
>> 3527 movel %a2@+,%a1@+
>> 3528 movel %a2@+,%a1@+
>> 3529 dbra %d6,console_scroll_loop
>> 3530
>> 3531 lea %pc@(L(mac_rowbytes)),%a0
>> 3532 movel %a0@,%d6
>> 3533 movel %pc@(L(console_font)),%a0
>> 3534 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */
>> 3535 divul #32,%d6 /* we'll move 8 words at a time */
>> 3536 subq #1,%d6
>> 3537
>> 3538 moveq #-1,%d0
>> 3539 console_scroll_clear_loop:
>> 3540 movel %d0,%a1@+
>> 3541 movel %d0,%a1@+
>> 3542 movel %d0,%a1@+
>> 3543 movel %d0,%a1@+
>> 3544 movel %d0,%a1@+
>> 3545 movel %d0,%a1@+
>> 3546 movel %d0,%a1@+
>> 3547 movel %d0,%a1@+
>> 3548 dbra %d6,console_scroll_clear_loop
>> 3549
>> 3550 1: moveml %sp@+,%a0-%a4/%d0-%d7
>> 3551 rts
>> 3552
>> 3553
>> 3554 func_start console_putc,%a0/%a1/%d0-%d7
>> 3555
>> 3556 is_not_mac(console_exit)
>> 3557 tstl %pc@(L(console_font))
>> 3558 jeq console_exit
>> 3559
>> 3560 /* Output character in d7 on console.
>> 3561 */
>> 3562 movel ARG1,%d7
>> 3563 cmpib #'\n',%d7
>> 3564 jbne 1f
>> 3565
>> 3566 /* A little safe recursion is good for the soul */
>> 3567 console_putc #'\r'
>> 3568 1:
>> 3569 lea %pc@(L(console_globals)),%a0
>> 3570
>> 3571 cmpib #10,%d7
>> 3572 jne console_not_lf
>> 3573 movel %a0@(Lconsole_struct_cur_row),%d0
>> 3574 addil #1,%d0
>> 3575 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3576 movel %a0@(Lconsole_struct_num_rows),%d1
>> 3577 cmpl %d1,%d0
>> 3578 jcs 1f
>> 3579 subil #1,%d0
>> 3580 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3581 jbsr console_scroll
>> 3582 1:
>> 3583 jra console_exit
>> 3584
>> 3585 console_not_lf:
>> 3586 cmpib #13,%d7
>> 3587 jne console_not_cr
>> 3588 clrl %a0@(Lconsole_struct_cur_column)
>> 3589 jra console_exit
>> 3590
>> 3591 console_not_cr:
>> 3592 cmpib #1,%d7
>> 3593 jne console_not_home
>> 3594 clrl %a0@(Lconsole_struct_cur_row)
>> 3595 clrl %a0@(Lconsole_struct_cur_column)
>> 3596 jra console_exit
>> 3597
>> 3598 /*
>> 3599 * At this point we know that the %d7 character is going to be
>> 3600 * rendered on the screen. Register usage is -
>> 3601 * a0 = pointer to console globals
>> 3602 * a1 = font data
>> 3603 * d0 = cursor column
>> 3604 * d1 = cursor row to draw the character
>> 3605 * d7 = character number
>> 3606 */
>> 3607 console_not_home:
>> 3608 movel %a0@(Lconsole_struct_cur_column),%d0
>> 3609 addil #1,%a0@(Lconsole_struct_cur_column)
>> 3610 movel %a0@(Lconsole_struct_num_columns),%d1
>> 3611 cmpl %d1,%d0
>> 3612 jcs 1f
>> 3613 console_putc #'\n' /* recursion is OK! */
>> 3614 1:
>> 3615 movel %a0@(Lconsole_struct_cur_row),%d1
>> 3616
>> 3617 /*
>> 3618 * At this point we make a shift in register usage
>> 3619 * a0 = address of pointer to font data (font_desc)
>> 3620 */
>> 3621 movel %pc@(L(console_font)),%a0
>> 3622 movel %a0@(FONT_DESC_DATA),%a1 /* Load font_desc.data into a1 */
>> 3623 andl #0x000000ff,%d7
>> 3624 /* ASSERT: a0 = contents of Lconsole_font */
>> 3625 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */
>> 3626 addl %d7,%a1 /* a1 = points to char image */
>> 3627
>> 3628 /*
>> 3629 * At this point we make a shift in register usage
>> 3630 * d0 = pixel coordinate, x
>> 3631 * d1 = pixel coordinate, y
>> 3632 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen
>> 3633 * d3 = font scan line data (8 pixels)
>> 3634 * d6 = count down for the font's pixel width (8)
>> 3635 * d7 = count down for the font's pixel count in height
>> 3636 */
>> 3637 /* ASSERT: a0 = contents of Lconsole_font */
>> 3638 mulul %a0@(FONT_DESC_WIDTH),%d0
>> 3639 mulul %a0@(FONT_DESC_HEIGHT),%d1
>> 3640 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load font_desc.height into d7 */
>> 3641 subq #1,%d7
>> 3642 console_read_char_scanline:
>> 3643 moveb %a1@+,%d3
>> 3644
>> 3645 /* ASSERT: a0 = contents of Lconsole_font */
>> 3646 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load font_desc.width into d6 */
>> 3647 subql #1,%d6
>> 3648
>> 3649 console_do_font_scanline:
>> 3650 lslb #1,%d3
>> 3651 scsb %d2 /* convert 1 bit into a byte */
>> 3652 jbsr console_plot_pixel
>> 3653 addq #1,%d0
>> 3654 dbra %d6,console_do_font_scanline
>> 3655
>> 3656 /* ASSERT: a0 = contents of Lconsole_font */
>> 3657 subl %a0@(FONT_DESC_WIDTH),%d0
>> 3658 addq #1,%d1
>> 3659 dbra %d7,console_read_char_scanline
>> 3660
>> 3661 console_exit:
>> 3662
>> 3663 func_return console_putc
>> 3664
>> 3665 console_plot_pixel:
>> 3666 /*
>> 3667 * Input:
>> 3668 * d0 = x coordinate
>> 3669 * d1 = y coordinate
>> 3670 * d2 = (bit 0) 1/0 for white/black (!)
>> 3671 * All registers are preserved
>> 3672 */
>> 3673 moveml %a0-%a1/%d0-%d4,%sp@-
>> 3674
>> 3675 lea %pc@(L(mac_videobase)),%a0
>> 3676 movel %a0@,%a1
>> 3677 lea %pc@(L(mac_videodepth)),%a0
>> 3678 movel %a0@,%d3
>> 3679 lea %pc@(L(mac_rowbytes)),%a0
>> 3680 mulul %a0@,%d1
>> 3681
>> 3682 /*
>> 3683 * Register usage:
>> 3684 * d0 = x coord becomes byte offset into frame buffer
>> 3685 * d1 = y coord
>> 3686 * d2 = black or white (0/1)
>> 3687 * d3 = video depth
>> 3688 * d4 = temp of x (d0) for many bit depths
>> 3689 * d5 = unused
>> 3690 * d6 = unused
>> 3691 * d7 = unused
>> 3692 */
>> 3693 test_1bit:
>> 3694 cmpb #1,%d3
>> 3695 jbne test_2bit
>> 3696 movel %d0,%d4 /* we need the low order 3 bits! */
>> 3697 divul #8,%d0
>> 3698 addal %d0,%a1
>> 3699 addal %d1,%a1
>> 3700 andb #7,%d4
>> 3701 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3702 andb #1,%d2
>> 3703 jbne white_1
>> 3704 bsetb %d4,%a1@
>> 3705 jbra console_plot_pixel_exit
>> 3706 white_1:
>> 3707 bclrb %d4,%a1@
>> 3708 jbra console_plot_pixel_exit
>> 3709
>> 3710 test_2bit:
>> 3711 cmpb #2,%d3
>> 3712 jbne test_4bit
>> 3713 movel %d0,%d4 /* we need the low order 2 bits! */
>> 3714 divul #4,%d0
>> 3715 addal %d0,%a1
>> 3716 addal %d1,%a1
>> 3717 andb #3,%d4
>> 3718 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3719 lsll #1,%d4 /* ! */
>> 3720 andb #1,%d2
>> 3721 jbne white_2
>> 3722 bsetb %d4,%a1@
>> 3723 addq #1,%d4
>> 3724 bsetb %d4,%a1@
>> 3725 jbra console_plot_pixel_exit
>> 3726 white_2:
>> 3727 bclrb %d4,%a1@
>> 3728 addq #1,%d4
>> 3729 bclrb %d4,%a1@
>> 3730 jbra console_plot_pixel_exit
>> 3731
>> 3732 test_4bit:
>> 3733 cmpb #4,%d3
>> 3734 jbne test_8bit
>> 3735 movel %d0,%d4 /* we need the low order bit! */
>> 3736 divul #2,%d0
>> 3737 addal %d0,%a1
>> 3738 addal %d1,%a1
>> 3739 andb #1,%d4
>> 3740 eorb #1,%d4
>> 3741 lsll #2,%d4 /* ! */
>> 3742 andb #1,%d2
>> 3743 jbne white_4
>> 3744 bsetb %d4,%a1@
>> 3745 addq #1,%d4
>> 3746 bsetb %d4,%a1@
>> 3747 addq #1,%d4
>> 3748 bsetb %d4,%a1@
>> 3749 addq #1,%d4
>> 3750 bsetb %d4,%a1@
>> 3751 jbra console_plot_pixel_exit
>> 3752 white_4:
>> 3753 bclrb %d4,%a1@
>> 3754 addq #1,%d4
>> 3755 bclrb %d4,%a1@
>> 3756 addq #1,%d4
>> 3757 bclrb %d4,%a1@
>> 3758 addq #1,%d4
>> 3759 bclrb %d4,%a1@
>> 3760 jbra console_plot_pixel_exit
>> 3761
>> 3762 test_8bit:
>> 3763 cmpb #8,%d3
>> 3764 jbne test_16bit
>> 3765 addal %d0,%a1
>> 3766 addal %d1,%a1
>> 3767 andb #1,%d2
>> 3768 jbne white_8
>> 3769 moveb #0xff,%a1@
>> 3770 jbra console_plot_pixel_exit
>> 3771 white_8:
>> 3772 clrb %a1@
>> 3773 jbra console_plot_pixel_exit
>> 3774
>> 3775 test_16bit:
>> 3776 cmpb #16,%d3
>> 3777 jbne console_plot_pixel_exit
>> 3778 addal %d0,%a1
>> 3779 addal %d0,%a1
>> 3780 addal %d1,%a1
>> 3781 andb #1,%d2
>> 3782 jbne white_16
>> 3783 clrw %a1@
>> 3784 jbra console_plot_pixel_exit
>> 3785 white_16:
>> 3786 movew #0x0fff,%a1@
>> 3787 jbra console_plot_pixel_exit
>> 3788
>> 3789 console_plot_pixel_exit:
>> 3790 moveml %sp@+,%a0-%a1/%d0-%d4
>> 3791 rts
>> 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 #ifdef CONFIG_HP300
>> 3831 hp300_phys_ram_base:
>> 3832 #endif
>> 3833
>> 3834 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
>> 3835 defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3836 L(custom):
>> 3837 L(iobase):
>> 3838 .long 0
>> 3839 #endif
>> 3840
>> 3841 #ifdef CONFIG_MAC
>> 3842 L(console_video_virtual):
>> 3843 .long 0
>> 3844 #endif /* CONFIG_MAC */
>> 3845
>> 3846 #if defined(CONSOLE)
>> 3847 L(console_globals):
>> 3848 .long 0 /* cursor column */
>> 3849 .long 0 /* cursor row */
>> 3850 .long 0 /* max num columns */
>> 3851 .long 0 /* max num rows */
>> 3852 .long 0 /* left edge */
>> 3853 .long 0 /* mac putc */
>> 3854 L(console_font):
>> 3855 .long 0 /* pointer to console font (struct font_desc) */
>> 3856 #endif /* CONSOLE */
>> 3857
>> 3858 #if defined(MMU_PRINT)
>> 3859 L(mmu_print_data):
>> 3860 .long 0 /* valid flag */
>> 3861 .long 0 /* start logical */
>> 3862 .long 0 /* next logical */
>> 3863 .long 0 /* start physical */
>> 3864 .long 0 /* next physical */
>> 3865 #endif /* MMU_PRINT */
>> 3866
>> 3867 L(cputype):
>> 3868 .long 0
>> 3869 L(mmu_cached_pointer_tables):
>> 3870 .long 0
>> 3871 L(mmu_num_pointer_tables):
>> 3872 .long 0
>> 3873 L(phys_kernel_start):
>> 3874 .long 0
>> 3875 L(kernel_end):
>> 3876 .long 0
>> 3877 L(memory_start):
>> 3878 .long 0
>> 3879 L(kernel_pgdir_ptr):
>> 3880 .long 0
>> 3881 L(temp_mmap_mem):
>> 3882 .long 0
>> 3883
>> 3884 #if defined (CONFIG_MVME147)
>> 3885 M147_SCC_CTRL_A = 0xfffe3002
>> 3886 M147_SCC_DATA_A = 0xfffe3003
>> 3887 #endif
>> 3888
>> 3889 #if defined (CONFIG_MVME16x)
>> 3890 M162_SCC_CTRL_A = 0xfff45005
>> 3891 M167_CYCAR = 0xfff450ee
>> 3892 M167_CYIER = 0xfff45011
>> 3893 M167_CYLICR = 0xfff45026
>> 3894 M167_CYTEOIR = 0xfff45085
>> 3895 M167_CYTDR = 0xfff450f8
>> 3896 M167_PCSCCTICR = 0xfff4201e
>> 3897 M167_PCTPIACKR = 0xfff42025
>> 3898 #endif
>> 3899
>> 3900 #if defined (CONFIG_BVME6000)
>> 3901 BVME_SCC_CTRL_A = 0xffb0000b
>> 3902 BVME_SCC_DATA_A = 0xffb0000f
>> 3903 #endif
>> 3904
>> 3905 #if defined(CONFIG_MAC)
>> 3906 L(mac_booter_data):
>> 3907 .long 0
>> 3908 L(mac_videobase):
>> 3909 .long 0
>> 3910 L(mac_videodepth):
>> 3911 .long 0
>> 3912 L(mac_dimensions):
>> 3913 .long 0
>> 3914 L(mac_rowbytes):
>> 3915 .long 0
>> 3916 #ifdef MAC_SERIAL_DEBUG
>> 3917 L(mac_sccbase):
>> 3918 .long 0
>> 3919 #endif /* MAC_SERIAL_DEBUG */
>> 3920 #endif
>> 3921
>> 3922 #if defined (CONFIG_APOLLO)
>> 3923 LSRB0 = 0x10412
>> 3924 LTHRB0 = 0x10416
>> 3925 LCPUCTRL = 0x10100
>> 3926 #endif
>> 3927
>> 3928 __FINIT
>> 3929 .data
>> 3930 .align 4
>> 3931
>> 3932 availmem:
>> 3933 .long 0
>> 3934 m68k_pgtable_cachemode:
>> 3935 .long 0
>> 3936 m68k_supervisor_cachemode:
>> 3937 .long 0
>> 3938 #if defined(CONFIG_MVME16x)
>> 3939 mvme_bdid:
>> 3940 .long 0,0,0,0,0,0,0,0
>> 3941 #endif
>> 3942 #if defined(CONFIG_Q40)
>> 3943 q40_mem_cptr:
>> 3944 .long 0
>> 3945 L(q40_do_debug):
>> 3946 .long 0
>> 3947 #endif
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