1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 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 ** 1999/02/11 Richard Zidlicky: added Q40 support (initial version 99/01/01)
>> 27 ** 2004/05/13 Kars de Jong: Finalised HP300 support
>> 28 **
>> 29 ** This file is subject to the terms and conditions of the GNU General Public
>> 30 ** License. See the file README.legal in the main directory of this archive
>> 31 ** for more details.
>> 32 **
>> 33 */
>> 34
2 /* 35 /*
3 * ARC CPU startup Code !! 36 * Linux startup code.
>> 37 *
>> 38 * At this point, the boot loader has:
>> 39 * Disabled interrupts
>> 40 * Disabled caches
>> 41 * Put us in supervisor state.
>> 42 *
>> 43 * The kernel setup code takes the following steps:
>> 44 * . Raise interrupt level
>> 45 * . Set up initial kernel memory mapping.
>> 46 * . This sets up a mapping of the 4M of memory the kernel is located in.
>> 47 * . It also does a mapping of any initial machine specific areas.
>> 48 * . Enable the MMU
>> 49 * . Enable cache memories
>> 50 * . Jump to kernel startup
>> 51 *
>> 52 * Much of the file restructuring was to accomplish:
>> 53 * 1) Remove register dependency through-out the file.
>> 54 * 2) Increase use of subroutines to perform functions
>> 55 * 3) Increase readability of the code
>> 56 *
>> 57 * Of course, readability is a subjective issue, so it will never be
>> 58 * argued that that goal was accomplished. It was merely a goal.
>> 59 * A key way to help make code more readable is to give good
>> 60 * documentation. So, the first thing you will find is exaustive
>> 61 * write-ups on the structure of the file, and the features of the
>> 62 * functional subroutines.
>> 63 *
>> 64 * General Structure:
>> 65 * ------------------
>> 66 * Without a doubt the single largest chunk of head.S is spent
>> 67 * mapping the kernel and I/O physical space into the logical range
>> 68 * for the kernel.
>> 69 * There are new subroutines and data structures to make MMU
>> 70 * support cleaner and easier to understand.
>> 71 * First, you will find a routine call "mmu_map" which maps
>> 72 * a logical to a physical region for some length given a cache
>> 73 * type on behalf of the caller. This routine makes writing the
>> 74 * actual per-machine specific code very simple.
>> 75 * A central part of the code, but not a subroutine in itself,
>> 76 * is the mmu_init code which is broken down into mapping the kernel
>> 77 * (the same for all machines) and mapping machine-specific I/O
>> 78 * regions.
>> 79 * Also, there will be a description of engaging the MMU and
>> 80 * caches.
>> 81 * You will notice that there is a chunk of code which
>> 82 * can emit the entire MMU mapping of the machine. This is present
>> 83 * only in debug modes and can be very helpful.
>> 84 * Further, there is a new console driver in head.S that is
>> 85 * also only engaged in debug mode. Currently, it's only supported
>> 86 * on the Macintosh class of machines. However, it is hoped that
>> 87 * others will plug-in support for specific machines.
>> 88 *
>> 89 * ######################################################################
>> 90 *
>> 91 * mmu_map
>> 92 * -------
>> 93 * mmu_map was written for two key reasons. First, it was clear
>> 94 * that it was very difficult to read the previous code for mapping
>> 95 * regions of memory. Second, the Macintosh required such extensive
>> 96 * memory allocations that it didn't make sense to propagate the
>> 97 * existing code any further.
>> 98 * mmu_map requires some parameters:
>> 99 *
>> 100 * mmu_map (logical, physical, length, cache_type)
>> 101 *
>> 102 * While this essentially describes the function in the abstract, you'll
>> 103 * find more indepth description of other parameters at the implementation site.
>> 104 *
>> 105 * mmu_get_root_table_entry
>> 106 * ------------------------
>> 107 * mmu_get_ptr_table_entry
>> 108 * -----------------------
>> 109 * mmu_get_page_table_entry
>> 110 * ------------------------
>> 111 *
>> 112 * These routines are used by other mmu routines to get a pointer into
>> 113 * a table, if necessary a new table is allocated. These routines are working
>> 114 * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root
>> 115 * table needs of course only to be allocated once in mmu_get_root_table_entry,
>> 116 * so that here also some mmu specific initialization is done. The second page
>> 117 * at the start of the kernel (the first page is unmapped later) is used for
>> 118 * the kernel_pg_dir. It must be at a position known at link time (as it's used
>> 119 * to initialize the init task struct) and since it needs special cache
>> 120 * settings, it's the easiest to use this page, the rest of the page is used
>> 121 * for further pointer tables.
>> 122 * mmu_get_page_table_entry allocates always a whole page for page tables, this
>> 123 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
>> 124 * to manage page tables in smaller pieces as nearly all mappings have that
>> 125 * size.
>> 126 *
>> 127 * ######################################################################
>> 128 *
>> 129 *
>> 130 * ######################################################################
>> 131 *
>> 132 * mmu_engage
>> 133 * ----------
>> 134 * Thanks to a small helping routine enabling the mmu got quite simple
>> 135 * and there is only one way left. mmu_engage makes a complete a new mapping
>> 136 * that only includes the absolute necessary to be able to jump to the final
>> 137 * position and to restore the original mapping.
>> 138 * As this code doesn't need a transparent translation register anymore this
>> 139 * means all registers are free to be used by machines that needs them for
>> 140 * other purposes.
>> 141 *
>> 142 * ######################################################################
>> 143 *
>> 144 * mmu_print
>> 145 * ---------
>> 146 * This algorithm will print out the page tables of the system as
>> 147 * appropriate for an 030 or an 040. This is useful for debugging purposes
>> 148 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
>> 149 *
>> 150 * ######################################################################
>> 151 *
>> 152 * console_init
>> 153 * ------------
>> 154 * The console is also able to be turned off. The console in head.S
>> 155 * is specifically for debugging and can be very useful. It is surrounded by
>> 156 * #ifdef / #endif clauses so it doesn't have to ship in known-good
>> 157 * kernels. It's basic algorithm is to determine the size of the screen
>> 158 * (in height/width and bit depth) and then use that information for
>> 159 * displaying an 8x8 font or an 8x16 (widthxheight). I prefer the 8x8 for
>> 160 * debugging so I can see more good data. But it was trivial to add support
>> 161 * for both fonts, so I included it.
>> 162 * Also, the algorithm for plotting pixels is abstracted so that in
>> 163 * theory other platforms could add support for different kinds of frame
>> 164 * buffers. This could be very useful.
>> 165 *
>> 166 * console_put_penguin
>> 167 * -------------------
>> 168 * An important part of any Linux bring up is the penguin and there's
>> 169 * nothing like getting the Penguin on the screen! This algorithm will work
>> 170 * on any machine for which there is a console_plot_pixel.
>> 171 *
>> 172 * console_scroll
>> 173 * --------------
>> 174 * My hope is that the scroll algorithm does the right thing on the
>> 175 * various platforms, but it wouldn't be hard to add the test conditions
>> 176 * and new code if it doesn't.
>> 177 *
>> 178 * console_putc
>> 179 * -------------
>> 180 *
>> 181 * ######################################################################
>> 182 *
>> 183 * Register usage has greatly simplified within head.S. Every subroutine
>> 184 * saves and restores all registers that it modifies (except it returns a
>> 185 * value in there of course). So the only register that needs to be initialized
>> 186 * is the stack pointer.
>> 187 * All other init code and data is now placed in the init section, so it will
>> 188 * be automatically freed at the end of the kernel initialization.
>> 189 *
>> 190 * ######################################################################
>> 191 *
>> 192 * options
>> 193 * -------
>> 194 * There are many options available in a build of this file. I've
>> 195 * taken the time to describe them here to save you the time of searching
>> 196 * for them and trying to understand what they mean.
>> 197 *
>> 198 * CONFIG_xxx: These are the obvious machine configuration defines created
>> 199 * during configuration. These are defined in autoconf.h.
>> 200 *
>> 201 * CONSOLE_DEBUG: Only supports a Mac frame buffer but could easily be
>> 202 * extended 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.
>> 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.
4 * 244 *
5 * Copyright (C) 2004, 2007-2010, 2011-2012 Sy !! 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.
6 * 250 *
7 * Vineetg: Dec 2007 !! 251 * Macintosh constants:
8 * -Check if we are running on Simulator or o !! 252 * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug.
9 * to skip certain things during boot on !! 253 * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug.
10 */ 254 */
11 255
12 #include <linux/linkage.h> 256 #include <linux/linkage.h>
13 #include <asm/asm-offsets.h> !! 257 #include <linux/init.h>
>> 258 #include <asm/bootinfo.h>
>> 259 #include <asm/bootinfo-amiga.h>
>> 260 #include <asm/bootinfo-atari.h>
>> 261 #include <asm/bootinfo-hp300.h>
>> 262 #include <asm/bootinfo-mac.h>
>> 263 #include <asm/bootinfo-q40.h>
>> 264 #include <asm/bootinfo-vme.h>
>> 265 #include <asm/setup.h>
14 #include <asm/entry.h> 266 #include <asm/entry.h>
15 #include <asm/arcregs.h> !! 267 #include <asm/pgtable.h>
16 #include <asm/cache.h> !! 268 #include <asm/page.h>
17 #include <asm/dsp-impl.h> !! 269 #include <asm/asm-offsets.h>
18 #include <asm/irqflags.h> !! 270 #ifdef CONFIG_MAC
19 !! 271 # include <asm/machw.h>
20 .macro CPU_EARLY_SETUP !! 272 #endif
21 !! 273
22 ; Setting up Vectror Table (in case ex !! 274 #ifdef CONFIG_EARLY_PRINTK
23 sr @_int_vec_base_lds, [AUX_INTR_ !! 275 # define SERIAL_DEBUG
24 !! 276 # if defined(CONFIG_MAC) && defined(CONFIG_FONT_SUPPORT)
25 ; Disable I-cache/D-cache if kernel so !! 277 # define CONSOLE_DEBUG
26 lr r5, [ARC_REG_IC_BCR] !! 278 # endif
27 breq r5, 0, 1f ; I$ d !! 279 #endif
28 lr r5, [ARC_REG_IC_CTRL] !! 280
29 #ifdef CONFIG_ARC_HAS_ICACHE !! 281 #undef MMU_PRINT
30 bclr r5, r5, 0 ; 0 - !! 282 #undef MMU_NOCACHE_KERNEL
>> 283 #undef DEBUG
>> 284
>> 285 /*
>> 286 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
>> 287 * The 8x8 font is harder to read but fits more on the screen.
>> 288 */
>> 289 #define FONT_8x8 /* default */
>> 290 /* #define FONT_8x16 */ /* 2nd choice */
>> 291 /* #define FONT_6x11 */ /* 3rd choice */
>> 292
>> 293 .globl kernel_pg_dir
>> 294 .globl availmem
>> 295 .globl m68k_init_mapped_size
>> 296 .globl m68k_pgtable_cachemode
>> 297 .globl m68k_supervisor_cachemode
>> 298 #ifdef CONFIG_MVME16x
>> 299 .globl mvme_bdid
>> 300 #endif
>> 301 #ifdef CONFIG_Q40
>> 302 .globl q40_mem_cptr
>> 303 #endif
>> 304
>> 305 CPUTYPE_040 = 1 /* indicates an 040 */
>> 306 CPUTYPE_060 = 2 /* indicates an 060 */
>> 307 CPUTYPE_0460 = 3 /* if either above are set, this is set */
>> 308 CPUTYPE_020 = 4 /* indicates an 020 */
>> 309
>> 310 /* Translation control register */
>> 311 TC_ENABLE = 0x8000
>> 312 TC_PAGE8K = 0x4000
>> 313 TC_PAGE4K = 0x0000
>> 314
>> 315 /* Transparent translation registers */
>> 316 TTR_ENABLE = 0x8000 /* enable transparent translation */
>> 317 TTR_ANYMODE = 0x4000 /* user and kernel mode access */
>> 318 TTR_KERNELMODE = 0x2000 /* only kernel mode access */
>> 319 TTR_USERMODE = 0x0000 /* only user mode access */
>> 320 TTR_CI = 0x0400 /* inhibit cache */
>> 321 TTR_RW = 0x0200 /* read/write mode */
>> 322 TTR_RWM = 0x0100 /* read/write mask */
>> 323 TTR_FCB2 = 0x0040 /* function code base bit 2 */
>> 324 TTR_FCB1 = 0x0020 /* function code base bit 1 */
>> 325 TTR_FCB0 = 0x0010 /* function code base bit 0 */
>> 326 TTR_FCM2 = 0x0004 /* function code mask bit 2 */
>> 327 TTR_FCM1 = 0x0002 /* function code mask bit 1 */
>> 328 TTR_FCM0 = 0x0001 /* function code mask bit 0 */
>> 329
>> 330 /* Cache Control registers */
>> 331 CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */
>> 332 CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */
>> 333 CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */
>> 334 CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */
>> 335 CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */
>> 336 CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */
>> 337 CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */
>> 338 CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */
>> 339 CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */
>> 340 CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */
>> 341 CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */
>> 342 CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */
>> 343 CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */
>> 344 CC3_CLR_D = 0x00000800 /* clear data cache (68030) */
>> 345 CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */
>> 346 CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */
>> 347 CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */
>> 348 CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */
>> 349 CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */
>> 350 CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */
>> 351 CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */
>> 352 CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */
>> 353
>> 354 /* Miscellaneous definitions */
>> 355 PAGESIZE = 4096
>> 356 PAGESHIFT = 12
>> 357
>> 358 ROOT_TABLE_SIZE = 128
>> 359 PTR_TABLE_SIZE = 128
>> 360 PAGE_TABLE_SIZE = 64
>> 361 ROOT_INDEX_SHIFT = 25
>> 362 PTR_INDEX_SHIFT = 18
>> 363 PAGE_INDEX_SHIFT = 12
>> 364
>> 365 #ifdef DEBUG
>> 366 /* When debugging use readable names for labels */
>> 367 #ifdef __STDC__
>> 368 #define L(name) .head.S.##name
>> 369 #else
>> 370 #define L(name) .head.S./**/name
>> 371 #endif
31 #else 372 #else
32 bset r5, r5, 0 ; I$ e !! 373 #ifdef __STDC__
>> 374 #define L(name) .L##name
>> 375 #else
>> 376 #define L(name) .L/**/name
>> 377 #endif
>> 378 #endif
>> 379
>> 380 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
>> 381 #ifndef __INITDATA
>> 382 #define __INITDATA .data
>> 383 #define __FINIT .previous
>> 384 #endif
>> 385
>> 386 /* Several macros to make the writing of subroutines easier:
>> 387 * - func_start marks the beginning of the routine which setups the frame
>> 388 * register and saves the registers, it also defines another macro
>> 389 * to automatically restore the registers again.
>> 390 * - func_return marks the end of the routine and simply calls the prepared
>> 391 * macro to restore registers and jump back to the caller.
>> 392 * - func_define generates another macro to automatically put arguments
>> 393 * onto the stack call the subroutine and cleanup the stack again.
>> 394 */
>> 395
>> 396 /* Within subroutines these macros can be used to access the arguments
>> 397 * on the stack. With STACK some allocated memory on the stack can be
>> 398 * accessed and ARG0 points to the return address (used by mmu_engage).
>> 399 */
>> 400 #define STACK %a6@(stackstart)
>> 401 #define ARG0 %a6@(4)
>> 402 #define ARG1 %a6@(8)
>> 403 #define ARG2 %a6@(12)
>> 404 #define ARG3 %a6@(16)
>> 405 #define ARG4 %a6@(20)
>> 406
>> 407 .macro func_start name,saveregs,stack=0
>> 408 L(\name):
>> 409 linkw %a6,#-\stack
>> 410 moveml \saveregs,%sp@-
>> 411 .set stackstart,-\stack
>> 412
>> 413 .macro func_return_\name
>> 414 moveml %sp@+,\saveregs
>> 415 unlk %a6
>> 416 rts
>> 417 .endm
>> 418 .endm
>> 419
>> 420 .macro func_return name
>> 421 func_return_\name
>> 422 .endm
>> 423
>> 424 .macro func_call name
>> 425 jbsr L(\name)
>> 426 .endm
>> 427
>> 428 .macro move_stack nr,arg1,arg2,arg3,arg4
>> 429 .if \nr
>> 430 move_stack "(\nr-1)",\arg2,\arg3,\arg4
>> 431 movel \arg1,%sp@-
>> 432 .endif
>> 433 .endm
>> 434
>> 435 .macro func_define name,nr=0
>> 436 .macro \name arg1,arg2,arg3,arg4
>> 437 move_stack \nr,\arg1,\arg2,\arg3,\arg4
>> 438 func_call \name
>> 439 .if \nr
>> 440 lea %sp@(\nr*4),%sp
>> 441 .endif
>> 442 .endm
>> 443 .endm
>> 444
>> 445 func_define mmu_map,4
>> 446 func_define mmu_map_tt,4
>> 447 func_define mmu_fixup_page_mmu_cache,1
>> 448 func_define mmu_temp_map,2
>> 449 func_define mmu_engage
>> 450 func_define mmu_get_root_table_entry,1
>> 451 func_define mmu_get_ptr_table_entry,2
>> 452 func_define mmu_get_page_table_entry,2
>> 453 func_define mmu_print
>> 454 func_define get_new_page
>> 455 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 456 func_define set_leds
33 #endif 457 #endif
34 sr r5, [ARC_REG_IC_CTRL] <<
35 458
>> 459 .macro mmu_map_eq arg1,arg2,arg3
>> 460 mmu_map \arg1,\arg1,\arg2,\arg3
>> 461 .endm
>> 462
>> 463 .macro get_bi_record record
>> 464 pea \record
>> 465 func_call get_bi_record
>> 466 addql #4,%sp
>> 467 .endm
>> 468
>> 469 func_define serial_putc,1
>> 470 func_define console_putc,1
>> 471
>> 472 func_define console_init
>> 473 func_define console_put_penguin
>> 474 func_define console_plot_pixel,3
>> 475 func_define console_scroll
>> 476
>> 477 .macro putc ch
>> 478 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 479 pea \ch
>> 480 #endif
>> 481 #ifdef CONSOLE_DEBUG
>> 482 func_call console_putc
>> 483 #endif
>> 484 #ifdef SERIAL_DEBUG
>> 485 func_call serial_putc
>> 486 #endif
>> 487 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 488 addql #4,%sp
>> 489 #endif
>> 490 .endm
>> 491
>> 492 .macro dputc ch
>> 493 #ifdef DEBUG
>> 494 putc \ch
>> 495 #endif
>> 496 .endm
>> 497
>> 498 func_define putn,1
>> 499
>> 500 .macro dputn nr
>> 501 #ifdef DEBUG
>> 502 putn \nr
>> 503 #endif
>> 504 .endm
>> 505
>> 506 .macro puts string
>> 507 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 508 __INITDATA
>> 509 .Lstr\@:
>> 510 .string "\string"
>> 511 __FINIT
>> 512 pea %pc@(.Lstr\@)
>> 513 func_call puts
>> 514 addql #4,%sp
>> 515 #endif
>> 516 .endm
>> 517
>> 518 .macro dputs string
>> 519 #ifdef DEBUG
>> 520 puts "\string"
>> 521 #endif
>> 522 .endm
>> 523
>> 524 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
>> 525 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
>> 526 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
>> 527 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
>> 528 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
>> 529 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
>> 530 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
>> 531 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
>> 532 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
>> 533 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
>> 534 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
>> 535 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
>> 536 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
>> 537
>> 538 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
>> 539 jeq 42f; \
>> 540 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
>> 541 jne lab ;\
>> 542 42:\
>> 543
>> 544 #define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
>> 545 #define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
>> 546 #define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
>> 547 #define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
>> 548 #define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
>> 549 #define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
>> 550 #define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
>> 551
>> 552 /* On the HP300 we use the on-board LEDs for debug output before
>> 553 the console is running. Writing a 1 bit turns the corresponding LED
>> 554 _off_ - on the 340 bit 7 is towards the back panel of the machine. */
>> 555 .macro leds mask
>> 556 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 557 hasnt_leds(.Lled\@)
>> 558 pea \mask
>> 559 func_call set_leds
>> 560 addql #4,%sp
>> 561 .Lled\@:
>> 562 #endif
>> 563 .endm
>> 564
>> 565 __HEAD
>> 566 ENTRY(_stext)
>> 567 /*
>> 568 * Version numbers of the bootinfo interface
>> 569 * The area from _stext to _start will later be used as kernel pointer table
>> 570 */
>> 571 bras 1f /* Jump over bootinfo version numbers */
>> 572
>> 573 .long BOOTINFOV_MAGIC
>> 574 .long MACH_AMIGA, AMIGA_BOOTI_VERSION
>> 575 .long MACH_ATARI, ATARI_BOOTI_VERSION
>> 576 .long MACH_MVME147, MVME147_BOOTI_VERSION
>> 577 .long MACH_MVME16x, MVME16x_BOOTI_VERSION
>> 578 .long MACH_BVME6000, BVME6000_BOOTI_VERSION
>> 579 .long MACH_MAC, MAC_BOOTI_VERSION
>> 580 .long MACH_Q40, Q40_BOOTI_VERSION
>> 581 .long MACH_HP300, HP300_BOOTI_VERSION
>> 582 .long 0
>> 583 1: jra __start
>> 584
>> 585 .equ kernel_pg_dir,_stext
>> 586
>> 587 .equ .,_stext+PAGESIZE
>> 588
>> 589 ENTRY(_start)
>> 590 jra __start
>> 591 __INIT
>> 592 ENTRY(__start)
>> 593 /*
>> 594 * Setup initial stack pointer
>> 595 */
>> 596 lea %pc@(_stext),%sp
>> 597
>> 598 /*
>> 599 * Record the CPU and machine type.
>> 600 */
>> 601 get_bi_record BI_MACHTYPE
>> 602 lea %pc@(m68k_machtype),%a1
>> 603 movel %a0@,%a1@
>> 604
>> 605 get_bi_record BI_FPUTYPE
>> 606 lea %pc@(m68k_fputype),%a1
>> 607 movel %a0@,%a1@
>> 608
>> 609 get_bi_record BI_MMUTYPE
>> 610 lea %pc@(m68k_mmutype),%a1
>> 611 movel %a0@,%a1@
>> 612
>> 613 get_bi_record BI_CPUTYPE
>> 614 lea %pc@(m68k_cputype),%a1
>> 615 movel %a0@,%a1@
>> 616
>> 617 leds 0x1
>> 618
>> 619 #ifdef CONFIG_MAC
>> 620 /*
>> 621 * For Macintosh, we need to determine the display parameters early (at least
>> 622 * while debugging it).
>> 623 */
>> 624
>> 625 is_not_mac(L(test_notmac))
>> 626
>> 627 get_bi_record BI_MAC_VADDR
>> 628 lea %pc@(L(mac_videobase)),%a1
>> 629 movel %a0@,%a1@
>> 630
>> 631 get_bi_record BI_MAC_VDEPTH
>> 632 lea %pc@(L(mac_videodepth)),%a1
>> 633 movel %a0@,%a1@
>> 634
>> 635 get_bi_record BI_MAC_VDIM
>> 636 lea %pc@(L(mac_dimensions)),%a1
>> 637 movel %a0@,%a1@
>> 638
>> 639 get_bi_record BI_MAC_VROW
>> 640 lea %pc@(L(mac_rowbytes)),%a1
>> 641 movel %a0@,%a1@
>> 642
>> 643 get_bi_record BI_MAC_SCCBASE
>> 644 lea %pc@(L(mac_sccbase)),%a1
>> 645 movel %a0@,%a1@
>> 646
>> 647 L(test_notmac):
>> 648 #endif /* CONFIG_MAC */
>> 649
>> 650
>> 651 /*
>> 652 * There are ultimately two pieces of information we want for all kinds of
>> 653 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter
>> 654 * and is converted here from a booter type definition to a separate bit
>> 655 * number which allows for the standard is_0x0 macro tests.
>> 656 */
>> 657 movel %pc@(m68k_cputype),%d0
>> 658 /*
>> 659 * Assume it's an 030
>> 660 */
>> 661 clrl %d1
>> 662
>> 663 /*
>> 664 * Test the BootInfo cputype for 060
>> 665 */
>> 666 btst #CPUB_68060,%d0
>> 667 jeq 1f
>> 668 bset #CPUTYPE_060,%d1
>> 669 bset #CPUTYPE_0460,%d1
>> 670 jra 3f
36 1: 671 1:
37 lr r5, [ARC_REG_DC_BCR] !! 672 /*
38 breq r5, 0, 1f ; D$ d !! 673 * Test the BootInfo cputype for 040
39 lr r5, [ARC_REG_DC_CTRL] !! 674 */
40 bclr r5, r5, 6 ; Inva !! 675 btst #CPUB_68040,%d0
41 #ifdef CONFIG_ARC_HAS_DCACHE !! 676 jeq 2f
42 bclr r5, r5, 0 ; Enab !! 677 bset #CPUTYPE_040,%d1
43 #else !! 678 bset #CPUTYPE_0460,%d1
44 bset r5, r5, 0 ; Disa !! 679 jra 3f
>> 680 2:
>> 681 /*
>> 682 * Test the BootInfo cputype for 020
>> 683 */
>> 684 btst #CPUB_68020,%d0
>> 685 jeq 3f
>> 686 bset #CPUTYPE_020,%d1
>> 687 jra 3f
>> 688 3:
>> 689 /*
>> 690 * Record the cpu type
>> 691 */
>> 692 lea %pc@(L(cputype)),%a0
>> 693 movel %d1,%a0@
>> 694
>> 695 /*
>> 696 * NOTE:
>> 697 *
>> 698 * Now the macros are valid:
>> 699 * is_040_or_060
>> 700 * is_not_040_or_060
>> 701 * is_040
>> 702 * is_060
>> 703 * is_not_060
>> 704 */
>> 705
>> 706 /*
>> 707 * Determine the cache mode for pages holding MMU tables
>> 708 * and for supervisor mode, unused for '020 and '030
>> 709 */
>> 710 clrl %d0
>> 711 clrl %d1
>> 712
>> 713 is_not_040_or_060(L(save_cachetype))
>> 714
>> 715 /*
>> 716 * '040 or '060
>> 717 * d1 := cacheable write-through
>> 718 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
>> 719 * but we have been using write-through since at least 2.0.29 so I
>> 720 * guess it is OK.
>> 721 */
>> 722 #ifdef CONFIG_060_WRITETHROUGH
>> 723 /*
>> 724 * If this is a 68060 board using drivers with cache coherency
>> 725 * problems, then supervisor memory accesses need to be write-through
>> 726 * also; otherwise, we want copyback.
>> 727 */
>> 728
>> 729 is_not_060(1f)
>> 730 movel #_PAGE_CACHE040W,%d0
>> 731 jra L(save_cachetype)
>> 732 #endif /* CONFIG_060_WRITETHROUGH */
>> 733 1:
>> 734 movew #_PAGE_CACHE040,%d0
>> 735
>> 736 movel #_PAGE_CACHE040W,%d1
>> 737
>> 738 L(save_cachetype):
>> 739 /* Save cache mode for supervisor mode and page tables
>> 740 */
>> 741 lea %pc@(m68k_supervisor_cachemode),%a0
>> 742 movel %d0,%a0@
>> 743 lea %pc@(m68k_pgtable_cachemode),%a0
>> 744 movel %d1,%a0@
>> 745
>> 746 /*
>> 747 * raise interrupt level
>> 748 */
>> 749 movew #0x2700,%sr
>> 750
>> 751 /*
>> 752 If running on an Atari, determine the I/O base of the
>> 753 serial port and test if we are running on a Medusa or Hades.
>> 754 This test is necessary here, because on the Hades the serial
>> 755 port is only accessible in the high I/O memory area.
>> 756
>> 757 The test whether it is a Medusa is done by writing to the byte at
>> 758 phys. 0x0. This should result in a bus error on all other machines.
>> 759
>> 760 ...should, but doesn't. The Afterburner040 for the Falcon has the
>> 761 same behaviour (0x0..0x7 are no ROM shadow). So we have to do
>> 762 another test to distinguish Medusa and AB040. This is a
>> 763 read attempt for 0x00ff82fe phys. that should bus error on a Falcon
>> 764 (+AB040), but is in the range where the Medusa always asserts DTACK.
>> 765
>> 766 The test for the Hades is done by reading address 0xb0000000. This
>> 767 should give a bus error on the Medusa.
>> 768 */
>> 769
>> 770 #ifdef CONFIG_ATARI
>> 771 is_not_atari(L(notypetest))
>> 772
>> 773 /* get special machine type (Medusa/Hades/AB40) */
>> 774 moveq #0,%d3 /* default if tag doesn't exist */
>> 775 get_bi_record BI_ATARI_MCH_TYPE
>> 776 tstl %d0
>> 777 jbmi 1f
>> 778 movel %a0@,%d3
>> 779 lea %pc@(atari_mch_type),%a0
>> 780 movel %d3,%a0@
>> 781 1:
>> 782 /* On the Hades, the iobase must be set up before opening the
>> 783 * serial port. There are no I/O regs at 0x00ffxxxx at all. */
>> 784 moveq #0,%d0
>> 785 cmpl #ATARI_MACH_HADES,%d3
>> 786 jbne 1f
>> 787 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */
>> 788 1: lea %pc@(L(iobase)),%a0
>> 789 movel %d0,%a0@
>> 790
>> 791 L(notypetest):
45 #endif 792 #endif
46 sr r5, [ARC_REG_DC_CTRL] <<
47 793
>> 794 #ifdef CONFIG_VME
>> 795 is_mvme147(L(getvmetype))
>> 796 is_bvme6000(L(getvmetype))
>> 797 is_not_mvme16x(L(gvtdone))
>> 798
>> 799 /* See if the loader has specified the BI_VME_TYPE tag. Recent
>> 800 * versions of VMELILO and TFTPLILO do this. We have to do this
>> 801 * early so we know how to handle console output. If the tag
>> 802 * doesn't exist then we use the Bug for output on MVME16x.
>> 803 */
>> 804 L(getvmetype):
>> 805 get_bi_record BI_VME_TYPE
>> 806 tstl %d0
>> 807 jbmi 1f
>> 808 movel %a0@,%d3
>> 809 lea %pc@(vme_brdtype),%a0
>> 810 movel %d3,%a0@
48 1: 811 1:
>> 812 #ifdef CONFIG_MVME16x
>> 813 is_not_mvme16x(L(gvtdone))
>> 814
>> 815 /* Need to get the BRD_ID info to differentiate between 162, 167,
>> 816 * etc. This is available as a BI_VME_BRDINFO tag with later
>> 817 * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
>> 818 */
>> 819 get_bi_record BI_VME_BRDINFO
>> 820 tstl %d0
>> 821 jpl 1f
>> 822
>> 823 /* Get pointer to board ID data from Bug */
>> 824 movel %d2,%sp@-
>> 825 trap #15
>> 826 .word 0x70 /* trap 0x70 - .BRD_ID */
>> 827 movel %sp@+,%a0
>> 828 1:
>> 829 lea %pc@(mvme_bdid),%a1
>> 830 /* Structure is 32 bytes long */
>> 831 movel %a0@+,%a1@+
>> 832 movel %a0@+,%a1@+
>> 833 movel %a0@+,%a1@+
>> 834 movel %a0@+,%a1@+
>> 835 movel %a0@+,%a1@+
>> 836 movel %a0@+,%a1@+
>> 837 movel %a0@+,%a1@+
>> 838 movel %a0@+,%a1@+
>> 839 #endif
>> 840
>> 841 L(gvtdone):
49 842
50 #ifdef CONFIG_ISA_ARCV2 <<
51 ; Unaligned access is disabled at rese <<
52 ; gcc 7.3.1 (ARC GNU 2018.03) onwards <<
53 ; by default <<
54 lr r5, [status32] <<
55 #ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS <<
56 bset r5, r5, STATUS_AD_BIT <<
57 #else <<
58 ; Although disabled at reset, bootload <<
59 bclr r5, r5, STATUS_AD_BIT <<
60 #endif 843 #endif
61 kflag r5 <<
62 844
63 #ifdef CONFIG_ARC_LPB_DISABLE !! 845 #ifdef CONFIG_HP300
64 lr r5, [ARC_REG_LPB_BUILD] !! 846 is_not_hp300(L(nothp))
65 breq r5, 0, 1f ; LPB !! 847
66 mov r5, 1 !! 848 /* Get the address of the UART for serial debugging */
67 sr r5, [ARC_REG_LPB_CTRL] !! 849 get_bi_record BI_HP300_UART_ADDR
>> 850 tstl %d0
>> 851 jbmi 1f
>> 852 movel %a0@,%d3
>> 853 lea %pc@(L(uartbase)),%a0
>> 854 movel %d3,%a0@
>> 855 get_bi_record BI_HP300_UART_SCODE
>> 856 tstl %d0
>> 857 jbmi 1f
>> 858 movel %a0@,%d3
>> 859 lea %pc@(L(uart_scode)),%a0
>> 860 movel %d3,%a0@
>> 861 1:
>> 862 L(nothp):
>> 863 #endif
>> 864
>> 865 /*
>> 866 * Initialize serial port
>> 867 */
>> 868 jbsr L(serial_init)
>> 869
>> 870 /*
>> 871 * Initialize console
>> 872 */
>> 873 #ifdef CONFIG_MAC
>> 874 is_not_mac(L(nocon))
>> 875 # ifdef CONSOLE_DEBUG
>> 876 console_init
>> 877 # ifdef CONFIG_LOGO
>> 878 console_put_penguin
>> 879 # endif /* CONFIG_LOGO */
>> 880 # endif /* CONSOLE_DEBUG */
>> 881 L(nocon):
>> 882 #endif /* CONFIG_MAC */
>> 883
>> 884
>> 885 putc '\n'
>> 886 putc 'A'
>> 887 leds 0x2
>> 888 dputn %pc@(L(cputype))
>> 889 dputn %pc@(m68k_supervisor_cachemode)
>> 890 dputn %pc@(m68k_pgtable_cachemode)
>> 891 dputc '\n'
>> 892
>> 893 /*
>> 894 * Save physical start address of kernel
>> 895 */
>> 896 lea %pc@(L(phys_kernel_start)),%a0
>> 897 lea %pc@(_stext),%a1
>> 898 subl #_stext,%a1
>> 899 addl #PAGE_OFFSET,%a1
>> 900 movel %a1,%a0@
>> 901
>> 902 putc 'B'
>> 903
>> 904 leds 0x4
>> 905
>> 906 /*
>> 907 * mmu_init
>> 908 *
>> 909 * This block of code does what's necessary to map in the various kinds
>> 910 * of machines for execution of Linux.
>> 911 * First map the first 4, 8, or 16 MB of kernel code & data
>> 912 */
>> 913
>> 914 get_bi_record BI_MEMCHUNK
>> 915 movel %a0@(4),%d0
>> 916 movel #16*1024*1024,%d1
>> 917 cmpl %d0,%d1
>> 918 jls 1f
>> 919 lsrl #1,%d1
>> 920 cmpl %d0,%d1
>> 921 jls 1f
>> 922 lsrl #1,%d1
68 1: 923 1:
69 #endif /* CONFIG_ARC_LPB_DISABLE */ !! 924 lea %pc@(m68k_init_mapped_size),%a0
>> 925 movel %d1,%a0@
>> 926 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),%d1,\
>> 927 %pc@(m68k_supervisor_cachemode)
>> 928
>> 929 putc 'C'
>> 930
>> 931 #ifdef CONFIG_AMIGA
>> 932
>> 933 L(mmu_init_amiga):
>> 934
>> 935 is_not_amiga(L(mmu_init_not_amiga))
>> 936 /*
>> 937 * mmu_init_amiga
>> 938 */
>> 939
>> 940 putc 'D'
>> 941
>> 942 is_not_040_or_060(1f)
>> 943
>> 944 /*
>> 945 * 040: Map the 16Meg range physical 0x0 up to logical 0x8000.0000
>> 946 */
>> 947 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 948 /*
>> 949 * Map the Zorro III I/O space with transparent translation
>> 950 * for frame buffer memory etc.
>> 951 */
>> 952 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
>> 953
>> 954 jbra L(mmu_init_done)
70 955
71 /* On HSDK, CCMs need to remapped supe <<
72 #ifdef CONFIG_ARC_SOC_HSDK <<
73 mov r6, 0x60000000 <<
74 lr r5, [ARC_REG_ICCM_BUILD] <<
75 breq r5, 0, 1f <<
76 sr r6, [ARC_REG_AUX_ICCM] <<
77 1: 956 1:
78 lr r5, [ARC_REG_DCCM_BUILD] !! 957 /*
79 breq r5, 0, 2f !! 958 * 030: Map the 32Meg range physical 0x0 up to logical 0x8000.0000
80 sr r6, [ARC_REG_AUX_DCCM] !! 959 */
>> 960 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 961 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
>> 962
>> 963 jbra L(mmu_init_done)
>> 964
>> 965 L(mmu_init_not_amiga):
>> 966 #endif
>> 967
>> 968 #ifdef CONFIG_ATARI
>> 969
>> 970 L(mmu_init_atari):
>> 971
>> 972 is_not_atari(L(mmu_init_not_atari))
>> 973
>> 974 putc 'E'
>> 975
>> 976 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
>> 977 the last 16 MB of virtual address space to the first 16 MB (i.e.
>> 978 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
>> 979 needed. I/O ranges are marked non-cachable.
>> 980
>> 981 For the Medusa it is better to map the I/O region transparently
>> 982 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
>> 983 accessible only in the high area.
>> 984
>> 985 On the Hades all I/O registers are only accessible in the high
>> 986 area.
>> 987 */
>> 988
>> 989 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
>> 990 moveq #0,%d0
>> 991 movel %pc@(atari_mch_type),%d3
>> 992 cmpl #ATARI_MACH_MEDUSA,%d3
>> 993 jbeq 2f
>> 994 cmpl #ATARI_MACH_HADES,%d3
>> 995 jbne 1f
>> 996 2: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
>> 997 1: movel %d0,%d3
>> 998
>> 999 is_040_or_060(L(spata68040))
>> 1000
>> 1001 /* Map everything non-cacheable, though not all parts really
>> 1002 * need to disable caches (crucial only for 0xff8000..0xffffff
>> 1003 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
>> 1004 * isn't really used, except for sometimes peeking into the
>> 1005 * ROMs (mirror at phys. 0x0), so caching isn't necessary for
>> 1006 * this. */
>> 1007 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
>> 1008
>> 1009 jbra L(mmu_init_done)
>> 1010
>> 1011 L(spata68040):
>> 1012
>> 1013 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
>> 1014
>> 1015 jbra L(mmu_init_done)
>> 1016
>> 1017 L(mmu_init_not_atari):
>> 1018 #endif
>> 1019
>> 1020 #ifdef CONFIG_Q40
>> 1021 is_not_q40(L(notq40))
>> 1022 /*
>> 1023 * add transparent mapping for 0xff00 0000 - 0xffff ffff
>> 1024 * non-cached serialized etc..
>> 1025 * this includes master chip, DAC, RTC and ISA ports
>> 1026 * 0xfe000000-0xfeffffff is for screen and ROM
>> 1027 */
>> 1028
>> 1029 putc 'Q'
>> 1030
>> 1031 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
>> 1032 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1033
>> 1034 jbra L(mmu_init_done)
>> 1035
>> 1036 L(notq40):
>> 1037 #endif
>> 1038
>> 1039 #ifdef CONFIG_HP300
>> 1040 is_not_hp300(L(nothp300))
>> 1041
>> 1042 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
>> 1043 * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx).
>> 1044 * The ROM mapping is needed because the LEDs are mapped there too.
>> 1045 */
>> 1046
>> 1047 is_040(1f)
>> 1048
>> 1049 /*
>> 1050 * 030: Map the 32Meg range physical 0x0 up to logical 0xf000.0000
>> 1051 */
>> 1052 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1053
>> 1054 jbra L(mmu_init_done)
>> 1055
>> 1056 1:
>> 1057 /*
>> 1058 * 040: Map the 16Meg range physical 0x0 up to logical 0xf000.0000
>> 1059 */
>> 1060 mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 1061
>> 1062 jbra L(mmu_init_done)
>> 1063
>> 1064 L(nothp300):
>> 1065 #endif /* CONFIG_HP300 */
>> 1066
>> 1067 #ifdef CONFIG_MVME147
>> 1068
>> 1069 is_not_mvme147(L(not147))
>> 1070
>> 1071 /*
>> 1072 * On MVME147 we have already created kernel page tables for
>> 1073 * 4MB of RAM at address 0, so now need to do a transparent
>> 1074 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1075 * so we can access on-board i/o areas.
>> 1076 */
>> 1077
>> 1078 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
>> 1079
>> 1080 jbra L(mmu_init_done)
>> 1081
>> 1082 L(not147):
>> 1083 #endif /* CONFIG_MVME147 */
>> 1084
>> 1085 #ifdef CONFIG_MVME16x
>> 1086
>> 1087 is_not_mvme16x(L(not16x))
>> 1088
>> 1089 /*
>> 1090 * On MVME16x we have already created kernel page tables for
>> 1091 * 4MB of RAM at address 0, so now need to do a transparent
>> 1092 * mapping of the top of memory space. Make it 0.5GByte for now.
>> 1093 * Supervisor only access, so transparent mapping doesn't
>> 1094 * clash with User code virtual address space.
>> 1095 * this covers IO devices, PROM and SRAM. The PROM and SRAM
>> 1096 * mapping is needed to allow 167Bug to run.
>> 1097 * IO is in the range 0xfff00000 to 0xfffeffff.
>> 1098 * PROM is 0xff800000->0xffbfffff and SRAM is
>> 1099 * 0xffe00000->0xffe1ffff.
>> 1100 */
>> 1101
>> 1102 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1103
>> 1104 jbra L(mmu_init_done)
>> 1105
>> 1106 L(not16x):
>> 1107 #endif /* CONFIG_MVME162 | CONFIG_MVME167 */
>> 1108
>> 1109 #ifdef CONFIG_BVME6000
>> 1110
>> 1111 is_not_bvme6000(L(not6000))
>> 1112
>> 1113 /*
>> 1114 * On BVME6000 we have already created kernel page tables for
>> 1115 * 4MB of RAM at address 0, so now need to do a transparent
>> 1116 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1117 * so we can access on-board i/o areas.
>> 1118 * Supervisor only access, so transparent mapping doesn't
>> 1119 * clash with User code virtual address space.
>> 1120 */
>> 1121
>> 1122 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1123
>> 1124 jbra L(mmu_init_done)
>> 1125
>> 1126 L(not6000):
>> 1127 #endif /* CONFIG_BVME6000 */
>> 1128
>> 1129 /*
>> 1130 * mmu_init_mac
>> 1131 *
>> 1132 * The Macintosh mappings are less clear.
>> 1133 *
>> 1134 * Even as of this writing, it is unclear how the
>> 1135 * Macintosh mappings will be done. However, as
>> 1136 * the first author of this code I'm proposing the
>> 1137 * following model:
>> 1138 *
>> 1139 * Map the kernel (that's already done),
>> 1140 * Map the I/O (on most machines that's the
>> 1141 * 0x5000.0000 ... 0x5300.0000 range,
>> 1142 * Map the video frame buffer using as few pages
>> 1143 * as absolutely (this requirement mostly stems from
>> 1144 * the fact that when the frame buffer is at
>> 1145 * 0x0000.0000 then we know there is valid RAM just
>> 1146 * above the screen that we don't want to waste!).
>> 1147 *
>> 1148 * By the way, if the frame buffer is at 0x0000.0000
>> 1149 * then the Macintosh is known as an RBV based Mac.
>> 1150 *
>> 1151 * By the way 2, the code currently maps in a bunch of
>> 1152 * regions. But I'd like to cut that out. (And move most
>> 1153 * of the mappings up into the kernel proper ... or only
>> 1154 * map what's necessary.)
>> 1155 */
>> 1156
>> 1157 #ifdef CONFIG_MAC
>> 1158
>> 1159 L(mmu_init_mac):
>> 1160
>> 1161 is_not_mac(L(mmu_init_not_mac))
>> 1162
>> 1163 putc 'F'
>> 1164
>> 1165 is_not_040_or_060(1f)
>> 1166
>> 1167 moveq #_PAGE_NOCACHE_S,%d3
>> 1168 jbra 2f
>> 1169 1:
>> 1170 moveq #_PAGE_NOCACHE030,%d3
81 2: 1171 2:
82 #endif /* CONFIG_ARC_SOC_HSDK */ !! 1172 /*
>> 1173 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
>> 1174 * we simply map the 4MB that contains the videomem
>> 1175 */
>> 1176
>> 1177 movel #VIDEOMEMMASK,%d0
>> 1178 andl %pc@(L(mac_videobase)),%d0
>> 1179
>> 1180 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
>> 1181 /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */
>> 1182 mmu_map_eq #0x40000000,#0x02000000,%d3
>> 1183 /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
>> 1184 mmu_map_eq #0x50000000,#0x03000000,%d3
>> 1185 /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
>> 1186 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3
83 1187
84 #endif /* CONFIG_ISA_ARCV2 */ !! 1188 jbra L(mmu_init_done)
85 1189
86 ; Config DSP_CTRL properly, so kernel !! 1190 L(mmu_init_not_mac):
87 ; multiply-accumulate, and divide oper !! 1191 #endif
88 DSP_EARLY_INIT <<
89 .endm <<
90 1192
91 .section .init.text, "ax",@progbits !! 1193 #ifdef CONFIG_SUN3X
>> 1194 is_not_sun3x(L(notsun3x))
92 1195
93 ;--------------------------------------------- !! 1196 /* oh, the pain.. We're gonna want the prom code after
94 ; Default Reset Handler (jumped into from Rese !! 1197 * starting the MMU, so we copy the mappings, translating
95 ; - Don't clobber r0,r1,r2 as they might have !! 1198 * from 8k -> 4k pages as we go.
96 ; - Platforms can override this weak version i !! 1199 */
97 ;--------------------------------------------- !! 1200
98 WEAK(res_service) !! 1201 /* copy maps from 0xfee00000 to 0xff000000 */
99 j stext !! 1202 movel #0xfee00000, %d0
100 END(res_service) !! 1203 moveq #ROOT_INDEX_SHIFT, %d1
>> 1204 lsrl %d1,%d0
>> 1205 mmu_get_root_table_entry %d0
>> 1206
>> 1207 movel #0xfee00000, %d0
>> 1208 moveq #PTR_INDEX_SHIFT, %d1
>> 1209 lsrl %d1,%d0
>> 1210 andl #PTR_TABLE_SIZE-1, %d0
>> 1211 mmu_get_ptr_table_entry %a0,%d0
>> 1212
>> 1213 movel #0xfee00000, %d0
>> 1214 moveq #PAGE_INDEX_SHIFT, %d1
>> 1215 lsrl %d1,%d0
>> 1216 andl #PAGE_TABLE_SIZE-1, %d0
>> 1217 mmu_get_page_table_entry %a0,%d0
>> 1218
>> 1219 /* this is where the prom page table lives */
>> 1220 movel 0xfefe00d4, %a1
>> 1221 movel %a1@, %a1
101 1222
102 ;--------------------------------------------- !! 1223 movel #((0x200000 >> 13)-1), %d1
103 ; Kernel Entry point <<
104 ;--------------------------------------------- <<
105 ENTRY(stext) <<
106 1224
107 CPU_EARLY_SETUP !! 1225 1:
>> 1226 movel %a1@+, %d3
>> 1227 movel %d3,%a0@+
>> 1228 addl #0x1000,%d3
>> 1229 movel %d3,%a0@+
>> 1230
>> 1231 dbra %d1,1b
>> 1232
>> 1233 /* setup tt1 for I/O */
>> 1234 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
>> 1235 jbra L(mmu_init_done)
108 1236
109 #ifdef CONFIG_SMP !! 1237 L(notsun3x):
110 GET_CPU_ID r5 !! 1238 #endif
111 cmp r5, 0 !! 1239
112 mov.nz r0, r5 !! 1240 #ifdef CONFIG_APOLLO
113 bz .Lmaster_proceed !! 1241 is_not_apollo(L(notapollo))
>> 1242
>> 1243 putc 'P'
>> 1244 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1245
>> 1246 L(notapollo):
>> 1247 jbra L(mmu_init_done)
>> 1248 #endif
>> 1249
>> 1250 L(mmu_init_done):
>> 1251
>> 1252 putc 'G'
>> 1253 leds 0x8
>> 1254
>> 1255 /*
>> 1256 * mmu_fixup
>> 1257 *
>> 1258 * On the 040 class machines, all pages that are used for the
>> 1259 * mmu have to be fixed up. According to Motorola, pages holding mmu
>> 1260 * tables should be non-cacheable on a '040 and write-through on a
>> 1261 * '060. But analysis of the reasons for this, and practical
>> 1262 * experience, showed that write-through also works on a '040.
>> 1263 *
>> 1264 * Allocated memory so far goes from kernel_end to memory_start that
>> 1265 * is used for all kind of tables, for that the cache attributes
>> 1266 * are now fixed.
>> 1267 */
>> 1268 L(mmu_fixup):
114 1269
115 ; Non-Masters wait for Master to boot !! 1270 is_not_040_or_060(L(mmu_fixup_done))
116 ; when they resume, tail-call to entry <<
117 mov blink, @first_lines_of_seconda <<
118 j arc_platform_smp_wait_to_boot <<
119 1271
120 .Lmaster_proceed: !! 1272 #ifdef MMU_NOCACHE_KERNEL
>> 1273 jbra L(mmu_fixup_done)
121 #endif 1274 #endif
122 1275
123 ; Clear BSS before updating any global !! 1276 /* first fix the page at the start of the kernel, that
124 ; XXX: use ZOL here !! 1277 * contains also kernel_pg_dir.
125 mov r5, __bss_start !! 1278 */
126 sub r6, __bss_stop, r5 !! 1279 movel %pc@(L(phys_kernel_start)),%d0
127 lsr.f lp_count, r6, 2 !! 1280 subl #PAGE_OFFSET,%d0
128 lpnz 1f !! 1281 lea %pc@(_stext),%a0
129 st.ab 0, [r5, 4] !! 1282 subl %d0,%a0
>> 1283 mmu_fixup_page_mmu_cache %a0
>> 1284
>> 1285 movel %pc@(L(kernel_end)),%a0
>> 1286 subl %d0,%a0
>> 1287 movel %pc@(L(memory_start)),%a1
>> 1288 subl %d0,%a1
>> 1289 bra 2f
130 1: 1290 1:
>> 1291 mmu_fixup_page_mmu_cache %a0
>> 1292 addw #PAGESIZE,%a0
>> 1293 2:
>> 1294 cmpl %a0,%a1
>> 1295 jgt 1b
131 1296
132 ; Uboot - kernel ABI !! 1297 L(mmu_fixup_done):
133 ; r0 = [0] No uboot interaction, [1 <<
134 ; r1 = magic number (always zero as <<
135 ; r2 = pointer to uboot provided cm <<
136 ; These are handled later in handle_ub <<
137 st r0, [@uboot_tag] <<
138 st r1, [@uboot_magic] <<
139 st r2, [@uboot_arg] <<
140 1298
141 ; setup "current" tsk and optionally c !! 1299 #ifdef MMU_PRINT
142 mov r9, @init_task !! 1300 mmu_print
143 SET_CURR_TASK_ON_CPU r9, r0 ; r9 = !! 1301 #endif
144 1302
145 ; setup stack (fp, sp) !! 1303 /*
146 mov fp, 0 !! 1304 * mmu_engage
>> 1305 *
>> 1306 * This chunk of code performs the gruesome task of engaging the MMU.
>> 1307 * The reason its gruesome is because when the MMU becomes engaged it
>> 1308 * maps logical addresses to physical addresses. The Program Counter
>> 1309 * register is then passed through the MMU before the next instruction
>> 1310 * is fetched (the instruction following the engage MMU instruction).
>> 1311 * This may mean one of two things:
>> 1312 * 1. The Program Counter falls within the logical address space of
>> 1313 * the kernel of which there are two sub-possibilities:
>> 1314 * A. The PC maps to the correct instruction (logical PC == physical
>> 1315 * code location), or
>> 1316 * B. The PC does not map through and the processor will read some
>> 1317 * data (or instruction) which is not the logically next instr.
>> 1318 * As you can imagine, A is good and B is bad.
>> 1319 * Alternatively,
>> 1320 * 2. The Program Counter does not map through the MMU. The processor
>> 1321 * will take a Bus Error.
>> 1322 * Clearly, 2 is bad.
>> 1323 * It doesn't take a wiz kid to figure you want 1.A.
>> 1324 * This code creates that possibility.
>> 1325 * There are two possible 1.A. states (we now ignore the other above states):
>> 1326 * A. The kernel is located at physical memory addressed the same as
>> 1327 * the logical memory for the kernel, i.e., 0x01000.
>> 1328 * B. The kernel is located some where else. e.g., 0x0400.0000
>> 1329 *
>> 1330 * Under some conditions the Macintosh can look like A or B.
>> 1331 * [A friend and I once noted that Apple hardware engineers should be
>> 1332 * wacked twice each day: once when they show up at work (as in, Whack!,
>> 1333 * "This is for the screwy hardware we know you're going to design today."),
>> 1334 * and also at the end of the day (as in, Whack! "I don't know what
>> 1335 * you designed today, but I'm sure it wasn't good."). -- rst]
>> 1336 *
>> 1337 * This code works on the following premise:
>> 1338 * If the kernel start (%d5) is within the first 16 Meg of RAM,
>> 1339 * then create a mapping for the kernel at logical 0x8000.0000 to
>> 1340 * the physical location of the pc. And, create a transparent
>> 1341 * translation register for the first 16 Meg. Then, after the MMU
>> 1342 * is engaged, the PC can be moved up into the 0x8000.0000 range
>> 1343 * and then the transparent translation can be turned off and then
>> 1344 * the PC can jump to the correct logical location and it will be
>> 1345 * home (finally). This is essentially the code that the Amiga used
>> 1346 * to use. Now, it's generalized for all processors. Which means
>> 1347 * that a fresh (but temporary) mapping has to be created. The mapping
>> 1348 * is made in page 0 (an as of yet unused location -- except for the
>> 1349 * stack!). This temporary mapping will only require 1 pointer table
>> 1350 * and a single page table (it can map 256K).
>> 1351 *
>> 1352 * OK, alternatively, imagine that the Program Counter is not within
>> 1353 * the first 16 Meg. Then, just use Transparent Translation registers
>> 1354 * to do the right thing.
>> 1355 *
>> 1356 * Last, if _start is already at 0x01000, then there's nothing special
>> 1357 * to do (in other words, in a degenerate case of the first case above,
>> 1358 * do nothing).
>> 1359 *
>> 1360 * Let's do it.
>> 1361 *
>> 1362 *
>> 1363 */
147 1364
148 ; tsk->thread_info is really a PAGE, w !! 1365 putc 'H'
149 GET_TSK_STACK_BASE r9, sp ; r9 = <<
150 1366
151 j start_kernel ; "C" entry po !! 1367 mmu_engage
152 END(stext) <<
153 1368
154 #ifdef CONFIG_SMP !! 1369 /*
155 ;--------------------------------------------- !! 1370 * After this point no new memory is allocated and
156 ; First lines of code run by secondary bef !! 1371 * the start of available memory is stored in availmem.
157 ;--------------------------------------------- !! 1372 * (The bootmem allocator requires now the physicall address.)
158 .section .text, "ax",@progbits !! 1373 */
159 ENTRY(first_lines_of_secondary) <<
160 1374
161 ; setup per-cpu idle task as "current" !! 1375 movel L(memory_start),availmem
162 ld r0, [@secondary_idle_tsk] <<
163 SET_CURR_TASK_ON_CPU r0, r1 <<
164 1376
165 ; setup stack (fp, sp) !! 1377 #ifdef CONFIG_AMIGA
166 mov fp, 0 !! 1378 is_not_amiga(1f)
>> 1379 /* fixup the Amiga custom register location before printing */
>> 1380 clrl L(custom)
>> 1381 1:
>> 1382 #endif
167 1383
168 ; set its stack base to tsk->thread_in !! 1384 #ifdef CONFIG_ATARI
169 GET_TSK_STACK_BASE r0, sp !! 1385 is_not_atari(1f)
>> 1386 /* fixup the Atari iobase register location before printing */
>> 1387 movel #0xff000000,L(iobase)
>> 1388 1:
>> 1389 #endif
170 1390
171 j start_kernel_secondary !! 1391 #ifdef CONFIG_MAC
172 END(first_lines_of_secondary) !! 1392 is_not_mac(1f)
>> 1393 movel #~VIDEOMEMMASK,%d0
>> 1394 andl L(mac_videobase),%d0
>> 1395 addl #VIDEOMEMBASE,%d0
>> 1396 movel %d0,L(mac_videobase)
>> 1397 #ifdef CONSOLE_DEBUG
>> 1398 movel %pc@(L(phys_kernel_start)),%d0
>> 1399 subl #PAGE_OFFSET,%d0
>> 1400 subl %d0,L(console_font)
>> 1401 subl %d0,L(console_font_data)
>> 1402 #endif
>> 1403 orl #0x50000000,L(mac_sccbase)
>> 1404 1:
>> 1405 #endif
>> 1406
>> 1407 #ifdef CONFIG_HP300
>> 1408 is_not_hp300(2f)
>> 1409 /*
>> 1410 * Fix up the iobase register to point to the new location of the LEDs.
>> 1411 */
>> 1412 movel #0xf0000000,L(iobase)
>> 1413
>> 1414 /*
>> 1415 * Energise the FPU and caches.
>> 1416 */
>> 1417 is_040(1f)
>> 1418 movel #0x60,0xf05f400c
>> 1419 jbra 2f
>> 1420
>> 1421 /*
>> 1422 * 040: slightly different, apparently.
>> 1423 */
>> 1424 1: movew #0,0xf05f400e
>> 1425 movew #0x64,0xf05f400e
>> 1426 2:
>> 1427 #endif
>> 1428
>> 1429 #ifdef CONFIG_SUN3X
>> 1430 is_not_sun3x(1f)
>> 1431
>> 1432 /* enable copro */
>> 1433 oriw #0x4000,0x61000000
>> 1434 1:
>> 1435 #endif
>> 1436
>> 1437 #ifdef CONFIG_APOLLO
>> 1438 is_not_apollo(1f)
>> 1439
>> 1440 /*
>> 1441 * Fix up the iobase before printing
>> 1442 */
>> 1443 movel #0x80000000,L(iobase)
>> 1444 1:
>> 1445 #endif
>> 1446
>> 1447 putc 'I'
>> 1448 leds 0x10
>> 1449
>> 1450 /*
>> 1451 * Enable caches
>> 1452 */
>> 1453
>> 1454 is_not_040_or_060(L(cache_not_680460))
>> 1455
>> 1456 L(cache680460):
>> 1457 .chip 68040
>> 1458 nop
>> 1459 cpusha %bc
>> 1460 nop
>> 1461
>> 1462 is_060(L(cache68060))
>> 1463
>> 1464 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0
>> 1465 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1466 movec %d0,%cacr
>> 1467 jra L(cache_done)
>> 1468
>> 1469 L(cache68060):
>> 1470 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
>> 1471 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1472 movec %d0,%cacr
>> 1473 /* enable superscalar dispatch in PCR */
>> 1474 moveq #1,%d0
>> 1475 .chip 68060
>> 1476 movec %d0,%pcr
>> 1477
>> 1478 jbra L(cache_done)
>> 1479 L(cache_not_680460):
>> 1480 L(cache68030):
>> 1481 .chip 68030
>> 1482 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
>> 1483 movec %d0,%cacr
>> 1484
>> 1485 jra L(cache_done)
>> 1486 .chip 68k
>> 1487 L(cache_done):
>> 1488
>> 1489 putc 'J'
>> 1490
>> 1491 /*
>> 1492 * Setup initial stack pointer
>> 1493 */
>> 1494 lea init_task,%curptr
>> 1495 lea init_thread_union+THREAD_SIZE,%sp
>> 1496
>> 1497 putc 'K'
>> 1498
>> 1499 subl %a6,%a6 /* clear a6 for gdb */
>> 1500
>> 1501 /*
>> 1502 * The new 64bit printf support requires an early exception initialization.
>> 1503 */
>> 1504 jbsr base_trap_init
>> 1505
>> 1506 /* jump to the kernel start */
>> 1507
>> 1508 putc '\n'
>> 1509 leds 0x55
>> 1510
>> 1511 jbsr start_kernel
>> 1512
>> 1513 /*
>> 1514 * Find a tag record in the bootinfo structure
>> 1515 * The bootinfo structure is located right after the kernel
>> 1516 * Returns: d0: size (-1 if not found)
>> 1517 * a0: data pointer (end-of-records if not found)
>> 1518 */
>> 1519 func_start get_bi_record,%d1
>> 1520
>> 1521 movel ARG1,%d0
>> 1522 lea %pc@(_end),%a0
>> 1523 1: tstw %a0@(BIR_TAG)
>> 1524 jeq 3f
>> 1525 cmpw %a0@(BIR_TAG),%d0
>> 1526 jeq 2f
>> 1527 addw %a0@(BIR_SIZE),%a0
>> 1528 jra 1b
>> 1529 2: moveq #0,%d0
>> 1530 movew %a0@(BIR_SIZE),%d0
>> 1531 lea %a0@(BIR_DATA),%a0
>> 1532 jra 4f
>> 1533 3: moveq #-1,%d0
>> 1534 lea %a0@(BIR_SIZE),%a0
>> 1535 4:
>> 1536 func_return get_bi_record
>> 1537
>> 1538
>> 1539 /*
>> 1540 * MMU Initialization Begins Here
>> 1541 *
>> 1542 * The structure of the MMU tables on the 68k machines
>> 1543 * is thus:
>> 1544 * Root Table
>> 1545 * Logical addresses are translated through
>> 1546 * a hierarchical translation mechanism where the high-order
>> 1547 * seven bits of the logical address (LA) are used as an
>> 1548 * index into the "root table." Each entry in the root
>> 1549 * table has a bit which specifies if it's a valid pointer to a
>> 1550 * pointer table. Each entry defines a 32KMeg range of memory.
>> 1551 * If an entry is invalid then that logical range of 32M is
>> 1552 * invalid and references to that range of memory (when the MMU
>> 1553 * is enabled) will fault. If the entry is valid, then it does
>> 1554 * one of two things. On 040/060 class machines, it points to
>> 1555 * a pointer table which then describes more finely the memory
>> 1556 * within that 32M range. On 020/030 class machines, a technique
>> 1557 * called "early terminating descriptors" are used. This technique
>> 1558 * allows an entire 32Meg to be described by a single entry in the
>> 1559 * root table. Thus, this entry in the root table, contains the
>> 1560 * physical address of the memory or I/O at the logical address
>> 1561 * which the entry represents and it also contains the necessary
>> 1562 * cache bits for this region.
>> 1563 *
>> 1564 * Pointer Tables
>> 1565 * Per the Root Table, there will be one or more
>> 1566 * pointer tables. Each pointer table defines a 32M range.
>> 1567 * Not all of the 32M range need be defined. Again, the next
>> 1568 * seven bits of the logical address are used an index into
>> 1569 * the pointer table to point to page tables (if the pointer
>> 1570 * is valid). There will undoubtedly be more than one
>> 1571 * pointer table for the kernel because each pointer table
>> 1572 * defines a range of only 32M. Valid pointer table entries
>> 1573 * point to page tables, or are early terminating entries
>> 1574 * themselves.
>> 1575 *
>> 1576 * Page Tables
>> 1577 * Per the Pointer Tables, each page table entry points
>> 1578 * to the physical page in memory that supports the logical
>> 1579 * address that translates to the particular index.
>> 1580 *
>> 1581 * In short, the Logical Address gets translated as follows:
>> 1582 * bits 31..26 - index into the Root Table
>> 1583 * bits 25..18 - index into the Pointer Table
>> 1584 * bits 17..12 - index into the Page Table
>> 1585 * bits 11..0 - offset into a particular 4K page
>> 1586 *
>> 1587 * The algorithms which follows do one thing: they abstract
>> 1588 * the MMU hardware. For example, there are three kinds of
>> 1589 * cache settings that are relevant. Either, memory is
>> 1590 * being mapped in which case it is either Kernel Code (or
>> 1591 * the RamDisk) or it is MMU data. On the 030, the MMU data
>> 1592 * option also describes the kernel. Or, I/O is being mapped
>> 1593 * in which case it has its own kind of cache bits. There
>> 1594 * are constants which abstract these notions from the code that
>> 1595 * actually makes the call to map some range of memory.
>> 1596 *
>> 1597 *
>> 1598 *
>> 1599 */
>> 1600
>> 1601 #ifdef MMU_PRINT
>> 1602 /*
>> 1603 * mmu_print
>> 1604 *
>> 1605 * This algorithm will print out the current MMU mappings.
>> 1606 *
>> 1607 * Input:
>> 1608 * %a5 points to the root table. Everything else is calculated
>> 1609 * from this.
>> 1610 */
>> 1611
>> 1612 #define mmu_next_valid 0
>> 1613 #define mmu_start_logical 4
>> 1614 #define mmu_next_logical 8
>> 1615 #define mmu_start_physical 12
>> 1616 #define mmu_next_physical 16
>> 1617
>> 1618 #define MMU_PRINT_INVALID -1
>> 1619 #define MMU_PRINT_VALID 1
>> 1620 #define MMU_PRINT_UNINITED 0
>> 1621
>> 1622 #define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2:
>> 1623
>> 1624 func_start mmu_print,%a0-%a6/%d0-%d7
>> 1625
>> 1626 movel %pc@(L(kernel_pgdir_ptr)),%a5
>> 1627 lea %pc@(L(mmu_print_data)),%a0
>> 1628 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
>> 1629
>> 1630 is_not_040_or_060(mmu_030_print)
>> 1631
>> 1632 mmu_040_print:
>> 1633 puts "\nMMU040\n"
>> 1634 puts "rp:"
>> 1635 putn %a5
>> 1636 putc '\n'
>> 1637 #if 0
>> 1638 /*
>> 1639 * The following #if/#endif block is a tight algorithm for dumping the 040
>> 1640 * MMU Map in gory detail. It really isn't that practical unless the
>> 1641 * MMU Map algorithm appears to go awry and you need to debug it at the
>> 1642 * entry per entry level.
>> 1643 */
>> 1644 movel #ROOT_TABLE_SIZE,%d5
>> 1645 #if 0
>> 1646 movel %a5@+,%d7 | Burn an entry to skip the kernel mappings,
>> 1647 subql #1,%d5 | they (might) work
>> 1648 #endif
>> 1649 1: tstl %d5
>> 1650 jbeq mmu_print_done
>> 1651 subq #1,%d5
>> 1652 movel %a5@+,%d7
>> 1653 btst #1,%d7
>> 1654 jbeq 1b
>> 1655
>> 1656 2: putn %d7
>> 1657 andil #0xFFFFFE00,%d7
>> 1658 movel %d7,%a4
>> 1659 movel #PTR_TABLE_SIZE,%d4
>> 1660 putc ' '
>> 1661 3: tstl %d4
>> 1662 jbeq 11f
>> 1663 subq #1,%d4
>> 1664 movel %a4@+,%d7
>> 1665 btst #1,%d7
>> 1666 jbeq 3b
>> 1667
>> 1668 4: putn %d7
>> 1669 andil #0xFFFFFF00,%d7
>> 1670 movel %d7,%a3
>> 1671 movel #PAGE_TABLE_SIZE,%d3
>> 1672 5: movel #8,%d2
>> 1673 6: tstl %d3
>> 1674 jbeq 31f
>> 1675 subq #1,%d3
>> 1676 movel %a3@+,%d6
>> 1677 btst #0,%d6
>> 1678 jbeq 6b
>> 1679 7: tstl %d2
>> 1680 jbeq 8f
>> 1681 subq #1,%d2
>> 1682 putc ' '
>> 1683 jbra 91f
>> 1684 8: putc '\n'
>> 1685 movel #8+1+8+1+1,%d2
>> 1686 9: putc ' '
>> 1687 dbra %d2,9b
>> 1688 movel #7,%d2
>> 1689 91: putn %d6
>> 1690 jbra 6b
>> 1691
>> 1692 31: putc '\n'
>> 1693 movel #8+1,%d2
>> 1694 32: putc ' '
>> 1695 dbra %d2,32b
>> 1696 jbra 3b
>> 1697
>> 1698 11: putc '\n'
>> 1699 jbra 1b
>> 1700 #endif /* MMU 040 Dumping code that's gory and detailed */
>> 1701
>> 1702 lea %pc@(kernel_pg_dir),%a5
>> 1703 movel %a5,%a0 /* a0 has the address of the root table ptr */
>> 1704 movel #0x00000000,%a4 /* logical address */
>> 1705 moveql #0,%d0
>> 1706 40:
>> 1707 /* Increment the logical address and preserve in d5 */
>> 1708 movel %a4,%d5
>> 1709 addil #PAGESIZE<<13,%d5
>> 1710 movel %a0@+,%d6
>> 1711 btst #1,%d6
>> 1712 jbne 41f
>> 1713 jbsr mmu_print_tuple_invalidate
>> 1714 jbra 48f
>> 1715 41:
>> 1716 movel #0,%d1
>> 1717 andil #0xfffffe00,%d6
>> 1718 movel %d6,%a1
>> 1719 42:
>> 1720 movel %a4,%d5
>> 1721 addil #PAGESIZE<<6,%d5
>> 1722 movel %a1@+,%d6
>> 1723 btst #1,%d6
>> 1724 jbne 43f
>> 1725 jbsr mmu_print_tuple_invalidate
>> 1726 jbra 47f
>> 1727 43:
>> 1728 movel #0,%d2
>> 1729 andil #0xffffff00,%d6
>> 1730 movel %d6,%a2
>> 1731 44:
>> 1732 movel %a4,%d5
>> 1733 addil #PAGESIZE,%d5
>> 1734 movel %a2@+,%d6
>> 1735 btst #0,%d6
>> 1736 jbne 45f
>> 1737 jbsr mmu_print_tuple_invalidate
>> 1738 jbra 46f
>> 1739 45:
>> 1740 moveml %d0-%d1,%sp@-
>> 1741 movel %a4,%d0
>> 1742 movel %d6,%d1
>> 1743 andil #0xfffff4e0,%d1
>> 1744 lea %pc@(mmu_040_print_flags),%a6
>> 1745 jbsr mmu_print_tuple
>> 1746 moveml %sp@+,%d0-%d1
>> 1747 46:
>> 1748 movel %d5,%a4
>> 1749 addq #1,%d2
>> 1750 cmpib #64,%d2
>> 1751 jbne 44b
>> 1752 47:
>> 1753 movel %d5,%a4
>> 1754 addq #1,%d1
>> 1755 cmpib #128,%d1
>> 1756 jbne 42b
>> 1757 48:
>> 1758 movel %d5,%a4 /* move to the next logical address */
>> 1759 addq #1,%d0
>> 1760 cmpib #128,%d0
>> 1761 jbne 40b
>> 1762
>> 1763 .chip 68040
>> 1764 movec %dtt1,%d0
>> 1765 movel %d0,%d1
>> 1766 andiw #0x8000,%d1 /* is it valid ? */
>> 1767 jbeq 1f /* No, bail out */
>> 1768
>> 1769 movel %d0,%d1
>> 1770 andil #0xff000000,%d1 /* Get the address */
>> 1771 putn %d1
>> 1772 puts "=="
>> 1773 putn %d1
>> 1774
>> 1775 movel %d0,%d6
>> 1776 jbsr mmu_040_print_flags_tt
>> 1777 1:
>> 1778 movec %dtt0,%d0
>> 1779 movel %d0,%d1
>> 1780 andiw #0x8000,%d1 /* is it valid ? */
>> 1781 jbeq 1f /* No, bail out */
>> 1782
>> 1783 movel %d0,%d1
>> 1784 andil #0xff000000,%d1 /* Get the address */
>> 1785 putn %d1
>> 1786 puts "=="
>> 1787 putn %d1
>> 1788
>> 1789 movel %d0,%d6
>> 1790 jbsr mmu_040_print_flags_tt
>> 1791 1:
>> 1792 .chip 68k
>> 1793
>> 1794 jbra mmu_print_done
>> 1795
>> 1796 mmu_040_print_flags:
>> 1797 btstl #10,%d6
>> 1798 putZc(' ','G') /* global bit */
>> 1799 btstl #7,%d6
>> 1800 putZc(' ','S') /* supervisor bit */
>> 1801 mmu_040_print_flags_tt:
>> 1802 btstl #6,%d6
>> 1803 jbne 3f
>> 1804 putc 'C'
>> 1805 btstl #5,%d6
>> 1806 putZc('w','c') /* write through or copy-back */
>> 1807 jbra 4f
>> 1808 3:
>> 1809 putc 'N'
>> 1810 btstl #5,%d6
>> 1811 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */
>> 1812 4:
>> 1813 rts
>> 1814
>> 1815 mmu_030_print_flags:
>> 1816 btstl #6,%d6
>> 1817 putZc('C','I') /* write through or copy-back */
>> 1818 rts
>> 1819
>> 1820 mmu_030_print:
>> 1821 puts "\nMMU030\n"
>> 1822 puts "\nrp:"
>> 1823 putn %a5
>> 1824 putc '\n'
>> 1825 movel %a5,%d0
>> 1826 andil #0xfffffff0,%d0
>> 1827 movel %d0,%a0
>> 1828 movel #0x00000000,%a4 /* logical address */
>> 1829 movel #0,%d0
>> 1830 30:
>> 1831 movel %a4,%d5
>> 1832 addil #PAGESIZE<<13,%d5
>> 1833 movel %a0@+,%d6
>> 1834 btst #1,%d6 /* is it a table ptr? */
>> 1835 jbne 31f /* yes */
>> 1836 btst #0,%d6 /* is it early terminating? */
>> 1837 jbeq 1f /* no */
>> 1838 jbsr mmu_030_print_helper
>> 1839 jbra 38f
>> 1840 1:
>> 1841 jbsr mmu_print_tuple_invalidate
>> 1842 jbra 38f
>> 1843 31:
>> 1844 movel #0,%d1
>> 1845 andil #0xfffffff0,%d6
>> 1846 movel %d6,%a1
>> 1847 32:
>> 1848 movel %a4,%d5
>> 1849 addil #PAGESIZE<<6,%d5
>> 1850 movel %a1@+,%d6
>> 1851 btst #1,%d6 /* is it a table ptr? */
>> 1852 jbne 33f /* yes */
>> 1853 btst #0,%d6 /* is it a page descriptor? */
>> 1854 jbeq 1f /* no */
>> 1855 jbsr mmu_030_print_helper
>> 1856 jbra 37f
>> 1857 1:
>> 1858 jbsr mmu_print_tuple_invalidate
>> 1859 jbra 37f
>> 1860 33:
>> 1861 movel #0,%d2
>> 1862 andil #0xfffffff0,%d6
>> 1863 movel %d6,%a2
>> 1864 34:
>> 1865 movel %a4,%d5
>> 1866 addil #PAGESIZE,%d5
>> 1867 movel %a2@+,%d6
>> 1868 btst #0,%d6
>> 1869 jbne 35f
>> 1870 jbsr mmu_print_tuple_invalidate
>> 1871 jbra 36f
>> 1872 35:
>> 1873 jbsr mmu_030_print_helper
>> 1874 36:
>> 1875 movel %d5,%a4
>> 1876 addq #1,%d2
>> 1877 cmpib #64,%d2
>> 1878 jbne 34b
>> 1879 37:
>> 1880 movel %d5,%a4
>> 1881 addq #1,%d1
>> 1882 cmpib #128,%d1
>> 1883 jbne 32b
>> 1884 38:
>> 1885 movel %d5,%a4 /* move to the next logical address */
>> 1886 addq #1,%d0
>> 1887 cmpib #128,%d0
>> 1888 jbne 30b
>> 1889
>> 1890 mmu_print_done:
>> 1891 puts "\n"
>> 1892
>> 1893 func_return mmu_print
>> 1894
>> 1895
>> 1896 mmu_030_print_helper:
>> 1897 moveml %d0-%d1,%sp@-
>> 1898 movel %a4,%d0
>> 1899 movel %d6,%d1
>> 1900 lea %pc@(mmu_030_print_flags),%a6
>> 1901 jbsr mmu_print_tuple
>> 1902 moveml %sp@+,%d0-%d1
>> 1903 rts
>> 1904
>> 1905 mmu_print_tuple_invalidate:
>> 1906 moveml %a0/%d7,%sp@-
>> 1907
>> 1908 lea %pc@(L(mmu_print_data)),%a0
>> 1909 tstl %a0@(mmu_next_valid)
>> 1910 jbmi mmu_print_tuple_invalidate_exit
>> 1911
>> 1912 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
>> 1913
>> 1914 putn %a4
>> 1915
>> 1916 puts "##\n"
>> 1917
>> 1918 mmu_print_tuple_invalidate_exit:
>> 1919 moveml %sp@+,%a0/%d7
>> 1920 rts
>> 1921
>> 1922
>> 1923 mmu_print_tuple:
>> 1924 moveml %d0-%d7/%a0,%sp@-
>> 1925
>> 1926 lea %pc@(L(mmu_print_data)),%a0
>> 1927
>> 1928 tstl %a0@(mmu_next_valid)
>> 1929 jble mmu_print_tuple_print
>> 1930
>> 1931 cmpl %a0@(mmu_next_physical),%d1
>> 1932 jbeq mmu_print_tuple_increment
>> 1933
>> 1934 mmu_print_tuple_print:
>> 1935 putn %d0
>> 1936 puts "->"
>> 1937 putn %d1
>> 1938
>> 1939 movel %d1,%d6
>> 1940 jbsr %a6@
>> 1941
>> 1942 mmu_print_tuple_record:
>> 1943 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid)
>> 1944
>> 1945 movel %d1,%a0@(mmu_next_physical)
>> 1946
>> 1947 mmu_print_tuple_increment:
>> 1948 movel %d5,%d7
>> 1949 subl %a4,%d7
>> 1950 addl %d7,%a0@(mmu_next_physical)
>> 1951
>> 1952 mmu_print_tuple_exit:
>> 1953 moveml %sp@+,%d0-%d7/%a0
>> 1954 rts
>> 1955
>> 1956 mmu_print_machine_cpu_types:
>> 1957 puts "machine: "
>> 1958
>> 1959 is_not_amiga(1f)
>> 1960 puts "amiga"
>> 1961 jbra 9f
>> 1962 1:
>> 1963 is_not_atari(2f)
>> 1964 puts "atari"
>> 1965 jbra 9f
>> 1966 2:
>> 1967 is_not_mac(3f)
>> 1968 puts "macintosh"
>> 1969 jbra 9f
>> 1970 3: puts "unknown"
>> 1971 9: putc '\n'
>> 1972
>> 1973 puts "cputype: 0"
>> 1974 is_not_060(1f)
>> 1975 putc '6'
>> 1976 jbra 9f
>> 1977 1:
>> 1978 is_not_040_or_060(2f)
>> 1979 putc '4'
>> 1980 jbra 9f
>> 1981 2: putc '3'
>> 1982 9: putc '0'
>> 1983 putc '\n'
>> 1984
>> 1985 rts
>> 1986 #endif /* MMU_PRINT */
>> 1987
>> 1988 /*
>> 1989 * mmu_map_tt
>> 1990 *
>> 1991 * This is a specific function which works on all 680x0 machines.
>> 1992 * On 030, 040 & 060 it will attempt to use Transparent Translation
>> 1993 * registers (tt1).
>> 1994 * On 020 it will call the standard mmu_map which will use early
>> 1995 * terminating descriptors.
>> 1996 */
>> 1997 func_start mmu_map_tt,%d0/%d1/%a0,4
>> 1998
>> 1999 dputs "mmu_map_tt:"
>> 2000 dputn ARG1
>> 2001 dputn ARG2
>> 2002 dputn ARG3
>> 2003 dputn ARG4
>> 2004 dputc '\n'
>> 2005
>> 2006 is_020(L(do_map))
>> 2007
>> 2008 /* Extract the highest bit set
>> 2009 */
>> 2010 bfffo ARG3{#0,#32},%d1
>> 2011 cmpw #8,%d1
>> 2012 jcc L(do_map)
>> 2013
>> 2014 /* And get the mask
>> 2015 */
>> 2016 moveq #-1,%d0
>> 2017 lsrl %d1,%d0
>> 2018 lsrl #1,%d0
>> 2019
>> 2020 /* Mask the address
>> 2021 */
>> 2022 movel %d0,%d1
>> 2023 notl %d1
>> 2024 andl ARG2,%d1
>> 2025
>> 2026 /* Generate the upper 16bit of the tt register
>> 2027 */
>> 2028 lsrl #8,%d0
>> 2029 orl %d0,%d1
>> 2030 clrw %d1
>> 2031
>> 2032 is_040_or_060(L(mmu_map_tt_040))
>> 2033
>> 2034 /* set 030 specific bits (read/write access for supervisor mode
>> 2035 * (highest function code set, lower two bits masked))
>> 2036 */
>> 2037 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
>> 2038 movel ARG4,%d0
>> 2039 btst #6,%d0
>> 2040 jeq 1f
>> 2041 orw #TTR_CI,%d1
>> 2042
>> 2043 1: lea STACK,%a0
>> 2044 dputn %d1
>> 2045 movel %d1,%a0@
>> 2046 .chip 68030
>> 2047 tstl ARG1
>> 2048 jne 1f
>> 2049 pmove %a0@,%tt0
>> 2050 jra 2f
>> 2051 1: pmove %a0@,%tt1
>> 2052 2: .chip 68k
>> 2053 jra L(mmu_map_tt_done)
>> 2054
>> 2055 /* set 040 specific bits
>> 2056 */
>> 2057 L(mmu_map_tt_040):
>> 2058 orw #TTR_ENABLE+TTR_KERNELMODE,%d1
>> 2059 orl ARG4,%d1
>> 2060 dputn %d1
>> 2061
>> 2062 .chip 68040
>> 2063 tstl ARG1
>> 2064 jne 1f
>> 2065 movec %d1,%itt0
>> 2066 movec %d1,%dtt0
>> 2067 jra 2f
>> 2068 1: movec %d1,%itt1
>> 2069 movec %d1,%dtt1
>> 2070 2: .chip 68k
>> 2071
>> 2072 jra L(mmu_map_tt_done)
>> 2073
>> 2074 L(do_map):
>> 2075 mmu_map_eq ARG2,ARG3,ARG4
>> 2076
>> 2077 L(mmu_map_tt_done):
>> 2078
>> 2079 func_return mmu_map_tt
>> 2080
>> 2081 /*
>> 2082 * mmu_map
>> 2083 *
>> 2084 * This routine will map a range of memory using a pointer
>> 2085 * table and allocating the pages on the fly from the kernel.
>> 2086 * The pointer table does not have to be already linked into
>> 2087 * the root table, this routine will do that if necessary.
>> 2088 *
>> 2089 * NOTE
>> 2090 * This routine will assert failure and use the serial_putc
>> 2091 * routines in the case of a run-time error. For example,
>> 2092 * if the address is already mapped.
>> 2093 *
>> 2094 * NOTE-2
>> 2095 * This routine will use early terminating descriptors
>> 2096 * where possible for the 68020+68851 and 68030 type
>> 2097 * processors.
>> 2098 */
>> 2099 func_start mmu_map,%d0-%d4/%a0-%a4
>> 2100
>> 2101 dputs "\nmmu_map:"
>> 2102 dputn ARG1
>> 2103 dputn ARG2
>> 2104 dputn ARG3
>> 2105 dputn ARG4
>> 2106 dputc '\n'
>> 2107
>> 2108 /* Get logical address and round it down to 256KB
>> 2109 */
>> 2110 movel ARG1,%d0
>> 2111 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2112 movel %d0,%a3
>> 2113
>> 2114 /* Get the end address
>> 2115 */
>> 2116 movel ARG1,%a4
>> 2117 addl ARG3,%a4
>> 2118 subql #1,%a4
>> 2119
>> 2120 /* Get physical address and round it down to 256KB
>> 2121 */
>> 2122 movel ARG2,%d0
>> 2123 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2124 movel %d0,%a2
>> 2125
>> 2126 /* Add page attributes to the physical address
>> 2127 */
>> 2128 movel ARG4,%d0
>> 2129 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2130 addw %d0,%a2
>> 2131
>> 2132 dputn %a2
>> 2133 dputn %a3
>> 2134 dputn %a4
>> 2135
>> 2136 is_not_040_or_060(L(mmu_map_030))
>> 2137
>> 2138 addw #_PAGE_GLOBAL040,%a2
>> 2139 /*
>> 2140 * MMU 040 & 060 Support
>> 2141 *
>> 2142 * The MMU usage for the 040 and 060 is different enough from
>> 2143 * the 030 and 68851 that there is separate code. This comment
>> 2144 * block describes the data structures and algorithms built by
>> 2145 * this code.
>> 2146 *
>> 2147 * The 040 does not support early terminating descriptors, as
>> 2148 * the 030 does. Therefore, a third level of table is needed
>> 2149 * for the 040, and that would be the page table. In Linux,
>> 2150 * page tables are allocated directly from the memory above the
>> 2151 * kernel.
>> 2152 *
>> 2153 */
>> 2154
>> 2155 L(mmu_map_040):
>> 2156 /* Calculate the offset into the root table
>> 2157 */
>> 2158 movel %a3,%d0
>> 2159 moveq #ROOT_INDEX_SHIFT,%d1
>> 2160 lsrl %d1,%d0
>> 2161 mmu_get_root_table_entry %d0
>> 2162
>> 2163 /* Calculate the offset into the pointer table
>> 2164 */
>> 2165 movel %a3,%d0
>> 2166 moveq #PTR_INDEX_SHIFT,%d1
>> 2167 lsrl %d1,%d0
>> 2168 andl #PTR_TABLE_SIZE-1,%d0
>> 2169 mmu_get_ptr_table_entry %a0,%d0
>> 2170
>> 2171 /* Calculate the offset into the page table
>> 2172 */
>> 2173 movel %a3,%d0
>> 2174 moveq #PAGE_INDEX_SHIFT,%d1
>> 2175 lsrl %d1,%d0
>> 2176 andl #PAGE_TABLE_SIZE-1,%d0
>> 2177 mmu_get_page_table_entry %a0,%d0
>> 2178
>> 2179 /* The page table entry must not no be busy
>> 2180 */
>> 2181 tstl %a0@
>> 2182 jne L(mmu_map_error)
>> 2183
>> 2184 /* Do the mapping and advance the pointers
>> 2185 */
>> 2186 movel %a2,%a0@
>> 2187 2:
>> 2188 addw #PAGESIZE,%a2
>> 2189 addw #PAGESIZE,%a3
>> 2190
>> 2191 /* Ready with mapping?
>> 2192 */
>> 2193 lea %a3@(-1),%a0
>> 2194 cmpl %a0,%a4
>> 2195 jhi L(mmu_map_040)
>> 2196 jra L(mmu_map_done)
>> 2197
>> 2198 L(mmu_map_030):
>> 2199 /* Calculate the offset into the root table
>> 2200 */
>> 2201 movel %a3,%d0
>> 2202 moveq #ROOT_INDEX_SHIFT,%d1
>> 2203 lsrl %d1,%d0
>> 2204 mmu_get_root_table_entry %d0
>> 2205
>> 2206 /* Check if logical address 32MB aligned,
>> 2207 * so we can try to map it once
>> 2208 */
>> 2209 movel %a3,%d0
>> 2210 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
>> 2211 jne 1f
>> 2212
>> 2213 /* Is there enough to map for 32MB at once
>> 2214 */
>> 2215 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
>> 2216 cmpl %a1,%a4
>> 2217 jcs 1f
>> 2218
>> 2219 addql #1,%a1
>> 2220
>> 2221 /* The root table entry must not no be busy
>> 2222 */
>> 2223 tstl %a0@
>> 2224 jne L(mmu_map_error)
>> 2225
>> 2226 /* Do the mapping and advance the pointers
>> 2227 */
>> 2228 dputs "early term1"
>> 2229 dputn %a2
>> 2230 dputn %a3
>> 2231 dputn %a1
>> 2232 dputc '\n'
>> 2233 movel %a2,%a0@
>> 2234
>> 2235 movel %a1,%a3
>> 2236 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
>> 2237 jra L(mmu_mapnext_030)
>> 2238 1:
>> 2239 /* Calculate the offset into the pointer table
>> 2240 */
>> 2241 movel %a3,%d0
>> 2242 moveq #PTR_INDEX_SHIFT,%d1
>> 2243 lsrl %d1,%d0
>> 2244 andl #PTR_TABLE_SIZE-1,%d0
>> 2245 mmu_get_ptr_table_entry %a0,%d0
>> 2246
>> 2247 /* The pointer table entry must not no be busy
>> 2248 */
>> 2249 tstl %a0@
>> 2250 jne L(mmu_map_error)
>> 2251
>> 2252 /* Do the mapping and advance the pointers
>> 2253 */
>> 2254 dputs "early term2"
>> 2255 dputn %a2
>> 2256 dputn %a3
>> 2257 dputc '\n'
>> 2258 movel %a2,%a0@
>> 2259
>> 2260 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2
>> 2261 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3
>> 2262
>> 2263 L(mmu_mapnext_030):
>> 2264 /* Ready with mapping?
>> 2265 */
>> 2266 lea %a3@(-1),%a0
>> 2267 cmpl %a0,%a4
>> 2268 jhi L(mmu_map_030)
>> 2269 jra L(mmu_map_done)
>> 2270
>> 2271 L(mmu_map_error):
>> 2272
>> 2273 dputs "mmu_map error:"
>> 2274 dputn %a2
>> 2275 dputn %a3
>> 2276 dputc '\n'
>> 2277
>> 2278 L(mmu_map_done):
>> 2279
>> 2280 func_return mmu_map
>> 2281
>> 2282 /*
>> 2283 * mmu_fixup
>> 2284 *
>> 2285 * On the 040 class machines, all pages that are used for the
>> 2286 * mmu have to be fixed up.
>> 2287 */
>> 2288
>> 2289 func_start mmu_fixup_page_mmu_cache,%d0/%a0
>> 2290
>> 2291 dputs "mmu_fixup_page_mmu_cache"
>> 2292 dputn ARG1
>> 2293
>> 2294 /* Calculate the offset into the root table
>> 2295 */
>> 2296 movel ARG1,%d0
>> 2297 moveq #ROOT_INDEX_SHIFT,%d1
>> 2298 lsrl %d1,%d0
>> 2299 mmu_get_root_table_entry %d0
>> 2300
>> 2301 /* Calculate the offset into the pointer table
>> 2302 */
>> 2303 movel ARG1,%d0
>> 2304 moveq #PTR_INDEX_SHIFT,%d1
>> 2305 lsrl %d1,%d0
>> 2306 andl #PTR_TABLE_SIZE-1,%d0
>> 2307 mmu_get_ptr_table_entry %a0,%d0
>> 2308
>> 2309 /* Calculate the offset into the page table
>> 2310 */
>> 2311 movel ARG1,%d0
>> 2312 moveq #PAGE_INDEX_SHIFT,%d1
>> 2313 lsrl %d1,%d0
>> 2314 andl #PAGE_TABLE_SIZE-1,%d0
>> 2315 mmu_get_page_table_entry %a0,%d0
>> 2316
>> 2317 movel %a0@,%d0
>> 2318 andil #_CACHEMASK040,%d0
>> 2319 orl %pc@(m68k_pgtable_cachemode),%d0
>> 2320 movel %d0,%a0@
>> 2321
>> 2322 dputc '\n'
>> 2323
>> 2324 func_return mmu_fixup_page_mmu_cache
>> 2325
>> 2326 /*
>> 2327 * mmu_temp_map
>> 2328 *
>> 2329 * create a temporary mapping to enable the mmu,
>> 2330 * this we don't need any transparation translation tricks.
>> 2331 */
>> 2332
>> 2333 func_start mmu_temp_map,%d0/%d1/%a0/%a1
>> 2334
>> 2335 dputs "mmu_temp_map"
>> 2336 dputn ARG1
>> 2337 dputn ARG2
>> 2338 dputc '\n'
>> 2339
>> 2340 lea %pc@(L(temp_mmap_mem)),%a1
>> 2341
>> 2342 /* Calculate the offset in the root table
>> 2343 */
>> 2344 movel ARG2,%d0
>> 2345 moveq #ROOT_INDEX_SHIFT,%d1
>> 2346 lsrl %d1,%d0
>> 2347 mmu_get_root_table_entry %d0
>> 2348
>> 2349 /* Check if the table is temporary allocated, so we have to reuse it
>> 2350 */
>> 2351 movel %a0@,%d0
>> 2352 cmpl %pc@(L(memory_start)),%d0
>> 2353 jcc 1f
>> 2354
>> 2355 /* Temporary allocate a ptr table and insert it into the root table
>> 2356 */
>> 2357 movel %a1@,%d0
>> 2358 addl #PTR_TABLE_SIZE*4,%a1@
>> 2359 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2360 movel %d0,%a0@
>> 2361 dputs " (new)"
>> 2362 1:
>> 2363 dputn %d0
>> 2364 /* Mask the root table entry for the ptr table
>> 2365 */
>> 2366 andw #-ROOT_TABLE_SIZE,%d0
>> 2367 movel %d0,%a0
>> 2368
>> 2369 /* Calculate the offset into the pointer table
>> 2370 */
>> 2371 movel ARG2,%d0
>> 2372 moveq #PTR_INDEX_SHIFT,%d1
>> 2373 lsrl %d1,%d0
>> 2374 andl #PTR_TABLE_SIZE-1,%d0
>> 2375 lea %a0@(%d0*4),%a0
>> 2376 dputn %a0
>> 2377
>> 2378 /* Check if a temporary page table is already allocated
>> 2379 */
>> 2380 movel %a0@,%d0
>> 2381 jne 1f
>> 2382
>> 2383 /* Temporary allocate a page table and insert it into the ptr table
>> 2384 */
>> 2385 movel %a1@,%d0
>> 2386 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
>> 2387 alignment restriction for pointer tables on the '0[46]0. */
>> 2388 addl #512,%a1@
>> 2389 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2390 movel %d0,%a0@
>> 2391 dputs " (new)"
>> 2392 1:
>> 2393 dputn %d0
>> 2394 /* Mask the ptr table entry for the page table
>> 2395 */
>> 2396 andw #-PTR_TABLE_SIZE,%d0
>> 2397 movel %d0,%a0
>> 2398
>> 2399 /* Calculate the offset into the page table
>> 2400 */
>> 2401 movel ARG2,%d0
>> 2402 moveq #PAGE_INDEX_SHIFT,%d1
>> 2403 lsrl %d1,%d0
>> 2404 andl #PAGE_TABLE_SIZE-1,%d0
>> 2405 lea %a0@(%d0*4),%a0
>> 2406 dputn %a0
>> 2407
>> 2408 /* Insert the address into the page table
>> 2409 */
>> 2410 movel ARG1,%d0
>> 2411 andw #-PAGESIZE,%d0
>> 2412 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2413 movel %d0,%a0@
>> 2414 dputn %d0
>> 2415
>> 2416 dputc '\n'
>> 2417
>> 2418 func_return mmu_temp_map
>> 2419
>> 2420 func_start mmu_engage,%d0-%d2/%a0-%a3
>> 2421
>> 2422 moveq #ROOT_TABLE_SIZE-1,%d0
>> 2423 /* Temporarily use a different root table. */
>> 2424 lea %pc@(L(kernel_pgdir_ptr)),%a0
>> 2425 movel %a0@,%a2
>> 2426 movel %pc@(L(memory_start)),%a1
>> 2427 movel %a1,%a0@
>> 2428 movel %a2,%a0
>> 2429 1:
>> 2430 movel %a0@+,%a1@+
>> 2431 dbra %d0,1b
>> 2432
>> 2433 lea %pc@(L(temp_mmap_mem)),%a0
>> 2434 movel %a1,%a0@
>> 2435
>> 2436 movew #PAGESIZE-1,%d0
>> 2437 1:
>> 2438 clrl %a1@+
>> 2439 dbra %d0,1b
>> 2440
>> 2441 lea %pc@(1b),%a0
>> 2442 movel #1b,%a1
>> 2443 /* Skip temp mappings if phys == virt */
>> 2444 cmpl %a0,%a1
>> 2445 jeq 1f
>> 2446
>> 2447 mmu_temp_map %a0,%a0
>> 2448 mmu_temp_map %a0,%a1
>> 2449
>> 2450 addw #PAGESIZE,%a0
>> 2451 addw #PAGESIZE,%a1
>> 2452 mmu_temp_map %a0,%a0
>> 2453 mmu_temp_map %a0,%a1
>> 2454 1:
>> 2455 movel %pc@(L(memory_start)),%a3
>> 2456 movel %pc@(L(phys_kernel_start)),%d2
>> 2457
>> 2458 is_not_040_or_060(L(mmu_engage_030))
>> 2459
>> 2460 L(mmu_engage_040):
>> 2461 .chip 68040
>> 2462 nop
>> 2463 cinva %bc
>> 2464 nop
>> 2465 pflusha
>> 2466 nop
>> 2467 movec %a3,%srp
>> 2468 movel #TC_ENABLE+TC_PAGE4K,%d0
>> 2469 movec %d0,%tc /* enable the MMU */
>> 2470 jmp 1f:l
>> 2471 1: nop
>> 2472 movec %a2,%srp
>> 2473 nop
>> 2474 cinva %bc
>> 2475 nop
>> 2476 pflusha
>> 2477 .chip 68k
>> 2478 jra L(mmu_engage_cleanup)
>> 2479
>> 2480 L(mmu_engage_030_temp):
>> 2481 .space 12
>> 2482 L(mmu_engage_030):
>> 2483 .chip 68030
>> 2484 lea %pc@(L(mmu_engage_030_temp)),%a0
>> 2485 movel #0x80000002,%a0@
>> 2486 movel %a3,%a0@(4)
>> 2487 movel #0x0808,%d0
>> 2488 movec %d0,%cacr
>> 2489 pmove %a0@,%srp
>> 2490 pflusha
>> 2491 /*
>> 2492 * enable,super root enable,4096 byte pages,7 bit root index,
>> 2493 * 7 bit pointer index, 6 bit page table index.
>> 2494 */
>> 2495 movel #0x82c07760,%a0@(8)
>> 2496 pmove %a0@(8),%tc /* enable the MMU */
>> 2497 jmp 1f:l
>> 2498 1: movel %a2,%a0@(4)
>> 2499 movel #0x0808,%d0
>> 2500 movec %d0,%cacr
>> 2501 pmove %a0@,%srp
>> 2502 pflusha
>> 2503 .chip 68k
>> 2504
>> 2505 L(mmu_engage_cleanup):
>> 2506 subl #PAGE_OFFSET,%d2
>> 2507 subl %d2,%a2
>> 2508 movel %a2,L(kernel_pgdir_ptr)
>> 2509 subl %d2,%fp
>> 2510 subl %d2,%sp
>> 2511 subl %d2,ARG0
>> 2512
>> 2513 func_return mmu_engage
>> 2514
>> 2515 func_start mmu_get_root_table_entry,%d0/%a1
>> 2516
>> 2517 #if 0
>> 2518 dputs "mmu_get_root_table_entry:"
>> 2519 dputn ARG1
>> 2520 dputs " ="
>> 2521 #endif
>> 2522
>> 2523 movel %pc@(L(kernel_pgdir_ptr)),%a0
>> 2524 tstl %a0
>> 2525 jne 2f
>> 2526
>> 2527 dputs "\nmmu_init:"
>> 2528
>> 2529 /* Find the start of free memory, get_bi_record does this for us,
>> 2530 * as the bootinfo structure is located directly behind the kernel
>> 2531 * and and we simply search for the last entry.
>> 2532 */
>> 2533 get_bi_record BI_LAST
>> 2534 addw #PAGESIZE-1,%a0
>> 2535 movel %a0,%d0
>> 2536 andw #-PAGESIZE,%d0
>> 2537
>> 2538 dputn %d0
>> 2539
>> 2540 lea %pc@(L(memory_start)),%a0
>> 2541 movel %d0,%a0@
>> 2542 lea %pc@(L(kernel_end)),%a0
>> 2543 movel %d0,%a0@
>> 2544
>> 2545 /* we have to return the first page at _stext since the init code
>> 2546 * in mm/init.c simply expects kernel_pg_dir there, the rest of
>> 2547 * page is used for further ptr tables in get_ptr_table.
>> 2548 */
>> 2549 lea %pc@(_stext),%a0
>> 2550 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2551 movel %a0,%a1@
>> 2552 addl #ROOT_TABLE_SIZE*4,%a1@
>> 2553
>> 2554 lea %pc@(L(mmu_num_pointer_tables)),%a1
>> 2555 addql #1,%a1@
>> 2556
>> 2557 /* clear the page
>> 2558 */
>> 2559 movel %a0,%a1
>> 2560 movew #PAGESIZE/4-1,%d0
>> 2561 1:
>> 2562 clrl %a1@+
>> 2563 dbra %d0,1b
>> 2564
>> 2565 lea %pc@(L(kernel_pgdir_ptr)),%a1
>> 2566 movel %a0,%a1@
>> 2567
>> 2568 dputn %a0
>> 2569 dputc '\n'
>> 2570 2:
>> 2571 movel ARG1,%d0
>> 2572 lea %a0@(%d0*4),%a0
>> 2573
>> 2574 #if 0
>> 2575 dputn %a0
>> 2576 dputc '\n'
>> 2577 #endif
>> 2578
>> 2579 func_return mmu_get_root_table_entry
>> 2580
>> 2581
>> 2582
>> 2583 func_start mmu_get_ptr_table_entry,%d0/%a1
>> 2584
>> 2585 #if 0
>> 2586 dputs "mmu_get_ptr_table_entry:"
>> 2587 dputn ARG1
>> 2588 dputn ARG2
>> 2589 dputs " ="
>> 2590 #endif
>> 2591
>> 2592 movel ARG1,%a0
>> 2593 movel %a0@,%d0
>> 2594 jne 2f
>> 2595
>> 2596 /* Keep track of the number of pointer tables we use
>> 2597 */
>> 2598 dputs "\nmmu_get_new_ptr_table:"
>> 2599 lea %pc@(L(mmu_num_pointer_tables)),%a0
>> 2600 movel %a0@,%d0
>> 2601 addql #1,%a0@
>> 2602
>> 2603 /* See if there is a free pointer table in our cache of pointer tables
>> 2604 */
>> 2605 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2606 andw #7,%d0
>> 2607 jne 1f
>> 2608
>> 2609 /* Get a new pointer table page from above the kernel memory
>> 2610 */
>> 2611 get_new_page
>> 2612 movel %a0,%a1@
>> 2613 1:
>> 2614 /* There is an unused pointer table in our cache... use it
>> 2615 */
>> 2616 movel %a1@,%d0
>> 2617 addl #PTR_TABLE_SIZE*4,%a1@
>> 2618
>> 2619 dputn %d0
>> 2620 dputc '\n'
>> 2621
>> 2622 /* Insert the new pointer table into the root table
>> 2623 */
>> 2624 movel ARG1,%a0
>> 2625 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2626 movel %d0,%a0@
>> 2627 2:
>> 2628 /* Extract the pointer table entry
>> 2629 */
>> 2630 andw #-PTR_TABLE_SIZE,%d0
>> 2631 movel %d0,%a0
>> 2632 movel ARG2,%d0
>> 2633 lea %a0@(%d0*4),%a0
>> 2634
>> 2635 #if 0
>> 2636 dputn %a0
>> 2637 dputc '\n'
>> 2638 #endif
>> 2639
>> 2640 func_return mmu_get_ptr_table_entry
>> 2641
>> 2642
>> 2643 func_start mmu_get_page_table_entry,%d0/%a1
>> 2644
>> 2645 #if 0
>> 2646 dputs "mmu_get_page_table_entry:"
>> 2647 dputn ARG1
>> 2648 dputn ARG2
>> 2649 dputs " ="
>> 2650 #endif
>> 2651
>> 2652 movel ARG1,%a0
>> 2653 movel %a0@,%d0
>> 2654 jne 2f
>> 2655
>> 2656 /* If the page table entry doesn't exist, we allocate a complete new
>> 2657 * page and use it as one continues big page table which can cover
>> 2658 * 4MB of memory, nearly almost all mappings have that alignment.
>> 2659 */
>> 2660 get_new_page
>> 2661 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0
>> 2662
>> 2663 /* align pointer table entry for a page of page tables
>> 2664 */
>> 2665 movel ARG1,%d0
>> 2666 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
>> 2667 movel %d0,%a1
>> 2668
>> 2669 /* Insert the page tables into the pointer entries
>> 2670 */
>> 2671 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
>> 2672 1:
>> 2673 movel %a0,%a1@+
>> 2674 lea %a0@(PAGE_TABLE_SIZE*4),%a0
>> 2675 dbra %d0,1b
>> 2676
>> 2677 /* Now we can get the initialized pointer table entry
>> 2678 */
>> 2679 movel ARG1,%a0
>> 2680 movel %a0@,%d0
>> 2681 2:
>> 2682 /* Extract the page table entry
>> 2683 */
>> 2684 andw #-PAGE_TABLE_SIZE,%d0
>> 2685 movel %d0,%a0
>> 2686 movel ARG2,%d0
>> 2687 lea %a0@(%d0*4),%a0
>> 2688
>> 2689 #if 0
>> 2690 dputn %a0
>> 2691 dputc '\n'
>> 2692 #endif
>> 2693
>> 2694 func_return mmu_get_page_table_entry
>> 2695
>> 2696 /*
>> 2697 * get_new_page
>> 2698 *
>> 2699 * Return a new page from the memory start and clear it.
>> 2700 */
>> 2701 func_start get_new_page,%d0/%a1
>> 2702
>> 2703 dputs "\nget_new_page:"
>> 2704
>> 2705 /* allocate the page and adjust memory_start
>> 2706 */
>> 2707 lea %pc@(L(memory_start)),%a0
>> 2708 movel %a0@,%a1
>> 2709 addl #PAGESIZE,%a0@
>> 2710
>> 2711 /* clear the new page
>> 2712 */
>> 2713 movel %a1,%a0
>> 2714 movew #PAGESIZE/4-1,%d0
>> 2715 1:
>> 2716 clrl %a1@+
>> 2717 dbra %d0,1b
>> 2718
>> 2719 dputn %a0
>> 2720 dputc '\n'
>> 2721
>> 2722 func_return get_new_page
>> 2723
>> 2724
>> 2725
>> 2726 /*
>> 2727 * Debug output support
>> 2728 * Atarians have a choice between the parallel port, the serial port
>> 2729 * from the MFP or a serial port of the SCC
>> 2730 */
>> 2731
>> 2732 #ifdef CONFIG_MAC
>> 2733 /* You may define either or both of these. */
>> 2734 #define MAC_USE_SCC_A /* Modem port */
>> 2735 #define MAC_USE_SCC_B /* Printer port */
>> 2736
>> 2737 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 2738 /* Initialisation table for SCC with 3.6864 MHz PCLK */
>> 2739 L(scc_initable_mac):
>> 2740 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2741 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2742 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2743 .byte 10,0 /* NRZ */
>> 2744 .byte 11,0x50 /* use baud rate generator */
>> 2745 .byte 12,1,13,0 /* 38400 baud */
>> 2746 .byte 14,1 /* Baud rate generator enable */
>> 2747 .byte 3,0xc1 /* enable receiver */
>> 2748 .byte 5,0xea /* enable transmitter */
>> 2749 .byte -1
>> 2750 .even
>> 2751 #endif
>> 2752 #endif /* CONFIG_MAC */
>> 2753
>> 2754 #ifdef CONFIG_ATARI
>> 2755 /* #define USE_PRINTER */
>> 2756 /* #define USE_SCC_B */
>> 2757 /* #define USE_SCC_A */
>> 2758 #define USE_MFP
>> 2759
>> 2760 #if defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2761 /* Initialisation table for SCC with 7.9872 MHz PCLK */
>> 2762 /* PCLK == 8.0539 gives baud == 9680.1 */
>> 2763 L(scc_initable_atari):
>> 2764 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2765 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2766 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2767 .byte 10,0 /* NRZ */
>> 2768 .byte 11,0x50 /* use baud rate generator */
>> 2769 .byte 12,24,13,0 /* 9600 baud */
>> 2770 .byte 14,2,14,3 /* use master clock for BRG, enable */
>> 2771 .byte 3,0xc1 /* enable receiver */
>> 2772 .byte 5,0xea /* enable transmitter */
>> 2773 .byte -1
>> 2774 .even
>> 2775 #endif
>> 2776
>> 2777 #ifdef USE_PRINTER
>> 2778
>> 2779 LPSG_SELECT = 0xff8800
>> 2780 LPSG_READ = 0xff8800
>> 2781 LPSG_WRITE = 0xff8802
>> 2782 LPSG_IO_A = 14
>> 2783 LPSG_IO_B = 15
>> 2784 LPSG_CONTROL = 7
>> 2785 LSTMFP_GPIP = 0xfffa01
>> 2786 LSTMFP_DDR = 0xfffa05
>> 2787 LSTMFP_IERB = 0xfffa09
>> 2788
>> 2789 #elif defined(USE_SCC_B)
>> 2790
>> 2791 LSCC_CTRL = 0xff8c85
>> 2792 LSCC_DATA = 0xff8c87
>> 2793
>> 2794 #elif defined(USE_SCC_A)
>> 2795
>> 2796 LSCC_CTRL = 0xff8c81
>> 2797 LSCC_DATA = 0xff8c83
>> 2798
>> 2799 #elif defined(USE_MFP)
>> 2800
>> 2801 LMFP_UCR = 0xfffa29
>> 2802 LMFP_TDCDR = 0xfffa1d
>> 2803 LMFP_TDDR = 0xfffa25
>> 2804 LMFP_TSR = 0xfffa2d
>> 2805 LMFP_UDR = 0xfffa2f
>> 2806
>> 2807 #endif
>> 2808 #endif /* CONFIG_ATARI */
>> 2809
>> 2810 /*
>> 2811 * Serial port output support.
>> 2812 */
>> 2813
>> 2814 /*
>> 2815 * Initialize serial port hardware
>> 2816 */
>> 2817 func_start serial_init,%d0/%d1/%a0/%a1
>> 2818 /*
>> 2819 * Some of the register usage that follows
>> 2820 * CONFIG_AMIGA
>> 2821 * a0 = pointer to boot info record
>> 2822 * d0 = boot info offset
>> 2823 * CONFIG_ATARI
>> 2824 * a0 = address of SCC
>> 2825 * a1 = Liobase address/address of scc_initable_atari
>> 2826 * d0 = init data for serial port
>> 2827 * CONFIG_MAC
>> 2828 * a0 = address of SCC
>> 2829 * a1 = address of scc_initable_mac
>> 2830 * d0 = init data for serial port
>> 2831 */
>> 2832
>> 2833 #ifdef CONFIG_AMIGA
>> 2834 #define SERIAL_DTR 7
>> 2835 #define SERIAL_CNTRL CIABBASE+C_PRA
>> 2836
>> 2837 is_not_amiga(1f)
>> 2838 lea %pc@(L(custom)),%a0
>> 2839 movel #-ZTWOBASE,%a0@
>> 2840 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
>> 2841 get_bi_record BI_AMIGA_SERPER
>> 2842 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2843 | movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2844 1:
>> 2845 #endif
>> 2846
>> 2847 #ifdef CONFIG_ATARI
>> 2848 is_not_atari(4f)
>> 2849 movel %pc@(L(iobase)),%a1
>> 2850 #if defined(USE_PRINTER)
>> 2851 bclr #0,%a1@(LSTMFP_IERB)
>> 2852 bclr #0,%a1@(LSTMFP_DDR)
>> 2853 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT)
>> 2854 moveb #0xff,%a1@(LPSG_WRITE)
>> 2855 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 2856 clrb %a1@(LPSG_WRITE)
>> 2857 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 2858 moveb %a1@(LPSG_READ),%d0
>> 2859 bset #5,%d0
>> 2860 moveb %d0,%a1@(LPSG_WRITE)
>> 2861 #elif defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2862 lea %a1@(LSCC_CTRL),%a0
>> 2863 /* Reset SCC register pointer */
>> 2864 moveb %a0@,%d0
>> 2865 /* Reset SCC device: write register pointer then register value */
>> 2866 moveb #9,%a0@
>> 2867 moveb #0xc0,%a0@
>> 2868 /* Wait for 5 PCLK cycles, which is about 63 CPU cycles */
>> 2869 /* 5 / 7.9872 MHz = approx. 0.63 us = 63 / 100 MHz */
>> 2870 movel #32,%d0
>> 2871 2:
>> 2872 subq #1,%d0
>> 2873 jne 2b
>> 2874 /* Initialize channel */
>> 2875 lea %pc@(L(scc_initable_atari)),%a1
>> 2876 2: moveb %a1@+,%d0
>> 2877 jmi 3f
>> 2878 moveb %d0,%a0@
>> 2879 moveb %a1@+,%a0@
>> 2880 jra 2b
>> 2881 3: clrb %a0@
>> 2882 #elif defined(USE_MFP)
>> 2883 bclr #1,%a1@(LMFP_TSR)
>> 2884 moveb #0x88,%a1@(LMFP_UCR)
>> 2885 andb #0x70,%a1@(LMFP_TDCDR)
>> 2886 moveb #2,%a1@(LMFP_TDDR)
>> 2887 orb #1,%a1@(LMFP_TDCDR)
>> 2888 bset #1,%a1@(LMFP_TSR)
>> 2889 #endif
>> 2890 jra L(serial_init_done)
>> 2891 4:
>> 2892 #endif
>> 2893
>> 2894 #ifdef CONFIG_MAC
>> 2895 is_not_mac(L(serial_init_not_mac))
>> 2896 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 2897 #define mac_scc_cha_b_ctrl_offset 0x0
>> 2898 #define mac_scc_cha_a_ctrl_offset 0x2
>> 2899 #define mac_scc_cha_b_data_offset 0x4
>> 2900 #define mac_scc_cha_a_data_offset 0x6
>> 2901 movel %pc@(L(mac_sccbase)),%a0
>> 2902 /* Reset SCC register pointer */
>> 2903 moveb %a0@(mac_scc_cha_a_ctrl_offset),%d0
>> 2904 /* Reset SCC device: write register pointer then register value */
>> 2905 moveb #9,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2906 moveb #0xc0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2907 /* Wait for 5 PCLK cycles, which is about 68 CPU cycles */
>> 2908 /* 5 / 3.6864 MHz = approx. 1.36 us = 68 / 50 MHz */
>> 2909 movel #35,%d0
>> 2910 5:
>> 2911 subq #1,%d0
>> 2912 jne 5b
>> 2913 #endif
>> 2914 #ifdef MAC_USE_SCC_A
>> 2915 /* Initialize channel A */
>> 2916 lea %pc@(L(scc_initable_mac)),%a1
>> 2917 5: moveb %a1@+,%d0
>> 2918 jmi 6f
>> 2919 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2920 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2921 jra 5b
>> 2922 6:
>> 2923 #endif /* MAC_USE_SCC_A */
>> 2924 #ifdef MAC_USE_SCC_B
>> 2925 /* Initialize channel B */
>> 2926 lea %pc@(L(scc_initable_mac)),%a1
>> 2927 7: moveb %a1@+,%d0
>> 2928 jmi 8f
>> 2929 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2930 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2931 jra 7b
>> 2932 8:
>> 2933 #endif /* MAC_USE_SCC_B */
>> 2934 jra L(serial_init_done)
>> 2935 L(serial_init_not_mac):
>> 2936 #endif /* CONFIG_MAC */
>> 2937
>> 2938 #ifdef CONFIG_Q40
>> 2939 is_not_q40(2f)
>> 2940 /* debug output goes into SRAM, so we don't do it unless requested
>> 2941 - check for '%LX$' signature in SRAM */
>> 2942 lea %pc@(q40_mem_cptr),%a1
>> 2943 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */
>> 2944 move.l #0xff020000,%a1
>> 2945 cmp.b #'%',%a1@
>> 2946 bne 2f /*nodbg*/
>> 2947 addq.w #4,%a1
>> 2948 cmp.b #'L',%a1@
>> 2949 bne 2f /*nodbg*/
>> 2950 addq.w #4,%a1
>> 2951 cmp.b #'X',%a1@
>> 2952 bne 2f /*nodbg*/
>> 2953 addq.w #4,%a1
>> 2954 cmp.b #'$',%a1@
>> 2955 bne 2f /*nodbg*/
>> 2956 /* signature OK */
>> 2957 lea %pc@(L(q40_do_debug)),%a1
>> 2958 tas %a1@
>> 2959 /*nodbg: q40_do_debug is 0 by default*/
>> 2960 2:
>> 2961 #endif
>> 2962
>> 2963 #ifdef CONFIG_MVME16x
>> 2964 is_not_mvme16x(L(serial_init_not_mvme16x))
>> 2965 moveb #0x10,M167_PCSCCMICR
>> 2966 moveb #0x10,M167_PCSCCTICR
>> 2967 moveb #0x10,M167_PCSCCRICR
>> 2968 jra L(serial_init_done)
>> 2969 L(serial_init_not_mvme16x):
>> 2970 #endif
>> 2971
>> 2972 #ifdef CONFIG_APOLLO
>> 2973 /* We count on the PROM initializing SIO1 */
>> 2974 #endif
>> 2975
>> 2976 #ifdef CONFIG_HP300
>> 2977 /* We count on the boot loader initialising the UART */
>> 2978 #endif
>> 2979
>> 2980 L(serial_init_done):
>> 2981 func_return serial_init
>> 2982
>> 2983 /*
>> 2984 * Output character on serial port.
>> 2985 */
>> 2986 func_start serial_putc,%d0/%d1/%a0/%a1
>> 2987
>> 2988 movel ARG1,%d0
>> 2989 cmpib #'\n',%d0
>> 2990 jbne 1f
>> 2991
>> 2992 /* A little safe recursion is good for the soul */
>> 2993 serial_putc #'\r'
>> 2994 1:
>> 2995
>> 2996 #ifdef CONFIG_AMIGA
>> 2997 is_not_amiga(2f)
>> 2998 andw #0x00ff,%d0
>> 2999 oriw #0x0100,%d0
>> 3000 movel %pc@(L(custom)),%a0
>> 3001 movew %d0,%a0@(CUSTOMBASE+C_SERDAT)
>> 3002 1: movew %a0@(CUSTOMBASE+C_SERDATR),%d0
>> 3003 andw #0x2000,%d0
>> 3004 jeq 1b
>> 3005 jra L(serial_putc_done)
>> 3006 2:
>> 3007 #endif
>> 3008
>> 3009 #ifdef CONFIG_MAC
>> 3010 is_not_mac(5f)
>> 3011 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 3012 movel %pc@(L(mac_sccbase)),%a1
>> 3013 #endif
>> 3014 #ifdef MAC_USE_SCC_A
>> 3015 3: btst #2,%a1@(mac_scc_cha_a_ctrl_offset)
>> 3016 jeq 3b
>> 3017 moveb %d0,%a1@(mac_scc_cha_a_data_offset)
>> 3018 #endif /* MAC_USE_SCC_A */
>> 3019 #ifdef MAC_USE_SCC_B
>> 3020 4: btst #2,%a1@(mac_scc_cha_b_ctrl_offset)
>> 3021 jeq 4b
>> 3022 moveb %d0,%a1@(mac_scc_cha_b_data_offset)
>> 3023 #endif /* MAC_USE_SCC_B */
>> 3024 jra L(serial_putc_done)
>> 3025 5:
>> 3026 #endif /* CONFIG_MAC */
>> 3027
>> 3028 #ifdef CONFIG_ATARI
>> 3029 is_not_atari(4f)
>> 3030 movel %pc@(L(iobase)),%a1
>> 3031 #if defined(USE_PRINTER)
>> 3032 3: btst #0,%a1@(LSTMFP_GPIP)
>> 3033 jne 3b
>> 3034 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 3035 moveb %d0,%a1@(LPSG_WRITE)
>> 3036 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 3037 moveb %a1@(LPSG_READ),%d0
>> 3038 bclr #5,%d0
>> 3039 moveb %d0,%a1@(LPSG_WRITE)
>> 3040 nop
>> 3041 nop
>> 3042 bset #5,%d0
>> 3043 moveb %d0,%a1@(LPSG_WRITE)
>> 3044 #elif defined(USE_SCC_A) || defined(USE_SCC_B)
>> 3045 3: btst #2,%a1@(LSCC_CTRL)
>> 3046 jeq 3b
>> 3047 moveb %d0,%a1@(LSCC_DATA)
>> 3048 #elif defined(USE_MFP)
>> 3049 3: btst #7,%a1@(LMFP_TSR)
>> 3050 jeq 3b
>> 3051 moveb %d0,%a1@(LMFP_UDR)
>> 3052 #endif
>> 3053 jra L(serial_putc_done)
>> 3054 4:
>> 3055 #endif /* CONFIG_ATARI */
>> 3056
>> 3057 #ifdef CONFIG_MVME147
>> 3058 is_not_mvme147(2f)
>> 3059 1: btst #2,M147_SCC_CTRL_A
>> 3060 jeq 1b
>> 3061 moveb %d0,M147_SCC_DATA_A
>> 3062 jbra L(serial_putc_done)
>> 3063 2:
>> 3064 #endif
>> 3065
>> 3066 #ifdef CONFIG_MVME16x
>> 3067 is_not_mvme16x(2f)
>> 3068 /*
>> 3069 * If the loader gave us a board type then we can use that to
>> 3070 * select an appropriate output routine; otherwise we just use
>> 3071 * the Bug code. If we have to use the Bug that means the Bug
>> 3072 * workspace has to be valid, which means the Bug has to use
>> 3073 * the SRAM, which is non-standard.
>> 3074 */
>> 3075 moveml %d0-%d7/%a2-%a6,%sp@-
>> 3076 movel vme_brdtype,%d1
>> 3077 jeq 1f | No tag - use the Bug
>> 3078 cmpi #VME_TYPE_MVME162,%d1
>> 3079 jeq 6f
>> 3080 cmpi #VME_TYPE_MVME172,%d1
>> 3081 jne 5f
>> 3082 /* 162/172; it's an SCC */
>> 3083 6: btst #2,M162_SCC_CTRL_A
>> 3084 nop
>> 3085 nop
>> 3086 nop
>> 3087 jeq 6b
>> 3088 moveb #8,M162_SCC_CTRL_A
>> 3089 nop
>> 3090 nop
>> 3091 nop
>> 3092 moveb %d0,M162_SCC_CTRL_A
>> 3093 jra 3f
>> 3094 5:
>> 3095 /* 166/167/177; it's a CD2401 */
>> 3096 moveb #0,M167_CYCAR
>> 3097 moveb M167_CYIER,%d2
>> 3098 moveb #0x02,M167_CYIER
>> 3099 7:
>> 3100 btst #5,M167_PCSCCTICR
>> 3101 jeq 7b
>> 3102 moveb M167_PCTPIACKR,%d1
>> 3103 moveb M167_CYLICR,%d1
>> 3104 jeq 8f
>> 3105 moveb #0x08,M167_CYTEOIR
>> 3106 jra 7b
>> 3107 8:
>> 3108 moveb %d0,M167_CYTDR
>> 3109 moveb #0,M167_CYTEOIR
>> 3110 moveb %d2,M167_CYIER
>> 3111 jra 3f
>> 3112 1:
>> 3113 moveb %d0,%sp@-
>> 3114 trap #15
>> 3115 .word 0x0020 /* TRAP 0x020 */
>> 3116 3:
>> 3117 moveml %sp@+,%d0-%d7/%a2-%a6
>> 3118 jbra L(serial_putc_done)
>> 3119 2:
>> 3120 #endif /* CONFIG_MVME16x */
>> 3121
>> 3122 #ifdef CONFIG_BVME6000
>> 3123 is_not_bvme6000(2f)
>> 3124 /*
>> 3125 * The BVME6000 machine has a serial port ...
>> 3126 */
>> 3127 1: btst #2,BVME_SCC_CTRL_A
>> 3128 jeq 1b
>> 3129 moveb %d0,BVME_SCC_DATA_A
>> 3130 jbra L(serial_putc_done)
>> 3131 2:
>> 3132 #endif
>> 3133
>> 3134 #ifdef CONFIG_SUN3X
>> 3135 is_not_sun3x(2f)
>> 3136 movel %d0,-(%sp)
>> 3137 movel 0xFEFE0018,%a1
>> 3138 jbsr (%a1)
>> 3139 addq #4,%sp
>> 3140 jbra L(serial_putc_done)
>> 3141 2:
>> 3142 #endif
>> 3143
>> 3144 #ifdef CONFIG_Q40
>> 3145 is_not_q40(2f)
>> 3146 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */
>> 3147 beq 2f
>> 3148 lea %pc@(q40_mem_cptr),%a1
>> 3149 move.l %a1@,%a0
>> 3150 move.b %d0,%a0@
>> 3151 addq.l #4,%a0
>> 3152 move.l %a0,%a1@
>> 3153 jbra L(serial_putc_done)
>> 3154 2:
>> 3155 #endif
>> 3156
>> 3157 #ifdef CONFIG_APOLLO
>> 3158 is_not_apollo(2f)
>> 3159 movl %pc@(L(iobase)),%a1
>> 3160 moveb %d0,%a1@(LTHRB0)
>> 3161 1: moveb %a1@(LSRB0),%d0
>> 3162 andb #0x4,%d0
>> 3163 beq 1b
>> 3164 jbra L(serial_putc_done)
>> 3165 2:
>> 3166 #endif
>> 3167
>> 3168 #ifdef CONFIG_HP300
>> 3169 is_not_hp300(3f)
>> 3170 movl %pc@(L(iobase)),%a1
>> 3171 addl %pc@(L(uartbase)),%a1
>> 3172 movel %pc@(L(uart_scode)),%d1 /* Check the scode */
>> 3173 jmi 3f /* Unset? Exit */
>> 3174 cmpi #256,%d1 /* APCI scode? */
>> 3175 jeq 2f
>> 3176 1: moveb %a1@(DCALSR),%d1 /* Output to DCA */
>> 3177 andb #0x20,%d1
>> 3178 beq 1b
>> 3179 moveb %d0,%a1@(DCADATA)
>> 3180 jbra L(serial_putc_done)
>> 3181 2: moveb %a1@(APCILSR),%d1 /* Output to APCI */
>> 3182 andb #0x20,%d1
>> 3183 beq 2b
>> 3184 moveb %d0,%a1@(APCIDATA)
>> 3185 jbra L(serial_putc_done)
>> 3186 3:
>> 3187 #endif
>> 3188
>> 3189 L(serial_putc_done):
>> 3190 func_return serial_putc
>> 3191
>> 3192 /*
>> 3193 * Output a string.
>> 3194 */
>> 3195 func_start puts,%d0/%a0
>> 3196
>> 3197 movel ARG1,%a0
>> 3198 jra 2f
>> 3199 1:
>> 3200 #ifdef CONSOLE_DEBUG
>> 3201 console_putc %d0
>> 3202 #endif
>> 3203 #ifdef SERIAL_DEBUG
>> 3204 serial_putc %d0
>> 3205 #endif
>> 3206 2: moveb %a0@+,%d0
>> 3207 jne 1b
>> 3208
>> 3209 func_return puts
>> 3210
>> 3211 /*
>> 3212 * Output number in hex notation.
>> 3213 */
>> 3214
>> 3215 func_start putn,%d0-%d2
>> 3216
>> 3217 putc ' '
>> 3218
>> 3219 movel ARG1,%d0
>> 3220 moveq #7,%d1
>> 3221 1: roll #4,%d0
>> 3222 move %d0,%d2
>> 3223 andb #0x0f,%d2
>> 3224 addb #'0',%d2
>> 3225 cmpb #'9',%d2
>> 3226 jls 2f
>> 3227 addb #'A'-('9'+1),%d2
>> 3228 2:
>> 3229 #ifdef CONSOLE_DEBUG
>> 3230 console_putc %d2
>> 3231 #endif
>> 3232 #ifdef SERIAL_DEBUG
>> 3233 serial_putc %d2
>> 3234 #endif
>> 3235 dbra %d1,1b
>> 3236
>> 3237 func_return putn
>> 3238
>> 3239 #ifdef CONFIG_EARLY_PRINTK
>> 3240 /*
>> 3241 * This routine takes its parameters on the stack. It then
>> 3242 * turns around and calls the internal routines. This routine
>> 3243 * is used by the boot console.
>> 3244 *
>> 3245 * The calling parameters are:
>> 3246 * void debug_cons_nputs(const char *str, unsigned length)
>> 3247 *
>> 3248 * This routine does NOT understand variable arguments only
>> 3249 * simple strings!
>> 3250 */
>> 3251 ENTRY(debug_cons_nputs)
>> 3252 moveml %d0/%d1/%a0,%sp@-
>> 3253 movew %sr,%sp@-
>> 3254 ori #0x0700,%sr
>> 3255 movel %sp@(18),%a0 /* fetch parameter */
>> 3256 movel %sp@(22),%d1 /* fetch parameter */
>> 3257 jra 2f
>> 3258 1:
>> 3259 #ifdef CONSOLE_DEBUG
>> 3260 console_putc %d0
>> 3261 #endif
>> 3262 #ifdef SERIAL_DEBUG
>> 3263 serial_putc %d0
>> 3264 #endif
>> 3265 subq #1,%d1
>> 3266 2: jeq 3f
>> 3267 moveb %a0@+,%d0
>> 3268 jne 1b
>> 3269 3:
>> 3270 movew %sp@+,%sr
>> 3271 moveml %sp@+,%d0/%d1/%a0
>> 3272 rts
>> 3273 #endif /* CONFIG_EARLY_PRINTK */
>> 3274
>> 3275 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3276 func_start set_leds,%d0/%a0
>> 3277 movel ARG1,%d0
>> 3278 #ifdef CONFIG_HP300
>> 3279 is_not_hp300(1f)
>> 3280 movel %pc@(L(iobase)),%a0
>> 3281 moveb %d0,%a0@(0x1ffff)
>> 3282 jra 2f
>> 3283 #endif
>> 3284 1:
>> 3285 #ifdef CONFIG_APOLLO
>> 3286 movel %pc@(L(iobase)),%a0
>> 3287 lsll #8,%d0
>> 3288 eorw #0xff00,%d0
>> 3289 moveb %d0,%a0@(LCPUCTRL)
>> 3290 #endif
>> 3291 2:
>> 3292 func_return set_leds
>> 3293 #endif
>> 3294
>> 3295 #ifdef CONSOLE_DEBUG
>> 3296 /*
>> 3297 * For continuity, see the data alignment
>> 3298 * to which this structure is tied.
>> 3299 */
>> 3300 #define Lconsole_struct_cur_column 0
>> 3301 #define Lconsole_struct_cur_row 4
>> 3302 #define Lconsole_struct_num_columns 8
>> 3303 #define Lconsole_struct_num_rows 12
>> 3304 #define Lconsole_struct_left_edge 16
>> 3305
>> 3306 func_start console_init,%a0-%a4/%d0-%d7
>> 3307 /*
>> 3308 * Some of the register usage that follows
>> 3309 * a0 = pointer to boot_info
>> 3310 * a1 = pointer to screen
>> 3311 * a2 = pointer to console_globals
>> 3312 * d3 = pixel width of screen
>> 3313 * d4 = pixel height of screen
>> 3314 * (d3,d4) ~= (x,y) of a point just below
>> 3315 * and to the right of the screen
>> 3316 * NOT on the screen!
>> 3317 * d5 = number of bytes per scan line
>> 3318 * d6 = number of bytes on the entire screen
>> 3319 */
>> 3320
>> 3321 lea %pc@(L(console_globals)),%a2
>> 3322 movel %pc@(L(mac_videobase)),%a1
>> 3323 movel %pc@(L(mac_rowbytes)),%d5
>> 3324 movel %pc@(L(mac_dimensions)),%d3 /* -> low byte */
>> 3325 movel %d3,%d4
>> 3326 swap %d4 /* -> high byte */
>> 3327 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3328 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3329
>> 3330 movel %d5,%d6
>> 3331 | subl #20,%d6
>> 3332 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3333 divul #8,%d6 /* we'll clear 8 bytes at a time */
>> 3334 moveq #-1,%d0 /* Mac_black */
>> 3335 subq #1,%d6
>> 3336
>> 3337 L(console_clear_loop):
>> 3338 movel %d0,%a1@+
>> 3339 movel %d0,%a1@+
>> 3340 dbra %d6,L(console_clear_loop)
>> 3341
>> 3342 /* Calculate font size */
>> 3343
>> 3344 #if defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
>> 3345 lea %pc@(font_vga_8x8),%a0
>> 3346 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
>> 3347 lea %pc@(font_vga_8x16),%a0
>> 3348 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
>> 3349 lea %pc@(font_vga_6x11),%a0
>> 3350 #elif defined(CONFIG_FONT_8x8) /* default */
>> 3351 lea %pc@(font_vga_8x8),%a0
>> 3352 #else /* no compiled-in font */
>> 3353 lea 0,%a0
>> 3354 #endif
>> 3355
>> 3356 /*
>> 3357 * At this point we make a shift in register usage
>> 3358 * a1 = address of console_font pointer
>> 3359 */
>> 3360 lea %pc@(L(console_font)),%a1
>> 3361 movel %a0,%a1@ /* store pointer to struct fbcon_font_desc in console_font */
>> 3362 tstl %a0
>> 3363 jeq 1f
>> 3364 lea %pc@(L(console_font_data)),%a4
>> 3365 movel %a0@(FONT_DESC_DATA),%d0
>> 3366 subl #L(console_font),%a1
>> 3367 addl %a1,%d0
>> 3368 movel %d0,%a4@
>> 3369
>> 3370 /*
>> 3371 * Calculate global maxs
>> 3372 * Note - we can use either an
>> 3373 * 8 x 16 or 8 x 8 character font
>> 3374 * 6 x 11 also supported
>> 3375 */
>> 3376 /* ASSERT: a0 = contents of Lconsole_font */
>> 3377 movel %d3,%d0 /* screen width in pixels */
>> 3378 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */
>> 3379
>> 3380 movel %d4,%d1 /* screen height in pixels */
>> 3381 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */
>> 3382
>> 3383 movel %d0,%a2@(Lconsole_struct_num_columns)
>> 3384 movel %d1,%a2@(Lconsole_struct_num_rows)
>> 3385
>> 3386 /*
>> 3387 * Clear the current row and column
>> 3388 */
>> 3389 clrl %a2@(Lconsole_struct_cur_column)
>> 3390 clrl %a2@(Lconsole_struct_cur_row)
>> 3391 clrl %a2@(Lconsole_struct_left_edge)
>> 3392
>> 3393 /*
>> 3394 * Initialization is complete
>> 3395 */
>> 3396 1:
>> 3397 func_return console_init
>> 3398
>> 3399 #ifdef CONFIG_LOGO
>> 3400 func_start console_put_penguin,%a0-%a1/%d0-%d7
>> 3401 /*
>> 3402 * Get 'that_penguin' onto the screen in the upper right corner
>> 3403 * penguin is 64 x 74 pixels, align against right edge of screen
>> 3404 */
>> 3405 lea %pc@(L(mac_dimensions)),%a0
>> 3406 movel %a0@,%d0
>> 3407 andil #0xffff,%d0
>> 3408 subil #64,%d0 /* snug up against the right edge */
>> 3409 clrl %d1 /* start at the top */
>> 3410 movel #73,%d7
>> 3411 lea %pc@(L(that_penguin)),%a1
>> 3412 L(console_penguin_row):
>> 3413 movel #31,%d6
>> 3414 L(console_penguin_pixel_pair):
>> 3415 moveb %a1@,%d2
>> 3416 lsrb #4,%d2
>> 3417 console_plot_pixel %d0,%d1,%d2
>> 3418 addq #1,%d0
>> 3419 moveb %a1@+,%d2
>> 3420 console_plot_pixel %d0,%d1,%d2
>> 3421 addq #1,%d0
>> 3422 dbra %d6,L(console_penguin_pixel_pair)
>> 3423
>> 3424 subil #64,%d0
>> 3425 addq #1,%d1
>> 3426 dbra %d7,L(console_penguin_row)
>> 3427
>> 3428 func_return console_put_penguin
>> 3429
>> 3430 /* include penguin bitmap */
>> 3431 L(that_penguin):
>> 3432 #include "../mac/mac_penguin.S"
>> 3433 #endif
>> 3434
>> 3435 /*
>> 3436 * Calculate source and destination addresses
>> 3437 * output a1 = dest
>> 3438 * a2 = source
>> 3439 */
>> 3440
>> 3441 func_start console_scroll,%a0-%a4/%d0-%d7
>> 3442 lea %pc@(L(mac_videobase)),%a0
>> 3443 movel %a0@,%a1
>> 3444 movel %a1,%a2
>> 3445 lea %pc@(L(mac_rowbytes)),%a0
>> 3446 movel %a0@,%d5
>> 3447 movel %pc@(L(console_font)),%a0
>> 3448 tstl %a0
>> 3449 jeq 1f
>> 3450 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */
>> 3451 addal %d5,%a2
>> 3452
>> 3453 /*
>> 3454 * Get dimensions
>> 3455 */
>> 3456 lea %pc@(L(mac_dimensions)),%a0
>> 3457 movel %a0@,%d3
>> 3458 movel %d3,%d4
>> 3459 swap %d4
>> 3460 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3461 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3462
>> 3463 /*
>> 3464 * Calculate number of bytes to move
>> 3465 */
>> 3466 lea %pc@(L(mac_rowbytes)),%a0
>> 3467 movel %a0@,%d6
>> 3468 movel %pc@(L(console_font)),%a0
>> 3469 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */
>> 3470 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3471 divul #32,%d6 /* we'll move 8 longs at a time */
>> 3472 subq #1,%d6
>> 3473
>> 3474 L(console_scroll_loop):
>> 3475 movel %a2@+,%a1@+
>> 3476 movel %a2@+,%a1@+
>> 3477 movel %a2@+,%a1@+
>> 3478 movel %a2@+,%a1@+
>> 3479 movel %a2@+,%a1@+
>> 3480 movel %a2@+,%a1@+
>> 3481 movel %a2@+,%a1@+
>> 3482 movel %a2@+,%a1@+
>> 3483 dbra %d6,L(console_scroll_loop)
>> 3484
>> 3485 lea %pc@(L(mac_rowbytes)),%a0
>> 3486 movel %a0@,%d6
>> 3487 movel %pc@(L(console_font)),%a0
>> 3488 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */
>> 3489 divul #32,%d6 /* we'll move 8 words at a time */
>> 3490 subq #1,%d6
>> 3491
>> 3492 moveq #-1,%d0
>> 3493 L(console_scroll_clear_loop):
>> 3494 movel %d0,%a1@+
>> 3495 movel %d0,%a1@+
>> 3496 movel %d0,%a1@+
>> 3497 movel %d0,%a1@+
>> 3498 movel %d0,%a1@+
>> 3499 movel %d0,%a1@+
>> 3500 movel %d0,%a1@+
>> 3501 movel %d0,%a1@+
>> 3502 dbra %d6,L(console_scroll_clear_loop)
>> 3503
>> 3504 1:
>> 3505 func_return console_scroll
>> 3506
>> 3507
>> 3508 func_start console_putc,%a0/%a1/%d0-%d7
>> 3509
>> 3510 is_not_mac(L(console_exit))
>> 3511 tstl %pc@(L(console_font))
>> 3512 jeq L(console_exit)
>> 3513
>> 3514 /* Output character in d7 on console.
>> 3515 */
>> 3516 movel ARG1,%d7
>> 3517 cmpib #'\n',%d7
>> 3518 jbne 1f
>> 3519
>> 3520 /* A little safe recursion is good for the soul */
>> 3521 console_putc #'\r'
>> 3522 1:
>> 3523 lea %pc@(L(console_globals)),%a0
>> 3524
>> 3525 cmpib #10,%d7
>> 3526 jne L(console_not_lf)
>> 3527 movel %a0@(Lconsole_struct_cur_row),%d0
>> 3528 addil #1,%d0
>> 3529 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3530 movel %a0@(Lconsole_struct_num_rows),%d1
>> 3531 cmpl %d1,%d0
>> 3532 jcs 1f
>> 3533 subil #1,%d0
>> 3534 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3535 console_scroll
>> 3536 1:
>> 3537 jra L(console_exit)
>> 3538
>> 3539 L(console_not_lf):
>> 3540 cmpib #13,%d7
>> 3541 jne L(console_not_cr)
>> 3542 clrl %a0@(Lconsole_struct_cur_column)
>> 3543 jra L(console_exit)
>> 3544
>> 3545 L(console_not_cr):
>> 3546 cmpib #1,%d7
>> 3547 jne L(console_not_home)
>> 3548 clrl %a0@(Lconsole_struct_cur_row)
>> 3549 clrl %a0@(Lconsole_struct_cur_column)
>> 3550 jra L(console_exit)
>> 3551
>> 3552 /*
>> 3553 * At this point we know that the %d7 character is going to be
>> 3554 * rendered on the screen. Register usage is -
>> 3555 * a0 = pointer to console globals
>> 3556 * a1 = font data
>> 3557 * d0 = cursor column
>> 3558 * d1 = cursor row to draw the character
>> 3559 * d7 = character number
>> 3560 */
>> 3561 L(console_not_home):
>> 3562 movel %a0@(Lconsole_struct_cur_column),%d0
>> 3563 addql #1,%a0@(Lconsole_struct_cur_column)
>> 3564 movel %a0@(Lconsole_struct_num_columns),%d1
>> 3565 cmpl %d1,%d0
>> 3566 jcs 1f
>> 3567 console_putc #'\n' /* recursion is OK! */
>> 3568 1:
>> 3569 movel %a0@(Lconsole_struct_cur_row),%d1
>> 3570
>> 3571 /*
>> 3572 * At this point we make a shift in register usage
>> 3573 * a0 = address of pointer to font data (fbcon_font_desc)
>> 3574 */
>> 3575 movel %pc@(L(console_font)),%a0
>> 3576 movel %pc@(L(console_font_data)),%a1 /* Load fbcon_font_desc.data into a1 */
>> 3577 andl #0x000000ff,%d7
>> 3578 /* ASSERT: a0 = contents of Lconsole_font */
>> 3579 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */
>> 3580 addl %d7,%a1 /* a1 = points to char image */
>> 3581
>> 3582 /*
>> 3583 * At this point we make a shift in register usage
>> 3584 * d0 = pixel coordinate, x
>> 3585 * d1 = pixel coordinate, y
>> 3586 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen
>> 3587 * d3 = font scan line data (8 pixels)
>> 3588 * d6 = count down for the font's pixel width (8)
>> 3589 * d7 = count down for the font's pixel count in height
>> 3590 */
>> 3591 /* ASSERT: a0 = contents of Lconsole_font */
>> 3592 mulul %a0@(FONT_DESC_WIDTH),%d0
>> 3593 mulul %a0@(FONT_DESC_HEIGHT),%d1
>> 3594 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load fbcon_font_desc.height into d7 */
>> 3595 subq #1,%d7
>> 3596 L(console_read_char_scanline):
>> 3597 moveb %a1@+,%d3
>> 3598
>> 3599 /* ASSERT: a0 = contents of Lconsole_font */
>> 3600 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */
>> 3601 subql #1,%d6
>> 3602
>> 3603 L(console_do_font_scanline):
>> 3604 lslb #1,%d3
>> 3605 scsb %d2 /* convert 1 bit into a byte */
>> 3606 console_plot_pixel %d0,%d1,%d2
>> 3607 addq #1,%d0
>> 3608 dbra %d6,L(console_do_font_scanline)
>> 3609
>> 3610 /* ASSERT: a0 = contents of Lconsole_font */
>> 3611 subl %a0@(FONT_DESC_WIDTH),%d0
>> 3612 addq #1,%d1
>> 3613 dbra %d7,L(console_read_char_scanline)
>> 3614
>> 3615 L(console_exit):
>> 3616 func_return console_putc
>> 3617
>> 3618 /*
>> 3619 * Input:
>> 3620 * d0 = x coordinate
>> 3621 * d1 = y coordinate
>> 3622 * d2 = (bit 0) 1/0 for white/black (!)
>> 3623 * All registers are preserved
>> 3624 */
>> 3625 func_start console_plot_pixel,%a0-%a1/%d0-%d4
>> 3626
>> 3627 movel %pc@(L(mac_videobase)),%a1
>> 3628 movel %pc@(L(mac_videodepth)),%d3
>> 3629 movel ARG1,%d0
>> 3630 movel ARG2,%d1
>> 3631 mulul %pc@(L(mac_rowbytes)),%d1
>> 3632 movel ARG3,%d2
>> 3633
>> 3634 /*
>> 3635 * Register usage:
>> 3636 * d0 = x coord becomes byte offset into frame buffer
>> 3637 * d1 = y coord
>> 3638 * d2 = black or white (0/1)
>> 3639 * d3 = video depth
>> 3640 * d4 = temp of x (d0) for many bit depths
>> 3641 */
>> 3642 L(test_1bit):
>> 3643 cmpb #1,%d3
>> 3644 jbne L(test_2bit)
>> 3645 movel %d0,%d4 /* we need the low order 3 bits! */
>> 3646 divul #8,%d0
>> 3647 addal %d0,%a1
>> 3648 addal %d1,%a1
>> 3649 andb #7,%d4
>> 3650 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3651 andb #1,%d2
>> 3652 jbne L(white_1)
>> 3653 bsetb %d4,%a1@
>> 3654 jbra L(console_plot_pixel_exit)
>> 3655 L(white_1):
>> 3656 bclrb %d4,%a1@
>> 3657 jbra L(console_plot_pixel_exit)
>> 3658
>> 3659 L(test_2bit):
>> 3660 cmpb #2,%d3
>> 3661 jbne L(test_4bit)
>> 3662 movel %d0,%d4 /* we need the low order 2 bits! */
>> 3663 divul #4,%d0
>> 3664 addal %d0,%a1
>> 3665 addal %d1,%a1
>> 3666 andb #3,%d4
>> 3667 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3668 lsll #1,%d4 /* ! */
>> 3669 andb #1,%d2
>> 3670 jbne L(white_2)
>> 3671 bsetb %d4,%a1@
>> 3672 addq #1,%d4
>> 3673 bsetb %d4,%a1@
>> 3674 jbra L(console_plot_pixel_exit)
>> 3675 L(white_2):
>> 3676 bclrb %d4,%a1@
>> 3677 addq #1,%d4
>> 3678 bclrb %d4,%a1@
>> 3679 jbra L(console_plot_pixel_exit)
>> 3680
>> 3681 L(test_4bit):
>> 3682 cmpb #4,%d3
>> 3683 jbne L(test_8bit)
>> 3684 movel %d0,%d4 /* we need the low order bit! */
>> 3685 divul #2,%d0
>> 3686 addal %d0,%a1
>> 3687 addal %d1,%a1
>> 3688 andb #1,%d4
>> 3689 eorb #1,%d4
>> 3690 lsll #2,%d4 /* ! */
>> 3691 andb #1,%d2
>> 3692 jbne L(white_4)
>> 3693 bsetb %d4,%a1@
>> 3694 addq #1,%d4
>> 3695 bsetb %d4,%a1@
>> 3696 addq #1,%d4
>> 3697 bsetb %d4,%a1@
>> 3698 addq #1,%d4
>> 3699 bsetb %d4,%a1@
>> 3700 jbra L(console_plot_pixel_exit)
>> 3701 L(white_4):
>> 3702 bclrb %d4,%a1@
>> 3703 addq #1,%d4
>> 3704 bclrb %d4,%a1@
>> 3705 addq #1,%d4
>> 3706 bclrb %d4,%a1@
>> 3707 addq #1,%d4
>> 3708 bclrb %d4,%a1@
>> 3709 jbra L(console_plot_pixel_exit)
>> 3710
>> 3711 L(test_8bit):
>> 3712 cmpb #8,%d3
>> 3713 jbne L(test_16bit)
>> 3714 addal %d0,%a1
>> 3715 addal %d1,%a1
>> 3716 andb #1,%d2
>> 3717 jbne L(white_8)
>> 3718 moveb #0xff,%a1@
>> 3719 jbra L(console_plot_pixel_exit)
>> 3720 L(white_8):
>> 3721 clrb %a1@
>> 3722 jbra L(console_plot_pixel_exit)
>> 3723
>> 3724 L(test_16bit):
>> 3725 cmpb #16,%d3
>> 3726 jbne L(console_plot_pixel_exit)
>> 3727 addal %d0,%a1
>> 3728 addal %d0,%a1
>> 3729 addal %d1,%a1
>> 3730 andb #1,%d2
>> 3731 jbne L(white_16)
>> 3732 clrw %a1@
>> 3733 jbra L(console_plot_pixel_exit)
>> 3734 L(white_16):
>> 3735 movew #0x0fff,%a1@
>> 3736 jbra L(console_plot_pixel_exit)
>> 3737
>> 3738 L(console_plot_pixel_exit):
>> 3739 func_return console_plot_pixel
>> 3740 #endif /* CONSOLE_DEBUG */
>> 3741
>> 3742
>> 3743 __INITDATA
>> 3744 .align 4
>> 3745
>> 3746 m68k_init_mapped_size:
>> 3747 .long 0
>> 3748
>> 3749 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
>> 3750 defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3751 L(custom):
>> 3752 L(iobase):
>> 3753 .long 0
>> 3754 #endif
>> 3755
>> 3756 #ifdef CONSOLE_DEBUG
>> 3757 L(console_globals):
>> 3758 .long 0 /* cursor column */
>> 3759 .long 0 /* cursor row */
>> 3760 .long 0 /* max num columns */
>> 3761 .long 0 /* max num rows */
>> 3762 .long 0 /* left edge */
>> 3763 L(console_font):
>> 3764 .long 0 /* pointer to console font (struct font_desc) */
>> 3765 L(console_font_data):
>> 3766 .long 0 /* pointer to console font data */
>> 3767 #endif /* CONSOLE_DEBUG */
>> 3768
>> 3769 #if defined(MMU_PRINT)
>> 3770 L(mmu_print_data):
>> 3771 .long 0 /* valid flag */
>> 3772 .long 0 /* start logical */
>> 3773 .long 0 /* next logical */
>> 3774 .long 0 /* start physical */
>> 3775 .long 0 /* next physical */
>> 3776 #endif /* MMU_PRINT */
>> 3777
>> 3778 L(cputype):
>> 3779 .long 0
>> 3780 L(mmu_cached_pointer_tables):
>> 3781 .long 0
>> 3782 L(mmu_num_pointer_tables):
>> 3783 .long 0
>> 3784 L(phys_kernel_start):
>> 3785 .long 0
>> 3786 L(kernel_end):
>> 3787 .long 0
>> 3788 L(memory_start):
>> 3789 .long 0
>> 3790 L(kernel_pgdir_ptr):
>> 3791 .long 0
>> 3792 L(temp_mmap_mem):
>> 3793 .long 0
>> 3794
>> 3795 #if defined (CONFIG_MVME147)
>> 3796 M147_SCC_CTRL_A = 0xfffe3002
>> 3797 M147_SCC_DATA_A = 0xfffe3003
>> 3798 #endif
>> 3799
>> 3800 #if defined (CONFIG_MVME16x)
>> 3801 M162_SCC_CTRL_A = 0xfff45005
>> 3802 M167_CYCAR = 0xfff450ee
>> 3803 M167_CYIER = 0xfff45011
>> 3804 M167_CYLICR = 0xfff45026
>> 3805 M167_CYTEOIR = 0xfff45085
>> 3806 M167_CYTDR = 0xfff450f8
>> 3807 M167_PCSCCMICR = 0xfff4201d
>> 3808 M167_PCSCCTICR = 0xfff4201e
>> 3809 M167_PCSCCRICR = 0xfff4201f
>> 3810 M167_PCTPIACKR = 0xfff42025
>> 3811 #endif
>> 3812
>> 3813 #if defined (CONFIG_BVME6000)
>> 3814 BVME_SCC_CTRL_A = 0xffb0000b
>> 3815 BVME_SCC_DATA_A = 0xffb0000f
>> 3816 #endif
>> 3817
>> 3818 #if defined(CONFIG_MAC)
>> 3819 L(mac_videobase):
>> 3820 .long 0
>> 3821 L(mac_videodepth):
>> 3822 .long 0
>> 3823 L(mac_dimensions):
>> 3824 .long 0
>> 3825 L(mac_rowbytes):
>> 3826 .long 0
>> 3827 L(mac_sccbase):
>> 3828 .long 0
>> 3829 #endif /* CONFIG_MAC */
>> 3830
>> 3831 #if defined (CONFIG_APOLLO)
>> 3832 LSRB0 = 0x10412
>> 3833 LTHRB0 = 0x10416
>> 3834 LCPUCTRL = 0x10100
>> 3835 #endif
>> 3836
>> 3837 #if defined(CONFIG_HP300)
>> 3838 DCADATA = 0x11
>> 3839 DCALSR = 0x1b
>> 3840 APCIDATA = 0x00
>> 3841 APCILSR = 0x14
>> 3842 L(uartbase):
>> 3843 .long 0
>> 3844 L(uart_scode):
>> 3845 .long -1
>> 3846 #endif
>> 3847
>> 3848 __FINIT
>> 3849 .data
>> 3850 .align 4
>> 3851
>> 3852 availmem:
>> 3853 .long 0
>> 3854 m68k_pgtable_cachemode:
>> 3855 .long 0
>> 3856 m68k_supervisor_cachemode:
>> 3857 .long 0
>> 3858 #if defined(CONFIG_MVME16x)
>> 3859 mvme_bdid:
>> 3860 .long 0,0,0,0,0,0,0,0
>> 3861 #endif
>> 3862 #if defined(CONFIG_Q40)
>> 3863 q40_mem_cptr:
>> 3864 .long 0
>> 3865 L(q40_do_debug):
>> 3866 .long 0
173 #endif 3867 #endif
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