wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> |
| 3 | * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> |
| 4 | * Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de> |
| 5 | * Copyright (C) 2001 Josh Huber <huber@mclx.com> |
| 6 | * |
| 7 | * See file CREDITS for list of people who contributed to this |
| 8 | * project. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation; either version 2 of |
| 13 | * the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 23 | * MA 02111-1307 USA |
| 24 | */ |
| 25 | |
| 26 | /* U-Boot - Startup Code for PowerPC based Embedded Boards |
| 27 | * |
| 28 | * |
| 29 | * The processor starts at 0xfff00100 and the code is executed |
| 30 | * from flash. The code is organized to be at an other address |
| 31 | * in memory, but as long we don't jump around before relocating. |
| 32 | * board_init lies at a quite high address and when the cpu has |
| 33 | * jumped there, everything is ok. |
| 34 | */ |
| 35 | #include <config.h> |
| 36 | #include <74xx_7xx.h> |
| 37 | #include <version.h> |
| 38 | |
| 39 | #include <ppc_asm.tmpl> |
| 40 | #include <ppc_defs.h> |
| 41 | |
| 42 | #include <asm/cache.h> |
| 43 | #include <asm/mmu.h> |
| 44 | |
| 45 | #include <galileo/gt64260R.h> |
| 46 | |
| 47 | #ifndef CONFIG_IDENT_STRING |
| 48 | #define CONFIG_IDENT_STRING "" |
| 49 | #endif |
| 50 | |
| 51 | /* We don't want the MMU yet. |
| 52 | */ |
| 53 | #undef MSR_KERNEL |
| 54 | /* Machine Check and Recoverable Interr. */ |
| 55 | #define MSR_KERNEL ( MSR_ME | MSR_RI ) |
| 56 | |
| 57 | /* |
| 58 | * Set up GOT: Global Offset Table |
| 59 | * |
| 60 | * Use r14 to access the GOT |
| 61 | */ |
| 62 | START_GOT |
| 63 | GOT_ENTRY(_GOT2_TABLE_) |
| 64 | GOT_ENTRY(_FIXUP_TABLE_) |
| 65 | |
| 66 | GOT_ENTRY(_start) |
| 67 | GOT_ENTRY(_start_of_vectors) |
| 68 | GOT_ENTRY(_end_of_vectors) |
| 69 | GOT_ENTRY(transfer_to_handler) |
| 70 | |
wdenk | 3b57fe0 | 2003-05-30 12:48:29 +0000 | [diff] [blame] | 71 | GOT_ENTRY(__init_end) |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 72 | GOT_ENTRY(_end) |
wdenk | 5d232d0 | 2003-05-22 22:52:13 +0000 | [diff] [blame] | 73 | GOT_ENTRY(__bss_start) |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 74 | END_GOT |
| 75 | |
| 76 | /* |
| 77 | * r3 - 1st arg to board_init(): IMMP pointer |
| 78 | * r4 - 2nd arg to board_init(): boot flag |
| 79 | */ |
| 80 | .text |
| 81 | .long 0x27051956 /* U-Boot Magic Number */ |
| 82 | .globl version_string |
| 83 | version_string: |
| 84 | .ascii U_BOOT_VERSION |
| 85 | .ascii " (", __DATE__, " - ", __TIME__, ")" |
| 86 | .ascii CONFIG_IDENT_STRING, "\0" |
| 87 | |
| 88 | . = EXC_OFF_SYS_RESET |
| 89 | .globl _start |
| 90 | _start: |
| 91 | li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */ |
| 92 | b boot_cold |
| 93 | sync |
| 94 | |
| 95 | . = EXC_OFF_SYS_RESET + 0x10 |
| 96 | |
| 97 | .globl _start_warm |
| 98 | _start_warm: |
| 99 | li r21, BOOTFLAG_WARM /* Software reboot */ |
| 100 | b boot_warm |
| 101 | sync |
| 102 | |
| 103 | /* the boot code is located below the exception table */ |
| 104 | |
| 105 | .globl _start_of_vectors |
| 106 | _start_of_vectors: |
| 107 | |
| 108 | /* Machine check */ |
| 109 | STD_EXCEPTION(0x200, MachineCheck, MachineCheckException) |
| 110 | |
| 111 | /* Data Storage exception. "Never" generated on the 860. */ |
| 112 | STD_EXCEPTION(0x300, DataStorage, UnknownException) |
| 113 | |
| 114 | /* Instruction Storage exception. "Never" generated on the 860. */ |
| 115 | STD_EXCEPTION(0x400, InstStorage, UnknownException) |
| 116 | |
| 117 | /* External Interrupt exception. */ |
| 118 | STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt) |
| 119 | |
| 120 | /* Alignment exception. */ |
| 121 | . = 0x600 |
| 122 | Alignment: |
| 123 | EXCEPTION_PROLOG |
| 124 | mfspr r4,DAR |
| 125 | stw r4,_DAR(r21) |
| 126 | mfspr r5,DSISR |
| 127 | stw r5,_DSISR(r21) |
| 128 | addi r3,r1,STACK_FRAME_OVERHEAD |
| 129 | li r20,MSR_KERNEL |
| 130 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ |
| 131 | lwz r6,GOT(transfer_to_handler) |
| 132 | mtlr r6 |
| 133 | blrl |
| 134 | .L_Alignment: |
| 135 | .long AlignmentException - _start + EXC_OFF_SYS_RESET |
| 136 | .long int_return - _start + EXC_OFF_SYS_RESET |
| 137 | |
| 138 | /* Program check exception */ |
| 139 | . = 0x700 |
| 140 | ProgramCheck: |
| 141 | EXCEPTION_PROLOG |
| 142 | addi r3,r1,STACK_FRAME_OVERHEAD |
| 143 | li r20,MSR_KERNEL |
| 144 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ |
| 145 | lwz r6,GOT(transfer_to_handler) |
| 146 | mtlr r6 |
| 147 | blrl |
| 148 | .L_ProgramCheck: |
| 149 | .long ProgramCheckException - _start + EXC_OFF_SYS_RESET |
| 150 | .long int_return - _start + EXC_OFF_SYS_RESET |
| 151 | |
| 152 | /* No FPU on MPC8xx. This exception is not supposed to happen. |
| 153 | */ |
| 154 | STD_EXCEPTION(0x800, FPUnavailable, UnknownException) |
| 155 | |
| 156 | /* I guess we could implement decrementer, and may have |
| 157 | * to someday for timekeeping. |
| 158 | */ |
| 159 | STD_EXCEPTION(0x900, Decrementer, timer_interrupt) |
| 160 | STD_EXCEPTION(0xa00, Trap_0a, UnknownException) |
| 161 | STD_EXCEPTION(0xb00, Trap_0b, UnknownException) |
| 162 | |
| 163 | . = 0xc00 |
| 164 | /* |
| 165 | * r0 - SYSCALL number |
| 166 | * r3-... arguments |
| 167 | */ |
| 168 | SystemCall: |
| 169 | addis r11,r0,0 /* get functions table addr */ |
| 170 | ori r11,r11,0 /* Note: this code is patched in trap_init */ |
| 171 | addis r12,r0,0 /* get number of functions */ |
| 172 | ori r12,r12,0 |
| 173 | |
| 174 | cmplw 0, r0, r12 |
| 175 | bge 1f |
| 176 | |
| 177 | rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */ |
| 178 | add r11,r11,r0 |
| 179 | lwz r11,0(r11) |
| 180 | |
wdenk | 7c7a23b | 2002-12-07 00:20:59 +0000 | [diff] [blame] | 181 | li r20,0xd00-4 /* Get stack pointer */ |
| 182 | lwz r12,0(r20) |
| 183 | subi r12,r12,12 /* Adjust stack pointer */ |
| 184 | li r0,0xc00+_end_back-SystemCall |
| 185 | cmplw 0, r0, r12 /* Check stack overflow */ |
| 186 | bgt 1f |
| 187 | stw r12,0(r20) |
| 188 | |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 189 | mflr r0 |
| 190 | stw r0,0(r12) |
| 191 | mfspr r0,SRR0 |
| 192 | stw r0,4(r12) |
| 193 | mfspr r0,SRR1 |
| 194 | stw r0,8(r12) |
| 195 | |
| 196 | li r12,0xc00+_back-SystemCall |
| 197 | mtlr r12 |
| 198 | mtspr SRR0,r11 |
| 199 | |
| 200 | 1: SYNC |
| 201 | rfi |
| 202 | |
| 203 | _back: |
| 204 | |
| 205 | mfmsr r11 /* Disable interrupts */ |
| 206 | li r12,0 |
| 207 | ori r12,r12,MSR_EE |
| 208 | andc r11,r11,r12 |
| 209 | SYNC /* Some chip revs need this... */ |
| 210 | mtmsr r11 |
| 211 | SYNC |
| 212 | |
wdenk | 7c7a23b | 2002-12-07 00:20:59 +0000 | [diff] [blame] | 213 | li r12,0xd00-4 /* restore regs */ |
| 214 | lwz r12,0(r12) |
| 215 | |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 216 | lwz r11,0(r12) |
| 217 | mtlr r11 |
| 218 | lwz r11,4(r12) |
| 219 | mtspr SRR0,r11 |
| 220 | lwz r11,8(r12) |
| 221 | mtspr SRR1,r11 |
| 222 | |
wdenk | 7c7a23b | 2002-12-07 00:20:59 +0000 | [diff] [blame] | 223 | addi r12,r12,12 /* Adjust stack pointer */ |
| 224 | li r20,0xd00-4 |
| 225 | stw r12,0(r20) |
| 226 | |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 227 | SYNC |
| 228 | rfi |
wdenk | 7c7a23b | 2002-12-07 00:20:59 +0000 | [diff] [blame] | 229 | _end_back: |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 230 | |
| 231 | STD_EXCEPTION(0xd00, SingleStep, UnknownException) |
| 232 | |
| 233 | STD_EXCEPTION(0xe00, Trap_0e, UnknownException) |
| 234 | STD_EXCEPTION(0xf00, Trap_0f, UnknownException) |
| 235 | |
| 236 | /* |
| 237 | * On the MPC8xx, this is a software emulation interrupt. It |
| 238 | * occurs for all unimplemented and illegal instructions. |
| 239 | */ |
| 240 | STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException) |
| 241 | |
| 242 | STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException) |
| 243 | STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException) |
| 244 | STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException) |
| 245 | STD_EXCEPTION(0x1400, DataTLBError, UnknownException) |
| 246 | |
| 247 | STD_EXCEPTION(0x1500, Reserved5, UnknownException) |
| 248 | STD_EXCEPTION(0x1600, Reserved6, UnknownException) |
| 249 | STD_EXCEPTION(0x1700, Reserved7, UnknownException) |
| 250 | STD_EXCEPTION(0x1800, Reserved8, UnknownException) |
| 251 | STD_EXCEPTION(0x1900, Reserved9, UnknownException) |
| 252 | STD_EXCEPTION(0x1a00, ReservedA, UnknownException) |
| 253 | STD_EXCEPTION(0x1b00, ReservedB, UnknownException) |
| 254 | |
| 255 | STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException) |
| 256 | STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException) |
| 257 | STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException) |
| 258 | STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException) |
| 259 | |
| 260 | .globl _end_of_vectors |
| 261 | _end_of_vectors: |
| 262 | |
| 263 | . = 0x2000 |
| 264 | |
| 265 | boot_cold: |
| 266 | boot_warm: |
| 267 | /* disable everything */ |
| 268 | li r0, 0 |
| 269 | mtspr HID0, r0 |
| 270 | sync |
| 271 | mtmsr 0 |
| 272 | bl invalidate_bats |
| 273 | sync |
| 274 | |
| 275 | #ifdef CFG_L2 |
| 276 | /* init the L2 cache */ |
| 277 | addis r3, r0, L2_INIT@h |
| 278 | ori r3, r3, L2_INIT@l |
| 279 | sync |
| 280 | mtspr l2cr, r3 |
| 281 | #endif |
| 282 | #if defined(CONFIG_ALTIVEC) && defined(CONFIG_74xx) |
| 283 | .long 0x7e00066c |
| 284 | /* |
| 285 | * dssall instruction, gas doesn't have it yet |
| 286 | * ...for altivec, data stream stop all this probably |
| 287 | * isn't needed unless we warm (software) reboot U-Boot |
| 288 | */ |
| 289 | #endif |
| 290 | |
| 291 | #ifdef CFG_L2 |
| 292 | /* invalidate the L2 cache */ |
| 293 | bl l2cache_invalidate |
| 294 | sync |
| 295 | #endif |
| 296 | #ifdef CFG_BOARD_ASM_INIT |
| 297 | /* do early init */ |
| 298 | bl board_asm_init |
| 299 | #endif |
| 300 | |
| 301 | /* |
| 302 | * Calculate absolute address in FLASH and jump there |
| 303 | *------------------------------------------------------*/ |
| 304 | lis r3, CFG_MONITOR_BASE@h |
| 305 | ori r3, r3, CFG_MONITOR_BASE@l |
| 306 | addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET |
| 307 | mtlr r3 |
| 308 | blr |
| 309 | |
| 310 | in_flash: |
| 311 | /* let the C-code set up the rest */ |
| 312 | /* */ |
| 313 | /* Be careful to keep code relocatable ! */ |
| 314 | /*------------------------------------------------------*/ |
| 315 | |
| 316 | /* perform low-level init */ |
| 317 | /* sdram init, galileo init, etc */ |
| 318 | /* r3: NHR bit from HID0 */ |
| 319 | |
| 320 | /* setup the bats */ |
| 321 | bl setup_bats |
| 322 | sync |
| 323 | |
| 324 | /* |
| 325 | * Cache must be enabled here for stack-in-cache trick. |
| 326 | * This means we need to enable the BATS. |
| 327 | * This means: |
| 328 | * 1) for the EVB, original gt regs need to be mapped |
| 329 | * 2) need to have an IBAT for the 0xf region, |
| 330 | * we are running there! |
| 331 | * Cache should be turned on after BATs, since by default |
| 332 | * everything is write-through. |
| 333 | * The init-mem BAT can be reused after reloc. The old |
| 334 | * gt-regs BAT can be reused after board_init_f calls |
| 335 | * board_pre_init (EVB only). |
| 336 | */ |
| 337 | #if !defined(CONFIG_BAB7xx) && !defined(CONFIG_ELPPC) |
| 338 | /* enable address translation */ |
| 339 | bl enable_addr_trans |
| 340 | sync |
| 341 | |
| 342 | /* enable and invalidate the data cache */ |
| 343 | bl l1dcache_enable |
| 344 | sync |
| 345 | #endif |
| 346 | #ifdef CFG_INIT_RAM_LOCK |
| 347 | bl lock_ram_in_cache |
| 348 | sync |
| 349 | #endif |
| 350 | |
| 351 | /* set up the stack pointer in our newly created |
| 352 | * cache-ram (r1) */ |
| 353 | lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h |
| 354 | ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l |
| 355 | |
| 356 | li r0, 0 /* Make room for stack frame header and */ |
| 357 | stwu r0, -4(r1) /* clear final stack frame so that */ |
| 358 | stwu r0, -4(r1) /* stack backtraces terminate cleanly */ |
| 359 | |
| 360 | GET_GOT /* initialize GOT access */ |
| 361 | |
| 362 | /* run low-level CPU init code (from Flash) */ |
| 363 | bl cpu_init_f |
| 364 | sync |
| 365 | |
| 366 | mr r3, r21 |
| 367 | |
| 368 | /* r3: BOOTFLAG */ |
| 369 | /* run 1st part of board init code (from Flash) */ |
| 370 | bl board_init_f |
| 371 | sync |
| 372 | |
| 373 | /* NOTREACHED */ |
| 374 | |
| 375 | .globl invalidate_bats |
| 376 | invalidate_bats: |
| 377 | /* invalidate BATs */ |
| 378 | mtspr IBAT0U, r0 |
| 379 | mtspr IBAT1U, r0 |
| 380 | mtspr IBAT2U, r0 |
| 381 | mtspr IBAT3U, r0 |
| 382 | isync |
| 383 | mtspr DBAT0U, r0 |
| 384 | mtspr DBAT1U, r0 |
| 385 | mtspr DBAT2U, r0 |
| 386 | mtspr DBAT3U, r0 |
| 387 | isync |
| 388 | sync |
| 389 | blr |
| 390 | |
| 391 | /* setup_bats - set them up to some initial state */ |
| 392 | .globl setup_bats |
| 393 | setup_bats: |
| 394 | addis r0, r0, 0x0000 |
| 395 | |
| 396 | /* IBAT 0 */ |
| 397 | addis r4, r0, CFG_IBAT0L@h |
| 398 | ori r4, r4, CFG_IBAT0L@l |
| 399 | addis r3, r0, CFG_IBAT0U@h |
| 400 | ori r3, r3, CFG_IBAT0U@l |
| 401 | mtspr IBAT0L, r4 |
| 402 | mtspr IBAT0U, r3 |
| 403 | isync |
| 404 | |
| 405 | /* DBAT 0 */ |
| 406 | addis r4, r0, CFG_DBAT0L@h |
| 407 | ori r4, r4, CFG_DBAT0L@l |
| 408 | addis r3, r0, CFG_DBAT0U@h |
| 409 | ori r3, r3, CFG_DBAT0U@l |
| 410 | mtspr DBAT0L, r4 |
| 411 | mtspr DBAT0U, r3 |
| 412 | isync |
| 413 | |
| 414 | /* IBAT 1 */ |
| 415 | addis r4, r0, CFG_IBAT1L@h |
| 416 | ori r4, r4, CFG_IBAT1L@l |
| 417 | addis r3, r0, CFG_IBAT1U@h |
| 418 | ori r3, r3, CFG_IBAT1U@l |
| 419 | mtspr IBAT1L, r4 |
| 420 | mtspr IBAT1U, r3 |
| 421 | isync |
| 422 | |
| 423 | /* DBAT 1 */ |
| 424 | addis r4, r0, CFG_DBAT1L@h |
| 425 | ori r4, r4, CFG_DBAT1L@l |
| 426 | addis r3, r0, CFG_DBAT1U@h |
| 427 | ori r3, r3, CFG_DBAT1U@l |
| 428 | mtspr DBAT1L, r4 |
| 429 | mtspr DBAT1U, r3 |
| 430 | isync |
| 431 | |
| 432 | /* IBAT 2 */ |
| 433 | addis r4, r0, CFG_IBAT2L@h |
| 434 | ori r4, r4, CFG_IBAT2L@l |
| 435 | addis r3, r0, CFG_IBAT2U@h |
| 436 | ori r3, r3, CFG_IBAT2U@l |
| 437 | mtspr IBAT2L, r4 |
| 438 | mtspr IBAT2U, r3 |
| 439 | isync |
| 440 | |
| 441 | /* DBAT 2 */ |
| 442 | addis r4, r0, CFG_DBAT2L@h |
| 443 | ori r4, r4, CFG_DBAT2L@l |
| 444 | addis r3, r0, CFG_DBAT2U@h |
| 445 | ori r3, r3, CFG_DBAT2U@l |
| 446 | mtspr DBAT2L, r4 |
| 447 | mtspr DBAT2U, r3 |
| 448 | isync |
| 449 | |
| 450 | /* IBAT 3 */ |
| 451 | addis r4, r0, CFG_IBAT3L@h |
| 452 | ori r4, r4, CFG_IBAT3L@l |
| 453 | addis r3, r0, CFG_IBAT3U@h |
| 454 | ori r3, r3, CFG_IBAT3U@l |
| 455 | mtspr IBAT3L, r4 |
| 456 | mtspr IBAT3U, r3 |
| 457 | isync |
| 458 | |
| 459 | /* DBAT 3 */ |
| 460 | addis r4, r0, CFG_DBAT3L@h |
| 461 | ori r4, r4, CFG_DBAT3L@l |
| 462 | addis r3, r0, CFG_DBAT3U@h |
| 463 | ori r3, r3, CFG_DBAT3U@l |
| 464 | mtspr DBAT3L, r4 |
| 465 | mtspr DBAT3U, r3 |
| 466 | isync |
| 467 | |
| 468 | /* bats are done, now invalidate the TLBs */ |
| 469 | |
| 470 | addis r3, 0, 0x0000 |
| 471 | addis r5, 0, 0x4 /* upper bound of 0x00040000 for 7400/750 */ |
| 472 | |
| 473 | isync |
| 474 | |
| 475 | tlblp: |
| 476 | tlbie r3 |
| 477 | sync |
| 478 | addi r3, r3, 0x1000 |
| 479 | cmp 0, 0, r3, r5 |
| 480 | blt tlblp |
| 481 | |
| 482 | blr |
| 483 | |
| 484 | .globl enable_addr_trans |
| 485 | enable_addr_trans: |
| 486 | /* enable address translation */ |
| 487 | mfmsr r5 |
| 488 | ori r5, r5, (MSR_IR | MSR_DR) |
| 489 | mtmsr r5 |
| 490 | isync |
| 491 | blr |
| 492 | |
| 493 | .globl disable_addr_trans |
| 494 | disable_addr_trans: |
| 495 | /* disable address translation */ |
| 496 | mflr r4 |
| 497 | mfmsr r3 |
| 498 | andi. r0, r3, (MSR_IR | MSR_DR) |
| 499 | beqlr |
| 500 | andc r3, r3, r0 |
| 501 | mtspr SRR0, r4 |
| 502 | mtspr SRR1, r3 |
| 503 | rfi |
| 504 | |
| 505 | /* |
| 506 | * This code finishes saving the registers to the exception frame |
| 507 | * and jumps to the appropriate handler for the exception. |
| 508 | * Register r21 is pointer into trap frame, r1 has new stack pointer. |
| 509 | */ |
| 510 | .globl transfer_to_handler |
| 511 | transfer_to_handler: |
| 512 | stw r22,_NIP(r21) |
| 513 | lis r22,MSR_POW@h |
| 514 | andc r23,r23,r22 |
| 515 | stw r23,_MSR(r21) |
| 516 | SAVE_GPR(7, r21) |
| 517 | SAVE_4GPRS(8, r21) |
| 518 | SAVE_8GPRS(12, r21) |
| 519 | SAVE_8GPRS(24, r21) |
| 520 | mflr r23 |
| 521 | andi. r24,r23,0x3f00 /* get vector offset */ |
| 522 | stw r24,TRAP(r21) |
| 523 | li r22,0 |
| 524 | stw r22,RESULT(r21) |
| 525 | mtspr SPRG2,r22 /* r1 is now kernel sp */ |
| 526 | lwz r24,0(r23) /* virtual address of handler */ |
| 527 | lwz r23,4(r23) /* where to go when done */ |
| 528 | mtspr SRR0,r24 |
| 529 | mtspr SRR1,r20 |
| 530 | mtlr r23 |
| 531 | SYNC |
| 532 | rfi /* jump to handler, enable MMU */ |
| 533 | |
| 534 | int_return: |
| 535 | mfmsr r28 /* Disable interrupts */ |
| 536 | li r4,0 |
| 537 | ori r4,r4,MSR_EE |
| 538 | andc r28,r28,r4 |
| 539 | SYNC /* Some chip revs need this... */ |
| 540 | mtmsr r28 |
| 541 | SYNC |
| 542 | lwz r2,_CTR(r1) |
| 543 | lwz r0,_LINK(r1) |
| 544 | mtctr r2 |
| 545 | mtlr r0 |
| 546 | lwz r2,_XER(r1) |
| 547 | lwz r0,_CCR(r1) |
| 548 | mtspr XER,r2 |
| 549 | mtcrf 0xFF,r0 |
| 550 | REST_10GPRS(3, r1) |
| 551 | REST_10GPRS(13, r1) |
| 552 | REST_8GPRS(23, r1) |
| 553 | REST_GPR(31, r1) |
| 554 | lwz r2,_NIP(r1) /* Restore environment */ |
| 555 | lwz r0,_MSR(r1) |
| 556 | mtspr SRR0,r2 |
| 557 | mtspr SRR1,r0 |
| 558 | lwz r0,GPR0(r1) |
| 559 | lwz r2,GPR2(r1) |
| 560 | lwz r1,GPR1(r1) |
| 561 | SYNC |
| 562 | rfi |
| 563 | |
| 564 | .globl dc_read |
| 565 | dc_read: |
| 566 | blr |
| 567 | |
| 568 | .globl get_pvr |
| 569 | get_pvr: |
| 570 | mfspr r3, PVR |
| 571 | blr |
| 572 | |
| 573 | /*-----------------------------------------------------------------------*/ |
| 574 | /* |
| 575 | * void relocate_code (addr_sp, gd, addr_moni) |
| 576 | * |
| 577 | * This "function" does not return, instead it continues in RAM |
| 578 | * after relocating the monitor code. |
| 579 | * |
| 580 | * r3 = dest |
| 581 | * r4 = src |
| 582 | * r5 = length in bytes |
| 583 | * r6 = cachelinesize |
| 584 | */ |
| 585 | .globl relocate_code |
| 586 | relocate_code: |
| 587 | mr r1, r3 /* Set new stack pointer */ |
| 588 | mr r9, r4 /* Save copy of Global Data pointer */ |
| 589 | mr r10, r5 /* Save copy of Destination Address */ |
| 590 | |
| 591 | mr r3, r5 /* Destination Address */ |
| 592 | lis r4, CFG_MONITOR_BASE@h /* Source Address */ |
| 593 | ori r4, r4, CFG_MONITOR_BASE@l |
wdenk | 3b57fe0 | 2003-05-30 12:48:29 +0000 | [diff] [blame] | 594 | lwz r5, GOT(__init_end) |
| 595 | sub r5, r5, r4 |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 596 | li r6, CFG_CACHELINE_SIZE /* Cache Line Size */ |
| 597 | |
| 598 | /* |
| 599 | * Fix GOT pointer: |
| 600 | * |
| 601 | * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address |
| 602 | * |
| 603 | * Offset: |
| 604 | */ |
| 605 | sub r15, r10, r4 |
| 606 | |
| 607 | /* First our own GOT */ |
| 608 | add r14, r14, r15 |
| 609 | /* then the one used by the C code */ |
| 610 | add r30, r30, r15 |
| 611 | |
| 612 | /* |
| 613 | * Now relocate code |
| 614 | */ |
| 615 | #ifdef CONFIG_ECC |
| 616 | bl board_relocate_rom |
| 617 | sync |
| 618 | mr r3, r10 /* Destination Address */ |
| 619 | lis r4, CFG_MONITOR_BASE@h /* Source Address */ |
| 620 | ori r4, r4, CFG_MONITOR_BASE@l |
wdenk | 3b57fe0 | 2003-05-30 12:48:29 +0000 | [diff] [blame] | 621 | lwz r5, GOT(__init_end) |
| 622 | sub r5, r5, r4 |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 623 | li r6, CFG_CACHELINE_SIZE /* Cache Line Size */ |
| 624 | #else |
| 625 | cmplw cr1,r3,r4 |
| 626 | addi r0,r5,3 |
| 627 | srwi. r0,r0,2 |
| 628 | beq cr1,4f /* In place copy is not necessary */ |
| 629 | beq 7f /* Protect against 0 count */ |
| 630 | mtctr r0 |
| 631 | bge cr1,2f |
| 632 | |
| 633 | la r8,-4(r4) |
| 634 | la r7,-4(r3) |
| 635 | 1: lwzu r0,4(r8) |
| 636 | stwu r0,4(r7) |
| 637 | bdnz 1b |
| 638 | b 4f |
| 639 | |
| 640 | 2: slwi r0,r0,2 |
| 641 | add r8,r4,r0 |
| 642 | add r7,r3,r0 |
| 643 | 3: lwzu r0,-4(r8) |
| 644 | stwu r0,-4(r7) |
| 645 | bdnz 3b |
| 646 | #endif |
| 647 | /* |
| 648 | * Now flush the cache: note that we must start from a cache aligned |
| 649 | * address. Otherwise we might miss one cache line. |
| 650 | */ |
| 651 | 4: cmpwi r6,0 |
| 652 | add r5,r3,r5 |
| 653 | beq 7f /* Always flush prefetch queue in any case */ |
| 654 | subi r0,r6,1 |
| 655 | andc r3,r3,r0 |
| 656 | mr r4,r3 |
| 657 | 5: dcbst 0,r4 |
| 658 | add r4,r4,r6 |
| 659 | cmplw r4,r5 |
| 660 | blt 5b |
| 661 | sync /* Wait for all dcbst to complete on bus */ |
| 662 | mr r4,r3 |
| 663 | 6: icbi 0,r4 |
| 664 | add r4,r4,r6 |
| 665 | cmplw r4,r5 |
| 666 | blt 6b |
| 667 | 7: sync /* Wait for all icbi to complete on bus */ |
| 668 | isync |
| 669 | |
| 670 | /* |
| 671 | * We are done. Do not return, instead branch to second part of board |
| 672 | * initialization, now running from RAM. |
| 673 | */ |
| 674 | addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET |
| 675 | mtlr r0 |
| 676 | blr |
| 677 | |
| 678 | in_ram: |
| 679 | #ifdef CONFIG_ECC |
| 680 | bl board_init_ecc |
| 681 | #endif |
| 682 | /* |
| 683 | * Relocation Function, r14 point to got2+0x8000 |
| 684 | * |
| 685 | * Adjust got2 pointers, no need to check for 0, this code |
| 686 | * already puts a few entries in the table. |
| 687 | */ |
| 688 | li r0,__got2_entries@sectoff@l |
| 689 | la r3,GOT(_GOT2_TABLE_) |
| 690 | lwz r11,GOT(_GOT2_TABLE_) |
| 691 | mtctr r0 |
| 692 | sub r11,r3,r11 |
| 693 | addi r3,r3,-4 |
| 694 | 1: lwzu r0,4(r3) |
| 695 | add r0,r0,r11 |
| 696 | stw r0,0(r3) |
| 697 | bdnz 1b |
| 698 | |
| 699 | /* |
| 700 | * Now adjust the fixups and the pointers to the fixups |
| 701 | * in case we need to move ourselves again. |
| 702 | */ |
| 703 | 2: li r0,__fixup_entries@sectoff@l |
| 704 | lwz r3,GOT(_FIXUP_TABLE_) |
| 705 | cmpwi r0,0 |
| 706 | mtctr r0 |
| 707 | addi r3,r3,-4 |
| 708 | beq 4f |
| 709 | 3: lwzu r4,4(r3) |
| 710 | lwzux r0,r4,r11 |
| 711 | add r0,r0,r11 |
| 712 | stw r10,0(r3) |
| 713 | stw r0,0(r4) |
| 714 | bdnz 3b |
| 715 | 4: |
| 716 | /* clear_bss: */ |
| 717 | /* |
| 718 | * Now clear BSS segment |
| 719 | */ |
wdenk | 5d232d0 | 2003-05-22 22:52:13 +0000 | [diff] [blame] | 720 | lwz r3,GOT(__bss_start) |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 721 | lwz r4,GOT(_end) |
| 722 | |
| 723 | cmplw 0, r3, r4 |
| 724 | beq 6f |
| 725 | |
| 726 | li r0, 0 |
| 727 | 5: |
| 728 | stw r0, 0(r3) |
| 729 | addi r3, r3, 4 |
| 730 | cmplw 0, r3, r4 |
| 731 | bne 5b |
| 732 | 6: |
| 733 | mr r3, r10 /* Destination Address */ |
wdenk | 7c7a23b | 2002-12-07 00:20:59 +0000 | [diff] [blame] | 734 | #ifdef CONFIG_AMIGAONEG3SE |
| 735 | mr r4, r9 /* Use RAM copy of the global data */ |
| 736 | #endif |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 737 | bl after_reloc |
| 738 | |
| 739 | /* not reached - end relocate_code */ |
| 740 | /*-----------------------------------------------------------------------*/ |
| 741 | |
wdenk | 47d1a6e | 2002-11-03 00:01:44 +0000 | [diff] [blame] | 742 | /* |
| 743 | * Copy exception vector code to low memory |
| 744 | * |
| 745 | * r3: dest_addr |
| 746 | * r7: source address, r8: end address, r9: target address |
| 747 | */ |
| 748 | .globl trap_init |
| 749 | trap_init: |
| 750 | lwz r7, GOT(_start) |
| 751 | lwz r8, GOT(_end_of_vectors) |
| 752 | |
| 753 | rlwinm r9, r7, 0, 18, 31 /* _start & 0x3FFF */ |
| 754 | |
| 755 | cmplw 0, r7, r8 |
| 756 | bgelr /* return if r7>=r8 - just in case */ |
| 757 | |
| 758 | mflr r4 /* save link register */ |
| 759 | 1: |
| 760 | lwz r0, 0(r7) |
| 761 | stw r0, 0(r9) |
| 762 | addi r7, r7, 4 |
| 763 | addi r9, r9, 4 |
| 764 | cmplw 0, r7, r8 |
| 765 | bne 1b |
| 766 | |
| 767 | /* |
| 768 | * relocate `hdlr' and `int_return' entries |
| 769 | */ |
| 770 | li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET |
| 771 | li r8, Alignment - _start + EXC_OFF_SYS_RESET |
| 772 | 2: |
| 773 | bl trap_reloc |
| 774 | addi r7, r7, 0x100 /* next exception vector */ |
| 775 | cmplw 0, r7, r8 |
| 776 | blt 2b |
| 777 | |
| 778 | li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET |
| 779 | bl trap_reloc |
| 780 | |
| 781 | li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET |
| 782 | bl trap_reloc |
| 783 | |
| 784 | li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET |
| 785 | li r8, SystemCall - _start + EXC_OFF_SYS_RESET |
| 786 | 3: |
| 787 | bl trap_reloc |
| 788 | addi r7, r7, 0x100 /* next exception vector */ |
| 789 | cmplw 0, r7, r8 |
| 790 | blt 3b |
| 791 | |
| 792 | li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET |
| 793 | li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET |
| 794 | 4: |
| 795 | bl trap_reloc |
| 796 | addi r7, r7, 0x100 /* next exception vector */ |
| 797 | cmplw 0, r7, r8 |
| 798 | blt 4b |
| 799 | |
| 800 | /* enable execptions from RAM vectors */ |
| 801 | mfmsr r7 |
| 802 | li r8,MSR_IP |
| 803 | andc r7,r7,r8 |
| 804 | mtmsr r7 |
| 805 | |
| 806 | mtlr r4 /* restore link register */ |
| 807 | blr |
| 808 | |
| 809 | /* |
| 810 | * Function: relocate entries for one exception vector |
| 811 | */ |
| 812 | trap_reloc: |
| 813 | lwz r0, 0(r7) /* hdlr ... */ |
| 814 | add r0, r0, r3 /* ... += dest_addr */ |
| 815 | stw r0, 0(r7) |
| 816 | |
| 817 | lwz r0, 4(r7) /* int_return ... */ |
| 818 | add r0, r0, r3 /* ... += dest_addr */ |
| 819 | stw r0, 4(r7) |
| 820 | |
| 821 | sync |
| 822 | isync |
| 823 | |
| 824 | blr |
| 825 | |
| 826 | #ifdef CFG_INIT_RAM_LOCK |
| 827 | lock_ram_in_cache: |
| 828 | /* Allocate Initial RAM in data cache. |
| 829 | */ |
| 830 | lis r3, (CFG_INIT_RAM_ADDR & ~31)@h |
| 831 | ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l |
| 832 | li r2, ((CFG_INIT_RAM_END & ~31) + \ |
| 833 | (CFG_INIT_RAM_ADDR & 31) + 31) / 32 |
| 834 | mtctr r2 |
| 835 | 1: |
| 836 | dcbz r0, r3 |
| 837 | addi r3, r3, 32 |
| 838 | bdnz 1b |
| 839 | |
| 840 | /* Lock the data cache */ |
| 841 | mfspr r0, HID0 |
| 842 | ori r0, r0, 0x1000 |
| 843 | sync |
| 844 | mtspr HID0, r0 |
| 845 | sync |
| 846 | blr |
| 847 | |
| 848 | .globl unlock_ram_in_cache |
| 849 | unlock_ram_in_cache: |
| 850 | /* invalidate the INIT_RAM section */ |
| 851 | lis r3, (CFG_INIT_RAM_ADDR & ~31)@h |
| 852 | ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l |
| 853 | li r2, ((CFG_INIT_RAM_END & ~31) + \ |
| 854 | (CFG_INIT_RAM_ADDR & 31) + 31) / 32 |
| 855 | mtctr r2 |
| 856 | 1: icbi r0, r3 |
| 857 | addi r3, r3, 32 |
| 858 | bdnz 1b |
| 859 | sync /* Wait for all icbi to complete on bus */ |
| 860 | isync |
| 861 | |
| 862 | /* Unlock the data cache and invalidate it */ |
| 863 | mfspr r0, HID0 |
| 864 | li r3,0x1000 |
| 865 | andc r0,r0,r3 |
| 866 | li r3,0x0400 |
| 867 | or r0,r0,r3 |
| 868 | sync |
| 869 | mtspr HID0, r0 |
| 870 | sync |
| 871 | blr |
| 872 | #endif |