projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9994a338 PM |
1 | /* |
| 2 | * This file contains miscellaneous low-level functions. | |
| 3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
| 4 | * | |
| 5 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) | |
| 6 | * and Paul Mackerras. | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU General Public License | |
| 10 | * as published by the Free Software Foundation; either version | |
| 11 | * 2 of the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/config.h> | |
| 16 | #include <linux/sys.h> | |
| 17 | #include <asm/unistd.h> | |
| 18 | #include <asm/errno.h> | |
| 19 | #include <asm/reg.h> | |
| 20 | #include <asm/page.h> | |
| 21 | #include <asm/cache.h> | |
| 22 | #include <asm/cputable.h> | |
| 23 | #include <asm/mmu.h> | |
| 24 | #include <asm/ppc_asm.h> | |
| 25 | #include <asm/thread_info.h> | |
| 26 | #include <asm/asm-offsets.h> | |
| 27 | ||
| 28 | .text | |
| 29 | ||
| 30 | .align 5 | |
| 31 | _GLOBAL(__delay) | |
| 32 | cmpwi 0,r3,0 | |
| 33 | mtctr r3 | |
| 34 | beqlr | |
| 35 | 1: bdnz 1b | |
| 36 | blr | |
| 37 | ||
| 38 | /* | |
| 39 | * Returns (address we're running at) - (address we were linked at) | |
| 40 | * for use before the text and data are mapped to KERNELBASE. | |
| 41 | */ | |
| 42 | _GLOBAL(reloc_offset) | |
| 43 | mflr r0 | |
| 44 | bl 1f | |
| 45 | 1: mflr r3 | |
| 46 | lis r4,1b@ha | |
| 47 | addi r4,r4,1b@l | |
| 48 | subf r3,r4,r3 | |
| 49 | mtlr r0 | |
| 50 | blr | |
| 51 | ||
| 52 | /* | |
| 53 | * add_reloc_offset(x) returns x + reloc_offset(). | |
| 54 | */ | |
| 55 | _GLOBAL(add_reloc_offset) | |
| 56 | mflr r0 | |
| 57 | bl 1f | |
| 58 | 1: mflr r5 | |
| 59 | lis r4,1b@ha | |
| 60 | addi r4,r4,1b@l | |
| 61 | subf r5,r4,r5 | |
| 62 | add r3,r3,r5 | |
| 63 | mtlr r0 | |
| 64 | blr | |
| 65 | ||
| 66 | /* | |
| 67 | * sub_reloc_offset(x) returns x - reloc_offset(). | |
| 68 | */ | |
| 69 | _GLOBAL(sub_reloc_offset) | |
| 70 | mflr r0 | |
| 71 | bl 1f | |
| 72 | 1: mflr r5 | |
| 73 | lis r4,1b@ha | |
| 74 | addi r4,r4,1b@l | |
| 75 | subf r5,r4,r5 | |
| 76 | subf r3,r5,r3 | |
| 77 | mtlr r0 | |
| 78 | blr | |
| 79 | ||
| 80 | /* | |
| 81 | * reloc_got2 runs through the .got2 section adding an offset | |
| 82 | * to each entry. | |
| 83 | */ | |
| 84 | _GLOBAL(reloc_got2) | |
| 85 | mflr r11 | |
| 86 | lis r7,__got2_start@ha | |
| 87 | addi r7,r7,__got2_start@l | |
| 88 | lis r8,__got2_end@ha | |
| 89 | addi r8,r8,__got2_end@l | |
| 90 | subf r8,r7,r8 | |
| 91 | srwi. r8,r8,2 | |
| 92 | beqlr | |
| 93 | mtctr r8 | |
| 94 | bl 1f | |
| 95 | 1: mflr r0 | |
| 96 | lis r4,1b@ha | |
| 97 | addi r4,r4,1b@l | |
| 98 | subf r0,r4,r0 | |
| 99 | add r7,r0,r7 | |
| 100 | 2: lwz r0,0(r7) | |
| 101 | add r0,r0,r3 | |
| 102 | stw r0,0(r7) | |
| 103 | addi r7,r7,4 | |
| 104 | bdnz 2b | |
| 105 | mtlr r11 | |
| 106 | blr | |
| 107 | ||
| 108 | /* | |
| 109 | * identify_cpu, | |
| 110 | * called with r3 = data offset and r4 = CPU number | |
| 111 | * doesn't change r3 | |
| 112 | */ | |
| 113 | _GLOBAL(identify_cpu) | |
| 114 | addis r8,r3,cpu_specs@ha | |
| 115 | addi r8,r8,cpu_specs@l | |
| 116 | mfpvr r7 | |
| 117 | 1: | |
| 118 | lwz r5,CPU_SPEC_PVR_MASK(r8) | |
| 119 | and r5,r5,r7 | |
| 120 | lwz r6,CPU_SPEC_PVR_VALUE(r8) | |
| 121 | cmplw 0,r6,r5 | |
| 122 | beq 1f | |
| 123 | addi r8,r8,CPU_SPEC_ENTRY_SIZE | |
| 124 | b 1b | |
| 125 | 1: | |
| 126 | addis r6,r3,cur_cpu_spec@ha | |
| 127 | addi r6,r6,cur_cpu_spec@l | |
| 128 | sub r8,r8,r3 | |
| 129 | stw r8,0(r6) | |
| 130 | blr | |
| 131 | ||
| 132 | /* | |
| 133 | * do_cpu_ftr_fixups - goes through the list of CPU feature fixups | |
| 134 | * and writes nop's over sections of code that don't apply for this cpu. | |
| 135 | * r3 = data offset (not changed) | |
| 136 | */ | |
| 137 | _GLOBAL(do_cpu_ftr_fixups) | |
| 138 | /* Get CPU 0 features */ | |
| 139 | addis r6,r3,cur_cpu_spec@ha | |
| 140 | addi r6,r6,cur_cpu_spec@l | |
| 141 | lwz r4,0(r6) | |
| 142 | add r4,r4,r3 | |
| 143 | lwz r4,CPU_SPEC_FEATURES(r4) | |
| 144 | ||
| 145 | /* Get the fixup table */ | |
| 146 | addis r6,r3,__start___ftr_fixup@ha | |
| 147 | addi r6,r6,__start___ftr_fixup@l | |
| 148 | addis r7,r3,__stop___ftr_fixup@ha | |
| 149 | addi r7,r7,__stop___ftr_fixup@l | |
| 150 | ||
| 151 | /* Do the fixup */ | |
| 152 | 1: cmplw 0,r6,r7 | |
| 153 | bgelr | |
| 154 | addi r6,r6,16 | |
| 155 | lwz r8,-16(r6) /* mask */ | |
| 156 | and r8,r8,r4 | |
| 157 | lwz r9,-12(r6) /* value */ | |
| 158 | cmplw 0,r8,r9 | |
| 159 | beq 1b | |
| 160 | lwz r8,-8(r6) /* section begin */ | |
| 161 | lwz r9,-4(r6) /* section end */ | |
| 162 | subf. r9,r8,r9 | |
| 163 | beq 1b | |
| 164 | /* write nops over the section of code */ | |
| 165 | /* todo: if large section, add a branch at the start of it */ | |
| 166 | srwi r9,r9,2 | |
| 167 | mtctr r9 | |
| 168 | add r8,r8,r3 | |
| 169 | lis r0,0x60000000@h /* nop */ | |
| 170 | 3: stw r0,0(r8) | |
| 171 | andi. r10,r4,CPU_FTR_SPLIT_ID_CACHE@l | |
| 172 | beq 2f | |
| 173 | dcbst 0,r8 /* suboptimal, but simpler */ | |
| 174 | sync | |
| 175 | icbi 0,r8 | |
| 176 | 2: addi r8,r8,4 | |
| 177 | bdnz 3b | |
| 178 | sync /* additional sync needed on g4 */ | |
| 179 | isync | |
| 180 | b 1b | |
| 181 | ||
| 182 | /* | |
| 183 | * call_setup_cpu - call the setup_cpu function for this cpu | |
| 184 | * r3 = data offset, r24 = cpu number | |
| 185 | * | |
| 186 | * Setup function is called with: | |
| 187 | * r3 = data offset | |
| 188 | * r4 = ptr to CPU spec (relocated) | |
| 189 | */ | |
| 190 | _GLOBAL(call_setup_cpu) | |
| 191 | addis r4,r3,cur_cpu_spec@ha | |
| 192 | addi r4,r4,cur_cpu_spec@l | |
| 193 | lwz r4,0(r4) | |
| 194 | add r4,r4,r3 | |
| 195 | lwz r5,CPU_SPEC_SETUP(r4) | |
| 196 | cmpi 0,r5,0 | |
| 197 | add r5,r5,r3 | |
| 198 | beqlr | |
| 199 | mtctr r5 | |
| 200 | bctr | |
| 201 | ||
| 202 | #if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx) | |
| 203 | ||
| 204 | /* This gets called by via-pmu.c to switch the PLL selection | |
| 205 | * on 750fx CPU. This function should really be moved to some | |
| 206 | * other place (as most of the cpufreq code in via-pmu | |
| 207 | */ | |
| 208 | _GLOBAL(low_choose_750fx_pll) | |
| 209 | /* Clear MSR:EE */ | |
| 210 | mfmsr r7 | |
| 211 | rlwinm r0,r7,0,17,15 | |
| 212 | mtmsr r0 | |
| 213 | ||
| 214 | /* If switching to PLL1, disable HID0:BTIC */ | |
| 215 | cmplwi cr0,r3,0 | |
| 216 | beq 1f | |
| 217 | mfspr r5,SPRN_HID0 | |
| 218 | rlwinm r5,r5,0,27,25 | |
| 219 | sync | |
| 220 | mtspr SPRN_HID0,r5 | |
| 221 | isync | |
| 222 | sync | |
| 223 | ||
| 224 | 1: | |
| 225 | /* Calc new HID1 value */ | |
| 226 | mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */ | |
| 227 | rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */ | |
| 228 | rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */ | |
| 229 | or r4,r4,r5 | |
| 230 | mtspr SPRN_HID1,r4 | |
| 231 | ||
| 232 | /* Store new HID1 image */ | |
| 233 | rlwinm r6,r1,0,0,18 | |
| 234 | lwz r6,TI_CPU(r6) | |
| 235 | slwi r6,r6,2 | |
| 236 | addis r6,r6,nap_save_hid1@ha | |
| 237 | stw r4,nap_save_hid1@l(r6) | |
| 238 | ||
| 239 | /* If switching to PLL0, enable HID0:BTIC */ | |
| 240 | cmplwi cr0,r3,0 | |
| 241 | bne 1f | |
| 242 | mfspr r5,SPRN_HID0 | |
| 243 | ori r5,r5,HID0_BTIC | |
| 244 | sync | |
| 245 | mtspr SPRN_HID0,r5 | |
| 246 | isync | |
| 247 | sync | |
| 248 | ||
| 249 | 1: | |
| 250 | /* Return */ | |
| 251 | mtmsr r7 | |
| 252 | blr | |
| 253 | ||
| 254 | _GLOBAL(low_choose_7447a_dfs) | |
| 255 | /* Clear MSR:EE */ | |
| 256 | mfmsr r7 | |
| 257 | rlwinm r0,r7,0,17,15 | |
| 258 | mtmsr r0 | |
| 259 | ||
| 260 | /* Calc new HID1 value */ | |
| 261 | mfspr r4,SPRN_HID1 | |
| 262 | insrwi r4,r3,1,9 /* insert parameter into bit 9 */ | |
| 263 | sync | |
| 264 | mtspr SPRN_HID1,r4 | |
| 265 | sync | |
| 266 | isync | |
| 267 | ||
| 268 | /* Return */ | |
| 269 | mtmsr r7 | |
| 270 | blr | |
| 271 | ||
| 272 | #endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */ | |
| 273 | ||
| 274 | /* | |
| 275 | * complement mask on the msr then "or" some values on. | |
| 276 | * _nmask_and_or_msr(nmask, value_to_or) | |
| 277 | */ | |
| 278 | _GLOBAL(_nmask_and_or_msr) | |
| 279 | mfmsr r0 /* Get current msr */ | |
| 280 | andc r0,r0,r3 /* And off the bits set in r3 (first parm) */ | |
| 281 | or r0,r0,r4 /* Or on the bits in r4 (second parm) */ | |
| 282 | SYNC /* Some chip revs have problems here... */ | |
| 283 | mtmsr r0 /* Update machine state */ | |
| 284 | isync | |
| 285 | blr /* Done */ | |
| 286 | ||
| 287 | ||
| 288 | /* | |
| 289 | * Flush MMU TLB | |
| 290 | */ | |
| 291 | _GLOBAL(_tlbia) | |
| 292 | #if defined(CONFIG_40x) | |
| 293 | sync /* Flush to memory before changing mapping */ | |
| 294 | tlbia | |
| 295 | isync /* Flush shadow TLB */ | |
| 296 | #elif defined(CONFIG_44x) | |
| 297 | li r3,0 | |
| 298 | sync | |
| 299 | ||
| 300 | /* Load high watermark */ | |
| 301 | lis r4,tlb_44x_hwater@ha | |
| 302 | lwz r5,tlb_44x_hwater@l(r4) | |
| 303 | ||
| 304 | 1: tlbwe r3,r3,PPC44x_TLB_PAGEID | |
| 305 | addi r3,r3,1 | |
| 306 | cmpw 0,r3,r5 | |
| 307 | ble 1b | |
| 308 | ||
| 309 | isync | |
| 310 | #elif defined(CONFIG_FSL_BOOKE) | |
| 311 | /* Invalidate all entries in TLB0 */ | |
| 312 | li r3, 0x04 | |
| 313 | tlbivax 0,3 | |
| 314 | /* Invalidate all entries in TLB1 */ | |
| 315 | li r3, 0x0c | |
| 316 | tlbivax 0,3 | |
| 317 | /* Invalidate all entries in TLB2 */ | |
| 318 | li r3, 0x14 | |
| 319 | tlbivax 0,3 | |
| 320 | /* Invalidate all entries in TLB3 */ | |
| 321 | li r3, 0x1c | |
| 322 | tlbivax 0,3 | |
| 323 | msync | |
| 324 | #ifdef CONFIG_SMP | |
| 325 | tlbsync | |
| 326 | #endif /* CONFIG_SMP */ | |
| 327 | #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ | |
| 328 | #if defined(CONFIG_SMP) | |
| 329 | rlwinm r8,r1,0,0,18 | |
| 330 | lwz r8,TI_CPU(r8) | |
| 331 | oris r8,r8,10 | |
| 332 | mfmsr r10 | |
| 333 | SYNC | |
| 334 | rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ | |
| 335 | rlwinm r0,r0,0,28,26 /* clear DR */ | |
| 336 | mtmsr r0 | |
| 337 | SYNC_601 | |
| 338 | isync | |
| 339 | lis r9,mmu_hash_lock@h | |
| 340 | ori r9,r9,mmu_hash_lock@l | |
| 341 | tophys(r9,r9) | |
| 342 | 10: lwarx r7,0,r9 | |
| 343 | cmpwi 0,r7,0 | |
| 344 | bne- 10b | |
| 345 | stwcx. r8,0,r9 | |
| 346 | bne- 10b | |
| 347 | sync | |
| 348 | tlbia | |
| 349 | sync | |
| 350 | TLBSYNC | |
| 351 | li r0,0 | |
| 352 | stw r0,0(r9) /* clear mmu_hash_lock */ | |
| 353 | mtmsr r10 | |
| 354 | SYNC_601 | |
| 355 | isync | |
| 356 | #else /* CONFIG_SMP */ | |
| 357 | sync | |
| 358 | tlbia | |
| 359 | sync | |
| 360 | #endif /* CONFIG_SMP */ | |
| 361 | #endif /* ! defined(CONFIG_40x) */ | |
| 362 | blr | |
| 363 | ||
| 364 | /* | |
| 365 | * Flush MMU TLB for a particular address | |
| 366 | */ | |
| 367 | _GLOBAL(_tlbie) | |
| 368 | #if defined(CONFIG_40x) | |
| 369 | tlbsx. r3, 0, r3 | |
| 370 | bne 10f | |
| 371 | sync | |
| 372 | /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is clear. | |
| 373 | * Since 25 is the V bit in the TLB_TAG, loading this value will invalidate | |
| 374 | * the TLB entry. */ | |
| 375 | tlbwe r3, r3, TLB_TAG | |
| 376 | isync | |
| 377 | 10: | |
| 378 | #elif defined(CONFIG_44x) | |
| 379 | mfspr r4,SPRN_MMUCR | |
| 380 | mfspr r5,SPRN_PID /* Get PID */ | |
| 381 | rlwimi r4,r5,0,24,31 /* Set TID */ | |
| 382 | mtspr SPRN_MMUCR,r4 | |
| 383 | ||
| 384 | tlbsx. r3, 0, r3 | |
| 385 | bne 10f | |
| 386 | sync | |
| 387 | /* There are only 64 TLB entries, so r3 < 64, | |
| 388 | * which means bit 22, is clear. Since 22 is | |
| 389 | * the V bit in the TLB_PAGEID, loading this | |
| 390 | * value will invalidate the TLB entry. | |
| 391 | */ | |
| 392 | tlbwe r3, r3, PPC44x_TLB_PAGEID | |
| 393 | isync | |
| 394 | 10: | |
| 395 | #elif defined(CONFIG_FSL_BOOKE) | |
| 396 | rlwinm r4, r3, 0, 0, 19 | |
| 397 | ori r5, r4, 0x08 /* TLBSEL = 1 */ | |
| 398 | ori r6, r4, 0x10 /* TLBSEL = 2 */ | |
| 399 | ori r7, r4, 0x18 /* TLBSEL = 3 */ | |
| 400 | tlbivax 0, r4 | |
| 401 | tlbivax 0, r5 | |
| 402 | tlbivax 0, r6 | |
| 403 | tlbivax 0, r7 | |
| 404 | msync | |
| 405 | #if defined(CONFIG_SMP) | |
| 406 | tlbsync | |
| 407 | #endif /* CONFIG_SMP */ | |
| 408 | #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ | |
| 409 | #if defined(CONFIG_SMP) | |
| 410 | rlwinm r8,r1,0,0,18 | |
| 411 | lwz r8,TI_CPU(r8) | |
| 412 | oris r8,r8,11 | |
| 413 | mfmsr r10 | |
| 414 | SYNC | |
| 415 | rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ | |
| 416 | rlwinm r0,r0,0,28,26 /* clear DR */ | |
| 417 | mtmsr r0 | |
| 418 | SYNC_601 | |
| 419 | isync | |
| 420 | lis r9,mmu_hash_lock@h | |
| 421 | ori r9,r9,mmu_hash_lock@l | |
| 422 | tophys(r9,r9) | |
| 423 | 10: lwarx r7,0,r9 | |
| 424 | cmpwi 0,r7,0 | |
| 425 | bne- 10b | |
| 426 | stwcx. r8,0,r9 | |
| 427 | bne- 10b | |
| 428 | eieio | |
| 429 | tlbie r3 | |
| 430 | sync | |
| 431 | TLBSYNC | |
| 432 | li r0,0 | |
| 433 | stw r0,0(r9) /* clear mmu_hash_lock */ | |
| 434 | mtmsr r10 | |
| 435 | SYNC_601 | |
| 436 | isync | |
| 437 | #else /* CONFIG_SMP */ | |
| 438 | tlbie r3 | |
| 439 | sync | |
| 440 | #endif /* CONFIG_SMP */ | |
| 441 | #endif /* ! CONFIG_40x */ | |
| 442 | blr | |
| 443 | ||
| 444 | /* | |
| 445 | * Flush instruction cache. | |
| 446 | * This is a no-op on the 601. | |
| 447 | */ | |
| 448 | _GLOBAL(flush_instruction_cache) | |
| 449 | #if defined(CONFIG_8xx) | |
| 450 | isync | |
| 451 | lis r5, IDC_INVALL@h | |
| 452 | mtspr SPRN_IC_CST, r5 | |
| 453 | #elif defined(CONFIG_4xx) | |
| 454 | #ifdef CONFIG_403GCX | |
| 455 | li r3, 512 | |
| 456 | mtctr r3 | |
| 457 | lis r4, KERNELBASE@h | |
| 458 | 1: iccci 0, r4 | |
| 459 | addi r4, r4, 16 | |
| 460 | bdnz 1b | |
| 461 | #else | |
| 462 | lis r3, KERNELBASE@h | |
| 463 | iccci 0,r3 | |
| 464 | #endif | |
| 465 | #elif CONFIG_FSL_BOOKE | |
| 466 | BEGIN_FTR_SECTION | |
| 467 | mfspr r3,SPRN_L1CSR0 | |
| 468 | ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC | |
| 469 | /* msync; isync recommended here */ | |
| 470 | mtspr SPRN_L1CSR0,r3 | |
| 471 | isync | |
| 472 | blr | |
| 473 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
| 474 | mfspr r3,SPRN_L1CSR1 | |
| 475 | ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR | |
| 476 | mtspr SPRN_L1CSR1,r3 | |
| 477 | #else | |
| 478 | mfspr r3,SPRN_PVR | |
| 479 | rlwinm r3,r3,16,16,31 | |
| 480 | cmpwi 0,r3,1 | |
| 481 | beqlr /* for 601, do nothing */ | |
| 482 | /* 603/604 processor - use invalidate-all bit in HID0 */ | |
| 483 | mfspr r3,SPRN_HID0 | |
| 484 | ori r3,r3,HID0_ICFI | |
| 485 | mtspr SPRN_HID0,r3 | |
| 486 | #endif /* CONFIG_8xx/4xx */ | |
| 487 | isync | |
| 488 | blr | |
| 489 | ||
| 490 | /* | |
| 491 | * Write any modified data cache blocks out to memory | |
| 492 | * and invalidate the corresponding instruction cache blocks. | |
| 493 | * This is a no-op on the 601. | |
| 494 | * | |
| 495 | * flush_icache_range(unsigned long start, unsigned long stop) | |
| 496 | */ | |
| 497 | _GLOBAL(flush_icache_range) | |
| 498 | BEGIN_FTR_SECTION | |
| 499 | blr /* for 601, do nothing */ | |
| 500 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
| 501 | li r5,L1_CACHE_LINE_SIZE-1 | |
| 502 | andc r3,r3,r5 | |
| 503 | subf r4,r3,r4 | |
| 504 | add r4,r4,r5 | |
| 505 | srwi. r4,r4,LG_L1_CACHE_LINE_SIZE | |
| 506 | beqlr | |
| 507 | mtctr r4 | |
| 508 | mr r6,r3 | |
| 509 | 1: dcbst 0,r3 | |
| 510 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 511 | bdnz 1b | |
| 512 | sync /* wait for dcbst's to get to ram */ | |
| 513 | mtctr r4 | |
| 514 | 2: icbi 0,r6 | |
| 515 | addi r6,r6,L1_CACHE_LINE_SIZE | |
| 516 | bdnz 2b | |
| 517 | sync /* additional sync needed on g4 */ | |
| 518 | isync | |
| 519 | blr | |
| 520 | /* | |
| 521 | * Write any modified data cache blocks out to memory. | |
| 522 | * Does not invalidate the corresponding cache lines (especially for | |
| 523 | * any corresponding instruction cache). | |
| 524 | * | |
| 525 | * clean_dcache_range(unsigned long start, unsigned long stop) | |
| 526 | */ | |
| 527 | _GLOBAL(clean_dcache_range) | |
| 528 | li r5,L1_CACHE_LINE_SIZE-1 | |
| 529 | andc r3,r3,r5 | |
| 530 | subf r4,r3,r4 | |
| 531 | add r4,r4,r5 | |
| 532 | srwi. r4,r4,LG_L1_CACHE_LINE_SIZE | |
| 533 | beqlr | |
| 534 | mtctr r4 | |
| 535 | ||
| 536 | 1: dcbst 0,r3 | |
| 537 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 538 | bdnz 1b | |
| 539 | sync /* wait for dcbst's to get to ram */ | |
| 540 | blr | |
| 541 | ||
| 542 | /* | |
| 543 | * Write any modified data cache blocks out to memory and invalidate them. | |
| 544 | * Does not invalidate the corresponding instruction cache blocks. | |
| 545 | * | |
| 546 | * flush_dcache_range(unsigned long start, unsigned long stop) | |
| 547 | */ | |
| 548 | _GLOBAL(flush_dcache_range) | |
| 549 | li r5,L1_CACHE_LINE_SIZE-1 | |
| 550 | andc r3,r3,r5 | |
| 551 | subf r4,r3,r4 | |
| 552 | add r4,r4,r5 | |
| 553 | srwi. r4,r4,LG_L1_CACHE_LINE_SIZE | |
| 554 | beqlr | |
| 555 | mtctr r4 | |
| 556 | ||
| 557 | 1: dcbf 0,r3 | |
| 558 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 559 | bdnz 1b | |
| 560 | sync /* wait for dcbst's to get to ram */ | |
| 561 | blr | |
| 562 | ||
| 563 | /* | |
| 564 | * Like above, but invalidate the D-cache. This is used by the 8xx | |
| 565 | * to invalidate the cache so the PPC core doesn't get stale data | |
| 566 | * from the CPM (no cache snooping here :-). | |
| 567 | * | |
| 568 | * invalidate_dcache_range(unsigned long start, unsigned long stop) | |
| 569 | */ | |
| 570 | _GLOBAL(invalidate_dcache_range) | |
| 571 | li r5,L1_CACHE_LINE_SIZE-1 | |
| 572 | andc r3,r3,r5 | |
| 573 | subf r4,r3,r4 | |
| 574 | add r4,r4,r5 | |
| 575 | srwi. r4,r4,LG_L1_CACHE_LINE_SIZE | |
| 576 | beqlr | |
| 577 | mtctr r4 | |
| 578 | ||
| 579 | 1: dcbi 0,r3 | |
| 580 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 581 | bdnz 1b | |
| 582 | sync /* wait for dcbi's to get to ram */ | |
| 583 | blr | |
| 584 | ||
| 585 | #ifdef CONFIG_NOT_COHERENT_CACHE | |
| 586 | /* | |
| 587 | * 40x cores have 8K or 16K dcache and 32 byte line size. | |
| 588 | * 44x has a 32K dcache and 32 byte line size. | |
| 589 | * 8xx has 1, 2, 4, 8K variants. | |
| 590 | * For now, cover the worst case of the 44x. | |
| 591 | * Must be called with external interrupts disabled. | |
| 592 | */ | |
| 593 | #define CACHE_NWAYS 64 | |
| 594 | #define CACHE_NLINES 16 | |
| 595 | ||
| 596 | _GLOBAL(flush_dcache_all) | |
| 597 | li r4, (2 * CACHE_NWAYS * CACHE_NLINES) | |
| 598 | mtctr r4 | |
| 599 | lis r5, KERNELBASE@h | |
| 600 | 1: lwz r3, 0(r5) /* Load one word from every line */ | |
| 601 | addi r5, r5, L1_CACHE_LINE_SIZE | |
| 602 | bdnz 1b | |
| 603 | blr | |
| 604 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
| 605 | ||
| 606 | /* | |
| 607 | * Flush a particular page from the data cache to RAM. | |
| 608 | * Note: this is necessary because the instruction cache does *not* | |
| 609 | * snoop from the data cache. | |
| 610 | * This is a no-op on the 601 which has a unified cache. | |
| 611 | * | |
| 612 | * void __flush_dcache_icache(void *page) | |
| 613 | */ | |
| 614 | _GLOBAL(__flush_dcache_icache) | |
| 615 | BEGIN_FTR_SECTION | |
| 616 | blr /* for 601, do nothing */ | |
| 617 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
| 618 | rlwinm r3,r3,0,0,19 /* Get page base address */ | |
| 619 | li r4,4096/L1_CACHE_LINE_SIZE /* Number of lines in a page */ | |
| 620 | mtctr r4 | |
| 621 | mr r6,r3 | |
| 622 | 0: dcbst 0,r3 /* Write line to ram */ | |
| 623 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 624 | bdnz 0b | |
| 625 | sync | |
| 626 | mtctr r4 | |
| 627 | 1: icbi 0,r6 | |
| 628 | addi r6,r6,L1_CACHE_LINE_SIZE | |
| 629 | bdnz 1b | |
| 630 | sync | |
| 631 | isync | |
| 632 | blr | |
| 633 | ||
| 634 | /* | |
| 635 | * Flush a particular page from the data cache to RAM, identified | |
| 636 | * by its physical address. We turn off the MMU so we can just use | |
| 637 | * the physical address (this may be a highmem page without a kernel | |
| 638 | * mapping). | |
| 639 | * | |
| 640 | * void __flush_dcache_icache_phys(unsigned long physaddr) | |
| 641 | */ | |
| 642 | _GLOBAL(__flush_dcache_icache_phys) | |
| 643 | BEGIN_FTR_SECTION | |
| 644 | blr /* for 601, do nothing */ | |
| 645 | END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE) | |
| 646 | mfmsr r10 | |
| 647 | rlwinm r0,r10,0,28,26 /* clear DR */ | |
| 648 | mtmsr r0 | |
| 649 | isync | |
| 650 | rlwinm r3,r3,0,0,19 /* Get page base address */ | |
| 651 | li r4,4096/L1_CACHE_LINE_SIZE /* Number of lines in a page */ | |
| 652 | mtctr r4 | |
| 653 | mr r6,r3 | |
| 654 | 0: dcbst 0,r3 /* Write line to ram */ | |
| 655 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 656 | bdnz 0b | |
| 657 | sync | |
| 658 | mtctr r4 | |
| 659 | 1: icbi 0,r6 | |
| 660 | addi r6,r6,L1_CACHE_LINE_SIZE | |
| 661 | bdnz 1b | |
| 662 | sync | |
| 663 | mtmsr r10 /* restore DR */ | |
| 664 | isync | |
| 665 | blr | |
| 666 | ||
| 667 | /* | |
| 668 | * Clear pages using the dcbz instruction, which doesn't cause any | |
| 669 | * memory traffic (except to write out any cache lines which get | |
| 670 | * displaced). This only works on cacheable memory. | |
| 671 | * | |
| 672 | * void clear_pages(void *page, int order) ; | |
| 673 | */ | |
| 674 | _GLOBAL(clear_pages) | |
| 675 | li r0,4096/L1_CACHE_LINE_SIZE | |
| 676 | slw r0,r0,r4 | |
| 677 | mtctr r0 | |
| 678 | #ifdef CONFIG_8xx | |
| 679 | li r4, 0 | |
| 680 | 1: stw r4, 0(r3) | |
| 681 | stw r4, 4(r3) | |
| 682 | stw r4, 8(r3) | |
| 683 | stw r4, 12(r3) | |
| 684 | #else | |
| 685 | 1: dcbz 0,r3 | |
| 686 | #endif | |
| 687 | addi r3,r3,L1_CACHE_LINE_SIZE | |
| 688 | bdnz 1b | |
| 689 | blr | |
| 690 | ||
| 691 | /* | |
| 692 | * Copy a whole page. We use the dcbz instruction on the destination | |
| 693 | * to reduce memory traffic (it eliminates the unnecessary reads of | |
| 694 | * the destination into cache). This requires that the destination | |
| 695 | * is cacheable. | |
| 696 | */ | |
| 697 | #define COPY_16_BYTES \ | |
| 698 | lwz r6,4(r4); \ | |
| 699 | lwz r7,8(r4); \ | |
| 700 | lwz r8,12(r4); \ | |
| 701 | lwzu r9,16(r4); \ | |
| 702 | stw r6,4(r3); \ | |
| 703 | stw r7,8(r3); \ | |
| 704 | stw r8,12(r3); \ | |
| 705 | stwu r9,16(r3) | |
| 706 | ||
| 707 | _GLOBAL(copy_page) | |
| 708 | addi r3,r3,-4 | |
| 709 | addi r4,r4,-4 | |
| 710 | ||
| 711 | #ifdef CONFIG_8xx | |
| 712 | /* don't use prefetch on 8xx */ | |
| 713 | li r0,4096/L1_CACHE_LINE_SIZE | |
| 714 | mtctr r0 | |
| 715 | 1: COPY_16_BYTES | |
| 716 | bdnz 1b | |
| 717 | blr | |
| 718 | ||
| 719 | #else /* not 8xx, we can prefetch */ | |
| 720 | li r5,4 | |
| 721 | ||
| 722 | #if MAX_COPY_PREFETCH > 1 | |
| 723 | li r0,MAX_COPY_PREFETCH | |
| 724 | li r11,4 | |
| 725 | mtctr r0 | |
| 726 | 11: dcbt r11,r4 | |
| 727 | addi r11,r11,L1_CACHE_LINE_SIZE | |
| 728 | bdnz 11b | |
| 729 | #else /* MAX_COPY_PREFETCH == 1 */ | |
| 730 | dcbt r5,r4 | |
| 731 | li r11,L1_CACHE_LINE_SIZE+4 | |
| 732 | #endif /* MAX_COPY_PREFETCH */ | |
| 733 | li r0,4096/L1_CACHE_LINE_SIZE - MAX_COPY_PREFETCH | |
| 734 | crclr 4*cr0+eq | |
| 735 | 2: | |
| 736 | mtctr r0 | |
| 737 | 1: | |
| 738 | dcbt r11,r4 | |
| 739 | dcbz r5,r3 | |
| 740 | COPY_16_BYTES | |
| 741 | #if L1_CACHE_LINE_SIZE >= 32 | |
| 742 | COPY_16_BYTES | |
| 743 | #if L1_CACHE_LINE_SIZE >= 64 | |
| 744 | COPY_16_BYTES | |
| 745 | COPY_16_BYTES | |
| 746 | #if L1_CACHE_LINE_SIZE >= 128 | |
| 747 | COPY_16_BYTES | |
| 748 | COPY_16_BYTES | |
| 749 | COPY_16_BYTES | |
| 750 | COPY_16_BYTES | |
| 751 | #endif | |
| 752 | #endif | |
| 753 | #endif | |
| 754 | bdnz 1b | |
| 755 | beqlr | |
| 756 | crnot 4*cr0+eq,4*cr0+eq | |
| 757 | li r0,MAX_COPY_PREFETCH | |
| 758 | li r11,4 | |
| 759 | b 2b | |
| 760 | #endif /* CONFIG_8xx */ | |
| 761 | ||
| 762 | /* | |
| 763 | * void atomic_clear_mask(atomic_t mask, atomic_t *addr) | |
| 764 | * void atomic_set_mask(atomic_t mask, atomic_t *addr); | |
| 765 | */ | |
| 766 | _GLOBAL(atomic_clear_mask) | |
| 767 | 10: lwarx r5,0,r4 | |
| 768 | andc r5,r5,r3 | |
| 769 | PPC405_ERR77(0,r4) | |
| 770 | stwcx. r5,0,r4 | |
| 771 | bne- 10b | |
| 772 | blr | |
| 773 | _GLOBAL(atomic_set_mask) | |
| 774 | 10: lwarx r5,0,r4 | |
| 775 | or r5,r5,r3 | |
| 776 | PPC405_ERR77(0,r4) | |
| 777 | stwcx. r5,0,r4 | |
| 778 | bne- 10b | |
| 779 | blr | |
| 780 | ||
| 781 | /* | |
| 782 | * I/O string operations | |
| 783 | * | |
| 784 | * insb(port, buf, len) | |
| 785 | * outsb(port, buf, len) | |
| 786 | * insw(port, buf, len) | |
| 787 | * outsw(port, buf, len) | |
| 788 | * insl(port, buf, len) | |
| 789 | * outsl(port, buf, len) | |
| 790 | * insw_ns(port, buf, len) | |
| 791 | * outsw_ns(port, buf, len) | |
| 792 | * insl_ns(port, buf, len) | |
| 793 | * outsl_ns(port, buf, len) | |
| 794 | * | |
| 795 | * The *_ns versions don't do byte-swapping. | |
| 796 | */ | |
| 797 | _GLOBAL(_insb) | |
| 798 | cmpwi 0,r5,0 | |
| 799 | mtctr r5 | |
| 800 | subi r4,r4,1 | |
| 801 | blelr- | |
| 802 | 00: lbz r5,0(r3) | |
| 803 | eieio | |
| 804 | stbu r5,1(r4) | |
| 805 | bdnz 00b | |
| 806 | blr | |
| 807 | ||
| 808 | _GLOBAL(_outsb) | |
| 809 | cmpwi 0,r5,0 | |
| 810 | mtctr r5 | |
| 811 | subi r4,r4,1 | |
| 812 | blelr- | |
| 813 | 00: lbzu r5,1(r4) | |
| 814 | stb r5,0(r3) | |
| 815 | eieio | |
| 816 | bdnz 00b | |
| 817 | blr | |
| 818 | ||
| 819 | _GLOBAL(_insw) | |
| 820 | cmpwi 0,r5,0 | |
| 821 | mtctr r5 | |
| 822 | subi r4,r4,2 | |
| 823 | blelr- | |
| 824 | 00: lhbrx r5,0,r3 | |
| 825 | eieio | |
| 826 | sthu r5,2(r4) | |
| 827 | bdnz 00b | |
| 828 | blr | |
| 829 | ||
| 830 | _GLOBAL(_outsw) | |
| 831 | cmpwi 0,r5,0 | |
| 832 | mtctr r5 | |
| 833 | subi r4,r4,2 | |
| 834 | blelr- | |
| 835 | 00: lhzu r5,2(r4) | |
| 836 | eieio | |
| 837 | sthbrx r5,0,r3 | |
| 838 | bdnz 00b | |
| 839 | blr | |
| 840 | ||
| 841 | _GLOBAL(_insl) | |
| 842 | cmpwi 0,r5,0 | |
| 843 | mtctr r5 | |
| 844 | subi r4,r4,4 | |
| 845 | blelr- | |
| 846 | 00: lwbrx r5,0,r3 | |
| 847 | eieio | |
| 848 | stwu r5,4(r4) | |
| 849 | bdnz 00b | |
| 850 | blr | |
| 851 | ||
| 852 | _GLOBAL(_outsl) | |
| 853 | cmpwi 0,r5,0 | |
| 854 | mtctr r5 | |
| 855 | subi r4,r4,4 | |
| 856 | blelr- | |
| 857 | 00: lwzu r5,4(r4) | |
| 858 | stwbrx r5,0,r3 | |
| 859 | eieio | |
| 860 | bdnz 00b | |
| 861 | blr | |
| 862 | ||
| 863 | _GLOBAL(__ide_mm_insw) | |
| 864 | _GLOBAL(_insw_ns) | |
| 865 | cmpwi 0,r5,0 | |
| 866 | mtctr r5 | |
| 867 | subi r4,r4,2 | |
| 868 | blelr- | |
| 869 | 00: lhz r5,0(r3) | |
| 870 | eieio | |
| 871 | sthu r5,2(r4) | |
| 872 | bdnz 00b | |
| 873 | blr | |
| 874 | ||
| 875 | _GLOBAL(__ide_mm_outsw) | |
| 876 | _GLOBAL(_outsw_ns) | |
| 877 | cmpwi 0,r5,0 | |
| 878 | mtctr r5 | |
| 879 | subi r4,r4,2 | |
| 880 | blelr- | |
| 881 | 00: lhzu r5,2(r4) | |
| 882 | sth r5,0(r3) | |
| 883 | eieio | |
| 884 | bdnz 00b | |
| 885 | blr | |
| 886 | ||
| 887 | _GLOBAL(__ide_mm_insl) | |
| 888 | _GLOBAL(_insl_ns) | |
| 889 | cmpwi 0,r5,0 | |
| 890 | mtctr r5 | |
| 891 | subi r4,r4,4 | |
| 892 | blelr- | |
| 893 | 00: lwz r5,0(r3) | |
| 894 | eieio | |
| 895 | stwu r5,4(r4) | |
| 896 | bdnz 00b | |
| 897 | blr | |
| 898 | ||
| 899 | _GLOBAL(__ide_mm_outsl) | |
| 900 | _GLOBAL(_outsl_ns) | |
| 901 | cmpwi 0,r5,0 | |
| 902 | mtctr r5 | |
| 903 | subi r4,r4,4 | |
| 904 | blelr- | |
| 905 | 00: lwzu r5,4(r4) | |
| 906 | stw r5,0(r3) | |
| 907 | eieio | |
| 908 | bdnz 00b | |
| 909 | blr | |
| 910 | ||
| 911 | /* | |
| 912 | * Extended precision shifts. | |
| 913 | * | |
| 914 | * Updated to be valid for shift counts from 0 to 63 inclusive. | |
| 915 | * -- Gabriel | |
| 916 | * | |
| 917 | * R3/R4 has 64 bit value | |
| 918 | * R5 has shift count | |
| 919 | * result in R3/R4 | |
| 920 | * | |
| 921 | * ashrdi3: arithmetic right shift (sign propagation) | |
| 922 | * lshrdi3: logical right shift | |
| 923 | * ashldi3: left shift | |
| 924 | */ | |
| 925 | _GLOBAL(__ashrdi3) | |
| 926 | subfic r6,r5,32 | |
| 927 | srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count | |
| 928 | addi r7,r5,32 # could be xori, or addi with -32 | |
| 929 | slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) | |
| 930 | rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 | |
| 931 | sraw r7,r3,r7 # t2 = MSW >> (count-32) | |
| 932 | or r4,r4,r6 # LSW |= t1 | |
| 933 | slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 | |
| 934 | sraw r3,r3,r5 # MSW = MSW >> count | |
| 935 | or r4,r4,r7 # LSW |= t2 | |
| 936 | blr | |
| 937 | ||
| 938 | _GLOBAL(__ashldi3) | |
| 939 | subfic r6,r5,32 | |
| 940 | slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count | |
| 941 | addi r7,r5,32 # could be xori, or addi with -32 | |
| 942 | srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) | |
| 943 | slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) | |
| 944 | or r3,r3,r6 # MSW |= t1 | |
| 945 | slw r4,r4,r5 # LSW = LSW << count | |
| 946 | or r3,r3,r7 # MSW |= t2 | |
| 947 | blr | |
| 948 | ||
| 949 | _GLOBAL(__lshrdi3) | |
| 950 | subfic r6,r5,32 | |
| 951 | srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count | |
| 952 | addi r7,r5,32 # could be xori, or addi with -32 | |
| 953 | slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) | |
| 954 | srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) | |
| 955 | or r4,r4,r6 # LSW |= t1 | |
| 956 | srw r3,r3,r5 # MSW = MSW >> count | |
| 957 | or r4,r4,r7 # LSW |= t2 | |
| 958 | blr | |
| 959 | ||
| 960 | _GLOBAL(abs) | |
| 961 | srawi r4,r3,31 | |
| 962 | xor r3,r3,r4 | |
| 963 | sub r3,r3,r4 | |
| 964 | blr | |
| 965 | ||
| 966 | _GLOBAL(_get_SP) | |
| 967 | mr r3,r1 /* Close enough */ | |
| 968 | blr | |
| 969 | ||
| 970 | /* | |
| 971 | * These are used in the alignment trap handler when emulating | |
| 972 | * single-precision loads and stores. | |
| 973 | * We restore and save the fpscr so the task gets the same result | |
| 974 | * and exceptions as if the cpu had performed the load or store. | |
| 975 | */ | |
| 976 | ||
| 977 | #ifdef CONFIG_PPC_FPU | |
| 978 | _GLOBAL(cvt_fd) | |
| 979 | lfd 0,-4(r5) /* load up fpscr value */ | |
| 980 | mtfsf 0xff,0 | |
| 981 | lfs 0,0(r3) | |
| 982 | stfd 0,0(r4) | |
| 983 | mffs 0 /* save new fpscr value */ | |
| 984 | stfd 0,-4(r5) | |
| 985 | blr | |
| 986 | ||
| 987 | _GLOBAL(cvt_df) | |
| 988 | lfd 0,-4(r5) /* load up fpscr value */ | |
| 989 | mtfsf 0xff,0 | |
| 990 | lfd 0,0(r3) | |
| 991 | stfs 0,0(r4) | |
| 992 | mffs 0 /* save new fpscr value */ | |
| 993 | stfd 0,-4(r5) | |
| 994 | blr | |
| 995 | #endif | |
| 996 | ||
| 997 | /* | |
| 998 | * Create a kernel thread | |
| 999 | * kernel_thread(fn, arg, flags) | |
| 1000 | */ | |
| 1001 | _GLOBAL(kernel_thread) | |
| 1002 | stwu r1,-16(r1) | |
| 1003 | stw r30,8(r1) | |
| 1004 | stw r31,12(r1) | |
| 1005 | mr r30,r3 /* function */ | |
| 1006 | mr r31,r4 /* argument */ | |
| 1007 | ori r3,r5,CLONE_VM /* flags */ | |
| 1008 | oris r3,r3,CLONE_UNTRACED>>16 | |
| 1009 | li r4,0 /* new sp (unused) */ | |
| 1010 | li r0,__NR_clone | |
| 1011 | sc | |
| 1012 | cmpwi 0,r3,0 /* parent or child? */ | |
| 1013 | bne 1f /* return if parent */ | |
| 1014 | li r0,0 /* make top-level stack frame */ | |
| 1015 | stwu r0,-16(r1) | |
| 1016 | mtlr r30 /* fn addr in lr */ | |
| 1017 | mr r3,r31 /* load arg and call fn */ | |
| 1018 | PPC440EP_ERR42 | |
| 1019 | blrl | |
| 1020 | li r0,__NR_exit /* exit if function returns */ | |
| 1021 | li r3,0 | |
| 1022 | sc | |
| 1023 | 1: lwz r30,8(r1) | |
| 1024 | lwz r31,12(r1) | |
| 1025 | addi r1,r1,16 | |
| 1026 | blr | |
| 1027 | ||
| 1028 | _GLOBAL(execve) | |
| 1029 | li r0,__NR_execve | |
| 1030 | sc | |
| 1031 | bnslr | |
| 1032 | neg r3,r3 | |
| 1033 | blr | |
| 1034 | ||
| 1035 | /* | |
| 1036 | * This routine is just here to keep GCC happy - sigh... | |
| 1037 | */ | |
| 1038 | _GLOBAL(__main) | |
| 1039 | blr |