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 * kexec bits: 9 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> 10 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 */ 18 19#include <linux/sys.h> 20#include <asm/unistd.h> 21#include <asm/errno.h> 22#include <asm/reg.h> 23#include <asm/page.h> 24#include <asm/cache.h> 25#include <asm/cputable.h> 26#include <asm/mmu.h> 27#include <asm/ppc_asm.h> 28#include <asm/thread_info.h> 29#include <asm/asm-offsets.h> 30#include <asm/processor.h> 31#include <asm/kexec.h> 32#include <asm/bug.h> 33 34 .text 35 36#ifdef CONFIG_IRQSTACKS 37_GLOBAL(call_do_softirq) 38 mflr r0 39 stw r0,4(r1) 40 stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) 41 mr r1,r3 42 bl __do_softirq 43 lwz r1,0(r1) 44 lwz r0,4(r1) 45 mtlr r0 46 blr 47 48_GLOBAL(call_handle_irq) 49 mflr r0 50 stw r0,4(r1) 51 mtctr r6 52 stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) 53 mr r1,r5 54 bctrl 55 lwz r1,0(r1) 56 lwz r0,4(r1) 57 mtlr r0 58 blr 59#endif /* CONFIG_IRQSTACKS */ 60 61/* 62 * This returns the high 64 bits of the product of two 64-bit numbers. 63 */ 64_GLOBAL(mulhdu) 65 cmpwi r6,0 66 cmpwi cr1,r3,0 67 mr r10,r4 68 mulhwu r4,r4,r5 69 beq 1f 70 mulhwu r0,r10,r6 71 mullw r7,r10,r5 72 addc r7,r0,r7 73 addze r4,r4 741: beqlr cr1 /* all done if high part of A is 0 */ 75 mr r10,r3 76 mullw r9,r3,r5 77 mulhwu r3,r3,r5 78 beq 2f 79 mullw r0,r10,r6 80 mulhwu r8,r10,r6 81 addc r7,r0,r7 82 adde r4,r4,r8 83 addze r3,r3 842: addc r4,r4,r9 85 addze r3,r3 86 blr 87 88/* 89 * sub_reloc_offset(x) returns x - reloc_offset(). 90 */ 91_GLOBAL(sub_reloc_offset) 92 mflr r0 93 bl 1f 941: mflr r5 95 lis r4,1b@ha 96 addi r4,r4,1b@l 97 subf r5,r4,r5 98 subf r3,r5,r3 99 mtlr r0 100 blr 101 102/* 103 * reloc_got2 runs through the .got2 section adding an offset 104 * to each entry. 105 */ 106_GLOBAL(reloc_got2) 107 mflr r11 108 lis r7,__got2_start@ha 109 addi r7,r7,__got2_start@l 110 lis r8,__got2_end@ha 111 addi r8,r8,__got2_end@l 112 subf r8,r7,r8 113 srwi. r8,r8,2 114 beqlr 115 mtctr r8 116 bl 1f 1171: mflr r0 118 lis r4,1b@ha 119 addi r4,r4,1b@l 120 subf r0,r4,r0 121 add r7,r0,r7 1222: lwz r0,0(r7) 123 add r0,r0,r3 124 stw r0,0(r7) 125 addi r7,r7,4 126 bdnz 2b 127 mtlr r11 128 blr 129 130/* 131 * call_setup_cpu - call the setup_cpu function for this cpu 132 * r3 = data offset, r24 = cpu number 133 * 134 * Setup function is called with: 135 * r3 = data offset 136 * r4 = ptr to CPU spec (relocated) 137 */ 138_GLOBAL(call_setup_cpu) 139 addis r4,r3,cur_cpu_spec@ha 140 addi r4,r4,cur_cpu_spec@l 141 lwz r4,0(r4) 142 add r4,r4,r3 143 lwz r5,CPU_SPEC_SETUP(r4) 144 cmpwi 0,r5,0 145 add r5,r5,r3 146 beqlr 147 mtctr r5 148 bctr 149 150#if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx) 151 152/* This gets called by via-pmu.c to switch the PLL selection 153 * on 750fx CPU. This function should really be moved to some 154 * other place (as most of the cpufreq code in via-pmu 155 */ 156_GLOBAL(low_choose_750fx_pll) 157 /* Clear MSR:EE */ 158 mfmsr r7 159 rlwinm r0,r7,0,17,15 160 mtmsr r0 161 162 /* If switching to PLL1, disable HID0:BTIC */ 163 cmplwi cr0,r3,0 164 beq 1f 165 mfspr r5,SPRN_HID0 166 rlwinm r5,r5,0,27,25 167 sync 168 mtspr SPRN_HID0,r5 169 isync 170 sync 171 1721: 173 /* Calc new HID1 value */ 174 mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */ 175 rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */ 176 rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */ 177 or r4,r4,r5 178 mtspr SPRN_HID1,r4 179 180 /* Store new HID1 image */ 181 rlwinm r6,r1,0,0,(31-THREAD_SHIFT) 182 lwz r6,TI_CPU(r6) 183 slwi r6,r6,2 184 addis r6,r6,nap_save_hid1@ha 185 stw r4,nap_save_hid1@l(r6) 186 187 /* If switching to PLL0, enable HID0:BTIC */ 188 cmplwi cr0,r3,0 189 bne 1f 190 mfspr r5,SPRN_HID0 191 ori r5,r5,HID0_BTIC 192 sync 193 mtspr SPRN_HID0,r5 194 isync 195 sync 196 1971: 198 /* Return */ 199 mtmsr r7 200 blr 201 202_GLOBAL(low_choose_7447a_dfs) 203 /* Clear MSR:EE */ 204 mfmsr r7 205 rlwinm r0,r7,0,17,15 206 mtmsr r0 207 208 /* Calc new HID1 value */ 209 mfspr r4,SPRN_HID1 210 insrwi r4,r3,1,9 /* insert parameter into bit 9 */ 211 sync 212 mtspr SPRN_HID1,r4 213 sync 214 isync 215 216 /* Return */ 217 mtmsr r7 218 blr 219 220#endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */ 221 222/* 223 * complement mask on the msr then "or" some values on. 224 * _nmask_and_or_msr(nmask, value_to_or) 225 */ 226_GLOBAL(_nmask_and_or_msr) 227 mfmsr r0 /* Get current msr */ 228 andc r0,r0,r3 /* And off the bits set in r3 (first parm) */ 229 or r0,r0,r4 /* Or on the bits in r4 (second parm) */ 230 SYNC /* Some chip revs have problems here... */ 231 mtmsr r0 /* Update machine state */ 232 isync 233 blr /* Done */ 234 235#ifdef CONFIG_40x 236 237/* 238 * Do an IO access in real mode 239 */ 240_GLOBAL(real_readb) 241 mfmsr r7 242 ori r0,r7,MSR_DR 243 xori r0,r0,MSR_DR 244 sync 245 mtmsr r0 246 sync 247 isync 248 lbz r3,0(r3) 249 sync 250 mtmsr r7 251 sync 252 isync 253 blr 254 255 /* 256 * Do an IO access in real mode 257 */ 258_GLOBAL(real_writeb) 259 mfmsr r7 260 ori r0,r7,MSR_DR 261 xori r0,r0,MSR_DR 262 sync 263 mtmsr r0 264 sync 265 isync 266 stb r3,0(r4) 267 sync 268 mtmsr r7 269 sync 270 isync 271 blr 272 273#endif /* CONFIG_40x */ 274 275 276/* 277 * Flush instruction cache. 278 * This is a no-op on the 601. 279 */ 280_GLOBAL(flush_instruction_cache) 281#if defined(CONFIG_8xx) 282 isync 283 lis r5, IDC_INVALL@h 284 mtspr SPRN_IC_CST, r5 285#elif defined(CONFIG_4xx) 286#ifdef CONFIG_403GCX 287 li r3, 512 288 mtctr r3 289 lis r4, KERNELBASE@h 2901: iccci 0, r4 291 addi r4, r4, 16 292 bdnz 1b 293#else 294 lis r3, KERNELBASE@h 295 iccci 0,r3 296#endif 297#elif CONFIG_FSL_BOOKE 298BEGIN_FTR_SECTION 299 mfspr r3,SPRN_L1CSR0 300 ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC 301 /* msync; isync recommended here */ 302 mtspr SPRN_L1CSR0,r3 303 isync 304 blr 305END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE) 306 mfspr r3,SPRN_L1CSR1 307 ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR 308 mtspr SPRN_L1CSR1,r3 309#else 310 mfspr r3,SPRN_PVR 311 rlwinm r3,r3,16,16,31 312 cmpwi 0,r3,1 313 beqlr /* for 601, do nothing */ 314 /* 603/604 processor - use invalidate-all bit in HID0 */ 315 mfspr r3,SPRN_HID0 316 ori r3,r3,HID0_ICFI 317 mtspr SPRN_HID0,r3 318#endif /* CONFIG_8xx/4xx */ 319 isync 320 blr 321 322/* 323 * Write any modified data cache blocks out to memory 324 * and invalidate the corresponding instruction cache blocks. 325 * This is a no-op on the 601. 326 * 327 * flush_icache_range(unsigned long start, unsigned long stop) 328 */ 329_KPROBE(__flush_icache_range) 330BEGIN_FTR_SECTION 331 blr /* for 601, do nothing */ 332END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) 333 li r5,L1_CACHE_BYTES-1 334 andc r3,r3,r5 335 subf r4,r3,r4 336 add r4,r4,r5 337 srwi. r4,r4,L1_CACHE_SHIFT 338 beqlr 339 mtctr r4 340 mr r6,r3 3411: dcbst 0,r3 342 addi r3,r3,L1_CACHE_BYTES 343 bdnz 1b 344 sync /* wait for dcbst's to get to ram */ 345#ifndef CONFIG_44x 346 mtctr r4 3472: icbi 0,r6 348 addi r6,r6,L1_CACHE_BYTES 349 bdnz 2b 350#else 351 /* Flash invalidate on 44x because we are passed kmapped addresses and 352 this doesn't work for userspace pages due to the virtually tagged 353 icache. Sigh. */ 354 iccci 0, r0 355#endif 356 sync /* additional sync needed on g4 */ 357 isync 358 blr 359/* 360 * Write any modified data cache blocks out to memory. 361 * Does not invalidate the corresponding cache lines (especially for 362 * any corresponding instruction cache). 363 * 364 * clean_dcache_range(unsigned long start, unsigned long stop) 365 */ 366_GLOBAL(clean_dcache_range) 367 li r5,L1_CACHE_BYTES-1 368 andc r3,r3,r5 369 subf r4,r3,r4 370 add r4,r4,r5 371 srwi. r4,r4,L1_CACHE_SHIFT 372 beqlr 373 mtctr r4 374 3751: dcbst 0,r3 376 addi r3,r3,L1_CACHE_BYTES 377 bdnz 1b 378 sync /* wait for dcbst's to get to ram */ 379 blr 380 381/* 382 * Write any modified data cache blocks out to memory and invalidate them. 383 * Does not invalidate the corresponding instruction cache blocks. 384 * 385 * flush_dcache_range(unsigned long start, unsigned long stop) 386 */ 387_GLOBAL(flush_dcache_range) 388 li r5,L1_CACHE_BYTES-1 389 andc r3,r3,r5 390 subf r4,r3,r4 391 add r4,r4,r5 392 srwi. r4,r4,L1_CACHE_SHIFT 393 beqlr 394 mtctr r4 395 3961: dcbf 0,r3 397 addi r3,r3,L1_CACHE_BYTES 398 bdnz 1b 399 sync /* wait for dcbst's to get to ram */ 400 blr 401 402/* 403 * Like above, but invalidate the D-cache. This is used by the 8xx 404 * to invalidate the cache so the PPC core doesn't get stale data 405 * from the CPM (no cache snooping here :-). 406 * 407 * invalidate_dcache_range(unsigned long start, unsigned long stop) 408 */ 409_GLOBAL(invalidate_dcache_range) 410 li r5,L1_CACHE_BYTES-1 411 andc r3,r3,r5 412 subf r4,r3,r4 413 add r4,r4,r5 414 srwi. r4,r4,L1_CACHE_SHIFT 415 beqlr 416 mtctr r4 417 4181: dcbi 0,r3 419 addi r3,r3,L1_CACHE_BYTES 420 bdnz 1b 421 sync /* wait for dcbi's to get to ram */ 422 blr 423 424/* 425 * Flush a particular page from the data cache to RAM. 426 * Note: this is necessary because the instruction cache does *not* 427 * snoop from the data cache. 428 * This is a no-op on the 601 which has a unified cache. 429 * 430 * void __flush_dcache_icache(void *page) 431 */ 432_GLOBAL(__flush_dcache_icache) 433BEGIN_FTR_SECTION 434 blr 435END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) 436 rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */ 437 li r4,PAGE_SIZE/L1_CACHE_BYTES /* Number of lines in a page */ 438 mtctr r4 439 mr r6,r3 4400: dcbst 0,r3 /* Write line to ram */ 441 addi r3,r3,L1_CACHE_BYTES 442 bdnz 0b 443 sync 444#ifdef CONFIG_44x 445 /* We don't flush the icache on 44x. Those have a virtual icache 446 * and we don't have access to the virtual address here (it's 447 * not the page vaddr but where it's mapped in user space). The 448 * flushing of the icache on these is handled elsewhere, when 449 * a change in the address space occurs, before returning to 450 * user space 451 */ 452BEGIN_MMU_FTR_SECTION 453 blr 454END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x) 455#endif /* CONFIG_44x */ 456 mtctr r4 4571: icbi 0,r6 458 addi r6,r6,L1_CACHE_BYTES 459 bdnz 1b 460 sync 461 isync 462 blr 463 464#ifndef CONFIG_BOOKE 465/* 466 * Flush a particular page from the data cache to RAM, identified 467 * by its physical address. We turn off the MMU so we can just use 468 * the physical address (this may be a highmem page without a kernel 469 * mapping). 470 * 471 * void __flush_dcache_icache_phys(unsigned long physaddr) 472 */ 473_GLOBAL(__flush_dcache_icache_phys) 474BEGIN_FTR_SECTION 475 blr /* for 601, do nothing */ 476END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) 477 mfmsr r10 478 rlwinm r0,r10,0,28,26 /* clear DR */ 479 mtmsr r0 480 isync 481 rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */ 482 li r4,PAGE_SIZE/L1_CACHE_BYTES /* Number of lines in a page */ 483 mtctr r4 484 mr r6,r3 4850: dcbst 0,r3 /* Write line to ram */ 486 addi r3,r3,L1_CACHE_BYTES 487 bdnz 0b 488 sync 489 mtctr r4 4901: icbi 0,r6 491 addi r6,r6,L1_CACHE_BYTES 492 bdnz 1b 493 sync 494 mtmsr r10 /* restore DR */ 495 isync 496 blr 497#endif /* CONFIG_BOOKE */ 498 499/* 500 * Clear pages using the dcbz instruction, which doesn't cause any 501 * memory traffic (except to write out any cache lines which get 502 * displaced). This only works on cacheable memory. 503 * 504 * void clear_pages(void *page, int order) ; 505 */ 506_GLOBAL(clear_pages) 507 li r0,PAGE_SIZE/L1_CACHE_BYTES 508 slw r0,r0,r4 509 mtctr r0 5101: dcbz 0,r3 511 addi r3,r3,L1_CACHE_BYTES 512 bdnz 1b 513 blr 514 515/* 516 * Copy a whole page. We use the dcbz instruction on the destination 517 * to reduce memory traffic (it eliminates the unnecessary reads of 518 * the destination into cache). This requires that the destination 519 * is cacheable. 520 */ 521#define COPY_16_BYTES \ 522 lwz r6,4(r4); \ 523 lwz r7,8(r4); \ 524 lwz r8,12(r4); \ 525 lwzu r9,16(r4); \ 526 stw r6,4(r3); \ 527 stw r7,8(r3); \ 528 stw r8,12(r3); \ 529 stwu r9,16(r3) 530 531_GLOBAL(copy_page) 532 addi r3,r3,-4 533 addi r4,r4,-4 534 535 li r5,4 536 537#if MAX_COPY_PREFETCH > 1 538 li r0,MAX_COPY_PREFETCH 539 li r11,4 540 mtctr r0 54111: dcbt r11,r4 542 addi r11,r11,L1_CACHE_BYTES 543 bdnz 11b 544#else /* MAX_COPY_PREFETCH == 1 */ 545 dcbt r5,r4 546 li r11,L1_CACHE_BYTES+4 547#endif /* MAX_COPY_PREFETCH */ 548 li r0,PAGE_SIZE/L1_CACHE_BYTES - MAX_COPY_PREFETCH 549 crclr 4*cr0+eq 5502: 551 mtctr r0 5521: 553 dcbt r11,r4 554 dcbz r5,r3 555 COPY_16_BYTES 556#if L1_CACHE_BYTES >= 32 557 COPY_16_BYTES 558#if L1_CACHE_BYTES >= 64 559 COPY_16_BYTES 560 COPY_16_BYTES 561#if L1_CACHE_BYTES >= 128 562 COPY_16_BYTES 563 COPY_16_BYTES 564 COPY_16_BYTES 565 COPY_16_BYTES 566#endif 567#endif 568#endif 569 bdnz 1b 570 beqlr 571 crnot 4*cr0+eq,4*cr0+eq 572 li r0,MAX_COPY_PREFETCH 573 li r11,4 574 b 2b 575 576/* 577 * void atomic_clear_mask(atomic_t mask, atomic_t *addr) 578 * void atomic_set_mask(atomic_t mask, atomic_t *addr); 579 */ 580_GLOBAL(atomic_clear_mask) 58110: lwarx r5,0,r4 582 andc r5,r5,r3 583 PPC405_ERR77(0,r4) 584 stwcx. r5,0,r4 585 bne- 10b 586 blr 587_GLOBAL(atomic_set_mask) 58810: lwarx r5,0,r4 589 or r5,r5,r3 590 PPC405_ERR77(0,r4) 591 stwcx. r5,0,r4 592 bne- 10b 593 blr 594 595/* 596 * Extended precision shifts. 597 * 598 * Updated to be valid for shift counts from 0 to 63 inclusive. 599 * -- Gabriel 600 * 601 * R3/R4 has 64 bit value 602 * R5 has shift count 603 * result in R3/R4 604 * 605 * ashrdi3: arithmetic right shift (sign propagation) 606 * lshrdi3: logical right shift 607 * ashldi3: left shift 608 */ 609_GLOBAL(__ashrdi3) 610 subfic r6,r5,32 611 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count 612 addi r7,r5,32 # could be xori, or addi with -32 613 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) 614 rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 615 sraw r7,r3,r7 # t2 = MSW >> (count-32) 616 or r4,r4,r6 # LSW |= t1 617 slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 618 sraw r3,r3,r5 # MSW = MSW >> count 619 or r4,r4,r7 # LSW |= t2 620 blr 621 622_GLOBAL(__ashldi3) 623 subfic r6,r5,32 624 slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count 625 addi r7,r5,32 # could be xori, or addi with -32 626 srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) 627 slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) 628 or r3,r3,r6 # MSW |= t1 629 slw r4,r4,r5 # LSW = LSW << count 630 or r3,r3,r7 # MSW |= t2 631 blr 632 633_GLOBAL(__lshrdi3) 634 subfic r6,r5,32 635 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count 636 addi r7,r5,32 # could be xori, or addi with -32 637 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) 638 srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) 639 or r4,r4,r6 # LSW |= t1 640 srw r3,r3,r5 # MSW = MSW >> count 641 or r4,r4,r7 # LSW |= t2 642 blr 643 644/* 645 * 64-bit comparison: __ucmpdi2(u64 a, u64 b) 646 * Returns 0 if a < b, 1 if a == b, 2 if a > b. 647 */ 648_GLOBAL(__ucmpdi2) 649 cmplw r3,r5 650 li r3,1 651 bne 1f 652 cmplw r4,r6 653 beqlr 6541: li r3,0 655 bltlr 656 li r3,2 657 blr 658 659_GLOBAL(abs) 660 srawi r4,r3,31 661 xor r3,r3,r4 662 sub r3,r3,r4 663 blr 664 665/* 666 * Create a kernel thread 667 * kernel_thread(fn, arg, flags) 668 */ 669_GLOBAL(kernel_thread) 670 stwu r1,-16(r1) 671 stw r30,8(r1) 672 stw r31,12(r1) 673 mr r30,r3 /* function */ 674 mr r31,r4 /* argument */ 675 ori r3,r5,CLONE_VM /* flags */ 676 oris r3,r3,CLONE_UNTRACED>>16 677 li r4,0 /* new sp (unused) */ 678 li r0,__NR_clone 679 sc 680 bns+ 1f /* did system call indicate error? */ 681 neg r3,r3 /* if so, make return code negative */ 6821: cmpwi 0,r3,0 /* parent or child? */ 683 bne 2f /* return if parent */ 684 li r0,0 /* make top-level stack frame */ 685 stwu r0,-16(r1) 686 mtlr r30 /* fn addr in lr */ 687 mr r3,r31 /* load arg and call fn */ 688 PPC440EP_ERR42 689 blrl 690 li r0,__NR_exit /* exit if function returns */ 691 li r3,0 692 sc 6932: lwz r30,8(r1) 694 lwz r31,12(r1) 695 addi r1,r1,16 696 blr 697 698/* 699 * This routine is just here to keep GCC happy - sigh... 700 */ 701_GLOBAL(__main) 702 blr 703 704#ifdef CONFIG_KEXEC 705 /* 706 * Must be relocatable PIC code callable as a C function. 707 */ 708 .globl relocate_new_kernel 709relocate_new_kernel: 710 /* r3 = page_list */ 711 /* r4 = reboot_code_buffer */ 712 /* r5 = start_address */ 713 714 li r0, 0 715 716 /* 717 * Set Machine Status Register to a known status, 718 * switch the MMU off and jump to 1: in a single step. 719 */ 720 721 mr r8, r0 722 ori r8, r8, MSR_RI|MSR_ME 723 mtspr SPRN_SRR1, r8 724 addi r8, r4, 1f - relocate_new_kernel 725 mtspr SPRN_SRR0, r8 726 sync 727 rfi 728 7291: 730 /* from this point address translation is turned off */ 731 /* and interrupts are disabled */ 732 733 /* set a new stack at the bottom of our page... */ 734 /* (not really needed now) */ 735 addi r1, r4, KEXEC_CONTROL_PAGE_SIZE - 8 /* for LR Save+Back Chain */ 736 stw r0, 0(r1) 737 738 /* Do the copies */ 739 li r6, 0 /* checksum */ 740 mr r0, r3 741 b 1f 742 7430: /* top, read another word for the indirection page */ 744 lwzu r0, 4(r3) 745 7461: 747 /* is it a destination page? (r8) */ 748 rlwinm. r7, r0, 0, 31, 31 /* IND_DESTINATION (1<<0) */ 749 beq 2f 750 751 rlwinm r8, r0, 0, 0, 19 /* clear kexec flags, page align */ 752 b 0b 753 7542: /* is it an indirection page? (r3) */ 755 rlwinm. r7, r0, 0, 30, 30 /* IND_INDIRECTION (1<<1) */ 756 beq 2f 757 758 rlwinm r3, r0, 0, 0, 19 /* clear kexec flags, page align */ 759 subi r3, r3, 4 760 b 0b 761 7622: /* are we done? */ 763 rlwinm. r7, r0, 0, 29, 29 /* IND_DONE (1<<2) */ 764 beq 2f 765 b 3f 766 7672: /* is it a source page? (r9) */ 768 rlwinm. r7, r0, 0, 28, 28 /* IND_SOURCE (1<<3) */ 769 beq 0b 770 771 rlwinm r9, r0, 0, 0, 19 /* clear kexec flags, page align */ 772 773 li r7, PAGE_SIZE / 4 774 mtctr r7 775 subi r9, r9, 4 776 subi r8, r8, 4 7779: 778 lwzu r0, 4(r9) /* do the copy */ 779 xor r6, r6, r0 780 stwu r0, 4(r8) 781 dcbst 0, r8 782 sync 783 icbi 0, r8 784 bdnz 9b 785 786 addi r9, r9, 4 787 addi r8, r8, 4 788 b 0b 789 7903: 791 792 /* To be certain of avoiding problems with self-modifying code 793 * execute a serializing instruction here. 794 */ 795 isync 796 sync 797 798 /* jump to the entry point, usually the setup routine */ 799 mtlr r5 800 blrl 801 8021: b 1b 803 804relocate_new_kernel_end: 805 806 .globl relocate_new_kernel_size 807relocate_new_kernel_size: 808 .long relocate_new_kernel_end - relocate_new_kernel 809#endif 810