1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Boot code and exception vectors for Book3E processors 4 * 5 * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp. 6 */ 7 8#include <linux/linkage.h> 9#include <linux/threads.h> 10#include <asm/reg.h> 11#include <asm/page.h> 12#include <asm/ppc_asm.h> 13#include <asm/asm-offsets.h> 14#include <asm/cputable.h> 15#include <asm/setup.h> 16#include <asm/thread_info.h> 17#include <asm/exception-64e.h> 18#include <asm/bug.h> 19#include <asm/irqflags.h> 20#include <asm/ptrace.h> 21#include <asm/ppc-opcode.h> 22#include <asm/mmu.h> 23#include <asm/hw_irq.h> 24#include <asm/kvm_asm.h> 25#include <asm/kvm_booke_hv_asm.h> 26#include <asm/feature-fixups.h> 27#include <asm/context_tracking.h> 28 29/* 64e interrupt returns always use SRR registers */ 30#define fast_interrupt_return fast_interrupt_return_srr 31#define interrupt_return interrupt_return_srr 32 33/* XXX This will ultimately add space for a special exception save 34 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc... 35 * when taking special interrupts. For now we don't support that, 36 * special interrupts from within a non-standard level will probably 37 * blow you up 38 */ 39#define SPECIAL_EXC_SRR0 0 40#define SPECIAL_EXC_SRR1 1 41#define SPECIAL_EXC_SPRG_GEN 2 42#define SPECIAL_EXC_SPRG_TLB 3 43#define SPECIAL_EXC_MAS0 4 44#define SPECIAL_EXC_MAS1 5 45#define SPECIAL_EXC_MAS2 6 46#define SPECIAL_EXC_MAS3 7 47#define SPECIAL_EXC_MAS6 8 48#define SPECIAL_EXC_MAS7 9 49#define SPECIAL_EXC_MAS5 10 /* E.HV only */ 50#define SPECIAL_EXC_MAS8 11 /* E.HV only */ 51#define SPECIAL_EXC_IRQHAPPENED 12 52#define SPECIAL_EXC_DEAR 13 53#define SPECIAL_EXC_ESR 14 54#define SPECIAL_EXC_SOFTE 15 55#define SPECIAL_EXC_CSRR0 16 56#define SPECIAL_EXC_CSRR1 17 57/* must be even to keep 16-byte stack alignment */ 58#define SPECIAL_EXC_END 18 59 60#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8) 61#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288) 62 63#define SPECIAL_EXC_STORE(reg, name) \ 64 std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) 65 66#define SPECIAL_EXC_LOAD(reg, name) \ 67 ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) 68 69SYM_CODE_START_LOCAL(special_reg_save) 70 /* 71 * We only need (or have stack space) to save this stuff if 72 * we interrupted the kernel. 73 */ 74 ld r3,_MSR(r1) 75 andi. r3,r3,MSR_PR 76 bnelr 77 78 /* 79 * Advance to the next TLB exception frame for handler 80 * types that don't do it automatically. 81 */ 82 LOAD_REG_ADDR(r11,extlb_level_exc) 83 lwz r12,0(r11) 84 mfspr r10,SPRN_SPRG_TLB_EXFRAME 85 add r10,r10,r12 86 mtspr SPRN_SPRG_TLB_EXFRAME,r10 87 88 /* 89 * Save registers needed to allow nesting of certain exceptions 90 * (such as TLB misses) inside special exception levels 91 */ 92 mfspr r10,SPRN_SRR0 93 SPECIAL_EXC_STORE(r10,SRR0) 94 mfspr r10,SPRN_SRR1 95 SPECIAL_EXC_STORE(r10,SRR1) 96 mfspr r10,SPRN_SPRG_GEN_SCRATCH 97 SPECIAL_EXC_STORE(r10,SPRG_GEN) 98 mfspr r10,SPRN_SPRG_TLB_SCRATCH 99 SPECIAL_EXC_STORE(r10,SPRG_TLB) 100 mfspr r10,SPRN_MAS0 101 SPECIAL_EXC_STORE(r10,MAS0) 102 mfspr r10,SPRN_MAS1 103 SPECIAL_EXC_STORE(r10,MAS1) 104 mfspr r10,SPRN_MAS2 105 SPECIAL_EXC_STORE(r10,MAS2) 106 mfspr r10,SPRN_MAS3 107 SPECIAL_EXC_STORE(r10,MAS3) 108 mfspr r10,SPRN_MAS6 109 SPECIAL_EXC_STORE(r10,MAS6) 110 mfspr r10,SPRN_MAS7 111 SPECIAL_EXC_STORE(r10,MAS7) 112BEGIN_FTR_SECTION 113 mfspr r10,SPRN_MAS5 114 SPECIAL_EXC_STORE(r10,MAS5) 115 mfspr r10,SPRN_MAS8 116 SPECIAL_EXC_STORE(r10,MAS8) 117 118 /* MAS5/8 could have inappropriate values if we interrupted KVM code */ 119 li r10,0 120 mtspr SPRN_MAS5,r10 121 mtspr SPRN_MAS8,r10 122END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) 123 mfspr r10,SPRN_DEAR 124 SPECIAL_EXC_STORE(r10,DEAR) 125 mfspr r10,SPRN_ESR 126 SPECIAL_EXC_STORE(r10,ESR) 127 128 ld r10,_NIP(r1) 129 SPECIAL_EXC_STORE(r10,CSRR0) 130 ld r10,_MSR(r1) 131 SPECIAL_EXC_STORE(r10,CSRR1) 132 133 blr 134SYM_CODE_END(special_reg_save) 135 136SYM_CODE_START_LOCAL(ret_from_level_except) 137 ld r3,_MSR(r1) 138 andi. r3,r3,MSR_PR 139 beq 1f 140 REST_NVGPRS(r1) 141 b interrupt_return 1421: 143 144 LOAD_REG_ADDR(r11,extlb_level_exc) 145 lwz r12,0(r11) 146 mfspr r10,SPRN_SPRG_TLB_EXFRAME 147 sub r10,r10,r12 148 mtspr SPRN_SPRG_TLB_EXFRAME,r10 149 150 /* 151 * It's possible that the special level exception interrupted a 152 * TLB miss handler, and inserted the same entry that the 153 * interrupted handler was about to insert. On CPUs without TLB 154 * write conditional, this can result in a duplicate TLB entry. 155 * Wipe all non-bolted entries to be safe. 156 * 157 * Note that this doesn't protect against any TLB misses 158 * we may take accessing the stack from here to the end of 159 * the special level exception. It's not clear how we can 160 * reasonably protect against that, but only CPUs with 161 * neither TLB write conditional nor bolted kernel memory 162 * are affected. Do any such CPUs even exist? 163 */ 164 PPC_TLBILX_ALL(0,R0) 165 166 REST_NVGPRS(r1) 167 168 SPECIAL_EXC_LOAD(r10,SRR0) 169 mtspr SPRN_SRR0,r10 170 SPECIAL_EXC_LOAD(r10,SRR1) 171 mtspr SPRN_SRR1,r10 172 SPECIAL_EXC_LOAD(r10,SPRG_GEN) 173 mtspr SPRN_SPRG_GEN_SCRATCH,r10 174 SPECIAL_EXC_LOAD(r10,SPRG_TLB) 175 mtspr SPRN_SPRG_TLB_SCRATCH,r10 176 SPECIAL_EXC_LOAD(r10,MAS0) 177 mtspr SPRN_MAS0,r10 178 SPECIAL_EXC_LOAD(r10,MAS1) 179 mtspr SPRN_MAS1,r10 180 SPECIAL_EXC_LOAD(r10,MAS2) 181 mtspr SPRN_MAS2,r10 182 SPECIAL_EXC_LOAD(r10,MAS3) 183 mtspr SPRN_MAS3,r10 184 SPECIAL_EXC_LOAD(r10,MAS6) 185 mtspr SPRN_MAS6,r10 186 SPECIAL_EXC_LOAD(r10,MAS7) 187 mtspr SPRN_MAS7,r10 188BEGIN_FTR_SECTION 189 SPECIAL_EXC_LOAD(r10,MAS5) 190 mtspr SPRN_MAS5,r10 191 SPECIAL_EXC_LOAD(r10,MAS8) 192 mtspr SPRN_MAS8,r10 193END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) 194 195 SPECIAL_EXC_LOAD(r10,DEAR) 196 mtspr SPRN_DEAR,r10 197 SPECIAL_EXC_LOAD(r10,ESR) 198 mtspr SPRN_ESR,r10 199 200 stdcx. r0,0,r1 /* to clear the reservation */ 201 202 REST_GPRS(2, 9, r1) 203 204 ld r10,_CTR(r1) 205 ld r11,_XER(r1) 206 mtctr r10 207 mtxer r11 208 209 blr 210SYM_CODE_END(ret_from_level_except) 211 212.macro ret_from_level srr0 srr1 paca_ex scratch 213 bl ret_from_level_except 214 215 ld r10,_LINK(r1) 216 ld r11,_CCR(r1) 217 ld r0,GPR13(r1) 218 mtlr r10 219 mtcr r11 220 221 REST_GPRS(10, 12, r1) 222 mtspr \scratch,r0 223 224 std r10,\paca_ex+EX_R10(r13); 225 std r11,\paca_ex+EX_R11(r13); 226 ld r10,_NIP(r1) 227 ld r11,_MSR(r1) 228 REST_GPR(0, r1) 229 REST_GPR(1, r1) 230 mtspr \srr0,r10 231 mtspr \srr1,r11 232 ld r10,\paca_ex+EX_R10(r13) 233 ld r11,\paca_ex+EX_R11(r13) 234 mfspr r13,\scratch 235.endm 236 237SYM_CODE_START_LOCAL(ret_from_crit_except) 238 ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH 239 rfci 240SYM_CODE_END(ret_from_crit_except) 241 242SYM_CODE_START_LOCAL(ret_from_mc_except) 243 ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH 244 rfmci 245SYM_CODE_END(ret_from_mc_except) 246 247/* Exception prolog code for all exceptions */ 248#define EXCEPTION_PROLOG(n, intnum, type, addition) \ 249 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \ 250 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \ 251 std r10,PACA_EX##type+EX_R10(r13); \ 252 std r11,PACA_EX##type+EX_R11(r13); \ 253 mfcr r10; /* save CR */ \ 254 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \ 255 DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \ 256 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \ 257 addition; /* additional code for that exc. */ \ 258 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \ 259 type##_SET_KSTACK; /* get special stack if necessary */\ 260 andi. r10,r11,MSR_PR; /* save stack pointer */ \ 261 beq 1f; /* branch around if supervisor */ \ 262 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\ 2631: type##_BTB_FLUSH \ 264 cmpdi cr1,r1,0; /* check if SP makes sense */ \ 265 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \ 266 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */ 267 268/* Exception type-specific macros */ 269#define GEN_SET_KSTACK \ 270 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ 271#define SPRN_GEN_SRR0 SPRN_SRR0 272#define SPRN_GEN_SRR1 SPRN_SRR1 273 274#define GDBELL_SET_KSTACK GEN_SET_KSTACK 275#define SPRN_GDBELL_SRR0 SPRN_GSRR0 276#define SPRN_GDBELL_SRR1 SPRN_GSRR1 277 278#define CRIT_SET_KSTACK \ 279 ld r1,PACA_CRIT_STACK(r13); \ 280 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 281#define SPRN_CRIT_SRR0 SPRN_CSRR0 282#define SPRN_CRIT_SRR1 SPRN_CSRR1 283 284#define DBG_SET_KSTACK \ 285 ld r1,PACA_DBG_STACK(r13); \ 286 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 287#define SPRN_DBG_SRR0 SPRN_DSRR0 288#define SPRN_DBG_SRR1 SPRN_DSRR1 289 290#define MC_SET_KSTACK \ 291 ld r1,PACA_MC_STACK(r13); \ 292 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 293#define SPRN_MC_SRR0 SPRN_MCSRR0 294#define SPRN_MC_SRR1 SPRN_MCSRR1 295 296#define GEN_BTB_FLUSH \ 297 START_BTB_FLUSH_SECTION \ 298 beq 1f; \ 299 BTB_FLUSH(r10) \ 300 1: \ 301 END_BTB_FLUSH_SECTION 302 303#define CRIT_BTB_FLUSH \ 304 START_BTB_FLUSH_SECTION \ 305 BTB_FLUSH(r10) \ 306 END_BTB_FLUSH_SECTION 307 308#define DBG_BTB_FLUSH CRIT_BTB_FLUSH 309#define MC_BTB_FLUSH CRIT_BTB_FLUSH 310#define GDBELL_BTB_FLUSH GEN_BTB_FLUSH 311 312#define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \ 313 EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n)) 314 315#define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \ 316 EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n)) 317 318#define DBG_EXCEPTION_PROLOG(n, intnum, addition) \ 319 EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n)) 320 321#define MC_EXCEPTION_PROLOG(n, intnum, addition) \ 322 EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n)) 323 324#define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \ 325 EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n)) 326 327/* Variants of the "addition" argument for the prolog 328 */ 329#define PROLOG_ADDITION_NONE_GEN(n) 330#define PROLOG_ADDITION_NONE_GDBELL(n) 331#define PROLOG_ADDITION_NONE_CRIT(n) 332#define PROLOG_ADDITION_NONE_DBG(n) 333#define PROLOG_ADDITION_NONE_MC(n) 334 335#define PROLOG_ADDITION_MASKABLE_GEN(n) \ 336 lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \ 337 andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \ 338 bne masked_interrupt_book3e_##n 339 340/* 341 * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is 342 * called, because that does SAVE_NVGPRS which must see the original register 343 * values, otherwise the scratch values might be restored when exiting the 344 * interrupt. 345 */ 346#define PROLOG_ADDITION_2REGS_GEN(n) \ 347 std r14,PACA_EXGEN+EX_R14(r13); \ 348 std r15,PACA_EXGEN+EX_R15(r13) 349 350#define PROLOG_ADDITION_1REG_GEN(n) \ 351 std r14,PACA_EXGEN+EX_R14(r13); 352 353#define PROLOG_ADDITION_2REGS_CRIT(n) \ 354 std r14,PACA_EXCRIT+EX_R14(r13); \ 355 std r15,PACA_EXCRIT+EX_R15(r13) 356 357#define PROLOG_ADDITION_2REGS_DBG(n) \ 358 std r14,PACA_EXDBG+EX_R14(r13); \ 359 std r15,PACA_EXDBG+EX_R15(r13) 360 361#define PROLOG_ADDITION_2REGS_MC(n) \ 362 std r14,PACA_EXMC+EX_R14(r13); \ 363 std r15,PACA_EXMC+EX_R15(r13) 364 365/* Core exception code for all exceptions except TLB misses. */ 366#define EXCEPTION_COMMON_LVL(n, scratch, excf) \ 367exc_##n##_common: \ 368 SAVE_GPR(0, r1); /* save r0 in stackframe */ \ 369 SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ 370 std r10,_NIP(r1); /* save SRR0 to stackframe */ \ 371 std r11,_MSR(r1); /* save SRR1 to stackframe */ \ 372 beq 2f; /* if from kernel mode */ \ 3732: ld r3,excf+EX_R10(r13); /* get back r10 */ \ 374 ld r4,excf+EX_R11(r13); /* get back r11 */ \ 375 mfspr r5,scratch; /* get back r13 */ \ 376 SAVE_GPR(12, r1); /* save r12 in stackframe */ \ 377 LOAD_PACA_TOC(); /* get kernel TOC into r2 */ \ 378 mflr r6; /* save LR in stackframe */ \ 379 mfctr r7; /* save CTR in stackframe */ \ 380 mfspr r8,SPRN_XER; /* save XER in stackframe */ \ 381 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \ 382 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \ 383 lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \ 384 LOAD_REG_IMMEDIATE(r12, STACK_FRAME_REGS_MARKER); \ 385 ZEROIZE_GPR(0); \ 386 std r3,GPR10(r1); /* save r10 to stackframe */ \ 387 std r4,GPR11(r1); /* save r11 to stackframe */ \ 388 std r5,GPR13(r1); /* save it to stackframe */ \ 389 std r6,_LINK(r1); \ 390 std r7,_CTR(r1); \ 391 std r8,_XER(r1); \ 392 li r3,(n); /* regs.trap vector */ \ 393 std r9,0(r1); /* store stack frame back link */ \ 394 std r10,_CCR(r1); /* store orig CR in stackframe */ \ 395 std r9,GPR1(r1); /* store stack frame back link */ \ 396 std r11,SOFTE(r1); /* and save it to stackframe */ \ 397 std r12,STACK_INT_FRAME_MARKER(r1); /* mark the frame */ \ 398 std r3,_TRAP(r1); /* set trap number */ \ 399 std r0,RESULT(r1); /* clear regs->result */ \ 400 SAVE_NVGPRS(r1); \ 401 SANITIZE_NVGPRS(); /* minimise speculation influence */ 402 403#define EXCEPTION_COMMON(n) \ 404 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN) 405#define EXCEPTION_COMMON_CRIT(n) \ 406 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT) 407#define EXCEPTION_COMMON_MC(n) \ 408 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC) 409#define EXCEPTION_COMMON_DBG(n) \ 410 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG) 411 412/* XXX FIXME: Restore r14/r15 when necessary */ 413#define BAD_STACK_TRAMPOLINE(n) \ 414exc_##n##_bad_stack: \ 415 li r1,(n); /* get exception number */ \ 416 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \ 417 b bad_stack_book3e; /* bad stack error */ 418 419/* WARNING: If you change the layout of this stub, make sure you check 420 * the debug exception handler which handles single stepping 421 * into exceptions from userspace, and the MM code in 422 * arch/powerpc/mm/tlb_nohash.c which patches the branch here 423 * and would need to be updated if that branch is moved 424 */ 425#define EXCEPTION_STUB(loc, label) \ 426 . = interrupt_base_book3e + loc; \ 427 nop; /* To make debug interrupts happy */ \ 428 b exc_##label##_book3e; 429 430#define ACK_NONE(r) 431#define ACK_DEC(r) \ 432 lis r,TSR_DIS@h; \ 433 mtspr SPRN_TSR,r 434#define ACK_FIT(r) \ 435 lis r,TSR_FIS@h; \ 436 mtspr SPRN_TSR,r 437 438/* Used by asynchronous interrupt that may happen in the idle loop. 439 * 440 * This check if the thread was in the idle loop, and if yes, returns 441 * to the caller rather than the PC. This is to avoid a race if 442 * interrupts happen before the wait instruction. 443 */ 444#define CHECK_NAPPING() \ 445 ld r11, PACA_THREAD_INFO(r13); \ 446 ld r10,TI_LOCAL_FLAGS(r11); \ 447 andi. r9,r10,_TLF_NAPPING; \ 448 beq+ 1f; \ 449 ld r8,_LINK(r1); \ 450 rlwinm r7,r10,0,~_TLF_NAPPING; \ 451 std r8,_NIP(r1); \ 452 std r7,TI_LOCAL_FLAGS(r11); \ 4531: 454 455 456#define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \ 457 START_EXCEPTION(label); \ 458 NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\ 459 EXCEPTION_COMMON(trapnum) \ 460 ack(r8); \ 461 CHECK_NAPPING(); \ 462 addi r3,r1,STACK_INT_FRAME_REGS; \ 463 bl hdlr; \ 464 b interrupt_return 465 466/* 467 * And here we have the exception vectors ! 468 */ 469 470 .text 471 .balign 0x1000 472 .globl interrupt_base_book3e 473interrupt_base_book3e: /* fake trap */ 474 EXCEPTION_STUB(0x000, machine_check) 475 EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */ 476 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */ 477 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */ 478 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */ 479 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */ 480 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */ 481 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */ 482 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */ 483 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */ 484 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */ 485 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */ 486 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */ 487 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */ 488 EXCEPTION_STUB(0x1c0, data_tlb_miss_bolted) 489 EXCEPTION_STUB(0x1e0, instruction_tlb_miss_bolted) 490 EXCEPTION_STUB(0x200, altivec_unavailable) 491 EXCEPTION_STUB(0x220, altivec_assist) 492 EXCEPTION_STUB(0x260, perfmon) 493 EXCEPTION_STUB(0x280, doorbell) 494 EXCEPTION_STUB(0x2a0, doorbell_crit) 495 EXCEPTION_STUB(0x2c0, guest_doorbell) 496 EXCEPTION_STUB(0x2e0, guest_doorbell_crit) 497 EXCEPTION_STUB(0x300, hypercall) 498 EXCEPTION_STUB(0x320, ehpriv) 499 EXCEPTION_STUB(0x340, lrat_error) 500 501 .globl __end_interrupts 502__end_interrupts: 503 504/* Critical Input Interrupt */ 505 START_EXCEPTION(critical_input); 506 CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL, 507 PROLOG_ADDITION_NONE) 508 EXCEPTION_COMMON_CRIT(0x100) 509 bl special_reg_save 510 CHECK_NAPPING(); 511 addi r3,r1,STACK_INT_FRAME_REGS 512 bl unknown_nmi_exception 513 b ret_from_crit_except 514 515/* Machine Check Interrupt */ 516 START_EXCEPTION(machine_check); 517 MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK, 518 PROLOG_ADDITION_NONE) 519 EXCEPTION_COMMON_MC(0x000) 520 bl special_reg_save 521 CHECK_NAPPING(); 522 addi r3,r1,STACK_INT_FRAME_REGS 523 bl machine_check_exception 524 b ret_from_mc_except 525 526/* Data Storage Interrupt */ 527 START_EXCEPTION(data_storage) 528 NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE, 529 PROLOG_ADDITION_2REGS) 530 mfspr r14,SPRN_DEAR 531 mfspr r15,SPRN_ESR 532 std r14,_DEAR(r1) 533 std r15,_ESR(r1) 534 ld r14,PACA_EXGEN+EX_R14(r13) 535 ld r15,PACA_EXGEN+EX_R15(r13) 536 EXCEPTION_COMMON(0x300) 537 b storage_fault_common 538 539/* Instruction Storage Interrupt */ 540 START_EXCEPTION(instruction_storage); 541 NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE, 542 PROLOG_ADDITION_2REGS) 543 li r15,0 544 mr r14,r10 545 std r14,_DEAR(r1) 546 std r15,_ESR(r1) 547 ld r14,PACA_EXGEN+EX_R14(r13) 548 ld r15,PACA_EXGEN+EX_R15(r13) 549 EXCEPTION_COMMON(0x400) 550 b storage_fault_common 551 552/* External Input Interrupt */ 553 MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL, 554 external_input, do_IRQ, ACK_NONE) 555 556/* Alignment */ 557 START_EXCEPTION(alignment); 558 NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT, 559 PROLOG_ADDITION_2REGS) 560 mfspr r14,SPRN_DEAR 561 mfspr r15,SPRN_ESR 562 std r14,_DEAR(r1) 563 std r15,_ESR(r1) 564 ld r14,PACA_EXGEN+EX_R14(r13) 565 ld r15,PACA_EXGEN+EX_R15(r13) 566 EXCEPTION_COMMON(0x600) 567 b alignment_more /* no room, go out of line */ 568 569/* Program Interrupt */ 570 START_EXCEPTION(program); 571 NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM, 572 PROLOG_ADDITION_1REG) 573 mfspr r14,SPRN_ESR 574 std r14,_ESR(r1) 575 ld r14,PACA_EXGEN+EX_R14(r13) 576 EXCEPTION_COMMON(0x700) 577 addi r3,r1,STACK_INT_FRAME_REGS 578 bl program_check_exception 579 REST_NVGPRS(r1) 580 b interrupt_return 581 582/* Floating Point Unavailable Interrupt */ 583 START_EXCEPTION(fp_unavailable); 584 NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL, 585 PROLOG_ADDITION_NONE) 586 /* we can probably do a shorter exception entry for that one... */ 587 EXCEPTION_COMMON(0x800) 588 ld r12,_MSR(r1) 589 andi. r0,r12,MSR_PR; 590 beq- 1f 591 bl load_up_fpu 592 b fast_interrupt_return 5931: addi r3,r1,STACK_INT_FRAME_REGS 594 bl kernel_fp_unavailable_exception 595 b interrupt_return 596 597/* Altivec Unavailable Interrupt */ 598 START_EXCEPTION(altivec_unavailable); 599 NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL, 600 PROLOG_ADDITION_NONE) 601 /* we can probably do a shorter exception entry for that one... */ 602 EXCEPTION_COMMON(0x200) 603#ifdef CONFIG_ALTIVEC 604BEGIN_FTR_SECTION 605 ld r12,_MSR(r1) 606 andi. r0,r12,MSR_PR; 607 beq- 1f 608 bl load_up_altivec 609 b fast_interrupt_return 6101: 611END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 612#endif 613 addi r3,r1,STACK_INT_FRAME_REGS 614 bl altivec_unavailable_exception 615 b interrupt_return 616 617/* AltiVec Assist */ 618 START_EXCEPTION(altivec_assist); 619 NORMAL_EXCEPTION_PROLOG(0x220, 620 BOOKE_INTERRUPT_ALTIVEC_ASSIST, 621 PROLOG_ADDITION_NONE) 622 EXCEPTION_COMMON(0x220) 623 addi r3,r1,STACK_INT_FRAME_REGS 624#ifdef CONFIG_ALTIVEC 625BEGIN_FTR_SECTION 626 bl altivec_assist_exception 627END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 628 REST_NVGPRS(r1) 629#else 630 bl unknown_exception 631#endif 632 b interrupt_return 633 634 635/* Decrementer Interrupt */ 636 MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER, 637 decrementer, timer_interrupt, ACK_DEC) 638 639/* Fixed Interval Timer Interrupt */ 640 MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT, 641 fixed_interval, unknown_exception, ACK_FIT) 642 643/* Watchdog Timer Interrupt */ 644 START_EXCEPTION(watchdog); 645 CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG, 646 PROLOG_ADDITION_NONE) 647 EXCEPTION_COMMON_CRIT(0x9f0) 648 bl special_reg_save 649 CHECK_NAPPING(); 650 addi r3,r1,STACK_INT_FRAME_REGS 651#ifdef CONFIG_BOOKE_WDT 652 bl WatchdogException 653#else 654 bl unknown_nmi_exception 655#endif 656 b ret_from_crit_except 657 658/* System Call Interrupt */ 659 START_EXCEPTION(system_call) 660 mr r9,r13 /* keep a copy of userland r13 */ 661 mfspr r11,SPRN_SRR0 /* get return address */ 662 mfspr r12,SPRN_SRR1 /* get previous MSR */ 663 mfspr r13,SPRN_SPRG_PACA /* get our PACA */ 664 b system_call_common 665 666/* Auxiliary Processor Unavailable Interrupt */ 667 START_EXCEPTION(ap_unavailable); 668 NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL, 669 PROLOG_ADDITION_NONE) 670 EXCEPTION_COMMON(0xf20) 671 addi r3,r1,STACK_INT_FRAME_REGS 672 bl unknown_exception 673 b interrupt_return 674 675/* Debug exception as a critical interrupt*/ 676 START_EXCEPTION(debug_crit); 677 CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, 678 PROLOG_ADDITION_2REGS) 679 680 /* 681 * If there is a single step or branch-taken exception in an 682 * exception entry sequence, it was probably meant to apply to 683 * the code where the exception occurred (since exception entry 684 * doesn't turn off DE automatically). We simulate the effect 685 * of turning off DE on entry to an exception handler by turning 686 * off DE in the CSRR1 value and clearing the debug status. 687 */ 688 689 mfspr r14,SPRN_DBSR /* check single-step/branch taken */ 690 andis. r15,r14,(DBSR_IC|DBSR_BT)@h 691 beq+ 1f 692 693#ifdef CONFIG_RELOCATABLE 694 __LOAD_PACA_TOC(r15) 695 LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e) 696 LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts) 697 cmpld cr0,r10,r14 698 cmpld cr1,r10,r15 699#else 700 LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e) 701 cmpld cr0, r10, r14 702 LOAD_REG_IMMEDIATE_SYM(r14, r15, __end_interrupts) 703 cmpld cr1, r10, r14 704#endif 705 blt+ cr0,1f 706 bge+ cr1,1f 707 708 /* here it looks like we got an inappropriate debug exception. */ 709 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ 710 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */ 711 mtspr SPRN_DBSR,r14 712 mtspr SPRN_CSRR1,r11 713 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */ 714 ld r1,PACA_EXCRIT+EX_R1(r13) 715 ld r14,PACA_EXCRIT+EX_R14(r13) 716 ld r15,PACA_EXCRIT+EX_R15(r13) 717 mtcr r10 718 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */ 719 ld r11,PACA_EXCRIT+EX_R11(r13) 720 mfspr r13,SPRN_SPRG_CRIT_SCRATCH 721 rfci 722 723 /* Normal debug exception */ 724 /* XXX We only handle coming from userspace for now since we can't 725 * quite save properly an interrupted kernel state yet 726 */ 7271: andi. r14,r11,MSR_PR; /* check for userspace again */ 728 beq kernel_dbg_exc; /* if from kernel mode */ 729 730 /* Now we mash up things to make it look like we are coming on a 731 * normal exception 732 */ 733 mfspr r14,SPRN_DBSR 734 std r14,_DSISR(r1) 735 ld r14,PACA_EXCRIT+EX_R14(r13) 736 ld r15,PACA_EXCRIT+EX_R15(r13) 737 EXCEPTION_COMMON_CRIT(0xd00) 738 addi r3,r1,STACK_INT_FRAME_REGS 739 bl DebugException 740 REST_NVGPRS(r1) 741 b interrupt_return 742 743kernel_dbg_exc: 744 b . /* NYI */ 745 746/* Debug exception as a debug interrupt*/ 747 START_EXCEPTION(debug_debug); 748 DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, 749 PROLOG_ADDITION_2REGS) 750 751 /* 752 * If there is a single step or branch-taken exception in an 753 * exception entry sequence, it was probably meant to apply to 754 * the code where the exception occurred (since exception entry 755 * doesn't turn off DE automatically). We simulate the effect 756 * of turning off DE on entry to an exception handler by turning 757 * off DE in the DSRR1 value and clearing the debug status. 758 */ 759 760 mfspr r14,SPRN_DBSR /* check single-step/branch taken */ 761 andis. r15,r14,(DBSR_IC|DBSR_BT)@h 762 beq+ 1f 763 764#ifdef CONFIG_RELOCATABLE 765 __LOAD_PACA_TOC(r15) 766 LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e) 767 LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts) 768 cmpld cr0,r10,r14 769 cmpld cr1,r10,r15 770#else 771 LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e) 772 cmpld cr0, r10, r14 773 LOAD_REG_IMMEDIATE_SYM(r14, r15,__end_interrupts) 774 cmpld cr1, r10, r14 775#endif 776 blt+ cr0,1f 777 bge+ cr1,1f 778 779 /* here it looks like we got an inappropriate debug exception. */ 780 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ 781 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */ 782 mtspr SPRN_DBSR,r14 783 mtspr SPRN_DSRR1,r11 784 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */ 785 ld r1,PACA_EXDBG+EX_R1(r13) 786 ld r14,PACA_EXDBG+EX_R14(r13) 787 ld r15,PACA_EXDBG+EX_R15(r13) 788 mtcr r10 789 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */ 790 ld r11,PACA_EXDBG+EX_R11(r13) 791 mfspr r13,SPRN_SPRG_DBG_SCRATCH 792 rfdi 793 794 /* Normal debug exception */ 795 /* XXX We only handle coming from userspace for now since we can't 796 * quite save properly an interrupted kernel state yet 797 */ 7981: andi. r14,r11,MSR_PR; /* check for userspace again */ 799 beq kernel_dbg_exc; /* if from kernel mode */ 800 801 /* Now we mash up things to make it look like we are coming on a 802 * normal exception 803 */ 804 mfspr r14,SPRN_DBSR 805 std r14,_DSISR(r1) 806 ld r14,PACA_EXDBG+EX_R14(r13) 807 ld r15,PACA_EXDBG+EX_R15(r13) 808 EXCEPTION_COMMON_DBG(0xd08) 809 addi r3,r1,STACK_INT_FRAME_REGS 810 bl DebugException 811 REST_NVGPRS(r1) 812 b interrupt_return 813 814 START_EXCEPTION(perfmon); 815 NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR, 816 PROLOG_ADDITION_NONE) 817 EXCEPTION_COMMON(0x260) 818 CHECK_NAPPING() 819 addi r3,r1,STACK_INT_FRAME_REGS 820 /* 821 * XXX: Returning from performance_monitor_exception taken as a 822 * soft-NMI (Linux irqs disabled) may be risky to use interrupt_return 823 * and could cause bugs in return or elsewhere. That case should just 824 * restore registers and return. There is a workaround for one known 825 * problem in interrupt_exit_kernel_prepare(). 826 */ 827 bl performance_monitor_exception 828 b interrupt_return 829 830/* Doorbell interrupt */ 831 MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL, 832 doorbell, doorbell_exception, ACK_NONE) 833 834/* Doorbell critical Interrupt */ 835 START_EXCEPTION(doorbell_crit); 836 CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL, 837 PROLOG_ADDITION_NONE) 838 EXCEPTION_COMMON_CRIT(0x2a0) 839 bl special_reg_save 840 CHECK_NAPPING(); 841 addi r3,r1,STACK_INT_FRAME_REGS 842 bl unknown_nmi_exception 843 b ret_from_crit_except 844 845/* 846 * Guest doorbell interrupt 847 * This general exception use GSRRx save/restore registers 848 */ 849 START_EXCEPTION(guest_doorbell); 850 GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL, 851 PROLOG_ADDITION_NONE) 852 EXCEPTION_COMMON(0x2c0) 853 addi r3,r1,STACK_INT_FRAME_REGS 854 bl unknown_exception 855 b interrupt_return 856 857/* Guest Doorbell critical Interrupt */ 858 START_EXCEPTION(guest_doorbell_crit); 859 CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT, 860 PROLOG_ADDITION_NONE) 861 EXCEPTION_COMMON_CRIT(0x2e0) 862 bl special_reg_save 863 CHECK_NAPPING(); 864 addi r3,r1,STACK_INT_FRAME_REGS 865 bl unknown_nmi_exception 866 b ret_from_crit_except 867 868/* Hypervisor call */ 869 START_EXCEPTION(hypercall); 870 NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL, 871 PROLOG_ADDITION_NONE) 872 EXCEPTION_COMMON(0x310) 873 addi r3,r1,STACK_INT_FRAME_REGS 874 bl unknown_exception 875 b interrupt_return 876 877/* Embedded Hypervisor priviledged */ 878 START_EXCEPTION(ehpriv); 879 NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV, 880 PROLOG_ADDITION_NONE) 881 EXCEPTION_COMMON(0x320) 882 addi r3,r1,STACK_INT_FRAME_REGS 883 bl unknown_exception 884 b interrupt_return 885 886/* LRAT Error interrupt */ 887 START_EXCEPTION(lrat_error); 888 NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR, 889 PROLOG_ADDITION_NONE) 890 EXCEPTION_COMMON(0x340) 891 addi r3,r1,STACK_INT_FRAME_REGS 892 bl unknown_exception 893 b interrupt_return 894 895.macro SEARCH_RESTART_TABLE 896#ifdef CONFIG_RELOCATABLE 897 __LOAD_PACA_TOC(r11) 898 LOAD_REG_ADDR_ALTTOC(r14, r11, __start___restart_table) 899 LOAD_REG_ADDR_ALTTOC(r15, r11, __stop___restart_table) 900#else 901 LOAD_REG_IMMEDIATE_SYM(r14, r11, __start___restart_table) 902 LOAD_REG_IMMEDIATE_SYM(r15, r11, __stop___restart_table) 903#endif 904300: 905 cmpd r14,r15 906 beq 302f 907 ld r11,0(r14) 908 cmpld r10,r11 909 blt 301f 910 ld r11,8(r14) 911 cmpld r10,r11 912 bge 301f 913 ld r11,16(r14) 914 b 303f 915301: 916 addi r14,r14,24 917 b 300b 918302: 919 li r11,0 920303: 921.endm 922 923/* 924 * An interrupt came in while soft-disabled; We mark paca->irq_happened 925 * accordingly and if the interrupt is level sensitive, we hard disable 926 * hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so 927 * keep these in synch. 928 */ 929 930.macro masked_interrupt_book3e paca_irq full_mask 931 std r14,PACA_EXGEN+EX_R14(r13) 932 std r15,PACA_EXGEN+EX_R15(r13) 933 934 lbz r10,PACAIRQHAPPENED(r13) 935 .if \full_mask == 1 936 ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS 937 .else 938 ori r10,r10,\paca_irq 939 .endif 940 stb r10,PACAIRQHAPPENED(r13) 941 942 .if \full_mask == 1 943 xori r11,r11,MSR_EE /* clear MSR_EE */ 944 mtspr SPRN_SRR1,r11 945 .endif 946 947 mfspr r10,SPRN_SRR0 948 SEARCH_RESTART_TABLE 949 cmpdi r11,0 950 beq 1f 951 mtspr SPRN_SRR0,r11 /* return to restart address */ 9521: 953 954 lwz r11,PACA_EXGEN+EX_CR(r13) 955 mtcr r11 956 ld r10,PACA_EXGEN+EX_R10(r13) 957 ld r11,PACA_EXGEN+EX_R11(r13) 958 ld r14,PACA_EXGEN+EX_R14(r13) 959 ld r15,PACA_EXGEN+EX_R15(r13) 960 mfspr r13,SPRN_SPRG_GEN_SCRATCH 961 rfi 962 b . 963.endm 964 965masked_interrupt_book3e_0x500: 966 masked_interrupt_book3e PACA_IRQ_EE 1 967 968masked_interrupt_book3e_0x900: 969 ACK_DEC(r10); 970 masked_interrupt_book3e PACA_IRQ_DEC 0 971 972masked_interrupt_book3e_0x980: 973 ACK_FIT(r10); 974 masked_interrupt_book3e PACA_IRQ_DEC 0 975 976masked_interrupt_book3e_0x280: 977masked_interrupt_book3e_0x2c0: 978 masked_interrupt_book3e PACA_IRQ_DBELL 0 979 980/* 981 * This is called from 0x300 and 0x400 handlers after the prologs with 982 * r14 and r15 containing the fault address and error code, with the 983 * original values stashed away in the PACA 984 */ 985SYM_CODE_START_LOCAL(storage_fault_common) 986 addi r3,r1,STACK_INT_FRAME_REGS 987 bl do_page_fault 988 b interrupt_return 989SYM_CODE_END(storage_fault_common) 990 991/* 992 * Alignment exception doesn't fit entirely in the 0x100 bytes so it 993 * continues here. 994 */ 995SYM_CODE_START_LOCAL(alignment_more) 996 addi r3,r1,STACK_INT_FRAME_REGS 997 bl alignment_exception 998 REST_NVGPRS(r1) 999 b interrupt_return 1000SYM_CODE_END(alignment_more) 1001 1002/* 1003 * Trampolines used when spotting a bad kernel stack pointer in 1004 * the exception entry code. 1005 * 1006 * TODO: move some bits like SRR0 read to trampoline, pass PACA 1007 * index around, etc... to handle crit & mcheck 1008 */ 1009BAD_STACK_TRAMPOLINE(0x000) 1010BAD_STACK_TRAMPOLINE(0x100) 1011BAD_STACK_TRAMPOLINE(0x200) 1012BAD_STACK_TRAMPOLINE(0x220) 1013BAD_STACK_TRAMPOLINE(0x260) 1014BAD_STACK_TRAMPOLINE(0x280) 1015BAD_STACK_TRAMPOLINE(0x2a0) 1016BAD_STACK_TRAMPOLINE(0x2c0) 1017BAD_STACK_TRAMPOLINE(0x2e0) 1018BAD_STACK_TRAMPOLINE(0x300) 1019BAD_STACK_TRAMPOLINE(0x310) 1020BAD_STACK_TRAMPOLINE(0x320) 1021BAD_STACK_TRAMPOLINE(0x340) 1022BAD_STACK_TRAMPOLINE(0x400) 1023BAD_STACK_TRAMPOLINE(0x500) 1024BAD_STACK_TRAMPOLINE(0x600) 1025BAD_STACK_TRAMPOLINE(0x700) 1026BAD_STACK_TRAMPOLINE(0x800) 1027BAD_STACK_TRAMPOLINE(0x900) 1028BAD_STACK_TRAMPOLINE(0x980) 1029BAD_STACK_TRAMPOLINE(0x9f0) 1030BAD_STACK_TRAMPOLINE(0xa00) 1031BAD_STACK_TRAMPOLINE(0xb00) 1032BAD_STACK_TRAMPOLINE(0xc00) 1033BAD_STACK_TRAMPOLINE(0xd00) 1034BAD_STACK_TRAMPOLINE(0xd08) 1035BAD_STACK_TRAMPOLINE(0xe00) 1036BAD_STACK_TRAMPOLINE(0xf00) 1037BAD_STACK_TRAMPOLINE(0xf20) 1038 1039_GLOBAL(bad_stack_book3e) 1040 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */ 1041 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */ 1042 ld r1,PACAEMERGSP(r13) 1043 subi r1,r1,64+INT_FRAME_SIZE 1044 std r10,_NIP(r1) 1045 std r11,_MSR(r1) 1046 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */ 1047 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */ 1048 std r10,GPR1(r1) 1049 std r11,_CCR(r1) 1050 mfspr r10,SPRN_DEAR 1051 mfspr r11,SPRN_ESR 1052 std r10,_DEAR(r1) 1053 std r11,_ESR(r1) 1054 SAVE_GPR(0, r1); /* save r0 in stackframe */ \ 1055 SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ 1056 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \ 1057 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \ 1058 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \ 1059 std r3,GPR10(r1); /* save r10 to stackframe */ \ 1060 std r4,GPR11(r1); /* save r11 to stackframe */ \ 1061 SAVE_GPR(12, r1); /* save r12 in stackframe */ \ 1062 std r5,GPR13(r1); /* save it to stackframe */ \ 1063 mflr r10 1064 mfctr r11 1065 mfxer r12 1066 std r10,_LINK(r1) 1067 std r11,_CTR(r1) 1068 std r12,_XER(r1) 1069 SAVE_NVGPRS(r1) 1070 lhz r12,PACA_TRAP_SAVE(r13) 1071 std r12,_TRAP(r1) 1072 addi r11,r1,INT_FRAME_SIZE 1073 std r11,0(r1) 1074 ZEROIZE_GPR(12) 1075 std r12,0(r11) 1076 LOAD_PACA_TOC() 10771: addi r3,r1,STACK_INT_FRAME_REGS 1078 bl kernel_bad_stack 1079 b 1b 1080 1081/* 1082 * Setup the initial TLB for a core. This current implementation 1083 * assume that whatever we are running off will not conflict with 1084 * the new mapping at PAGE_OFFSET. 1085 */ 1086_GLOBAL(initial_tlb_book3e) 1087 1088 /* Look for the first TLB with IPROT set */ 1089 mfspr r4,SPRN_TLB0CFG 1090 andi. r3,r4,TLBnCFG_IPROT 1091 lis r3,MAS0_TLBSEL(0)@h 1092 bne found_iprot 1093 1094 mfspr r4,SPRN_TLB1CFG 1095 andi. r3,r4,TLBnCFG_IPROT 1096 lis r3,MAS0_TLBSEL(1)@h 1097 bne found_iprot 1098 1099 mfspr r4,SPRN_TLB2CFG 1100 andi. r3,r4,TLBnCFG_IPROT 1101 lis r3,MAS0_TLBSEL(2)@h 1102 bne found_iprot 1103 1104 lis r3,MAS0_TLBSEL(3)@h 1105 mfspr r4,SPRN_TLB3CFG 1106 /* fall through */ 1107 1108found_iprot: 1109 andi. r5,r4,TLBnCFG_HES 1110 bne have_hes 1111 1112 mflr r8 /* save LR */ 1113/* 1. Find the index of the entry we're executing in 1114 * 1115 * r3 = MAS0_TLBSEL (for the iprot array) 1116 * r4 = SPRN_TLBnCFG 1117 */ 1118 bcl 20,31,$+4 /* Find our address */ 1119invstr: mflr r6 /* Make it accessible */ 1120 mfmsr r7 1121 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */ 1122 mfspr r7,SPRN_PID 1123 slwi r7,r7,16 1124 or r7,r7,r5 1125 mtspr SPRN_MAS6,r7 1126 tlbsx 0,r6 /* search MSR[IS], SPID=PID */ 1127 1128 mfspr r3,SPRN_MAS0 1129 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */ 1130 1131 mfspr r7,SPRN_MAS1 /* Insure IPROT set */ 1132 oris r7,r7,MAS1_IPROT@h 1133 mtspr SPRN_MAS1,r7 1134 tlbwe 1135 1136/* 2. Invalidate all entries except the entry we're executing in 1137 * 1138 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1139 * r4 = SPRN_TLBnCFG 1140 * r5 = ESEL of entry we are running in 1141 */ 1142 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */ 1143 li r6,0 /* Set Entry counter to 0 */ 11441: mr r7,r3 /* Set MAS0(TLBSEL) */ 1145 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ 1146 mtspr SPRN_MAS0,r7 1147 tlbre 1148 mfspr r7,SPRN_MAS1 1149 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ 1150 cmpw r5,r6 1151 beq skpinv /* Dont update the current execution TLB */ 1152 mtspr SPRN_MAS1,r7 1153 tlbwe 1154 isync 1155skpinv: addi r6,r6,1 /* Increment */ 1156 cmpw r6,r4 /* Are we done? */ 1157 bne 1b /* If not, repeat */ 1158 1159 /* Invalidate all TLBs */ 1160 PPC_TLBILX_ALL(0,R0) 1161 sync 1162 isync 1163 1164/* 3. Setup a temp mapping and jump to it 1165 * 1166 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1167 * r5 = ESEL of entry we are running in 1168 */ 1169 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */ 1170 addi r7,r7,0x1 1171 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */ 1172 mtspr SPRN_MAS0,r4 1173 tlbre 1174 1175 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */ 1176 mtspr SPRN_MAS0,r4 1177 1178 mfspr r7,SPRN_MAS1 1179 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */ 1180 mtspr SPRN_MAS1,r6 1181 1182 tlbwe 1183 1184 mfmsr r6 1185 xori r6,r6,MSR_IS 1186 mtspr SPRN_SRR1,r6 1187 bcl 20,31,$+4 /* Find our address */ 11881: mflr r6 1189 addi r6,r6,(2f - 1b) 1190 mtspr SPRN_SRR0,r6 1191 rfi 11922: 1193 1194/* 4. Clear out PIDs & Search info 1195 * 1196 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1197 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1198 * r5 = MAS3 1199 */ 1200 li r6,0 1201 mtspr SPRN_MAS6,r6 1202 mtspr SPRN_PID,r6 1203 1204/* 5. Invalidate mapping we started in 1205 * 1206 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1207 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1208 * r5 = MAS3 1209 */ 1210 mtspr SPRN_MAS0,r3 1211 tlbre 1212 mfspr r6,SPRN_MAS1 1213 rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */ 1214 mtspr SPRN_MAS1,r6 1215 tlbwe 1216 sync 1217 isync 1218 1219/* 6. Setup KERNELBASE mapping in TLB[0] 1220 * 1221 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1222 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1223 * r5 = MAS3 1224 */ 1225 rlwinm r3,r3,0,16,3 /* clear ESEL */ 1226 mtspr SPRN_MAS0,r3 1227 lis r6,(MAS1_VALID|MAS1_IPROT)@h 1228 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l 1229 mtspr SPRN_MAS1,r6 1230 1231 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | MAS2_M_IF_NEEDED) 1232 mtspr SPRN_MAS2,r6 1233 1234 rlwinm r5,r5,0,0,25 1235 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX 1236 mtspr SPRN_MAS3,r5 1237 li r5,-1 1238 rlwinm r5,r5,0,0,25 1239 1240 tlbwe 1241 1242/* 7. Jump to KERNELBASE mapping 1243 * 1244 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1245 */ 1246 /* Now we branch the new virtual address mapped by this entry */ 1247 bcl 20,31,$+4 /* Find our address */ 12481: mflr r6 1249 addi r6,r6,(2f - 1b) 1250 tovirt(r6,r6) 1251 lis r7,MSR_KERNEL@h 1252 ori r7,r7,MSR_KERNEL@l 1253 mtspr SPRN_SRR0,r6 1254 mtspr SPRN_SRR1,r7 1255 rfi /* start execution out of TLB1[0] entry */ 12562: 1257 1258/* 8. Clear out the temp mapping 1259 * 1260 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1261 */ 1262 mtspr SPRN_MAS0,r4 1263 tlbre 1264 mfspr r5,SPRN_MAS1 1265 rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */ 1266 mtspr SPRN_MAS1,r5 1267 tlbwe 1268 sync 1269 isync 1270 1271 /* We translate LR and return */ 1272 tovirt(r8,r8) 1273 mtlr r8 1274 blr 1275 1276have_hes: 1277 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the 1278 * kernel linear mapping. We also set MAS8 once for all here though 1279 * that will have to be made dependent on whether we are running under 1280 * a hypervisor I suppose. 1281 */ 1282 1283 /* BEWARE, MAGIC 1284 * This code is called as an ordinary function on the boot CPU. But to 1285 * avoid duplication, this code is also used in SCOM bringup of 1286 * secondary CPUs. We read the code between the initial_tlb_code_start 1287 * and initial_tlb_code_end labels one instruction at a time and RAM it 1288 * into the new core via SCOM. That doesn't process branches, so there 1289 * must be none between those two labels. It also means if this code 1290 * ever takes any parameters, the SCOM code must also be updated to 1291 * provide them. 1292 */ 1293_GLOBAL(a2_tlbinit_code_start) 1294 1295 ori r11,r3,MAS0_WQ_ALLWAYS 1296 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */ 1297 mtspr SPRN_MAS0,r11 1298 lis r3,(MAS1_VALID | MAS1_IPROT)@h 1299 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT 1300 mtspr SPRN_MAS1,r3 1301 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M) 1302 mtspr SPRN_MAS2,r3 1303 li r3,MAS3_SR | MAS3_SW | MAS3_SX 1304 mtspr SPRN_MAS7_MAS3,r3 1305 li r3,0 1306 mtspr SPRN_MAS8,r3 1307 1308 /* Write the TLB entry */ 1309 tlbwe 1310 1311 .globl a2_tlbinit_after_linear_map 1312a2_tlbinit_after_linear_map: 1313 1314 /* Now we branch the new virtual address mapped by this entry */ 1315#ifdef CONFIG_RELOCATABLE 1316 __LOAD_PACA_TOC(r5) 1317 LOAD_REG_ADDR_ALTTOC(r3, r5, 1f) 1318#else 1319 LOAD_REG_IMMEDIATE_SYM(r3, r5, 1f) 1320#endif 1321 mtctr r3 1322 bctr 1323 13241: /* We are now running at PAGE_OFFSET, clean the TLB of everything 1325 * else (including IPROTed things left by firmware) 1326 * r4 = TLBnCFG 1327 * r3 = current address (more or less) 1328 */ 1329 1330 li r5,0 1331 mtspr SPRN_MAS6,r5 1332 tlbsx 0,r3 1333 1334 rlwinm r9,r4,0,TLBnCFG_N_ENTRY 1335 rlwinm r10,r4,8,0xff 1336 addi r10,r10,-1 /* Get inner loop mask */ 1337 1338 li r3,1 1339 1340 mfspr r5,SPRN_MAS1 1341 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT)) 1342 1343 mfspr r6,SPRN_MAS2 1344 rldicr r6,r6,0,51 /* Extract EPN */ 1345 1346 mfspr r7,SPRN_MAS0 1347 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */ 1348 1349 rlwinm r8,r7,16,0xfff /* Extract ESEL */ 1350 13512: add r4,r3,r8 1352 and r4,r4,r10 1353 1354 rlwimi r7,r4,16,MAS0_ESEL_MASK 1355 1356 mtspr SPRN_MAS0,r7 1357 mtspr SPRN_MAS1,r5 1358 mtspr SPRN_MAS2,r6 1359 tlbwe 1360 1361 addi r3,r3,1 1362 and. r4,r3,r10 1363 1364 bne 3f 1365 addis r6,r6,(1<<30)@h 13663: 1367 cmpw r3,r9 1368 blt 2b 1369 1370 .globl a2_tlbinit_after_iprot_flush 1371a2_tlbinit_after_iprot_flush: 1372 1373 PPC_TLBILX(0,0,R0) 1374 sync 1375 isync 1376 1377 .globl a2_tlbinit_code_end 1378a2_tlbinit_code_end: 1379 1380 /* We translate LR and return */ 1381 mflr r3 1382 tovirt(r3,r3) 1383 mtlr r3 1384 blr 1385 1386/* 1387 * Main entry (boot CPU, thread 0) 1388 * 1389 * We enter here from head_64.S, possibly after the prom_init trampoline 1390 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits 1391 * mode. Anything else is as it was left by the bootloader 1392 * 1393 * Initial requirements of this port: 1394 * 1395 * - Kernel loaded at 0 physical 1396 * - A good lump of memory mapped 0:0 by UTLB entry 0 1397 * - MSR:IS & MSR:DS set to 0 1398 * 1399 * Note that some of the above requirements will be relaxed in the future 1400 * as the kernel becomes smarter at dealing with different initial conditions 1401 * but for now you have to be careful 1402 */ 1403_GLOBAL(start_initialization_book3e) 1404 mflr r28 1405 1406 /* First, we need to setup some initial TLBs to map the kernel 1407 * text, data and bss at PAGE_OFFSET. We don't have a real mode 1408 * and always use AS 0, so we just set it up to match our link 1409 * address and never use 0 based addresses. 1410 */ 1411 bl initial_tlb_book3e 1412 1413 /* Init global core bits */ 1414 bl init_core_book3e 1415 1416 /* Init per-thread bits */ 1417 bl init_thread_book3e 1418 1419 /* Return to common init code */ 1420 tovirt(r28,r28) 1421 mtlr r28 1422 blr 1423 1424 1425/* 1426 * Secondary core/processor entry 1427 * 1428 * This is entered for thread 0 of a secondary core, all other threads 1429 * are expected to be stopped. It's similar to start_initialization_book3e 1430 * except that it's generally entered from the holding loop in head_64.S 1431 * after CPUs have been gathered by Open Firmware. 1432 * 1433 * We assume we are in 32 bits mode running with whatever TLB entry was 1434 * set for us by the firmware or POR engine. 1435 */ 1436_GLOBAL(book3e_secondary_core_init_tlb_set) 1437 li r4,1 1438 b generic_secondary_smp_init 1439 1440_GLOBAL(book3e_secondary_core_init) 1441 mflr r28 1442 1443 /* Do we need to setup initial TLB entry ? */ 1444 cmplwi r4,0 1445 bne 2f 1446 1447 /* Setup TLB for this core */ 1448 bl initial_tlb_book3e 1449 1450 /* We can return from the above running at a different 1451 * address, so recalculate r2 (TOC) 1452 */ 1453 bl relative_toc 1454 1455 /* Init global core bits */ 14562: bl init_core_book3e 1457 1458 /* Init per-thread bits */ 14593: bl init_thread_book3e 1460 1461 /* Return to common init code at proper virtual address. 1462 * 1463 * Due to various previous assumptions, we know we entered this 1464 * function at either the final PAGE_OFFSET mapping or using a 1465 * 1:1 mapping at 0, so we don't bother doing a complicated check 1466 * here, we just ensure the return address has the right top bits. 1467 * 1468 * Note that if we ever want to be smarter about where we can be 1469 * started from, we have to be careful that by the time we reach 1470 * the code below we may already be running at a different location 1471 * than the one we were called from since initial_tlb_book3e can 1472 * have moved us already. 1473 */ 1474 cmpdi cr0,r28,0 1475 blt 1f 1476 lis r3,PAGE_OFFSET@highest 1477 sldi r3,r3,32 1478 or r28,r28,r3 14791: mtlr r28 1480 blr 1481 1482_GLOBAL(book3e_secondary_thread_init) 1483 mflr r28 1484 b 3b 1485 1486_GLOBAL(init_core_book3e) 1487 /* Establish the interrupt vector base */ 1488 tovirt(r2,r2) 1489 LOAD_REG_ADDR(r3, interrupt_base_book3e) 1490 mtspr SPRN_IVPR,r3 1491 sync 1492 blr 1493 1494SYM_CODE_START_LOCAL(init_thread_book3e) 1495 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h 1496 mtspr SPRN_EPCR,r3 1497 1498 /* Make sure interrupts are off */ 1499 wrteei 0 1500 1501 /* disable all timers and clear out status */ 1502 li r3,0 1503 mtspr SPRN_TCR,r3 1504 mfspr r3,SPRN_TSR 1505 mtspr SPRN_TSR,r3 1506 1507 blr 1508SYM_CODE_END(init_thread_book3e) 1509 1510_GLOBAL(__setup_base_ivors) 1511 SET_IVOR(0, 0x020) /* Critical Input */ 1512 SET_IVOR(1, 0x000) /* Machine Check */ 1513 SET_IVOR(2, 0x060) /* Data Storage */ 1514 SET_IVOR(3, 0x080) /* Instruction Storage */ 1515 SET_IVOR(4, 0x0a0) /* External Input */ 1516 SET_IVOR(5, 0x0c0) /* Alignment */ 1517 SET_IVOR(6, 0x0e0) /* Program */ 1518 SET_IVOR(7, 0x100) /* FP Unavailable */ 1519 SET_IVOR(8, 0x120) /* System Call */ 1520 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */ 1521 SET_IVOR(10, 0x160) /* Decrementer */ 1522 SET_IVOR(11, 0x180) /* Fixed Interval Timer */ 1523 SET_IVOR(12, 0x1a0) /* Watchdog Timer */ 1524 SET_IVOR(13, 0x1c0) /* Data TLB Error */ 1525 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */ 1526 SET_IVOR(15, 0x040) /* Debug */ 1527 1528 sync 1529 1530 blr 1531 1532_GLOBAL(setup_altivec_ivors) 1533 SET_IVOR(32, 0x200) /* AltiVec Unavailable */ 1534 SET_IVOR(33, 0x220) /* AltiVec Assist */ 1535 blr 1536 1537_GLOBAL(setup_perfmon_ivor) 1538 SET_IVOR(35, 0x260) /* Performance Monitor */ 1539 blr 1540 1541_GLOBAL(setup_doorbell_ivors) 1542 SET_IVOR(36, 0x280) /* Processor Doorbell */ 1543 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */ 1544 blr 1545 1546_GLOBAL(setup_ehv_ivors) 1547 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */ 1548 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */ 1549 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */ 1550 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */ 1551 blr 1552 1553_GLOBAL(setup_lrat_ivor) 1554 SET_IVOR(42, 0x340) /* LRAT Error */ 1555 blr 1556