1/* 2 * Boot code and exception vectors for Book3E processors 3 * 4 * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#include <linux/threads.h> 13#include <asm/reg.h> 14#include <asm/page.h> 15#include <asm/ppc_asm.h> 16#include <asm/asm-offsets.h> 17#include <asm/cputable.h> 18#include <asm/setup.h> 19#include <asm/thread_info.h> 20#include <asm/reg_a2.h> 21#include <asm/exception-64e.h> 22#include <asm/bug.h> 23#include <asm/irqflags.h> 24#include <asm/ptrace.h> 25#include <asm/ppc-opcode.h> 26#include <asm/mmu.h> 27#include <asm/hw_irq.h> 28#include <asm/kvm_asm.h> 29#include <asm/kvm_booke_hv_asm.h> 30 31/* XXX This will ultimately add space for a special exception save 32 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc... 33 * when taking special interrupts. For now we don't support that, 34 * special interrupts from within a non-standard level will probably 35 * blow you up 36 */ 37#define SPECIAL_EXC_SRR0 0 38#define SPECIAL_EXC_SRR1 1 39#define SPECIAL_EXC_SPRG_GEN 2 40#define SPECIAL_EXC_SPRG_TLB 3 41#define SPECIAL_EXC_MAS0 4 42#define SPECIAL_EXC_MAS1 5 43#define SPECIAL_EXC_MAS2 6 44#define SPECIAL_EXC_MAS3 7 45#define SPECIAL_EXC_MAS6 8 46#define SPECIAL_EXC_MAS7 9 47#define SPECIAL_EXC_MAS5 10 /* E.HV only */ 48#define SPECIAL_EXC_MAS8 11 /* E.HV only */ 49#define SPECIAL_EXC_IRQHAPPENED 12 50#define SPECIAL_EXC_DEAR 13 51#define SPECIAL_EXC_ESR 14 52#define SPECIAL_EXC_SOFTE 15 53#define SPECIAL_EXC_CSRR0 16 54#define SPECIAL_EXC_CSRR1 17 55/* must be even to keep 16-byte stack alignment */ 56#define SPECIAL_EXC_END 18 57 58#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8) 59#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288) 60 61#define SPECIAL_EXC_STORE(reg, name) \ 62 std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) 63 64#define SPECIAL_EXC_LOAD(reg, name) \ 65 ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) 66 67special_reg_save: 68 lbz r9,PACAIRQHAPPENED(r13) 69 RECONCILE_IRQ_STATE(r3,r4) 70 71 /* 72 * We only need (or have stack space) to save this stuff if 73 * we interrupted the kernel. 74 */ 75 ld r3,_MSR(r1) 76 andi. r3,r3,MSR_PR 77 bnelr 78 79 /* Copy info into temporary exception thread info */ 80 ld r11,PACAKSAVE(r13) 81 CURRENT_THREAD_INFO(r11, r11) 82 CURRENT_THREAD_INFO(r12, r1) 83 ld r10,TI_FLAGS(r11) 84 std r10,TI_FLAGS(r12) 85 ld r10,TI_PREEMPT(r11) 86 std r10,TI_PREEMPT(r12) 87 ld r10,TI_TASK(r11) 88 std r10,TI_TASK(r12) 89 90 /* 91 * Advance to the next TLB exception frame for handler 92 * types that don't do it automatically. 93 */ 94 LOAD_REG_ADDR(r11,extlb_level_exc) 95 lwz r12,0(r11) 96 mfspr r10,SPRN_SPRG_TLB_EXFRAME 97 add r10,r10,r12 98 mtspr SPRN_SPRG_TLB_EXFRAME,r10 99 100 /* 101 * Save registers needed to allow nesting of certain exceptions 102 * (such as TLB misses) inside special exception levels 103 */ 104 mfspr r10,SPRN_SRR0 105 SPECIAL_EXC_STORE(r10,SRR0) 106 mfspr r10,SPRN_SRR1 107 SPECIAL_EXC_STORE(r10,SRR1) 108 mfspr r10,SPRN_SPRG_GEN_SCRATCH 109 SPECIAL_EXC_STORE(r10,SPRG_GEN) 110 mfspr r10,SPRN_SPRG_TLB_SCRATCH 111 SPECIAL_EXC_STORE(r10,SPRG_TLB) 112 mfspr r10,SPRN_MAS0 113 SPECIAL_EXC_STORE(r10,MAS0) 114 mfspr r10,SPRN_MAS1 115 SPECIAL_EXC_STORE(r10,MAS1) 116 mfspr r10,SPRN_MAS2 117 SPECIAL_EXC_STORE(r10,MAS2) 118 mfspr r10,SPRN_MAS3 119 SPECIAL_EXC_STORE(r10,MAS3) 120 mfspr r10,SPRN_MAS6 121 SPECIAL_EXC_STORE(r10,MAS6) 122 mfspr r10,SPRN_MAS7 123 SPECIAL_EXC_STORE(r10,MAS7) 124BEGIN_FTR_SECTION 125 mfspr r10,SPRN_MAS5 126 SPECIAL_EXC_STORE(r10,MAS5) 127 mfspr r10,SPRN_MAS8 128 SPECIAL_EXC_STORE(r10,MAS8) 129 130 /* MAS5/8 could have inappropriate values if we interrupted KVM code */ 131 li r10,0 132 mtspr SPRN_MAS5,r10 133 mtspr SPRN_MAS8,r10 134END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) 135 SPECIAL_EXC_STORE(r9,IRQHAPPENED) 136 137 mfspr r10,SPRN_DEAR 138 SPECIAL_EXC_STORE(r10,DEAR) 139 mfspr r10,SPRN_ESR 140 SPECIAL_EXC_STORE(r10,ESR) 141 142 lbz r10,PACASOFTIRQEN(r13) 143 SPECIAL_EXC_STORE(r10,SOFTE) 144 ld r10,_NIP(r1) 145 SPECIAL_EXC_STORE(r10,CSRR0) 146 ld r10,_MSR(r1) 147 SPECIAL_EXC_STORE(r10,CSRR1) 148 149 blr 150 151ret_from_level_except: 152 ld r3,_MSR(r1) 153 andi. r3,r3,MSR_PR 154 beq 1f 155 b ret_from_except 1561: 157 158 LOAD_REG_ADDR(r11,extlb_level_exc) 159 lwz r12,0(r11) 160 mfspr r10,SPRN_SPRG_TLB_EXFRAME 161 sub r10,r10,r12 162 mtspr SPRN_SPRG_TLB_EXFRAME,r10 163 164 /* 165 * It's possible that the special level exception interrupted a 166 * TLB miss handler, and inserted the same entry that the 167 * interrupted handler was about to insert. On CPUs without TLB 168 * write conditional, this can result in a duplicate TLB entry. 169 * Wipe all non-bolted entries to be safe. 170 * 171 * Note that this doesn't protect against any TLB misses 172 * we may take accessing the stack from here to the end of 173 * the special level exception. It's not clear how we can 174 * reasonably protect against that, but only CPUs with 175 * neither TLB write conditional nor bolted kernel memory 176 * are affected. Do any such CPUs even exist? 177 */ 178 PPC_TLBILX_ALL(0,R0) 179 180 REST_NVGPRS(r1) 181 182 SPECIAL_EXC_LOAD(r10,SRR0) 183 mtspr SPRN_SRR0,r10 184 SPECIAL_EXC_LOAD(r10,SRR1) 185 mtspr SPRN_SRR1,r10 186 SPECIAL_EXC_LOAD(r10,SPRG_GEN) 187 mtspr SPRN_SPRG_GEN_SCRATCH,r10 188 SPECIAL_EXC_LOAD(r10,SPRG_TLB) 189 mtspr SPRN_SPRG_TLB_SCRATCH,r10 190 SPECIAL_EXC_LOAD(r10,MAS0) 191 mtspr SPRN_MAS0,r10 192 SPECIAL_EXC_LOAD(r10,MAS1) 193 mtspr SPRN_MAS1,r10 194 SPECIAL_EXC_LOAD(r10,MAS2) 195 mtspr SPRN_MAS2,r10 196 SPECIAL_EXC_LOAD(r10,MAS3) 197 mtspr SPRN_MAS3,r10 198 SPECIAL_EXC_LOAD(r10,MAS6) 199 mtspr SPRN_MAS6,r10 200 SPECIAL_EXC_LOAD(r10,MAS7) 201 mtspr SPRN_MAS7,r10 202BEGIN_FTR_SECTION 203 SPECIAL_EXC_LOAD(r10,MAS5) 204 mtspr SPRN_MAS5,r10 205 SPECIAL_EXC_LOAD(r10,MAS8) 206 mtspr SPRN_MAS8,r10 207END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) 208 209 lbz r6,PACASOFTIRQEN(r13) 210 ld r5,SOFTE(r1) 211 212 /* Interrupts had better not already be enabled... */ 213 twnei r6,0 214 215 cmpwi cr0,r5,0 216 beq 1f 217 218 TRACE_ENABLE_INTS 219 stb r5,PACASOFTIRQEN(r13) 2201: 221 /* 222 * Restore PACAIRQHAPPENED rather than setting it based on 223 * the return MSR[EE], since we could have interrupted 224 * __check_irq_replay() or other inconsistent transitory 225 * states that must remain that way. 226 */ 227 SPECIAL_EXC_LOAD(r10,IRQHAPPENED) 228 stb r10,PACAIRQHAPPENED(r13) 229 230 SPECIAL_EXC_LOAD(r10,DEAR) 231 mtspr SPRN_DEAR,r10 232 SPECIAL_EXC_LOAD(r10,ESR) 233 mtspr SPRN_ESR,r10 234 235 stdcx. r0,0,r1 /* to clear the reservation */ 236 237 REST_4GPRS(2, r1) 238 REST_4GPRS(6, r1) 239 240 ld r10,_CTR(r1) 241 ld r11,_XER(r1) 242 mtctr r10 243 mtxer r11 244 245 blr 246 247.macro ret_from_level srr0 srr1 paca_ex scratch 248 bl ret_from_level_except 249 250 ld r10,_LINK(r1) 251 ld r11,_CCR(r1) 252 ld r0,GPR13(r1) 253 mtlr r10 254 mtcr r11 255 256 ld r10,GPR10(r1) 257 ld r11,GPR11(r1) 258 ld r12,GPR12(r1) 259 mtspr \scratch,r0 260 261 std r10,\paca_ex+EX_R10(r13); 262 std r11,\paca_ex+EX_R11(r13); 263 ld r10,_NIP(r1) 264 ld r11,_MSR(r1) 265 ld r0,GPR0(r1) 266 ld r1,GPR1(r1) 267 mtspr \srr0,r10 268 mtspr \srr1,r11 269 ld r10,\paca_ex+EX_R10(r13) 270 ld r11,\paca_ex+EX_R11(r13) 271 mfspr r13,\scratch 272.endm 273 274ret_from_crit_except: 275 ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH 276 rfci 277 278ret_from_mc_except: 279 ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH 280 rfmci 281 282/* Exception prolog code for all exceptions */ 283#define EXCEPTION_PROLOG(n, intnum, type, addition) \ 284 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \ 285 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \ 286 std r10,PACA_EX##type+EX_R10(r13); \ 287 std r11,PACA_EX##type+EX_R11(r13); \ 288 mfcr r10; /* save CR */ \ 289 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \ 290 DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \ 291 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \ 292 addition; /* additional code for that exc. */ \ 293 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \ 294 type##_SET_KSTACK; /* get special stack if necessary */\ 295 andi. r10,r11,MSR_PR; /* save stack pointer */ \ 296 beq 1f; /* branch around if supervisor */ \ 297 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\ 2981: cmpdi cr1,r1,0; /* check if SP makes sense */ \ 299 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \ 300 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */ 301 302/* Exception type-specific macros */ 303#define GEN_SET_KSTACK \ 304 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ 305#define SPRN_GEN_SRR0 SPRN_SRR0 306#define SPRN_GEN_SRR1 SPRN_SRR1 307 308#define GDBELL_SET_KSTACK GEN_SET_KSTACK 309#define SPRN_GDBELL_SRR0 SPRN_GSRR0 310#define SPRN_GDBELL_SRR1 SPRN_GSRR1 311 312#define CRIT_SET_KSTACK \ 313 ld r1,PACA_CRIT_STACK(r13); \ 314 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 315#define SPRN_CRIT_SRR0 SPRN_CSRR0 316#define SPRN_CRIT_SRR1 SPRN_CSRR1 317 318#define DBG_SET_KSTACK \ 319 ld r1,PACA_DBG_STACK(r13); \ 320 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 321#define SPRN_DBG_SRR0 SPRN_DSRR0 322#define SPRN_DBG_SRR1 SPRN_DSRR1 323 324#define MC_SET_KSTACK \ 325 ld r1,PACA_MC_STACK(r13); \ 326 subi r1,r1,SPECIAL_EXC_FRAME_SIZE 327#define SPRN_MC_SRR0 SPRN_MCSRR0 328#define SPRN_MC_SRR1 SPRN_MCSRR1 329 330#define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \ 331 EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n)) 332 333#define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \ 334 EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n)) 335 336#define DBG_EXCEPTION_PROLOG(n, intnum, addition) \ 337 EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n)) 338 339#define MC_EXCEPTION_PROLOG(n, intnum, addition) \ 340 EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n)) 341 342#define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \ 343 EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n)) 344 345/* Variants of the "addition" argument for the prolog 346 */ 347#define PROLOG_ADDITION_NONE_GEN(n) 348#define PROLOG_ADDITION_NONE_GDBELL(n) 349#define PROLOG_ADDITION_NONE_CRIT(n) 350#define PROLOG_ADDITION_NONE_DBG(n) 351#define PROLOG_ADDITION_NONE_MC(n) 352 353#define PROLOG_ADDITION_MASKABLE_GEN(n) \ 354 lbz r10,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */ \ 355 cmpwi cr0,r10,0; /* yes -> go out of line */ \ 356 beq masked_interrupt_book3e_##n 357 358#define PROLOG_ADDITION_2REGS_GEN(n) \ 359 std r14,PACA_EXGEN+EX_R14(r13); \ 360 std r15,PACA_EXGEN+EX_R15(r13) 361 362#define PROLOG_ADDITION_1REG_GEN(n) \ 363 std r14,PACA_EXGEN+EX_R14(r13); 364 365#define PROLOG_ADDITION_2REGS_CRIT(n) \ 366 std r14,PACA_EXCRIT+EX_R14(r13); \ 367 std r15,PACA_EXCRIT+EX_R15(r13) 368 369#define PROLOG_ADDITION_2REGS_DBG(n) \ 370 std r14,PACA_EXDBG+EX_R14(r13); \ 371 std r15,PACA_EXDBG+EX_R15(r13) 372 373#define PROLOG_ADDITION_2REGS_MC(n) \ 374 std r14,PACA_EXMC+EX_R14(r13); \ 375 std r15,PACA_EXMC+EX_R15(r13) 376 377 378/* Core exception code for all exceptions except TLB misses. */ 379#define EXCEPTION_COMMON_LVL(n, scratch, excf) \ 380exc_##n##_common: \ 381 std r0,GPR0(r1); /* save r0 in stackframe */ \ 382 std r2,GPR2(r1); /* save r2 in stackframe */ \ 383 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ 384 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ 385 std r9,GPR9(r1); /* save r9 in stackframe */ \ 386 std r10,_NIP(r1); /* save SRR0 to stackframe */ \ 387 std r11,_MSR(r1); /* save SRR1 to stackframe */ \ 388 beq 2f; /* if from kernel mode */ \ 389 ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \ 3902: ld r3,excf+EX_R10(r13); /* get back r10 */ \ 391 ld r4,excf+EX_R11(r13); /* get back r11 */ \ 392 mfspr r5,scratch; /* get back r13 */ \ 393 std r12,GPR12(r1); /* save r12 in stackframe */ \ 394 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ 395 mflr r6; /* save LR in stackframe */ \ 396 mfctr r7; /* save CTR in stackframe */ \ 397 mfspr r8,SPRN_XER; /* save XER in stackframe */ \ 398 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \ 399 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \ 400 lbz r11,PACASOFTIRQEN(r13); /* get current IRQ softe */ \ 401 ld r12,exception_marker@toc(r2); \ 402 li r0,0; \ 403 std r3,GPR10(r1); /* save r10 to stackframe */ \ 404 std r4,GPR11(r1); /* save r11 to stackframe */ \ 405 std r5,GPR13(r1); /* save it to stackframe */ \ 406 std r6,_LINK(r1); \ 407 std r7,_CTR(r1); \ 408 std r8,_XER(r1); \ 409 li r3,(n)+1; /* indicate partial regs in trap */ \ 410 std r9,0(r1); /* store stack frame back link */ \ 411 std r10,_CCR(r1); /* store orig CR in stackframe */ \ 412 std r9,GPR1(r1); /* store stack frame back link */ \ 413 std r11,SOFTE(r1); /* and save it to stackframe */ \ 414 std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \ 415 std r3,_TRAP(r1); /* set trap number */ \ 416 std r0,RESULT(r1); /* clear regs->result */ 417 418#define EXCEPTION_COMMON(n) \ 419 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN) 420#define EXCEPTION_COMMON_CRIT(n) \ 421 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT) 422#define EXCEPTION_COMMON_MC(n) \ 423 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC) 424#define EXCEPTION_COMMON_DBG(n) \ 425 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG) 426 427/* 428 * This is meant for exceptions that don't immediately hard-enable. We 429 * set a bit in paca->irq_happened to ensure that a subsequent call to 430 * arch_local_irq_restore() will properly hard-enable and avoid the 431 * fast-path, and then reconcile irq state. 432 */ 433#define INTS_DISABLE RECONCILE_IRQ_STATE(r3,r4) 434 435/* 436 * This is called by exceptions that don't use INTS_DISABLE (that did not 437 * touch irq indicators in the PACA). This will restore MSR:EE to it's 438 * previous value 439 * 440 * XXX In the long run, we may want to open-code it in order to separate the 441 * load from the wrtee, thus limiting the latency caused by the dependency 442 * but at this point, I'll favor code clarity until we have a near to final 443 * implementation 444 */ 445#define INTS_RESTORE_HARD \ 446 ld r11,_MSR(r1); \ 447 wrtee r11; 448 449/* XXX FIXME: Restore r14/r15 when necessary */ 450#define BAD_STACK_TRAMPOLINE(n) \ 451exc_##n##_bad_stack: \ 452 li r1,(n); /* get exception number */ \ 453 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \ 454 b bad_stack_book3e; /* bad stack error */ 455 456/* WARNING: If you change the layout of this stub, make sure you chcek 457 * the debug exception handler which handles single stepping 458 * into exceptions from userspace, and the MM code in 459 * arch/powerpc/mm/tlb_nohash.c which patches the branch here 460 * and would need to be updated if that branch is moved 461 */ 462#define EXCEPTION_STUB(loc, label) \ 463 . = interrupt_base_book3e + loc; \ 464 nop; /* To make debug interrupts happy */ \ 465 b exc_##label##_book3e; 466 467#define ACK_NONE(r) 468#define ACK_DEC(r) \ 469 lis r,TSR_DIS@h; \ 470 mtspr SPRN_TSR,r 471#define ACK_FIT(r) \ 472 lis r,TSR_FIS@h; \ 473 mtspr SPRN_TSR,r 474 475/* Used by asynchronous interrupt that may happen in the idle loop. 476 * 477 * This check if the thread was in the idle loop, and if yes, returns 478 * to the caller rather than the PC. This is to avoid a race if 479 * interrupts happen before the wait instruction. 480 */ 481#define CHECK_NAPPING() \ 482 CURRENT_THREAD_INFO(r11, r1); \ 483 ld r10,TI_LOCAL_FLAGS(r11); \ 484 andi. r9,r10,_TLF_NAPPING; \ 485 beq+ 1f; \ 486 ld r8,_LINK(r1); \ 487 rlwinm r7,r10,0,~_TLF_NAPPING; \ 488 std r8,_NIP(r1); \ 489 std r7,TI_LOCAL_FLAGS(r11); \ 4901: 491 492 493#define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \ 494 START_EXCEPTION(label); \ 495 NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\ 496 EXCEPTION_COMMON(trapnum) \ 497 INTS_DISABLE; \ 498 ack(r8); \ 499 CHECK_NAPPING(); \ 500 addi r3,r1,STACK_FRAME_OVERHEAD; \ 501 bl hdlr; \ 502 b ret_from_except_lite; 503 504/* This value is used to mark exception frames on the stack. */ 505 .section ".toc","aw" 506exception_marker: 507 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER 508 509 510/* 511 * And here we have the exception vectors ! 512 */ 513 514 .text 515 .balign 0x1000 516 .globl interrupt_base_book3e 517interrupt_base_book3e: /* fake trap */ 518 EXCEPTION_STUB(0x000, machine_check) 519 EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */ 520 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */ 521 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */ 522 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */ 523 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */ 524 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */ 525 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */ 526 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */ 527 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */ 528 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */ 529 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */ 530 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */ 531 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */ 532 EXCEPTION_STUB(0x1c0, data_tlb_miss) 533 EXCEPTION_STUB(0x1e0, instruction_tlb_miss) 534 EXCEPTION_STUB(0x200, altivec_unavailable) 535 EXCEPTION_STUB(0x220, altivec_assist) 536 EXCEPTION_STUB(0x260, perfmon) 537 EXCEPTION_STUB(0x280, doorbell) 538 EXCEPTION_STUB(0x2a0, doorbell_crit) 539 EXCEPTION_STUB(0x2c0, guest_doorbell) 540 EXCEPTION_STUB(0x2e0, guest_doorbell_crit) 541 EXCEPTION_STUB(0x300, hypercall) 542 EXCEPTION_STUB(0x320, ehpriv) 543 EXCEPTION_STUB(0x340, lrat_error) 544 545 .globl interrupt_end_book3e 546interrupt_end_book3e: 547 548/* Critical Input Interrupt */ 549 START_EXCEPTION(critical_input); 550 CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL, 551 PROLOG_ADDITION_NONE) 552 EXCEPTION_COMMON_CRIT(0x100) 553 bl save_nvgprs 554 bl special_reg_save 555 CHECK_NAPPING(); 556 addi r3,r1,STACK_FRAME_OVERHEAD 557 bl unknown_exception 558 b ret_from_crit_except 559 560/* Machine Check Interrupt */ 561 START_EXCEPTION(machine_check); 562 MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK, 563 PROLOG_ADDITION_NONE) 564 EXCEPTION_COMMON_MC(0x000) 565 bl save_nvgprs 566 bl special_reg_save 567 CHECK_NAPPING(); 568 addi r3,r1,STACK_FRAME_OVERHEAD 569 bl machine_check_exception 570 b ret_from_mc_except 571 572/* Data Storage Interrupt */ 573 START_EXCEPTION(data_storage) 574 NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE, 575 PROLOG_ADDITION_2REGS) 576 mfspr r14,SPRN_DEAR 577 mfspr r15,SPRN_ESR 578 EXCEPTION_COMMON(0x300) 579 INTS_DISABLE 580 b storage_fault_common 581 582/* Instruction Storage Interrupt */ 583 START_EXCEPTION(instruction_storage); 584 NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE, 585 PROLOG_ADDITION_2REGS) 586 li r15,0 587 mr r14,r10 588 EXCEPTION_COMMON(0x400) 589 INTS_DISABLE 590 b storage_fault_common 591 592/* External Input Interrupt */ 593 MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL, 594 external_input, do_IRQ, ACK_NONE) 595 596/* Alignment */ 597 START_EXCEPTION(alignment); 598 NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT, 599 PROLOG_ADDITION_2REGS) 600 mfspr r14,SPRN_DEAR 601 mfspr r15,SPRN_ESR 602 EXCEPTION_COMMON(0x600) 603 b alignment_more /* no room, go out of line */ 604 605/* Program Interrupt */ 606 START_EXCEPTION(program); 607 NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM, 608 PROLOG_ADDITION_1REG) 609 mfspr r14,SPRN_ESR 610 EXCEPTION_COMMON(0x700) 611 INTS_DISABLE 612 std r14,_DSISR(r1) 613 addi r3,r1,STACK_FRAME_OVERHEAD 614 ld r14,PACA_EXGEN+EX_R14(r13) 615 bl save_nvgprs 616 bl program_check_exception 617 b ret_from_except 618 619/* Floating Point Unavailable Interrupt */ 620 START_EXCEPTION(fp_unavailable); 621 NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL, 622 PROLOG_ADDITION_NONE) 623 /* we can probably do a shorter exception entry for that one... */ 624 EXCEPTION_COMMON(0x800) 625 ld r12,_MSR(r1) 626 andi. r0,r12,MSR_PR; 627 beq- 1f 628 bl load_up_fpu 629 b fast_exception_return 6301: INTS_DISABLE 631 bl save_nvgprs 632 addi r3,r1,STACK_FRAME_OVERHEAD 633 bl kernel_fp_unavailable_exception 634 b ret_from_except 635 636/* Altivec Unavailable Interrupt */ 637 START_EXCEPTION(altivec_unavailable); 638 NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL, 639 PROLOG_ADDITION_NONE) 640 /* we can probably do a shorter exception entry for that one... */ 641 EXCEPTION_COMMON(0x200) 642#ifdef CONFIG_ALTIVEC 643BEGIN_FTR_SECTION 644 ld r12,_MSR(r1) 645 andi. r0,r12,MSR_PR; 646 beq- 1f 647 bl load_up_altivec 648 b fast_exception_return 6491: 650END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 651#endif 652 INTS_DISABLE 653 bl save_nvgprs 654 addi r3,r1,STACK_FRAME_OVERHEAD 655 bl altivec_unavailable_exception 656 b ret_from_except 657 658/* AltiVec Assist */ 659 START_EXCEPTION(altivec_assist); 660 NORMAL_EXCEPTION_PROLOG(0x220, 661 BOOKE_INTERRUPT_ALTIVEC_ASSIST, 662 PROLOG_ADDITION_NONE) 663 EXCEPTION_COMMON(0x220) 664 INTS_DISABLE 665 bl save_nvgprs 666 addi r3,r1,STACK_FRAME_OVERHEAD 667#ifdef CONFIG_ALTIVEC 668BEGIN_FTR_SECTION 669 bl altivec_assist_exception 670END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 671#else 672 bl unknown_exception 673#endif 674 b ret_from_except 675 676 677/* Decrementer Interrupt */ 678 MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER, 679 decrementer, timer_interrupt, ACK_DEC) 680 681/* Fixed Interval Timer Interrupt */ 682 MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT, 683 fixed_interval, unknown_exception, ACK_FIT) 684 685/* Watchdog Timer Interrupt */ 686 START_EXCEPTION(watchdog); 687 CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG, 688 PROLOG_ADDITION_NONE) 689 EXCEPTION_COMMON_CRIT(0x9f0) 690 bl save_nvgprs 691 bl special_reg_save 692 CHECK_NAPPING(); 693 addi r3,r1,STACK_FRAME_OVERHEAD 694#ifdef CONFIG_BOOKE_WDT 695 bl WatchdogException 696#else 697 bl unknown_exception 698#endif 699 b ret_from_crit_except 700 701/* System Call Interrupt */ 702 START_EXCEPTION(system_call) 703 mr r9,r13 /* keep a copy of userland r13 */ 704 mfspr r11,SPRN_SRR0 /* get return address */ 705 mfspr r12,SPRN_SRR1 /* get previous MSR */ 706 mfspr r13,SPRN_SPRG_PACA /* get our PACA */ 707 b system_call_common 708 709/* Auxiliary Processor Unavailable Interrupt */ 710 START_EXCEPTION(ap_unavailable); 711 NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL, 712 PROLOG_ADDITION_NONE) 713 EXCEPTION_COMMON(0xf20) 714 INTS_DISABLE 715 bl save_nvgprs 716 addi r3,r1,STACK_FRAME_OVERHEAD 717 bl unknown_exception 718 b ret_from_except 719 720/* Debug exception as a critical interrupt*/ 721 START_EXCEPTION(debug_crit); 722 CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, 723 PROLOG_ADDITION_2REGS) 724 725 /* 726 * If there is a single step or branch-taken exception in an 727 * exception entry sequence, it was probably meant to apply to 728 * the code where the exception occurred (since exception entry 729 * doesn't turn off DE automatically). We simulate the effect 730 * of turning off DE on entry to an exception handler by turning 731 * off DE in the CSRR1 value and clearing the debug status. 732 */ 733 734 mfspr r14,SPRN_DBSR /* check single-step/branch taken */ 735 andis. r15,r14,(DBSR_IC|DBSR_BT)@h 736 beq+ 1f 737 738 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e) 739 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e) 740 cmpld cr0,r10,r14 741 cmpld cr1,r10,r15 742 blt+ cr0,1f 743 bge+ cr1,1f 744 745 /* here it looks like we got an inappropriate debug exception. */ 746 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ 747 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */ 748 mtspr SPRN_DBSR,r14 749 mtspr SPRN_CSRR1,r11 750 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */ 751 ld r1,PACA_EXCRIT+EX_R1(r13) 752 ld r14,PACA_EXCRIT+EX_R14(r13) 753 ld r15,PACA_EXCRIT+EX_R15(r13) 754 mtcr r10 755 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */ 756 ld r11,PACA_EXCRIT+EX_R11(r13) 757 mfspr r13,SPRN_SPRG_CRIT_SCRATCH 758 rfci 759 760 /* Normal debug exception */ 761 /* XXX We only handle coming from userspace for now since we can't 762 * quite save properly an interrupted kernel state yet 763 */ 7641: andi. r14,r11,MSR_PR; /* check for userspace again */ 765 beq kernel_dbg_exc; /* if from kernel mode */ 766 767 /* Now we mash up things to make it look like we are coming on a 768 * normal exception 769 */ 770 mfspr r14,SPRN_DBSR 771 EXCEPTION_COMMON_CRIT(0xd00) 772 std r14,_DSISR(r1) 773 addi r3,r1,STACK_FRAME_OVERHEAD 774 mr r4,r14 775 ld r14,PACA_EXCRIT+EX_R14(r13) 776 ld r15,PACA_EXCRIT+EX_R15(r13) 777 bl save_nvgprs 778 bl DebugException 779 b ret_from_except 780 781kernel_dbg_exc: 782 b . /* NYI */ 783 784/* Debug exception as a debug interrupt*/ 785 START_EXCEPTION(debug_debug); 786 DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG, 787 PROLOG_ADDITION_2REGS) 788 789 /* 790 * If there is a single step or branch-taken exception in an 791 * exception entry sequence, it was probably meant to apply to 792 * the code where the exception occurred (since exception entry 793 * doesn't turn off DE automatically). We simulate the effect 794 * of turning off DE on entry to an exception handler by turning 795 * off DE in the DSRR1 value and clearing the debug status. 796 */ 797 798 mfspr r14,SPRN_DBSR /* check single-step/branch taken */ 799 andis. r15,r14,(DBSR_IC|DBSR_BT)@h 800 beq+ 1f 801 802 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e) 803 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e) 804 cmpld cr0,r10,r14 805 cmpld cr1,r10,r15 806 blt+ cr0,1f 807 bge+ cr1,1f 808 809 /* here it looks like we got an inappropriate debug exception. */ 810 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */ 811 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */ 812 mtspr SPRN_DBSR,r14 813 mtspr SPRN_DSRR1,r11 814 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */ 815 ld r1,PACA_EXDBG+EX_R1(r13) 816 ld r14,PACA_EXDBG+EX_R14(r13) 817 ld r15,PACA_EXDBG+EX_R15(r13) 818 mtcr r10 819 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */ 820 ld r11,PACA_EXDBG+EX_R11(r13) 821 mfspr r13,SPRN_SPRG_DBG_SCRATCH 822 rfdi 823 824 /* Normal debug exception */ 825 /* XXX We only handle coming from userspace for now since we can't 826 * quite save properly an interrupted kernel state yet 827 */ 8281: andi. r14,r11,MSR_PR; /* check for userspace again */ 829 beq kernel_dbg_exc; /* if from kernel mode */ 830 831 /* Now we mash up things to make it look like we are coming on a 832 * normal exception 833 */ 834 mfspr r14,SPRN_DBSR 835 EXCEPTION_COMMON_DBG(0xd08) 836 INTS_DISABLE 837 std r14,_DSISR(r1) 838 addi r3,r1,STACK_FRAME_OVERHEAD 839 mr r4,r14 840 ld r14,PACA_EXDBG+EX_R14(r13) 841 ld r15,PACA_EXDBG+EX_R15(r13) 842 bl save_nvgprs 843 bl DebugException 844 b ret_from_except 845 846 START_EXCEPTION(perfmon); 847 NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR, 848 PROLOG_ADDITION_NONE) 849 EXCEPTION_COMMON(0x260) 850 INTS_DISABLE 851 CHECK_NAPPING() 852 addi r3,r1,STACK_FRAME_OVERHEAD 853 bl performance_monitor_exception 854 b ret_from_except_lite 855 856/* Doorbell interrupt */ 857 MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL, 858 doorbell, doorbell_exception, ACK_NONE) 859 860/* Doorbell critical Interrupt */ 861 START_EXCEPTION(doorbell_crit); 862 CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL, 863 PROLOG_ADDITION_NONE) 864 EXCEPTION_COMMON_CRIT(0x2a0) 865 bl save_nvgprs 866 bl special_reg_save 867 CHECK_NAPPING(); 868 addi r3,r1,STACK_FRAME_OVERHEAD 869 bl unknown_exception 870 b ret_from_crit_except 871 872/* 873 * Guest doorbell interrupt 874 * This general exception use GSRRx save/restore registers 875 */ 876 START_EXCEPTION(guest_doorbell); 877 GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL, 878 PROLOG_ADDITION_NONE) 879 EXCEPTION_COMMON(0x2c0) 880 addi r3,r1,STACK_FRAME_OVERHEAD 881 bl save_nvgprs 882 INTS_RESTORE_HARD 883 bl unknown_exception 884 b ret_from_except 885 886/* Guest Doorbell critical Interrupt */ 887 START_EXCEPTION(guest_doorbell_crit); 888 CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT, 889 PROLOG_ADDITION_NONE) 890 EXCEPTION_COMMON_CRIT(0x2e0) 891 bl save_nvgprs 892 bl special_reg_save 893 CHECK_NAPPING(); 894 addi r3,r1,STACK_FRAME_OVERHEAD 895 bl unknown_exception 896 b ret_from_crit_except 897 898/* Hypervisor call */ 899 START_EXCEPTION(hypercall); 900 NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL, 901 PROLOG_ADDITION_NONE) 902 EXCEPTION_COMMON(0x310) 903 addi r3,r1,STACK_FRAME_OVERHEAD 904 bl save_nvgprs 905 INTS_RESTORE_HARD 906 bl unknown_exception 907 b ret_from_except 908 909/* Embedded Hypervisor priviledged */ 910 START_EXCEPTION(ehpriv); 911 NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV, 912 PROLOG_ADDITION_NONE) 913 EXCEPTION_COMMON(0x320) 914 addi r3,r1,STACK_FRAME_OVERHEAD 915 bl save_nvgprs 916 INTS_RESTORE_HARD 917 bl unknown_exception 918 b ret_from_except 919 920/* LRAT Error interrupt */ 921 START_EXCEPTION(lrat_error); 922 NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR, 923 PROLOG_ADDITION_NONE) 924 EXCEPTION_COMMON(0x340) 925 addi r3,r1,STACK_FRAME_OVERHEAD 926 bl .save_nvgprs 927 INTS_RESTORE_HARD 928 bl .unknown_exception 929 b .ret_from_except 930 931/* 932 * An interrupt came in while soft-disabled; We mark paca->irq_happened 933 * accordingly and if the interrupt is level sensitive, we hard disable 934 */ 935 936.macro masked_interrupt_book3e paca_irq full_mask 937 lbz r10,PACAIRQHAPPENED(r13) 938 ori r10,r10,\paca_irq 939 stb r10,PACAIRQHAPPENED(r13) 940 941 .if \full_mask == 1 942 rldicl r10,r11,48,1 /* clear MSR_EE */ 943 rotldi r11,r10,16 944 mtspr SPRN_SRR1,r11 945 .endif 946 947 lwz r11,PACA_EXGEN+EX_CR(r13) 948 mtcr r11 949 ld r10,PACA_EXGEN+EX_R10(r13) 950 ld r11,PACA_EXGEN+EX_R11(r13) 951 mfspr r13,SPRN_SPRG_GEN_SCRATCH 952 rfi 953 b . 954.endm 955 956masked_interrupt_book3e_0x500: 957 // XXX When adding support for EPR, use PACA_IRQ_EE_EDGE 958 masked_interrupt_book3e PACA_IRQ_EE 1 959 960masked_interrupt_book3e_0x900: 961 ACK_DEC(r10); 962 masked_interrupt_book3e PACA_IRQ_DEC 0 963 964masked_interrupt_book3e_0x980: 965 ACK_FIT(r10); 966 masked_interrupt_book3e PACA_IRQ_DEC 0 967 968masked_interrupt_book3e_0x280: 969masked_interrupt_book3e_0x2c0: 970 masked_interrupt_book3e PACA_IRQ_DBELL 0 971 972/* 973 * Called from arch_local_irq_enable when an interrupt needs 974 * to be resent. r3 contains either 0x500,0x900,0x260 or 0x280 975 * to indicate the kind of interrupt. MSR:EE is already off. 976 * We generate a stackframe like if a real interrupt had happened. 977 * 978 * Note: While MSR:EE is off, we need to make sure that _MSR 979 * in the generated frame has EE set to 1 or the exception 980 * handler will not properly re-enable them. 981 */ 982_GLOBAL(__replay_interrupt) 983 /* We are going to jump to the exception common code which 984 * will retrieve various register values from the PACA which 985 * we don't give a damn about. 986 */ 987 mflr r10 988 mfmsr r11 989 mfcr r4 990 mtspr SPRN_SPRG_GEN_SCRATCH,r13; 991 std r1,PACA_EXGEN+EX_R1(r13); 992 stw r4,PACA_EXGEN+EX_CR(r13); 993 ori r11,r11,MSR_EE 994 subi r1,r1,INT_FRAME_SIZE; 995 cmpwi cr0,r3,0x500 996 beq exc_0x500_common 997 cmpwi cr0,r3,0x900 998 beq exc_0x900_common 999 cmpwi cr0,r3,0x280 1000 beq exc_0x280_common 1001 blr 1002 1003 1004/* 1005 * This is called from 0x300 and 0x400 handlers after the prologs with 1006 * r14 and r15 containing the fault address and error code, with the 1007 * original values stashed away in the PACA 1008 */ 1009storage_fault_common: 1010 std r14,_DAR(r1) 1011 std r15,_DSISR(r1) 1012 addi r3,r1,STACK_FRAME_OVERHEAD 1013 mr r4,r14 1014 mr r5,r15 1015 ld r14,PACA_EXGEN+EX_R14(r13) 1016 ld r15,PACA_EXGEN+EX_R15(r13) 1017 bl do_page_fault 1018 cmpdi r3,0 1019 bne- 1f 1020 b ret_from_except_lite 10211: bl save_nvgprs 1022 mr r5,r3 1023 addi r3,r1,STACK_FRAME_OVERHEAD 1024 ld r4,_DAR(r1) 1025 bl bad_page_fault 1026 b ret_from_except 1027 1028/* 1029 * Alignment exception doesn't fit entirely in the 0x100 bytes so it 1030 * continues here. 1031 */ 1032alignment_more: 1033 std r14,_DAR(r1) 1034 std r15,_DSISR(r1) 1035 addi r3,r1,STACK_FRAME_OVERHEAD 1036 ld r14,PACA_EXGEN+EX_R14(r13) 1037 ld r15,PACA_EXGEN+EX_R15(r13) 1038 bl save_nvgprs 1039 INTS_RESTORE_HARD 1040 bl alignment_exception 1041 b ret_from_except 1042 1043/* 1044 * We branch here from entry_64.S for the last stage of the exception 1045 * return code path. MSR:EE is expected to be off at that point 1046 */ 1047_GLOBAL(exception_return_book3e) 1048 b 1f 1049 1050/* This is the return from load_up_fpu fast path which could do with 1051 * less GPR restores in fact, but for now we have a single return path 1052 */ 1053 .globl fast_exception_return 1054fast_exception_return: 1055 wrteei 0 10561: mr r0,r13 1057 ld r10,_MSR(r1) 1058 REST_4GPRS(2, r1) 1059 andi. r6,r10,MSR_PR 1060 REST_2GPRS(6, r1) 1061 beq 1f 1062 ACCOUNT_CPU_USER_EXIT(r10, r11) 1063 ld r0,GPR13(r1) 1064 10651: stdcx. r0,0,r1 /* to clear the reservation */ 1066 1067 ld r8,_CCR(r1) 1068 ld r9,_LINK(r1) 1069 ld r10,_CTR(r1) 1070 ld r11,_XER(r1) 1071 mtcr r8 1072 mtlr r9 1073 mtctr r10 1074 mtxer r11 1075 REST_2GPRS(8, r1) 1076 ld r10,GPR10(r1) 1077 ld r11,GPR11(r1) 1078 ld r12,GPR12(r1) 1079 mtspr SPRN_SPRG_GEN_SCRATCH,r0 1080 1081 std r10,PACA_EXGEN+EX_R10(r13); 1082 std r11,PACA_EXGEN+EX_R11(r13); 1083 ld r10,_NIP(r1) 1084 ld r11,_MSR(r1) 1085 ld r0,GPR0(r1) 1086 ld r1,GPR1(r1) 1087 mtspr SPRN_SRR0,r10 1088 mtspr SPRN_SRR1,r11 1089 ld r10,PACA_EXGEN+EX_R10(r13) 1090 ld r11,PACA_EXGEN+EX_R11(r13) 1091 mfspr r13,SPRN_SPRG_GEN_SCRATCH 1092 rfi 1093 1094/* 1095 * Trampolines used when spotting a bad kernel stack pointer in 1096 * the exception entry code. 1097 * 1098 * TODO: move some bits like SRR0 read to trampoline, pass PACA 1099 * index around, etc... to handle crit & mcheck 1100 */ 1101BAD_STACK_TRAMPOLINE(0x000) 1102BAD_STACK_TRAMPOLINE(0x100) 1103BAD_STACK_TRAMPOLINE(0x200) 1104BAD_STACK_TRAMPOLINE(0x220) 1105BAD_STACK_TRAMPOLINE(0x260) 1106BAD_STACK_TRAMPOLINE(0x280) 1107BAD_STACK_TRAMPOLINE(0x2a0) 1108BAD_STACK_TRAMPOLINE(0x2c0) 1109BAD_STACK_TRAMPOLINE(0x2e0) 1110BAD_STACK_TRAMPOLINE(0x300) 1111BAD_STACK_TRAMPOLINE(0x310) 1112BAD_STACK_TRAMPOLINE(0x320) 1113BAD_STACK_TRAMPOLINE(0x340) 1114BAD_STACK_TRAMPOLINE(0x400) 1115BAD_STACK_TRAMPOLINE(0x500) 1116BAD_STACK_TRAMPOLINE(0x600) 1117BAD_STACK_TRAMPOLINE(0x700) 1118BAD_STACK_TRAMPOLINE(0x800) 1119BAD_STACK_TRAMPOLINE(0x900) 1120BAD_STACK_TRAMPOLINE(0x980) 1121BAD_STACK_TRAMPOLINE(0x9f0) 1122BAD_STACK_TRAMPOLINE(0xa00) 1123BAD_STACK_TRAMPOLINE(0xb00) 1124BAD_STACK_TRAMPOLINE(0xc00) 1125BAD_STACK_TRAMPOLINE(0xd00) 1126BAD_STACK_TRAMPOLINE(0xd08) 1127BAD_STACK_TRAMPOLINE(0xe00) 1128BAD_STACK_TRAMPOLINE(0xf00) 1129BAD_STACK_TRAMPOLINE(0xf20) 1130 1131 .globl bad_stack_book3e 1132bad_stack_book3e: 1133 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */ 1134 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */ 1135 ld r1,PACAEMERGSP(r13) 1136 subi r1,r1,64+INT_FRAME_SIZE 1137 std r10,_NIP(r1) 1138 std r11,_MSR(r1) 1139 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */ 1140 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */ 1141 std r10,GPR1(r1) 1142 std r11,_CCR(r1) 1143 mfspr r10,SPRN_DEAR 1144 mfspr r11,SPRN_ESR 1145 std r10,_DAR(r1) 1146 std r11,_DSISR(r1) 1147 std r0,GPR0(r1); /* save r0 in stackframe */ \ 1148 std r2,GPR2(r1); /* save r2 in stackframe */ \ 1149 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ 1150 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ 1151 std r9,GPR9(r1); /* save r9 in stackframe */ \ 1152 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \ 1153 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \ 1154 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \ 1155 std r3,GPR10(r1); /* save r10 to stackframe */ \ 1156 std r4,GPR11(r1); /* save r11 to stackframe */ \ 1157 std r12,GPR12(r1); /* save r12 in stackframe */ \ 1158 std r5,GPR13(r1); /* save it to stackframe */ \ 1159 mflr r10 1160 mfctr r11 1161 mfxer r12 1162 std r10,_LINK(r1) 1163 std r11,_CTR(r1) 1164 std r12,_XER(r1) 1165 SAVE_10GPRS(14,r1) 1166 SAVE_8GPRS(24,r1) 1167 lhz r12,PACA_TRAP_SAVE(r13) 1168 std r12,_TRAP(r1) 1169 addi r11,r1,INT_FRAME_SIZE 1170 std r11,0(r1) 1171 li r12,0 1172 std r12,0(r11) 1173 ld r2,PACATOC(r13) 11741: addi r3,r1,STACK_FRAME_OVERHEAD 1175 bl kernel_bad_stack 1176 b 1b 1177 1178/* 1179 * Setup the initial TLB for a core. This current implementation 1180 * assume that whatever we are running off will not conflict with 1181 * the new mapping at PAGE_OFFSET. 1182 */ 1183_GLOBAL(initial_tlb_book3e) 1184 1185 /* Look for the first TLB with IPROT set */ 1186 mfspr r4,SPRN_TLB0CFG 1187 andi. r3,r4,TLBnCFG_IPROT 1188 lis r3,MAS0_TLBSEL(0)@h 1189 bne found_iprot 1190 1191 mfspr r4,SPRN_TLB1CFG 1192 andi. r3,r4,TLBnCFG_IPROT 1193 lis r3,MAS0_TLBSEL(1)@h 1194 bne found_iprot 1195 1196 mfspr r4,SPRN_TLB2CFG 1197 andi. r3,r4,TLBnCFG_IPROT 1198 lis r3,MAS0_TLBSEL(2)@h 1199 bne found_iprot 1200 1201 lis r3,MAS0_TLBSEL(3)@h 1202 mfspr r4,SPRN_TLB3CFG 1203 /* fall through */ 1204 1205found_iprot: 1206 andi. r5,r4,TLBnCFG_HES 1207 bne have_hes 1208 1209 mflr r8 /* save LR */ 1210/* 1. Find the index of the entry we're executing in 1211 * 1212 * r3 = MAS0_TLBSEL (for the iprot array) 1213 * r4 = SPRN_TLBnCFG 1214 */ 1215 bl invstr /* Find our address */ 1216invstr: mflr r6 /* Make it accessible */ 1217 mfmsr r7 1218 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */ 1219 mfspr r7,SPRN_PID 1220 slwi r7,r7,16 1221 or r7,r7,r5 1222 mtspr SPRN_MAS6,r7 1223 tlbsx 0,r6 /* search MSR[IS], SPID=PID */ 1224 1225 mfspr r3,SPRN_MAS0 1226 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */ 1227 1228 mfspr r7,SPRN_MAS1 /* Insure IPROT set */ 1229 oris r7,r7,MAS1_IPROT@h 1230 mtspr SPRN_MAS1,r7 1231 tlbwe 1232 1233/* 2. Invalidate all entries except the entry we're executing in 1234 * 1235 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1236 * r4 = SPRN_TLBnCFG 1237 * r5 = ESEL of entry we are running in 1238 */ 1239 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */ 1240 li r6,0 /* Set Entry counter to 0 */ 12411: mr r7,r3 /* Set MAS0(TLBSEL) */ 1242 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ 1243 mtspr SPRN_MAS0,r7 1244 tlbre 1245 mfspr r7,SPRN_MAS1 1246 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ 1247 cmpw r5,r6 1248 beq skpinv /* Dont update the current execution TLB */ 1249 mtspr SPRN_MAS1,r7 1250 tlbwe 1251 isync 1252skpinv: addi r6,r6,1 /* Increment */ 1253 cmpw r6,r4 /* Are we done? */ 1254 bne 1b /* If not, repeat */ 1255 1256 /* Invalidate all TLBs */ 1257 PPC_TLBILX_ALL(0,R0) 1258 sync 1259 isync 1260 1261/* 3. Setup a temp mapping and jump to it 1262 * 1263 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1264 * r5 = ESEL of entry we are running in 1265 */ 1266 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */ 1267 addi r7,r7,0x1 1268 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */ 1269 mtspr SPRN_MAS0,r4 1270 tlbre 1271 1272 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */ 1273 mtspr SPRN_MAS0,r4 1274 1275 mfspr r7,SPRN_MAS1 1276 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */ 1277 mtspr SPRN_MAS1,r6 1278 1279 tlbwe 1280 1281 mfmsr r6 1282 xori r6,r6,MSR_IS 1283 mtspr SPRN_SRR1,r6 1284 bl 1f /* Find our address */ 12851: mflr r6 1286 addi r6,r6,(2f - 1b) 1287 mtspr SPRN_SRR0,r6 1288 rfi 12892: 1290 1291/* 4. Clear out PIDs & Search info 1292 * 1293 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1294 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1295 * r5 = MAS3 1296 */ 1297 li r6,0 1298 mtspr SPRN_MAS6,r6 1299 mtspr SPRN_PID,r6 1300 1301/* 5. Invalidate mapping we started in 1302 * 1303 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1304 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1305 * r5 = MAS3 1306 */ 1307 mtspr SPRN_MAS0,r3 1308 tlbre 1309 mfspr r6,SPRN_MAS1 1310 rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */ 1311 mtspr SPRN_MAS1,r6 1312 tlbwe 1313 sync 1314 isync 1315 1316/* 1317 * The mapping only needs to be cache-coherent on SMP, except on 1318 * Freescale e500mc derivatives where it's also needed for coherent DMA. 1319 */ 1320#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC) 1321#define M_IF_NEEDED MAS2_M 1322#else 1323#define M_IF_NEEDED 0 1324#endif 1325 1326/* 6. Setup KERNELBASE mapping in TLB[0] 1327 * 1328 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in 1329 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1330 * r5 = MAS3 1331 */ 1332 rlwinm r3,r3,0,16,3 /* clear ESEL */ 1333 mtspr SPRN_MAS0,r3 1334 lis r6,(MAS1_VALID|MAS1_IPROT)@h 1335 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l 1336 mtspr SPRN_MAS1,r6 1337 1338 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_NEEDED) 1339 mtspr SPRN_MAS2,r6 1340 1341 rlwinm r5,r5,0,0,25 1342 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX 1343 mtspr SPRN_MAS3,r5 1344 li r5,-1 1345 rlwinm r5,r5,0,0,25 1346 1347 tlbwe 1348 1349/* 7. Jump to KERNELBASE mapping 1350 * 1351 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping 1352 */ 1353 /* Now we branch the new virtual address mapped by this entry */ 1354 LOAD_REG_IMMEDIATE(r6,2f) 1355 lis r7,MSR_KERNEL@h 1356 ori r7,r7,MSR_KERNEL@l 1357 mtspr SPRN_SRR0,r6 1358 mtspr SPRN_SRR1,r7 1359 rfi /* start execution out of TLB1[0] entry */ 13602: 1361 1362/* 8. Clear out the temp mapping 1363 * 1364 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in 1365 */ 1366 mtspr SPRN_MAS0,r4 1367 tlbre 1368 mfspr r5,SPRN_MAS1 1369 rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */ 1370 mtspr SPRN_MAS1,r5 1371 tlbwe 1372 sync 1373 isync 1374 1375 /* We translate LR and return */ 1376 tovirt(r8,r8) 1377 mtlr r8 1378 blr 1379 1380have_hes: 1381 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the 1382 * kernel linear mapping. We also set MAS8 once for all here though 1383 * that will have to be made dependent on whether we are running under 1384 * a hypervisor I suppose. 1385 */ 1386 1387 /* BEWARE, MAGIC 1388 * This code is called as an ordinary function on the boot CPU. But to 1389 * avoid duplication, this code is also used in SCOM bringup of 1390 * secondary CPUs. We read the code between the initial_tlb_code_start 1391 * and initial_tlb_code_end labels one instruction at a time and RAM it 1392 * into the new core via SCOM. That doesn't process branches, so there 1393 * must be none between those two labels. It also means if this code 1394 * ever takes any parameters, the SCOM code must also be updated to 1395 * provide them. 1396 */ 1397 .globl a2_tlbinit_code_start 1398a2_tlbinit_code_start: 1399 1400 ori r11,r3,MAS0_WQ_ALLWAYS 1401 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */ 1402 mtspr SPRN_MAS0,r11 1403 lis r3,(MAS1_VALID | MAS1_IPROT)@h 1404 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT 1405 mtspr SPRN_MAS1,r3 1406 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M) 1407 mtspr SPRN_MAS2,r3 1408 li r3,MAS3_SR | MAS3_SW | MAS3_SX 1409 mtspr SPRN_MAS7_MAS3,r3 1410 li r3,0 1411 mtspr SPRN_MAS8,r3 1412 1413 /* Write the TLB entry */ 1414 tlbwe 1415 1416 .globl a2_tlbinit_after_linear_map 1417a2_tlbinit_after_linear_map: 1418 1419 /* Now we branch the new virtual address mapped by this entry */ 1420 LOAD_REG_IMMEDIATE(r3,1f) 1421 mtctr r3 1422 bctr 1423 14241: /* We are now running at PAGE_OFFSET, clean the TLB of everything 1425 * else (including IPROTed things left by firmware) 1426 * r4 = TLBnCFG 1427 * r3 = current address (more or less) 1428 */ 1429 1430 li r5,0 1431 mtspr SPRN_MAS6,r5 1432 tlbsx 0,r3 1433 1434 rlwinm r9,r4,0,TLBnCFG_N_ENTRY 1435 rlwinm r10,r4,8,0xff 1436 addi r10,r10,-1 /* Get inner loop mask */ 1437 1438 li r3,1 1439 1440 mfspr r5,SPRN_MAS1 1441 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT)) 1442 1443 mfspr r6,SPRN_MAS2 1444 rldicr r6,r6,0,51 /* Extract EPN */ 1445 1446 mfspr r7,SPRN_MAS0 1447 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */ 1448 1449 rlwinm r8,r7,16,0xfff /* Extract ESEL */ 1450 14512: add r4,r3,r8 1452 and r4,r4,r10 1453 1454 rlwimi r7,r4,16,MAS0_ESEL_MASK 1455 1456 mtspr SPRN_MAS0,r7 1457 mtspr SPRN_MAS1,r5 1458 mtspr SPRN_MAS2,r6 1459 tlbwe 1460 1461 addi r3,r3,1 1462 and. r4,r3,r10 1463 1464 bne 3f 1465 addis r6,r6,(1<<30)@h 14663: 1467 cmpw r3,r9 1468 blt 2b 1469 1470 .globl a2_tlbinit_after_iprot_flush 1471a2_tlbinit_after_iprot_flush: 1472 1473 PPC_TLBILX(0,0,R0) 1474 sync 1475 isync 1476 1477 .globl a2_tlbinit_code_end 1478a2_tlbinit_code_end: 1479 1480 /* We translate LR and return */ 1481 mflr r3 1482 tovirt(r3,r3) 1483 mtlr r3 1484 blr 1485 1486/* 1487 * Main entry (boot CPU, thread 0) 1488 * 1489 * We enter here from head_64.S, possibly after the prom_init trampoline 1490 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits 1491 * mode. Anything else is as it was left by the bootloader 1492 * 1493 * Initial requirements of this port: 1494 * 1495 * - Kernel loaded at 0 physical 1496 * - A good lump of memory mapped 0:0 by UTLB entry 0 1497 * - MSR:IS & MSR:DS set to 0 1498 * 1499 * Note that some of the above requirements will be relaxed in the future 1500 * as the kernel becomes smarter at dealing with different initial conditions 1501 * but for now you have to be careful 1502 */ 1503_GLOBAL(start_initialization_book3e) 1504 mflr r28 1505 1506 /* First, we need to setup some initial TLBs to map the kernel 1507 * text, data and bss at PAGE_OFFSET. We don't have a real mode 1508 * and always use AS 0, so we just set it up to match our link 1509 * address and never use 0 based addresses. 1510 */ 1511 bl initial_tlb_book3e 1512 1513 /* Init global core bits */ 1514 bl init_core_book3e 1515 1516 /* Init per-thread bits */ 1517 bl init_thread_book3e 1518 1519 /* Return to common init code */ 1520 tovirt(r28,r28) 1521 mtlr r28 1522 blr 1523 1524 1525/* 1526 * Secondary core/processor entry 1527 * 1528 * This is entered for thread 0 of a secondary core, all other threads 1529 * are expected to be stopped. It's similar to start_initialization_book3e 1530 * except that it's generally entered from the holding loop in head_64.S 1531 * after CPUs have been gathered by Open Firmware. 1532 * 1533 * We assume we are in 32 bits mode running with whatever TLB entry was 1534 * set for us by the firmware or POR engine. 1535 */ 1536_GLOBAL(book3e_secondary_core_init_tlb_set) 1537 li r4,1 1538 b generic_secondary_smp_init 1539 1540_GLOBAL(book3e_secondary_core_init) 1541 mflr r28 1542 1543 /* Do we need to setup initial TLB entry ? */ 1544 cmplwi r4,0 1545 bne 2f 1546 1547 /* Setup TLB for this core */ 1548 bl initial_tlb_book3e 1549 1550 /* We can return from the above running at a different 1551 * address, so recalculate r2 (TOC) 1552 */ 1553 bl relative_toc 1554 1555 /* Init global core bits */ 15562: bl init_core_book3e 1557 1558 /* Init per-thread bits */ 15593: bl init_thread_book3e 1560 1561 /* Return to common init code at proper virtual address. 1562 * 1563 * Due to various previous assumptions, we know we entered this 1564 * function at either the final PAGE_OFFSET mapping or using a 1565 * 1:1 mapping at 0, so we don't bother doing a complicated check 1566 * here, we just ensure the return address has the right top bits. 1567 * 1568 * Note that if we ever want to be smarter about where we can be 1569 * started from, we have to be careful that by the time we reach 1570 * the code below we may already be running at a different location 1571 * than the one we were called from since initial_tlb_book3e can 1572 * have moved us already. 1573 */ 1574 cmpdi cr0,r28,0 1575 blt 1f 1576 lis r3,PAGE_OFFSET@highest 1577 sldi r3,r3,32 1578 or r28,r28,r3 15791: mtlr r28 1580 blr 1581 1582_GLOBAL(book3e_secondary_thread_init) 1583 mflr r28 1584 b 3b 1585 1586init_core_book3e: 1587 /* Establish the interrupt vector base */ 1588 LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e) 1589 mtspr SPRN_IVPR,r3 1590 sync 1591 blr 1592 1593init_thread_book3e: 1594 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h 1595 mtspr SPRN_EPCR,r3 1596 1597 /* Make sure interrupts are off */ 1598 wrteei 0 1599 1600 /* disable all timers and clear out status */ 1601 li r3,0 1602 mtspr SPRN_TCR,r3 1603 mfspr r3,SPRN_TSR 1604 mtspr SPRN_TSR,r3 1605 1606 blr 1607 1608_GLOBAL(__setup_base_ivors) 1609 SET_IVOR(0, 0x020) /* Critical Input */ 1610 SET_IVOR(1, 0x000) /* Machine Check */ 1611 SET_IVOR(2, 0x060) /* Data Storage */ 1612 SET_IVOR(3, 0x080) /* Instruction Storage */ 1613 SET_IVOR(4, 0x0a0) /* External Input */ 1614 SET_IVOR(5, 0x0c0) /* Alignment */ 1615 SET_IVOR(6, 0x0e0) /* Program */ 1616 SET_IVOR(7, 0x100) /* FP Unavailable */ 1617 SET_IVOR(8, 0x120) /* System Call */ 1618 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */ 1619 SET_IVOR(10, 0x160) /* Decrementer */ 1620 SET_IVOR(11, 0x180) /* Fixed Interval Timer */ 1621 SET_IVOR(12, 0x1a0) /* Watchdog Timer */ 1622 SET_IVOR(13, 0x1c0) /* Data TLB Error */ 1623 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */ 1624 SET_IVOR(15, 0x040) /* Debug */ 1625 1626 sync 1627 1628 blr 1629 1630_GLOBAL(setup_altivec_ivors) 1631 SET_IVOR(32, 0x200) /* AltiVec Unavailable */ 1632 SET_IVOR(33, 0x220) /* AltiVec Assist */ 1633 blr 1634 1635_GLOBAL(setup_perfmon_ivor) 1636 SET_IVOR(35, 0x260) /* Performance Monitor */ 1637 blr 1638 1639_GLOBAL(setup_doorbell_ivors) 1640 SET_IVOR(36, 0x280) /* Processor Doorbell */ 1641 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */ 1642 blr 1643 1644_GLOBAL(setup_ehv_ivors) 1645 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */ 1646 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */ 1647 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */ 1648 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */ 1649 blr 1650 1651_GLOBAL(setup_lrat_ivor) 1652 SET_IVOR(42, 0x340) /* LRAT Error */ 1653 blr 1654