2 * Boot code and exception vectors for Book3E processors
4 * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.
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.
12 #include <linux/threads.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/exception-64e.h>
22 #include <asm/irqflags.h>
23 #include <asm/ptrace.h>
24 #include <asm/ppc-opcode.h>
27 /* XXX This will ultimately add space for a special exception save
28 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
29 * when taking special interrupts. For now we don't support that,
30 * special interrupts from within a non-standard level will probably
33 #define SPECIAL_EXC_FRAME_SIZE INT_FRAME_SIZE
35 /* Exception prolog code for all exceptions */
36 #define EXCEPTION_PROLOG(n, type, addition) \
37 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
38 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
39 std r10,PACA_EX##type+EX_R10(r13); \
40 std r11,PACA_EX##type+EX_R11(r13); \
41 mfcr r10; /* save CR */ \
42 addition; /* additional code for that exc. */ \
43 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
44 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
45 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
46 type##_SET_KSTACK; /* get special stack if necessary */\
47 andi. r10,r11,MSR_PR; /* save stack pointer */ \
48 beq 1f; /* branch around if supervisor */ \
49 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
50 1: cmpdi cr1,r1,0; /* check if SP makes sense */ \
51 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
52 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
54 /* Exception type-specific macros */
55 #define GEN_SET_KSTACK \
56 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
57 #define SPRN_GEN_SRR0 SPRN_SRR0
58 #define SPRN_GEN_SRR1 SPRN_SRR1
60 #define CRIT_SET_KSTACK \
61 ld r1,PACA_CRIT_STACK(r13); \
62 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
63 #define SPRN_CRIT_SRR0 SPRN_CSRR0
64 #define SPRN_CRIT_SRR1 SPRN_CSRR1
66 #define DBG_SET_KSTACK \
67 ld r1,PACA_DBG_STACK(r13); \
68 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
69 #define SPRN_DBG_SRR0 SPRN_DSRR0
70 #define SPRN_DBG_SRR1 SPRN_DSRR1
72 #define MC_SET_KSTACK \
73 ld r1,PACA_MC_STACK(r13); \
74 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
75 #define SPRN_MC_SRR0 SPRN_MCSRR0
76 #define SPRN_MC_SRR1 SPRN_MCSRR1
78 #define NORMAL_EXCEPTION_PROLOG(n, addition) \
79 EXCEPTION_PROLOG(n, GEN, addition##_GEN)
81 #define CRIT_EXCEPTION_PROLOG(n, addition) \
82 EXCEPTION_PROLOG(n, CRIT, addition##_CRIT)
84 #define DBG_EXCEPTION_PROLOG(n, addition) \
85 EXCEPTION_PROLOG(n, DBG, addition##_DBG)
87 #define MC_EXCEPTION_PROLOG(n, addition) \
88 EXCEPTION_PROLOG(n, MC, addition##_MC)
91 /* Variants of the "addition" argument for the prolog
93 #define PROLOG_ADDITION_NONE_GEN
94 #define PROLOG_ADDITION_NONE_CRIT
95 #define PROLOG_ADDITION_NONE_DBG
96 #define PROLOG_ADDITION_NONE_MC
98 #define PROLOG_ADDITION_MASKABLE_GEN \
99 lbz r11,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */ \
100 cmpwi cr0,r11,0; /* yes -> go out of line */ \
101 beq masked_interrupt_book3e;
103 #define PROLOG_ADDITION_2REGS_GEN \
104 std r14,PACA_EXGEN+EX_R14(r13); \
105 std r15,PACA_EXGEN+EX_R15(r13)
107 #define PROLOG_ADDITION_1REG_GEN \
108 std r14,PACA_EXGEN+EX_R14(r13);
110 #define PROLOG_ADDITION_2REGS_CRIT \
111 std r14,PACA_EXCRIT+EX_R14(r13); \
112 std r15,PACA_EXCRIT+EX_R15(r13)
114 #define PROLOG_ADDITION_2REGS_DBG \
115 std r14,PACA_EXDBG+EX_R14(r13); \
116 std r15,PACA_EXDBG+EX_R15(r13)
118 #define PROLOG_ADDITION_2REGS_MC \
119 std r14,PACA_EXMC+EX_R14(r13); \
120 std r15,PACA_EXMC+EX_R15(r13)
122 /* Core exception code for all exceptions except TLB misses.
123 * XXX: Needs to make SPRN_SPRG_GEN depend on exception type
125 #define EXCEPTION_COMMON(n, excf, ints) \
126 std r0,GPR0(r1); /* save r0 in stackframe */ \
127 std r2,GPR2(r1); /* save r2 in stackframe */ \
128 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
129 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
130 std r9,GPR9(r1); /* save r9 in stackframe */ \
131 std r10,_NIP(r1); /* save SRR0 to stackframe */ \
132 std r11,_MSR(r1); /* save SRR1 to stackframe */ \
133 ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
134 ld r3,excf+EX_R10(r13); /* get back r10 */ \
135 ld r4,excf+EX_R11(r13); /* get back r11 */ \
136 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 */ \
137 std r12,GPR12(r1); /* save r12 in stackframe */ \
138 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
139 mflr r6; /* save LR in stackframe */ \
140 mfctr r7; /* save CTR in stackframe */ \
141 mfspr r8,SPRN_XER; /* save XER in stackframe */ \
142 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
143 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
144 lbz r11,PACASOFTIRQEN(r13); /* get current IRQ softe */ \
145 ld r12,exception_marker@toc(r2); \
147 std r3,GPR10(r1); /* save r10 to stackframe */ \
148 std r4,GPR11(r1); /* save r11 to stackframe */ \
149 std r5,GPR13(r1); /* save it to stackframe */ \
153 li r3,(n)+1; /* indicate partial regs in trap */ \
154 std r9,0(r1); /* store stack frame back link */ \
155 std r10,_CCR(r1); /* store orig CR in stackframe */ \
156 std r9,GPR1(r1); /* store stack frame back link */ \
157 std r11,SOFTE(r1); /* and save it to stackframe */ \
158 std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
159 std r3,_TRAP(r1); /* set trap number */ \
160 std r0,RESULT(r1); /* clear regs->result */ \
163 /* Variants for the "ints" argument */
165 #define INTS_DISABLE_SOFT \
166 stb r0,PACASOFTIRQEN(r13); /* mark interrupts soft-disabled */ \
168 #define INTS_DISABLE_HARD \
169 stb r0,PACAHARDIRQEN(r13); /* and hard disabled */
170 #define INTS_DISABLE_ALL \
174 /* This is called by exceptions that used INTS_KEEP (that is did not clear
175 * neither soft nor hard IRQ indicators in the PACA. This will restore MSR:EE
176 * to it's previous value
178 * XXX In the long run, we may want to open-code it in order to separate the
179 * load from the wrtee, thus limiting the latency caused by the dependency
180 * but at this point, I'll favor code clarity until we have a near to final
183 #define INTS_RESTORE_HARD \
187 /* XXX FIXME: Restore r14/r15 when necessary */
188 #define BAD_STACK_TRAMPOLINE(n) \
189 exc_##n##_bad_stack: \
190 li r1,(n); /* get exception number */ \
191 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
192 b bad_stack_book3e; /* bad stack error */
194 #define EXCEPTION_STUB(loc, label) \
195 . = interrupt_base_book3e + loc; \
196 nop; /* To make debug interrupts happy */ \
197 b exc_##label##_book3e;
207 /* Used by asynchronous interrupt that may happen in the idle loop.
209 * This check if the thread was in the idle loop, and if yes, returns
210 * to the caller rather than the PC. This is to avoid a race if
211 * interrupts happen before the wait instruction.
213 #define CHECK_NAPPING() \
214 clrrdi r11,r1,THREAD_SHIFT; \
215 ld r10,TI_LOCAL_FLAGS(r11); \
216 andi. r9,r10,_TLF_NAPPING; \
219 rlwinm r7,r10,0,~_TLF_NAPPING; \
221 std r7,TI_LOCAL_FLAGS(r11); \
225 #define MASKABLE_EXCEPTION(trapnum, label, hdlr, ack) \
226 START_EXCEPTION(label); \
227 NORMAL_EXCEPTION_PROLOG(trapnum, PROLOG_ADDITION_MASKABLE) \
228 EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE_ALL) \
231 addi r3,r1,STACK_FRAME_OVERHEAD; \
233 b .ret_from_except_lite;
235 /* This value is used to mark exception frames on the stack. */
238 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
242 * And here we have the exception vectors !
247 .globl interrupt_base_book3e
248 interrupt_base_book3e: /* fake trap */
249 /* Note: If real debug exceptions are supported by the HW, the vector
250 * below will have to be patched up to point to an appropriate handler
252 EXCEPTION_STUB(0x000, machine_check) /* 0x0200 */
253 EXCEPTION_STUB(0x020, critical_input) /* 0x0580 */
254 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
255 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
256 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
257 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
258 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
259 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
260 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
261 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
262 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
263 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
264 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
265 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
266 EXCEPTION_STUB(0x1c0, data_tlb_miss)
267 EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
268 EXCEPTION_STUB(0x280, doorbell)
269 EXCEPTION_STUB(0x2a0, doorbell_crit)
271 .globl interrupt_end_book3e
272 interrupt_end_book3e:
274 /* Critical Input Interrupt */
275 START_EXCEPTION(critical_input);
276 CRIT_EXCEPTION_PROLOG(0x100, PROLOG_ADDITION_NONE)
277 // EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE_ALL)
278 // bl special_reg_save_crit
280 // addi r3,r1,STACK_FRAME_OVERHEAD
281 // bl .critical_exception
282 // b ret_from_crit_except
285 /* Machine Check Interrupt */
286 START_EXCEPTION(machine_check);
287 CRIT_EXCEPTION_PROLOG(0x200, PROLOG_ADDITION_NONE)
288 // EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE_ALL)
289 // bl special_reg_save_mc
290 // addi r3,r1,STACK_FRAME_OVERHEAD
292 // bl .machine_check_exception
293 // b ret_from_mc_except
296 /* Data Storage Interrupt */
297 START_EXCEPTION(data_storage)
298 NORMAL_EXCEPTION_PROLOG(0x300, PROLOG_ADDITION_2REGS)
301 EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_KEEP)
302 b storage_fault_common
304 /* Instruction Storage Interrupt */
305 START_EXCEPTION(instruction_storage);
306 NORMAL_EXCEPTION_PROLOG(0x400, PROLOG_ADDITION_2REGS)
309 EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_KEEP)
310 b storage_fault_common
312 /* External Input Interrupt */
313 MASKABLE_EXCEPTION(0x500, external_input, .do_IRQ, ACK_NONE)
316 START_EXCEPTION(alignment);
317 NORMAL_EXCEPTION_PROLOG(0x600, PROLOG_ADDITION_2REGS)
320 EXCEPTION_COMMON(0x600, PACA_EXGEN, INTS_KEEP)
321 b alignment_more /* no room, go out of line */
323 /* Program Interrupt */
324 START_EXCEPTION(program);
325 NORMAL_EXCEPTION_PROLOG(0x700, PROLOG_ADDITION_1REG)
327 EXCEPTION_COMMON(0x700, PACA_EXGEN, INTS_DISABLE_SOFT)
329 addi r3,r1,STACK_FRAME_OVERHEAD
330 ld r14,PACA_EXGEN+EX_R14(r13)
333 bl .program_check_exception
336 /* Floating Point Unavailable Interrupt */
337 START_EXCEPTION(fp_unavailable);
338 NORMAL_EXCEPTION_PROLOG(0x800, PROLOG_ADDITION_NONE)
339 /* we can probably do a shorter exception entry for that one... */
340 EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP)
341 bne 1f /* if from user, just load it up */
343 addi r3,r1,STACK_FRAME_OVERHEAD
345 bl .kernel_fp_unavailable_exception
349 b fast_exception_return
351 /* Decrementer Interrupt */
352 MASKABLE_EXCEPTION(0x900, decrementer, .timer_interrupt, ACK_DEC)
354 /* Fixed Interval Timer Interrupt */
355 MASKABLE_EXCEPTION(0x980, fixed_interval, .unknown_exception, ACK_FIT)
357 /* Watchdog Timer Interrupt */
358 START_EXCEPTION(watchdog);
359 CRIT_EXCEPTION_PROLOG(0x9f0, PROLOG_ADDITION_NONE)
360 // EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE_ALL)
361 // bl special_reg_save_crit
363 // addi r3,r1,STACK_FRAME_OVERHEAD
364 // bl .unknown_exception
365 // b ret_from_crit_except
368 /* System Call Interrupt */
369 START_EXCEPTION(system_call)
370 mr r9,r13 /* keep a copy of userland r13 */
371 mfspr r11,SPRN_SRR0 /* get return address */
372 mfspr r12,SPRN_SRR1 /* get previous MSR */
373 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
376 /* Auxillary Processor Unavailable Interrupt */
377 START_EXCEPTION(ap_unavailable);
378 NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE)
379 EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_KEEP)
380 addi r3,r1,STACK_FRAME_OVERHEAD
383 bl .unknown_exception
386 /* Debug exception as a critical interrupt*/
387 START_EXCEPTION(debug_crit);
388 CRIT_EXCEPTION_PROLOG(0xd00, PROLOG_ADDITION_2REGS)
391 * If there is a single step or branch-taken exception in an
392 * exception entry sequence, it was probably meant to apply to
393 * the code where the exception occurred (since exception entry
394 * doesn't turn off DE automatically). We simulate the effect
395 * of turning off DE on entry to an exception handler by turning
396 * off DE in the CSRR1 value and clearing the debug status.
399 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
400 andis. r15,r14,DBSR_IC@h
403 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
404 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
410 /* here it looks like we got an inappropriate debug exception. */
411 lis r14,DBSR_IC@h /* clear the IC event */
412 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
415 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
416 ld r1,PACA_EXCRIT+EX_R1(r13)
417 ld r14,PACA_EXCRIT+EX_R14(r13)
418 ld r15,PACA_EXCRIT+EX_R15(r13)
420 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
421 ld r11,PACA_EXCRIT+EX_R11(r13)
422 mfspr r13,SPRN_SPRG_CRIT_SCRATCH
425 /* Normal debug exception */
426 /* XXX We only handle coming from userspace for now since we can't
427 * quite save properly an interrupted kernel state yet
429 1: andi. r14,r11,MSR_PR; /* check for userspace again */
430 beq kernel_dbg_exc; /* if from kernel mode */
432 /* Now we mash up things to make it look like we are coming on a
435 mfspr r15,SPRN_SPRG_CRIT_SCRATCH
436 mtspr SPRN_SPRG_GEN_SCRATCH,r15
438 EXCEPTION_COMMON(0xd00, PACA_EXCRIT, INTS_DISABLE_ALL)
440 addi r3,r1,STACK_FRAME_OVERHEAD
442 ld r14,PACA_EXCRIT+EX_R14(r13)
443 ld r15,PACA_EXCRIT+EX_R15(r13)
451 /* Doorbell interrupt */
452 MASKABLE_EXCEPTION(0x2070, doorbell, .doorbell_exception, ACK_NONE)
454 /* Doorbell critical Interrupt */
455 START_EXCEPTION(doorbell_crit);
456 CRIT_EXCEPTION_PROLOG(0x2080, PROLOG_ADDITION_NONE)
457 // EXCEPTION_COMMON(0x2080, PACA_EXCRIT, INTS_DISABLE_ALL)
458 // bl special_reg_save_crit
460 // addi r3,r1,STACK_FRAME_OVERHEAD
461 // bl .doorbell_critical_exception
462 // b ret_from_crit_except
467 * An interrupt came in while soft-disabled; clear EE in SRR1,
468 * clear paca->hard_enabled and return.
470 masked_interrupt_book3e:
472 stb r11,PACAHARDIRQEN(r13)
474 rldicl r11,r10,48,1 /* clear MSR_EE */
477 ld r10,PACA_EXGEN+EX_R10(r13); /* restore registers */
478 ld r11,PACA_EXGEN+EX_R11(r13);
479 mfspr r13,SPRN_SPRG_GEN_SCRATCH;
484 * This is called from 0x300 and 0x400 handlers after the prologs with
485 * r14 and r15 containing the fault address and error code, with the
486 * original values stashed away in the PACA
488 storage_fault_common:
491 addi r3,r1,STACK_FRAME_OVERHEAD
494 ld r14,PACA_EXGEN+EX_R14(r13)
495 ld r15,PACA_EXGEN+EX_R15(r13)
500 b .ret_from_except_lite
503 addi r3,r1,STACK_FRAME_OVERHEAD
509 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
515 addi r3,r1,STACK_FRAME_OVERHEAD
516 ld r14,PACA_EXGEN+EX_R14(r13)
517 ld r15,PACA_EXGEN+EX_R15(r13)
520 bl .alignment_exception
524 * We branch here from entry_64.S for the last stage of the exception
525 * return code path. MSR:EE is expected to be off at that point
527 _GLOBAL(exception_return_book3e)
530 /* This is the return from load_up_fpu fast path which could do with
531 * less GPR restores in fact, but for now we have a single return path
533 .globl fast_exception_return
534 fast_exception_return:
542 ACCOUNT_CPU_USER_EXIT(r10, r11)
545 1: stdcx. r0,0,r1 /* to clear the reservation */
559 mtspr SPRN_SPRG_GEN_SCRATCH,r0
561 std r10,PACA_EXGEN+EX_R10(r13);
562 std r11,PACA_EXGEN+EX_R11(r13);
569 ld r10,PACA_EXGEN+EX_R10(r13)
570 ld r11,PACA_EXGEN+EX_R11(r13)
571 mfspr r13,SPRN_SPRG_GEN_SCRATCH
575 * Trampolines used when spotting a bad kernel stack pointer in
576 * the exception entry code.
578 * TODO: move some bits like SRR0 read to trampoline, pass PACA
579 * index around, etc... to handle crit & mcheck
581 BAD_STACK_TRAMPOLINE(0x000)
582 BAD_STACK_TRAMPOLINE(0x100)
583 BAD_STACK_TRAMPOLINE(0x200)
584 BAD_STACK_TRAMPOLINE(0x300)
585 BAD_STACK_TRAMPOLINE(0x400)
586 BAD_STACK_TRAMPOLINE(0x500)
587 BAD_STACK_TRAMPOLINE(0x600)
588 BAD_STACK_TRAMPOLINE(0x700)
589 BAD_STACK_TRAMPOLINE(0x800)
590 BAD_STACK_TRAMPOLINE(0x900)
591 BAD_STACK_TRAMPOLINE(0x980)
592 BAD_STACK_TRAMPOLINE(0x9f0)
593 BAD_STACK_TRAMPOLINE(0xa00)
594 BAD_STACK_TRAMPOLINE(0xb00)
595 BAD_STACK_TRAMPOLINE(0xc00)
596 BAD_STACK_TRAMPOLINE(0xd00)
597 BAD_STACK_TRAMPOLINE(0xe00)
598 BAD_STACK_TRAMPOLINE(0xf00)
599 BAD_STACK_TRAMPOLINE(0xf20)
600 BAD_STACK_TRAMPOLINE(0x2070)
601 BAD_STACK_TRAMPOLINE(0x2080)
603 .globl bad_stack_book3e
605 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
606 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
607 ld r1,PACAEMERGSP(r13)
608 subi r1,r1,64+INT_FRAME_SIZE
611 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
612 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
619 std r0,GPR0(r1); /* save r0 in stackframe */ \
620 std r2,GPR2(r1); /* save r2 in stackframe */ \
621 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
622 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
623 std r9,GPR9(r1); /* save r9 in stackframe */ \
624 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
625 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
626 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
627 std r3,GPR10(r1); /* save r10 to stackframe */ \
628 std r4,GPR11(r1); /* save r11 to stackframe */ \
629 std r12,GPR12(r1); /* save r12 in stackframe */ \
630 std r5,GPR13(r1); /* save it to stackframe */ \
639 lhz r12,PACA_TRAP_SAVE(r13)
641 addi r11,r1,INT_FRAME_SIZE
646 1: addi r3,r1,STACK_FRAME_OVERHEAD
651 * Setup the initial TLB for a core. This current implementation
652 * assume that whatever we are running off will not conflict with
653 * the new mapping at PAGE_OFFSET.
655 _GLOBAL(initial_tlb_book3e)
657 /* Look for the first TLB with IPROT set */
658 mfspr r4,SPRN_TLB0CFG
659 andi. r3,r4,TLBnCFG_IPROT
660 lis r3,MAS0_TLBSEL(0)@h
663 mfspr r4,SPRN_TLB1CFG
664 andi. r3,r4,TLBnCFG_IPROT
665 lis r3,MAS0_TLBSEL(1)@h
668 mfspr r4,SPRN_TLB2CFG
669 andi. r3,r4,TLBnCFG_IPROT
670 lis r3,MAS0_TLBSEL(2)@h
673 lis r3,MAS0_TLBSEL(3)@h
674 mfspr r4,SPRN_TLB3CFG
678 andi. r5,r4,TLBnCFG_HES
681 mflr r8 /* save LR */
682 /* 1. Find the index of the entry we're executing in
684 * r3 = MAS0_TLBSEL (for the iprot array)
687 bl invstr /* Find our address */
688 invstr: mflr r6 /* Make it accessible */
690 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
695 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
698 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
700 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
701 oris r7,r7,MAS1_IPROT@h
705 /* 2. Invalidate all entries except the entry we're executing in
707 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
709 * r5 = ESEL of entry we are running in
711 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
712 li r6,0 /* Set Entry counter to 0 */
713 1: mr r7,r3 /* Set MAS0(TLBSEL) */
714 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
718 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
720 beq skpinv /* Dont update the current execution TLB */
724 skpinv: addi r6,r6,1 /* Increment */
725 cmpw r6,r4 /* Are we done? */
726 bne 1b /* If not, repeat */
728 /* Invalidate all TLBs */
733 /* 3. Setup a temp mapping and jump to it
735 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
736 * r5 = ESEL of entry we are running in
738 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
740 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
744 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
748 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
756 bl 1f /* Find our address */
763 /* 4. Clear out PIDs & Search info
765 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
766 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
773 /* 5. Invalidate mapping we started in
775 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
776 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
782 rlwinm r6,r6,0,2,0 /* clear IPROT */
786 /* Invalidate TLB1 */
791 /* The mapping only needs to be cache-coherent on SMP */
793 #define M_IF_SMP MAS2_M
798 /* 6. Setup KERNELBASE mapping in TLB[0]
800 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
801 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
804 rlwinm r3,r3,0,16,3 /* clear ESEL */
806 lis r6,(MAS1_VALID|MAS1_IPROT)@h
807 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
810 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_SMP)
814 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
821 /* 7. Jump to KERNELBASE mapping
823 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
825 /* Now we branch the new virtual address mapped by this entry */
826 LOAD_REG_IMMEDIATE(r6,2f)
828 ori r7,r7,MSR_KERNEL@l
831 rfi /* start execution out of TLB1[0] entry */
834 /* 8. Clear out the temp mapping
836 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
841 rlwinm r5,r5,0,2,0 /* clear IPROT */
845 /* Invalidate TLB1 */
850 /* We translate LR and return */
856 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
857 * kernel linear mapping. We also set MAS8 once for all here though
858 * that will have to be made dependent on whether we are running under
859 * a hypervisor I suppose.
861 ori r3,r3,MAS0_HES | MAS0_WQ_ALLWAYS
863 lis r3,(MAS1_VALID | MAS1_IPROT)@h
864 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
866 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
868 li r3,MAS3_SR | MAS3_SW | MAS3_SX
869 mtspr SPRN_MAS7_MAS3,r3
873 /* Write the TLB entry */
876 /* Now we branch the new virtual address mapped by this entry */
877 LOAD_REG_IMMEDIATE(r3,1f)
881 1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
882 * else (XXX we should scan for bolted crap from the firmware too)
888 /* We translate LR and return */
895 * Main entry (boot CPU, thread 0)
897 * We enter here from head_64.S, possibly after the prom_init trampoline
898 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
899 * mode. Anything else is as it was left by the bootloader
901 * Initial requirements of this port:
903 * - Kernel loaded at 0 physical
904 * - A good lump of memory mapped 0:0 by UTLB entry 0
905 * - MSR:IS & MSR:DS set to 0
907 * Note that some of the above requirements will be relaxed in the future
908 * as the kernel becomes smarter at dealing with different initial conditions
909 * but for now you have to be careful
911 _GLOBAL(start_initialization_book3e)
914 /* First, we need to setup some initial TLBs to map the kernel
915 * text, data and bss at PAGE_OFFSET. We don't have a real mode
916 * and always use AS 0, so we just set it up to match our link
917 * address and never use 0 based addresses.
919 bl .initial_tlb_book3e
921 /* Init global core bits */
924 /* Init per-thread bits */
925 bl .init_thread_book3e
927 /* Return to common init code */
934 * Secondary core/processor entry
936 * This is entered for thread 0 of a secondary core, all other threads
937 * are expected to be stopped. It's similar to start_initialization_book3e
938 * except that it's generally entered from the holding loop in head_64.S
939 * after CPUs have been gathered by Open Firmware.
941 * We assume we are in 32 bits mode running with whatever TLB entry was
942 * set for us by the firmware or POR engine.
944 _GLOBAL(book3e_secondary_core_init_tlb_set)
946 b .generic_secondary_smp_init
948 _GLOBAL(book3e_secondary_core_init)
951 /* Do we need to setup initial TLB entry ? */
955 /* Setup TLB for this core */
956 bl .initial_tlb_book3e
958 /* We can return from the above running at a different
959 * address, so recalculate r2 (TOC)
963 /* Init global core bits */
964 2: bl .init_core_book3e
966 /* Init per-thread bits */
967 3: bl .init_thread_book3e
969 /* Return to common init code at proper virtual address.
971 * Due to various previous assumptions, we know we entered this
972 * function at either the final PAGE_OFFSET mapping or using a
973 * 1:1 mapping at 0, so we don't bother doing a complicated check
974 * here, we just ensure the return address has the right top bits.
976 * Note that if we ever want to be smarter about where we can be
977 * started from, we have to be careful that by the time we reach
978 * the code below we may already be running at a different location
979 * than the one we were called from since initial_tlb_book3e can
980 * have moved us already.
984 lis r3,PAGE_OFFSET@highest
990 _GLOBAL(book3e_secondary_thread_init)
994 _STATIC(init_core_book3e)
995 /* Establish the interrupt vector base */
996 LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
1001 _STATIC(init_thread_book3e)
1002 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
1005 /* Make sure interrupts are off */
1008 /* disable all timers and clear out status */
1016 _GLOBAL(__setup_base_ivors)
1017 SET_IVOR(0, 0x020) /* Critical Input */
1018 SET_IVOR(1, 0x000) /* Machine Check */
1019 SET_IVOR(2, 0x060) /* Data Storage */
1020 SET_IVOR(3, 0x080) /* Instruction Storage */
1021 SET_IVOR(4, 0x0a0) /* External Input */
1022 SET_IVOR(5, 0x0c0) /* Alignment */
1023 SET_IVOR(6, 0x0e0) /* Program */
1024 SET_IVOR(7, 0x100) /* FP Unavailable */
1025 SET_IVOR(8, 0x120) /* System Call */
1026 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1027 SET_IVOR(10, 0x160) /* Decrementer */
1028 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1029 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1030 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1031 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1032 SET_IVOR(15, 0x040) /* Debug */