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/reg_a2.h>
21 #include <asm/exception-64e.h>
23 #include <asm/irqflags.h>
24 #include <asm/ptrace.h>
25 #include <asm/ppc-opcode.h>
27 #include <asm/hw_irq.h>
29 /* XXX This will ultimately add space for a special exception save
30 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
31 * when taking special interrupts. For now we don't support that,
32 * special interrupts from within a non-standard level will probably
35 #define SPECIAL_EXC_FRAME_SIZE INT_FRAME_SIZE
37 /* Exception prolog code for all exceptions */
38 #define EXCEPTION_PROLOG(n, type, addition) \
39 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
40 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
41 std r10,PACA_EX##type+EX_R10(r13); \
42 std r11,PACA_EX##type+EX_R11(r13); \
43 mfcr r10; /* save CR */ \
44 addition; /* additional code for that exc. */ \
45 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
46 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
47 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
48 type##_SET_KSTACK; /* get special stack if necessary */\
49 andi. r10,r11,MSR_PR; /* save stack pointer */ \
50 beq 1f; /* branch around if supervisor */ \
51 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
52 1: cmpdi cr1,r1,0; /* check if SP makes sense */ \
53 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
54 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
56 /* Exception type-specific macros */
57 #define GEN_SET_KSTACK \
58 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
59 #define SPRN_GEN_SRR0 SPRN_SRR0
60 #define SPRN_GEN_SRR1 SPRN_SRR1
62 #define GDBELL_SET_KSTACK GEN_SET_KSTACK
63 #define SPRN_GDBELL_SRR0 SPRN_GSRR0
64 #define SPRN_GDBELL_SRR1 SPRN_GSRR1
66 #define CRIT_SET_KSTACK \
67 ld r1,PACA_CRIT_STACK(r13); \
68 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
69 #define SPRN_CRIT_SRR0 SPRN_CSRR0
70 #define SPRN_CRIT_SRR1 SPRN_CSRR1
72 #define DBG_SET_KSTACK \
73 ld r1,PACA_DBG_STACK(r13); \
74 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
75 #define SPRN_DBG_SRR0 SPRN_DSRR0
76 #define SPRN_DBG_SRR1 SPRN_DSRR1
78 #define MC_SET_KSTACK \
79 ld r1,PACA_MC_STACK(r13); \
80 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
81 #define SPRN_MC_SRR0 SPRN_MCSRR0
82 #define SPRN_MC_SRR1 SPRN_MCSRR1
84 #define NORMAL_EXCEPTION_PROLOG(n, addition) \
85 EXCEPTION_PROLOG(n, GEN, addition##_GEN(n))
87 #define CRIT_EXCEPTION_PROLOG(n, addition) \
88 EXCEPTION_PROLOG(n, CRIT, addition##_CRIT(n))
90 #define DBG_EXCEPTION_PROLOG(n, addition) \
91 EXCEPTION_PROLOG(n, DBG, addition##_DBG(n))
93 #define MC_EXCEPTION_PROLOG(n, addition) \
94 EXCEPTION_PROLOG(n, MC, addition##_MC(n))
96 #define GDBELL_EXCEPTION_PROLOG(n, addition) \
97 EXCEPTION_PROLOG(n, GDBELL, addition##_GDBELL(n))
99 /* Variants of the "addition" argument for the prolog
101 #define PROLOG_ADDITION_NONE_GEN(n)
102 #define PROLOG_ADDITION_NONE_GDBELL(n)
103 #define PROLOG_ADDITION_NONE_CRIT(n)
104 #define PROLOG_ADDITION_NONE_DBG(n)
105 #define PROLOG_ADDITION_NONE_MC(n)
107 #define PROLOG_ADDITION_MASKABLE_GEN(n) \
108 lbz r11,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */ \
109 cmpwi cr0,r11,0; /* yes -> go out of line */ \
110 beq masked_interrupt_book3e_##n
112 #define PROLOG_ADDITION_2REGS_GEN(n) \
113 std r14,PACA_EXGEN+EX_R14(r13); \
114 std r15,PACA_EXGEN+EX_R15(r13)
116 #define PROLOG_ADDITION_1REG_GEN(n) \
117 std r14,PACA_EXGEN+EX_R14(r13);
119 #define PROLOG_ADDITION_2REGS_CRIT(n) \
120 std r14,PACA_EXCRIT+EX_R14(r13); \
121 std r15,PACA_EXCRIT+EX_R15(r13)
123 #define PROLOG_ADDITION_2REGS_DBG(n) \
124 std r14,PACA_EXDBG+EX_R14(r13); \
125 std r15,PACA_EXDBG+EX_R15(r13)
127 #define PROLOG_ADDITION_2REGS_MC(n) \
128 std r14,PACA_EXMC+EX_R14(r13); \
129 std r15,PACA_EXMC+EX_R15(r13)
132 /* Core exception code for all exceptions except TLB misses.
133 * XXX: Needs to make SPRN_SPRG_GEN depend on exception type
135 #define EXCEPTION_COMMON(n, excf, ints) \
137 std r0,GPR0(r1); /* save r0 in stackframe */ \
138 std r2,GPR2(r1); /* save r2 in stackframe */ \
139 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
140 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
141 std r9,GPR9(r1); /* save r9 in stackframe */ \
142 std r10,_NIP(r1); /* save SRR0 to stackframe */ \
143 std r11,_MSR(r1); /* save SRR1 to stackframe */ \
144 ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
145 ld r3,excf+EX_R10(r13); /* get back r10 */ \
146 ld r4,excf+EX_R11(r13); /* get back r11 */ \
147 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 */ \
148 std r12,GPR12(r1); /* save r12 in stackframe */ \
149 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
150 mflr r6; /* save LR in stackframe */ \
151 mfctr r7; /* save CTR in stackframe */ \
152 mfspr r8,SPRN_XER; /* save XER in stackframe */ \
153 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
154 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
155 lbz r11,PACASOFTIRQEN(r13); /* get current IRQ softe */ \
156 ld r12,exception_marker@toc(r2); \
158 std r3,GPR10(r1); /* save r10 to stackframe */ \
159 std r4,GPR11(r1); /* save r11 to stackframe */ \
160 std r5,GPR13(r1); /* save it to stackframe */ \
164 li r3,(n)+1; /* indicate partial regs in trap */ \
165 std r9,0(r1); /* store stack frame back link */ \
166 std r10,_CCR(r1); /* store orig CR in stackframe */ \
167 std r9,GPR1(r1); /* store stack frame back link */ \
168 std r11,SOFTE(r1); /* and save it to stackframe */ \
169 std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
170 std r3,_TRAP(r1); /* set trap number */ \
171 std r0,RESULT(r1); /* clear regs->result */ \
174 /* Variants for the "ints" argument. This one does nothing when we want
175 * to keep interrupts in their original state
179 /* This second version is meant for exceptions that don't immediately
180 * hard-enable. We set a bit in paca->irq_happened to ensure that
181 * a subsequent call to arch_local_irq_restore() will properly
182 * hard-enable and avoid the fast-path
184 #define INTS_DISABLE SOFT_DISABLE_INTS(r3,r4)
186 /* This is called by exceptions that used INTS_KEEP (that did not touch
187 * irq indicators in the PACA). This will restore MSR:EE to it's previous
190 * XXX In the long run, we may want to open-code it in order to separate the
191 * load from the wrtee, thus limiting the latency caused by the dependency
192 * but at this point, I'll favor code clarity until we have a near to final
195 #define INTS_RESTORE_HARD \
199 /* XXX FIXME: Restore r14/r15 when necessary */
200 #define BAD_STACK_TRAMPOLINE(n) \
201 exc_##n##_bad_stack: \
202 li r1,(n); /* get exception number */ \
203 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
204 b bad_stack_book3e; /* bad stack error */
206 /* WARNING: If you change the layout of this stub, make sure you chcek
207 * the debug exception handler which handles single stepping
208 * into exceptions from userspace, and the MM code in
209 * arch/powerpc/mm/tlb_nohash.c which patches the branch here
210 * and would need to be updated if that branch is moved
212 #define EXCEPTION_STUB(loc, label) \
213 . = interrupt_base_book3e + loc; \
214 nop; /* To make debug interrupts happy */ \
215 b exc_##label##_book3e;
225 /* Used by asynchronous interrupt that may happen in the idle loop.
227 * This check if the thread was in the idle loop, and if yes, returns
228 * to the caller rather than the PC. This is to avoid a race if
229 * interrupts happen before the wait instruction.
231 #define CHECK_NAPPING() \
232 CURRENT_THREAD_INFO(r11, r1); \
233 ld r10,TI_LOCAL_FLAGS(r11); \
234 andi. r9,r10,_TLF_NAPPING; \
237 rlwinm r7,r10,0,~_TLF_NAPPING; \
239 std r7,TI_LOCAL_FLAGS(r11); \
243 #define MASKABLE_EXCEPTION(trapnum, label, hdlr, ack) \
244 START_EXCEPTION(label); \
245 NORMAL_EXCEPTION_PROLOG(trapnum, PROLOG_ADDITION_MASKABLE) \
246 EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE) \
249 addi r3,r1,STACK_FRAME_OVERHEAD; \
251 b .ret_from_except_lite;
253 /* This value is used to mark exception frames on the stack. */
256 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
260 * And here we have the exception vectors !
265 .globl interrupt_base_book3e
266 interrupt_base_book3e: /* fake trap */
267 EXCEPTION_STUB(0x000, machine_check) /* 0x0200 */
268 EXCEPTION_STUB(0x020, critical_input) /* 0x0580 */
269 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
270 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
271 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
272 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
273 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
274 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
275 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
276 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
277 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
278 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
279 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
280 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
281 EXCEPTION_STUB(0x1c0, data_tlb_miss)
282 EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
283 EXCEPTION_STUB(0x260, perfmon)
284 EXCEPTION_STUB(0x280, doorbell)
285 EXCEPTION_STUB(0x2a0, doorbell_crit)
286 EXCEPTION_STUB(0x2c0, guest_doorbell)
287 EXCEPTION_STUB(0x2e0, guest_doorbell_crit)
288 EXCEPTION_STUB(0x300, hypercall)
289 EXCEPTION_STUB(0x320, ehpriv)
291 .globl interrupt_end_book3e
292 interrupt_end_book3e:
294 /* Critical Input Interrupt */
295 START_EXCEPTION(critical_input);
296 CRIT_EXCEPTION_PROLOG(0x100, PROLOG_ADDITION_NONE)
297 // EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE)
298 // bl special_reg_save_crit
300 // addi r3,r1,STACK_FRAME_OVERHEAD
301 // bl .critical_exception
302 // b ret_from_crit_except
305 /* Machine Check Interrupt */
306 START_EXCEPTION(machine_check);
307 MC_EXCEPTION_PROLOG(0x200, PROLOG_ADDITION_NONE)
308 // EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE)
309 // bl special_reg_save_mc
310 // addi r3,r1,STACK_FRAME_OVERHEAD
312 // bl .machine_check_exception
313 // b ret_from_mc_except
316 /* Data Storage Interrupt */
317 START_EXCEPTION(data_storage)
318 NORMAL_EXCEPTION_PROLOG(0x300, PROLOG_ADDITION_2REGS)
321 EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_DISABLE)
322 b storage_fault_common
324 /* Instruction Storage Interrupt */
325 START_EXCEPTION(instruction_storage);
326 NORMAL_EXCEPTION_PROLOG(0x400, PROLOG_ADDITION_2REGS)
329 EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_DISABLE)
330 b storage_fault_common
332 /* External Input Interrupt */
333 MASKABLE_EXCEPTION(0x500, external_input, .do_IRQ, ACK_NONE)
336 START_EXCEPTION(alignment);
337 NORMAL_EXCEPTION_PROLOG(0x600, PROLOG_ADDITION_2REGS)
340 EXCEPTION_COMMON(0x600, PACA_EXGEN, INTS_KEEP)
341 b alignment_more /* no room, go out of line */
343 /* Program Interrupt */
344 START_EXCEPTION(program);
345 NORMAL_EXCEPTION_PROLOG(0x700, PROLOG_ADDITION_1REG)
347 EXCEPTION_COMMON(0x700, PACA_EXGEN, INTS_DISABLE)
349 addi r3,r1,STACK_FRAME_OVERHEAD
350 ld r14,PACA_EXGEN+EX_R14(r13)
352 bl .program_check_exception
355 /* Floating Point Unavailable Interrupt */
356 START_EXCEPTION(fp_unavailable);
357 NORMAL_EXCEPTION_PROLOG(0x800, PROLOG_ADDITION_NONE)
358 /* we can probably do a shorter exception entry for that one... */
359 EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP)
364 b fast_exception_return
367 addi r3,r1,STACK_FRAME_OVERHEAD
368 bl .kernel_fp_unavailable_exception
371 /* Decrementer Interrupt */
372 MASKABLE_EXCEPTION(0x900, decrementer, .timer_interrupt, ACK_DEC)
374 /* Fixed Interval Timer Interrupt */
375 MASKABLE_EXCEPTION(0x980, fixed_interval, .unknown_exception, ACK_FIT)
377 /* Watchdog Timer Interrupt */
378 START_EXCEPTION(watchdog);
379 CRIT_EXCEPTION_PROLOG(0x9f0, PROLOG_ADDITION_NONE)
380 // EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE)
381 // bl special_reg_save_crit
383 // addi r3,r1,STACK_FRAME_OVERHEAD
384 // bl .unknown_exception
385 // b ret_from_crit_except
388 /* System Call Interrupt */
389 START_EXCEPTION(system_call)
390 mr r9,r13 /* keep a copy of userland r13 */
391 mfspr r11,SPRN_SRR0 /* get return address */
392 mfspr r12,SPRN_SRR1 /* get previous MSR */
393 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
396 /* Auxiliary Processor Unavailable Interrupt */
397 START_EXCEPTION(ap_unavailable);
398 NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE)
399 EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_DISABLE)
401 addi r3,r1,STACK_FRAME_OVERHEAD
402 bl .unknown_exception
405 /* Debug exception as a critical interrupt*/
406 START_EXCEPTION(debug_crit);
407 CRIT_EXCEPTION_PROLOG(0xd00, PROLOG_ADDITION_2REGS)
410 * If there is a single step or branch-taken exception in an
411 * exception entry sequence, it was probably meant to apply to
412 * the code where the exception occurred (since exception entry
413 * doesn't turn off DE automatically). We simulate the effect
414 * of turning off DE on entry to an exception handler by turning
415 * off DE in the CSRR1 value and clearing the debug status.
418 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
419 andis. r15,r14,DBSR_IC@h
422 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
423 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
429 /* here it looks like we got an inappropriate debug exception. */
430 lis r14,DBSR_IC@h /* clear the IC event */
431 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
434 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
435 ld r1,PACA_EXCRIT+EX_R1(r13)
436 ld r14,PACA_EXCRIT+EX_R14(r13)
437 ld r15,PACA_EXCRIT+EX_R15(r13)
439 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
440 ld r11,PACA_EXCRIT+EX_R11(r13)
441 mfspr r13,SPRN_SPRG_CRIT_SCRATCH
444 /* Normal debug exception */
445 /* XXX We only handle coming from userspace for now since we can't
446 * quite save properly an interrupted kernel state yet
448 1: andi. r14,r11,MSR_PR; /* check for userspace again */
449 beq kernel_dbg_exc; /* if from kernel mode */
451 /* Now we mash up things to make it look like we are coming on a
454 mfspr r15,SPRN_SPRG_CRIT_SCRATCH
455 mtspr SPRN_SPRG_GEN_SCRATCH,r15
457 EXCEPTION_COMMON(0xd00, PACA_EXCRIT, INTS_DISABLE)
459 addi r3,r1,STACK_FRAME_OVERHEAD
461 ld r14,PACA_EXCRIT+EX_R14(r13)
462 ld r15,PACA_EXCRIT+EX_R15(r13)
470 /* Debug exception as a debug interrupt*/
471 START_EXCEPTION(debug_debug);
472 DBG_EXCEPTION_PROLOG(0xd08, PROLOG_ADDITION_2REGS)
475 * If there is a single step or branch-taken exception in an
476 * exception entry sequence, it was probably meant to apply to
477 * the code where the exception occurred (since exception entry
478 * doesn't turn off DE automatically). We simulate the effect
479 * of turning off DE on entry to an exception handler by turning
480 * off DE in the DSRR1 value and clearing the debug status.
483 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
484 andis. r15,r14,DBSR_IC@h
487 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
488 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
494 /* here it looks like we got an inappropriate debug exception. */
495 lis r14,DBSR_IC@h /* clear the IC event */
496 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
499 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */
500 ld r1,PACA_EXDBG+EX_R1(r13)
501 ld r14,PACA_EXDBG+EX_R14(r13)
502 ld r15,PACA_EXDBG+EX_R15(r13)
504 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */
505 ld r11,PACA_EXDBG+EX_R11(r13)
506 mfspr r13,SPRN_SPRG_DBG_SCRATCH
509 /* Normal debug exception */
510 /* XXX We only handle coming from userspace for now since we can't
511 * quite save properly an interrupted kernel state yet
513 1: andi. r14,r11,MSR_PR; /* check for userspace again */
514 beq kernel_dbg_exc; /* if from kernel mode */
516 /* Now we mash up things to make it look like we are coming on a
519 mfspr r15,SPRN_SPRG_DBG_SCRATCH
520 mtspr SPRN_SPRG_GEN_SCRATCH,r15
522 EXCEPTION_COMMON(0xd08, PACA_EXDBG, INTS_DISABLE)
524 addi r3,r1,STACK_FRAME_OVERHEAD
526 ld r14,PACA_EXDBG+EX_R14(r13)
527 ld r15,PACA_EXDBG+EX_R15(r13)
532 START_EXCEPTION(perfmon);
533 NORMAL_EXCEPTION_PROLOG(0x260, PROLOG_ADDITION_NONE)
534 EXCEPTION_COMMON(0x260, PACA_EXGEN, INTS_DISABLE)
535 addi r3,r1,STACK_FRAME_OVERHEAD
536 bl .performance_monitor_exception
537 b .ret_from_except_lite
539 /* Doorbell interrupt */
540 MASKABLE_EXCEPTION(0x280, doorbell, .doorbell_exception, ACK_NONE)
542 /* Doorbell critical Interrupt */
543 START_EXCEPTION(doorbell_crit);
544 CRIT_EXCEPTION_PROLOG(0x2a0, PROLOG_ADDITION_NONE)
545 // EXCEPTION_COMMON(0x2a0, PACA_EXCRIT, INTS_DISABLE)
546 // bl special_reg_save_crit
548 // addi r3,r1,STACK_FRAME_OVERHEAD
549 // bl .doorbell_critical_exception
550 // b ret_from_crit_except
554 * Guest doorbell interrupt
555 * This general exception use GSRRx save/restore registers
557 START_EXCEPTION(guest_doorbell);
558 GDBELL_EXCEPTION_PROLOG(0x2c0, PROLOG_ADDITION_NONE)
559 EXCEPTION_COMMON(0x2c0, PACA_EXGEN, INTS_KEEP)
560 addi r3,r1,STACK_FRAME_OVERHEAD
563 bl .unknown_exception
566 /* Guest Doorbell critical Interrupt */
567 START_EXCEPTION(guest_doorbell_crit);
568 CRIT_EXCEPTION_PROLOG(0x2e0, PROLOG_ADDITION_NONE)
569 // EXCEPTION_COMMON(0x2e0, PACA_EXCRIT, INTS_DISABLE)
570 // bl special_reg_save_crit
572 // addi r3,r1,STACK_FRAME_OVERHEAD
573 // bl .guest_doorbell_critical_exception
574 // b ret_from_crit_except
577 /* Hypervisor call */
578 START_EXCEPTION(hypercall);
579 NORMAL_EXCEPTION_PROLOG(0x310, PROLOG_ADDITION_NONE)
580 EXCEPTION_COMMON(0x310, PACA_EXGEN, INTS_KEEP)
581 addi r3,r1,STACK_FRAME_OVERHEAD
584 bl .unknown_exception
587 /* Embedded Hypervisor priviledged */
588 START_EXCEPTION(ehpriv);
589 NORMAL_EXCEPTION_PROLOG(0x320, PROLOG_ADDITION_NONE)
590 EXCEPTION_COMMON(0x320, PACA_EXGEN, INTS_KEEP)
591 addi r3,r1,STACK_FRAME_OVERHEAD
594 bl .unknown_exception
598 * An interrupt came in while soft-disabled; We mark paca->irq_happened
599 * accordingly and if the interrupt is level sensitive, we hard disable
602 masked_interrupt_book3e_0x500:
603 /* XXX When adding support for EPR, use PACA_IRQ_EE_EDGE */
605 b masked_interrupt_book3e_full_mask
607 masked_interrupt_book3e_0x900:
610 b masked_interrupt_book3e_no_mask
611 masked_interrupt_book3e_0x980:
614 b masked_interrupt_book3e_no_mask
615 masked_interrupt_book3e_0x280:
616 masked_interrupt_book3e_0x2c0:
617 li r11,PACA_IRQ_DBELL
618 b masked_interrupt_book3e_no_mask
620 masked_interrupt_book3e_no_mask:
622 lbz r10,PACAIRQHAPPENED(r13)
624 stb r10,PACAIRQHAPPENED(r13)
626 masked_interrupt_book3e_full_mask:
628 lbz r10,PACAIRQHAPPENED(r13)
630 stb r10,PACAIRQHAPPENED(r13)
632 rldicl r11,r10,48,1 /* clear MSR_EE */
635 1: ld r10,PACA_EXGEN+EX_R10(r13);
636 ld r11,PACA_EXGEN+EX_R11(r13);
637 mfspr r13,SPRN_SPRG_GEN_SCRATCH;
641 * Called from arch_local_irq_enable when an interrupt needs
642 * to be resent. r3 contains either 0x500,0x900,0x260 or 0x280
643 * to indicate the kind of interrupt. MSR:EE is already off.
644 * We generate a stackframe like if a real interrupt had happened.
646 * Note: While MSR:EE is off, we need to make sure that _MSR
647 * in the generated frame has EE set to 1 or the exception
648 * handler will not properly re-enable them.
650 _GLOBAL(__replay_interrupt)
651 /* We are going to jump to the exception common code which
652 * will retrieve various register values from the PACA which
653 * we don't give a damn about.
658 mtspr SPRN_SPRG_GEN_SCRATCH,r13;
659 std r1,PACA_EXGEN+EX_R1(r13);
660 stw r4,PACA_EXGEN+EX_CR(r13);
662 subi r1,r1,INT_FRAME_SIZE;
673 * This is called from 0x300 and 0x400 handlers after the prologs with
674 * r14 and r15 containing the fault address and error code, with the
675 * original values stashed away in the PACA
677 storage_fault_common:
680 addi r3,r1,STACK_FRAME_OVERHEAD
683 ld r14,PACA_EXGEN+EX_R14(r13)
684 ld r15,PACA_EXGEN+EX_R15(r13)
688 b .ret_from_except_lite
691 addi r3,r1,STACK_FRAME_OVERHEAD
697 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
703 addi r3,r1,STACK_FRAME_OVERHEAD
704 ld r14,PACA_EXGEN+EX_R14(r13)
705 ld r15,PACA_EXGEN+EX_R15(r13)
708 bl .alignment_exception
712 * We branch here from entry_64.S for the last stage of the exception
713 * return code path. MSR:EE is expected to be off at that point
715 _GLOBAL(exception_return_book3e)
718 /* This is the return from load_up_fpu fast path which could do with
719 * less GPR restores in fact, but for now we have a single return path
721 .globl fast_exception_return
722 fast_exception_return:
730 ACCOUNT_CPU_USER_EXIT(r10, r11)
733 1: stdcx. r0,0,r1 /* to clear the reservation */
747 mtspr SPRN_SPRG_GEN_SCRATCH,r0
749 std r10,PACA_EXGEN+EX_R10(r13);
750 std r11,PACA_EXGEN+EX_R11(r13);
757 ld r10,PACA_EXGEN+EX_R10(r13)
758 ld r11,PACA_EXGEN+EX_R11(r13)
759 mfspr r13,SPRN_SPRG_GEN_SCRATCH
763 * Trampolines used when spotting a bad kernel stack pointer in
764 * the exception entry code.
766 * TODO: move some bits like SRR0 read to trampoline, pass PACA
767 * index around, etc... to handle crit & mcheck
769 BAD_STACK_TRAMPOLINE(0x000)
770 BAD_STACK_TRAMPOLINE(0x100)
771 BAD_STACK_TRAMPOLINE(0x200)
772 BAD_STACK_TRAMPOLINE(0x260)
773 BAD_STACK_TRAMPOLINE(0x280)
774 BAD_STACK_TRAMPOLINE(0x2a0)
775 BAD_STACK_TRAMPOLINE(0x2c0)
776 BAD_STACK_TRAMPOLINE(0x2e0)
777 BAD_STACK_TRAMPOLINE(0x300)
778 BAD_STACK_TRAMPOLINE(0x310)
779 BAD_STACK_TRAMPOLINE(0x320)
780 BAD_STACK_TRAMPOLINE(0x400)
781 BAD_STACK_TRAMPOLINE(0x500)
782 BAD_STACK_TRAMPOLINE(0x600)
783 BAD_STACK_TRAMPOLINE(0x700)
784 BAD_STACK_TRAMPOLINE(0x800)
785 BAD_STACK_TRAMPOLINE(0x900)
786 BAD_STACK_TRAMPOLINE(0x980)
787 BAD_STACK_TRAMPOLINE(0x9f0)
788 BAD_STACK_TRAMPOLINE(0xa00)
789 BAD_STACK_TRAMPOLINE(0xb00)
790 BAD_STACK_TRAMPOLINE(0xc00)
791 BAD_STACK_TRAMPOLINE(0xd00)
792 BAD_STACK_TRAMPOLINE(0xd08)
793 BAD_STACK_TRAMPOLINE(0xe00)
794 BAD_STACK_TRAMPOLINE(0xf00)
795 BAD_STACK_TRAMPOLINE(0xf20)
797 .globl bad_stack_book3e
799 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
800 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
801 ld r1,PACAEMERGSP(r13)
802 subi r1,r1,64+INT_FRAME_SIZE
805 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
806 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
813 std r0,GPR0(r1); /* save r0 in stackframe */ \
814 std r2,GPR2(r1); /* save r2 in stackframe */ \
815 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
816 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
817 std r9,GPR9(r1); /* save r9 in stackframe */ \
818 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
819 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
820 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
821 std r3,GPR10(r1); /* save r10 to stackframe */ \
822 std r4,GPR11(r1); /* save r11 to stackframe */ \
823 std r12,GPR12(r1); /* save r12 in stackframe */ \
824 std r5,GPR13(r1); /* save it to stackframe */ \
833 lhz r12,PACA_TRAP_SAVE(r13)
835 addi r11,r1,INT_FRAME_SIZE
840 1: addi r3,r1,STACK_FRAME_OVERHEAD
845 * Setup the initial TLB for a core. This current implementation
846 * assume that whatever we are running off will not conflict with
847 * the new mapping at PAGE_OFFSET.
849 _GLOBAL(initial_tlb_book3e)
851 /* Look for the first TLB with IPROT set */
852 mfspr r4,SPRN_TLB0CFG
853 andi. r3,r4,TLBnCFG_IPROT
854 lis r3,MAS0_TLBSEL(0)@h
857 mfspr r4,SPRN_TLB1CFG
858 andi. r3,r4,TLBnCFG_IPROT
859 lis r3,MAS0_TLBSEL(1)@h
862 mfspr r4,SPRN_TLB2CFG
863 andi. r3,r4,TLBnCFG_IPROT
864 lis r3,MAS0_TLBSEL(2)@h
867 lis r3,MAS0_TLBSEL(3)@h
868 mfspr r4,SPRN_TLB3CFG
872 andi. r5,r4,TLBnCFG_HES
875 mflr r8 /* save LR */
876 /* 1. Find the index of the entry we're executing in
878 * r3 = MAS0_TLBSEL (for the iprot array)
881 bl invstr /* Find our address */
882 invstr: mflr r6 /* Make it accessible */
884 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
889 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
892 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
894 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
895 oris r7,r7,MAS1_IPROT@h
899 /* 2. Invalidate all entries except the entry we're executing in
901 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
903 * r5 = ESEL of entry we are running in
905 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
906 li r6,0 /* Set Entry counter to 0 */
907 1: mr r7,r3 /* Set MAS0(TLBSEL) */
908 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
912 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
914 beq skpinv /* Dont update the current execution TLB */
918 skpinv: addi r6,r6,1 /* Increment */
919 cmpw r6,r4 /* Are we done? */
920 bne 1b /* If not, repeat */
922 /* Invalidate all TLBs */
927 /* 3. Setup a temp mapping and jump to it
929 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
930 * r5 = ESEL of entry we are running in
932 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
934 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
938 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
942 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
950 bl 1f /* Find our address */
957 /* 4. Clear out PIDs & Search info
959 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
960 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
967 /* 5. Invalidate mapping we started in
969 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
970 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
976 rlwinm r6,r6,0,2,0 /* clear IPROT */
980 /* Invalidate TLB1 */
985 /* The mapping only needs to be cache-coherent on SMP */
987 #define M_IF_SMP MAS2_M
992 /* 6. Setup KERNELBASE mapping in TLB[0]
994 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
995 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
998 rlwinm r3,r3,0,16,3 /* clear ESEL */
1000 lis r6,(MAS1_VALID|MAS1_IPROT)@h
1001 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
1004 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_SMP)
1008 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
1015 /* 7. Jump to KERNELBASE mapping
1017 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1019 /* Now we branch the new virtual address mapped by this entry */
1020 LOAD_REG_IMMEDIATE(r6,2f)
1022 ori r7,r7,MSR_KERNEL@l
1025 rfi /* start execution out of TLB1[0] entry */
1028 /* 8. Clear out the temp mapping
1030 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1035 rlwinm r5,r5,0,2,0 /* clear IPROT */
1039 /* Invalidate TLB1 */
1040 PPC_TLBILX_ALL(0,R0)
1044 /* We translate LR and return */
1050 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
1051 * kernel linear mapping. We also set MAS8 once for all here though
1052 * that will have to be made dependent on whether we are running under
1053 * a hypervisor I suppose.
1057 * This code is called as an ordinary function on the boot CPU. But to
1058 * avoid duplication, this code is also used in SCOM bringup of
1059 * secondary CPUs. We read the code between the initial_tlb_code_start
1060 * and initial_tlb_code_end labels one instruction at a time and RAM it
1061 * into the new core via SCOM. That doesn't process branches, so there
1062 * must be none between those two labels. It also means if this code
1063 * ever takes any parameters, the SCOM code must also be updated to
1066 .globl a2_tlbinit_code_start
1067 a2_tlbinit_code_start:
1069 ori r11,r3,MAS0_WQ_ALLWAYS
1070 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
1072 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1073 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
1075 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
1077 li r3,MAS3_SR | MAS3_SW | MAS3_SX
1078 mtspr SPRN_MAS7_MAS3,r3
1082 /* Write the TLB entry */
1085 .globl a2_tlbinit_after_linear_map
1086 a2_tlbinit_after_linear_map:
1088 /* Now we branch the new virtual address mapped by this entry */
1089 LOAD_REG_IMMEDIATE(r3,1f)
1093 1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
1094 * else (including IPROTed things left by firmware)
1096 * r3 = current address (more or less)
1103 rlwinm r9,r4,0,TLBnCFG_N_ENTRY
1104 rlwinm r10,r4,8,0xff
1105 addi r10,r10,-1 /* Get inner loop mask */
1110 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT))
1113 rldicr r6,r6,0,51 /* Extract EPN */
1116 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */
1118 rlwinm r8,r7,16,0xfff /* Extract ESEL */
1123 rlwimi r7,r4,16,MAS0_ESEL_MASK
1134 addis r6,r6,(1<<30)@h
1139 .globl a2_tlbinit_after_iprot_flush
1140 a2_tlbinit_after_iprot_flush:
1142 #ifdef CONFIG_PPC_EARLY_DEBUG_WSP
1143 /* Now establish early debug mappings if applicable */
1144 /* Restore the MAS0 we used for linear mapping load */
1147 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1148 ori r3,r3,(BOOK3E_PAGESZ_4K << MAS1_TSIZE_SHIFT)
1150 LOAD_REG_IMMEDIATE(r3, WSP_UART_VIRT | MAS2_I | MAS2_G)
1152 LOAD_REG_IMMEDIATE(r3, WSP_UART_PHYS | MAS3_SR | MAS3_SW)
1153 mtspr SPRN_MAS7_MAS3,r3
1154 /* re-use the MAS8 value from the linear mapping */
1156 #endif /* CONFIG_PPC_EARLY_DEBUG_WSP */
1162 .globl a2_tlbinit_code_end
1163 a2_tlbinit_code_end:
1165 /* We translate LR and return */
1172 * Main entry (boot CPU, thread 0)
1174 * We enter here from head_64.S, possibly after the prom_init trampoline
1175 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
1176 * mode. Anything else is as it was left by the bootloader
1178 * Initial requirements of this port:
1180 * - Kernel loaded at 0 physical
1181 * - A good lump of memory mapped 0:0 by UTLB entry 0
1182 * - MSR:IS & MSR:DS set to 0
1184 * Note that some of the above requirements will be relaxed in the future
1185 * as the kernel becomes smarter at dealing with different initial conditions
1186 * but for now you have to be careful
1188 _GLOBAL(start_initialization_book3e)
1191 /* First, we need to setup some initial TLBs to map the kernel
1192 * text, data and bss at PAGE_OFFSET. We don't have a real mode
1193 * and always use AS 0, so we just set it up to match our link
1194 * address and never use 0 based addresses.
1196 bl .initial_tlb_book3e
1198 /* Init global core bits */
1199 bl .init_core_book3e
1201 /* Init per-thread bits */
1202 bl .init_thread_book3e
1204 /* Return to common init code */
1211 * Secondary core/processor entry
1213 * This is entered for thread 0 of a secondary core, all other threads
1214 * are expected to be stopped. It's similar to start_initialization_book3e
1215 * except that it's generally entered from the holding loop in head_64.S
1216 * after CPUs have been gathered by Open Firmware.
1218 * We assume we are in 32 bits mode running with whatever TLB entry was
1219 * set for us by the firmware or POR engine.
1221 _GLOBAL(book3e_secondary_core_init_tlb_set)
1223 b .generic_secondary_smp_init
1225 _GLOBAL(book3e_secondary_core_init)
1228 /* Do we need to setup initial TLB entry ? */
1232 /* Setup TLB for this core */
1233 bl .initial_tlb_book3e
1235 /* We can return from the above running at a different
1236 * address, so recalculate r2 (TOC)
1240 /* Init global core bits */
1241 2: bl .init_core_book3e
1243 /* Init per-thread bits */
1244 3: bl .init_thread_book3e
1246 /* Return to common init code at proper virtual address.
1248 * Due to various previous assumptions, we know we entered this
1249 * function at either the final PAGE_OFFSET mapping or using a
1250 * 1:1 mapping at 0, so we don't bother doing a complicated check
1251 * here, we just ensure the return address has the right top bits.
1253 * Note that if we ever want to be smarter about where we can be
1254 * started from, we have to be careful that by the time we reach
1255 * the code below we may already be running at a different location
1256 * than the one we were called from since initial_tlb_book3e can
1257 * have moved us already.
1261 lis r3,PAGE_OFFSET@highest
1267 _GLOBAL(book3e_secondary_thread_init)
1271 _STATIC(init_core_book3e)
1272 /* Establish the interrupt vector base */
1273 LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
1278 _STATIC(init_thread_book3e)
1279 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
1282 /* Make sure interrupts are off */
1285 /* disable all timers and clear out status */
1293 _GLOBAL(__setup_base_ivors)
1294 SET_IVOR(0, 0x020) /* Critical Input */
1295 SET_IVOR(1, 0x000) /* Machine Check */
1296 SET_IVOR(2, 0x060) /* Data Storage */
1297 SET_IVOR(3, 0x080) /* Instruction Storage */
1298 SET_IVOR(4, 0x0a0) /* External Input */
1299 SET_IVOR(5, 0x0c0) /* Alignment */
1300 SET_IVOR(6, 0x0e0) /* Program */
1301 SET_IVOR(7, 0x100) /* FP Unavailable */
1302 SET_IVOR(8, 0x120) /* System Call */
1303 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1304 SET_IVOR(10, 0x160) /* Decrementer */
1305 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1306 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1307 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1308 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1309 SET_IVOR(15, 0x040) /* Debug */
1315 _GLOBAL(setup_perfmon_ivor)
1316 SET_IVOR(35, 0x260) /* Performance Monitor */
1319 _GLOBAL(setup_doorbell_ivors)
1320 SET_IVOR(36, 0x280) /* Processor Doorbell */
1321 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */
1323 /* Check MMUCFG[LPIDSIZE] to determine if we have category E.HV */
1324 mfspr r10,SPRN_MMUCFG
1325 rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
1328 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */
1329 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */
1332 _GLOBAL(setup_ehv_ivors)
1334 * We may be running as a guest and lack E.HV even on a chip
1335 * that normally has it.
1337 mfspr r10,SPRN_MMUCFG
1338 rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
1341 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */
1342 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */