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Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[deliverable/linux.git] / arch / powerpc / kernel / exceptions-64e.S
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_FRAME_SIZE INT_FRAME_SIZE
38
39 /* Exception prolog code for all exceptions */
40 #define EXCEPTION_PROLOG(n, intnum, type, addition) \
41 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
42 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
43 std r10,PACA_EX##type+EX_R10(r13); \
44 std r11,PACA_EX##type+EX_R11(r13); \
45 PROLOG_STORE_RESTORE_SCRATCH_##type; \
46 mfcr r10; /* save CR */ \
47 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
48 DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \
49 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
50 addition; /* additional code for that exc. */ \
51 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
52 type##_SET_KSTACK; /* get special stack if necessary */\
53 andi. r10,r11,MSR_PR; /* save stack pointer */ \
54 beq 1f; /* branch around if supervisor */ \
55 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
56 1: cmpdi cr1,r1,0; /* check if SP makes sense */ \
57 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
58 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
59
60 /* Exception type-specific macros */
61 #define GEN_SET_KSTACK \
62 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
63 #define SPRN_GEN_SRR0 SPRN_SRR0
64 #define SPRN_GEN_SRR1 SPRN_SRR1
65
66 #define GDBELL_SET_KSTACK GEN_SET_KSTACK
67 #define SPRN_GDBELL_SRR0 SPRN_GSRR0
68 #define SPRN_GDBELL_SRR1 SPRN_GSRR1
69
70 #define CRIT_SET_KSTACK \
71 ld r1,PACA_CRIT_STACK(r13); \
72 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
73 #define SPRN_CRIT_SRR0 SPRN_CSRR0
74 #define SPRN_CRIT_SRR1 SPRN_CSRR1
75
76 #define DBG_SET_KSTACK \
77 ld r1,PACA_DBG_STACK(r13); \
78 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
79 #define SPRN_DBG_SRR0 SPRN_DSRR0
80 #define SPRN_DBG_SRR1 SPRN_DSRR1
81
82 #define MC_SET_KSTACK \
83 ld r1,PACA_MC_STACK(r13); \
84 subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
85 #define SPRN_MC_SRR0 SPRN_MCSRR0
86 #define SPRN_MC_SRR1 SPRN_MCSRR1
87
88 #define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \
89 EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n))
90
91 #define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \
92 EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n))
93
94 #define DBG_EXCEPTION_PROLOG(n, intnum, addition) \
95 EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n))
96
97 #define MC_EXCEPTION_PROLOG(n, intnum, addition) \
98 EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n))
99
100 #define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \
101 EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n))
102
103 /*
104 * Store user-visible scratch in PACA exception slots and restore proper value
105 */
106 #define PROLOG_STORE_RESTORE_SCRATCH_GEN
107 #define PROLOG_STORE_RESTORE_SCRATCH_GDBELL
108 #define PROLOG_STORE_RESTORE_SCRATCH_DBG
109 #define PROLOG_STORE_RESTORE_SCRATCH_MC
110
111 #define PROLOG_STORE_RESTORE_SCRATCH_CRIT \
112 mfspr r10,SPRN_SPRG_CRIT_SCRATCH; /* get r13 */ \
113 std r10,PACA_EXCRIT+EX_R13(r13); \
114 ld r11,PACA_SPRG3(r13); \
115 mtspr SPRN_SPRG_CRIT_SCRATCH,r11;
116
117 /* Variants of the "addition" argument for the prolog
118 */
119 #define PROLOG_ADDITION_NONE_GEN(n)
120 #define PROLOG_ADDITION_NONE_GDBELL(n)
121 #define PROLOG_ADDITION_NONE_CRIT(n)
122 #define PROLOG_ADDITION_NONE_DBG(n)
123 #define PROLOG_ADDITION_NONE_MC(n)
124
125 #define PROLOG_ADDITION_MASKABLE_GEN(n) \
126 lbz r10,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */ \
127 cmpwi cr0,r10,0; /* yes -> go out of line */ \
128 beq masked_interrupt_book3e_##n
129
130 #define PROLOG_ADDITION_2REGS_GEN(n) \
131 std r14,PACA_EXGEN+EX_R14(r13); \
132 std r15,PACA_EXGEN+EX_R15(r13)
133
134 #define PROLOG_ADDITION_1REG_GEN(n) \
135 std r14,PACA_EXGEN+EX_R14(r13);
136
137 #define PROLOG_ADDITION_2REGS_CRIT(n) \
138 std r14,PACA_EXCRIT+EX_R14(r13); \
139 std r15,PACA_EXCRIT+EX_R15(r13)
140
141 #define PROLOG_ADDITION_2REGS_DBG(n) \
142 std r14,PACA_EXDBG+EX_R14(r13); \
143 std r15,PACA_EXDBG+EX_R15(r13)
144
145 #define PROLOG_ADDITION_2REGS_MC(n) \
146 std r14,PACA_EXMC+EX_R14(r13); \
147 std r15,PACA_EXMC+EX_R15(r13)
148
149
150 /* Core exception code for all exceptions except TLB misses.
151 * XXX: Needs to make SPRN_SPRG_GEN depend on exception type
152 */
153 #define EXCEPTION_COMMON(n, excf, ints) \
154 exc_##n##_common: \
155 std r0,GPR0(r1); /* save r0 in stackframe */ \
156 std r2,GPR2(r1); /* save r2 in stackframe */ \
157 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
158 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
159 std r9,GPR9(r1); /* save r9 in stackframe */ \
160 std r10,_NIP(r1); /* save SRR0 to stackframe */ \
161 std r11,_MSR(r1); /* save SRR1 to stackframe */ \
162 beq 2f; /* if from kernel mode */ \
163 ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
164 2: ld r3,excf+EX_R10(r13); /* get back r10 */ \
165 ld r4,excf+EX_R11(r13); /* get back r11 */ \
166 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 */ \
167 std r12,GPR12(r1); /* save r12 in stackframe */ \
168 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
169 mflr r6; /* save LR in stackframe */ \
170 mfctr r7; /* save CTR in stackframe */ \
171 mfspr r8,SPRN_XER; /* save XER in stackframe */ \
172 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
173 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
174 lbz r11,PACASOFTIRQEN(r13); /* get current IRQ softe */ \
175 ld r12,exception_marker@toc(r2); \
176 li r0,0; \
177 std r3,GPR10(r1); /* save r10 to stackframe */ \
178 std r4,GPR11(r1); /* save r11 to stackframe */ \
179 std r5,GPR13(r1); /* save it to stackframe */ \
180 std r6,_LINK(r1); \
181 std r7,_CTR(r1); \
182 std r8,_XER(r1); \
183 li r3,(n)+1; /* indicate partial regs in trap */ \
184 std r9,0(r1); /* store stack frame back link */ \
185 std r10,_CCR(r1); /* store orig CR in stackframe */ \
186 std r9,GPR1(r1); /* store stack frame back link */ \
187 std r11,SOFTE(r1); /* and save it to stackframe */ \
188 std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
189 std r3,_TRAP(r1); /* set trap number */ \
190 std r0,RESULT(r1); /* clear regs->result */ \
191 ints;
192
193 /* Variants for the "ints" argument. This one does nothing when we want
194 * to keep interrupts in their original state
195 */
196 #define INTS_KEEP
197
198 /* This second version is meant for exceptions that don't immediately
199 * hard-enable. We set a bit in paca->irq_happened to ensure that
200 * a subsequent call to arch_local_irq_restore() will properly
201 * hard-enable and avoid the fast-path, and then reconcile irq state.
202 */
203 #define INTS_DISABLE RECONCILE_IRQ_STATE(r3,r4)
204
205 /* This is called by exceptions that used INTS_KEEP (that did not touch
206 * irq indicators in the PACA). This will restore MSR:EE to it's previous
207 * value
208 *
209 * XXX In the long run, we may want to open-code it in order to separate the
210 * load from the wrtee, thus limiting the latency caused by the dependency
211 * but at this point, I'll favor code clarity until we have a near to final
212 * implementation
213 */
214 #define INTS_RESTORE_HARD \
215 ld r11,_MSR(r1); \
216 wrtee r11;
217
218 /* XXX FIXME: Restore r14/r15 when necessary */
219 #define BAD_STACK_TRAMPOLINE(n) \
220 exc_##n##_bad_stack: \
221 li r1,(n); /* get exception number */ \
222 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
223 b bad_stack_book3e; /* bad stack error */
224
225 /* WARNING: If you change the layout of this stub, make sure you chcek
226 * the debug exception handler which handles single stepping
227 * into exceptions from userspace, and the MM code in
228 * arch/powerpc/mm/tlb_nohash.c which patches the branch here
229 * and would need to be updated if that branch is moved
230 */
231 #define EXCEPTION_STUB(loc, label) \
232 . = interrupt_base_book3e + loc; \
233 nop; /* To make debug interrupts happy */ \
234 b exc_##label##_book3e;
235
236 #define ACK_NONE(r)
237 #define ACK_DEC(r) \
238 lis r,TSR_DIS@h; \
239 mtspr SPRN_TSR,r
240 #define ACK_FIT(r) \
241 lis r,TSR_FIS@h; \
242 mtspr SPRN_TSR,r
243
244 /* Used by asynchronous interrupt that may happen in the idle loop.
245 *
246 * This check if the thread was in the idle loop, and if yes, returns
247 * to the caller rather than the PC. This is to avoid a race if
248 * interrupts happen before the wait instruction.
249 */
250 #define CHECK_NAPPING() \
251 CURRENT_THREAD_INFO(r11, r1); \
252 ld r10,TI_LOCAL_FLAGS(r11); \
253 andi. r9,r10,_TLF_NAPPING; \
254 beq+ 1f; \
255 ld r8,_LINK(r1); \
256 rlwinm r7,r10,0,~_TLF_NAPPING; \
257 std r8,_NIP(r1); \
258 std r7,TI_LOCAL_FLAGS(r11); \
259 1:
260
261
262 #define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \
263 START_EXCEPTION(label); \
264 NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\
265 EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE) \
266 ack(r8); \
267 CHECK_NAPPING(); \
268 addi r3,r1,STACK_FRAME_OVERHEAD; \
269 bl hdlr; \
270 b .ret_from_except_lite;
271
272 /* This value is used to mark exception frames on the stack. */
273 .section ".toc","aw"
274 exception_marker:
275 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
276
277
278 /*
279 * And here we have the exception vectors !
280 */
281
282 .text
283 .balign 0x1000
284 .globl interrupt_base_book3e
285 interrupt_base_book3e: /* fake trap */
286 EXCEPTION_STUB(0x000, machine_check) /* 0x0200 */
287 EXCEPTION_STUB(0x020, critical_input) /* 0x0580 */
288 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
289 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
290 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
291 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
292 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
293 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
294 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
295 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
296 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
297 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
298 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
299 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
300 EXCEPTION_STUB(0x1c0, data_tlb_miss)
301 EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
302 EXCEPTION_STUB(0x200, altivec_unavailable) /* 0x0f20 */
303 EXCEPTION_STUB(0x220, altivec_assist) /* 0x1700 */
304 EXCEPTION_STUB(0x260, perfmon)
305 EXCEPTION_STUB(0x280, doorbell)
306 EXCEPTION_STUB(0x2a0, doorbell_crit)
307 EXCEPTION_STUB(0x2c0, guest_doorbell)
308 EXCEPTION_STUB(0x2e0, guest_doorbell_crit)
309 EXCEPTION_STUB(0x300, hypercall)
310 EXCEPTION_STUB(0x320, ehpriv)
311
312 .globl interrupt_end_book3e
313 interrupt_end_book3e:
314
315 /* Critical Input Interrupt */
316 START_EXCEPTION(critical_input);
317 CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL,
318 PROLOG_ADDITION_NONE)
319 // EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE)
320 // bl special_reg_save_crit
321 // CHECK_NAPPING();
322 // addi r3,r1,STACK_FRAME_OVERHEAD
323 // bl .critical_exception
324 // b ret_from_crit_except
325 b .
326
327 /* Machine Check Interrupt */
328 START_EXCEPTION(machine_check);
329 MC_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_MACHINE_CHECK,
330 PROLOG_ADDITION_NONE)
331 // EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE)
332 // bl special_reg_save_mc
333 // addi r3,r1,STACK_FRAME_OVERHEAD
334 // CHECK_NAPPING();
335 // bl .machine_check_exception
336 // b ret_from_mc_except
337 b .
338
339 /* Data Storage Interrupt */
340 START_EXCEPTION(data_storage)
341 NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE,
342 PROLOG_ADDITION_2REGS)
343 mfspr r14,SPRN_DEAR
344 mfspr r15,SPRN_ESR
345 EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_DISABLE)
346 b storage_fault_common
347
348 /* Instruction Storage Interrupt */
349 START_EXCEPTION(instruction_storage);
350 NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE,
351 PROLOG_ADDITION_2REGS)
352 li r15,0
353 mr r14,r10
354 EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_DISABLE)
355 b storage_fault_common
356
357 /* External Input Interrupt */
358 MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL,
359 external_input, .do_IRQ, ACK_NONE)
360
361 /* Alignment */
362 START_EXCEPTION(alignment);
363 NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT,
364 PROLOG_ADDITION_2REGS)
365 mfspr r14,SPRN_DEAR
366 mfspr r15,SPRN_ESR
367 EXCEPTION_COMMON(0x600, PACA_EXGEN, INTS_KEEP)
368 b alignment_more /* no room, go out of line */
369
370 /* Program Interrupt */
371 START_EXCEPTION(program);
372 NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM,
373 PROLOG_ADDITION_1REG)
374 mfspr r14,SPRN_ESR
375 EXCEPTION_COMMON(0x700, PACA_EXGEN, INTS_DISABLE)
376 std r14,_DSISR(r1)
377 addi r3,r1,STACK_FRAME_OVERHEAD
378 ld r14,PACA_EXGEN+EX_R14(r13)
379 bl .save_nvgprs
380 bl .program_check_exception
381 b .ret_from_except
382
383 /* Floating Point Unavailable Interrupt */
384 START_EXCEPTION(fp_unavailable);
385 NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL,
386 PROLOG_ADDITION_NONE)
387 /* we can probably do a shorter exception entry for that one... */
388 EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP)
389 ld r12,_MSR(r1)
390 andi. r0,r12,MSR_PR;
391 beq- 1f
392 bl .load_up_fpu
393 b fast_exception_return
394 1: INTS_DISABLE
395 bl .save_nvgprs
396 addi r3,r1,STACK_FRAME_OVERHEAD
397 bl .kernel_fp_unavailable_exception
398 b .ret_from_except
399
400 /* Altivec Unavailable Interrupt */
401 START_EXCEPTION(altivec_unavailable);
402 NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
403 PROLOG_ADDITION_NONE)
404 /* we can probably do a shorter exception entry for that one... */
405 EXCEPTION_COMMON(0x200, PACA_EXGEN, INTS_KEEP)
406 #ifdef CONFIG_ALTIVEC
407 BEGIN_FTR_SECTION
408 ld r12,_MSR(r1)
409 andi. r0,r12,MSR_PR;
410 beq- 1f
411 bl .load_up_altivec
412 b fast_exception_return
413 1:
414 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
415 #endif
416 INTS_DISABLE
417 bl .save_nvgprs
418 addi r3,r1,STACK_FRAME_OVERHEAD
419 bl .altivec_unavailable_exception
420 b .ret_from_except
421
422 /* AltiVec Assist */
423 START_EXCEPTION(altivec_assist);
424 NORMAL_EXCEPTION_PROLOG(0x220, BOOKE_INTERRUPT_ALTIVEC_ASSIST,
425 PROLOG_ADDITION_NONE)
426 EXCEPTION_COMMON(0x220, PACA_EXGEN, INTS_DISABLE)
427 bl .save_nvgprs
428 addi r3,r1,STACK_FRAME_OVERHEAD
429 #ifdef CONFIG_ALTIVEC
430 BEGIN_FTR_SECTION
431 bl .altivec_assist_exception
432 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
433 #else
434 bl .unknown_exception
435 #endif
436 b .ret_from_except
437
438
439 /* Decrementer Interrupt */
440 MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER,
441 decrementer, .timer_interrupt, ACK_DEC)
442
443 /* Fixed Interval Timer Interrupt */
444 MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT,
445 fixed_interval, .unknown_exception, ACK_FIT)
446
447 /* Watchdog Timer Interrupt */
448 START_EXCEPTION(watchdog);
449 CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG,
450 PROLOG_ADDITION_NONE)
451 // EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE)
452 // bl special_reg_save_crit
453 // CHECK_NAPPING();
454 // addi r3,r1,STACK_FRAME_OVERHEAD
455 // bl .unknown_exception
456 // b ret_from_crit_except
457 b .
458
459 /* System Call Interrupt */
460 START_EXCEPTION(system_call)
461 mr r9,r13 /* keep a copy of userland r13 */
462 mfspr r11,SPRN_SRR0 /* get return address */
463 mfspr r12,SPRN_SRR1 /* get previous MSR */
464 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
465 b system_call_common
466
467 /* Auxiliary Processor Unavailable Interrupt */
468 START_EXCEPTION(ap_unavailable);
469 NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL,
470 PROLOG_ADDITION_NONE)
471 EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_DISABLE)
472 bl .save_nvgprs
473 addi r3,r1,STACK_FRAME_OVERHEAD
474 bl .unknown_exception
475 b .ret_from_except
476
477 /* Debug exception as a critical interrupt*/
478 START_EXCEPTION(debug_crit);
479 CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
480 PROLOG_ADDITION_2REGS)
481
482 /*
483 * If there is a single step or branch-taken exception in an
484 * exception entry sequence, it was probably meant to apply to
485 * the code where the exception occurred (since exception entry
486 * doesn't turn off DE automatically). We simulate the effect
487 * of turning off DE on entry to an exception handler by turning
488 * off DE in the CSRR1 value and clearing the debug status.
489 */
490
491 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
492 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
493 beq+ 1f
494
495 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
496 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
497 cmpld cr0,r10,r14
498 cmpld cr1,r10,r15
499 blt+ cr0,1f
500 bge+ cr1,1f
501
502 /* here it looks like we got an inappropriate debug exception. */
503 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
504 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
505 mtspr SPRN_DBSR,r14
506 mtspr SPRN_CSRR1,r11
507 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
508 ld r1,PACA_EXCRIT+EX_R1(r13)
509 ld r14,PACA_EXCRIT+EX_R14(r13)
510 ld r15,PACA_EXCRIT+EX_R15(r13)
511 mtcr r10
512 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
513 ld r11,PACA_EXCRIT+EX_R11(r13)
514 ld r13,PACA_EXCRIT+EX_R13(r13)
515 rfci
516
517 /* Normal debug exception */
518 /* XXX We only handle coming from userspace for now since we can't
519 * quite save properly an interrupted kernel state yet
520 */
521 1: andi. r14,r11,MSR_PR; /* check for userspace again */
522 beq kernel_dbg_exc; /* if from kernel mode */
523
524 /* Now we mash up things to make it look like we are coming on a
525 * normal exception
526 */
527 ld r15,PACA_EXCRIT+EX_R13(r13)
528 mtspr SPRN_SPRG_GEN_SCRATCH,r15
529 mfspr r14,SPRN_DBSR
530 EXCEPTION_COMMON(0xd00, PACA_EXCRIT, INTS_DISABLE)
531 std r14,_DSISR(r1)
532 addi r3,r1,STACK_FRAME_OVERHEAD
533 mr r4,r14
534 ld r14,PACA_EXCRIT+EX_R14(r13)
535 ld r15,PACA_EXCRIT+EX_R15(r13)
536 bl .save_nvgprs
537 bl .DebugException
538 b .ret_from_except
539
540 kernel_dbg_exc:
541 b . /* NYI */
542
543 /* Debug exception as a debug interrupt*/
544 START_EXCEPTION(debug_debug);
545 DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
546 PROLOG_ADDITION_2REGS)
547
548 /*
549 * If there is a single step or branch-taken exception in an
550 * exception entry sequence, it was probably meant to apply to
551 * the code where the exception occurred (since exception entry
552 * doesn't turn off DE automatically). We simulate the effect
553 * of turning off DE on entry to an exception handler by turning
554 * off DE in the DSRR1 value and clearing the debug status.
555 */
556
557 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
558 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
559 beq+ 1f
560
561 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
562 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
563 cmpld cr0,r10,r14
564 cmpld cr1,r10,r15
565 blt+ cr0,1f
566 bge+ cr1,1f
567
568 /* here it looks like we got an inappropriate debug exception. */
569 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
570 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
571 mtspr SPRN_DBSR,r14
572 mtspr SPRN_DSRR1,r11
573 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */
574 ld r1,PACA_EXDBG+EX_R1(r13)
575 ld r14,PACA_EXDBG+EX_R14(r13)
576 ld r15,PACA_EXDBG+EX_R15(r13)
577 mtcr r10
578 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */
579 ld r11,PACA_EXDBG+EX_R11(r13)
580 mfspr r13,SPRN_SPRG_DBG_SCRATCH
581 rfdi
582
583 /* Normal debug exception */
584 /* XXX We only handle coming from userspace for now since we can't
585 * quite save properly an interrupted kernel state yet
586 */
587 1: andi. r14,r11,MSR_PR; /* check for userspace again */
588 beq kernel_dbg_exc; /* if from kernel mode */
589
590 /* Now we mash up things to make it look like we are coming on a
591 * normal exception
592 */
593 mfspr r15,SPRN_SPRG_DBG_SCRATCH
594 mtspr SPRN_SPRG_GEN_SCRATCH,r15
595 mfspr r14,SPRN_DBSR
596 EXCEPTION_COMMON(0xd08, PACA_EXDBG, INTS_DISABLE)
597 std r14,_DSISR(r1)
598 addi r3,r1,STACK_FRAME_OVERHEAD
599 mr r4,r14
600 ld r14,PACA_EXDBG+EX_R14(r13)
601 ld r15,PACA_EXDBG+EX_R15(r13)
602 bl .save_nvgprs
603 bl .DebugException
604 b .ret_from_except
605
606 START_EXCEPTION(perfmon);
607 NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR,
608 PROLOG_ADDITION_NONE)
609 EXCEPTION_COMMON(0x260, PACA_EXGEN, INTS_DISABLE)
610 addi r3,r1,STACK_FRAME_OVERHEAD
611 bl .performance_monitor_exception
612 b .ret_from_except_lite
613
614 /* Doorbell interrupt */
615 MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL,
616 doorbell, .doorbell_exception, ACK_NONE)
617
618 /* Doorbell critical Interrupt */
619 START_EXCEPTION(doorbell_crit);
620 CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL,
621 PROLOG_ADDITION_NONE)
622 // EXCEPTION_COMMON(0x2a0, PACA_EXCRIT, INTS_DISABLE)
623 // bl special_reg_save_crit
624 // CHECK_NAPPING();
625 // addi r3,r1,STACK_FRAME_OVERHEAD
626 // bl .doorbell_critical_exception
627 // b ret_from_crit_except
628 b .
629
630 /*
631 * Guest doorbell interrupt
632 * This general exception use GSRRx save/restore registers
633 */
634 START_EXCEPTION(guest_doorbell);
635 GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL,
636 PROLOG_ADDITION_NONE)
637 EXCEPTION_COMMON(0x2c0, PACA_EXGEN, INTS_KEEP)
638 addi r3,r1,STACK_FRAME_OVERHEAD
639 bl .save_nvgprs
640 INTS_RESTORE_HARD
641 bl .unknown_exception
642 b .ret_from_except
643
644 /* Guest Doorbell critical Interrupt */
645 START_EXCEPTION(guest_doorbell_crit);
646 CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT,
647 PROLOG_ADDITION_NONE)
648 // EXCEPTION_COMMON(0x2e0, PACA_EXCRIT, INTS_DISABLE)
649 // bl special_reg_save_crit
650 // CHECK_NAPPING();
651 // addi r3,r1,STACK_FRAME_OVERHEAD
652 // bl .guest_doorbell_critical_exception
653 // b ret_from_crit_except
654 b .
655
656 /* Hypervisor call */
657 START_EXCEPTION(hypercall);
658 NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL,
659 PROLOG_ADDITION_NONE)
660 EXCEPTION_COMMON(0x310, PACA_EXGEN, INTS_KEEP)
661 addi r3,r1,STACK_FRAME_OVERHEAD
662 bl .save_nvgprs
663 INTS_RESTORE_HARD
664 bl .unknown_exception
665 b .ret_from_except
666
667 /* Embedded Hypervisor priviledged */
668 START_EXCEPTION(ehpriv);
669 NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV,
670 PROLOG_ADDITION_NONE)
671 EXCEPTION_COMMON(0x320, PACA_EXGEN, INTS_KEEP)
672 addi r3,r1,STACK_FRAME_OVERHEAD
673 bl .save_nvgprs
674 INTS_RESTORE_HARD
675 bl .unknown_exception
676 b .ret_from_except
677
678 /*
679 * An interrupt came in while soft-disabled; We mark paca->irq_happened
680 * accordingly and if the interrupt is level sensitive, we hard disable
681 */
682
683 .macro masked_interrupt_book3e paca_irq full_mask
684 lbz r10,PACAIRQHAPPENED(r13)
685 ori r10,r10,\paca_irq
686 stb r10,PACAIRQHAPPENED(r13)
687
688 .if \full_mask == 1
689 rldicl r10,r11,48,1 /* clear MSR_EE */
690 rotldi r11,r10,16
691 mtspr SPRN_SRR1,r11
692 .endif
693
694 lwz r11,PACA_EXGEN+EX_CR(r13)
695 mtcr r11
696 ld r10,PACA_EXGEN+EX_R10(r13)
697 ld r11,PACA_EXGEN+EX_R11(r13)
698 mfspr r13,SPRN_SPRG_GEN_SCRATCH
699 rfi
700 b .
701 .endm
702
703 masked_interrupt_book3e_0x500:
704 // XXX When adding support for EPR, use PACA_IRQ_EE_EDGE
705 masked_interrupt_book3e PACA_IRQ_EE 1
706
707 masked_interrupt_book3e_0x900:
708 ACK_DEC(r10);
709 masked_interrupt_book3e PACA_IRQ_DEC 0
710
711 masked_interrupt_book3e_0x980:
712 ACK_FIT(r10);
713 masked_interrupt_book3e PACA_IRQ_DEC 0
714
715 masked_interrupt_book3e_0x280:
716 masked_interrupt_book3e_0x2c0:
717 masked_interrupt_book3e PACA_IRQ_DBELL 0
718
719 /*
720 * Called from arch_local_irq_enable when an interrupt needs
721 * to be resent. r3 contains either 0x500,0x900,0x260 or 0x280
722 * to indicate the kind of interrupt. MSR:EE is already off.
723 * We generate a stackframe like if a real interrupt had happened.
724 *
725 * Note: While MSR:EE is off, we need to make sure that _MSR
726 * in the generated frame has EE set to 1 or the exception
727 * handler will not properly re-enable them.
728 */
729 _GLOBAL(__replay_interrupt)
730 /* We are going to jump to the exception common code which
731 * will retrieve various register values from the PACA which
732 * we don't give a damn about.
733 */
734 mflr r10
735 mfmsr r11
736 mfcr r4
737 mtspr SPRN_SPRG_GEN_SCRATCH,r13;
738 std r1,PACA_EXGEN+EX_R1(r13);
739 stw r4,PACA_EXGEN+EX_CR(r13);
740 ori r11,r11,MSR_EE
741 subi r1,r1,INT_FRAME_SIZE;
742 cmpwi cr0,r3,0x500
743 beq exc_0x500_common
744 cmpwi cr0,r3,0x900
745 beq exc_0x900_common
746 cmpwi cr0,r3,0x280
747 beq exc_0x280_common
748 blr
749
750
751 /*
752 * This is called from 0x300 and 0x400 handlers after the prologs with
753 * r14 and r15 containing the fault address and error code, with the
754 * original values stashed away in the PACA
755 */
756 storage_fault_common:
757 std r14,_DAR(r1)
758 std r15,_DSISR(r1)
759 addi r3,r1,STACK_FRAME_OVERHEAD
760 mr r4,r14
761 mr r5,r15
762 ld r14,PACA_EXGEN+EX_R14(r13)
763 ld r15,PACA_EXGEN+EX_R15(r13)
764 bl .do_page_fault
765 cmpdi r3,0
766 bne- 1f
767 b .ret_from_except_lite
768 1: bl .save_nvgprs
769 mr r5,r3
770 addi r3,r1,STACK_FRAME_OVERHEAD
771 ld r4,_DAR(r1)
772 bl .bad_page_fault
773 b .ret_from_except
774
775 /*
776 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
777 * continues here.
778 */
779 alignment_more:
780 std r14,_DAR(r1)
781 std r15,_DSISR(r1)
782 addi r3,r1,STACK_FRAME_OVERHEAD
783 ld r14,PACA_EXGEN+EX_R14(r13)
784 ld r15,PACA_EXGEN+EX_R15(r13)
785 bl .save_nvgprs
786 INTS_RESTORE_HARD
787 bl .alignment_exception
788 b .ret_from_except
789
790 /*
791 * We branch here from entry_64.S for the last stage of the exception
792 * return code path. MSR:EE is expected to be off at that point
793 */
794 _GLOBAL(exception_return_book3e)
795 b 1f
796
797 /* This is the return from load_up_fpu fast path which could do with
798 * less GPR restores in fact, but for now we have a single return path
799 */
800 .globl fast_exception_return
801 fast_exception_return:
802 wrteei 0
803 1: mr r0,r13
804 ld r10,_MSR(r1)
805 REST_4GPRS(2, r1)
806 andi. r6,r10,MSR_PR
807 REST_2GPRS(6, r1)
808 beq 1f
809 ACCOUNT_CPU_USER_EXIT(r10, r11)
810 ld r0,GPR13(r1)
811
812 1: stdcx. r0,0,r1 /* to clear the reservation */
813
814 ld r8,_CCR(r1)
815 ld r9,_LINK(r1)
816 ld r10,_CTR(r1)
817 ld r11,_XER(r1)
818 mtcr r8
819 mtlr r9
820 mtctr r10
821 mtxer r11
822 REST_2GPRS(8, r1)
823 ld r10,GPR10(r1)
824 ld r11,GPR11(r1)
825 ld r12,GPR12(r1)
826 mtspr SPRN_SPRG_GEN_SCRATCH,r0
827
828 std r10,PACA_EXGEN+EX_R10(r13);
829 std r11,PACA_EXGEN+EX_R11(r13);
830 ld r10,_NIP(r1)
831 ld r11,_MSR(r1)
832 ld r0,GPR0(r1)
833 ld r1,GPR1(r1)
834 mtspr SPRN_SRR0,r10
835 mtspr SPRN_SRR1,r11
836 ld r10,PACA_EXGEN+EX_R10(r13)
837 ld r11,PACA_EXGEN+EX_R11(r13)
838 mfspr r13,SPRN_SPRG_GEN_SCRATCH
839 rfi
840
841 /*
842 * Trampolines used when spotting a bad kernel stack pointer in
843 * the exception entry code.
844 *
845 * TODO: move some bits like SRR0 read to trampoline, pass PACA
846 * index around, etc... to handle crit & mcheck
847 */
848 BAD_STACK_TRAMPOLINE(0x000)
849 BAD_STACK_TRAMPOLINE(0x100)
850 BAD_STACK_TRAMPOLINE(0x200)
851 BAD_STACK_TRAMPOLINE(0x220)
852 BAD_STACK_TRAMPOLINE(0x260)
853 BAD_STACK_TRAMPOLINE(0x280)
854 BAD_STACK_TRAMPOLINE(0x2a0)
855 BAD_STACK_TRAMPOLINE(0x2c0)
856 BAD_STACK_TRAMPOLINE(0x2e0)
857 BAD_STACK_TRAMPOLINE(0x300)
858 BAD_STACK_TRAMPOLINE(0x310)
859 BAD_STACK_TRAMPOLINE(0x320)
860 BAD_STACK_TRAMPOLINE(0x400)
861 BAD_STACK_TRAMPOLINE(0x500)
862 BAD_STACK_TRAMPOLINE(0x600)
863 BAD_STACK_TRAMPOLINE(0x700)
864 BAD_STACK_TRAMPOLINE(0x800)
865 BAD_STACK_TRAMPOLINE(0x900)
866 BAD_STACK_TRAMPOLINE(0x980)
867 BAD_STACK_TRAMPOLINE(0x9f0)
868 BAD_STACK_TRAMPOLINE(0xa00)
869 BAD_STACK_TRAMPOLINE(0xb00)
870 BAD_STACK_TRAMPOLINE(0xc00)
871 BAD_STACK_TRAMPOLINE(0xd00)
872 BAD_STACK_TRAMPOLINE(0xd08)
873 BAD_STACK_TRAMPOLINE(0xe00)
874 BAD_STACK_TRAMPOLINE(0xf00)
875 BAD_STACK_TRAMPOLINE(0xf20)
876
877 .globl bad_stack_book3e
878 bad_stack_book3e:
879 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
880 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
881 ld r1,PACAEMERGSP(r13)
882 subi r1,r1,64+INT_FRAME_SIZE
883 std r10,_NIP(r1)
884 std r11,_MSR(r1)
885 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
886 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
887 std r10,GPR1(r1)
888 std r11,_CCR(r1)
889 mfspr r10,SPRN_DEAR
890 mfspr r11,SPRN_ESR
891 std r10,_DAR(r1)
892 std r11,_DSISR(r1)
893 std r0,GPR0(r1); /* save r0 in stackframe */ \
894 std r2,GPR2(r1); /* save r2 in stackframe */ \
895 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
896 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
897 std r9,GPR9(r1); /* save r9 in stackframe */ \
898 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
899 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
900 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
901 std r3,GPR10(r1); /* save r10 to stackframe */ \
902 std r4,GPR11(r1); /* save r11 to stackframe */ \
903 std r12,GPR12(r1); /* save r12 in stackframe */ \
904 std r5,GPR13(r1); /* save it to stackframe */ \
905 mflr r10
906 mfctr r11
907 mfxer r12
908 std r10,_LINK(r1)
909 std r11,_CTR(r1)
910 std r12,_XER(r1)
911 SAVE_10GPRS(14,r1)
912 SAVE_8GPRS(24,r1)
913 lhz r12,PACA_TRAP_SAVE(r13)
914 std r12,_TRAP(r1)
915 addi r11,r1,INT_FRAME_SIZE
916 std r11,0(r1)
917 li r12,0
918 std r12,0(r11)
919 ld r2,PACATOC(r13)
920 1: addi r3,r1,STACK_FRAME_OVERHEAD
921 bl .kernel_bad_stack
922 b 1b
923
924 /*
925 * Setup the initial TLB for a core. This current implementation
926 * assume that whatever we are running off will not conflict with
927 * the new mapping at PAGE_OFFSET.
928 */
929 _GLOBAL(initial_tlb_book3e)
930
931 /* Look for the first TLB with IPROT set */
932 mfspr r4,SPRN_TLB0CFG
933 andi. r3,r4,TLBnCFG_IPROT
934 lis r3,MAS0_TLBSEL(0)@h
935 bne found_iprot
936
937 mfspr r4,SPRN_TLB1CFG
938 andi. r3,r4,TLBnCFG_IPROT
939 lis r3,MAS0_TLBSEL(1)@h
940 bne found_iprot
941
942 mfspr r4,SPRN_TLB2CFG
943 andi. r3,r4,TLBnCFG_IPROT
944 lis r3,MAS0_TLBSEL(2)@h
945 bne found_iprot
946
947 lis r3,MAS0_TLBSEL(3)@h
948 mfspr r4,SPRN_TLB3CFG
949 /* fall through */
950
951 found_iprot:
952 andi. r5,r4,TLBnCFG_HES
953 bne have_hes
954
955 mflr r8 /* save LR */
956 /* 1. Find the index of the entry we're executing in
957 *
958 * r3 = MAS0_TLBSEL (for the iprot array)
959 * r4 = SPRN_TLBnCFG
960 */
961 bl invstr /* Find our address */
962 invstr: mflr r6 /* Make it accessible */
963 mfmsr r7
964 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
965 mfspr r7,SPRN_PID
966 slwi r7,r7,16
967 or r7,r7,r5
968 mtspr SPRN_MAS6,r7
969 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
970
971 mfspr r3,SPRN_MAS0
972 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
973
974 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
975 oris r7,r7,MAS1_IPROT@h
976 mtspr SPRN_MAS1,r7
977 tlbwe
978
979 /* 2. Invalidate all entries except the entry we're executing in
980 *
981 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
982 * r4 = SPRN_TLBnCFG
983 * r5 = ESEL of entry we are running in
984 */
985 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
986 li r6,0 /* Set Entry counter to 0 */
987 1: mr r7,r3 /* Set MAS0(TLBSEL) */
988 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
989 mtspr SPRN_MAS0,r7
990 tlbre
991 mfspr r7,SPRN_MAS1
992 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
993 cmpw r5,r6
994 beq skpinv /* Dont update the current execution TLB */
995 mtspr SPRN_MAS1,r7
996 tlbwe
997 isync
998 skpinv: addi r6,r6,1 /* Increment */
999 cmpw r6,r4 /* Are we done? */
1000 bne 1b /* If not, repeat */
1001
1002 /* Invalidate all TLBs */
1003 PPC_TLBILX_ALL(0,R0)
1004 sync
1005 isync
1006
1007 /* 3. Setup a temp mapping and jump to it
1008 *
1009 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1010 * r5 = ESEL of entry we are running in
1011 */
1012 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
1013 addi r7,r7,0x1
1014 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
1015 mtspr SPRN_MAS0,r4
1016 tlbre
1017
1018 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
1019 mtspr SPRN_MAS0,r4
1020
1021 mfspr r7,SPRN_MAS1
1022 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
1023 mtspr SPRN_MAS1,r6
1024
1025 tlbwe
1026
1027 mfmsr r6
1028 xori r6,r6,MSR_IS
1029 mtspr SPRN_SRR1,r6
1030 bl 1f /* Find our address */
1031 1: mflr r6
1032 addi r6,r6,(2f - 1b)
1033 mtspr SPRN_SRR0,r6
1034 rfi
1035 2:
1036
1037 /* 4. Clear out PIDs & Search info
1038 *
1039 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1040 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1041 * r5 = MAS3
1042 */
1043 li r6,0
1044 mtspr SPRN_MAS6,r6
1045 mtspr SPRN_PID,r6
1046
1047 /* 5. Invalidate mapping we started in
1048 *
1049 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1050 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1051 * r5 = MAS3
1052 */
1053 mtspr SPRN_MAS0,r3
1054 tlbre
1055 mfspr r6,SPRN_MAS1
1056 rlwinm r6,r6,0,2,0 /* clear IPROT */
1057 mtspr SPRN_MAS1,r6
1058 tlbwe
1059
1060 /* Invalidate TLB1 */
1061 PPC_TLBILX_ALL(0,R0)
1062 sync
1063 isync
1064
1065 /* The mapping only needs to be cache-coherent on SMP */
1066 #ifdef CONFIG_SMP
1067 #define M_IF_SMP MAS2_M
1068 #else
1069 #define M_IF_SMP 0
1070 #endif
1071
1072 /* 6. Setup KERNELBASE mapping in TLB[0]
1073 *
1074 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1075 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1076 * r5 = MAS3
1077 */
1078 rlwinm r3,r3,0,16,3 /* clear ESEL */
1079 mtspr SPRN_MAS0,r3
1080 lis r6,(MAS1_VALID|MAS1_IPROT)@h
1081 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
1082 mtspr SPRN_MAS1,r6
1083
1084 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_SMP)
1085 mtspr SPRN_MAS2,r6
1086
1087 rlwinm r5,r5,0,0,25
1088 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
1089 mtspr SPRN_MAS3,r5
1090 li r5,-1
1091 rlwinm r5,r5,0,0,25
1092
1093 tlbwe
1094
1095 /* 7. Jump to KERNELBASE mapping
1096 *
1097 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1098 */
1099 /* Now we branch the new virtual address mapped by this entry */
1100 LOAD_REG_IMMEDIATE(r6,2f)
1101 lis r7,MSR_KERNEL@h
1102 ori r7,r7,MSR_KERNEL@l
1103 mtspr SPRN_SRR0,r6
1104 mtspr SPRN_SRR1,r7
1105 rfi /* start execution out of TLB1[0] entry */
1106 2:
1107
1108 /* 8. Clear out the temp mapping
1109 *
1110 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1111 */
1112 mtspr SPRN_MAS0,r4
1113 tlbre
1114 mfspr r5,SPRN_MAS1
1115 rlwinm r5,r5,0,2,0 /* clear IPROT */
1116 mtspr SPRN_MAS1,r5
1117 tlbwe
1118
1119 /* Invalidate TLB1 */
1120 PPC_TLBILX_ALL(0,R0)
1121 sync
1122 isync
1123
1124 /* We translate LR and return */
1125 tovirt(r8,r8)
1126 mtlr r8
1127 blr
1128
1129 have_hes:
1130 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
1131 * kernel linear mapping. We also set MAS8 once for all here though
1132 * that will have to be made dependent on whether we are running under
1133 * a hypervisor I suppose.
1134 */
1135
1136 /* BEWARE, MAGIC
1137 * This code is called as an ordinary function on the boot CPU. But to
1138 * avoid duplication, this code is also used in SCOM bringup of
1139 * secondary CPUs. We read the code between the initial_tlb_code_start
1140 * and initial_tlb_code_end labels one instruction at a time and RAM it
1141 * into the new core via SCOM. That doesn't process branches, so there
1142 * must be none between those two labels. It also means if this code
1143 * ever takes any parameters, the SCOM code must also be updated to
1144 * provide them.
1145 */
1146 .globl a2_tlbinit_code_start
1147 a2_tlbinit_code_start:
1148
1149 ori r11,r3,MAS0_WQ_ALLWAYS
1150 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
1151 mtspr SPRN_MAS0,r11
1152 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1153 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
1154 mtspr SPRN_MAS1,r3
1155 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
1156 mtspr SPRN_MAS2,r3
1157 li r3,MAS3_SR | MAS3_SW | MAS3_SX
1158 mtspr SPRN_MAS7_MAS3,r3
1159 li r3,0
1160 mtspr SPRN_MAS8,r3
1161
1162 /* Write the TLB entry */
1163 tlbwe
1164
1165 .globl a2_tlbinit_after_linear_map
1166 a2_tlbinit_after_linear_map:
1167
1168 /* Now we branch the new virtual address mapped by this entry */
1169 LOAD_REG_IMMEDIATE(r3,1f)
1170 mtctr r3
1171 bctr
1172
1173 1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
1174 * else (including IPROTed things left by firmware)
1175 * r4 = TLBnCFG
1176 * r3 = current address (more or less)
1177 */
1178
1179 li r5,0
1180 mtspr SPRN_MAS6,r5
1181 tlbsx 0,r3
1182
1183 rlwinm r9,r4,0,TLBnCFG_N_ENTRY
1184 rlwinm r10,r4,8,0xff
1185 addi r10,r10,-1 /* Get inner loop mask */
1186
1187 li r3,1
1188
1189 mfspr r5,SPRN_MAS1
1190 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT))
1191
1192 mfspr r6,SPRN_MAS2
1193 rldicr r6,r6,0,51 /* Extract EPN */
1194
1195 mfspr r7,SPRN_MAS0
1196 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */
1197
1198 rlwinm r8,r7,16,0xfff /* Extract ESEL */
1199
1200 2: add r4,r3,r8
1201 and r4,r4,r10
1202
1203 rlwimi r7,r4,16,MAS0_ESEL_MASK
1204
1205 mtspr SPRN_MAS0,r7
1206 mtspr SPRN_MAS1,r5
1207 mtspr SPRN_MAS2,r6
1208 tlbwe
1209
1210 addi r3,r3,1
1211 and. r4,r3,r10
1212
1213 bne 3f
1214 addis r6,r6,(1<<30)@h
1215 3:
1216 cmpw r3,r9
1217 blt 2b
1218
1219 .globl a2_tlbinit_after_iprot_flush
1220 a2_tlbinit_after_iprot_flush:
1221
1222 #ifdef CONFIG_PPC_EARLY_DEBUG_WSP
1223 /* Now establish early debug mappings if applicable */
1224 /* Restore the MAS0 we used for linear mapping load */
1225 mtspr SPRN_MAS0,r11
1226
1227 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1228 ori r3,r3,(BOOK3E_PAGESZ_4K << MAS1_TSIZE_SHIFT)
1229 mtspr SPRN_MAS1,r3
1230 LOAD_REG_IMMEDIATE(r3, WSP_UART_VIRT | MAS2_I | MAS2_G)
1231 mtspr SPRN_MAS2,r3
1232 LOAD_REG_IMMEDIATE(r3, WSP_UART_PHYS | MAS3_SR | MAS3_SW)
1233 mtspr SPRN_MAS7_MAS3,r3
1234 /* re-use the MAS8 value from the linear mapping */
1235 tlbwe
1236 #endif /* CONFIG_PPC_EARLY_DEBUG_WSP */
1237
1238 PPC_TLBILX(0,0,R0)
1239 sync
1240 isync
1241
1242 .globl a2_tlbinit_code_end
1243 a2_tlbinit_code_end:
1244
1245 /* We translate LR and return */
1246 mflr r3
1247 tovirt(r3,r3)
1248 mtlr r3
1249 blr
1250
1251 /*
1252 * Main entry (boot CPU, thread 0)
1253 *
1254 * We enter here from head_64.S, possibly after the prom_init trampoline
1255 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
1256 * mode. Anything else is as it was left by the bootloader
1257 *
1258 * Initial requirements of this port:
1259 *
1260 * - Kernel loaded at 0 physical
1261 * - A good lump of memory mapped 0:0 by UTLB entry 0
1262 * - MSR:IS & MSR:DS set to 0
1263 *
1264 * Note that some of the above requirements will be relaxed in the future
1265 * as the kernel becomes smarter at dealing with different initial conditions
1266 * but for now you have to be careful
1267 */
1268 _GLOBAL(start_initialization_book3e)
1269 mflr r28
1270
1271 /* First, we need to setup some initial TLBs to map the kernel
1272 * text, data and bss at PAGE_OFFSET. We don't have a real mode
1273 * and always use AS 0, so we just set it up to match our link
1274 * address and never use 0 based addresses.
1275 */
1276 bl .initial_tlb_book3e
1277
1278 /* Init global core bits */
1279 bl .init_core_book3e
1280
1281 /* Init per-thread bits */
1282 bl .init_thread_book3e
1283
1284 /* Return to common init code */
1285 tovirt(r28,r28)
1286 mtlr r28
1287 blr
1288
1289
1290 /*
1291 * Secondary core/processor entry
1292 *
1293 * This is entered for thread 0 of a secondary core, all other threads
1294 * are expected to be stopped. It's similar to start_initialization_book3e
1295 * except that it's generally entered from the holding loop in head_64.S
1296 * after CPUs have been gathered by Open Firmware.
1297 *
1298 * We assume we are in 32 bits mode running with whatever TLB entry was
1299 * set for us by the firmware or POR engine.
1300 */
1301 _GLOBAL(book3e_secondary_core_init_tlb_set)
1302 li r4,1
1303 b .generic_secondary_smp_init
1304
1305 _GLOBAL(book3e_secondary_core_init)
1306 mflr r28
1307
1308 /* Do we need to setup initial TLB entry ? */
1309 cmplwi r4,0
1310 bne 2f
1311
1312 /* Setup TLB for this core */
1313 bl .initial_tlb_book3e
1314
1315 /* We can return from the above running at a different
1316 * address, so recalculate r2 (TOC)
1317 */
1318 bl .relative_toc
1319
1320 /* Init global core bits */
1321 2: bl .init_core_book3e
1322
1323 /* Init per-thread bits */
1324 3: bl .init_thread_book3e
1325
1326 /* Return to common init code at proper virtual address.
1327 *
1328 * Due to various previous assumptions, we know we entered this
1329 * function at either the final PAGE_OFFSET mapping or using a
1330 * 1:1 mapping at 0, so we don't bother doing a complicated check
1331 * here, we just ensure the return address has the right top bits.
1332 *
1333 * Note that if we ever want to be smarter about where we can be
1334 * started from, we have to be careful that by the time we reach
1335 * the code below we may already be running at a different location
1336 * than the one we were called from since initial_tlb_book3e can
1337 * have moved us already.
1338 */
1339 cmpdi cr0,r28,0
1340 blt 1f
1341 lis r3,PAGE_OFFSET@highest
1342 sldi r3,r3,32
1343 or r28,r28,r3
1344 1: mtlr r28
1345 blr
1346
1347 _GLOBAL(book3e_secondary_thread_init)
1348 mflr r28
1349 b 3b
1350
1351 _STATIC(init_core_book3e)
1352 /* Establish the interrupt vector base */
1353 LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
1354 mtspr SPRN_IVPR,r3
1355 sync
1356 blr
1357
1358 _STATIC(init_thread_book3e)
1359 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
1360 mtspr SPRN_EPCR,r3
1361
1362 /* Make sure interrupts are off */
1363 wrteei 0
1364
1365 /* disable all timers and clear out status */
1366 li r3,0
1367 mtspr SPRN_TCR,r3
1368 mfspr r3,SPRN_TSR
1369 mtspr SPRN_TSR,r3
1370
1371 blr
1372
1373 _GLOBAL(__setup_base_ivors)
1374 SET_IVOR(0, 0x020) /* Critical Input */
1375 SET_IVOR(1, 0x000) /* Machine Check */
1376 SET_IVOR(2, 0x060) /* Data Storage */
1377 SET_IVOR(3, 0x080) /* Instruction Storage */
1378 SET_IVOR(4, 0x0a0) /* External Input */
1379 SET_IVOR(5, 0x0c0) /* Alignment */
1380 SET_IVOR(6, 0x0e0) /* Program */
1381 SET_IVOR(7, 0x100) /* FP Unavailable */
1382 SET_IVOR(8, 0x120) /* System Call */
1383 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1384 SET_IVOR(10, 0x160) /* Decrementer */
1385 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1386 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1387 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1388 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1389 SET_IVOR(15, 0x040) /* Debug */
1390
1391 sync
1392
1393 blr
1394
1395 _GLOBAL(setup_altivec_ivors)
1396 SET_IVOR(32, 0x200) /* AltiVec Unavailable */
1397 SET_IVOR(33, 0x220) /* AltiVec Assist */
1398 blr
1399
1400 _GLOBAL(setup_perfmon_ivor)
1401 SET_IVOR(35, 0x260) /* Performance Monitor */
1402 blr
1403
1404 _GLOBAL(setup_doorbell_ivors)
1405 SET_IVOR(36, 0x280) /* Processor Doorbell */
1406 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */
1407 blr
1408
1409 _GLOBAL(setup_ehv_ivors)
1410 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */
1411 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */
1412 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */
1413 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */
1414 blr
Linux kernel - Deliverables
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