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 #define MASKABLE_EXCEPTION(trapnum, label, hdlr, ack) \
208 START_EXCEPTION(label); \
209 NORMAL_EXCEPTION_PROLOG(trapnum, PROLOG_ADDITION_MASKABLE) \
210 EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE_ALL) \
212 addi r3,r1,STACK_FRAME_OVERHEAD; \
214 b .ret_from_except_lite;
216 /* This value is used to mark exception frames on the stack. */
219 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
223 * And here we have the exception vectors !
228 .globl interrupt_base_book3e
229 interrupt_base_book3e: /* fake trap */
230 /* Note: If real debug exceptions are supported by the HW, the vector
231 * below will have to be patched up to point to an appropriate handler
233 EXCEPTION_STUB(0x000, machine_check) /* 0x0200 */
234 EXCEPTION_STUB(0x020, critical_input) /* 0x0580 */
235 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
236 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
237 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
238 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
239 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
240 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
241 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
242 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
243 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
244 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
245 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
246 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
247 EXCEPTION_STUB(0x1c0, data_tlb_miss)
248 EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
249 EXCEPTION_STUB(0x280, doorbell)
250 EXCEPTION_STUB(0x2a0, doorbell_crit)
252 .globl interrupt_end_book3e
253 interrupt_end_book3e:
255 /* Critical Input Interrupt */
256 START_EXCEPTION(critical_input);
257 CRIT_EXCEPTION_PROLOG(0x100, PROLOG_ADDITION_NONE)
258 // EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE_ALL)
259 // bl special_reg_save_crit
260 // addi r3,r1,STACK_FRAME_OVERHEAD
261 // bl .critical_exception
262 // b ret_from_crit_except
265 /* Machine Check Interrupt */
266 START_EXCEPTION(machine_check);
267 CRIT_EXCEPTION_PROLOG(0x200, PROLOG_ADDITION_NONE)
268 // EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE_ALL)
269 // bl special_reg_save_mc
270 // addi r3,r1,STACK_FRAME_OVERHEAD
271 // bl .machine_check_exception
272 // b ret_from_mc_except
275 /* Data Storage Interrupt */
276 START_EXCEPTION(data_storage)
277 NORMAL_EXCEPTION_PROLOG(0x300, PROLOG_ADDITION_2REGS)
280 EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_KEEP)
281 b storage_fault_common
283 /* Instruction Storage Interrupt */
284 START_EXCEPTION(instruction_storage);
285 NORMAL_EXCEPTION_PROLOG(0x400, PROLOG_ADDITION_2REGS)
288 EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_KEEP)
289 b storage_fault_common
291 /* External Input Interrupt */
292 MASKABLE_EXCEPTION(0x500, external_input, .do_IRQ, ACK_NONE)
295 START_EXCEPTION(alignment);
296 NORMAL_EXCEPTION_PROLOG(0x600, PROLOG_ADDITION_2REGS)
299 EXCEPTION_COMMON(0x600, PACA_EXGEN, INTS_KEEP)
300 b alignment_more /* no room, go out of line */
302 /* Program Interrupt */
303 START_EXCEPTION(program);
304 NORMAL_EXCEPTION_PROLOG(0x700, PROLOG_ADDITION_1REG)
306 EXCEPTION_COMMON(0x700, PACA_EXGEN, INTS_DISABLE_SOFT)
308 addi r3,r1,STACK_FRAME_OVERHEAD
309 ld r14,PACA_EXGEN+EX_R14(r13)
312 bl .program_check_exception
315 /* Floating Point Unavailable Interrupt */
316 START_EXCEPTION(fp_unavailable);
317 NORMAL_EXCEPTION_PROLOG(0x800, PROLOG_ADDITION_NONE)
318 /* we can probably do a shorter exception entry for that one... */
319 EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP)
320 bne 1f /* if from user, just load it up */
322 addi r3,r1,STACK_FRAME_OVERHEAD
324 bl .kernel_fp_unavailable_exception
328 b fast_exception_return
330 /* Decrementer Interrupt */
331 MASKABLE_EXCEPTION(0x900, decrementer, .timer_interrupt, ACK_DEC)
333 /* Fixed Interval Timer Interrupt */
334 MASKABLE_EXCEPTION(0x980, fixed_interval, .unknown_exception, ACK_FIT)
336 /* Watchdog Timer Interrupt */
337 START_EXCEPTION(watchdog);
338 CRIT_EXCEPTION_PROLOG(0x9f0, PROLOG_ADDITION_NONE)
339 // EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE_ALL)
340 // bl special_reg_save_crit
341 // addi r3,r1,STACK_FRAME_OVERHEAD
342 // bl .unknown_exception
343 // b ret_from_crit_except
346 /* System Call Interrupt */
347 START_EXCEPTION(system_call)
348 mr r9,r13 /* keep a copy of userland r13 */
349 mfspr r11,SPRN_SRR0 /* get return address */
350 mfspr r12,SPRN_SRR1 /* get previous MSR */
351 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
354 /* Auxillary Processor Unavailable Interrupt */
355 START_EXCEPTION(ap_unavailable);
356 NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE)
357 EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_KEEP)
358 addi r3,r1,STACK_FRAME_OVERHEAD
361 bl .unknown_exception
364 /* Debug exception as a critical interrupt*/
365 START_EXCEPTION(debug_crit);
366 CRIT_EXCEPTION_PROLOG(0xd00, PROLOG_ADDITION_2REGS)
369 * If there is a single step or branch-taken exception in an
370 * exception entry sequence, it was probably meant to apply to
371 * the code where the exception occurred (since exception entry
372 * doesn't turn off DE automatically). We simulate the effect
373 * of turning off DE on entry to an exception handler by turning
374 * off DE in the CSRR1 value and clearing the debug status.
377 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
378 andis. r15,r14,DBSR_IC@h
381 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
382 LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
388 /* here it looks like we got an inappropriate debug exception. */
389 lis r14,DBSR_IC@h /* clear the IC event */
390 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
393 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
394 ld r1,PACA_EXCRIT+EX_R1(r13)
395 ld r14,PACA_EXCRIT+EX_R14(r13)
396 ld r15,PACA_EXCRIT+EX_R15(r13)
398 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
399 ld r11,PACA_EXCRIT+EX_R11(r13)
400 mfspr r13,SPRN_SPRG_CRIT_SCRATCH
403 /* Normal debug exception */
404 /* XXX We only handle coming from userspace for now since we can't
405 * quite save properly an interrupted kernel state yet
407 1: andi. r14,r11,MSR_PR; /* check for userspace again */
408 beq kernel_dbg_exc; /* if from kernel mode */
410 /* Now we mash up things to make it look like we are coming on a
413 mfspr r15,SPRN_SPRG_CRIT_SCRATCH
414 mtspr SPRN_SPRG_GEN_SCRATCH,r15
416 EXCEPTION_COMMON(0xd00, PACA_EXCRIT, INTS_DISABLE_ALL)
418 addi r3,r1,STACK_FRAME_OVERHEAD
420 ld r14,PACA_EXCRIT+EX_R14(r13)
421 ld r15,PACA_EXCRIT+EX_R15(r13)
429 /* Doorbell interrupt */
430 MASKABLE_EXCEPTION(0x2070, doorbell, .doorbell_exception, ACK_NONE)
432 /* Doorbell critical Interrupt */
433 START_EXCEPTION(doorbell_crit);
434 CRIT_EXCEPTION_PROLOG(0x2080, PROLOG_ADDITION_NONE)
435 // EXCEPTION_COMMON(0x2080, PACA_EXCRIT, INTS_DISABLE_ALL)
436 // bl special_reg_save_crit
437 // addi r3,r1,STACK_FRAME_OVERHEAD
438 // bl .doorbell_critical_exception
439 // b ret_from_crit_except
444 * An interrupt came in while soft-disabled; clear EE in SRR1,
445 * clear paca->hard_enabled and return.
447 masked_interrupt_book3e:
449 stb r11,PACAHARDIRQEN(r13)
451 rldicl r11,r10,48,1 /* clear MSR_EE */
454 ld r10,PACA_EXGEN+EX_R10(r13); /* restore registers */
455 ld r11,PACA_EXGEN+EX_R11(r13);
456 mfspr r13,SPRN_SPRG_GEN_SCRATCH;
461 * This is called from 0x300 and 0x400 handlers after the prologs with
462 * r14 and r15 containing the fault address and error code, with the
463 * original values stashed away in the PACA
465 storage_fault_common:
468 addi r3,r1,STACK_FRAME_OVERHEAD
471 ld r14,PACA_EXGEN+EX_R14(r13)
472 ld r15,PACA_EXGEN+EX_R15(r13)
477 b .ret_from_except_lite
480 addi r3,r1,STACK_FRAME_OVERHEAD
486 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
492 addi r3,r1,STACK_FRAME_OVERHEAD
493 ld r14,PACA_EXGEN+EX_R14(r13)
494 ld r15,PACA_EXGEN+EX_R15(r13)
497 bl .alignment_exception
501 * We branch here from entry_64.S for the last stage of the exception
502 * return code path. MSR:EE is expected to be off at that point
504 _GLOBAL(exception_return_book3e)
507 /* This is the return from load_up_fpu fast path which could do with
508 * less GPR restores in fact, but for now we have a single return path
510 .globl fast_exception_return
511 fast_exception_return:
519 ACCOUNT_CPU_USER_EXIT(r10, r11)
522 1: stdcx. r0,0,r1 /* to clear the reservation */
536 mtspr SPRN_SPRG_GEN_SCRATCH,r0
538 std r10,PACA_EXGEN+EX_R10(r13);
539 std r11,PACA_EXGEN+EX_R11(r13);
546 ld r10,PACA_EXGEN+EX_R10(r13)
547 ld r11,PACA_EXGEN+EX_R11(r13)
548 mfspr r13,SPRN_SPRG_GEN_SCRATCH
552 * Trampolines used when spotting a bad kernel stack pointer in
553 * the exception entry code.
555 * TODO: move some bits like SRR0 read to trampoline, pass PACA
556 * index around, etc... to handle crit & mcheck
558 BAD_STACK_TRAMPOLINE(0x000)
559 BAD_STACK_TRAMPOLINE(0x100)
560 BAD_STACK_TRAMPOLINE(0x200)
561 BAD_STACK_TRAMPOLINE(0x300)
562 BAD_STACK_TRAMPOLINE(0x400)
563 BAD_STACK_TRAMPOLINE(0x500)
564 BAD_STACK_TRAMPOLINE(0x600)
565 BAD_STACK_TRAMPOLINE(0x700)
566 BAD_STACK_TRAMPOLINE(0x800)
567 BAD_STACK_TRAMPOLINE(0x900)
568 BAD_STACK_TRAMPOLINE(0x980)
569 BAD_STACK_TRAMPOLINE(0x9f0)
570 BAD_STACK_TRAMPOLINE(0xa00)
571 BAD_STACK_TRAMPOLINE(0xb00)
572 BAD_STACK_TRAMPOLINE(0xc00)
573 BAD_STACK_TRAMPOLINE(0xd00)
574 BAD_STACK_TRAMPOLINE(0xe00)
575 BAD_STACK_TRAMPOLINE(0xf00)
576 BAD_STACK_TRAMPOLINE(0xf20)
577 BAD_STACK_TRAMPOLINE(0x2070)
578 BAD_STACK_TRAMPOLINE(0x2080)
580 .globl bad_stack_book3e
582 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
583 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
584 ld r1,PACAEMERGSP(r13)
585 subi r1,r1,64+INT_FRAME_SIZE
588 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
589 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
596 std r0,GPR0(r1); /* save r0 in stackframe */ \
597 std r2,GPR2(r1); /* save r2 in stackframe */ \
598 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
599 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
600 std r9,GPR9(r1); /* save r9 in stackframe */ \
601 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
602 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
603 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
604 std r3,GPR10(r1); /* save r10 to stackframe */ \
605 std r4,GPR11(r1); /* save r11 to stackframe */ \
606 std r12,GPR12(r1); /* save r12 in stackframe */ \
607 std r5,GPR13(r1); /* save it to stackframe */ \
616 lhz r12,PACA_TRAP_SAVE(r13)
618 addi r11,r1,INT_FRAME_SIZE
623 1: addi r3,r1,STACK_FRAME_OVERHEAD
628 * Setup the initial TLB for a core. This current implementation
629 * assume that whatever we are running off will not conflict with
630 * the new mapping at PAGE_OFFSET.
632 _GLOBAL(initial_tlb_book3e)
634 /* Look for the first TLB with IPROT set */
635 mfspr r4,SPRN_TLB0CFG
636 andi. r3,r4,TLBnCFG_IPROT
637 lis r3,MAS0_TLBSEL(0)@h
640 mfspr r4,SPRN_TLB1CFG
641 andi. r3,r4,TLBnCFG_IPROT
642 lis r3,MAS0_TLBSEL(1)@h
645 mfspr r4,SPRN_TLB2CFG
646 andi. r3,r4,TLBnCFG_IPROT
647 lis r3,MAS0_TLBSEL(2)@h
650 lis r3,MAS0_TLBSEL(3)@h
651 mfspr r4,SPRN_TLB3CFG
655 andi. r5,r4,TLBnCFG_HES
658 mflr r8 /* save LR */
659 /* 1. Find the index of the entry we're executing in
661 * r3 = MAS0_TLBSEL (for the iprot array)
664 bl invstr /* Find our address */
665 invstr: mflr r6 /* Make it accessible */
667 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
672 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
675 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
677 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
678 oris r7,r7,MAS1_IPROT@h
682 /* 2. Invalidate all entries except the entry we're executing in
684 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
686 * r5 = ESEL of entry we are running in
688 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
689 li r6,0 /* Set Entry counter to 0 */
690 1: mr r7,r3 /* Set MAS0(TLBSEL) */
691 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
695 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
697 beq skpinv /* Dont update the current execution TLB */
701 skpinv: addi r6,r6,1 /* Increment */
702 cmpw r6,r4 /* Are we done? */
703 bne 1b /* If not, repeat */
705 /* Invalidate all TLBs */
710 /* 3. Setup a temp mapping and jump to it
712 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
713 * r5 = ESEL of entry we are running in
715 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
717 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
721 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
725 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
733 bl 1f /* Find our address */
740 /* 4. Clear out PIDs & Search info
742 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
743 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
750 /* 5. Invalidate mapping we started in
752 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
753 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
759 rlwinm r6,r6,0,2,0 /* clear IPROT */
763 /* Invalidate TLB1 */
768 /* The mapping only needs to be cache-coherent on SMP */
770 #define M_IF_SMP MAS2_M
775 /* 6. Setup KERNELBASE mapping in TLB[0]
777 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
778 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
781 rlwinm r3,r3,0,16,3 /* clear ESEL */
783 lis r6,(MAS1_VALID|MAS1_IPROT)@h
784 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
787 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_SMP)
791 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
798 /* 7. Jump to KERNELBASE mapping
800 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
802 /* Now we branch the new virtual address mapped by this entry */
803 LOAD_REG_IMMEDIATE(r6,2f)
805 ori r7,r7,MSR_KERNEL@l
808 rfi /* start execution out of TLB1[0] entry */
811 /* 8. Clear out the temp mapping
813 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
818 rlwinm r5,r5,0,2,0 /* clear IPROT */
822 /* Invalidate TLB1 */
827 /* We translate LR and return */
833 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
834 * kernel linear mapping. We also set MAS8 once for all here though
835 * that will have to be made dependent on whether we are running under
836 * a hypervisor I suppose.
838 ori r3,r3,MAS0_HES | MAS0_WQ_ALLWAYS
840 lis r3,(MAS1_VALID | MAS1_IPROT)@h
841 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
843 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
845 li r3,MAS3_SR | MAS3_SW | MAS3_SX
846 mtspr SPRN_MAS7_MAS3,r3
850 /* Write the TLB entry */
853 /* Now we branch the new virtual address mapped by this entry */
854 LOAD_REG_IMMEDIATE(r3,1f)
858 1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
859 * else (XXX we should scan for bolted crap from the firmware too)
865 /* We translate LR and return */
872 * Main entry (boot CPU, thread 0)
874 * We enter here from head_64.S, possibly after the prom_init trampoline
875 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
876 * mode. Anything else is as it was left by the bootloader
878 * Initial requirements of this port:
880 * - Kernel loaded at 0 physical
881 * - A good lump of memory mapped 0:0 by UTLB entry 0
882 * - MSR:IS & MSR:DS set to 0
884 * Note that some of the above requirements will be relaxed in the future
885 * as the kernel becomes smarter at dealing with different initial conditions
886 * but for now you have to be careful
888 _GLOBAL(start_initialization_book3e)
891 /* First, we need to setup some initial TLBs to map the kernel
892 * text, data and bss at PAGE_OFFSET. We don't have a real mode
893 * and always use AS 0, so we just set it up to match our link
894 * address and never use 0 based addresses.
896 bl .initial_tlb_book3e
898 /* Init global core bits */
901 /* Init per-thread bits */
902 bl .init_thread_book3e
904 /* Return to common init code */
911 * Secondary core/processor entry
913 * This is entered for thread 0 of a secondary core, all other threads
914 * are expected to be stopped. It's similar to start_initialization_book3e
915 * except that it's generally entered from the holding loop in head_64.S
916 * after CPUs have been gathered by Open Firmware.
918 * We assume we are in 32 bits mode running with whatever TLB entry was
919 * set for us by the firmware or POR engine.
921 _GLOBAL(book3e_secondary_core_init_tlb_set)
923 b .generic_secondary_smp_init
925 _GLOBAL(book3e_secondary_core_init)
928 /* Do we need to setup initial TLB entry ? */
932 /* Setup TLB for this core */
933 bl .initial_tlb_book3e
935 /* We can return from the above running at a different
936 * address, so recalculate r2 (TOC)
940 /* Init global core bits */
941 2: bl .init_core_book3e
943 /* Init per-thread bits */
944 3: bl .init_thread_book3e
946 /* Return to common init code at proper virtual address.
948 * Due to various previous assumptions, we know we entered this
949 * function at either the final PAGE_OFFSET mapping or using a
950 * 1:1 mapping at 0, so we don't bother doing a complicated check
951 * here, we just ensure the return address has the right top bits.
953 * Note that if we ever want to be smarter about where we can be
954 * started from, we have to be careful that by the time we reach
955 * the code below we may already be running at a different location
956 * than the one we were called from since initial_tlb_book3e can
957 * have moved us already.
961 lis r3,PAGE_OFFSET@highest
967 _GLOBAL(book3e_secondary_thread_init)
971 _STATIC(init_core_book3e)
972 /* Establish the interrupt vector base */
973 LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
978 _STATIC(init_thread_book3e)
979 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
982 /* Make sure interrupts are off */
985 /* disable all timers and clear out status */
993 _GLOBAL(__setup_base_ivors)
994 SET_IVOR(0, 0x020) /* Critical Input */
995 SET_IVOR(1, 0x000) /* Machine Check */
996 SET_IVOR(2, 0x060) /* Data Storage */
997 SET_IVOR(3, 0x080) /* Instruction Storage */
998 SET_IVOR(4, 0x0a0) /* External Input */
999 SET_IVOR(5, 0x0c0) /* Alignment */
1000 SET_IVOR(6, 0x0e0) /* Program */
1001 SET_IVOR(7, 0x100) /* FP Unavailable */
1002 SET_IVOR(8, 0x120) /* System Call */
1003 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1004 SET_IVOR(10, 0x160) /* Decrementer */
1005 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1006 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1007 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1008 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1009 SET_IVOR(15, 0x040) /* Debug */