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Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[deliverable/linux.git] / arch / powerpc / kernel / head_64.S
1 /*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
6 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
7 * Adapted for Power Macintosh by Paul Mackerras.
8 * Low-level exception handlers and MMU support
9 * rewritten by Paul Mackerras.
10 * Copyright (C) 1996 Paul Mackerras.
11 *
12 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
13 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
14 *
15 * This file contains the low-level support and setup for the
16 * PowerPC-64 platform, including trap and interrupt dispatch.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/config.h>
25 #include <linux/threads.h>
26 #include <asm/reg.h>
27 #include <asm/page.h>
28 #include <asm/mmu.h>
29 #include <asm/ppc_asm.h>
30 #include <asm/asm-offsets.h>
31 #include <asm/bug.h>
32 #include <asm/cputable.h>
33 #include <asm/setup.h>
34 #include <asm/hvcall.h>
35 #include <asm/iseries/lpar_map.h>
36 #include <asm/thread_info.h>
37
38 #ifdef CONFIG_PPC_ISERIES
39 #define DO_SOFT_DISABLE
40 #endif
41
42 /*
43 * We layout physical memory as follows:
44 * 0x0000 - 0x00ff : Secondary processor spin code
45 * 0x0100 - 0x2fff : pSeries Interrupt prologs
46 * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs
47 * 0x6000 - 0x6fff : Initial (CPU0) segment table
48 * 0x7000 - 0x7fff : FWNMI data area
49 * 0x8000 - : Early init and support code
50 */
51
52 /*
53 * SPRG Usage
54 *
55 * Register Definition
56 *
57 * SPRG0 reserved for hypervisor
58 * SPRG1 temp - used to save gpr
59 * SPRG2 temp - used to save gpr
60 * SPRG3 virt addr of paca
61 */
62
63 /*
64 * Entering into this code we make the following assumptions:
65 * For pSeries:
66 * 1. The MMU is off & open firmware is running in real mode.
67 * 2. The kernel is entered at __start
68 *
69 * For iSeries:
70 * 1. The MMU is on (as it always is for iSeries)
71 * 2. The kernel is entered at system_reset_iSeries
72 */
73
74 .text
75 .globl _stext
76 _stext:
77 #ifdef CONFIG_PPC_MULTIPLATFORM
78 _GLOBAL(__start)
79 /* NOP this out unconditionally */
80 BEGIN_FTR_SECTION
81 b .__start_initialization_multiplatform
82 END_FTR_SECTION(0, 1)
83 #endif /* CONFIG_PPC_MULTIPLATFORM */
84
85 /* Catch branch to 0 in real mode */
86 trap
87
88 #ifdef CONFIG_PPC_ISERIES
89 /*
90 * At offset 0x20, there is a pointer to iSeries LPAR data.
91 * This is required by the hypervisor
92 */
93 . = 0x20
94 .llong hvReleaseData-KERNELBASE
95
96 /*
97 * At offset 0x28 and 0x30 are offsets to the mschunks_map
98 * array (used by the iSeries LPAR debugger to do translation
99 * between physical addresses and absolute addresses) and
100 * to the pidhash table (also used by the debugger)
101 */
102 .llong mschunks_map-KERNELBASE
103 .llong 0 /* pidhash-KERNELBASE SFRXXX */
104
105 /* Offset 0x38 - Pointer to start of embedded System.map */
106 .globl embedded_sysmap_start
107 embedded_sysmap_start:
108 .llong 0
109 /* Offset 0x40 - Pointer to end of embedded System.map */
110 .globl embedded_sysmap_end
111 embedded_sysmap_end:
112 .llong 0
113
114 #endif /* CONFIG_PPC_ISERIES */
115
116 /* Secondary processors spin on this value until it goes to 1. */
117 .globl __secondary_hold_spinloop
118 __secondary_hold_spinloop:
119 .llong 0x0
120
121 /* Secondary processors write this value with their cpu # */
122 /* after they enter the spin loop immediately below. */
123 .globl __secondary_hold_acknowledge
124 __secondary_hold_acknowledge:
125 .llong 0x0
126
127 . = 0x60
128 /*
129 * The following code is used on pSeries to hold secondary processors
130 * in a spin loop after they have been freed from OpenFirmware, but
131 * before the bulk of the kernel has been relocated. This code
132 * is relocated to physical address 0x60 before prom_init is run.
133 * All of it must fit below the first exception vector at 0x100.
134 */
135 _GLOBAL(__secondary_hold)
136 mfmsr r24
137 ori r24,r24,MSR_RI
138 mtmsrd r24 /* RI on */
139
140 /* Grab our physical cpu number */
141 mr r24,r3
142
143 /* Tell the master cpu we're here */
144 /* Relocation is off & we are located at an address less */
145 /* than 0x100, so only need to grab low order offset. */
146 std r24,__secondary_hold_acknowledge@l(0)
147 sync
148
149 /* All secondary cpus wait here until told to start. */
150 100: ld r4,__secondary_hold_spinloop@l(0)
151 cmpdi 0,r4,1
152 bne 100b
153
154 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
155 LOAD_REG_IMMEDIATE(r4, .pSeries_secondary_smp_init)
156 mtctr r4
157 mr r3,r24
158 bctr
159 #else
160 BUG_OPCODE
161 #endif
162
163 /* This value is used to mark exception frames on the stack. */
164 .section ".toc","aw"
165 exception_marker:
166 .tc ID_72656773_68657265[TC],0x7265677368657265
167 .text
168
169 /*
170 * The following macros define the code that appears as
171 * the prologue to each of the exception handlers. They
172 * are split into two parts to allow a single kernel binary
173 * to be used for pSeries and iSeries.
174 * LOL. One day... - paulus
175 */
176
177 /*
178 * We make as much of the exception code common between native
179 * exception handlers (including pSeries LPAR) and iSeries LPAR
180 * implementations as possible.
181 */
182
183 /*
184 * This is the start of the interrupt handlers for pSeries
185 * This code runs with relocation off.
186 */
187 #define EX_R9 0
188 #define EX_R10 8
189 #define EX_R11 16
190 #define EX_R12 24
191 #define EX_R13 32
192 #define EX_SRR0 40
193 #define EX_DAR 48
194 #define EX_DSISR 56
195 #define EX_CCR 60
196 #define EX_R3 64
197 #define EX_LR 72
198
199 /*
200 * We're short on space and time in the exception prolog, so we can't
201 * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
202 * low halfword of the address, but for Kdump we need the whole low
203 * word.
204 */
205 #ifdef CONFIG_CRASH_DUMP
206 #define LOAD_HANDLER(reg, label) \
207 oris reg,reg,(label)@h; /* virt addr of handler ... */ \
208 ori reg,reg,(label)@l; /* .. and the rest */
209 #else
210 #define LOAD_HANDLER(reg, label) \
211 ori reg,reg,(label)@l; /* virt addr of handler ... */
212 #endif
213
214 #define EXCEPTION_PROLOG_PSERIES(area, label) \
215 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
216 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
217 std r10,area+EX_R10(r13); \
218 std r11,area+EX_R11(r13); \
219 std r12,area+EX_R12(r13); \
220 mfspr r9,SPRN_SPRG1; \
221 std r9,area+EX_R13(r13); \
222 mfcr r9; \
223 clrrdi r12,r13,32; /* get high part of &label */ \
224 mfmsr r10; \
225 mfspr r11,SPRN_SRR0; /* save SRR0 */ \
226 LOAD_HANDLER(r12,label) \
227 ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
228 mtspr SPRN_SRR0,r12; \
229 mfspr r12,SPRN_SRR1; /* and SRR1 */ \
230 mtspr SPRN_SRR1,r10; \
231 rfid; \
232 b . /* prevent speculative execution */
233
234 /*
235 * This is the start of the interrupt handlers for iSeries
236 * This code runs with relocation on.
237 */
238 #define EXCEPTION_PROLOG_ISERIES_1(area) \
239 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
240 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
241 std r10,area+EX_R10(r13); \
242 std r11,area+EX_R11(r13); \
243 std r12,area+EX_R12(r13); \
244 mfspr r9,SPRN_SPRG1; \
245 std r9,area+EX_R13(r13); \
246 mfcr r9
247
248 #define EXCEPTION_PROLOG_ISERIES_2 \
249 mfmsr r10; \
250 ld r12,PACALPPACAPTR(r13); \
251 ld r11,LPPACASRR0(r12); \
252 ld r12,LPPACASRR1(r12); \
253 ori r10,r10,MSR_RI; \
254 mtmsrd r10,1
255
256 /*
257 * The common exception prolog is used for all except a few exceptions
258 * such as a segment miss on a kernel address. We have to be prepared
259 * to take another exception from the point where we first touch the
260 * kernel stack onwards.
261 *
262 * On entry r13 points to the paca, r9-r13 are saved in the paca,
263 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
264 * SRR1, and relocation is on.
265 */
266 #define EXCEPTION_PROLOG_COMMON(n, area) \
267 andi. r10,r12,MSR_PR; /* See if coming from user */ \
268 mr r10,r1; /* Save r1 */ \
269 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
270 beq- 1f; \
271 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
272 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
273 bge- cr1,bad_stack; /* abort if it is */ \
274 std r9,_CCR(r1); /* save CR in stackframe */ \
275 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
276 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
277 std r10,0(r1); /* make stack chain pointer */ \
278 std r0,GPR0(r1); /* save r0 in stackframe */ \
279 std r10,GPR1(r1); /* save r1 in stackframe */ \
280 ACCOUNT_CPU_USER_ENTRY(r9, r10); \
281 std r2,GPR2(r1); /* save r2 in stackframe */ \
282 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
283 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
284 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
285 ld r10,area+EX_R10(r13); \
286 std r9,GPR9(r1); \
287 std r10,GPR10(r1); \
288 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
289 ld r10,area+EX_R12(r13); \
290 ld r11,area+EX_R13(r13); \
291 std r9,GPR11(r1); \
292 std r10,GPR12(r1); \
293 std r11,GPR13(r1); \
294 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
295 mflr r9; /* save LR in stackframe */ \
296 std r9,_LINK(r1); \
297 mfctr r10; /* save CTR in stackframe */ \
298 std r10,_CTR(r1); \
299 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
300 std r11,_XER(r1); \
301 li r9,(n)+1; \
302 std r9,_TRAP(r1); /* set trap number */ \
303 li r10,0; \
304 ld r11,exception_marker@toc(r2); \
305 std r10,RESULT(r1); /* clear regs->result */ \
306 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
307
308 /*
309 * Exception vectors.
310 */
311 #define STD_EXCEPTION_PSERIES(n, label) \
312 . = n; \
313 .globl label##_pSeries; \
314 label##_pSeries: \
315 HMT_MEDIUM; \
316 mtspr SPRN_SPRG1,r13; /* save r13 */ \
317 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
318
319 #define STD_EXCEPTION_ISERIES(n, label, area) \
320 .globl label##_iSeries; \
321 label##_iSeries: \
322 HMT_MEDIUM; \
323 mtspr SPRN_SPRG1,r13; /* save r13 */ \
324 EXCEPTION_PROLOG_ISERIES_1(area); \
325 EXCEPTION_PROLOG_ISERIES_2; \
326 b label##_common
327
328 #define MASKABLE_EXCEPTION_ISERIES(n, label) \
329 .globl label##_iSeries; \
330 label##_iSeries: \
331 HMT_MEDIUM; \
332 mtspr SPRN_SPRG1,r13; /* save r13 */ \
333 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
334 lbz r10,PACAPROCENABLED(r13); \
335 cmpwi 0,r10,0; \
336 beq- label##_iSeries_masked; \
337 EXCEPTION_PROLOG_ISERIES_2; \
338 b label##_common; \
339
340 #ifdef DO_SOFT_DISABLE
341 #define DISABLE_INTS \
342 lbz r10,PACAPROCENABLED(r13); \
343 li r11,0; \
344 std r10,SOFTE(r1); \
345 mfmsr r10; \
346 stb r11,PACAPROCENABLED(r13); \
347 ori r10,r10,MSR_EE; \
348 mtmsrd r10,1
349
350 #define ENABLE_INTS \
351 lbz r10,PACAPROCENABLED(r13); \
352 mfmsr r11; \
353 std r10,SOFTE(r1); \
354 ori r11,r11,MSR_EE; \
355 mtmsrd r11,1
356
357 #else /* hard enable/disable interrupts */
358 #define DISABLE_INTS
359
360 #define ENABLE_INTS \
361 ld r12,_MSR(r1); \
362 mfmsr r11; \
363 rlwimi r11,r12,0,MSR_EE; \
364 mtmsrd r11,1
365
366 #endif
367
368 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
369 .align 7; \
370 .globl label##_common; \
371 label##_common: \
372 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
373 DISABLE_INTS; \
374 bl .save_nvgprs; \
375 addi r3,r1,STACK_FRAME_OVERHEAD; \
376 bl hdlr; \
377 b .ret_from_except
378
379 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
380 .align 7; \
381 .globl label##_common; \
382 label##_common: \
383 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
384 DISABLE_INTS; \
385 bl .ppc64_runlatch_on; \
386 addi r3,r1,STACK_FRAME_OVERHEAD; \
387 bl hdlr; \
388 b .ret_from_except_lite
389
390 /*
391 * Start of pSeries system interrupt routines
392 */
393 . = 0x100
394 .globl __start_interrupts
395 __start_interrupts:
396
397 STD_EXCEPTION_PSERIES(0x100, system_reset)
398
399 . = 0x200
400 _machine_check_pSeries:
401 HMT_MEDIUM
402 mtspr SPRN_SPRG1,r13 /* save r13 */
403 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
404
405 . = 0x300
406 .globl data_access_pSeries
407 data_access_pSeries:
408 HMT_MEDIUM
409 mtspr SPRN_SPRG1,r13
410 BEGIN_FTR_SECTION
411 mtspr SPRN_SPRG2,r12
412 mfspr r13,SPRN_DAR
413 mfspr r12,SPRN_DSISR
414 srdi r13,r13,60
415 rlwimi r13,r12,16,0x20
416 mfcr r12
417 cmpwi r13,0x2c
418 beq .do_stab_bolted_pSeries
419 mtcrf 0x80,r12
420 mfspr r12,SPRN_SPRG2
421 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
422 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
423
424 . = 0x380
425 .globl data_access_slb_pSeries
426 data_access_slb_pSeries:
427 HMT_MEDIUM
428 mtspr SPRN_SPRG1,r13
429 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
430 std r3,PACA_EXSLB+EX_R3(r13)
431 mfspr r3,SPRN_DAR
432 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
433 mfcr r9
434 #ifdef __DISABLED__
435 /* Keep that around for when we re-implement dynamic VSIDs */
436 cmpdi r3,0
437 bge slb_miss_user_pseries
438 #endif /* __DISABLED__ */
439 std r10,PACA_EXSLB+EX_R10(r13)
440 std r11,PACA_EXSLB+EX_R11(r13)
441 std r12,PACA_EXSLB+EX_R12(r13)
442 mfspr r10,SPRN_SPRG1
443 std r10,PACA_EXSLB+EX_R13(r13)
444 mfspr r12,SPRN_SRR1 /* and SRR1 */
445 b .slb_miss_realmode /* Rel. branch works in real mode */
446
447 STD_EXCEPTION_PSERIES(0x400, instruction_access)
448
449 . = 0x480
450 .globl instruction_access_slb_pSeries
451 instruction_access_slb_pSeries:
452 HMT_MEDIUM
453 mtspr SPRN_SPRG1,r13
454 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
455 std r3,PACA_EXSLB+EX_R3(r13)
456 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
457 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
458 mfcr r9
459 #ifdef __DISABLED__
460 /* Keep that around for when we re-implement dynamic VSIDs */
461 cmpdi r3,0
462 bge slb_miss_user_pseries
463 #endif /* __DISABLED__ */
464 std r10,PACA_EXSLB+EX_R10(r13)
465 std r11,PACA_EXSLB+EX_R11(r13)
466 std r12,PACA_EXSLB+EX_R12(r13)
467 mfspr r10,SPRN_SPRG1
468 std r10,PACA_EXSLB+EX_R13(r13)
469 mfspr r12,SPRN_SRR1 /* and SRR1 */
470 b .slb_miss_realmode /* Rel. branch works in real mode */
471
472 STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
473 STD_EXCEPTION_PSERIES(0x600, alignment)
474 STD_EXCEPTION_PSERIES(0x700, program_check)
475 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
476 STD_EXCEPTION_PSERIES(0x900, decrementer)
477 STD_EXCEPTION_PSERIES(0xa00, trap_0a)
478 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
479
480 . = 0xc00
481 .globl system_call_pSeries
482 system_call_pSeries:
483 HMT_MEDIUM
484 mr r9,r13
485 mfmsr r10
486 mfspr r13,SPRN_SPRG3
487 mfspr r11,SPRN_SRR0
488 clrrdi r12,r13,32
489 oris r12,r12,system_call_common@h
490 ori r12,r12,system_call_common@l
491 mtspr SPRN_SRR0,r12
492 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
493 mfspr r12,SPRN_SRR1
494 mtspr SPRN_SRR1,r10
495 rfid
496 b . /* prevent speculative execution */
497
498 STD_EXCEPTION_PSERIES(0xd00, single_step)
499 STD_EXCEPTION_PSERIES(0xe00, trap_0e)
500
501 /* We need to deal with the Altivec unavailable exception
502 * here which is at 0xf20, thus in the middle of the
503 * prolog code of the PerformanceMonitor one. A little
504 * trickery is thus necessary
505 */
506 . = 0xf00
507 b performance_monitor_pSeries
508
509 STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
510
511 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
512 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
513
514 . = 0x3000
515
516 /*** pSeries interrupt support ***/
517
518 /* moved from 0xf00 */
519 STD_EXCEPTION_PSERIES(., performance_monitor)
520
521 .align 7
522 _GLOBAL(do_stab_bolted_pSeries)
523 mtcrf 0x80,r12
524 mfspr r12,SPRN_SPRG2
525 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
526
527 /*
528 * We have some room here we use that to put
529 * the peries slb miss user trampoline code so it's reasonably
530 * away from slb_miss_user_common to avoid problems with rfid
531 *
532 * This is used for when the SLB miss handler has to go virtual,
533 * which doesn't happen for now anymore but will once we re-implement
534 * dynamic VSIDs for shared page tables
535 */
536 #ifdef __DISABLED__
537 slb_miss_user_pseries:
538 std r10,PACA_EXGEN+EX_R10(r13)
539 std r11,PACA_EXGEN+EX_R11(r13)
540 std r12,PACA_EXGEN+EX_R12(r13)
541 mfspr r10,SPRG1
542 ld r11,PACA_EXSLB+EX_R9(r13)
543 ld r12,PACA_EXSLB+EX_R3(r13)
544 std r10,PACA_EXGEN+EX_R13(r13)
545 std r11,PACA_EXGEN+EX_R9(r13)
546 std r12,PACA_EXGEN+EX_R3(r13)
547 clrrdi r12,r13,32
548 mfmsr r10
549 mfspr r11,SRR0 /* save SRR0 */
550 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
551 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
552 mtspr SRR0,r12
553 mfspr r12,SRR1 /* and SRR1 */
554 mtspr SRR1,r10
555 rfid
556 b . /* prevent spec. execution */
557 #endif /* __DISABLED__ */
558
559 /*
560 * Vectors for the FWNMI option. Share common code.
561 */
562 .globl system_reset_fwnmi
563 .align 7
564 system_reset_fwnmi:
565 HMT_MEDIUM
566 mtspr SPRN_SPRG1,r13 /* save r13 */
567 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
568
569 .globl machine_check_fwnmi
570 .align 7
571 machine_check_fwnmi:
572 HMT_MEDIUM
573 mtspr SPRN_SPRG1,r13 /* save r13 */
574 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
575
576 #ifdef CONFIG_PPC_ISERIES
577 /*** ISeries-LPAR interrupt handlers ***/
578
579 STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
580
581 .globl data_access_iSeries
582 data_access_iSeries:
583 mtspr SPRN_SPRG1,r13
584 BEGIN_FTR_SECTION
585 mtspr SPRN_SPRG2,r12
586 mfspr r13,SPRN_DAR
587 mfspr r12,SPRN_DSISR
588 srdi r13,r13,60
589 rlwimi r13,r12,16,0x20
590 mfcr r12
591 cmpwi r13,0x2c
592 beq .do_stab_bolted_iSeries
593 mtcrf 0x80,r12
594 mfspr r12,SPRN_SPRG2
595 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
596 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
597 EXCEPTION_PROLOG_ISERIES_2
598 b data_access_common
599
600 .do_stab_bolted_iSeries:
601 mtcrf 0x80,r12
602 mfspr r12,SPRN_SPRG2
603 EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
604 EXCEPTION_PROLOG_ISERIES_2
605 b .do_stab_bolted
606
607 .globl data_access_slb_iSeries
608 data_access_slb_iSeries:
609 mtspr SPRN_SPRG1,r13 /* save r13 */
610 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
611 std r3,PACA_EXSLB+EX_R3(r13)
612 mfspr r3,SPRN_DAR
613 std r9,PACA_EXSLB+EX_R9(r13)
614 mfcr r9
615 #ifdef __DISABLED__
616 cmpdi r3,0
617 bge slb_miss_user_iseries
618 #endif
619 std r10,PACA_EXSLB+EX_R10(r13)
620 std r11,PACA_EXSLB+EX_R11(r13)
621 std r12,PACA_EXSLB+EX_R12(r13)
622 mfspr r10,SPRN_SPRG1
623 std r10,PACA_EXSLB+EX_R13(r13)
624 ld r12,PACALPPACAPTR(r13)
625 ld r12,LPPACASRR1(r12)
626 b .slb_miss_realmode
627
628 STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
629
630 .globl instruction_access_slb_iSeries
631 instruction_access_slb_iSeries:
632 mtspr SPRN_SPRG1,r13 /* save r13 */
633 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
634 std r3,PACA_EXSLB+EX_R3(r13)
635 ld r3,PACALPPACAPTR(r13)
636 ld r3,LPPACASRR0(r3) /* get SRR0 value */
637 std r9,PACA_EXSLB+EX_R9(r13)
638 mfcr r9
639 #ifdef __DISABLED__
640 cmpdi r3,0
641 bge .slb_miss_user_iseries
642 #endif
643 std r10,PACA_EXSLB+EX_R10(r13)
644 std r11,PACA_EXSLB+EX_R11(r13)
645 std r12,PACA_EXSLB+EX_R12(r13)
646 mfspr r10,SPRN_SPRG1
647 std r10,PACA_EXSLB+EX_R13(r13)
648 ld r12,PACALPPACAPTR(r13)
649 ld r12,LPPACASRR1(r12)
650 b .slb_miss_realmode
651
652 #ifdef __DISABLED__
653 slb_miss_user_iseries:
654 std r10,PACA_EXGEN+EX_R10(r13)
655 std r11,PACA_EXGEN+EX_R11(r13)
656 std r12,PACA_EXGEN+EX_R12(r13)
657 mfspr r10,SPRG1
658 ld r11,PACA_EXSLB+EX_R9(r13)
659 ld r12,PACA_EXSLB+EX_R3(r13)
660 std r10,PACA_EXGEN+EX_R13(r13)
661 std r11,PACA_EXGEN+EX_R9(r13)
662 std r12,PACA_EXGEN+EX_R3(r13)
663 EXCEPTION_PROLOG_ISERIES_2
664 b slb_miss_user_common
665 #endif
666
667 MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
668 STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
669 STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
670 STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
671 MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
672 STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
673 STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
674
675 .globl system_call_iSeries
676 system_call_iSeries:
677 mr r9,r13
678 mfspr r13,SPRN_SPRG3
679 EXCEPTION_PROLOG_ISERIES_2
680 b system_call_common
681
682 STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
683 STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
684 STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
685
686 .globl system_reset_iSeries
687 system_reset_iSeries:
688 mfspr r13,SPRN_SPRG3 /* Get paca address */
689 mfmsr r24
690 ori r24,r24,MSR_RI
691 mtmsrd r24 /* RI on */
692 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
693 cmpwi 0,r24,0 /* Are we processor 0? */
694 beq .__start_initialization_iSeries /* Start up the first processor */
695 mfspr r4,SPRN_CTRLF
696 li r5,CTRL_RUNLATCH /* Turn off the run light */
697 andc r4,r4,r5
698 mtspr SPRN_CTRLT,r4
699
700 1:
701 HMT_LOW
702 #ifdef CONFIG_SMP
703 lbz r23,PACAPROCSTART(r13) /* Test if this processor
704 * should start */
705 sync
706 LOAD_REG_IMMEDIATE(r3,current_set)
707 sldi r28,r24,3 /* get current_set[cpu#] */
708 ldx r3,r3,r28
709 addi r1,r3,THREAD_SIZE
710 subi r1,r1,STACK_FRAME_OVERHEAD
711
712 cmpwi 0,r23,0
713 beq iSeries_secondary_smp_loop /* Loop until told to go */
714 bne .__secondary_start /* Loop until told to go */
715 iSeries_secondary_smp_loop:
716 /* Let the Hypervisor know we are alive */
717 /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
718 lis r3,0x8002
719 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
720 #else /* CONFIG_SMP */
721 /* Yield the processor. This is required for non-SMP kernels
722 which are running on multi-threaded machines. */
723 lis r3,0x8000
724 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
725 addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
726 li r4,0 /* "yield timed" */
727 li r5,-1 /* "yield forever" */
728 #endif /* CONFIG_SMP */
729 li r0,-1 /* r0=-1 indicates a Hypervisor call */
730 sc /* Invoke the hypervisor via a system call */
731 mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
732 b 1b /* If SMP not configured, secondaries
733 * loop forever */
734
735 .globl decrementer_iSeries_masked
736 decrementer_iSeries_masked:
737 /* We may not have a valid TOC pointer in here. */
738 li r11,1
739 ld r12,PACALPPACAPTR(r13)
740 stb r11,LPPACADECRINT(r12)
741 LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy)
742 lwz r12,0(r12)
743 mtspr SPRN_DEC,r12
744 /* fall through */
745
746 .globl hardware_interrupt_iSeries_masked
747 hardware_interrupt_iSeries_masked:
748 mtcrf 0x80,r9 /* Restore regs */
749 ld r12,PACALPPACAPTR(r13)
750 ld r11,LPPACASRR0(r12)
751 ld r12,LPPACASRR1(r12)
752 mtspr SPRN_SRR0,r11
753 mtspr SPRN_SRR1,r12
754 ld r9,PACA_EXGEN+EX_R9(r13)
755 ld r10,PACA_EXGEN+EX_R10(r13)
756 ld r11,PACA_EXGEN+EX_R11(r13)
757 ld r12,PACA_EXGEN+EX_R12(r13)
758 ld r13,PACA_EXGEN+EX_R13(r13)
759 rfid
760 b . /* prevent speculative execution */
761 #endif /* CONFIG_PPC_ISERIES */
762
763 /*** Common interrupt handlers ***/
764
765 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
766
767 /*
768 * Machine check is different because we use a different
769 * save area: PACA_EXMC instead of PACA_EXGEN.
770 */
771 .align 7
772 .globl machine_check_common
773 machine_check_common:
774 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
775 DISABLE_INTS
776 bl .save_nvgprs
777 addi r3,r1,STACK_FRAME_OVERHEAD
778 bl .machine_check_exception
779 b .ret_from_except
780
781 STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt)
782 STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
783 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
784 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
785 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
786 STD_EXCEPTION_COMMON(0xf00, performance_monitor, .performance_monitor_exception)
787 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
788 #ifdef CONFIG_ALTIVEC
789 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
790 #else
791 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
792 #endif
793
794 /*
795 * Here we have detected that the kernel stack pointer is bad.
796 * R9 contains the saved CR, r13 points to the paca,
797 * r10 contains the (bad) kernel stack pointer,
798 * r11 and r12 contain the saved SRR0 and SRR1.
799 * We switch to using an emergency stack, save the registers there,
800 * and call kernel_bad_stack(), which panics.
801 */
802 bad_stack:
803 ld r1,PACAEMERGSP(r13)
804 subi r1,r1,64+INT_FRAME_SIZE
805 std r9,_CCR(r1)
806 std r10,GPR1(r1)
807 std r11,_NIP(r1)
808 std r12,_MSR(r1)
809 mfspr r11,SPRN_DAR
810 mfspr r12,SPRN_DSISR
811 std r11,_DAR(r1)
812 std r12,_DSISR(r1)
813 mflr r10
814 mfctr r11
815 mfxer r12
816 std r10,_LINK(r1)
817 std r11,_CTR(r1)
818 std r12,_XER(r1)
819 SAVE_GPR(0,r1)
820 SAVE_GPR(2,r1)
821 SAVE_4GPRS(3,r1)
822 SAVE_2GPRS(7,r1)
823 SAVE_10GPRS(12,r1)
824 SAVE_10GPRS(22,r1)
825 addi r11,r1,INT_FRAME_SIZE
826 std r11,0(r1)
827 li r12,0
828 std r12,0(r11)
829 ld r2,PACATOC(r13)
830 1: addi r3,r1,STACK_FRAME_OVERHEAD
831 bl .kernel_bad_stack
832 b 1b
833
834 /*
835 * Return from an exception with minimal checks.
836 * The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
837 * If interrupts have been enabled, or anything has been
838 * done that might have changed the scheduling status of
839 * any task or sent any task a signal, you should use
840 * ret_from_except or ret_from_except_lite instead of this.
841 */
842 .globl fast_exception_return
843 fast_exception_return:
844 ld r12,_MSR(r1)
845 ld r11,_NIP(r1)
846 andi. r3,r12,MSR_RI /* check if RI is set */
847 beq- unrecov_fer
848
849 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
850 andi. r3,r12,MSR_PR
851 beq 2f
852 ACCOUNT_CPU_USER_EXIT(r3, r4)
853 2:
854 #endif
855
856 ld r3,_CCR(r1)
857 ld r4,_LINK(r1)
858 ld r5,_CTR(r1)
859 ld r6,_XER(r1)
860 mtcr r3
861 mtlr r4
862 mtctr r5
863 mtxer r6
864 REST_GPR(0, r1)
865 REST_8GPRS(2, r1)
866
867 mfmsr r10
868 clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
869 mtmsrd r10,1
870
871 mtspr SPRN_SRR1,r12
872 mtspr SPRN_SRR0,r11
873 REST_4GPRS(10, r1)
874 ld r1,GPR1(r1)
875 rfid
876 b . /* prevent speculative execution */
877
878 unrecov_fer:
879 bl .save_nvgprs
880 1: addi r3,r1,STACK_FRAME_OVERHEAD
881 bl .unrecoverable_exception
882 b 1b
883
884 /*
885 * Here r13 points to the paca, r9 contains the saved CR,
886 * SRR0 and SRR1 are saved in r11 and r12,
887 * r9 - r13 are saved in paca->exgen.
888 */
889 .align 7
890 .globl data_access_common
891 data_access_common:
892 mfspr r10,SPRN_DAR
893 std r10,PACA_EXGEN+EX_DAR(r13)
894 mfspr r10,SPRN_DSISR
895 stw r10,PACA_EXGEN+EX_DSISR(r13)
896 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
897 ld r3,PACA_EXGEN+EX_DAR(r13)
898 lwz r4,PACA_EXGEN+EX_DSISR(r13)
899 li r5,0x300
900 b .do_hash_page /* Try to handle as hpte fault */
901
902 .align 7
903 .globl instruction_access_common
904 instruction_access_common:
905 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
906 ld r3,_NIP(r1)
907 andis. r4,r12,0x5820
908 li r5,0x400
909 b .do_hash_page /* Try to handle as hpte fault */
910
911 /*
912 * Here is the common SLB miss user that is used when going to virtual
913 * mode for SLB misses, that is currently not used
914 */
915 #ifdef __DISABLED__
916 .align 7
917 .globl slb_miss_user_common
918 slb_miss_user_common:
919 mflr r10
920 std r3,PACA_EXGEN+EX_DAR(r13)
921 stw r9,PACA_EXGEN+EX_CCR(r13)
922 std r10,PACA_EXGEN+EX_LR(r13)
923 std r11,PACA_EXGEN+EX_SRR0(r13)
924 bl .slb_allocate_user
925
926 ld r10,PACA_EXGEN+EX_LR(r13)
927 ld r3,PACA_EXGEN+EX_R3(r13)
928 lwz r9,PACA_EXGEN+EX_CCR(r13)
929 ld r11,PACA_EXGEN+EX_SRR0(r13)
930 mtlr r10
931 beq- slb_miss_fault
932
933 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
934 beq- unrecov_user_slb
935 mfmsr r10
936
937 .machine push
938 .machine "power4"
939 mtcrf 0x80,r9
940 .machine pop
941
942 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
943 mtmsrd r10,1
944
945 mtspr SRR0,r11
946 mtspr SRR1,r12
947
948 ld r9,PACA_EXGEN+EX_R9(r13)
949 ld r10,PACA_EXGEN+EX_R10(r13)
950 ld r11,PACA_EXGEN+EX_R11(r13)
951 ld r12,PACA_EXGEN+EX_R12(r13)
952 ld r13,PACA_EXGEN+EX_R13(r13)
953 rfid
954 b .
955
956 slb_miss_fault:
957 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
958 ld r4,PACA_EXGEN+EX_DAR(r13)
959 li r5,0
960 std r4,_DAR(r1)
961 std r5,_DSISR(r1)
962 b .handle_page_fault
963
964 unrecov_user_slb:
965 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
966 DISABLE_INTS
967 bl .save_nvgprs
968 1: addi r3,r1,STACK_FRAME_OVERHEAD
969 bl .unrecoverable_exception
970 b 1b
971
972 #endif /* __DISABLED__ */
973
974
975 /*
976 * r13 points to the PACA, r9 contains the saved CR,
977 * r12 contain the saved SRR1, SRR0 is still ready for return
978 * r3 has the faulting address
979 * r9 - r13 are saved in paca->exslb.
980 * r3 is saved in paca->slb_r3
981 * We assume we aren't going to take any exceptions during this procedure.
982 */
983 _GLOBAL(slb_miss_realmode)
984 mflr r10
985
986 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
987 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
988
989 bl .slb_allocate_realmode
990
991 /* All done -- return from exception. */
992
993 ld r10,PACA_EXSLB+EX_LR(r13)
994 ld r3,PACA_EXSLB+EX_R3(r13)
995 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
996 #ifdef CONFIG_PPC_ISERIES
997 ld r11,PACALPPACAPTR(r13)
998 ld r11,LPPACASRR0(r11) /* get SRR0 value */
999 #endif /* CONFIG_PPC_ISERIES */
1000
1001 mtlr r10
1002
1003 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1004 beq- unrecov_slb
1005
1006 .machine push
1007 .machine "power4"
1008 mtcrf 0x80,r9
1009 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1010 .machine pop
1011
1012 #ifdef CONFIG_PPC_ISERIES
1013 mtspr SPRN_SRR0,r11
1014 mtspr SPRN_SRR1,r12
1015 #endif /* CONFIG_PPC_ISERIES */
1016 ld r9,PACA_EXSLB+EX_R9(r13)
1017 ld r10,PACA_EXSLB+EX_R10(r13)
1018 ld r11,PACA_EXSLB+EX_R11(r13)
1019 ld r12,PACA_EXSLB+EX_R12(r13)
1020 ld r13,PACA_EXSLB+EX_R13(r13)
1021 rfid
1022 b . /* prevent speculative execution */
1023
1024 unrecov_slb:
1025 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1026 DISABLE_INTS
1027 bl .save_nvgprs
1028 1: addi r3,r1,STACK_FRAME_OVERHEAD
1029 bl .unrecoverable_exception
1030 b 1b
1031
1032 .align 7
1033 .globl hardware_interrupt_common
1034 .globl hardware_interrupt_entry
1035 hardware_interrupt_common:
1036 EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
1037 hardware_interrupt_entry:
1038 DISABLE_INTS
1039 bl .ppc64_runlatch_on
1040 addi r3,r1,STACK_FRAME_OVERHEAD
1041 bl .do_IRQ
1042 b .ret_from_except_lite
1043
1044 .align 7
1045 .globl alignment_common
1046 alignment_common:
1047 mfspr r10,SPRN_DAR
1048 std r10,PACA_EXGEN+EX_DAR(r13)
1049 mfspr r10,SPRN_DSISR
1050 stw r10,PACA_EXGEN+EX_DSISR(r13)
1051 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1052 ld r3,PACA_EXGEN+EX_DAR(r13)
1053 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1054 std r3,_DAR(r1)
1055 std r4,_DSISR(r1)
1056 bl .save_nvgprs
1057 addi r3,r1,STACK_FRAME_OVERHEAD
1058 ENABLE_INTS
1059 bl .alignment_exception
1060 b .ret_from_except
1061
1062 .align 7
1063 .globl program_check_common
1064 program_check_common:
1065 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1066 bl .save_nvgprs
1067 addi r3,r1,STACK_FRAME_OVERHEAD
1068 ENABLE_INTS
1069 bl .program_check_exception
1070 b .ret_from_except
1071
1072 .align 7
1073 .globl fp_unavailable_common
1074 fp_unavailable_common:
1075 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1076 bne .load_up_fpu /* if from user, just load it up */
1077 bl .save_nvgprs
1078 addi r3,r1,STACK_FRAME_OVERHEAD
1079 ENABLE_INTS
1080 bl .kernel_fp_unavailable_exception
1081 BUG_OPCODE
1082
1083 .align 7
1084 .globl altivec_unavailable_common
1085 altivec_unavailable_common:
1086 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1087 #ifdef CONFIG_ALTIVEC
1088 BEGIN_FTR_SECTION
1089 bne .load_up_altivec /* if from user, just load it up */
1090 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1091 #endif
1092 bl .save_nvgprs
1093 addi r3,r1,STACK_FRAME_OVERHEAD
1094 ENABLE_INTS
1095 bl .altivec_unavailable_exception
1096 b .ret_from_except
1097
1098 #ifdef CONFIG_ALTIVEC
1099 /*
1100 * load_up_altivec(unused, unused, tsk)
1101 * Disable VMX for the task which had it previously,
1102 * and save its vector registers in its thread_struct.
1103 * Enables the VMX for use in the kernel on return.
1104 * On SMP we know the VMX is free, since we give it up every
1105 * switch (ie, no lazy save of the vector registers).
1106 * On entry: r13 == 'current' && last_task_used_altivec != 'current'
1107 */
1108 _STATIC(load_up_altivec)
1109 mfmsr r5 /* grab the current MSR */
1110 oris r5,r5,MSR_VEC@h
1111 mtmsrd r5 /* enable use of VMX now */
1112 isync
1113
1114 /*
1115 * For SMP, we don't do lazy VMX switching because it just gets too
1116 * horrendously complex, especially when a task switches from one CPU
1117 * to another. Instead we call giveup_altvec in switch_to.
1118 * VRSAVE isn't dealt with here, that is done in the normal context
1119 * switch code. Note that we could rely on vrsave value to eventually
1120 * avoid saving all of the VREGs here...
1121 */
1122 #ifndef CONFIG_SMP
1123 ld r3,last_task_used_altivec@got(r2)
1124 ld r4,0(r3)
1125 cmpdi 0,r4,0
1126 beq 1f
1127 /* Save VMX state to last_task_used_altivec's THREAD struct */
1128 addi r4,r4,THREAD
1129 SAVE_32VRS(0,r5,r4)
1130 mfvscr vr0
1131 li r10,THREAD_VSCR
1132 stvx vr0,r10,r4
1133 /* Disable VMX for last_task_used_altivec */
1134 ld r5,PT_REGS(r4)
1135 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1136 lis r6,MSR_VEC@h
1137 andc r4,r4,r6
1138 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1139 1:
1140 #endif /* CONFIG_SMP */
1141 /* Hack: if we get an altivec unavailable trap with VRSAVE
1142 * set to all zeros, we assume this is a broken application
1143 * that fails to set it properly, and thus we switch it to
1144 * all 1's
1145 */
1146 mfspr r4,SPRN_VRSAVE
1147 cmpdi 0,r4,0
1148 bne+ 1f
1149 li r4,-1
1150 mtspr SPRN_VRSAVE,r4
1151 1:
1152 /* enable use of VMX after return */
1153 ld r4,PACACURRENT(r13)
1154 addi r5,r4,THREAD /* Get THREAD */
1155 oris r12,r12,MSR_VEC@h
1156 std r12,_MSR(r1)
1157 li r4,1
1158 li r10,THREAD_VSCR
1159 stw r4,THREAD_USED_VR(r5)
1160 lvx vr0,r10,r5
1161 mtvscr vr0
1162 REST_32VRS(0,r4,r5)
1163 #ifndef CONFIG_SMP
1164 /* Update last_task_used_math to 'current' */
1165 subi r4,r5,THREAD /* Back to 'current' */
1166 std r4,0(r3)
1167 #endif /* CONFIG_SMP */
1168 /* restore registers and return */
1169 b fast_exception_return
1170 #endif /* CONFIG_ALTIVEC */
1171
1172 /*
1173 * Hash table stuff
1174 */
1175 .align 7
1176 _GLOBAL(do_hash_page)
1177 std r3,_DAR(r1)
1178 std r4,_DSISR(r1)
1179
1180 andis. r0,r4,0xa450 /* weird error? */
1181 bne- .handle_page_fault /* if not, try to insert a HPTE */
1182 BEGIN_FTR_SECTION
1183 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1184 bne- .do_ste_alloc /* If so handle it */
1185 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1186
1187 /*
1188 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1189 * accessing a userspace segment (even from the kernel). We assume
1190 * kernel addresses always have the high bit set.
1191 */
1192 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1193 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1194 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1195 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1196 ori r4,r4,1 /* add _PAGE_PRESENT */
1197 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1198
1199 /*
1200 * On iSeries, we soft-disable interrupts here, then
1201 * hard-enable interrupts so that the hash_page code can spin on
1202 * the hash_table_lock without problems on a shared processor.
1203 */
1204 DISABLE_INTS
1205
1206 /*
1207 * r3 contains the faulting address
1208 * r4 contains the required access permissions
1209 * r5 contains the trap number
1210 *
1211 * at return r3 = 0 for success
1212 */
1213 bl .hash_page /* build HPTE if possible */
1214 cmpdi r3,0 /* see if hash_page succeeded */
1215
1216 #ifdef DO_SOFT_DISABLE
1217 /*
1218 * If we had interrupts soft-enabled at the point where the
1219 * DSI/ISI occurred, and an interrupt came in during hash_page,
1220 * handle it now.
1221 * We jump to ret_from_except_lite rather than fast_exception_return
1222 * because ret_from_except_lite will check for and handle pending
1223 * interrupts if necessary.
1224 */
1225 beq .ret_from_except_lite
1226 /* For a hash failure, we don't bother re-enabling interrupts */
1227 ble- 12f
1228
1229 /*
1230 * hash_page couldn't handle it, set soft interrupt enable back
1231 * to what it was before the trap. Note that .local_irq_restore
1232 * handles any interrupts pending at this point.
1233 */
1234 ld r3,SOFTE(r1)
1235 bl .local_irq_restore
1236 b 11f
1237 #else
1238 beq fast_exception_return /* Return from exception on success */
1239 ble- 12f /* Failure return from hash_page */
1240
1241 /* fall through */
1242 #endif
1243
1244 /* Here we have a page fault that hash_page can't handle. */
1245 _GLOBAL(handle_page_fault)
1246 ENABLE_INTS
1247 11: ld r4,_DAR(r1)
1248 ld r5,_DSISR(r1)
1249 addi r3,r1,STACK_FRAME_OVERHEAD
1250 bl .do_page_fault
1251 cmpdi r3,0
1252 beq+ .ret_from_except_lite
1253 bl .save_nvgprs
1254 mr r5,r3
1255 addi r3,r1,STACK_FRAME_OVERHEAD
1256 lwz r4,_DAR(r1)
1257 bl .bad_page_fault
1258 b .ret_from_except
1259
1260 /* We have a page fault that hash_page could handle but HV refused
1261 * the PTE insertion
1262 */
1263 12: bl .save_nvgprs
1264 addi r3,r1,STACK_FRAME_OVERHEAD
1265 lwz r4,_DAR(r1)
1266 bl .low_hash_fault
1267 b .ret_from_except
1268
1269 /* here we have a segment miss */
1270 _GLOBAL(do_ste_alloc)
1271 bl .ste_allocate /* try to insert stab entry */
1272 cmpdi r3,0
1273 beq+ fast_exception_return
1274 b .handle_page_fault
1275
1276 /*
1277 * r13 points to the PACA, r9 contains the saved CR,
1278 * r11 and r12 contain the saved SRR0 and SRR1.
1279 * r9 - r13 are saved in paca->exslb.
1280 * We assume we aren't going to take any exceptions during this procedure.
1281 * We assume (DAR >> 60) == 0xc.
1282 */
1283 .align 7
1284 _GLOBAL(do_stab_bolted)
1285 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1286 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1287
1288 /* Hash to the primary group */
1289 ld r10,PACASTABVIRT(r13)
1290 mfspr r11,SPRN_DAR
1291 srdi r11,r11,28
1292 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1293
1294 /* Calculate VSID */
1295 /* This is a kernel address, so protovsid = ESID */
1296 ASM_VSID_SCRAMBLE(r11, r9)
1297 rldic r9,r11,12,16 /* r9 = vsid << 12 */
1298
1299 /* Search the primary group for a free entry */
1300 1: ld r11,0(r10) /* Test valid bit of the current ste */
1301 andi. r11,r11,0x80
1302 beq 2f
1303 addi r10,r10,16
1304 andi. r11,r10,0x70
1305 bne 1b
1306
1307 /* Stick for only searching the primary group for now. */
1308 /* At least for now, we use a very simple random castout scheme */
1309 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1310 mftb r11
1311 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1312 ori r11,r11,0x10
1313
1314 /* r10 currently points to an ste one past the group of interest */
1315 /* make it point to the randomly selected entry */
1316 subi r10,r10,128
1317 or r10,r10,r11 /* r10 is the entry to invalidate */
1318
1319 isync /* mark the entry invalid */
1320 ld r11,0(r10)
1321 rldicl r11,r11,56,1 /* clear the valid bit */
1322 rotldi r11,r11,8
1323 std r11,0(r10)
1324 sync
1325
1326 clrrdi r11,r11,28 /* Get the esid part of the ste */
1327 slbie r11
1328
1329 2: std r9,8(r10) /* Store the vsid part of the ste */
1330 eieio
1331
1332 mfspr r11,SPRN_DAR /* Get the new esid */
1333 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1334 ori r11,r11,0x90 /* Turn on valid and kp */
1335 std r11,0(r10) /* Put new entry back into the stab */
1336
1337 sync
1338
1339 /* All done -- return from exception. */
1340 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1341 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1342
1343 andi. r10,r12,MSR_RI
1344 beq- unrecov_slb
1345
1346 mtcrf 0x80,r9 /* restore CR */
1347
1348 mfmsr r10
1349 clrrdi r10,r10,2
1350 mtmsrd r10,1
1351
1352 mtspr SPRN_SRR0,r11
1353 mtspr SPRN_SRR1,r12
1354 ld r9,PACA_EXSLB+EX_R9(r13)
1355 ld r10,PACA_EXSLB+EX_R10(r13)
1356 ld r11,PACA_EXSLB+EX_R11(r13)
1357 ld r12,PACA_EXSLB+EX_R12(r13)
1358 ld r13,PACA_EXSLB+EX_R13(r13)
1359 rfid
1360 b . /* prevent speculative execution */
1361
1362 /*
1363 * Space for CPU0's segment table.
1364 *
1365 * On iSeries, the hypervisor must fill in at least one entry before
1366 * we get control (with relocate on). The address is give to the hv
1367 * as a page number (see xLparMap in lpardata.c), so this must be at a
1368 * fixed address (the linker can't compute (u64)&initial_stab >>
1369 * PAGE_SHIFT).
1370 */
1371 . = STAB0_OFFSET /* 0x6000 */
1372 .globl initial_stab
1373 initial_stab:
1374 .space 4096
1375
1376 /*
1377 * Data area reserved for FWNMI option.
1378 * This address (0x7000) is fixed by the RPA.
1379 */
1380 .= 0x7000
1381 .globl fwnmi_data_area
1382 fwnmi_data_area:
1383
1384 /* iSeries does not use the FWNMI stuff, so it is safe to put
1385 * this here, even if we later allow kernels that will boot on
1386 * both pSeries and iSeries */
1387 #ifdef CONFIG_PPC_ISERIES
1388 . = LPARMAP_PHYS
1389 #include "lparmap.s"
1390 /*
1391 * This ".text" is here for old compilers that generate a trailing
1392 * .note section when compiling .c files to .s
1393 */
1394 .text
1395 #endif /* CONFIG_PPC_ISERIES */
1396
1397 . = 0x8000
1398
1399 /*
1400 * On pSeries, secondary processors spin in the following code.
1401 * At entry, r3 = this processor's number (physical cpu id)
1402 */
1403 _GLOBAL(pSeries_secondary_smp_init)
1404 mr r24,r3
1405
1406 /* turn on 64-bit mode */
1407 bl .enable_64b_mode
1408 isync
1409
1410 /* Copy some CPU settings from CPU 0 */
1411 bl .__restore_cpu_setup
1412
1413 /* Set up a paca value for this processor. Since we have the
1414 * physical cpu id in r24, we need to search the pacas to find
1415 * which logical id maps to our physical one.
1416 */
1417 LOAD_REG_IMMEDIATE(r13, paca) /* Get base vaddr of paca array */
1418 li r5,0 /* logical cpu id */
1419 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */
1420 cmpw r6,r24 /* Compare to our id */
1421 beq 2f
1422 addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */
1423 addi r5,r5,1
1424 cmpwi r5,NR_CPUS
1425 blt 1b
1426
1427 mr r3,r24 /* not found, copy phys to r3 */
1428 b .kexec_wait /* next kernel might do better */
1429
1430 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1431 /* From now on, r24 is expected to be logical cpuid */
1432 mr r24,r5
1433 3: HMT_LOW
1434 lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
1435 /* start. */
1436 sync
1437
1438 /* Create a temp kernel stack for use before relocation is on. */
1439 ld r1,PACAEMERGSP(r13)
1440 subi r1,r1,STACK_FRAME_OVERHEAD
1441
1442 cmpwi 0,r23,0
1443 #ifdef CONFIG_SMP
1444 bne .__secondary_start
1445 #endif
1446 b 3b /* Loop until told to go */
1447
1448 #ifdef CONFIG_PPC_ISERIES
1449 _STATIC(__start_initialization_iSeries)
1450 /* Clear out the BSS */
1451 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1452 LOAD_REG_IMMEDIATE(r8,__bss_start)
1453 sub r11,r11,r8 /* bss size */
1454 addi r11,r11,7 /* round up to an even double word */
1455 rldicl. r11,r11,61,3 /* shift right by 3 */
1456 beq 4f
1457 addi r8,r8,-8
1458 li r0,0
1459 mtctr r11 /* zero this many doublewords */
1460 3: stdu r0,8(r8)
1461 bdnz 3b
1462 4:
1463 LOAD_REG_IMMEDIATE(r1,init_thread_union)
1464 addi r1,r1,THREAD_SIZE
1465 li r0,0
1466 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1467
1468 LOAD_REG_IMMEDIATE(r3,cpu_specs)
1469 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1470 li r5,0
1471 bl .identify_cpu
1472
1473 LOAD_REG_IMMEDIATE(r2,__toc_start)
1474 addi r2,r2,0x4000
1475 addi r2,r2,0x4000
1476
1477 bl .iSeries_early_setup
1478 bl .early_setup
1479
1480 /* relocation is on at this point */
1481
1482 b .start_here_common
1483 #endif /* CONFIG_PPC_ISERIES */
1484
1485 #ifdef CONFIG_PPC_MULTIPLATFORM
1486
1487 _STATIC(__mmu_off)
1488 mfmsr r3
1489 andi. r0,r3,MSR_IR|MSR_DR
1490 beqlr
1491 andc r3,r3,r0
1492 mtspr SPRN_SRR0,r4
1493 mtspr SPRN_SRR1,r3
1494 sync
1495 rfid
1496 b . /* prevent speculative execution */
1497
1498
1499 /*
1500 * Here is our main kernel entry point. We support currently 2 kind of entries
1501 * depending on the value of r5.
1502 *
1503 * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
1504 * in r3...r7
1505 *
1506 * r5 == NULL -> kexec style entry. r3 is a physical pointer to the
1507 * DT block, r4 is a physical pointer to the kernel itself
1508 *
1509 */
1510 _GLOBAL(__start_initialization_multiplatform)
1511 #ifdef CONFIG_PPC_MULTIPLATFORM
1512 /*
1513 * Are we booted from a PROM Of-type client-interface ?
1514 */
1515 cmpldi cr0,r5,0
1516 bne .__boot_from_prom /* yes -> prom */
1517 #endif
1518
1519 /* Save parameters */
1520 mr r31,r3
1521 mr r30,r4
1522
1523 /* Make sure we are running in 64 bits mode */
1524 bl .enable_64b_mode
1525
1526 /* Setup some critical 970 SPRs before switching MMU off */
1527 bl .__970_cpu_preinit
1528
1529 /* cpu # */
1530 li r24,0
1531
1532 /* Switch off MMU if not already */
1533 LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
1534 add r4,r4,r30
1535 bl .__mmu_off
1536 b .__after_prom_start
1537
1538 #ifdef CONFIG_PPC_MULTIPLATFORM
1539 _STATIC(__boot_from_prom)
1540 /* Save parameters */
1541 mr r31,r3
1542 mr r30,r4
1543 mr r29,r5
1544 mr r28,r6
1545 mr r27,r7
1546
1547 /*
1548 * Align the stack to 16-byte boundary
1549 * Depending on the size and layout of the ELF sections in the initial
1550 * boot binary, the stack pointer will be unalignet on PowerMac
1551 */
1552 rldicr r1,r1,0,59
1553
1554 /* Make sure we are running in 64 bits mode */
1555 bl .enable_64b_mode
1556
1557 /* put a relocation offset into r3 */
1558 bl .reloc_offset
1559
1560 LOAD_REG_IMMEDIATE(r2,__toc_start)
1561 addi r2,r2,0x4000
1562 addi r2,r2,0x4000
1563
1564 /* Relocate the TOC from a virt addr to a real addr */
1565 add r2,r2,r3
1566
1567 /* Restore parameters */
1568 mr r3,r31
1569 mr r4,r30
1570 mr r5,r29
1571 mr r6,r28
1572 mr r7,r27
1573
1574 /* Do all of the interaction with OF client interface */
1575 bl .prom_init
1576 /* We never return */
1577 trap
1578 #endif
1579
1580 /*
1581 * At this point, r3 contains the physical address we are running at,
1582 * returned by prom_init()
1583 */
1584 _STATIC(__after_prom_start)
1585
1586 /*
1587 * We need to run with __start at physical address PHYSICAL_START.
1588 * This will leave some code in the first 256B of
1589 * real memory, which are reserved for software use.
1590 * The remainder of the first page is loaded with the fixed
1591 * interrupt vectors. The next two pages are filled with
1592 * unknown exception placeholders.
1593 *
1594 * Note: This process overwrites the OF exception vectors.
1595 * r26 == relocation offset
1596 * r27 == KERNELBASE
1597 */
1598 bl .reloc_offset
1599 mr r26,r3
1600 LOAD_REG_IMMEDIATE(r27, KERNELBASE)
1601
1602 LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */
1603
1604 // XXX FIXME: Use phys returned by OF (r30)
1605 add r4,r27,r26 /* source addr */
1606 /* current address of _start */
1607 /* i.e. where we are running */
1608 /* the source addr */
1609
1610 LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
1611 sub r5,r5,r27
1612
1613 li r6,0x100 /* Start offset, the first 0x100 */
1614 /* bytes were copied earlier. */
1615
1616 bl .copy_and_flush /* copy the first n bytes */
1617 /* this includes the code being */
1618 /* executed here. */
1619
1620 LOAD_REG_IMMEDIATE(r0, 4f) /* Jump to the copy of this code */
1621 mtctr r0 /* that we just made/relocated */
1622 bctr
1623
1624 4: LOAD_REG_IMMEDIATE(r5,klimit)
1625 add r5,r5,r26
1626 ld r5,0(r5) /* get the value of klimit */
1627 sub r5,r5,r27
1628 bl .copy_and_flush /* copy the rest */
1629 b .start_here_multiplatform
1630
1631 #endif /* CONFIG_PPC_MULTIPLATFORM */
1632
1633 /*
1634 * Copy routine used to copy the kernel to start at physical address 0
1635 * and flush and invalidate the caches as needed.
1636 * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
1637 * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
1638 *
1639 * Note: this routine *only* clobbers r0, r6 and lr
1640 */
1641 _GLOBAL(copy_and_flush)
1642 addi r5,r5,-8
1643 addi r6,r6,-8
1644 4: li r0,16 /* Use the least common */
1645 /* denominator cache line */
1646 /* size. This results in */
1647 /* extra cache line flushes */
1648 /* but operation is correct. */
1649 /* Can't get cache line size */
1650 /* from NACA as it is being */
1651 /* moved too. */
1652
1653 mtctr r0 /* put # words/line in ctr */
1654 3: addi r6,r6,8 /* copy a cache line */
1655 ldx r0,r6,r4
1656 stdx r0,r6,r3
1657 bdnz 3b
1658 dcbst r6,r3 /* write it to memory */
1659 sync
1660 icbi r6,r3 /* flush the icache line */
1661 cmpld 0,r6,r5
1662 blt 4b
1663 sync
1664 addi r5,r5,8
1665 addi r6,r6,8
1666 blr
1667
1668 .align 8
1669 copy_to_here:
1670
1671 #ifdef CONFIG_SMP
1672 #ifdef CONFIG_PPC_PMAC
1673 /*
1674 * On PowerMac, secondary processors starts from the reset vector, which
1675 * is temporarily turned into a call to one of the functions below.
1676 */
1677 .section ".text";
1678 .align 2 ;
1679
1680 .globl __secondary_start_pmac_0
1681 __secondary_start_pmac_0:
1682 /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
1683 li r24,0
1684 b 1f
1685 li r24,1
1686 b 1f
1687 li r24,2
1688 b 1f
1689 li r24,3
1690 1:
1691
1692 _GLOBAL(pmac_secondary_start)
1693 /* turn on 64-bit mode */
1694 bl .enable_64b_mode
1695 isync
1696
1697 /* Copy some CPU settings from CPU 0 */
1698 bl .__restore_cpu_setup
1699
1700 /* pSeries do that early though I don't think we really need it */
1701 mfmsr r3
1702 ori r3,r3,MSR_RI
1703 mtmsrd r3 /* RI on */
1704
1705 /* Set up a paca value for this processor. */
1706 LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */
1707 mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */
1708 add r13,r13,r4 /* for this processor. */
1709 mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1710
1711 /* Create a temp kernel stack for use before relocation is on. */
1712 ld r1,PACAEMERGSP(r13)
1713 subi r1,r1,STACK_FRAME_OVERHEAD
1714
1715 b .__secondary_start
1716
1717 #endif /* CONFIG_PPC_PMAC */
1718
1719 /*
1720 * This function is called after the master CPU has released the
1721 * secondary processors. The execution environment is relocation off.
1722 * The paca for this processor has the following fields initialized at
1723 * this point:
1724 * 1. Processor number
1725 * 2. Segment table pointer (virtual address)
1726 * On entry the following are set:
1727 * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries
1728 * r24 = cpu# (in Linux terms)
1729 * r13 = paca virtual address
1730 * SPRG3 = paca virtual address
1731 */
1732 _GLOBAL(__secondary_start)
1733 /* Set thread priority to MEDIUM */
1734 HMT_MEDIUM
1735
1736 /* Load TOC */
1737 ld r2,PACATOC(r13)
1738
1739 /* Do early setup for that CPU (stab, slb, hash table pointer) */
1740 bl .early_setup_secondary
1741
1742 /* Initialize the kernel stack. Just a repeat for iSeries. */
1743 LOAD_REG_ADDR(r3, current_set)
1744 sldi r28,r24,3 /* get current_set[cpu#] */
1745 ldx r1,r3,r28
1746 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1747 std r1,PACAKSAVE(r13)
1748
1749 /* Clear backchain so we get nice backtraces */
1750 li r7,0
1751 mtlr r7
1752
1753 /* enable MMU and jump to start_secondary */
1754 LOAD_REG_ADDR(r3, .start_secondary_prolog)
1755 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1756 #ifdef DO_SOFT_DISABLE
1757 ori r4,r4,MSR_EE
1758 #endif
1759 mtspr SPRN_SRR0,r3
1760 mtspr SPRN_SRR1,r4
1761 rfid
1762 b . /* prevent speculative execution */
1763
1764 /*
1765 * Running with relocation on at this point. All we want to do is
1766 * zero the stack back-chain pointer before going into C code.
1767 */
1768 _GLOBAL(start_secondary_prolog)
1769 li r3,0
1770 std r3,0(r1) /* Zero the stack frame pointer */
1771 bl .start_secondary
1772 b .
1773 #endif
1774
1775 /*
1776 * This subroutine clobbers r11 and r12
1777 */
1778 _GLOBAL(enable_64b_mode)
1779 mfmsr r11 /* grab the current MSR */
1780 li r12,1
1781 rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1782 or r11,r11,r12
1783 li r12,1
1784 rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1785 or r11,r11,r12
1786 mtmsrd r11
1787 isync
1788 blr
1789
1790 #ifdef CONFIG_PPC_MULTIPLATFORM
1791 /*
1792 * This is where the main kernel code starts.
1793 */
1794 _STATIC(start_here_multiplatform)
1795 /* get a new offset, now that the kernel has moved. */
1796 bl .reloc_offset
1797 mr r26,r3
1798
1799 /* Clear out the BSS. It may have been done in prom_init,
1800 * already but that's irrelevant since prom_init will soon
1801 * be detached from the kernel completely. Besides, we need
1802 * to clear it now for kexec-style entry.
1803 */
1804 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1805 LOAD_REG_IMMEDIATE(r8,__bss_start)
1806 sub r11,r11,r8 /* bss size */
1807 addi r11,r11,7 /* round up to an even double word */
1808 rldicl. r11,r11,61,3 /* shift right by 3 */
1809 beq 4f
1810 addi r8,r8,-8
1811 li r0,0
1812 mtctr r11 /* zero this many doublewords */
1813 3: stdu r0,8(r8)
1814 bdnz 3b
1815 4:
1816
1817 mfmsr r6
1818 ori r6,r6,MSR_RI
1819 mtmsrd r6 /* RI on */
1820
1821 /* The following gets the stack and TOC set up with the regs */
1822 /* pointing to the real addr of the kernel stack. This is */
1823 /* all done to support the C function call below which sets */
1824 /* up the htab. This is done because we have relocated the */
1825 /* kernel but are still running in real mode. */
1826
1827 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1828 add r3,r3,r26
1829
1830 /* set up a stack pointer (physical address) */
1831 addi r1,r3,THREAD_SIZE
1832 li r0,0
1833 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1834
1835 /* set up the TOC (physical address) */
1836 LOAD_REG_IMMEDIATE(r2,__toc_start)
1837 addi r2,r2,0x4000
1838 addi r2,r2,0x4000
1839 add r2,r2,r26
1840
1841 LOAD_REG_IMMEDIATE(r3, cpu_specs)
1842 add r3,r3,r26
1843 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1844 add r4,r4,r26
1845 mr r5,r26
1846 bl .identify_cpu
1847
1848 /* Save some low level config HIDs of CPU0 to be copied to
1849 * other CPUs later on, or used for suspend/resume
1850 */
1851 bl .__save_cpu_setup
1852 sync
1853
1854 /* Do very early kernel initializations, including initial hash table,
1855 * stab and slb setup before we turn on relocation. */
1856
1857 /* Restore parameters passed from prom_init/kexec */
1858 mr r3,r31
1859 bl .early_setup
1860
1861 LOAD_REG_IMMEDIATE(r3, .start_here_common)
1862 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1863 mtspr SPRN_SRR0,r3
1864 mtspr SPRN_SRR1,r4
1865 rfid
1866 b . /* prevent speculative execution */
1867 #endif /* CONFIG_PPC_MULTIPLATFORM */
1868
1869 /* This is where all platforms converge execution */
1870 _STATIC(start_here_common)
1871 /* relocation is on at this point */
1872
1873 /* The following code sets up the SP and TOC now that we are */
1874 /* running with translation enabled. */
1875
1876 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1877
1878 /* set up the stack */
1879 addi r1,r3,THREAD_SIZE
1880 li r0,0
1881 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1882
1883 /* Apply the CPUs-specific fixups (nop out sections not relevant
1884 * to this CPU
1885 */
1886 li r3,0
1887 bl .do_cpu_ftr_fixups
1888
1889 LOAD_REG_IMMEDIATE(r26, boot_cpuid)
1890 lwz r26,0(r26)
1891
1892 LOAD_REG_IMMEDIATE(r24, paca) /* Get base vaddr of paca array */
1893 mulli r13,r26,PACA_SIZE /* Calculate vaddr of right paca */
1894 add r13,r13,r24 /* for this processor. */
1895 mtspr SPRN_SPRG3,r13
1896
1897 /* ptr to current */
1898 LOAD_REG_IMMEDIATE(r4, init_task)
1899 std r4,PACACURRENT(r13)
1900
1901 /* Load the TOC */
1902 ld r2,PACATOC(r13)
1903 std r1,PACAKSAVE(r13)
1904
1905 bl .setup_system
1906
1907 /* Load up the kernel context */
1908 5:
1909 #ifdef DO_SOFT_DISABLE
1910 li r5,0
1911 stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
1912 mfmsr r5
1913 ori r5,r5,MSR_EE /* Hard Enabled */
1914 mtmsrd r5
1915 #endif
1916
1917 bl .start_kernel
1918
1919 /* Not reached */
1920 BUG_OPCODE
1921
1922 /* Put the paca pointer into r13 and SPRG3 */
1923 _GLOBAL(setup_boot_paca)
1924 LOAD_REG_IMMEDIATE(r3, boot_cpuid)
1925 lwz r3,0(r3)
1926 LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */
1927 mulli r3,r3,PACA_SIZE /* Calculate vaddr of right paca */
1928 add r13,r3,r4 /* for this processor. */
1929 mtspr SPRN_SPRG3,r13
1930
1931 blr
1932
1933 /*
1934 * We put a few things here that have to be page-aligned.
1935 * This stuff goes at the beginning of the bss, which is page-aligned.
1936 */
1937 .section ".bss"
1938
1939 .align PAGE_SHIFT
1940
1941 .globl empty_zero_page
1942 empty_zero_page:
1943 .space PAGE_SIZE
1944
1945 .globl swapper_pg_dir
1946 swapper_pg_dir:
1947 .space PAGE_SIZE
1948
1949 /*
1950 * This space gets a copy of optional info passed to us by the bootstrap
1951 * Used to pass parameters into the kernel like root=/dev/sda1, etc.
1952 */
1953 .globl cmd_line
1954 cmd_line:
1955 .space COMMAND_LINE_SIZE
Linux kernel - Deliverables
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