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[PATCH] powerpc: Remove some unneeded fields from the paca
[deliverable/linux.git] / arch / powerpc / kernel / head_64.S
1 /*
2 * arch/ppc64/kernel/head.S
3 *
4 * PowerPC version
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 *
7 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
8 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
9 * Adapted for Power Macintosh by Paul Mackerras.
10 * Low-level exception handlers and MMU support
11 * rewritten by Paul Mackerras.
12 * Copyright (C) 1996 Paul Mackerras.
13 *
14 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
15 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
16 *
17 * This file contains the low-level support and setup for the
18 * PowerPC-64 platform, including trap and interrupt dispatch.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/config.h>
27 #include <linux/threads.h>
28 #include <asm/reg.h>
29 #include <asm/page.h>
30 #include <asm/mmu.h>
31 #include <asm/ppc_asm.h>
32 #include <asm/asm-offsets.h>
33 #include <asm/bug.h>
34 #include <asm/cputable.h>
35 #include <asm/setup.h>
36 #include <asm/hvcall.h>
37 #include <asm/iseries/lpar_map.h>
38 #include <asm/thread_info.h>
39
40 #ifdef CONFIG_PPC_ISERIES
41 #define DO_SOFT_DISABLE
42 #endif
43
44 /*
45 * We layout physical memory as follows:
46 * 0x0000 - 0x00ff : Secondary processor spin code
47 * 0x0100 - 0x2fff : pSeries Interrupt prologs
48 * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs
49 * 0x6000 - 0x6fff : Initial (CPU0) segment table
50 * 0x7000 - 0x7fff : FWNMI data area
51 * 0x8000 - : Early init and support code
52 */
53
54 /*
55 * SPRG Usage
56 *
57 * Register Definition
58 *
59 * SPRG0 reserved for hypervisor
60 * SPRG1 temp - used to save gpr
61 * SPRG2 temp - used to save gpr
62 * SPRG3 virt addr of paca
63 */
64
65 /*
66 * Entering into this code we make the following assumptions:
67 * For pSeries:
68 * 1. The MMU is off & open firmware is running in real mode.
69 * 2. The kernel is entered at __start
70 *
71 * For iSeries:
72 * 1. The MMU is on (as it always is for iSeries)
73 * 2. The kernel is entered at system_reset_iSeries
74 */
75
76 .text
77 .globl _stext
78 _stext:
79 #ifdef CONFIG_PPC_MULTIPLATFORM
80 _GLOBAL(__start)
81 /* NOP this out unconditionally */
82 BEGIN_FTR_SECTION
83 b .__start_initialization_multiplatform
84 END_FTR_SECTION(0, 1)
85 #endif /* CONFIG_PPC_MULTIPLATFORM */
86
87 /* Catch branch to 0 in real mode */
88 trap
89
90 #ifdef CONFIG_PPC_ISERIES
91 /*
92 * At offset 0x20, there is a pointer to iSeries LPAR data.
93 * This is required by the hypervisor
94 */
95 . = 0x20
96 .llong hvReleaseData-KERNELBASE
97
98 /*
99 * At offset 0x28 and 0x30 are offsets to the mschunks_map
100 * array (used by the iSeries LPAR debugger to do translation
101 * between physical addresses and absolute addresses) and
102 * to the pidhash table (also used by the debugger)
103 */
104 .llong mschunks_map-KERNELBASE
105 .llong 0 /* pidhash-KERNELBASE SFRXXX */
106
107 /* Offset 0x38 - Pointer to start of embedded System.map */
108 .globl embedded_sysmap_start
109 embedded_sysmap_start:
110 .llong 0
111 /* Offset 0x40 - Pointer to end of embedded System.map */
112 .globl embedded_sysmap_end
113 embedded_sysmap_end:
114 .llong 0
115
116 #endif /* CONFIG_PPC_ISERIES */
117
118 /* Secondary processors spin on this value until it goes to 1. */
119 .globl __secondary_hold_spinloop
120 __secondary_hold_spinloop:
121 .llong 0x0
122
123 /* Secondary processors write this value with their cpu # */
124 /* after they enter the spin loop immediately below. */
125 .globl __secondary_hold_acknowledge
126 __secondary_hold_acknowledge:
127 .llong 0x0
128
129 . = 0x60
130 /*
131 * The following code is used on pSeries to hold secondary processors
132 * in a spin loop after they have been freed from OpenFirmware, but
133 * before the bulk of the kernel has been relocated. This code
134 * is relocated to physical address 0x60 before prom_init is run.
135 * All of it must fit below the first exception vector at 0x100.
136 */
137 _GLOBAL(__secondary_hold)
138 mfmsr r24
139 ori r24,r24,MSR_RI
140 mtmsrd r24 /* RI on */
141
142 /* Grab our linux cpu number */
143 mr r24,r3
144
145 /* Tell the master cpu we're here */
146 /* Relocation is off & we are located at an address less */
147 /* than 0x100, so only need to grab low order offset. */
148 std r24,__secondary_hold_acknowledge@l(0)
149 sync
150
151 /* All secondary cpus wait here until told to start. */
152 100: ld r4,__secondary_hold_spinloop@l(0)
153 cmpdi 0,r4,1
154 bne 100b
155
156 #ifdef CONFIG_HMT
157 b .hmt_init
158 #else
159 #ifdef CONFIG_SMP
160 mr r3,r24
161 b .pSeries_secondary_smp_init
162 #else
163 BUG_OPCODE
164 #endif
165 #endif
166
167 /* This value is used to mark exception frames on the stack. */
168 .section ".toc","aw"
169 exception_marker:
170 .tc ID_72656773_68657265[TC],0x7265677368657265
171 .text
172
173 /*
174 * The following macros define the code that appears as
175 * the prologue to each of the exception handlers. They
176 * are split into two parts to allow a single kernel binary
177 * to be used for pSeries and iSeries.
178 * LOL. One day... - paulus
179 */
180
181 /*
182 * We make as much of the exception code common between native
183 * exception handlers (including pSeries LPAR) and iSeries LPAR
184 * implementations as possible.
185 */
186
187 /*
188 * This is the start of the interrupt handlers for pSeries
189 * This code runs with relocation off.
190 */
191 #define EX_R9 0
192 #define EX_R10 8
193 #define EX_R11 16
194 #define EX_R12 24
195 #define EX_R13 32
196 #define EX_SRR0 40
197 #define EX_DAR 48
198 #define EX_DSISR 56
199 #define EX_CCR 60
200 #define EX_R3 64
201 #define EX_LR 72
202
203 #define EXCEPTION_PROLOG_PSERIES(area, label) \
204 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
205 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
206 std r10,area+EX_R10(r13); \
207 std r11,area+EX_R11(r13); \
208 std r12,area+EX_R12(r13); \
209 mfspr r9,SPRN_SPRG1; \
210 std r9,area+EX_R13(r13); \
211 mfcr r9; \
212 clrrdi r12,r13,32; /* get high part of &label */ \
213 mfmsr r10; \
214 mfspr r11,SPRN_SRR0; /* save SRR0 */ \
215 ori r12,r12,(label)@l; /* virt addr of handler */ \
216 ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
217 mtspr SPRN_SRR0,r12; \
218 mfspr r12,SPRN_SRR1; /* and SRR1 */ \
219 mtspr SPRN_SRR1,r10; \
220 rfid; \
221 b . /* prevent speculative execution */
222
223 /*
224 * This is the start of the interrupt handlers for iSeries
225 * This code runs with relocation on.
226 */
227 #define EXCEPTION_PROLOG_ISERIES_1(area) \
228 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
229 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
230 std r10,area+EX_R10(r13); \
231 std r11,area+EX_R11(r13); \
232 std r12,area+EX_R12(r13); \
233 mfspr r9,SPRN_SPRG1; \
234 std r9,area+EX_R13(r13); \
235 mfcr r9
236
237 #define EXCEPTION_PROLOG_ISERIES_2 \
238 mfmsr r10; \
239 ld r11,PACALPPACA+LPPACASRR0(r13); \
240 ld r12,PACALPPACA+LPPACASRR1(r13); \
241 ori r10,r10,MSR_RI; \
242 mtmsrd r10,1
243
244 /*
245 * The common exception prolog is used for all except a few exceptions
246 * such as a segment miss on a kernel address. We have to be prepared
247 * to take another exception from the point where we first touch the
248 * kernel stack onwards.
249 *
250 * On entry r13 points to the paca, r9-r13 are saved in the paca,
251 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
252 * SRR1, and relocation is on.
253 */
254 #define EXCEPTION_PROLOG_COMMON(n, area) \
255 andi. r10,r12,MSR_PR; /* See if coming from user */ \
256 mr r10,r1; /* Save r1 */ \
257 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
258 beq- 1f; \
259 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
260 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
261 bge- cr1,bad_stack; /* abort if it is */ \
262 std r9,_CCR(r1); /* save CR in stackframe */ \
263 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
264 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
265 std r10,0(r1); /* make stack chain pointer */ \
266 std r0,GPR0(r1); /* save r0 in stackframe */ \
267 std r10,GPR1(r1); /* save r1 in stackframe */ \
268 std r2,GPR2(r1); /* save r2 in stackframe */ \
269 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
270 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
271 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
272 ld r10,area+EX_R10(r13); \
273 std r9,GPR9(r1); \
274 std r10,GPR10(r1); \
275 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
276 ld r10,area+EX_R12(r13); \
277 ld r11,area+EX_R13(r13); \
278 std r9,GPR11(r1); \
279 std r10,GPR12(r1); \
280 std r11,GPR13(r1); \
281 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
282 mflr r9; /* save LR in stackframe */ \
283 std r9,_LINK(r1); \
284 mfctr r10; /* save CTR in stackframe */ \
285 std r10,_CTR(r1); \
286 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
287 std r11,_XER(r1); \
288 li r9,(n)+1; \
289 std r9,_TRAP(r1); /* set trap number */ \
290 li r10,0; \
291 ld r11,exception_marker@toc(r2); \
292 std r10,RESULT(r1); /* clear regs->result */ \
293 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
294
295 /*
296 * Exception vectors.
297 */
298 #define STD_EXCEPTION_PSERIES(n, label) \
299 . = n; \
300 .globl label##_pSeries; \
301 label##_pSeries: \
302 HMT_MEDIUM; \
303 mtspr SPRN_SPRG1,r13; /* save r13 */ \
304 RUNLATCH_ON(r13); \
305 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
306
307 #define STD_EXCEPTION_ISERIES(n, label, area) \
308 .globl label##_iSeries; \
309 label##_iSeries: \
310 HMT_MEDIUM; \
311 mtspr SPRN_SPRG1,r13; /* save r13 */ \
312 RUNLATCH_ON(r13); \
313 EXCEPTION_PROLOG_ISERIES_1(area); \
314 EXCEPTION_PROLOG_ISERIES_2; \
315 b label##_common
316
317 #define MASKABLE_EXCEPTION_ISERIES(n, label) \
318 .globl label##_iSeries; \
319 label##_iSeries: \
320 HMT_MEDIUM; \
321 mtspr SPRN_SPRG1,r13; /* save r13 */ \
322 RUNLATCH_ON(r13); \
323 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
324 lbz r10,PACAPROCENABLED(r13); \
325 cmpwi 0,r10,0; \
326 beq- label##_iSeries_masked; \
327 EXCEPTION_PROLOG_ISERIES_2; \
328 b label##_common; \
329
330 #ifdef DO_SOFT_DISABLE
331 #define DISABLE_INTS \
332 lbz r10,PACAPROCENABLED(r13); \
333 li r11,0; \
334 std r10,SOFTE(r1); \
335 mfmsr r10; \
336 stb r11,PACAPROCENABLED(r13); \
337 ori r10,r10,MSR_EE; \
338 mtmsrd r10,1
339
340 #define ENABLE_INTS \
341 lbz r10,PACAPROCENABLED(r13); \
342 mfmsr r11; \
343 std r10,SOFTE(r1); \
344 ori r11,r11,MSR_EE; \
345 mtmsrd r11,1
346
347 #else /* hard enable/disable interrupts */
348 #define DISABLE_INTS
349
350 #define ENABLE_INTS \
351 ld r12,_MSR(r1); \
352 mfmsr r11; \
353 rlwimi r11,r12,0,MSR_EE; \
354 mtmsrd r11,1
355
356 #endif
357
358 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
359 .align 7; \
360 .globl label##_common; \
361 label##_common: \
362 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
363 DISABLE_INTS; \
364 bl .save_nvgprs; \
365 addi r3,r1,STACK_FRAME_OVERHEAD; \
366 bl hdlr; \
367 b .ret_from_except
368
369 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
370 .align 7; \
371 .globl label##_common; \
372 label##_common: \
373 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
374 DISABLE_INTS; \
375 addi r3,r1,STACK_FRAME_OVERHEAD; \
376 bl hdlr; \
377 b .ret_from_except_lite
378
379 /*
380 * Start of pSeries system interrupt routines
381 */
382 . = 0x100
383 .globl __start_interrupts
384 __start_interrupts:
385
386 STD_EXCEPTION_PSERIES(0x100, system_reset)
387
388 . = 0x200
389 _machine_check_pSeries:
390 HMT_MEDIUM
391 mtspr SPRN_SPRG1,r13 /* save r13 */
392 RUNLATCH_ON(r13)
393 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
394
395 . = 0x300
396 .globl data_access_pSeries
397 data_access_pSeries:
398 HMT_MEDIUM
399 mtspr SPRN_SPRG1,r13
400 BEGIN_FTR_SECTION
401 mtspr SPRN_SPRG2,r12
402 mfspr r13,SPRN_DAR
403 mfspr r12,SPRN_DSISR
404 srdi r13,r13,60
405 rlwimi r13,r12,16,0x20
406 mfcr r12
407 cmpwi r13,0x2c
408 beq .do_stab_bolted_pSeries
409 mtcrf 0x80,r12
410 mfspr r12,SPRN_SPRG2
411 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
412 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
413
414 . = 0x380
415 .globl data_access_slb_pSeries
416 data_access_slb_pSeries:
417 HMT_MEDIUM
418 mtspr SPRN_SPRG1,r13
419 RUNLATCH_ON(r13)
420 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
421 std r3,PACA_EXSLB+EX_R3(r13)
422 mfspr r3,SPRN_DAR
423 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
424 mfcr r9
425 #ifdef __DISABLED__
426 /* Keep that around for when we re-implement dynamic VSIDs */
427 cmpdi r3,0
428 bge slb_miss_user_pseries
429 #endif /* __DISABLED__ */
430 std r10,PACA_EXSLB+EX_R10(r13)
431 std r11,PACA_EXSLB+EX_R11(r13)
432 std r12,PACA_EXSLB+EX_R12(r13)
433 mfspr r10,SPRN_SPRG1
434 std r10,PACA_EXSLB+EX_R13(r13)
435 mfspr r12,SPRN_SRR1 /* and SRR1 */
436 b .slb_miss_realmode /* Rel. branch works in real mode */
437
438 STD_EXCEPTION_PSERIES(0x400, instruction_access)
439
440 . = 0x480
441 .globl instruction_access_slb_pSeries
442 instruction_access_slb_pSeries:
443 HMT_MEDIUM
444 mtspr SPRN_SPRG1,r13
445 RUNLATCH_ON(r13)
446 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
447 std r3,PACA_EXSLB+EX_R3(r13)
448 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
449 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
450 mfcr r9
451 #ifdef __DISABLED__
452 /* Keep that around for when we re-implement dynamic VSIDs */
453 cmpdi r3,0
454 bge slb_miss_user_pseries
455 #endif /* __DISABLED__ */
456 std r10,PACA_EXSLB+EX_R10(r13)
457 std r11,PACA_EXSLB+EX_R11(r13)
458 std r12,PACA_EXSLB+EX_R12(r13)
459 mfspr r10,SPRN_SPRG1
460 std r10,PACA_EXSLB+EX_R13(r13)
461 mfspr r12,SPRN_SRR1 /* and SRR1 */
462 b .slb_miss_realmode /* Rel. branch works in real mode */
463
464 STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
465 STD_EXCEPTION_PSERIES(0x600, alignment)
466 STD_EXCEPTION_PSERIES(0x700, program_check)
467 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
468 STD_EXCEPTION_PSERIES(0x900, decrementer)
469 STD_EXCEPTION_PSERIES(0xa00, trap_0a)
470 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
471
472 . = 0xc00
473 .globl system_call_pSeries
474 system_call_pSeries:
475 HMT_MEDIUM
476 RUNLATCH_ON(r9)
477 mr r9,r13
478 mfmsr r10
479 mfspr r13,SPRN_SPRG3
480 mfspr r11,SPRN_SRR0
481 clrrdi r12,r13,32
482 oris r12,r12,system_call_common@h
483 ori r12,r12,system_call_common@l
484 mtspr SPRN_SRR0,r12
485 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
486 mfspr r12,SPRN_SRR1
487 mtspr SPRN_SRR1,r10
488 rfid
489 b . /* prevent speculative execution */
490
491 STD_EXCEPTION_PSERIES(0xd00, single_step)
492 STD_EXCEPTION_PSERIES(0xe00, trap_0e)
493
494 /* We need to deal with the Altivec unavailable exception
495 * here which is at 0xf20, thus in the middle of the
496 * prolog code of the PerformanceMonitor one. A little
497 * trickery is thus necessary
498 */
499 . = 0xf00
500 b performance_monitor_pSeries
501
502 STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
503
504 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
505 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
506
507 . = 0x3000
508
509 /*** pSeries interrupt support ***/
510
511 /* moved from 0xf00 */
512 STD_EXCEPTION_PSERIES(., performance_monitor)
513
514 .align 7
515 _GLOBAL(do_stab_bolted_pSeries)
516 mtcrf 0x80,r12
517 mfspr r12,SPRN_SPRG2
518 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
519
520 /*
521 * We have some room here we use that to put
522 * the peries slb miss user trampoline code so it's reasonably
523 * away from slb_miss_user_common to avoid problems with rfid
524 *
525 * This is used for when the SLB miss handler has to go virtual,
526 * which doesn't happen for now anymore but will once we re-implement
527 * dynamic VSIDs for shared page tables
528 */
529 #ifdef __DISABLED__
530 slb_miss_user_pseries:
531 std r10,PACA_EXGEN+EX_R10(r13)
532 std r11,PACA_EXGEN+EX_R11(r13)
533 std r12,PACA_EXGEN+EX_R12(r13)
534 mfspr r10,SPRG1
535 ld r11,PACA_EXSLB+EX_R9(r13)
536 ld r12,PACA_EXSLB+EX_R3(r13)
537 std r10,PACA_EXGEN+EX_R13(r13)
538 std r11,PACA_EXGEN+EX_R9(r13)
539 std r12,PACA_EXGEN+EX_R3(r13)
540 clrrdi r12,r13,32
541 mfmsr r10
542 mfspr r11,SRR0 /* save SRR0 */
543 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
544 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
545 mtspr SRR0,r12
546 mfspr r12,SRR1 /* and SRR1 */
547 mtspr SRR1,r10
548 rfid
549 b . /* prevent spec. execution */
550 #endif /* __DISABLED__ */
551
552 /*
553 * Vectors for the FWNMI option. Share common code.
554 */
555 .globl system_reset_fwnmi
556 system_reset_fwnmi:
557 HMT_MEDIUM
558 mtspr SPRN_SPRG1,r13 /* save r13 */
559 RUNLATCH_ON(r13)
560 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
561
562 .globl machine_check_fwnmi
563 machine_check_fwnmi:
564 HMT_MEDIUM
565 mtspr SPRN_SPRG1,r13 /* save r13 */
566 RUNLATCH_ON(r13)
567 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
568
569 #ifdef CONFIG_PPC_ISERIES
570 /*** ISeries-LPAR interrupt handlers ***/
571
572 STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
573
574 .globl data_access_iSeries
575 data_access_iSeries:
576 mtspr SPRN_SPRG1,r13
577 BEGIN_FTR_SECTION
578 mtspr SPRN_SPRG2,r12
579 mfspr r13,SPRN_DAR
580 mfspr r12,SPRN_DSISR
581 srdi r13,r13,60
582 rlwimi r13,r12,16,0x20
583 mfcr r12
584 cmpwi r13,0x2c
585 beq .do_stab_bolted_iSeries
586 mtcrf 0x80,r12
587 mfspr r12,SPRN_SPRG2
588 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
589 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
590 EXCEPTION_PROLOG_ISERIES_2
591 b data_access_common
592
593 .do_stab_bolted_iSeries:
594 mtcrf 0x80,r12
595 mfspr r12,SPRN_SPRG2
596 EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
597 EXCEPTION_PROLOG_ISERIES_2
598 b .do_stab_bolted
599
600 .globl data_access_slb_iSeries
601 data_access_slb_iSeries:
602 mtspr SPRN_SPRG1,r13 /* save r13 */
603 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
604 std r3,PACA_EXSLB+EX_R3(r13)
605 mfspr r3,SPRN_DAR
606 std r9,PACA_EXSLB+EX_R9(r13)
607 mfcr r9
608 #ifdef __DISABLED__
609 cmpdi r3,0
610 bge slb_miss_user_iseries
611 #endif
612 std r10,PACA_EXSLB+EX_R10(r13)
613 std r11,PACA_EXSLB+EX_R11(r13)
614 std r12,PACA_EXSLB+EX_R12(r13)
615 mfspr r10,SPRN_SPRG1
616 std r10,PACA_EXSLB+EX_R13(r13)
617 ld r12,PACALPPACA+LPPACASRR1(r13);
618 b .slb_miss_realmode
619
620 STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
621
622 .globl instruction_access_slb_iSeries
623 instruction_access_slb_iSeries:
624 mtspr SPRN_SPRG1,r13 /* save r13 */
625 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
626 std r3,PACA_EXSLB+EX_R3(r13)
627 ld r3,PACALPPACA+LPPACASRR0(r13) /* get SRR0 value */
628 std r9,PACA_EXSLB+EX_R9(r13)
629 mfcr r9
630 #ifdef __DISABLED__
631 cmpdi r3,0
632 bge .slb_miss_user_iseries
633 #endif
634 std r10,PACA_EXSLB+EX_R10(r13)
635 std r11,PACA_EXSLB+EX_R11(r13)
636 std r12,PACA_EXSLB+EX_R12(r13)
637 mfspr r10,SPRN_SPRG1
638 std r10,PACA_EXSLB+EX_R13(r13)
639 ld r12,PACALPPACA+LPPACASRR1(r13);
640 b .slb_miss_realmode
641
642 #ifdef __DISABLED__
643 slb_miss_user_iseries:
644 std r10,PACA_EXGEN+EX_R10(r13)
645 std r11,PACA_EXGEN+EX_R11(r13)
646 std r12,PACA_EXGEN+EX_R12(r13)
647 mfspr r10,SPRG1
648 ld r11,PACA_EXSLB+EX_R9(r13)
649 ld r12,PACA_EXSLB+EX_R3(r13)
650 std r10,PACA_EXGEN+EX_R13(r13)
651 std r11,PACA_EXGEN+EX_R9(r13)
652 std r12,PACA_EXGEN+EX_R3(r13)
653 EXCEPTION_PROLOG_ISERIES_2
654 b slb_miss_user_common
655 #endif
656
657 MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
658 STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
659 STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
660 STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
661 MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
662 STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
663 STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
664
665 .globl system_call_iSeries
666 system_call_iSeries:
667 mr r9,r13
668 mfspr r13,SPRN_SPRG3
669 EXCEPTION_PROLOG_ISERIES_2
670 b system_call_common
671
672 STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
673 STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
674 STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
675
676 .globl system_reset_iSeries
677 system_reset_iSeries:
678 mfspr r13,SPRN_SPRG3 /* Get paca address */
679 mfmsr r24
680 ori r24,r24,MSR_RI
681 mtmsrd r24 /* RI on */
682 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
683 cmpwi 0,r24,0 /* Are we processor 0? */
684 beq .__start_initialization_iSeries /* Start up the first processor */
685 mfspr r4,SPRN_CTRLF
686 li r5,CTRL_RUNLATCH /* Turn off the run light */
687 andc r4,r4,r5
688 mtspr SPRN_CTRLT,r4
689
690 1:
691 HMT_LOW
692 #ifdef CONFIG_SMP
693 lbz r23,PACAPROCSTART(r13) /* Test if this processor
694 * should start */
695 sync
696 LOADADDR(r3,current_set)
697 sldi r28,r24,3 /* get current_set[cpu#] */
698 ldx r3,r3,r28
699 addi r1,r3,THREAD_SIZE
700 subi r1,r1,STACK_FRAME_OVERHEAD
701
702 cmpwi 0,r23,0
703 beq iSeries_secondary_smp_loop /* Loop until told to go */
704 bne .__secondary_start /* Loop until told to go */
705 iSeries_secondary_smp_loop:
706 /* Let the Hypervisor know we are alive */
707 /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
708 lis r3,0x8002
709 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
710 #else /* CONFIG_SMP */
711 /* Yield the processor. This is required for non-SMP kernels
712 which are running on multi-threaded machines. */
713 lis r3,0x8000
714 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
715 addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
716 li r4,0 /* "yield timed" */
717 li r5,-1 /* "yield forever" */
718 #endif /* CONFIG_SMP */
719 li r0,-1 /* r0=-1 indicates a Hypervisor call */
720 sc /* Invoke the hypervisor via a system call */
721 mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
722 b 1b /* If SMP not configured, secondaries
723 * loop forever */
724
725 .globl decrementer_iSeries_masked
726 decrementer_iSeries_masked:
727 li r11,1
728 stb r11,PACALPPACA+LPPACADECRINT(r13)
729 LOADBASE(r12,tb_ticks_per_jiffy)
730 lwz r12,OFF(tb_ticks_per_jiffy)(r13)
731 mtspr SPRN_DEC,r12
732 /* fall through */
733
734 .globl hardware_interrupt_iSeries_masked
735 hardware_interrupt_iSeries_masked:
736 mtcrf 0x80,r9 /* Restore regs */
737 ld r11,PACALPPACA+LPPACASRR0(r13)
738 ld r12,PACALPPACA+LPPACASRR1(r13)
739 mtspr SPRN_SRR0,r11
740 mtspr SPRN_SRR1,r12
741 ld r9,PACA_EXGEN+EX_R9(r13)
742 ld r10,PACA_EXGEN+EX_R10(r13)
743 ld r11,PACA_EXGEN+EX_R11(r13)
744 ld r12,PACA_EXGEN+EX_R12(r13)
745 ld r13,PACA_EXGEN+EX_R13(r13)
746 rfid
747 b . /* prevent speculative execution */
748 #endif /* CONFIG_PPC_ISERIES */
749
750 /*** Common interrupt handlers ***/
751
752 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
753
754 /*
755 * Machine check is different because we use a different
756 * save area: PACA_EXMC instead of PACA_EXGEN.
757 */
758 .align 7
759 .globl machine_check_common
760 machine_check_common:
761 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
762 DISABLE_INTS
763 bl .save_nvgprs
764 addi r3,r1,STACK_FRAME_OVERHEAD
765 bl .machine_check_exception
766 b .ret_from_except
767
768 STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt)
769 STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
770 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
771 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
772 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
773 STD_EXCEPTION_COMMON(0xf00, performance_monitor, .performance_monitor_exception)
774 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
775 #ifdef CONFIG_ALTIVEC
776 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
777 #else
778 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
779 #endif
780
781 /*
782 * Here we have detected that the kernel stack pointer is bad.
783 * R9 contains the saved CR, r13 points to the paca,
784 * r10 contains the (bad) kernel stack pointer,
785 * r11 and r12 contain the saved SRR0 and SRR1.
786 * We switch to using an emergency stack, save the registers there,
787 * and call kernel_bad_stack(), which panics.
788 */
789 bad_stack:
790 ld r1,PACAEMERGSP(r13)
791 subi r1,r1,64+INT_FRAME_SIZE
792 std r9,_CCR(r1)
793 std r10,GPR1(r1)
794 std r11,_NIP(r1)
795 std r12,_MSR(r1)
796 mfspr r11,SPRN_DAR
797 mfspr r12,SPRN_DSISR
798 std r11,_DAR(r1)
799 std r12,_DSISR(r1)
800 mflr r10
801 mfctr r11
802 mfxer r12
803 std r10,_LINK(r1)
804 std r11,_CTR(r1)
805 std r12,_XER(r1)
806 SAVE_GPR(0,r1)
807 SAVE_GPR(2,r1)
808 SAVE_4GPRS(3,r1)
809 SAVE_2GPRS(7,r1)
810 SAVE_10GPRS(12,r1)
811 SAVE_10GPRS(22,r1)
812 addi r11,r1,INT_FRAME_SIZE
813 std r11,0(r1)
814 li r12,0
815 std r12,0(r11)
816 ld r2,PACATOC(r13)
817 1: addi r3,r1,STACK_FRAME_OVERHEAD
818 bl .kernel_bad_stack
819 b 1b
820
821 /*
822 * Return from an exception with minimal checks.
823 * The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
824 * If interrupts have been enabled, or anything has been
825 * done that might have changed the scheduling status of
826 * any task or sent any task a signal, you should use
827 * ret_from_except or ret_from_except_lite instead of this.
828 */
829 .globl fast_exception_return
830 fast_exception_return:
831 ld r12,_MSR(r1)
832 ld r11,_NIP(r1)
833 andi. r3,r12,MSR_RI /* check if RI is set */
834 beq- unrecov_fer
835 ld r3,_CCR(r1)
836 ld r4,_LINK(r1)
837 ld r5,_CTR(r1)
838 ld r6,_XER(r1)
839 mtcr r3
840 mtlr r4
841 mtctr r5
842 mtxer r6
843 REST_GPR(0, r1)
844 REST_8GPRS(2, r1)
845
846 mfmsr r10
847 clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
848 mtmsrd r10,1
849
850 mtspr SPRN_SRR1,r12
851 mtspr SPRN_SRR0,r11
852 REST_4GPRS(10, r1)
853 ld r1,GPR1(r1)
854 rfid
855 b . /* prevent speculative execution */
856
857 unrecov_fer:
858 bl .save_nvgprs
859 1: addi r3,r1,STACK_FRAME_OVERHEAD
860 bl .unrecoverable_exception
861 b 1b
862
863 /*
864 * Here r13 points to the paca, r9 contains the saved CR,
865 * SRR0 and SRR1 are saved in r11 and r12,
866 * r9 - r13 are saved in paca->exgen.
867 */
868 .align 7
869 .globl data_access_common
870 data_access_common:
871 RUNLATCH_ON(r10) /* It wont fit in the 0x300 handler */
872 mfspr r10,SPRN_DAR
873 std r10,PACA_EXGEN+EX_DAR(r13)
874 mfspr r10,SPRN_DSISR
875 stw r10,PACA_EXGEN+EX_DSISR(r13)
876 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
877 ld r3,PACA_EXGEN+EX_DAR(r13)
878 lwz r4,PACA_EXGEN+EX_DSISR(r13)
879 li r5,0x300
880 b .do_hash_page /* Try to handle as hpte fault */
881
882 .align 7
883 .globl instruction_access_common
884 instruction_access_common:
885 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
886 ld r3,_NIP(r1)
887 andis. r4,r12,0x5820
888 li r5,0x400
889 b .do_hash_page /* Try to handle as hpte fault */
890
891 /*
892 * Here is the common SLB miss user that is used when going to virtual
893 * mode for SLB misses, that is currently not used
894 */
895 #ifdef __DISABLED__
896 .align 7
897 .globl slb_miss_user_common
898 slb_miss_user_common:
899 mflr r10
900 std r3,PACA_EXGEN+EX_DAR(r13)
901 stw r9,PACA_EXGEN+EX_CCR(r13)
902 std r10,PACA_EXGEN+EX_LR(r13)
903 std r11,PACA_EXGEN+EX_SRR0(r13)
904 bl .slb_allocate_user
905
906 ld r10,PACA_EXGEN+EX_LR(r13)
907 ld r3,PACA_EXGEN+EX_R3(r13)
908 lwz r9,PACA_EXGEN+EX_CCR(r13)
909 ld r11,PACA_EXGEN+EX_SRR0(r13)
910 mtlr r10
911 beq- slb_miss_fault
912
913 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
914 beq- unrecov_user_slb
915 mfmsr r10
916
917 .machine push
918 .machine "power4"
919 mtcrf 0x80,r9
920 .machine pop
921
922 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
923 mtmsrd r10,1
924
925 mtspr SRR0,r11
926 mtspr SRR1,r12
927
928 ld r9,PACA_EXGEN+EX_R9(r13)
929 ld r10,PACA_EXGEN+EX_R10(r13)
930 ld r11,PACA_EXGEN+EX_R11(r13)
931 ld r12,PACA_EXGEN+EX_R12(r13)
932 ld r13,PACA_EXGEN+EX_R13(r13)
933 rfid
934 b .
935
936 slb_miss_fault:
937 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
938 ld r4,PACA_EXGEN+EX_DAR(r13)
939 li r5,0
940 std r4,_DAR(r1)
941 std r5,_DSISR(r1)
942 b .handle_page_fault
943
944 unrecov_user_slb:
945 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
946 DISABLE_INTS
947 bl .save_nvgprs
948 1: addi r3,r1,STACK_FRAME_OVERHEAD
949 bl .unrecoverable_exception
950 b 1b
951
952 #endif /* __DISABLED__ */
953
954
955 /*
956 * r13 points to the PACA, r9 contains the saved CR,
957 * r12 contain the saved SRR1, SRR0 is still ready for return
958 * r3 has the faulting address
959 * r9 - r13 are saved in paca->exslb.
960 * r3 is saved in paca->slb_r3
961 * We assume we aren't going to take any exceptions during this procedure.
962 */
963 _GLOBAL(slb_miss_realmode)
964 mflr r10
965
966 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
967 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
968
969 bl .slb_allocate_realmode
970
971 /* All done -- return from exception. */
972
973 ld r10,PACA_EXSLB+EX_LR(r13)
974 ld r3,PACA_EXSLB+EX_R3(r13)
975 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
976 #ifdef CONFIG_PPC_ISERIES
977 ld r11,PACALPPACA+LPPACASRR0(r13) /* get SRR0 value */
978 #endif /* CONFIG_PPC_ISERIES */
979
980 mtlr r10
981
982 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
983 beq- unrecov_slb
984
985 .machine push
986 .machine "power4"
987 mtcrf 0x80,r9
988 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
989 .machine pop
990
991 #ifdef CONFIG_PPC_ISERIES
992 mtspr SPRN_SRR0,r11
993 mtspr SPRN_SRR1,r12
994 #endif /* CONFIG_PPC_ISERIES */
995 ld r9,PACA_EXSLB+EX_R9(r13)
996 ld r10,PACA_EXSLB+EX_R10(r13)
997 ld r11,PACA_EXSLB+EX_R11(r13)
998 ld r12,PACA_EXSLB+EX_R12(r13)
999 ld r13,PACA_EXSLB+EX_R13(r13)
1000 rfid
1001 b . /* prevent speculative execution */
1002
1003 unrecov_slb:
1004 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1005 DISABLE_INTS
1006 bl .save_nvgprs
1007 1: addi r3,r1,STACK_FRAME_OVERHEAD
1008 bl .unrecoverable_exception
1009 b 1b
1010
1011 .align 7
1012 .globl hardware_interrupt_common
1013 .globl hardware_interrupt_entry
1014 hardware_interrupt_common:
1015 EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
1016 hardware_interrupt_entry:
1017 DISABLE_INTS
1018 addi r3,r1,STACK_FRAME_OVERHEAD
1019 bl .do_IRQ
1020 b .ret_from_except_lite
1021
1022 .align 7
1023 .globl alignment_common
1024 alignment_common:
1025 mfspr r10,SPRN_DAR
1026 std r10,PACA_EXGEN+EX_DAR(r13)
1027 mfspr r10,SPRN_DSISR
1028 stw r10,PACA_EXGEN+EX_DSISR(r13)
1029 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1030 ld r3,PACA_EXGEN+EX_DAR(r13)
1031 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1032 std r3,_DAR(r1)
1033 std r4,_DSISR(r1)
1034 bl .save_nvgprs
1035 addi r3,r1,STACK_FRAME_OVERHEAD
1036 ENABLE_INTS
1037 bl .alignment_exception
1038 b .ret_from_except
1039
1040 .align 7
1041 .globl program_check_common
1042 program_check_common:
1043 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1044 bl .save_nvgprs
1045 addi r3,r1,STACK_FRAME_OVERHEAD
1046 ENABLE_INTS
1047 bl .program_check_exception
1048 b .ret_from_except
1049
1050 .align 7
1051 .globl fp_unavailable_common
1052 fp_unavailable_common:
1053 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1054 bne .load_up_fpu /* if from user, just load it up */
1055 bl .save_nvgprs
1056 addi r3,r1,STACK_FRAME_OVERHEAD
1057 ENABLE_INTS
1058 bl .kernel_fp_unavailable_exception
1059 BUG_OPCODE
1060
1061 .align 7
1062 .globl altivec_unavailable_common
1063 altivec_unavailable_common:
1064 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1065 #ifdef CONFIG_ALTIVEC
1066 BEGIN_FTR_SECTION
1067 bne .load_up_altivec /* if from user, just load it up */
1068 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1069 #endif
1070 bl .save_nvgprs
1071 addi r3,r1,STACK_FRAME_OVERHEAD
1072 ENABLE_INTS
1073 bl .altivec_unavailable_exception
1074 b .ret_from_except
1075
1076 #ifdef CONFIG_ALTIVEC
1077 /*
1078 * load_up_altivec(unused, unused, tsk)
1079 * Disable VMX for the task which had it previously,
1080 * and save its vector registers in its thread_struct.
1081 * Enables the VMX for use in the kernel on return.
1082 * On SMP we know the VMX is free, since we give it up every
1083 * switch (ie, no lazy save of the vector registers).
1084 * On entry: r13 == 'current' && last_task_used_altivec != 'current'
1085 */
1086 _STATIC(load_up_altivec)
1087 mfmsr r5 /* grab the current MSR */
1088 oris r5,r5,MSR_VEC@h
1089 mtmsrd r5 /* enable use of VMX now */
1090 isync
1091
1092 /*
1093 * For SMP, we don't do lazy VMX switching because it just gets too
1094 * horrendously complex, especially when a task switches from one CPU
1095 * to another. Instead we call giveup_altvec in switch_to.
1096 * VRSAVE isn't dealt with here, that is done in the normal context
1097 * switch code. Note that we could rely on vrsave value to eventually
1098 * avoid saving all of the VREGs here...
1099 */
1100 #ifndef CONFIG_SMP
1101 ld r3,last_task_used_altivec@got(r2)
1102 ld r4,0(r3)
1103 cmpdi 0,r4,0
1104 beq 1f
1105 /* Save VMX state to last_task_used_altivec's THREAD struct */
1106 addi r4,r4,THREAD
1107 SAVE_32VRS(0,r5,r4)
1108 mfvscr vr0
1109 li r10,THREAD_VSCR
1110 stvx vr0,r10,r4
1111 /* Disable VMX for last_task_used_altivec */
1112 ld r5,PT_REGS(r4)
1113 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1114 lis r6,MSR_VEC@h
1115 andc r4,r4,r6
1116 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1117 1:
1118 #endif /* CONFIG_SMP */
1119 /* Hack: if we get an altivec unavailable trap with VRSAVE
1120 * set to all zeros, we assume this is a broken application
1121 * that fails to set it properly, and thus we switch it to
1122 * all 1's
1123 */
1124 mfspr r4,SPRN_VRSAVE
1125 cmpdi 0,r4,0
1126 bne+ 1f
1127 li r4,-1
1128 mtspr SPRN_VRSAVE,r4
1129 1:
1130 /* enable use of VMX after return */
1131 ld r4,PACACURRENT(r13)
1132 addi r5,r4,THREAD /* Get THREAD */
1133 oris r12,r12,MSR_VEC@h
1134 std r12,_MSR(r1)
1135 li r4,1
1136 li r10,THREAD_VSCR
1137 stw r4,THREAD_USED_VR(r5)
1138 lvx vr0,r10,r5
1139 mtvscr vr0
1140 REST_32VRS(0,r4,r5)
1141 #ifndef CONFIG_SMP
1142 /* Update last_task_used_math to 'current' */
1143 subi r4,r5,THREAD /* Back to 'current' */
1144 std r4,0(r3)
1145 #endif /* CONFIG_SMP */
1146 /* restore registers and return */
1147 b fast_exception_return
1148 #endif /* CONFIG_ALTIVEC */
1149
1150 /*
1151 * Hash table stuff
1152 */
1153 .align 7
1154 _GLOBAL(do_hash_page)
1155 std r3,_DAR(r1)
1156 std r4,_DSISR(r1)
1157
1158 andis. r0,r4,0xa450 /* weird error? */
1159 bne- .handle_page_fault /* if not, try to insert a HPTE */
1160 BEGIN_FTR_SECTION
1161 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1162 bne- .do_ste_alloc /* If so handle it */
1163 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1164
1165 /*
1166 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1167 * accessing a userspace segment (even from the kernel). We assume
1168 * kernel addresses always have the high bit set.
1169 */
1170 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1171 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1172 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1173 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1174 ori r4,r4,1 /* add _PAGE_PRESENT */
1175 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1176
1177 /*
1178 * On iSeries, we soft-disable interrupts here, then
1179 * hard-enable interrupts so that the hash_page code can spin on
1180 * the hash_table_lock without problems on a shared processor.
1181 */
1182 DISABLE_INTS
1183
1184 /*
1185 * r3 contains the faulting address
1186 * r4 contains the required access permissions
1187 * r5 contains the trap number
1188 *
1189 * at return r3 = 0 for success
1190 */
1191 bl .hash_page /* build HPTE if possible */
1192 cmpdi r3,0 /* see if hash_page succeeded */
1193
1194 #ifdef DO_SOFT_DISABLE
1195 /*
1196 * If we had interrupts soft-enabled at the point where the
1197 * DSI/ISI occurred, and an interrupt came in during hash_page,
1198 * handle it now.
1199 * We jump to ret_from_except_lite rather than fast_exception_return
1200 * because ret_from_except_lite will check for and handle pending
1201 * interrupts if necessary.
1202 */
1203 beq .ret_from_except_lite
1204 /* For a hash failure, we don't bother re-enabling interrupts */
1205 ble- 12f
1206
1207 /*
1208 * hash_page couldn't handle it, set soft interrupt enable back
1209 * to what it was before the trap. Note that .local_irq_restore
1210 * handles any interrupts pending at this point.
1211 */
1212 ld r3,SOFTE(r1)
1213 bl .local_irq_restore
1214 b 11f
1215 #else
1216 beq fast_exception_return /* Return from exception on success */
1217 ble- 12f /* Failure return from hash_page */
1218
1219 /* fall through */
1220 #endif
1221
1222 /* Here we have a page fault that hash_page can't handle. */
1223 _GLOBAL(handle_page_fault)
1224 ENABLE_INTS
1225 11: ld r4,_DAR(r1)
1226 ld r5,_DSISR(r1)
1227 addi r3,r1,STACK_FRAME_OVERHEAD
1228 bl .do_page_fault
1229 cmpdi r3,0
1230 beq+ .ret_from_except_lite
1231 bl .save_nvgprs
1232 mr r5,r3
1233 addi r3,r1,STACK_FRAME_OVERHEAD
1234 lwz r4,_DAR(r1)
1235 bl .bad_page_fault
1236 b .ret_from_except
1237
1238 /* We have a page fault that hash_page could handle but HV refused
1239 * the PTE insertion
1240 */
1241 12: bl .save_nvgprs
1242 addi r3,r1,STACK_FRAME_OVERHEAD
1243 lwz r4,_DAR(r1)
1244 bl .low_hash_fault
1245 b .ret_from_except
1246
1247 /* here we have a segment miss */
1248 _GLOBAL(do_ste_alloc)
1249 bl .ste_allocate /* try to insert stab entry */
1250 cmpdi r3,0
1251 beq+ fast_exception_return
1252 b .handle_page_fault
1253
1254 /*
1255 * r13 points to the PACA, r9 contains the saved CR,
1256 * r11 and r12 contain the saved SRR0 and SRR1.
1257 * r9 - r13 are saved in paca->exslb.
1258 * We assume we aren't going to take any exceptions during this procedure.
1259 * We assume (DAR >> 60) == 0xc.
1260 */
1261 .align 7
1262 _GLOBAL(do_stab_bolted)
1263 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1264 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1265
1266 /* Hash to the primary group */
1267 ld r10,PACASTABVIRT(r13)
1268 mfspr r11,SPRN_DAR
1269 srdi r11,r11,28
1270 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1271
1272 /* Calculate VSID */
1273 /* This is a kernel address, so protovsid = ESID */
1274 ASM_VSID_SCRAMBLE(r11, r9)
1275 rldic r9,r11,12,16 /* r9 = vsid << 12 */
1276
1277 /* Search the primary group for a free entry */
1278 1: ld r11,0(r10) /* Test valid bit of the current ste */
1279 andi. r11,r11,0x80
1280 beq 2f
1281 addi r10,r10,16
1282 andi. r11,r10,0x70
1283 bne 1b
1284
1285 /* Stick for only searching the primary group for now. */
1286 /* At least for now, we use a very simple random castout scheme */
1287 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1288 mftb r11
1289 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1290 ori r11,r11,0x10
1291
1292 /* r10 currently points to an ste one past the group of interest */
1293 /* make it point to the randomly selected entry */
1294 subi r10,r10,128
1295 or r10,r10,r11 /* r10 is the entry to invalidate */
1296
1297 isync /* mark the entry invalid */
1298 ld r11,0(r10)
1299 rldicl r11,r11,56,1 /* clear the valid bit */
1300 rotldi r11,r11,8
1301 std r11,0(r10)
1302 sync
1303
1304 clrrdi r11,r11,28 /* Get the esid part of the ste */
1305 slbie r11
1306
1307 2: std r9,8(r10) /* Store the vsid part of the ste */
1308 eieio
1309
1310 mfspr r11,SPRN_DAR /* Get the new esid */
1311 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1312 ori r11,r11,0x90 /* Turn on valid and kp */
1313 std r11,0(r10) /* Put new entry back into the stab */
1314
1315 sync
1316
1317 /* All done -- return from exception. */
1318 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1319 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1320
1321 andi. r10,r12,MSR_RI
1322 beq- unrecov_slb
1323
1324 mtcrf 0x80,r9 /* restore CR */
1325
1326 mfmsr r10
1327 clrrdi r10,r10,2
1328 mtmsrd r10,1
1329
1330 mtspr SPRN_SRR0,r11
1331 mtspr SPRN_SRR1,r12
1332 ld r9,PACA_EXSLB+EX_R9(r13)
1333 ld r10,PACA_EXSLB+EX_R10(r13)
1334 ld r11,PACA_EXSLB+EX_R11(r13)
1335 ld r12,PACA_EXSLB+EX_R12(r13)
1336 ld r13,PACA_EXSLB+EX_R13(r13)
1337 rfid
1338 b . /* prevent speculative execution */
1339
1340 /*
1341 * Space for CPU0's segment table.
1342 *
1343 * On iSeries, the hypervisor must fill in at least one entry before
1344 * we get control (with relocate on). The address is give to the hv
1345 * as a page number (see xLparMap in lpardata.c), so this must be at a
1346 * fixed address (the linker can't compute (u64)&initial_stab >>
1347 * PAGE_SHIFT).
1348 */
1349 . = STAB0_PHYS_ADDR /* 0x6000 */
1350 .globl initial_stab
1351 initial_stab:
1352 .space 4096
1353
1354 /*
1355 * Data area reserved for FWNMI option.
1356 * This address (0x7000) is fixed by the RPA.
1357 */
1358 .= 0x7000
1359 .globl fwnmi_data_area
1360 fwnmi_data_area:
1361
1362 /* iSeries does not use the FWNMI stuff, so it is safe to put
1363 * this here, even if we later allow kernels that will boot on
1364 * both pSeries and iSeries */
1365 #ifdef CONFIG_PPC_ISERIES
1366 . = LPARMAP_PHYS
1367 #include "lparmap.s"
1368 /*
1369 * This ".text" is here for old compilers that generate a trailing
1370 * .note section when compiling .c files to .s
1371 */
1372 .text
1373 #endif /* CONFIG_PPC_ISERIES */
1374
1375 . = 0x8000
1376
1377 /*
1378 * On pSeries, secondary processors spin in the following code.
1379 * At entry, r3 = this processor's number (physical cpu id)
1380 */
1381 _GLOBAL(pSeries_secondary_smp_init)
1382 mr r24,r3
1383
1384 /* turn on 64-bit mode */
1385 bl .enable_64b_mode
1386 isync
1387
1388 /* Copy some CPU settings from CPU 0 */
1389 bl .__restore_cpu_setup
1390
1391 /* Set up a paca value for this processor. Since we have the
1392 * physical cpu id in r24, we need to search the pacas to find
1393 * which logical id maps to our physical one.
1394 */
1395 LOADADDR(r13, paca) /* Get base vaddr of paca array */
1396 li r5,0 /* logical cpu id */
1397 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */
1398 cmpw r6,r24 /* Compare to our id */
1399 beq 2f
1400 addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */
1401 addi r5,r5,1
1402 cmpwi r5,NR_CPUS
1403 blt 1b
1404
1405 mr r3,r24 /* not found, copy phys to r3 */
1406 b .kexec_wait /* next kernel might do better */
1407
1408 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1409 /* From now on, r24 is expected to be logical cpuid */
1410 mr r24,r5
1411 3: HMT_LOW
1412 lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
1413 /* start. */
1414 sync
1415
1416 /* Create a temp kernel stack for use before relocation is on. */
1417 ld r1,PACAEMERGSP(r13)
1418 subi r1,r1,STACK_FRAME_OVERHEAD
1419
1420 cmpwi 0,r23,0
1421 #ifdef CONFIG_SMP
1422 bne .__secondary_start
1423 #endif
1424 b 3b /* Loop until told to go */
1425
1426 #ifdef CONFIG_PPC_ISERIES
1427 _STATIC(__start_initialization_iSeries)
1428 /* Clear out the BSS */
1429 LOADADDR(r11,__bss_stop)
1430 LOADADDR(r8,__bss_start)
1431 sub r11,r11,r8 /* bss size */
1432 addi r11,r11,7 /* round up to an even double word */
1433 rldicl. r11,r11,61,3 /* shift right by 3 */
1434 beq 4f
1435 addi r8,r8,-8
1436 li r0,0
1437 mtctr r11 /* zero this many doublewords */
1438 3: stdu r0,8(r8)
1439 bdnz 3b
1440 4:
1441 LOADADDR(r1,init_thread_union)
1442 addi r1,r1,THREAD_SIZE
1443 li r0,0
1444 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1445
1446 LOADADDR(r3,cpu_specs)
1447 LOADADDR(r4,cur_cpu_spec)
1448 li r5,0
1449 bl .identify_cpu
1450
1451 LOADADDR(r2,__toc_start)
1452 addi r2,r2,0x4000
1453 addi r2,r2,0x4000
1454
1455 bl .iSeries_early_setup
1456 bl .early_setup
1457
1458 /* relocation is on at this point */
1459
1460 b .start_here_common
1461 #endif /* CONFIG_PPC_ISERIES */
1462
1463 #ifdef CONFIG_PPC_MULTIPLATFORM
1464
1465 _STATIC(__mmu_off)
1466 mfmsr r3
1467 andi. r0,r3,MSR_IR|MSR_DR
1468 beqlr
1469 andc r3,r3,r0
1470 mtspr SPRN_SRR0,r4
1471 mtspr SPRN_SRR1,r3
1472 sync
1473 rfid
1474 b . /* prevent speculative execution */
1475
1476
1477 /*
1478 * Here is our main kernel entry point. We support currently 2 kind of entries
1479 * depending on the value of r5.
1480 *
1481 * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
1482 * in r3...r7
1483 *
1484 * r5 == NULL -> kexec style entry. r3 is a physical pointer to the
1485 * DT block, r4 is a physical pointer to the kernel itself
1486 *
1487 */
1488 _GLOBAL(__start_initialization_multiplatform)
1489 /*
1490 * Are we booted from a PROM Of-type client-interface ?
1491 */
1492 cmpldi cr0,r5,0
1493 bne .__boot_from_prom /* yes -> prom */
1494
1495 /* Save parameters */
1496 mr r31,r3
1497 mr r30,r4
1498
1499 /* Make sure we are running in 64 bits mode */
1500 bl .enable_64b_mode
1501
1502 /* Setup some critical 970 SPRs before switching MMU off */
1503 bl .__970_cpu_preinit
1504
1505 /* cpu # */
1506 li r24,0
1507
1508 /* Switch off MMU if not already */
1509 LOADADDR(r4, .__after_prom_start - KERNELBASE)
1510 add r4,r4,r30
1511 bl .__mmu_off
1512 b .__after_prom_start
1513
1514 _STATIC(__boot_from_prom)
1515 /* Save parameters */
1516 mr r31,r3
1517 mr r30,r4
1518 mr r29,r5
1519 mr r28,r6
1520 mr r27,r7
1521
1522 /* Make sure we are running in 64 bits mode */
1523 bl .enable_64b_mode
1524
1525 /* put a relocation offset into r3 */
1526 bl .reloc_offset
1527
1528 LOADADDR(r2,__toc_start)
1529 addi r2,r2,0x4000
1530 addi r2,r2,0x4000
1531
1532 /* Relocate the TOC from a virt addr to a real addr */
1533 add r2,r2,r3
1534
1535 /* Restore parameters */
1536 mr r3,r31
1537 mr r4,r30
1538 mr r5,r29
1539 mr r6,r28
1540 mr r7,r27
1541
1542 /* Do all of the interaction with OF client interface */
1543 bl .prom_init
1544 /* We never return */
1545 trap
1546
1547 /*
1548 * At this point, r3 contains the physical address we are running at,
1549 * returned by prom_init()
1550 */
1551 _STATIC(__after_prom_start)
1552
1553 /*
1554 * We need to run with __start at physical address 0.
1555 * This will leave some code in the first 256B of
1556 * real memory, which are reserved for software use.
1557 * The remainder of the first page is loaded with the fixed
1558 * interrupt vectors. The next two pages are filled with
1559 * unknown exception placeholders.
1560 *
1561 * Note: This process overwrites the OF exception vectors.
1562 * r26 == relocation offset
1563 * r27 == KERNELBASE
1564 */
1565 bl .reloc_offset
1566 mr r26,r3
1567 SET_REG_TO_CONST(r27,KERNELBASE)
1568
1569 li r3,0 /* target addr */
1570
1571 // XXX FIXME: Use phys returned by OF (r30)
1572 add r4,r27,r26 /* source addr */
1573 /* current address of _start */
1574 /* i.e. where we are running */
1575 /* the source addr */
1576
1577 LOADADDR(r5,copy_to_here) /* # bytes of memory to copy */
1578 sub r5,r5,r27
1579
1580 li r6,0x100 /* Start offset, the first 0x100 */
1581 /* bytes were copied earlier. */
1582
1583 bl .copy_and_flush /* copy the first n bytes */
1584 /* this includes the code being */
1585 /* executed here. */
1586
1587 LOADADDR(r0, 4f) /* Jump to the copy of this code */
1588 mtctr r0 /* that we just made/relocated */
1589 bctr
1590
1591 4: LOADADDR(r5,klimit)
1592 add r5,r5,r26
1593 ld r5,0(r5) /* get the value of klimit */
1594 sub r5,r5,r27
1595 bl .copy_and_flush /* copy the rest */
1596 b .start_here_multiplatform
1597
1598 #endif /* CONFIG_PPC_MULTIPLATFORM */
1599
1600 /*
1601 * Copy routine used to copy the kernel to start at physical address 0
1602 * and flush and invalidate the caches as needed.
1603 * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
1604 * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
1605 *
1606 * Note: this routine *only* clobbers r0, r6 and lr
1607 */
1608 _GLOBAL(copy_and_flush)
1609 addi r5,r5,-8
1610 addi r6,r6,-8
1611 4: li r0,16 /* Use the least common */
1612 /* denominator cache line */
1613 /* size. This results in */
1614 /* extra cache line flushes */
1615 /* but operation is correct. */
1616 /* Can't get cache line size */
1617 /* from NACA as it is being */
1618 /* moved too. */
1619
1620 mtctr r0 /* put # words/line in ctr */
1621 3: addi r6,r6,8 /* copy a cache line */
1622 ldx r0,r6,r4
1623 stdx r0,r6,r3
1624 bdnz 3b
1625 dcbst r6,r3 /* write it to memory */
1626 sync
1627 icbi r6,r3 /* flush the icache line */
1628 cmpld 0,r6,r5
1629 blt 4b
1630 sync
1631 addi r5,r5,8
1632 addi r6,r6,8
1633 blr
1634
1635 .align 8
1636 copy_to_here:
1637
1638 #ifdef CONFIG_SMP
1639 #ifdef CONFIG_PPC_PMAC
1640 /*
1641 * On PowerMac, secondary processors starts from the reset vector, which
1642 * is temporarily turned into a call to one of the functions below.
1643 */
1644 .section ".text";
1645 .align 2 ;
1646
1647 .globl __secondary_start_pmac_0
1648 __secondary_start_pmac_0:
1649 /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
1650 li r24,0
1651 b 1f
1652 li r24,1
1653 b 1f
1654 li r24,2
1655 b 1f
1656 li r24,3
1657 1:
1658
1659 _GLOBAL(pmac_secondary_start)
1660 /* turn on 64-bit mode */
1661 bl .enable_64b_mode
1662 isync
1663
1664 /* Copy some CPU settings from CPU 0 */
1665 bl .__restore_cpu_setup
1666
1667 /* pSeries do that early though I don't think we really need it */
1668 mfmsr r3
1669 ori r3,r3,MSR_RI
1670 mtmsrd r3 /* RI on */
1671
1672 /* Set up a paca value for this processor. */
1673 LOADADDR(r4, paca) /* Get base vaddr of paca array */
1674 mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */
1675 add r13,r13,r4 /* for this processor. */
1676 mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1677
1678 /* Create a temp kernel stack for use before relocation is on. */
1679 ld r1,PACAEMERGSP(r13)
1680 subi r1,r1,STACK_FRAME_OVERHEAD
1681
1682 b .__secondary_start
1683
1684 #endif /* CONFIG_PPC_PMAC */
1685
1686 /*
1687 * This function is called after the master CPU has released the
1688 * secondary processors. The execution environment is relocation off.
1689 * The paca for this processor has the following fields initialized at
1690 * this point:
1691 * 1. Processor number
1692 * 2. Segment table pointer (virtual address)
1693 * On entry the following are set:
1694 * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries
1695 * r24 = cpu# (in Linux terms)
1696 * r13 = paca virtual address
1697 * SPRG3 = paca virtual address
1698 */
1699 _GLOBAL(__secondary_start)
1700 /* Set thread priority to MEDIUM */
1701 HMT_MEDIUM
1702
1703 /* Load TOC */
1704 ld r2,PACATOC(r13)
1705
1706 /* Do early setup for that CPU (stab, slb, hash table pointer) */
1707 bl .early_setup_secondary
1708
1709 /* Initialize the kernel stack. Just a repeat for iSeries. */
1710 LOADADDR(r3,current_set)
1711 sldi r28,r24,3 /* get current_set[cpu#] */
1712 ldx r1,r3,r28
1713 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1714 std r1,PACAKSAVE(r13)
1715
1716 /* Clear backchain so we get nice backtraces */
1717 li r7,0
1718 mtlr r7
1719
1720 /* enable MMU and jump to start_secondary */
1721 LOADADDR(r3,.start_secondary_prolog)
1722 SET_REG_TO_CONST(r4, MSR_KERNEL)
1723 #ifdef DO_SOFT_DISABLE
1724 ori r4,r4,MSR_EE
1725 #endif
1726 mtspr SPRN_SRR0,r3
1727 mtspr SPRN_SRR1,r4
1728 rfid
1729 b . /* prevent speculative execution */
1730
1731 /*
1732 * Running with relocation on at this point. All we want to do is
1733 * zero the stack back-chain pointer before going into C code.
1734 */
1735 _GLOBAL(start_secondary_prolog)
1736 li r3,0
1737 std r3,0(r1) /* Zero the stack frame pointer */
1738 bl .start_secondary
1739 b .
1740 #endif
1741
1742 /*
1743 * This subroutine clobbers r11 and r12
1744 */
1745 _GLOBAL(enable_64b_mode)
1746 mfmsr r11 /* grab the current MSR */
1747 li r12,1
1748 rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1749 or r11,r11,r12
1750 li r12,1
1751 rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1752 or r11,r11,r12
1753 mtmsrd r11
1754 isync
1755 blr
1756
1757 #ifdef CONFIG_PPC_MULTIPLATFORM
1758 /*
1759 * This is where the main kernel code starts.
1760 */
1761 _STATIC(start_here_multiplatform)
1762 /* get a new offset, now that the kernel has moved. */
1763 bl .reloc_offset
1764 mr r26,r3
1765
1766 /* Clear out the BSS. It may have been done in prom_init,
1767 * already but that's irrelevant since prom_init will soon
1768 * be detached from the kernel completely. Besides, we need
1769 * to clear it now for kexec-style entry.
1770 */
1771 LOADADDR(r11,__bss_stop)
1772 LOADADDR(r8,__bss_start)
1773 sub r11,r11,r8 /* bss size */
1774 addi r11,r11,7 /* round up to an even double word */
1775 rldicl. r11,r11,61,3 /* shift right by 3 */
1776 beq 4f
1777 addi r8,r8,-8
1778 li r0,0
1779 mtctr r11 /* zero this many doublewords */
1780 3: stdu r0,8(r8)
1781 bdnz 3b
1782 4:
1783
1784 mfmsr r6
1785 ori r6,r6,MSR_RI
1786 mtmsrd r6 /* RI on */
1787
1788 #ifdef CONFIG_HMT
1789 /* Start up the second thread on cpu 0 */
1790 mfspr r3,SPRN_PVR
1791 srwi r3,r3,16
1792 cmpwi r3,0x34 /* Pulsar */
1793 beq 90f
1794 cmpwi r3,0x36 /* Icestar */
1795 beq 90f
1796 cmpwi r3,0x37 /* SStar */
1797 beq 90f
1798 b 91f /* HMT not supported */
1799 90: li r3,0
1800 bl .hmt_start_secondary
1801 91:
1802 #endif
1803
1804 /* The following gets the stack and TOC set up with the regs */
1805 /* pointing to the real addr of the kernel stack. This is */
1806 /* all done to support the C function call below which sets */
1807 /* up the htab. This is done because we have relocated the */
1808 /* kernel but are still running in real mode. */
1809
1810 LOADADDR(r3,init_thread_union)
1811 add r3,r3,r26
1812
1813 /* set up a stack pointer (physical address) */
1814 addi r1,r3,THREAD_SIZE
1815 li r0,0
1816 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1817
1818 /* set up the TOC (physical address) */
1819 LOADADDR(r2,__toc_start)
1820 addi r2,r2,0x4000
1821 addi r2,r2,0x4000
1822 add r2,r2,r26
1823
1824 LOADADDR(r3,cpu_specs)
1825 add r3,r3,r26
1826 LOADADDR(r4,cur_cpu_spec)
1827 add r4,r4,r26
1828 mr r5,r26
1829 bl .identify_cpu
1830
1831 /* Save some low level config HIDs of CPU0 to be copied to
1832 * other CPUs later on, or used for suspend/resume
1833 */
1834 bl .__save_cpu_setup
1835 sync
1836
1837 /* Setup a valid physical PACA pointer in SPRG3 for early_setup
1838 * note that boot_cpuid can always be 0 nowadays since there is
1839 * nowhere it can be initialized differently before we reach this
1840 * code
1841 */
1842 LOADADDR(r27, boot_cpuid)
1843 add r27,r27,r26
1844 lwz r27,0(r27)
1845
1846 LOADADDR(r24, paca) /* Get base vaddr of paca array */
1847 mulli r13,r27,PACA_SIZE /* Calculate vaddr of right paca */
1848 add r13,r13,r24 /* for this processor. */
1849 add r13,r13,r26 /* convert to physical addr */
1850 mtspr SPRN_SPRG3,r13 /* PPPBBB: Temp... -Peter */
1851
1852 /* Do very early kernel initializations, including initial hash table,
1853 * stab and slb setup before we turn on relocation. */
1854
1855 /* Restore parameters passed from prom_init/kexec */
1856 mr r3,r31
1857 bl .early_setup
1858
1859 LOADADDR(r3,.start_here_common)
1860 SET_REG_TO_CONST(r4, MSR_KERNEL)
1861 mtspr SPRN_SRR0,r3
1862 mtspr SPRN_SRR1,r4
1863 rfid
1864 b . /* prevent speculative execution */
1865 #endif /* CONFIG_PPC_MULTIPLATFORM */
1866
1867 /* This is where all platforms converge execution */
1868 _STATIC(start_here_common)
1869 /* relocation is on at this point */
1870
1871 /* The following code sets up the SP and TOC now that we are */
1872 /* running with translation enabled. */
1873
1874 LOADADDR(r3,init_thread_union)
1875
1876 /* set up the stack */
1877 addi r1,r3,THREAD_SIZE
1878 li r0,0
1879 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1880
1881 /* Apply the CPUs-specific fixups (nop out sections not relevant
1882 * to this CPU
1883 */
1884 li r3,0
1885 bl .do_cpu_ftr_fixups
1886
1887 LOADADDR(r26, boot_cpuid)
1888 lwz r26,0(r26)
1889
1890 LOADADDR(r24, paca) /* Get base vaddr of paca array */
1891 mulli r13,r26,PACA_SIZE /* Calculate vaddr of right paca */
1892 add r13,r13,r24 /* for this processor. */
1893 mtspr SPRN_SPRG3,r13
1894
1895 /* ptr to current */
1896 LOADADDR(r4,init_task)
1897 std r4,PACACURRENT(r13)
1898
1899 /* Load the TOC */
1900 ld r2,PACATOC(r13)
1901 std r1,PACAKSAVE(r13)
1902
1903 bl .setup_system
1904
1905 /* Load up the kernel context */
1906 5:
1907 #ifdef DO_SOFT_DISABLE
1908 li r5,0
1909 stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
1910 mfmsr r5
1911 ori r5,r5,MSR_EE /* Hard Enabled */
1912 mtmsrd r5
1913 #endif
1914
1915 bl .start_kernel
1916
1917 _GLOBAL(hmt_init)
1918 #ifdef CONFIG_HMT
1919 LOADADDR(r5, hmt_thread_data)
1920 mfspr r7,SPRN_PVR
1921 srwi r7,r7,16
1922 cmpwi r7,0x34 /* Pulsar */
1923 beq 90f
1924 cmpwi r7,0x36 /* Icestar */
1925 beq 91f
1926 cmpwi r7,0x37 /* SStar */
1927 beq 91f
1928 b 101f
1929 90: mfspr r6,SPRN_PIR
1930 andi. r6,r6,0x1f
1931 b 92f
1932 91: mfspr r6,SPRN_PIR
1933 andi. r6,r6,0x3ff
1934 92: sldi r4,r24,3
1935 stwx r6,r5,r4
1936 bl .hmt_start_secondary
1937 b 101f
1938
1939 __hmt_secondary_hold:
1940 LOADADDR(r5, hmt_thread_data)
1941 clrldi r5,r5,4
1942 li r7,0
1943 mfspr r6,SPRN_PIR
1944 mfspr r8,SPRN_PVR
1945 srwi r8,r8,16
1946 cmpwi r8,0x34
1947 bne 93f
1948 andi. r6,r6,0x1f
1949 b 103f
1950 93: andi. r6,r6,0x3f
1951
1952 103: lwzx r8,r5,r7
1953 cmpw r8,r6
1954 beq 104f
1955 addi r7,r7,8
1956 b 103b
1957
1958 104: addi r7,r7,4
1959 lwzx r9,r5,r7
1960 mr r24,r9
1961 101:
1962 #endif
1963 mr r3,r24
1964 b .pSeries_secondary_smp_init
1965
1966 #ifdef CONFIG_HMT
1967 _GLOBAL(hmt_start_secondary)
1968 LOADADDR(r4,__hmt_secondary_hold)
1969 clrldi r4,r4,4
1970 mtspr SPRN_NIADORM, r4
1971 mfspr r4, SPRN_MSRDORM
1972 li r5, -65
1973 and r4, r4, r5
1974 mtspr SPRN_MSRDORM, r4
1975 lis r4,0xffef
1976 ori r4,r4,0x7403
1977 mtspr SPRN_TSC, r4
1978 li r4,0x1f4
1979 mtspr SPRN_TST, r4
1980 mfspr r4, SPRN_HID0
1981 ori r4, r4, 0x1
1982 mtspr SPRN_HID0, r4
1983 mfspr r4, SPRN_CTRLF
1984 oris r4, r4, 0x40
1985 mtspr SPRN_CTRLT, r4
1986 blr
1987 #endif
1988
1989 /*
1990 * We put a few things here that have to be page-aligned.
1991 * This stuff goes at the beginning of the bss, which is page-aligned.
1992 */
1993 .section ".bss"
1994
1995 .align PAGE_SHIFT
1996
1997 .globl empty_zero_page
1998 empty_zero_page:
1999 .space PAGE_SIZE
2000
2001 .globl swapper_pg_dir
2002 swapper_pg_dir:
2003 .space PAGE_SIZE
2004
2005 /*
2006 * This space gets a copy of optional info passed to us by the bootstrap
2007 * Used to pass parameters into the kernel like root=/dev/sda1, etc.
2008 */
2009 .globl cmd_line
2010 cmd_line:
2011 .space COMMAND_LINE_SIZE
Linux kernel - Deliverables
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