2 * arch/ppc64/kernel/head.S
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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.
14 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
15 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
17 * This file contains the low-level support and setup for the
18 * PowerPC-64 platform, including trap and interrupt dispatch.
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.
26 #include <linux/config.h>
27 #include <linux/threads.h>
31 #include <asm/systemcfg.h>
32 #include <asm/ppc_asm.h>
33 #include <asm/asm-offsets.h>
35 #include <asm/cputable.h>
36 #include <asm/setup.h>
37 #include <asm/hvcall.h>
38 #include <asm/iseries/lpar_map.h>
39 #include <asm/thread_info.h>
41 #ifdef CONFIG_PPC_ISERIES
42 #define DO_SOFT_DISABLE
46 * We layout physical memory as follows:
47 * 0x0000 - 0x00ff : Secondary processor spin code
48 * 0x0100 - 0x2fff : pSeries Interrupt prologs
49 * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs
50 * 0x6000 - 0x6fff : Initial (CPU0) segment table
51 * 0x7000 - 0x7fff : FWNMI data area
52 * 0x8000 - : Early init and support code
60 * SPRG0 reserved for hypervisor
61 * SPRG1 temp - used to save gpr
62 * SPRG2 temp - used to save gpr
63 * SPRG3 virt addr of paca
67 * Entering into this code we make the following assumptions:
69 * 1. The MMU is off & open firmware is running in real mode.
70 * 2. The kernel is entered at __start
73 * 1. The MMU is on (as it always is for iSeries)
74 * 2. The kernel is entered at system_reset_iSeries
80 #ifdef CONFIG_PPC_MULTIPLATFORM
82 /* NOP this out unconditionally */
84 b .__start_initialization_multiplatform
86 #endif /* CONFIG_PPC_MULTIPLATFORM */
88 /* Catch branch to 0 in real mode */
91 #ifdef CONFIG_PPC_ISERIES
93 * At offset 0x20, there is a pointer to iSeries LPAR data.
94 * This is required by the hypervisor
97 .llong hvReleaseData-KERNELBASE
100 * At offset 0x28 and 0x30 are offsets to the mschunks_map
101 * array (used by the iSeries LPAR debugger to do translation
102 * between physical addresses and absolute addresses) and
103 * to the pidhash table (also used by the debugger)
105 .llong mschunks_map-KERNELBASE
106 .llong 0 /* pidhash-KERNELBASE SFRXXX */
108 /* Offset 0x38 - Pointer to start of embedded System.map */
109 .globl embedded_sysmap_start
110 embedded_sysmap_start:
112 /* Offset 0x40 - Pointer to end of embedded System.map */
113 .globl embedded_sysmap_end
117 #endif /* CONFIG_PPC_ISERIES */
119 /* Secondary processors spin on this value until it goes to 1. */
120 .globl __secondary_hold_spinloop
121 __secondary_hold_spinloop:
124 /* Secondary processors write this value with their cpu # */
125 /* after they enter the spin loop immediately below. */
126 .globl __secondary_hold_acknowledge
127 __secondary_hold_acknowledge:
132 * The following code is used on pSeries to hold secondary processors
133 * in a spin loop after they have been freed from OpenFirmware, but
134 * before the bulk of the kernel has been relocated. This code
135 * is relocated to physical address 0x60 before prom_init is run.
136 * All of it must fit below the first exception vector at 0x100.
138 _GLOBAL(__secondary_hold)
141 mtmsrd r24 /* RI on */
143 /* Grab our linux cpu number */
146 /* Tell the master cpu we're here */
147 /* Relocation is off & we are located at an address less */
148 /* than 0x100, so only need to grab low order offset. */
149 std r24,__secondary_hold_acknowledge@l(0)
152 /* All secondary cpus wait here until told to start. */
153 100: ld r4,__secondary_hold_spinloop@l(0)
162 b .pSeries_secondary_smp_init
168 /* This value is used to mark exception frames on the stack. */
171 .tc ID_72656773_68657265[TC],0x7265677368657265
175 * The following macros define the code that appears as
176 * the prologue to each of the exception handlers. They
177 * are split into two parts to allow a single kernel binary
178 * to be used for pSeries and iSeries.
179 * LOL. One day... - paulus
183 * We make as much of the exception code common between native
184 * exception handlers (including pSeries LPAR) and iSeries LPAR
185 * implementations as possible.
189 * This is the start of the interrupt handlers for pSeries
190 * This code runs with relocation off.
204 #define EXCEPTION_PROLOG_PSERIES(area, label) \
205 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
206 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
207 std r10,area+EX_R10(r13); \
208 std r11,area+EX_R11(r13); \
209 std r12,area+EX_R12(r13); \
210 mfspr r9,SPRN_SPRG1; \
211 std r9,area+EX_R13(r13); \
213 clrrdi r12,r13,32; /* get high part of &label */ \
215 mfspr r11,SPRN_SRR0; /* save SRR0 */ \
216 ori r12,r12,(label)@l; /* virt addr of handler */ \
217 ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
218 mtspr SPRN_SRR0,r12; \
219 mfspr r12,SPRN_SRR1; /* and SRR1 */ \
220 mtspr SPRN_SRR1,r10; \
222 b . /* prevent speculative execution */
225 * This is the start of the interrupt handlers for iSeries
226 * This code runs with relocation on.
228 #define EXCEPTION_PROLOG_ISERIES_1(area) \
229 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
230 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
231 std r10,area+EX_R10(r13); \
232 std r11,area+EX_R11(r13); \
233 std r12,area+EX_R12(r13); \
234 mfspr r9,SPRN_SPRG1; \
235 std r9,area+EX_R13(r13); \
238 #define EXCEPTION_PROLOG_ISERIES_2 \
240 ld r11,PACALPPACA+LPPACASRR0(r13); \
241 ld r12,PACALPPACA+LPPACASRR1(r13); \
242 ori r10,r10,MSR_RI; \
246 * The common exception prolog is used for all except a few exceptions
247 * such as a segment miss on a kernel address. We have to be prepared
248 * to take another exception from the point where we first touch the
249 * kernel stack onwards.
251 * On entry r13 points to the paca, r9-r13 are saved in the paca,
252 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
253 * SRR1, and relocation is on.
255 #define EXCEPTION_PROLOG_COMMON(n, area) \
256 andi. r10,r12,MSR_PR; /* See if coming from user */ \
257 mr r10,r1; /* Save r1 */ \
258 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
260 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
261 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
262 bge- cr1,bad_stack; /* abort if it is */ \
263 std r9,_CCR(r1); /* save CR in stackframe */ \
264 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
265 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
266 std r10,0(r1); /* make stack chain pointer */ \
267 std r0,GPR0(r1); /* save r0 in stackframe */ \
268 std r10,GPR1(r1); /* save r1 in stackframe */ \
269 std r2,GPR2(r1); /* save r2 in stackframe */ \
270 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
271 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
272 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
273 ld r10,area+EX_R10(r13); \
276 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
277 ld r10,area+EX_R12(r13); \
278 ld r11,area+EX_R13(r13); \
282 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
283 mflr r9; /* save LR in stackframe */ \
285 mfctr r10; /* save CTR in stackframe */ \
287 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
290 std r9,_TRAP(r1); /* set trap number */ \
292 ld r11,exception_marker@toc(r2); \
293 std r10,RESULT(r1); /* clear regs->result */ \
294 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
299 #define STD_EXCEPTION_PSERIES(n, label) \
301 .globl label##_pSeries; \
304 mtspr SPRN_SPRG1,r13; /* save r13 */ \
306 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
308 #define STD_EXCEPTION_ISERIES(n, label, area) \
309 .globl label##_iSeries; \
312 mtspr SPRN_SPRG1,r13; /* save r13 */ \
314 EXCEPTION_PROLOG_ISERIES_1(area); \
315 EXCEPTION_PROLOG_ISERIES_2; \
318 #define MASKABLE_EXCEPTION_ISERIES(n, label) \
319 .globl label##_iSeries; \
322 mtspr SPRN_SPRG1,r13; /* save r13 */ \
324 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
325 lbz r10,PACAPROCENABLED(r13); \
327 beq- label##_iSeries_masked; \
328 EXCEPTION_PROLOG_ISERIES_2; \
331 #ifdef DO_SOFT_DISABLE
332 #define DISABLE_INTS \
333 lbz r10,PACAPROCENABLED(r13); \
337 stb r11,PACAPROCENABLED(r13); \
338 ori r10,r10,MSR_EE; \
341 #define ENABLE_INTS \
342 lbz r10,PACAPROCENABLED(r13); \
345 ori r11,r11,MSR_EE; \
348 #else /* hard enable/disable interrupts */
351 #define ENABLE_INTS \
354 rlwimi r11,r12,0,MSR_EE; \
359 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
361 .globl label##_common; \
363 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
366 addi r3,r1,STACK_FRAME_OVERHEAD; \
370 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
372 .globl label##_common; \
374 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
376 addi r3,r1,STACK_FRAME_OVERHEAD; \
378 b .ret_from_except_lite
381 * Start of pSeries system interrupt routines
384 .globl __start_interrupts
387 STD_EXCEPTION_PSERIES(0x100, system_reset)
390 _machine_check_pSeries:
392 mtspr SPRN_SPRG1,r13 /* save r13 */
394 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
397 .globl data_access_pSeries
406 rlwimi r13,r12,16,0x20
409 beq .do_stab_bolted_pSeries
412 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
413 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
416 .globl data_access_slb_pSeries
417 data_access_slb_pSeries:
421 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
422 std r3,PACA_EXSLB+EX_R3(r13)
424 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
427 /* Keep that around for when we re-implement dynamic VSIDs */
429 bge slb_miss_user_pseries
430 #endif /* __DISABLED__ */
431 std r10,PACA_EXSLB+EX_R10(r13)
432 std r11,PACA_EXSLB+EX_R11(r13)
433 std r12,PACA_EXSLB+EX_R12(r13)
435 std r10,PACA_EXSLB+EX_R13(r13)
436 mfspr r12,SPRN_SRR1 /* and SRR1 */
437 b .slb_miss_realmode /* Rel. branch works in real mode */
439 STD_EXCEPTION_PSERIES(0x400, instruction_access)
442 .globl instruction_access_slb_pSeries
443 instruction_access_slb_pSeries:
447 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
448 std r3,PACA_EXSLB+EX_R3(r13)
449 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
450 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
453 /* Keep that around for when we re-implement dynamic VSIDs */
455 bge slb_miss_user_pseries
456 #endif /* __DISABLED__ */
457 std r10,PACA_EXSLB+EX_R10(r13)
458 std r11,PACA_EXSLB+EX_R11(r13)
459 std r12,PACA_EXSLB+EX_R12(r13)
461 std r10,PACA_EXSLB+EX_R13(r13)
462 mfspr r12,SPRN_SRR1 /* and SRR1 */
463 b .slb_miss_realmode /* Rel. branch works in real mode */
465 STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
466 STD_EXCEPTION_PSERIES(0x600, alignment)
467 STD_EXCEPTION_PSERIES(0x700, program_check)
468 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
469 STD_EXCEPTION_PSERIES(0x900, decrementer)
470 STD_EXCEPTION_PSERIES(0xa00, trap_0a)
471 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
474 .globl system_call_pSeries
483 oris r12,r12,system_call_common@h
484 ori r12,r12,system_call_common@l
486 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
490 b . /* prevent speculative execution */
492 STD_EXCEPTION_PSERIES(0xd00, single_step)
493 STD_EXCEPTION_PSERIES(0xe00, trap_0e)
495 /* We need to deal with the Altivec unavailable exception
496 * here which is at 0xf20, thus in the middle of the
497 * prolog code of the PerformanceMonitor one. A little
498 * trickery is thus necessary
501 b performance_monitor_pSeries
503 STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
505 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
506 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
510 /*** pSeries interrupt support ***/
512 /* moved from 0xf00 */
513 STD_EXCEPTION_PSERIES(., performance_monitor)
516 _GLOBAL(do_stab_bolted_pSeries)
519 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
522 * We have some room here we use that to put
523 * the peries slb miss user trampoline code so it's reasonably
524 * away from slb_miss_user_common to avoid problems with rfid
526 * This is used for when the SLB miss handler has to go virtual,
527 * which doesn't happen for now anymore but will once we re-implement
528 * dynamic VSIDs for shared page tables
531 slb_miss_user_pseries:
532 std r10,PACA_EXGEN+EX_R10(r13)
533 std r11,PACA_EXGEN+EX_R11(r13)
534 std r12,PACA_EXGEN+EX_R12(r13)
536 ld r11,PACA_EXSLB+EX_R9(r13)
537 ld r12,PACA_EXSLB+EX_R3(r13)
538 std r10,PACA_EXGEN+EX_R13(r13)
539 std r11,PACA_EXGEN+EX_R9(r13)
540 std r12,PACA_EXGEN+EX_R3(r13)
543 mfspr r11,SRR0 /* save SRR0 */
544 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
545 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
547 mfspr r12,SRR1 /* and SRR1 */
550 b . /* prevent spec. execution */
551 #endif /* __DISABLED__ */
554 * Vectors for the FWNMI option. Share common code.
556 .globl system_reset_fwnmi
559 mtspr SPRN_SPRG1,r13 /* save r13 */
561 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
563 .globl machine_check_fwnmi
566 mtspr SPRN_SPRG1,r13 /* save r13 */
568 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
570 #ifdef CONFIG_PPC_ISERIES
571 /*** ISeries-LPAR interrupt handlers ***/
573 STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
575 .globl data_access_iSeries
583 rlwimi r13,r12,16,0x20
586 beq .do_stab_bolted_iSeries
589 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
590 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
591 EXCEPTION_PROLOG_ISERIES_2
594 .do_stab_bolted_iSeries:
597 EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
598 EXCEPTION_PROLOG_ISERIES_2
601 .globl data_access_slb_iSeries
602 data_access_slb_iSeries:
603 mtspr SPRN_SPRG1,r13 /* save r13 */
604 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
605 std r3,PACA_EXSLB+EX_R3(r13)
607 std r9,PACA_EXSLB+EX_R9(r13)
611 bge slb_miss_user_iseries
613 std r10,PACA_EXSLB+EX_R10(r13)
614 std r11,PACA_EXSLB+EX_R11(r13)
615 std r12,PACA_EXSLB+EX_R12(r13)
617 std r10,PACA_EXSLB+EX_R13(r13)
618 ld r12,PACALPPACA+LPPACASRR1(r13);
621 STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
623 .globl instruction_access_slb_iSeries
624 instruction_access_slb_iSeries:
625 mtspr SPRN_SPRG1,r13 /* save r13 */
626 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
627 std r3,PACA_EXSLB+EX_R3(r13)
628 ld r3,PACALPPACA+LPPACASRR0(r13) /* get SRR0 value */
629 std r9,PACA_EXSLB+EX_R9(r13)
633 bge .slb_miss_user_iseries
635 std r10,PACA_EXSLB+EX_R10(r13)
636 std r11,PACA_EXSLB+EX_R11(r13)
637 std r12,PACA_EXSLB+EX_R12(r13)
639 std r10,PACA_EXSLB+EX_R13(r13)
640 ld r12,PACALPPACA+LPPACASRR1(r13);
644 slb_miss_user_iseries:
645 std r10,PACA_EXGEN+EX_R10(r13)
646 std r11,PACA_EXGEN+EX_R11(r13)
647 std r12,PACA_EXGEN+EX_R12(r13)
649 ld r11,PACA_EXSLB+EX_R9(r13)
650 ld r12,PACA_EXSLB+EX_R3(r13)
651 std r10,PACA_EXGEN+EX_R13(r13)
652 std r11,PACA_EXGEN+EX_R9(r13)
653 std r12,PACA_EXGEN+EX_R3(r13)
654 EXCEPTION_PROLOG_ISERIES_2
655 b slb_miss_user_common
658 MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
659 STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
660 STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
661 STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
662 MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
663 STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
664 STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
666 .globl system_call_iSeries
670 EXCEPTION_PROLOG_ISERIES_2
673 STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
674 STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
675 STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
677 .globl system_reset_iSeries
678 system_reset_iSeries:
679 mfspr r13,SPRN_SPRG3 /* Get paca address */
682 mtmsrd r24 /* RI on */
683 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
684 cmpwi 0,r24,0 /* Are we processor 0? */
685 beq .__start_initialization_iSeries /* Start up the first processor */
687 li r5,CTRL_RUNLATCH /* Turn off the run light */
694 lbz r23,PACAPROCSTART(r13) /* Test if this processor
697 LOADADDR(r3,current_set)
698 sldi r28,r24,3 /* get current_set[cpu#] */
700 addi r1,r3,THREAD_SIZE
701 subi r1,r1,STACK_FRAME_OVERHEAD
704 beq iSeries_secondary_smp_loop /* Loop until told to go */
705 bne .__secondary_start /* Loop until told to go */
706 iSeries_secondary_smp_loop:
707 /* Let the Hypervisor know we are alive */
708 /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
710 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
711 #else /* CONFIG_SMP */
712 /* Yield the processor. This is required for non-SMP kernels
713 which are running on multi-threaded machines. */
715 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
716 addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
717 li r4,0 /* "yield timed" */
718 li r5,-1 /* "yield forever" */
719 #endif /* CONFIG_SMP */
720 li r0,-1 /* r0=-1 indicates a Hypervisor call */
721 sc /* Invoke the hypervisor via a system call */
722 mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
723 b 1b /* If SMP not configured, secondaries
726 .globl decrementer_iSeries_masked
727 decrementer_iSeries_masked:
729 stb r11,PACALPPACA+LPPACADECRINT(r13)
730 lwz r12,PACADEFAULTDECR(r13)
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)
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)
747 b . /* prevent speculative execution */
748 #endif /* CONFIG_PPC_ISERIES */
750 /*** Common interrupt handlers ***/
752 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
755 * Machine check is different because we use a different
756 * save area: PACA_EXMC instead of PACA_EXGEN.
759 .globl machine_check_common
760 machine_check_common:
761 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
764 addi r3,r1,STACK_FRAME_OVERHEAD
765 bl .machine_check_exception
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)
778 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
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.
790 ld r1,PACAEMERGSP(r13)
791 subi r1,r1,64+INT_FRAME_SIZE
812 addi r11,r1,INT_FRAME_SIZE
817 1: addi r3,r1,STACK_FRAME_OVERHEAD
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.
829 .globl fast_exception_return
830 fast_exception_return:
833 andi. r3,r12,MSR_RI /* check if RI is set */
847 clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
855 b . /* prevent speculative execution */
859 1: addi r3,r1,STACK_FRAME_OVERHEAD
860 bl .unrecoverable_exception
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.
869 .globl data_access_common
871 RUNLATCH_ON(r10) /* It wont fit in the 0x300 handler */
873 std r10,PACA_EXGEN+EX_DAR(r13)
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)
880 b .do_hash_page /* Try to handle as hpte fault */
883 .globl instruction_access_common
884 instruction_access_common:
885 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
889 b .do_hash_page /* Try to handle as hpte fault */
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
897 .globl slb_miss_user_common
898 slb_miss_user_common:
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
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)
913 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
914 beq- unrecov_user_slb
922 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
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)
937 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
938 ld r4,PACA_EXGEN+EX_DAR(r13)
945 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
948 1: addi r3,r1,STACK_FRAME_OVERHEAD
949 bl .unrecoverable_exception
952 #endif /* __DISABLED__ */
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.
963 _GLOBAL(slb_miss_realmode)
966 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
967 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
969 bl .slb_allocate_realmode
971 /* All done -- return from exception. */
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 */
982 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
988 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
991 #ifdef CONFIG_PPC_ISERIES
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)
1001 b . /* prevent speculative execution */
1004 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1007 1: addi r3,r1,STACK_FRAME_OVERHEAD
1008 bl .unrecoverable_exception
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:
1018 addi r3,r1,STACK_FRAME_OVERHEAD
1020 b .ret_from_except_lite
1023 .globl alignment_common
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)
1035 addi r3,r1,STACK_FRAME_OVERHEAD
1037 bl .alignment_exception
1041 .globl program_check_common
1042 program_check_common:
1043 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1045 addi r3,r1,STACK_FRAME_OVERHEAD
1047 bl .program_check_exception
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 */
1056 addi r3,r1,STACK_FRAME_OVERHEAD
1058 bl .kernel_fp_unavailable_exception
1062 .globl altivec_unavailable_common
1063 altivec_unavailable_common:
1064 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1065 #ifdef CONFIG_ALTIVEC
1067 bne .load_up_altivec /* if from user, just load it up */
1068 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1071 addi r3,r1,STACK_FRAME_OVERHEAD
1073 bl .altivec_unavailable_exception
1076 #ifdef CONFIG_ALTIVEC
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'
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 */
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...
1101 ld r3,last_task_used_altivec@got(r2)
1105 /* Save VMX state to last_task_used_altivec's THREAD struct */
1111 /* Disable VMX for last_task_used_altivec */
1113 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1116 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
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
1124 mfspr r4,SPRN_VRSAVE
1128 mtspr SPRN_VRSAVE,r4
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
1137 stw r4,THREAD_USED_VR(r5)
1142 /* Update last_task_used_math to 'current' */
1143 subi r4,r5,THREAD /* Back to 'current' */
1145 #endif /* CONFIG_SMP */
1146 /* restore registers and return */
1147 b fast_exception_return
1148 #endif /* CONFIG_ALTIVEC */
1154 _GLOBAL(do_hash_page)
1158 andis. r0,r4,0xa450 /* weird error? */
1159 bne- .handle_page_fault /* if not, try to insert a HPTE */
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)
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.
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 */
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.
1185 * r3 contains the faulting address
1186 * r4 contains the required access permissions
1187 * r5 contains the trap number
1189 * at return r3 = 0 for success
1191 bl .hash_page /* build HPTE if possible */
1192 cmpdi r3,0 /* see if hash_page succeeded */
1194 #ifdef DO_SOFT_DISABLE
1196 * If we had interrupts soft-enabled at the point where the
1197 * DSI/ISI occurred, and an interrupt came in during hash_page,
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.
1203 beq .ret_from_except_lite
1204 /* For a hash failure, we don't bother re-enabling interrupts */
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.
1213 bl .local_irq_restore
1216 beq fast_exception_return /* Return from exception on success */
1217 ble- 12f /* Failure return from hash_page */
1222 /* Here we have a page fault that hash_page can't handle. */
1223 _GLOBAL(handle_page_fault)
1227 addi r3,r1,STACK_FRAME_OVERHEAD
1230 beq+ .ret_from_except_lite
1233 addi r3,r1,STACK_FRAME_OVERHEAD
1238 /* We have a page fault that hash_page could handle but HV refused
1242 addi r3,r1,STACK_FRAME_OVERHEAD
1247 /* here we have a segment miss */
1248 _GLOBAL(do_ste_alloc)
1249 bl .ste_allocate /* try to insert stab entry */
1251 beq+ fast_exception_return
1252 b .handle_page_fault
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.
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 */
1266 /* Hash to the primary group */
1267 ld r10,PACASTABVIRT(r13)
1270 rldimi r10,r11,7,52 /* r10 = first ste of the group */
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 */
1277 /* Search the primary group for a free entry */
1278 1: ld r11,0(r10) /* Test valid bit of the current ste */
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 */
1289 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1292 /* r10 currently points to an ste one past the group of interest */
1293 /* make it point to the randomly selected entry */
1295 or r10,r10,r11 /* r10 is the entry to invalidate */
1297 isync /* mark the entry invalid */
1299 rldicl r11,r11,56,1 /* clear the valid bit */
1304 clrrdi r11,r11,28 /* Get the esid part of the ste */
1307 2: std r9,8(r10) /* Store the vsid part of the ste */
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 */
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 */
1321 andi. r10,r12,MSR_RI
1324 mtcrf 0x80,r9 /* restore CR */
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)
1338 b . /* prevent speculative execution */
1341 * Space for CPU0's segment table.
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 >>
1349 . = STAB0_PHYS_ADDR /* 0x6000 */
1355 * Data area reserved for FWNMI option.
1356 * This address (0x7000) is fixed by the RPA.
1359 .globl fwnmi_data_area
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
1367 #include "lparmap.s"
1369 * This ".text" is here for old compilers that generate a trailing
1370 * .note section when compiling .c files to .s
1373 #endif /* CONFIG_PPC_ISERIES */
1378 * On pSeries, secondary processors spin in the following code.
1379 * At entry, r3 = this processor's number (physical cpu id)
1381 _GLOBAL(pSeries_secondary_smp_init)
1384 /* turn on 64-bit mode */
1388 /* Copy some CPU settings from CPU 0 */
1389 bl .__restore_cpu_setup
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.
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 */
1400 addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */
1405 mr r3,r24 /* not found, copy phys to r3 */
1406 b .kexec_wait /* next kernel might do better */
1408 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1409 /* From now on, r24 is expected to be logical cpuid */
1412 lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
1416 /* Create a temp kernel stack for use before relocation is on. */
1417 ld r1,PACAEMERGSP(r13)
1418 subi r1,r1,STACK_FRAME_OVERHEAD
1422 bne .__secondary_start
1424 b 3b /* Loop until told to go */
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 */
1437 mtctr r11 /* zero this many doublewords */
1441 LOADADDR(r1,init_thread_union)
1442 addi r1,r1,THREAD_SIZE
1444 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1446 LOADADDR(r3,cpu_specs)
1447 LOADADDR(r4,cur_cpu_spec)
1451 LOADADDR(r2,__toc_start)
1455 bl .iSeries_early_setup
1458 /* relocation is on at this point */
1460 b .start_here_common
1461 #endif /* CONFIG_PPC_ISERIES */
1463 #ifdef CONFIG_PPC_MULTIPLATFORM
1467 andi. r0,r3,MSR_IR|MSR_DR
1474 b . /* prevent speculative execution */
1478 * Here is our main kernel entry point. We support currently 2 kind of entries
1479 * depending on the value of r5.
1481 * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
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
1488 _GLOBAL(__start_initialization_multiplatform)
1490 * Are we booted from a PROM Of-type client-interface ?
1493 bne .__boot_from_prom /* yes -> prom */
1495 /* Save parameters */
1499 /* Make sure we are running in 64 bits mode */
1502 /* Setup some critical 970 SPRs before switching MMU off */
1503 bl .__970_cpu_preinit
1508 /* Switch off MMU if not already */
1509 LOADADDR(r4, .__after_prom_start - KERNELBASE)
1512 b .__after_prom_start
1514 _STATIC(__boot_from_prom)
1515 /* Save parameters */
1522 /* Make sure we are running in 64 bits mode */
1525 /* put a relocation offset into r3 */
1528 LOADADDR(r2,__toc_start)
1532 /* Relocate the TOC from a virt addr to a real addr */
1535 /* Restore parameters */
1542 /* Do all of the interaction with OF client interface */
1544 /* We never return */
1548 * At this point, r3 contains the physical address we are running at,
1549 * returned by prom_init()
1551 _STATIC(__after_prom_start)
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.
1561 * Note: This process overwrites the OF exception vectors.
1562 * r26 == relocation offset
1567 SET_REG_TO_CONST(r27,KERNELBASE)
1569 li r3,0 /* target addr */
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 */
1577 LOADADDR(r5,copy_to_here) /* # bytes of memory to copy */
1580 li r6,0x100 /* Start offset, the first 0x100 */
1581 /* bytes were copied earlier. */
1583 bl .copy_and_flush /* copy the first n bytes */
1584 /* this includes the code being */
1585 /* executed here. */
1587 LOADADDR(r0, 4f) /* Jump to the copy of this code */
1588 mtctr r0 /* that we just made/relocated */
1591 4: LOADADDR(r5,klimit)
1593 ld r5,0(r5) /* get the value of klimit */
1595 bl .copy_and_flush /* copy the rest */
1596 b .start_here_multiplatform
1598 #endif /* CONFIG_PPC_MULTIPLATFORM */
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.
1606 * Note: this routine *only* clobbers r0, r6 and lr
1608 _GLOBAL(copy_and_flush)
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 */
1620 mtctr r0 /* put # words/line in ctr */
1621 3: addi r6,r6,8 /* copy a cache line */
1625 dcbst r6,r3 /* write it to memory */
1627 icbi r6,r3 /* flush the icache line */
1639 #ifdef CONFIG_PPC_PMAC
1641 * On PowerMac, secondary processors starts from the reset vector, which
1642 * is temporarily turned into a call to one of the functions below.
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. */
1659 _GLOBAL(pmac_secondary_start)
1660 /* turn on 64-bit mode */
1664 /* Copy some CPU settings from CPU 0 */
1665 bl .__restore_cpu_setup
1667 /* pSeries do that early though I don't think we really need it */
1670 mtmsrd r3 /* RI on */
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 */
1678 /* Create a temp kernel stack for use before relocation is on. */
1679 ld r1,PACAEMERGSP(r13)
1680 subi r1,r1,STACK_FRAME_OVERHEAD
1682 b .__secondary_start
1684 #endif /* CONFIG_PPC_PMAC */
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
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
1699 _GLOBAL(__secondary_start)
1701 HMT_MEDIUM /* Set thread priority to MEDIUM */
1705 stb r6,PACAPROCENABLED(r13)
1707 #ifndef CONFIG_PPC_ISERIES
1708 /* Initialize the page table pointer register. */
1710 ld r6,0(r6) /* get the value of _SDR1 */
1711 mtspr SPRN_SDR1,r6 /* set the htab location */
1713 /* Initialize the first segment table (or SLB) entry */
1714 ld r3,PACASTABVIRT(r13) /* get addr of segment table */
1717 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1720 /* Initialize the kernel stack. Just a repeat for iSeries. */
1721 LOADADDR(r3,current_set)
1722 sldi r28,r24,3 /* get current_set[cpu#] */
1724 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1725 std r1,PACAKSAVE(r13)
1727 ld r3,PACASTABREAL(r13) /* get raddr of segment table */
1728 ori r4,r3,1 /* turn on valid bit */
1730 #ifdef CONFIG_PPC_ISERIES
1731 li r0,-1 /* hypervisor call */
1733 sldi r3,r3,63 /* 0x8000000000000000 */
1734 ori r3,r3,4 /* 0x8000000000000004 */
1735 sc /* HvCall_setASR */
1738 ld r3,systemcfg@got(r2) /* r3 = ptr to systemcfg */
1740 lwz r3,PLATFORM(r3) /* r3 = platform flags */
1741 andi. r3,r3,PLATFORM_LPAR /* Test if bit 0 is set (LPAR bit) */
1742 beq 98f /* branch if result is 0 */
1745 cmpwi r3,0x37 /* SStar */
1747 cmpwi r3,0x36 /* IStar */
1749 cmpwi r3,0x34 /* Pulsar */
1751 97: li r3,H_SET_ASR /* hcall = H_SET_ASR */
1752 HVSC /* Invoking hcall */
1754 98: /* !(rpa hypervisor) || !(star) */
1755 mtasr r4 /* set the stab location */
1761 /* enable MMU and jump to start_secondary */
1762 LOADADDR(r3,.start_secondary_prolog)
1763 SET_REG_TO_CONST(r4, MSR_KERNEL)
1764 #ifdef DO_SOFT_DISABLE
1770 b . /* prevent speculative execution */
1773 * Running with relocation on at this point. All we want to do is
1774 * zero the stack back-chain pointer before going into C code.
1776 _GLOBAL(start_secondary_prolog)
1778 std r3,0(r1) /* Zero the stack frame pointer */
1783 * This subroutine clobbers r11 and r12
1785 _GLOBAL(enable_64b_mode)
1786 mfmsr r11 /* grab the current MSR */
1788 rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1791 rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1797 #ifdef CONFIG_PPC_MULTIPLATFORM
1799 * This is where the main kernel code starts.
1801 _STATIC(start_here_multiplatform)
1802 /* get a new offset, now that the kernel has moved. */
1806 /* Clear out the BSS. It may have been done in prom_init,
1807 * already but that's irrelevant since prom_init will soon
1808 * be detached from the kernel completely. Besides, we need
1809 * to clear it now for kexec-style entry.
1811 LOADADDR(r11,__bss_stop)
1812 LOADADDR(r8,__bss_start)
1813 sub r11,r11,r8 /* bss size */
1814 addi r11,r11,7 /* round up to an even double word */
1815 rldicl. r11,r11,61,3 /* shift right by 3 */
1819 mtctr r11 /* zero this many doublewords */
1826 mtmsrd r6 /* RI on */
1829 /* Start up the second thread on cpu 0 */
1832 cmpwi r3,0x34 /* Pulsar */
1834 cmpwi r3,0x36 /* Icestar */
1836 cmpwi r3,0x37 /* SStar */
1838 b 91f /* HMT not supported */
1840 bl .hmt_start_secondary
1844 /* The following gets the stack and TOC set up with the regs */
1845 /* pointing to the real addr of the kernel stack. This is */
1846 /* all done to support the C function call below which sets */
1847 /* up the htab. This is done because we have relocated the */
1848 /* kernel but are still running in real mode. */
1850 LOADADDR(r3,init_thread_union)
1853 /* set up a stack pointer (physical address) */
1854 addi r1,r3,THREAD_SIZE
1856 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1858 /* set up the TOC (physical address) */
1859 LOADADDR(r2,__toc_start)
1864 LOADADDR(r3,cpu_specs)
1866 LOADADDR(r4,cur_cpu_spec)
1871 /* Save some low level config HIDs of CPU0 to be copied to
1872 * other CPUs later on, or used for suspend/resume
1874 bl .__save_cpu_setup
1877 /* Setup a valid physical PACA pointer in SPRG3 for early_setup
1878 * note that boot_cpuid can always be 0 nowadays since there is
1879 * nowhere it can be initialized differently before we reach this
1882 LOADADDR(r27, boot_cpuid)
1886 LOADADDR(r24, paca) /* Get base vaddr of paca array */
1887 mulli r13,r27,PACA_SIZE /* Calculate vaddr of right paca */
1888 add r13,r13,r24 /* for this processor. */
1889 add r13,r13,r26 /* convert to physical addr */
1890 mtspr SPRN_SPRG3,r13 /* PPPBBB: Temp... -Peter */
1892 /* Do very early kernel initializations, including initial hash table,
1893 * stab and slb setup before we turn on relocation. */
1895 /* Restore parameters passed from prom_init/kexec */
1900 ld r3,PACASTABREAL(r13)
1901 ori r4,r3,1 /* turn on valid bit */
1902 ld r3,systemcfg@got(r2) /* r3 = ptr to systemcfg */
1904 lwz r3,PLATFORM(r3) /* r3 = platform flags */
1905 andi. r3,r3,PLATFORM_LPAR /* Test if bit 0 is set (LPAR bit) */
1906 beq 98f /* branch if result is 0 */
1909 cmpwi r3,0x37 /* SStar */
1911 cmpwi r3,0x36 /* IStar */
1913 cmpwi r3,0x34 /* Pulsar */
1915 97: li r3,H_SET_ASR /* hcall = H_SET_ASR */
1916 HVSC /* Invoking hcall */
1918 98: /* !(rpa hypervisor) || !(star) */
1919 mtasr r4 /* set the stab location */
1921 /* Set SDR1 (hash table pointer) */
1922 ld r3,systemcfg@got(r2) /* r3 = ptr to systemcfg */
1924 lwz r3,PLATFORM(r3) /* r3 = platform flags */
1925 /* Test if bit 0 is set (LPAR bit) */
1926 andi. r3,r3,PLATFORM_LPAR
1927 bne 98f /* branch if result is !0 */
1928 LOADADDR(r6,_SDR1) /* Only if NOT LPAR */
1930 ld r6,0(r6) /* get the value of _SDR1 */
1931 mtspr SPRN_SDR1,r6 /* set the htab location */
1933 LOADADDR(r3,.start_here_common)
1934 SET_REG_TO_CONST(r4, MSR_KERNEL)
1938 b . /* prevent speculative execution */
1939 #endif /* CONFIG_PPC_MULTIPLATFORM */
1941 /* This is where all platforms converge execution */
1942 _STATIC(start_here_common)
1943 /* relocation is on at this point */
1945 /* The following code sets up the SP and TOC now that we are */
1946 /* running with translation enabled. */
1948 LOADADDR(r3,init_thread_union)
1950 /* set up the stack */
1951 addi r1,r3,THREAD_SIZE
1953 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1955 /* Apply the CPUs-specific fixups (nop out sections not relevant
1959 bl .do_cpu_ftr_fixups
1961 LOADADDR(r26, boot_cpuid)
1964 LOADADDR(r24, paca) /* Get base vaddr of paca array */
1965 mulli r13,r26,PACA_SIZE /* Calculate vaddr of right paca */
1966 add r13,r13,r24 /* for this processor. */
1967 mtspr SPRN_SPRG3,r13
1969 /* ptr to current */
1970 LOADADDR(r4,init_task)
1971 std r4,PACACURRENT(r13)
1975 std r1,PACAKSAVE(r13)
1979 /* Load up the kernel context */
1981 #ifdef DO_SOFT_DISABLE
1983 stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
1985 ori r5,r5,MSR_EE /* Hard Enabled */
1993 LOADADDR(r5, hmt_thread_data)
1996 cmpwi r7,0x34 /* Pulsar */
1998 cmpwi r7,0x36 /* Icestar */
2000 cmpwi r7,0x37 /* SStar */
2003 90: mfspr r6,SPRN_PIR
2006 91: mfspr r6,SPRN_PIR
2010 bl .hmt_start_secondary
2013 __hmt_secondary_hold:
2014 LOADADDR(r5, hmt_thread_data)
2024 93: andi. r6,r6,0x3f
2038 b .pSeries_secondary_smp_init
2041 _GLOBAL(hmt_start_secondary)
2042 LOADADDR(r4,__hmt_secondary_hold)
2044 mtspr SPRN_NIADORM, r4
2045 mfspr r4, SPRN_MSRDORM
2048 mtspr SPRN_MSRDORM, r4
2057 mfspr r4, SPRN_CTRLF
2059 mtspr SPRN_CTRLT, r4
2064 * We put a few things here that have to be page-aligned.
2065 * This stuff goes at the beginning of the bss, which is page-aligned.
2071 .globl empty_zero_page
2075 .globl swapper_pg_dir
2080 * This space gets a copy of optional info passed to us by the bootstrap
2081 * Used to pass parameters into the kernel like root=/dev/sda1, etc.
2085 .space COMMAND_LINE_SIZE