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/ppc_asm.h>
32 #include <asm/asm-offsets.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>
40 #ifdef CONFIG_PPC_ISERIES
41 #define DO_SOFT_DISABLE
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
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
66 * Entering into this code we make the following assumptions:
68 * 1. The MMU is off & open firmware is running in real mode.
69 * 2. The kernel is entered at __start
72 * 1. The MMU is on (as it always is for iSeries)
73 * 2. The kernel is entered at system_reset_iSeries
79 #ifdef CONFIG_PPC_MULTIPLATFORM
81 /* NOP this out unconditionally */
83 b .__start_initialization_multiplatform
85 #endif /* CONFIG_PPC_MULTIPLATFORM */
87 /* Catch branch to 0 in real mode */
90 #ifdef CONFIG_PPC_ISERIES
92 * At offset 0x20, there is a pointer to iSeries LPAR data.
93 * This is required by the hypervisor
96 .llong hvReleaseData-KERNELBASE
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)
104 .llong mschunks_map-KERNELBASE
105 .llong 0 /* pidhash-KERNELBASE SFRXXX */
107 /* Offset 0x38 - Pointer to start of embedded System.map */
108 .globl embedded_sysmap_start
109 embedded_sysmap_start:
111 /* Offset 0x40 - Pointer to end of embedded System.map */
112 .globl embedded_sysmap_end
116 #endif /* CONFIG_PPC_ISERIES */
118 /* Secondary processors spin on this value until it goes to 1. */
119 .globl __secondary_hold_spinloop
120 __secondary_hold_spinloop:
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:
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.
137 _GLOBAL(__secondary_hold)
140 mtmsrd r24 /* RI on */
142 /* Grab our physical cpu number */
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)
151 /* All secondary cpus wait here until told to start. */
152 100: ld r4,__secondary_hold_spinloop@l(0)
156 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
157 LOAD_REG_IMMEDIATE(r4, .pSeries_secondary_smp_init)
165 /* This value is used to mark exception frames on the stack. */
168 .tc ID_72656773_68657265[TC],0x7265677368657265
172 * The following macros define the code that appears as
173 * the prologue to each of the exception handlers. They
174 * are split into two parts to allow a single kernel binary
175 * to be used for pSeries and iSeries.
176 * LOL. One day... - paulus
180 * We make as much of the exception code common between native
181 * exception handlers (including pSeries LPAR) and iSeries LPAR
182 * implementations as possible.
186 * This is the start of the interrupt handlers for pSeries
187 * This code runs with relocation off.
202 * We're short on space and time in the exception prolog, so we can't
203 * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
204 * low halfword of the address, but for Kdump we need the whole low
207 #ifdef CONFIG_CRASH_DUMP
208 #define LOAD_HANDLER(reg, label) \
209 oris reg,reg,(label)@h; /* virt addr of handler ... */ \
210 ori reg,reg,(label)@l; /* .. and the rest */
212 #define LOAD_HANDLER(reg, label) \
213 ori reg,reg,(label)@l; /* virt addr of handler ... */
216 #define EXCEPTION_PROLOG_PSERIES(area, label) \
217 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
218 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
219 std r10,area+EX_R10(r13); \
220 std r11,area+EX_R11(r13); \
221 std r12,area+EX_R12(r13); \
222 mfspr r9,SPRN_SPRG1; \
223 std r9,area+EX_R13(r13); \
225 clrrdi r12,r13,32; /* get high part of &label */ \
227 mfspr r11,SPRN_SRR0; /* save SRR0 */ \
228 LOAD_HANDLER(r12,label) \
229 ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
230 mtspr SPRN_SRR0,r12; \
231 mfspr r12,SPRN_SRR1; /* and SRR1 */ \
232 mtspr SPRN_SRR1,r10; \
234 b . /* prevent speculative execution */
237 * This is the start of the interrupt handlers for iSeries
238 * This code runs with relocation on.
240 #define EXCEPTION_PROLOG_ISERIES_1(area) \
241 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
242 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
243 std r10,area+EX_R10(r13); \
244 std r11,area+EX_R11(r13); \
245 std r12,area+EX_R12(r13); \
246 mfspr r9,SPRN_SPRG1; \
247 std r9,area+EX_R13(r13); \
250 #define EXCEPTION_PROLOG_ISERIES_2 \
252 ld r12,PACALPPACAPTR(r13); \
253 ld r11,LPPACASRR0(r12); \
254 ld r12,LPPACASRR1(r12); \
255 ori r10,r10,MSR_RI; \
259 * The common exception prolog is used for all except a few exceptions
260 * such as a segment miss on a kernel address. We have to be prepared
261 * to take another exception from the point where we first touch the
262 * kernel stack onwards.
264 * On entry r13 points to the paca, r9-r13 are saved in the paca,
265 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
266 * SRR1, and relocation is on.
268 #define EXCEPTION_PROLOG_COMMON(n, area) \
269 andi. r10,r12,MSR_PR; /* See if coming from user */ \
270 mr r10,r1; /* Save r1 */ \
271 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
273 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
274 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
275 bge- cr1,bad_stack; /* abort if it is */ \
276 std r9,_CCR(r1); /* save CR in stackframe */ \
277 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
278 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
279 std r10,0(r1); /* make stack chain pointer */ \
280 std r0,GPR0(r1); /* save r0 in stackframe */ \
281 std r10,GPR1(r1); /* save r1 in stackframe */ \
282 std r2,GPR2(r1); /* save r2 in stackframe */ \
283 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
284 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
285 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
286 ld r10,area+EX_R10(r13); \
289 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
290 ld r10,area+EX_R12(r13); \
291 ld r11,area+EX_R13(r13); \
295 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
296 mflr r9; /* save LR in stackframe */ \
298 mfctr r10; /* save CTR in stackframe */ \
300 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
303 std r9,_TRAP(r1); /* set trap number */ \
305 ld r11,exception_marker@toc(r2); \
306 std r10,RESULT(r1); /* clear regs->result */ \
307 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
312 #define STD_EXCEPTION_PSERIES(n, label) \
314 .globl label##_pSeries; \
317 mtspr SPRN_SPRG1,r13; /* save r13 */ \
318 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
320 #define STD_EXCEPTION_ISERIES(n, label, area) \
321 .globl label##_iSeries; \
324 mtspr SPRN_SPRG1,r13; /* save r13 */ \
325 EXCEPTION_PROLOG_ISERIES_1(area); \
326 EXCEPTION_PROLOG_ISERIES_2; \
329 #define MASKABLE_EXCEPTION_ISERIES(n, label) \
330 .globl label##_iSeries; \
333 mtspr SPRN_SPRG1,r13; /* save r13 */ \
334 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
335 lbz r10,PACAPROCENABLED(r13); \
337 beq- label##_iSeries_masked; \
338 EXCEPTION_PROLOG_ISERIES_2; \
341 #ifdef DO_SOFT_DISABLE
342 #define DISABLE_INTS \
343 lbz r10,PACAPROCENABLED(r13); \
347 stb r11,PACAPROCENABLED(r13); \
348 ori r10,r10,MSR_EE; \
351 #define ENABLE_INTS \
352 lbz r10,PACAPROCENABLED(r13); \
355 ori r11,r11,MSR_EE; \
358 #else /* hard enable/disable interrupts */
361 #define ENABLE_INTS \
364 rlwimi r11,r12,0,MSR_EE; \
369 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
371 .globl label##_common; \
373 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
376 addi r3,r1,STACK_FRAME_OVERHEAD; \
380 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
382 .globl label##_common; \
384 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
386 bl .ppc64_runlatch_on; \
387 addi r3,r1,STACK_FRAME_OVERHEAD; \
389 b .ret_from_except_lite
392 * Start of pSeries system interrupt routines
395 .globl __start_interrupts
398 STD_EXCEPTION_PSERIES(0x100, system_reset)
401 _machine_check_pSeries:
403 mtspr SPRN_SPRG1,r13 /* save r13 */
404 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
407 .globl data_access_pSeries
416 rlwimi r13,r12,16,0x20
419 beq .do_stab_bolted_pSeries
422 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
423 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
426 .globl data_access_slb_pSeries
427 data_access_slb_pSeries:
430 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
431 std r3,PACA_EXSLB+EX_R3(r13)
433 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
436 /* Keep that around for when we re-implement dynamic VSIDs */
438 bge slb_miss_user_pseries
439 #endif /* __DISABLED__ */
440 std r10,PACA_EXSLB+EX_R10(r13)
441 std r11,PACA_EXSLB+EX_R11(r13)
442 std r12,PACA_EXSLB+EX_R12(r13)
444 std r10,PACA_EXSLB+EX_R13(r13)
445 mfspr r12,SPRN_SRR1 /* and SRR1 */
446 b .slb_miss_realmode /* Rel. branch works in real mode */
448 STD_EXCEPTION_PSERIES(0x400, instruction_access)
451 .globl instruction_access_slb_pSeries
452 instruction_access_slb_pSeries:
455 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
456 std r3,PACA_EXSLB+EX_R3(r13)
457 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
458 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
461 /* Keep that around for when we re-implement dynamic VSIDs */
463 bge slb_miss_user_pseries
464 #endif /* __DISABLED__ */
465 std r10,PACA_EXSLB+EX_R10(r13)
466 std r11,PACA_EXSLB+EX_R11(r13)
467 std r12,PACA_EXSLB+EX_R12(r13)
469 std r10,PACA_EXSLB+EX_R13(r13)
470 mfspr r12,SPRN_SRR1 /* and SRR1 */
471 b .slb_miss_realmode /* Rel. branch works in real mode */
473 STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
474 STD_EXCEPTION_PSERIES(0x600, alignment)
475 STD_EXCEPTION_PSERIES(0x700, program_check)
476 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
477 STD_EXCEPTION_PSERIES(0x900, decrementer)
478 STD_EXCEPTION_PSERIES(0xa00, trap_0a)
479 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
482 .globl system_call_pSeries
490 oris r12,r12,system_call_common@h
491 ori r12,r12,system_call_common@l
493 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
497 b . /* prevent speculative execution */
499 STD_EXCEPTION_PSERIES(0xd00, single_step)
500 STD_EXCEPTION_PSERIES(0xe00, trap_0e)
502 /* We need to deal with the Altivec unavailable exception
503 * here which is at 0xf20, thus in the middle of the
504 * prolog code of the PerformanceMonitor one. A little
505 * trickery is thus necessary
508 b performance_monitor_pSeries
510 STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
512 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
513 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
517 /*** pSeries interrupt support ***/
519 /* moved from 0xf00 */
520 STD_EXCEPTION_PSERIES(., performance_monitor)
523 _GLOBAL(do_stab_bolted_pSeries)
526 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
529 * We have some room here we use that to put
530 * the peries slb miss user trampoline code so it's reasonably
531 * away from slb_miss_user_common to avoid problems with rfid
533 * This is used for when the SLB miss handler has to go virtual,
534 * which doesn't happen for now anymore but will once we re-implement
535 * dynamic VSIDs for shared page tables
538 slb_miss_user_pseries:
539 std r10,PACA_EXGEN+EX_R10(r13)
540 std r11,PACA_EXGEN+EX_R11(r13)
541 std r12,PACA_EXGEN+EX_R12(r13)
543 ld r11,PACA_EXSLB+EX_R9(r13)
544 ld r12,PACA_EXSLB+EX_R3(r13)
545 std r10,PACA_EXGEN+EX_R13(r13)
546 std r11,PACA_EXGEN+EX_R9(r13)
547 std r12,PACA_EXGEN+EX_R3(r13)
550 mfspr r11,SRR0 /* save SRR0 */
551 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
552 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
554 mfspr r12,SRR1 /* and SRR1 */
557 b . /* prevent spec. execution */
558 #endif /* __DISABLED__ */
561 * Vectors for the FWNMI option. Share common code.
563 .globl system_reset_fwnmi
567 mtspr SPRN_SPRG1,r13 /* save r13 */
568 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
570 .globl machine_check_fwnmi
574 mtspr SPRN_SPRG1,r13 /* save r13 */
575 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
577 #ifdef CONFIG_PPC_ISERIES
578 /*** ISeries-LPAR interrupt handlers ***/
580 STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
582 .globl data_access_iSeries
590 rlwimi r13,r12,16,0x20
593 beq .do_stab_bolted_iSeries
596 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
597 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
598 EXCEPTION_PROLOG_ISERIES_2
601 .do_stab_bolted_iSeries:
604 EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
605 EXCEPTION_PROLOG_ISERIES_2
608 .globl data_access_slb_iSeries
609 data_access_slb_iSeries:
610 mtspr SPRN_SPRG1,r13 /* save r13 */
611 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
612 std r3,PACA_EXSLB+EX_R3(r13)
614 std r9,PACA_EXSLB+EX_R9(r13)
618 bge slb_miss_user_iseries
620 std r10,PACA_EXSLB+EX_R10(r13)
621 std r11,PACA_EXSLB+EX_R11(r13)
622 std r12,PACA_EXSLB+EX_R12(r13)
624 std r10,PACA_EXSLB+EX_R13(r13)
625 ld r12,PACALPPACAPTR(r13)
626 ld r12,LPPACASRR1(r12)
629 STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
631 .globl instruction_access_slb_iSeries
632 instruction_access_slb_iSeries:
633 mtspr SPRN_SPRG1,r13 /* save r13 */
634 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
635 std r3,PACA_EXSLB+EX_R3(r13)
636 ld r3,PACALPPACAPTR(r13)
637 ld r3,LPPACASRR0(r3) /* get SRR0 value */
638 std r9,PACA_EXSLB+EX_R9(r13)
642 bge .slb_miss_user_iseries
644 std r10,PACA_EXSLB+EX_R10(r13)
645 std r11,PACA_EXSLB+EX_R11(r13)
646 std r12,PACA_EXSLB+EX_R12(r13)
648 std r10,PACA_EXSLB+EX_R13(r13)
649 ld r12,PACALPPACAPTR(r13)
650 ld r12,LPPACASRR1(r12)
654 slb_miss_user_iseries:
655 std r10,PACA_EXGEN+EX_R10(r13)
656 std r11,PACA_EXGEN+EX_R11(r13)
657 std r12,PACA_EXGEN+EX_R12(r13)
659 ld r11,PACA_EXSLB+EX_R9(r13)
660 ld r12,PACA_EXSLB+EX_R3(r13)
661 std r10,PACA_EXGEN+EX_R13(r13)
662 std r11,PACA_EXGEN+EX_R9(r13)
663 std r12,PACA_EXGEN+EX_R3(r13)
664 EXCEPTION_PROLOG_ISERIES_2
665 b slb_miss_user_common
668 MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
669 STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
670 STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
671 STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
672 MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
673 STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
674 STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
676 .globl system_call_iSeries
680 EXCEPTION_PROLOG_ISERIES_2
683 STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
684 STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
685 STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
687 .globl system_reset_iSeries
688 system_reset_iSeries:
689 mfspr r13,SPRN_SPRG3 /* Get paca address */
692 mtmsrd r24 /* RI on */
693 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
694 cmpwi 0,r24,0 /* Are we processor 0? */
695 beq .__start_initialization_iSeries /* Start up the first processor */
697 li r5,CTRL_RUNLATCH /* Turn off the run light */
704 lbz r23,PACAPROCSTART(r13) /* Test if this processor
707 LOAD_REG_IMMEDIATE(r3,current_set)
708 sldi r28,r24,3 /* get current_set[cpu#] */
710 addi r1,r3,THREAD_SIZE
711 subi r1,r1,STACK_FRAME_OVERHEAD
714 beq iSeries_secondary_smp_loop /* Loop until told to go */
715 bne .__secondary_start /* Loop until told to go */
716 iSeries_secondary_smp_loop:
717 /* Let the Hypervisor know we are alive */
718 /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
720 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
721 #else /* CONFIG_SMP */
722 /* Yield the processor. This is required for non-SMP kernels
723 which are running on multi-threaded machines. */
725 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
726 addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
727 li r4,0 /* "yield timed" */
728 li r5,-1 /* "yield forever" */
729 #endif /* CONFIG_SMP */
730 li r0,-1 /* r0=-1 indicates a Hypervisor call */
731 sc /* Invoke the hypervisor via a system call */
732 mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
733 b 1b /* If SMP not configured, secondaries
736 .globl decrementer_iSeries_masked
737 decrementer_iSeries_masked:
738 /* We may not have a valid TOC pointer in here. */
740 ld r12,PACALPPACAPTR(r13)
741 stb r11,LPPACADECRINT(r12)
742 LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy)
747 .globl hardware_interrupt_iSeries_masked
748 hardware_interrupt_iSeries_masked:
749 mtcrf 0x80,r9 /* Restore regs */
750 ld r12,PACALPPACAPTR(r13)
751 ld r11,LPPACASRR0(r12)
752 ld r12,LPPACASRR1(r12)
755 ld r9,PACA_EXGEN+EX_R9(r13)
756 ld r10,PACA_EXGEN+EX_R10(r13)
757 ld r11,PACA_EXGEN+EX_R11(r13)
758 ld r12,PACA_EXGEN+EX_R12(r13)
759 ld r13,PACA_EXGEN+EX_R13(r13)
761 b . /* prevent speculative execution */
762 #endif /* CONFIG_PPC_ISERIES */
764 /*** Common interrupt handlers ***/
766 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
769 * Machine check is different because we use a different
770 * save area: PACA_EXMC instead of PACA_EXGEN.
773 .globl machine_check_common
774 machine_check_common:
775 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
778 addi r3,r1,STACK_FRAME_OVERHEAD
779 bl .machine_check_exception
782 STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt)
783 STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
784 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
785 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
786 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
787 STD_EXCEPTION_COMMON(0xf00, performance_monitor, .performance_monitor_exception)
788 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
789 #ifdef CONFIG_ALTIVEC
790 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
792 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
796 * Here we have detected that the kernel stack pointer is bad.
797 * R9 contains the saved CR, r13 points to the paca,
798 * r10 contains the (bad) kernel stack pointer,
799 * r11 and r12 contain the saved SRR0 and SRR1.
800 * We switch to using an emergency stack, save the registers there,
801 * and call kernel_bad_stack(), which panics.
804 ld r1,PACAEMERGSP(r13)
805 subi r1,r1,64+INT_FRAME_SIZE
826 addi r11,r1,INT_FRAME_SIZE
831 1: addi r3,r1,STACK_FRAME_OVERHEAD
836 * Return from an exception with minimal checks.
837 * The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
838 * If interrupts have been enabled, or anything has been
839 * done that might have changed the scheduling status of
840 * any task or sent any task a signal, you should use
841 * ret_from_except or ret_from_except_lite instead of this.
843 .globl fast_exception_return
844 fast_exception_return:
847 andi. r3,r12,MSR_RI /* check if RI is set */
861 clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
869 b . /* prevent speculative execution */
873 1: addi r3,r1,STACK_FRAME_OVERHEAD
874 bl .unrecoverable_exception
878 * Here r13 points to the paca, r9 contains the saved CR,
879 * SRR0 and SRR1 are saved in r11 and r12,
880 * r9 - r13 are saved in paca->exgen.
883 .globl data_access_common
886 std r10,PACA_EXGEN+EX_DAR(r13)
888 stw r10,PACA_EXGEN+EX_DSISR(r13)
889 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
890 ld r3,PACA_EXGEN+EX_DAR(r13)
891 lwz r4,PACA_EXGEN+EX_DSISR(r13)
893 b .do_hash_page /* Try to handle as hpte fault */
896 .globl instruction_access_common
897 instruction_access_common:
898 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
902 b .do_hash_page /* Try to handle as hpte fault */
905 * Here is the common SLB miss user that is used when going to virtual
906 * mode for SLB misses, that is currently not used
910 .globl slb_miss_user_common
911 slb_miss_user_common:
913 std r3,PACA_EXGEN+EX_DAR(r13)
914 stw r9,PACA_EXGEN+EX_CCR(r13)
915 std r10,PACA_EXGEN+EX_LR(r13)
916 std r11,PACA_EXGEN+EX_SRR0(r13)
917 bl .slb_allocate_user
919 ld r10,PACA_EXGEN+EX_LR(r13)
920 ld r3,PACA_EXGEN+EX_R3(r13)
921 lwz r9,PACA_EXGEN+EX_CCR(r13)
922 ld r11,PACA_EXGEN+EX_SRR0(r13)
926 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
927 beq- unrecov_user_slb
935 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
941 ld r9,PACA_EXGEN+EX_R9(r13)
942 ld r10,PACA_EXGEN+EX_R10(r13)
943 ld r11,PACA_EXGEN+EX_R11(r13)
944 ld r12,PACA_EXGEN+EX_R12(r13)
945 ld r13,PACA_EXGEN+EX_R13(r13)
950 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
951 ld r4,PACA_EXGEN+EX_DAR(r13)
958 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
961 1: addi r3,r1,STACK_FRAME_OVERHEAD
962 bl .unrecoverable_exception
965 #endif /* __DISABLED__ */
969 * r13 points to the PACA, r9 contains the saved CR,
970 * r12 contain the saved SRR1, SRR0 is still ready for return
971 * r3 has the faulting address
972 * r9 - r13 are saved in paca->exslb.
973 * r3 is saved in paca->slb_r3
974 * We assume we aren't going to take any exceptions during this procedure.
976 _GLOBAL(slb_miss_realmode)
979 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
980 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
982 bl .slb_allocate_realmode
984 /* All done -- return from exception. */
986 ld r10,PACA_EXSLB+EX_LR(r13)
987 ld r3,PACA_EXSLB+EX_R3(r13)
988 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
989 #ifdef CONFIG_PPC_ISERIES
990 ld r11,PACALPPACAPTR(r13)
991 ld r11,LPPACASRR0(r11) /* get SRR0 value */
992 #endif /* CONFIG_PPC_ISERIES */
996 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1002 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1005 #ifdef CONFIG_PPC_ISERIES
1008 #endif /* CONFIG_PPC_ISERIES */
1009 ld r9,PACA_EXSLB+EX_R9(r13)
1010 ld r10,PACA_EXSLB+EX_R10(r13)
1011 ld r11,PACA_EXSLB+EX_R11(r13)
1012 ld r12,PACA_EXSLB+EX_R12(r13)
1013 ld r13,PACA_EXSLB+EX_R13(r13)
1015 b . /* prevent speculative execution */
1018 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1021 1: addi r3,r1,STACK_FRAME_OVERHEAD
1022 bl .unrecoverable_exception
1026 .globl hardware_interrupt_common
1027 .globl hardware_interrupt_entry
1028 hardware_interrupt_common:
1029 EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
1030 hardware_interrupt_entry:
1032 bl .ppc64_runlatch_on
1033 addi r3,r1,STACK_FRAME_OVERHEAD
1035 b .ret_from_except_lite
1038 .globl alignment_common
1041 std r10,PACA_EXGEN+EX_DAR(r13)
1042 mfspr r10,SPRN_DSISR
1043 stw r10,PACA_EXGEN+EX_DSISR(r13)
1044 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1045 ld r3,PACA_EXGEN+EX_DAR(r13)
1046 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1050 addi r3,r1,STACK_FRAME_OVERHEAD
1052 bl .alignment_exception
1056 .globl program_check_common
1057 program_check_common:
1058 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1060 addi r3,r1,STACK_FRAME_OVERHEAD
1062 bl .program_check_exception
1066 .globl fp_unavailable_common
1067 fp_unavailable_common:
1068 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1069 bne .load_up_fpu /* if from user, just load it up */
1071 addi r3,r1,STACK_FRAME_OVERHEAD
1073 bl .kernel_fp_unavailable_exception
1077 .globl altivec_unavailable_common
1078 altivec_unavailable_common:
1079 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1080 #ifdef CONFIG_ALTIVEC
1082 bne .load_up_altivec /* if from user, just load it up */
1083 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1086 addi r3,r1,STACK_FRAME_OVERHEAD
1088 bl .altivec_unavailable_exception
1091 #ifdef CONFIG_ALTIVEC
1093 * load_up_altivec(unused, unused, tsk)
1094 * Disable VMX for the task which had it previously,
1095 * and save its vector registers in its thread_struct.
1096 * Enables the VMX for use in the kernel on return.
1097 * On SMP we know the VMX is free, since we give it up every
1098 * switch (ie, no lazy save of the vector registers).
1099 * On entry: r13 == 'current' && last_task_used_altivec != 'current'
1101 _STATIC(load_up_altivec)
1102 mfmsr r5 /* grab the current MSR */
1103 oris r5,r5,MSR_VEC@h
1104 mtmsrd r5 /* enable use of VMX now */
1108 * For SMP, we don't do lazy VMX switching because it just gets too
1109 * horrendously complex, especially when a task switches from one CPU
1110 * to another. Instead we call giveup_altvec in switch_to.
1111 * VRSAVE isn't dealt with here, that is done in the normal context
1112 * switch code. Note that we could rely on vrsave value to eventually
1113 * avoid saving all of the VREGs here...
1116 ld r3,last_task_used_altivec@got(r2)
1120 /* Save VMX state to last_task_used_altivec's THREAD struct */
1126 /* Disable VMX for last_task_used_altivec */
1128 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1131 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1133 #endif /* CONFIG_SMP */
1134 /* Hack: if we get an altivec unavailable trap with VRSAVE
1135 * set to all zeros, we assume this is a broken application
1136 * that fails to set it properly, and thus we switch it to
1139 mfspr r4,SPRN_VRSAVE
1143 mtspr SPRN_VRSAVE,r4
1145 /* enable use of VMX after return */
1146 ld r4,PACACURRENT(r13)
1147 addi r5,r4,THREAD /* Get THREAD */
1148 oris r12,r12,MSR_VEC@h
1152 stw r4,THREAD_USED_VR(r5)
1157 /* Update last_task_used_math to 'current' */
1158 subi r4,r5,THREAD /* Back to 'current' */
1160 #endif /* CONFIG_SMP */
1161 /* restore registers and return */
1162 b fast_exception_return
1163 #endif /* CONFIG_ALTIVEC */
1169 _GLOBAL(do_hash_page)
1173 andis. r0,r4,0xa450 /* weird error? */
1174 bne- .handle_page_fault /* if not, try to insert a HPTE */
1176 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1177 bne- .do_ste_alloc /* If so handle it */
1178 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1181 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1182 * accessing a userspace segment (even from the kernel). We assume
1183 * kernel addresses always have the high bit set.
1185 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1186 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1187 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1188 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1189 ori r4,r4,1 /* add _PAGE_PRESENT */
1190 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1193 * On iSeries, we soft-disable interrupts here, then
1194 * hard-enable interrupts so that the hash_page code can spin on
1195 * the hash_table_lock without problems on a shared processor.
1200 * r3 contains the faulting address
1201 * r4 contains the required access permissions
1202 * r5 contains the trap number
1204 * at return r3 = 0 for success
1206 bl .hash_page /* build HPTE if possible */
1207 cmpdi r3,0 /* see if hash_page succeeded */
1209 #ifdef DO_SOFT_DISABLE
1211 * If we had interrupts soft-enabled at the point where the
1212 * DSI/ISI occurred, and an interrupt came in during hash_page,
1214 * We jump to ret_from_except_lite rather than fast_exception_return
1215 * because ret_from_except_lite will check for and handle pending
1216 * interrupts if necessary.
1218 beq .ret_from_except_lite
1219 /* For a hash failure, we don't bother re-enabling interrupts */
1223 * hash_page couldn't handle it, set soft interrupt enable back
1224 * to what it was before the trap. Note that .local_irq_restore
1225 * handles any interrupts pending at this point.
1228 bl .local_irq_restore
1231 beq fast_exception_return /* Return from exception on success */
1232 ble- 12f /* Failure return from hash_page */
1237 /* Here we have a page fault that hash_page can't handle. */
1238 _GLOBAL(handle_page_fault)
1242 addi r3,r1,STACK_FRAME_OVERHEAD
1245 beq+ .ret_from_except_lite
1248 addi r3,r1,STACK_FRAME_OVERHEAD
1253 /* We have a page fault that hash_page could handle but HV refused
1257 addi r3,r1,STACK_FRAME_OVERHEAD
1262 /* here we have a segment miss */
1263 _GLOBAL(do_ste_alloc)
1264 bl .ste_allocate /* try to insert stab entry */
1266 beq+ fast_exception_return
1267 b .handle_page_fault
1270 * r13 points to the PACA, r9 contains the saved CR,
1271 * r11 and r12 contain the saved SRR0 and SRR1.
1272 * r9 - r13 are saved in paca->exslb.
1273 * We assume we aren't going to take any exceptions during this procedure.
1274 * We assume (DAR >> 60) == 0xc.
1277 _GLOBAL(do_stab_bolted)
1278 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1279 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1281 /* Hash to the primary group */
1282 ld r10,PACASTABVIRT(r13)
1285 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1287 /* Calculate VSID */
1288 /* This is a kernel address, so protovsid = ESID */
1289 ASM_VSID_SCRAMBLE(r11, r9)
1290 rldic r9,r11,12,16 /* r9 = vsid << 12 */
1292 /* Search the primary group for a free entry */
1293 1: ld r11,0(r10) /* Test valid bit of the current ste */
1300 /* Stick for only searching the primary group for now. */
1301 /* At least for now, we use a very simple random castout scheme */
1302 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1304 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1307 /* r10 currently points to an ste one past the group of interest */
1308 /* make it point to the randomly selected entry */
1310 or r10,r10,r11 /* r10 is the entry to invalidate */
1312 isync /* mark the entry invalid */
1314 rldicl r11,r11,56,1 /* clear the valid bit */
1319 clrrdi r11,r11,28 /* Get the esid part of the ste */
1322 2: std r9,8(r10) /* Store the vsid part of the ste */
1325 mfspr r11,SPRN_DAR /* Get the new esid */
1326 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1327 ori r11,r11,0x90 /* Turn on valid and kp */
1328 std r11,0(r10) /* Put new entry back into the stab */
1332 /* All done -- return from exception. */
1333 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1334 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1336 andi. r10,r12,MSR_RI
1339 mtcrf 0x80,r9 /* restore CR */
1347 ld r9,PACA_EXSLB+EX_R9(r13)
1348 ld r10,PACA_EXSLB+EX_R10(r13)
1349 ld r11,PACA_EXSLB+EX_R11(r13)
1350 ld r12,PACA_EXSLB+EX_R12(r13)
1351 ld r13,PACA_EXSLB+EX_R13(r13)
1353 b . /* prevent speculative execution */
1356 * Space for CPU0's segment table.
1358 * On iSeries, the hypervisor must fill in at least one entry before
1359 * we get control (with relocate on). The address is give to the hv
1360 * as a page number (see xLparMap in lpardata.c), so this must be at a
1361 * fixed address (the linker can't compute (u64)&initial_stab >>
1364 . = STAB0_OFFSET /* 0x6000 */
1370 * Data area reserved for FWNMI option.
1371 * This address (0x7000) is fixed by the RPA.
1374 .globl fwnmi_data_area
1377 /* iSeries does not use the FWNMI stuff, so it is safe to put
1378 * this here, even if we later allow kernels that will boot on
1379 * both pSeries and iSeries */
1380 #ifdef CONFIG_PPC_ISERIES
1382 #include "lparmap.s"
1384 * This ".text" is here for old compilers that generate a trailing
1385 * .note section when compiling .c files to .s
1388 #endif /* CONFIG_PPC_ISERIES */
1393 * On pSeries, secondary processors spin in the following code.
1394 * At entry, r3 = this processor's number (physical cpu id)
1396 _GLOBAL(pSeries_secondary_smp_init)
1399 /* turn on 64-bit mode */
1403 /* Copy some CPU settings from CPU 0 */
1404 bl .__restore_cpu_setup
1406 /* Set up a paca value for this processor. Since we have the
1407 * physical cpu id in r24, we need to search the pacas to find
1408 * which logical id maps to our physical one.
1410 LOAD_REG_IMMEDIATE(r13, paca) /* Get base vaddr of paca array */
1411 li r5,0 /* logical cpu id */
1412 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */
1413 cmpw r6,r24 /* Compare to our id */
1415 addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */
1420 mr r3,r24 /* not found, copy phys to r3 */
1421 b .kexec_wait /* next kernel might do better */
1423 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1424 /* From now on, r24 is expected to be logical cpuid */
1427 lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
1431 /* Create a temp kernel stack for use before relocation is on. */
1432 ld r1,PACAEMERGSP(r13)
1433 subi r1,r1,STACK_FRAME_OVERHEAD
1437 bne .__secondary_start
1439 b 3b /* Loop until told to go */
1441 #ifdef CONFIG_PPC_ISERIES
1442 _STATIC(__start_initialization_iSeries)
1443 /* Clear out the BSS */
1444 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1445 LOAD_REG_IMMEDIATE(r8,__bss_start)
1446 sub r11,r11,r8 /* bss size */
1447 addi r11,r11,7 /* round up to an even double word */
1448 rldicl. r11,r11,61,3 /* shift right by 3 */
1452 mtctr r11 /* zero this many doublewords */
1456 LOAD_REG_IMMEDIATE(r1,init_thread_union)
1457 addi r1,r1,THREAD_SIZE
1459 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1461 LOAD_REG_IMMEDIATE(r3,cpu_specs)
1462 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1466 LOAD_REG_IMMEDIATE(r2,__toc_start)
1470 bl .iSeries_early_setup
1473 /* relocation is on at this point */
1475 b .start_here_common
1476 #endif /* CONFIG_PPC_ISERIES */
1478 #ifdef CONFIG_PPC_MULTIPLATFORM
1482 andi. r0,r3,MSR_IR|MSR_DR
1489 b . /* prevent speculative execution */
1493 * Here is our main kernel entry point. We support currently 2 kind of entries
1494 * depending on the value of r5.
1496 * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
1499 * r5 == NULL -> kexec style entry. r3 is a physical pointer to the
1500 * DT block, r4 is a physical pointer to the kernel itself
1503 _GLOBAL(__start_initialization_multiplatform)
1504 #ifdef CONFIG_PPC_MULTIPLATFORM
1506 * Are we booted from a PROM Of-type client-interface ?
1509 bne .__boot_from_prom /* yes -> prom */
1512 /* Save parameters */
1516 /* Make sure we are running in 64 bits mode */
1519 /* Setup some critical 970 SPRs before switching MMU off */
1520 bl .__970_cpu_preinit
1525 /* Switch off MMU if not already */
1526 LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
1529 b .__after_prom_start
1531 #ifdef CONFIG_PPC_MULTIPLATFORM
1532 _STATIC(__boot_from_prom)
1533 /* Save parameters */
1540 /* Make sure we are running in 64 bits mode */
1543 /* put a relocation offset into r3 */
1546 LOAD_REG_IMMEDIATE(r2,__toc_start)
1550 /* Relocate the TOC from a virt addr to a real addr */
1553 /* Restore parameters */
1560 /* Do all of the interaction with OF client interface */
1562 /* We never return */
1567 * At this point, r3 contains the physical address we are running at,
1568 * returned by prom_init()
1570 _STATIC(__after_prom_start)
1573 * We need to run with __start at physical address PHYSICAL_START.
1574 * This will leave some code in the first 256B of
1575 * real memory, which are reserved for software use.
1576 * The remainder of the first page is loaded with the fixed
1577 * interrupt vectors. The next two pages are filled with
1578 * unknown exception placeholders.
1580 * Note: This process overwrites the OF exception vectors.
1581 * r26 == relocation offset
1586 LOAD_REG_IMMEDIATE(r27, KERNELBASE)
1588 LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */
1590 // XXX FIXME: Use phys returned by OF (r30)
1591 add r4,r27,r26 /* source addr */
1592 /* current address of _start */
1593 /* i.e. where we are running */
1594 /* the source addr */
1596 LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
1599 li r6,0x100 /* Start offset, the first 0x100 */
1600 /* bytes were copied earlier. */
1602 bl .copy_and_flush /* copy the first n bytes */
1603 /* this includes the code being */
1604 /* executed here. */
1606 LOAD_REG_IMMEDIATE(r0, 4f) /* Jump to the copy of this code */
1607 mtctr r0 /* that we just made/relocated */
1610 4: LOAD_REG_IMMEDIATE(r5,klimit)
1612 ld r5,0(r5) /* get the value of klimit */
1614 bl .copy_and_flush /* copy the rest */
1615 b .start_here_multiplatform
1617 #endif /* CONFIG_PPC_MULTIPLATFORM */
1620 * Copy routine used to copy the kernel to start at physical address 0
1621 * and flush and invalidate the caches as needed.
1622 * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
1623 * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
1625 * Note: this routine *only* clobbers r0, r6 and lr
1627 _GLOBAL(copy_and_flush)
1630 4: li r0,16 /* Use the least common */
1631 /* denominator cache line */
1632 /* size. This results in */
1633 /* extra cache line flushes */
1634 /* but operation is correct. */
1635 /* Can't get cache line size */
1636 /* from NACA as it is being */
1639 mtctr r0 /* put # words/line in ctr */
1640 3: addi r6,r6,8 /* copy a cache line */
1644 dcbst r6,r3 /* write it to memory */
1646 icbi r6,r3 /* flush the icache line */
1658 #ifdef CONFIG_PPC_PMAC
1660 * On PowerMac, secondary processors starts from the reset vector, which
1661 * is temporarily turned into a call to one of the functions below.
1666 .globl __secondary_start_pmac_0
1667 __secondary_start_pmac_0:
1668 /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
1678 _GLOBAL(pmac_secondary_start)
1679 /* turn on 64-bit mode */
1683 /* Copy some CPU settings from CPU 0 */
1684 bl .__restore_cpu_setup
1686 /* pSeries do that early though I don't think we really need it */
1689 mtmsrd r3 /* RI on */
1691 /* Set up a paca value for this processor. */
1692 LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */
1693 mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */
1694 add r13,r13,r4 /* for this processor. */
1695 mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1697 /* Create a temp kernel stack for use before relocation is on. */
1698 ld r1,PACAEMERGSP(r13)
1699 subi r1,r1,STACK_FRAME_OVERHEAD
1701 b .__secondary_start
1703 #endif /* CONFIG_PPC_PMAC */
1706 * This function is called after the master CPU has released the
1707 * secondary processors. The execution environment is relocation off.
1708 * The paca for this processor has the following fields initialized at
1710 * 1. Processor number
1711 * 2. Segment table pointer (virtual address)
1712 * On entry the following are set:
1713 * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries
1714 * r24 = cpu# (in Linux terms)
1715 * r13 = paca virtual address
1716 * SPRG3 = paca virtual address
1718 _GLOBAL(__secondary_start)
1719 /* Set thread priority to MEDIUM */
1725 /* Do early setup for that CPU (stab, slb, hash table pointer) */
1726 bl .early_setup_secondary
1728 /* Initialize the kernel stack. Just a repeat for iSeries. */
1729 LOAD_REG_ADDR(r3, current_set)
1730 sldi r28,r24,3 /* get current_set[cpu#] */
1732 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1733 std r1,PACAKSAVE(r13)
1735 /* Clear backchain so we get nice backtraces */
1739 /* enable MMU and jump to start_secondary */
1740 LOAD_REG_ADDR(r3, .start_secondary_prolog)
1741 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1742 #ifdef DO_SOFT_DISABLE
1748 b . /* prevent speculative execution */
1751 * Running with relocation on at this point. All we want to do is
1752 * zero the stack back-chain pointer before going into C code.
1754 _GLOBAL(start_secondary_prolog)
1756 std r3,0(r1) /* Zero the stack frame pointer */
1762 * This subroutine clobbers r11 and r12
1764 _GLOBAL(enable_64b_mode)
1765 mfmsr r11 /* grab the current MSR */
1767 rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1770 rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1776 #ifdef CONFIG_PPC_MULTIPLATFORM
1778 * This is where the main kernel code starts.
1780 _STATIC(start_here_multiplatform)
1781 /* get a new offset, now that the kernel has moved. */
1785 /* Clear out the BSS. It may have been done in prom_init,
1786 * already but that's irrelevant since prom_init will soon
1787 * be detached from the kernel completely. Besides, we need
1788 * to clear it now for kexec-style entry.
1790 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1791 LOAD_REG_IMMEDIATE(r8,__bss_start)
1792 sub r11,r11,r8 /* bss size */
1793 addi r11,r11,7 /* round up to an even double word */
1794 rldicl. r11,r11,61,3 /* shift right by 3 */
1798 mtctr r11 /* zero this many doublewords */
1805 mtmsrd r6 /* RI on */
1807 /* The following gets the stack and TOC set up with the regs */
1808 /* pointing to the real addr of the kernel stack. This is */
1809 /* all done to support the C function call below which sets */
1810 /* up the htab. This is done because we have relocated the */
1811 /* kernel but are still running in real mode. */
1813 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1816 /* set up a stack pointer (physical address) */
1817 addi r1,r3,THREAD_SIZE
1819 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1821 /* set up the TOC (physical address) */
1822 LOAD_REG_IMMEDIATE(r2,__toc_start)
1827 LOAD_REG_IMMEDIATE(r3, cpu_specs)
1829 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1834 /* Save some low level config HIDs of CPU0 to be copied to
1835 * other CPUs later on, or used for suspend/resume
1837 bl .__save_cpu_setup
1840 /* Setup a valid physical PACA pointer in SPRG3 for early_setup
1841 * note that boot_cpuid can always be 0 nowadays since there is
1842 * nowhere it can be initialized differently before we reach this
1845 LOAD_REG_IMMEDIATE(r27, boot_cpuid)
1849 LOAD_REG_IMMEDIATE(r24, paca) /* Get base vaddr of paca array */
1850 mulli r13,r27,PACA_SIZE /* Calculate vaddr of right paca */
1851 add r13,r13,r24 /* for this processor. */
1852 add r13,r13,r26 /* convert to physical addr */
1853 mtspr SPRN_SPRG3,r13
1855 /* Do very early kernel initializations, including initial hash table,
1856 * stab and slb setup before we turn on relocation. */
1858 /* Restore parameters passed from prom_init/kexec */
1862 LOAD_REG_IMMEDIATE(r3, .start_here_common)
1863 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1867 b . /* prevent speculative execution */
1868 #endif /* CONFIG_PPC_MULTIPLATFORM */
1870 /* This is where all platforms converge execution */
1871 _STATIC(start_here_common)
1872 /* relocation is on at this point */
1874 /* The following code sets up the SP and TOC now that we are */
1875 /* running with translation enabled. */
1877 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1879 /* set up the stack */
1880 addi r1,r3,THREAD_SIZE
1882 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1884 /* Apply the CPUs-specific fixups (nop out sections not relevant
1888 bl .do_cpu_ftr_fixups
1890 LOAD_REG_IMMEDIATE(r26, boot_cpuid)
1893 LOAD_REG_IMMEDIATE(r24, paca) /* Get base vaddr of paca array */
1894 mulli r13,r26,PACA_SIZE /* Calculate vaddr of right paca */
1895 add r13,r13,r24 /* for this processor. */
1896 mtspr SPRN_SPRG3,r13
1898 /* ptr to current */
1899 LOAD_REG_IMMEDIATE(r4, init_task)
1900 std r4,PACACURRENT(r13)
1904 std r1,PACAKSAVE(r13)
1908 /* Load up the kernel context */
1910 #ifdef DO_SOFT_DISABLE
1912 stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
1914 ori r5,r5,MSR_EE /* Hard Enabled */
1924 * We put a few things here that have to be page-aligned.
1925 * This stuff goes at the beginning of the bss, which is page-aligned.
1931 .globl empty_zero_page
1935 .globl swapper_pg_dir
1940 * This space gets a copy of optional info passed to us by the bootstrap
1941 * Used to pass parameters into the kernel like root=/dev/sda1, etc.
1945 .space COMMAND_LINE_SIZE