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 linux 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)
157 SET_REG_IMMEDIATE(r4, .hmt_init)
162 LOAD_REG_IMMEDIATE(r4, .pSeries_secondary_smp_init)
171 /* This value is used to mark exception frames on the stack. */
174 .tc ID_72656773_68657265[TC],0x7265677368657265
178 * The following macros define the code that appears as
179 * the prologue to each of the exception handlers. They
180 * are split into two parts to allow a single kernel binary
181 * to be used for pSeries and iSeries.
182 * LOL. One day... - paulus
186 * We make as much of the exception code common between native
187 * exception handlers (including pSeries LPAR) and iSeries LPAR
188 * implementations as possible.
192 * This is the start of the interrupt handlers for pSeries
193 * This code runs with relocation off.
208 * We're short on space and time in the exception prolog, so we can't
209 * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
210 * low halfword of the address, but for Kdump we need the whole low
213 #ifdef CONFIG_CRASH_DUMP
214 #define LOAD_HANDLER(reg, label) \
215 oris reg,reg,(label)@h; /* virt addr of handler ... */ \
216 ori reg,reg,(label)@l; /* .. and the rest */
218 #define LOAD_HANDLER(reg, label) \
219 ori reg,reg,(label)@l; /* virt addr of handler ... */
222 #define EXCEPTION_PROLOG_PSERIES(area, label) \
223 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
224 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
225 std r10,area+EX_R10(r13); \
226 std r11,area+EX_R11(r13); \
227 std r12,area+EX_R12(r13); \
228 mfspr r9,SPRN_SPRG1; \
229 std r9,area+EX_R13(r13); \
231 clrrdi r12,r13,32; /* get high part of &label */ \
233 mfspr r11,SPRN_SRR0; /* save SRR0 */ \
234 LOAD_HANDLER(r12,label) \
235 ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \
236 mtspr SPRN_SRR0,r12; \
237 mfspr r12,SPRN_SRR1; /* and SRR1 */ \
238 mtspr SPRN_SRR1,r10; \
240 b . /* prevent speculative execution */
243 * This is the start of the interrupt handlers for iSeries
244 * This code runs with relocation on.
246 #define EXCEPTION_PROLOG_ISERIES_1(area) \
247 mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
248 std r9,area+EX_R9(r13); /* save r9 - r12 */ \
249 std r10,area+EX_R10(r13); \
250 std r11,area+EX_R11(r13); \
251 std r12,area+EX_R12(r13); \
252 mfspr r9,SPRN_SPRG1; \
253 std r9,area+EX_R13(r13); \
256 #define EXCEPTION_PROLOG_ISERIES_2 \
258 ld r12,PACALPPACAPTR(r13); \
259 ld r11,LPPACASRR0(r12); \
260 ld r12,LPPACASRR1(r12); \
261 ori r10,r10,MSR_RI; \
265 * The common exception prolog is used for all except a few exceptions
266 * such as a segment miss on a kernel address. We have to be prepared
267 * to take another exception from the point where we first touch the
268 * kernel stack onwards.
270 * On entry r13 points to the paca, r9-r13 are saved in the paca,
271 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
272 * SRR1, and relocation is on.
274 #define EXCEPTION_PROLOG_COMMON(n, area) \
275 andi. r10,r12,MSR_PR; /* See if coming from user */ \
276 mr r10,r1; /* Save r1 */ \
277 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
279 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
280 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \
281 bge- cr1,bad_stack; /* abort if it is */ \
282 std r9,_CCR(r1); /* save CR in stackframe */ \
283 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
284 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
285 std r10,0(r1); /* make stack chain pointer */ \
286 std r0,GPR0(r1); /* save r0 in stackframe */ \
287 std r10,GPR1(r1); /* save r1 in stackframe */ \
288 std r2,GPR2(r1); /* save r2 in stackframe */ \
289 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
290 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
291 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
292 ld r10,area+EX_R10(r13); \
295 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
296 ld r10,area+EX_R12(r13); \
297 ld r11,area+EX_R13(r13); \
301 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
302 mflr r9; /* save LR in stackframe */ \
304 mfctr r10; /* save CTR in stackframe */ \
306 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
309 std r9,_TRAP(r1); /* set trap number */ \
311 ld r11,exception_marker@toc(r2); \
312 std r10,RESULT(r1); /* clear regs->result */ \
313 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
318 #define STD_EXCEPTION_PSERIES(n, label) \
320 .globl label##_pSeries; \
323 mtspr SPRN_SPRG1,r13; /* save r13 */ \
325 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
327 #define STD_EXCEPTION_ISERIES(n, label, area) \
328 .globl label##_iSeries; \
331 mtspr SPRN_SPRG1,r13; /* save r13 */ \
333 EXCEPTION_PROLOG_ISERIES_1(area); \
334 EXCEPTION_PROLOG_ISERIES_2; \
337 #define MASKABLE_EXCEPTION_ISERIES(n, label) \
338 .globl label##_iSeries; \
341 mtspr SPRN_SPRG1,r13; /* save r13 */ \
343 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
344 lbz r10,PACAPROCENABLED(r13); \
346 beq- label##_iSeries_masked; \
347 EXCEPTION_PROLOG_ISERIES_2; \
350 #ifdef DO_SOFT_DISABLE
351 #define DISABLE_INTS \
352 lbz r10,PACAPROCENABLED(r13); \
356 stb r11,PACAPROCENABLED(r13); \
357 ori r10,r10,MSR_EE; \
360 #define ENABLE_INTS \
361 lbz r10,PACAPROCENABLED(r13); \
364 ori r11,r11,MSR_EE; \
367 #else /* hard enable/disable interrupts */
370 #define ENABLE_INTS \
373 rlwimi r11,r12,0,MSR_EE; \
378 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
380 .globl label##_common; \
382 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
385 addi r3,r1,STACK_FRAME_OVERHEAD; \
389 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \
391 .globl label##_common; \
393 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
395 addi r3,r1,STACK_FRAME_OVERHEAD; \
397 b .ret_from_except_lite
400 * Start of pSeries system interrupt routines
403 .globl __start_interrupts
406 STD_EXCEPTION_PSERIES(0x100, system_reset)
409 _machine_check_pSeries:
411 mtspr SPRN_SPRG1,r13 /* save r13 */
413 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
416 .globl data_access_pSeries
425 rlwimi r13,r12,16,0x20
428 beq .do_stab_bolted_pSeries
431 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
432 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
435 .globl data_access_slb_pSeries
436 data_access_slb_pSeries:
440 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
441 std r3,PACA_EXSLB+EX_R3(r13)
443 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
446 /* Keep that around for when we re-implement dynamic VSIDs */
448 bge slb_miss_user_pseries
449 #endif /* __DISABLED__ */
450 std r10,PACA_EXSLB+EX_R10(r13)
451 std r11,PACA_EXSLB+EX_R11(r13)
452 std r12,PACA_EXSLB+EX_R12(r13)
454 std r10,PACA_EXSLB+EX_R13(r13)
455 mfspr r12,SPRN_SRR1 /* and SRR1 */
456 b .slb_miss_realmode /* Rel. branch works in real mode */
458 STD_EXCEPTION_PSERIES(0x400, instruction_access)
461 .globl instruction_access_slb_pSeries
462 instruction_access_slb_pSeries:
466 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
467 std r3,PACA_EXSLB+EX_R3(r13)
468 mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
469 std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
472 /* Keep that around for when we re-implement dynamic VSIDs */
474 bge slb_miss_user_pseries
475 #endif /* __DISABLED__ */
476 std r10,PACA_EXSLB+EX_R10(r13)
477 std r11,PACA_EXSLB+EX_R11(r13)
478 std r12,PACA_EXSLB+EX_R12(r13)
480 std r10,PACA_EXSLB+EX_R13(r13)
481 mfspr r12,SPRN_SRR1 /* and SRR1 */
482 b .slb_miss_realmode /* Rel. branch works in real mode */
484 STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
485 STD_EXCEPTION_PSERIES(0x600, alignment)
486 STD_EXCEPTION_PSERIES(0x700, program_check)
487 STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
488 STD_EXCEPTION_PSERIES(0x900, decrementer)
489 STD_EXCEPTION_PSERIES(0xa00, trap_0a)
490 STD_EXCEPTION_PSERIES(0xb00, trap_0b)
493 .globl system_call_pSeries
502 oris r12,r12,system_call_common@h
503 ori r12,r12,system_call_common@l
505 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
509 b . /* prevent speculative execution */
511 STD_EXCEPTION_PSERIES(0xd00, single_step)
512 STD_EXCEPTION_PSERIES(0xe00, trap_0e)
514 /* We need to deal with the Altivec unavailable exception
515 * here which is at 0xf20, thus in the middle of the
516 * prolog code of the PerformanceMonitor one. A little
517 * trickery is thus necessary
520 b performance_monitor_pSeries
522 STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable)
524 STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
525 STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
529 /*** pSeries interrupt support ***/
531 /* moved from 0xf00 */
532 STD_EXCEPTION_PSERIES(., performance_monitor)
535 _GLOBAL(do_stab_bolted_pSeries)
538 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
541 * We have some room here we use that to put
542 * the peries slb miss user trampoline code so it's reasonably
543 * away from slb_miss_user_common to avoid problems with rfid
545 * This is used for when the SLB miss handler has to go virtual,
546 * which doesn't happen for now anymore but will once we re-implement
547 * dynamic VSIDs for shared page tables
550 slb_miss_user_pseries:
551 std r10,PACA_EXGEN+EX_R10(r13)
552 std r11,PACA_EXGEN+EX_R11(r13)
553 std r12,PACA_EXGEN+EX_R12(r13)
555 ld r11,PACA_EXSLB+EX_R9(r13)
556 ld r12,PACA_EXSLB+EX_R3(r13)
557 std r10,PACA_EXGEN+EX_R13(r13)
558 std r11,PACA_EXGEN+EX_R9(r13)
559 std r12,PACA_EXGEN+EX_R3(r13)
562 mfspr r11,SRR0 /* save SRR0 */
563 ori r12,r12,slb_miss_user_common@l /* virt addr of handler */
564 ori r10,r10,MSR_IR|MSR_DR|MSR_RI
566 mfspr r12,SRR1 /* and SRR1 */
569 b . /* prevent spec. execution */
570 #endif /* __DISABLED__ */
573 * Vectors for the FWNMI option. Share common code.
575 .globl system_reset_fwnmi
579 mtspr SPRN_SPRG1,r13 /* save r13 */
581 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
583 .globl machine_check_fwnmi
587 mtspr SPRN_SPRG1,r13 /* save r13 */
589 EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
591 #ifdef CONFIG_PPC_ISERIES
592 /*** ISeries-LPAR interrupt handlers ***/
594 STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC)
596 .globl data_access_iSeries
604 rlwimi r13,r12,16,0x20
607 beq .do_stab_bolted_iSeries
610 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
611 EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN)
612 EXCEPTION_PROLOG_ISERIES_2
615 .do_stab_bolted_iSeries:
618 EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
619 EXCEPTION_PROLOG_ISERIES_2
622 .globl data_access_slb_iSeries
623 data_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)
628 std r9,PACA_EXSLB+EX_R9(r13)
632 bge slb_miss_user_iseries
634 std r10,PACA_EXSLB+EX_R10(r13)
635 std r11,PACA_EXSLB+EX_R11(r13)
636 std r12,PACA_EXSLB+EX_R12(r13)
638 std r10,PACA_EXSLB+EX_R13(r13)
639 ld r12,PACALPPACAPTR(r13)
640 ld r12,LPPACASRR1(r12)
643 STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
645 .globl instruction_access_slb_iSeries
646 instruction_access_slb_iSeries:
647 mtspr SPRN_SPRG1,r13 /* save r13 */
648 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */
649 std r3,PACA_EXSLB+EX_R3(r13)
650 ld r3,PACALPPACAPTR(r13)
651 ld r3,LPPACASRR0(r3) /* get SRR0 value */
652 std r9,PACA_EXSLB+EX_R9(r13)
656 bge .slb_miss_user_iseries
658 std r10,PACA_EXSLB+EX_R10(r13)
659 std r11,PACA_EXSLB+EX_R11(r13)
660 std r12,PACA_EXSLB+EX_R12(r13)
662 std r10,PACA_EXSLB+EX_R13(r13)
663 ld r12,PACALPPACAPTR(r13)
664 ld r12,LPPACASRR1(r12)
668 slb_miss_user_iseries:
669 std r10,PACA_EXGEN+EX_R10(r13)
670 std r11,PACA_EXGEN+EX_R11(r13)
671 std r12,PACA_EXGEN+EX_R12(r13)
673 ld r11,PACA_EXSLB+EX_R9(r13)
674 ld r12,PACA_EXSLB+EX_R3(r13)
675 std r10,PACA_EXGEN+EX_R13(r13)
676 std r11,PACA_EXGEN+EX_R9(r13)
677 std r12,PACA_EXGEN+EX_R3(r13)
678 EXCEPTION_PROLOG_ISERIES_2
679 b slb_miss_user_common
682 MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
683 STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
684 STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN)
685 STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN)
686 MASKABLE_EXCEPTION_ISERIES(0x900, decrementer)
687 STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN)
688 STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN)
690 .globl system_call_iSeries
694 EXCEPTION_PROLOG_ISERIES_2
697 STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN)
698 STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN)
699 STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN)
701 .globl system_reset_iSeries
702 system_reset_iSeries:
703 mfspr r13,SPRN_SPRG3 /* Get paca address */
706 mtmsrd r24 /* RI on */
707 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
708 cmpwi 0,r24,0 /* Are we processor 0? */
709 beq .__start_initialization_iSeries /* Start up the first processor */
711 li r5,CTRL_RUNLATCH /* Turn off the run light */
718 lbz r23,PACAPROCSTART(r13) /* Test if this processor
721 LOAD_REG_IMMEDIATE(r3,current_set)
722 sldi r28,r24,3 /* get current_set[cpu#] */
724 addi r1,r3,THREAD_SIZE
725 subi r1,r1,STACK_FRAME_OVERHEAD
728 beq iSeries_secondary_smp_loop /* Loop until told to go */
729 bne .__secondary_start /* Loop until told to go */
730 iSeries_secondary_smp_loop:
731 /* Let the Hypervisor know we are alive */
732 /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
734 rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
735 #else /* CONFIG_SMP */
736 /* Yield the processor. This is required for non-SMP kernels
737 which are running on multi-threaded machines. */
739 rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
740 addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
741 li r4,0 /* "yield timed" */
742 li r5,-1 /* "yield forever" */
743 #endif /* CONFIG_SMP */
744 li r0,-1 /* r0=-1 indicates a Hypervisor call */
745 sc /* Invoke the hypervisor via a system call */
746 mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
747 b 1b /* If SMP not configured, secondaries
750 .globl decrementer_iSeries_masked
751 decrementer_iSeries_masked:
752 /* We may not have a valid TOC pointer in here. */
754 ld r12,PACALPPACAPTR(r13)
755 stb r11,LPPACADECRINT(r12)
756 LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy)
761 .globl hardware_interrupt_iSeries_masked
762 hardware_interrupt_iSeries_masked:
763 mtcrf 0x80,r9 /* Restore regs */
764 ld r12,PACALPPACAPTR(r13)
765 ld r11,LPPACASRR0(r12)
766 ld r12,LPPACASRR1(r12)
769 ld r9,PACA_EXGEN+EX_R9(r13)
770 ld r10,PACA_EXGEN+EX_R10(r13)
771 ld r11,PACA_EXGEN+EX_R11(r13)
772 ld r12,PACA_EXGEN+EX_R12(r13)
773 ld r13,PACA_EXGEN+EX_R13(r13)
775 b . /* prevent speculative execution */
776 #endif /* CONFIG_PPC_ISERIES */
778 /*** Common interrupt handlers ***/
780 STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception)
783 * Machine check is different because we use a different
784 * save area: PACA_EXMC instead of PACA_EXGEN.
787 .globl machine_check_common
788 machine_check_common:
789 EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
792 addi r3,r1,STACK_FRAME_OVERHEAD
793 bl .machine_check_exception
796 STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt)
797 STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
798 STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
799 STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
800 STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
801 STD_EXCEPTION_COMMON(0xf00, performance_monitor, .performance_monitor_exception)
802 STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
803 #ifdef CONFIG_ALTIVEC
804 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
806 STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception)
810 * Here we have detected that the kernel stack pointer is bad.
811 * R9 contains the saved CR, r13 points to the paca,
812 * r10 contains the (bad) kernel stack pointer,
813 * r11 and r12 contain the saved SRR0 and SRR1.
814 * We switch to using an emergency stack, save the registers there,
815 * and call kernel_bad_stack(), which panics.
818 ld r1,PACAEMERGSP(r13)
819 subi r1,r1,64+INT_FRAME_SIZE
840 addi r11,r1,INT_FRAME_SIZE
845 1: addi r3,r1,STACK_FRAME_OVERHEAD
850 * Return from an exception with minimal checks.
851 * The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
852 * If interrupts have been enabled, or anything has been
853 * done that might have changed the scheduling status of
854 * any task or sent any task a signal, you should use
855 * ret_from_except or ret_from_except_lite instead of this.
857 .globl fast_exception_return
858 fast_exception_return:
861 andi. r3,r12,MSR_RI /* check if RI is set */
875 clrrdi r10,r10,2 /* clear RI (LE is 0 already) */
883 b . /* prevent speculative execution */
887 1: addi r3,r1,STACK_FRAME_OVERHEAD
888 bl .unrecoverable_exception
892 * Here r13 points to the paca, r9 contains the saved CR,
893 * SRR0 and SRR1 are saved in r11 and r12,
894 * r9 - r13 are saved in paca->exgen.
897 .globl data_access_common
899 RUNLATCH_ON(r10) /* It wont fit in the 0x300 handler */
901 std r10,PACA_EXGEN+EX_DAR(r13)
903 stw r10,PACA_EXGEN+EX_DSISR(r13)
904 EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
905 ld r3,PACA_EXGEN+EX_DAR(r13)
906 lwz r4,PACA_EXGEN+EX_DSISR(r13)
908 b .do_hash_page /* Try to handle as hpte fault */
911 .globl instruction_access_common
912 instruction_access_common:
913 EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
917 b .do_hash_page /* Try to handle as hpte fault */
920 * Here is the common SLB miss user that is used when going to virtual
921 * mode for SLB misses, that is currently not used
925 .globl slb_miss_user_common
926 slb_miss_user_common:
928 std r3,PACA_EXGEN+EX_DAR(r13)
929 stw r9,PACA_EXGEN+EX_CCR(r13)
930 std r10,PACA_EXGEN+EX_LR(r13)
931 std r11,PACA_EXGEN+EX_SRR0(r13)
932 bl .slb_allocate_user
934 ld r10,PACA_EXGEN+EX_LR(r13)
935 ld r3,PACA_EXGEN+EX_R3(r13)
936 lwz r9,PACA_EXGEN+EX_CCR(r13)
937 ld r11,PACA_EXGEN+EX_SRR0(r13)
941 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
942 beq- unrecov_user_slb
950 clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */
956 ld r9,PACA_EXGEN+EX_R9(r13)
957 ld r10,PACA_EXGEN+EX_R10(r13)
958 ld r11,PACA_EXGEN+EX_R11(r13)
959 ld r12,PACA_EXGEN+EX_R12(r13)
960 ld r13,PACA_EXGEN+EX_R13(r13)
965 EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
966 ld r4,PACA_EXGEN+EX_DAR(r13)
973 EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
976 1: addi r3,r1,STACK_FRAME_OVERHEAD
977 bl .unrecoverable_exception
980 #endif /* __DISABLED__ */
984 * r13 points to the PACA, r9 contains the saved CR,
985 * r12 contain the saved SRR1, SRR0 is still ready for return
986 * r3 has the faulting address
987 * r9 - r13 are saved in paca->exslb.
988 * r3 is saved in paca->slb_r3
989 * We assume we aren't going to take any exceptions during this procedure.
991 _GLOBAL(slb_miss_realmode)
994 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
995 std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
997 bl .slb_allocate_realmode
999 /* All done -- return from exception. */
1001 ld r10,PACA_EXSLB+EX_LR(r13)
1002 ld r3,PACA_EXSLB+EX_R3(r13)
1003 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1004 #ifdef CONFIG_PPC_ISERIES
1005 ld r11,PACALPPACAPTR(r13)
1006 ld r11,LPPACASRR0(r11) /* get SRR0 value */
1007 #endif /* CONFIG_PPC_ISERIES */
1011 andi. r10,r12,MSR_RI /* check for unrecoverable exception */
1017 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
1020 #ifdef CONFIG_PPC_ISERIES
1023 #endif /* CONFIG_PPC_ISERIES */
1024 ld r9,PACA_EXSLB+EX_R9(r13)
1025 ld r10,PACA_EXSLB+EX_R10(r13)
1026 ld r11,PACA_EXSLB+EX_R11(r13)
1027 ld r12,PACA_EXSLB+EX_R12(r13)
1028 ld r13,PACA_EXSLB+EX_R13(r13)
1030 b . /* prevent speculative execution */
1033 EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
1036 1: addi r3,r1,STACK_FRAME_OVERHEAD
1037 bl .unrecoverable_exception
1041 .globl hardware_interrupt_common
1042 .globl hardware_interrupt_entry
1043 hardware_interrupt_common:
1044 EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
1045 hardware_interrupt_entry:
1047 addi r3,r1,STACK_FRAME_OVERHEAD
1049 b .ret_from_except_lite
1052 .globl alignment_common
1055 std r10,PACA_EXGEN+EX_DAR(r13)
1056 mfspr r10,SPRN_DSISR
1057 stw r10,PACA_EXGEN+EX_DSISR(r13)
1058 EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
1059 ld r3,PACA_EXGEN+EX_DAR(r13)
1060 lwz r4,PACA_EXGEN+EX_DSISR(r13)
1064 addi r3,r1,STACK_FRAME_OVERHEAD
1066 bl .alignment_exception
1070 .globl program_check_common
1071 program_check_common:
1072 EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
1074 addi r3,r1,STACK_FRAME_OVERHEAD
1076 bl .program_check_exception
1080 .globl fp_unavailable_common
1081 fp_unavailable_common:
1082 EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
1083 bne .load_up_fpu /* if from user, just load it up */
1085 addi r3,r1,STACK_FRAME_OVERHEAD
1087 bl .kernel_fp_unavailable_exception
1091 .globl altivec_unavailable_common
1092 altivec_unavailable_common:
1093 EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
1094 #ifdef CONFIG_ALTIVEC
1096 bne .load_up_altivec /* if from user, just load it up */
1097 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
1100 addi r3,r1,STACK_FRAME_OVERHEAD
1102 bl .altivec_unavailable_exception
1105 #ifdef CONFIG_ALTIVEC
1107 * load_up_altivec(unused, unused, tsk)
1108 * Disable VMX for the task which had it previously,
1109 * and save its vector registers in its thread_struct.
1110 * Enables the VMX for use in the kernel on return.
1111 * On SMP we know the VMX is free, since we give it up every
1112 * switch (ie, no lazy save of the vector registers).
1113 * On entry: r13 == 'current' && last_task_used_altivec != 'current'
1115 _STATIC(load_up_altivec)
1116 mfmsr r5 /* grab the current MSR */
1117 oris r5,r5,MSR_VEC@h
1118 mtmsrd r5 /* enable use of VMX now */
1122 * For SMP, we don't do lazy VMX switching because it just gets too
1123 * horrendously complex, especially when a task switches from one CPU
1124 * to another. Instead we call giveup_altvec in switch_to.
1125 * VRSAVE isn't dealt with here, that is done in the normal context
1126 * switch code. Note that we could rely on vrsave value to eventually
1127 * avoid saving all of the VREGs here...
1130 ld r3,last_task_used_altivec@got(r2)
1134 /* Save VMX state to last_task_used_altivec's THREAD struct */
1140 /* Disable VMX for last_task_used_altivec */
1142 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1145 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1147 #endif /* CONFIG_SMP */
1148 /* Hack: if we get an altivec unavailable trap with VRSAVE
1149 * set to all zeros, we assume this is a broken application
1150 * that fails to set it properly, and thus we switch it to
1153 mfspr r4,SPRN_VRSAVE
1157 mtspr SPRN_VRSAVE,r4
1159 /* enable use of VMX after return */
1160 ld r4,PACACURRENT(r13)
1161 addi r5,r4,THREAD /* Get THREAD */
1162 oris r12,r12,MSR_VEC@h
1166 stw r4,THREAD_USED_VR(r5)
1171 /* Update last_task_used_math to 'current' */
1172 subi r4,r5,THREAD /* Back to 'current' */
1174 #endif /* CONFIG_SMP */
1175 /* restore registers and return */
1176 b fast_exception_return
1177 #endif /* CONFIG_ALTIVEC */
1183 _GLOBAL(do_hash_page)
1187 andis. r0,r4,0xa450 /* weird error? */
1188 bne- .handle_page_fault /* if not, try to insert a HPTE */
1190 andis. r0,r4,0x0020 /* Is it a segment table fault? */
1191 bne- .do_ste_alloc /* If so handle it */
1192 END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
1195 * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
1196 * accessing a userspace segment (even from the kernel). We assume
1197 * kernel addresses always have the high bit set.
1199 rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */
1200 rotldi r0,r3,15 /* Move high bit into MSR_PR posn */
1201 orc r0,r12,r0 /* MSR_PR | ~high_bit */
1202 rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */
1203 ori r4,r4,1 /* add _PAGE_PRESENT */
1204 rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */
1207 * On iSeries, we soft-disable interrupts here, then
1208 * hard-enable interrupts so that the hash_page code can spin on
1209 * the hash_table_lock without problems on a shared processor.
1214 * r3 contains the faulting address
1215 * r4 contains the required access permissions
1216 * r5 contains the trap number
1218 * at return r3 = 0 for success
1220 bl .hash_page /* build HPTE if possible */
1221 cmpdi r3,0 /* see if hash_page succeeded */
1223 #ifdef DO_SOFT_DISABLE
1225 * If we had interrupts soft-enabled at the point where the
1226 * DSI/ISI occurred, and an interrupt came in during hash_page,
1228 * We jump to ret_from_except_lite rather than fast_exception_return
1229 * because ret_from_except_lite will check for and handle pending
1230 * interrupts if necessary.
1232 beq .ret_from_except_lite
1233 /* For a hash failure, we don't bother re-enabling interrupts */
1237 * hash_page couldn't handle it, set soft interrupt enable back
1238 * to what it was before the trap. Note that .local_irq_restore
1239 * handles any interrupts pending at this point.
1242 bl .local_irq_restore
1245 beq fast_exception_return /* Return from exception on success */
1246 ble- 12f /* Failure return from hash_page */
1251 /* Here we have a page fault that hash_page can't handle. */
1252 _GLOBAL(handle_page_fault)
1256 addi r3,r1,STACK_FRAME_OVERHEAD
1259 beq+ .ret_from_except_lite
1262 addi r3,r1,STACK_FRAME_OVERHEAD
1267 /* We have a page fault that hash_page could handle but HV refused
1271 addi r3,r1,STACK_FRAME_OVERHEAD
1276 /* here we have a segment miss */
1277 _GLOBAL(do_ste_alloc)
1278 bl .ste_allocate /* try to insert stab entry */
1280 beq+ fast_exception_return
1281 b .handle_page_fault
1284 * r13 points to the PACA, r9 contains the saved CR,
1285 * r11 and r12 contain the saved SRR0 and SRR1.
1286 * r9 - r13 are saved in paca->exslb.
1287 * We assume we aren't going to take any exceptions during this procedure.
1288 * We assume (DAR >> 60) == 0xc.
1291 _GLOBAL(do_stab_bolted)
1292 stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
1293 std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */
1295 /* Hash to the primary group */
1296 ld r10,PACASTABVIRT(r13)
1299 rldimi r10,r11,7,52 /* r10 = first ste of the group */
1301 /* Calculate VSID */
1302 /* This is a kernel address, so protovsid = ESID */
1303 ASM_VSID_SCRAMBLE(r11, r9)
1304 rldic r9,r11,12,16 /* r9 = vsid << 12 */
1306 /* Search the primary group for a free entry */
1307 1: ld r11,0(r10) /* Test valid bit of the current ste */
1314 /* Stick for only searching the primary group for now. */
1315 /* At least for now, we use a very simple random castout scheme */
1316 /* Use the TB as a random number ; OR in 1 to avoid entry 0 */
1318 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */
1321 /* r10 currently points to an ste one past the group of interest */
1322 /* make it point to the randomly selected entry */
1324 or r10,r10,r11 /* r10 is the entry to invalidate */
1326 isync /* mark the entry invalid */
1328 rldicl r11,r11,56,1 /* clear the valid bit */
1333 clrrdi r11,r11,28 /* Get the esid part of the ste */
1336 2: std r9,8(r10) /* Store the vsid part of the ste */
1339 mfspr r11,SPRN_DAR /* Get the new esid */
1340 clrrdi r11,r11,28 /* Permits a full 32b of ESID */
1341 ori r11,r11,0x90 /* Turn on valid and kp */
1342 std r11,0(r10) /* Put new entry back into the stab */
1346 /* All done -- return from exception. */
1347 lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
1348 ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */
1350 andi. r10,r12,MSR_RI
1353 mtcrf 0x80,r9 /* restore CR */
1361 ld r9,PACA_EXSLB+EX_R9(r13)
1362 ld r10,PACA_EXSLB+EX_R10(r13)
1363 ld r11,PACA_EXSLB+EX_R11(r13)
1364 ld r12,PACA_EXSLB+EX_R12(r13)
1365 ld r13,PACA_EXSLB+EX_R13(r13)
1367 b . /* prevent speculative execution */
1370 * Space for CPU0's segment table.
1372 * On iSeries, the hypervisor must fill in at least one entry before
1373 * we get control (with relocate on). The address is give to the hv
1374 * as a page number (see xLparMap in lpardata.c), so this must be at a
1375 * fixed address (the linker can't compute (u64)&initial_stab >>
1378 . = STAB0_OFFSET /* 0x6000 */
1384 * Data area reserved for FWNMI option.
1385 * This address (0x7000) is fixed by the RPA.
1388 .globl fwnmi_data_area
1391 /* iSeries does not use the FWNMI stuff, so it is safe to put
1392 * this here, even if we later allow kernels that will boot on
1393 * both pSeries and iSeries */
1394 #ifdef CONFIG_PPC_ISERIES
1396 #include "lparmap.s"
1398 * This ".text" is here for old compilers that generate a trailing
1399 * .note section when compiling .c files to .s
1402 #endif /* CONFIG_PPC_ISERIES */
1407 * On pSeries, secondary processors spin in the following code.
1408 * At entry, r3 = this processor's number (physical cpu id)
1410 _GLOBAL(pSeries_secondary_smp_init)
1413 /* turn on 64-bit mode */
1417 /* Copy some CPU settings from CPU 0 */
1418 bl .__restore_cpu_setup
1420 /* Set up a paca value for this processor. Since we have the
1421 * physical cpu id in r24, we need to search the pacas to find
1422 * which logical id maps to our physical one.
1424 LOAD_REG_IMMEDIATE(r13, paca) /* Get base vaddr of paca array */
1425 li r5,0 /* logical cpu id */
1426 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */
1427 cmpw r6,r24 /* Compare to our id */
1429 addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */
1434 mr r3,r24 /* not found, copy phys to r3 */
1435 b .kexec_wait /* next kernel might do better */
1437 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1438 /* From now on, r24 is expected to be logical cpuid */
1441 lbz r23,PACAPROCSTART(r13) /* Test if this processor should */
1445 /* Create a temp kernel stack for use before relocation is on. */
1446 ld r1,PACAEMERGSP(r13)
1447 subi r1,r1,STACK_FRAME_OVERHEAD
1451 bne .__secondary_start
1453 b 3b /* Loop until told to go */
1455 #ifdef CONFIG_PPC_ISERIES
1456 _STATIC(__start_initialization_iSeries)
1457 /* Clear out the BSS */
1458 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1459 LOAD_REG_IMMEDIATE(r8,__bss_start)
1460 sub r11,r11,r8 /* bss size */
1461 addi r11,r11,7 /* round up to an even double word */
1462 rldicl. r11,r11,61,3 /* shift right by 3 */
1466 mtctr r11 /* zero this many doublewords */
1470 LOAD_REG_IMMEDIATE(r1,init_thread_union)
1471 addi r1,r1,THREAD_SIZE
1473 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1475 LOAD_REG_IMMEDIATE(r3,cpu_specs)
1476 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1480 LOAD_REG_IMMEDIATE(r2,__toc_start)
1484 bl .iSeries_early_setup
1487 /* relocation is on at this point */
1489 b .start_here_common
1490 #endif /* CONFIG_PPC_ISERIES */
1492 #ifdef CONFIG_PPC_MULTIPLATFORM
1496 andi. r0,r3,MSR_IR|MSR_DR
1503 b . /* prevent speculative execution */
1507 * Here is our main kernel entry point. We support currently 2 kind of entries
1508 * depending on the value of r5.
1510 * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content
1513 * r5 == NULL -> kexec style entry. r3 is a physical pointer to the
1514 * DT block, r4 is a physical pointer to the kernel itself
1517 _GLOBAL(__start_initialization_multiplatform)
1518 #ifdef CONFIG_PPC_MULTIPLATFORM
1520 * Are we booted from a PROM Of-type client-interface ?
1523 bne .__boot_from_prom /* yes -> prom */
1526 /* Save parameters */
1530 /* Make sure we are running in 64 bits mode */
1533 /* Setup some critical 970 SPRs before switching MMU off */
1534 bl .__970_cpu_preinit
1539 /* Switch off MMU if not already */
1540 LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
1543 b .__after_prom_start
1545 #ifdef CONFIG_PPC_MULTIPLATFORM
1546 _STATIC(__boot_from_prom)
1547 /* Save parameters */
1554 /* Make sure we are running in 64 bits mode */
1557 /* put a relocation offset into r3 */
1560 LOAD_REG_IMMEDIATE(r2,__toc_start)
1564 /* Relocate the TOC from a virt addr to a real addr */
1567 /* Restore parameters */
1574 /* Do all of the interaction with OF client interface */
1576 /* We never return */
1581 * At this point, r3 contains the physical address we are running at,
1582 * returned by prom_init()
1584 _STATIC(__after_prom_start)
1587 * We need to run with __start at physical address PHYSICAL_START.
1588 * This will leave some code in the first 256B of
1589 * real memory, which are reserved for software use.
1590 * The remainder of the first page is loaded with the fixed
1591 * interrupt vectors. The next two pages are filled with
1592 * unknown exception placeholders.
1594 * Note: This process overwrites the OF exception vectors.
1595 * r26 == relocation offset
1600 LOAD_REG_IMMEDIATE(r27, KERNELBASE)
1602 LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */
1604 // XXX FIXME: Use phys returned by OF (r30)
1605 add r4,r27,r26 /* source addr */
1606 /* current address of _start */
1607 /* i.e. where we are running */
1608 /* the source addr */
1610 LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
1613 li r6,0x100 /* Start offset, the first 0x100 */
1614 /* bytes were copied earlier. */
1616 bl .copy_and_flush /* copy the first n bytes */
1617 /* this includes the code being */
1618 /* executed here. */
1620 LOAD_REG_IMMEDIATE(r0, 4f) /* Jump to the copy of this code */
1621 mtctr r0 /* that we just made/relocated */
1624 4: LOAD_REG_IMMEDIATE(r5,klimit)
1626 ld r5,0(r5) /* get the value of klimit */
1628 bl .copy_and_flush /* copy the rest */
1629 b .start_here_multiplatform
1631 #endif /* CONFIG_PPC_MULTIPLATFORM */
1634 * Copy routine used to copy the kernel to start at physical address 0
1635 * and flush and invalidate the caches as needed.
1636 * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset
1637 * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5.
1639 * Note: this routine *only* clobbers r0, r6 and lr
1641 _GLOBAL(copy_and_flush)
1644 4: li r0,16 /* Use the least common */
1645 /* denominator cache line */
1646 /* size. This results in */
1647 /* extra cache line flushes */
1648 /* but operation is correct. */
1649 /* Can't get cache line size */
1650 /* from NACA as it is being */
1653 mtctr r0 /* put # words/line in ctr */
1654 3: addi r6,r6,8 /* copy a cache line */
1658 dcbst r6,r3 /* write it to memory */
1660 icbi r6,r3 /* flush the icache line */
1672 #ifdef CONFIG_PPC_PMAC
1674 * On PowerMac, secondary processors starts from the reset vector, which
1675 * is temporarily turned into a call to one of the functions below.
1680 .globl __secondary_start_pmac_0
1681 __secondary_start_pmac_0:
1682 /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */
1692 _GLOBAL(pmac_secondary_start)
1693 /* turn on 64-bit mode */
1697 /* Copy some CPU settings from CPU 0 */
1698 bl .__restore_cpu_setup
1700 /* pSeries do that early though I don't think we really need it */
1703 mtmsrd r3 /* RI on */
1705 /* Set up a paca value for this processor. */
1706 LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */
1707 mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */
1708 add r13,r13,r4 /* for this processor. */
1709 mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */
1711 /* Create a temp kernel stack for use before relocation is on. */
1712 ld r1,PACAEMERGSP(r13)
1713 subi r1,r1,STACK_FRAME_OVERHEAD
1715 b .__secondary_start
1717 #endif /* CONFIG_PPC_PMAC */
1720 * This function is called after the master CPU has released the
1721 * secondary processors. The execution environment is relocation off.
1722 * The paca for this processor has the following fields initialized at
1724 * 1. Processor number
1725 * 2. Segment table pointer (virtual address)
1726 * On entry the following are set:
1727 * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries
1728 * r24 = cpu# (in Linux terms)
1729 * r13 = paca virtual address
1730 * SPRG3 = paca virtual address
1732 _GLOBAL(__secondary_start)
1733 /* Set thread priority to MEDIUM */
1739 /* Do early setup for that CPU (stab, slb, hash table pointer) */
1740 bl .early_setup_secondary
1742 /* Initialize the kernel stack. Just a repeat for iSeries. */
1743 LOAD_REG_ADDR(r3, current_set)
1744 sldi r28,r24,3 /* get current_set[cpu#] */
1746 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1747 std r1,PACAKSAVE(r13)
1749 /* Clear backchain so we get nice backtraces */
1753 /* enable MMU and jump to start_secondary */
1754 LOAD_REG_ADDR(r3, .start_secondary_prolog)
1755 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1756 #ifdef DO_SOFT_DISABLE
1762 b . /* prevent speculative execution */
1765 * Running with relocation on at this point. All we want to do is
1766 * zero the stack back-chain pointer before going into C code.
1768 _GLOBAL(start_secondary_prolog)
1770 std r3,0(r1) /* Zero the stack frame pointer */
1776 * This subroutine clobbers r11 and r12
1778 _GLOBAL(enable_64b_mode)
1779 mfmsr r11 /* grab the current MSR */
1781 rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
1784 rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
1790 #ifdef CONFIG_PPC_MULTIPLATFORM
1792 * This is where the main kernel code starts.
1794 _STATIC(start_here_multiplatform)
1795 /* get a new offset, now that the kernel has moved. */
1799 /* Clear out the BSS. It may have been done in prom_init,
1800 * already but that's irrelevant since prom_init will soon
1801 * be detached from the kernel completely. Besides, we need
1802 * to clear it now for kexec-style entry.
1804 LOAD_REG_IMMEDIATE(r11,__bss_stop)
1805 LOAD_REG_IMMEDIATE(r8,__bss_start)
1806 sub r11,r11,r8 /* bss size */
1807 addi r11,r11,7 /* round up to an even double word */
1808 rldicl. r11,r11,61,3 /* shift right by 3 */
1812 mtctr r11 /* zero this many doublewords */
1819 mtmsrd r6 /* RI on */
1822 /* Start up the second thread on cpu 0 */
1825 cmpwi r3,0x34 /* Pulsar */
1827 cmpwi r3,0x36 /* Icestar */
1829 cmpwi r3,0x37 /* SStar */
1831 b 91f /* HMT not supported */
1833 bl .hmt_start_secondary
1837 /* The following gets the stack and TOC set up with the regs */
1838 /* pointing to the real addr of the kernel stack. This is */
1839 /* all done to support the C function call below which sets */
1840 /* up the htab. This is done because we have relocated the */
1841 /* kernel but are still running in real mode. */
1843 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1846 /* set up a stack pointer (physical address) */
1847 addi r1,r3,THREAD_SIZE
1849 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1851 /* set up the TOC (physical address) */
1852 LOAD_REG_IMMEDIATE(r2,__toc_start)
1857 LOAD_REG_IMMEDIATE(r3, cpu_specs)
1859 LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
1864 /* Save some low level config HIDs of CPU0 to be copied to
1865 * other CPUs later on, or used for suspend/resume
1867 bl .__save_cpu_setup
1870 /* Setup a valid physical PACA pointer in SPRG3 for early_setup
1871 * note that boot_cpuid can always be 0 nowadays since there is
1872 * nowhere it can be initialized differently before we reach this
1875 LOAD_REG_IMMEDIATE(r27, boot_cpuid)
1879 LOAD_REG_IMMEDIATE(r24, paca) /* Get base vaddr of paca array */
1880 mulli r13,r27,PACA_SIZE /* Calculate vaddr of right paca */
1881 add r13,r13,r24 /* for this processor. */
1882 add r13,r13,r26 /* convert to physical addr */
1883 mtspr SPRN_SPRG3,r13
1885 /* Do very early kernel initializations, including initial hash table,
1886 * stab and slb setup before we turn on relocation. */
1888 /* Restore parameters passed from prom_init/kexec */
1892 LOAD_REG_IMMEDIATE(r3, .start_here_common)
1893 LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
1897 b . /* prevent speculative execution */
1898 #endif /* CONFIG_PPC_MULTIPLATFORM */
1900 /* This is where all platforms converge execution */
1901 _STATIC(start_here_common)
1902 /* relocation is on at this point */
1904 /* The following code sets up the SP and TOC now that we are */
1905 /* running with translation enabled. */
1907 LOAD_REG_IMMEDIATE(r3,init_thread_union)
1909 /* set up the stack */
1910 addi r1,r3,THREAD_SIZE
1912 stdu r0,-STACK_FRAME_OVERHEAD(r1)
1914 /* Apply the CPUs-specific fixups (nop out sections not relevant
1918 bl .do_cpu_ftr_fixups
1920 LOAD_REG_IMMEDIATE(r26, boot_cpuid)
1923 LOAD_REG_IMMEDIATE(r24, paca) /* Get base vaddr of paca array */
1924 mulli r13,r26,PACA_SIZE /* Calculate vaddr of right paca */
1925 add r13,r13,r24 /* for this processor. */
1926 mtspr SPRN_SPRG3,r13
1928 /* ptr to current */
1929 LOAD_REG_IMMEDIATE(r4, init_task)
1930 std r4,PACACURRENT(r13)
1934 std r1,PACAKSAVE(r13)
1938 /* Load up the kernel context */
1940 #ifdef DO_SOFT_DISABLE
1942 stb r5,PACAPROCENABLED(r13) /* Soft Disabled */
1944 ori r5,r5,MSR_EE /* Hard Enabled */
1952 LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
1955 cmpwi r7,0x34 /* Pulsar */
1957 cmpwi r7,0x36 /* Icestar */
1959 cmpwi r7,0x37 /* SStar */
1962 90: mfspr r6,SPRN_PIR
1965 91: mfspr r6,SPRN_PIR
1969 bl .hmt_start_secondary
1972 __hmt_secondary_hold:
1973 LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
1983 93: andi. r6,r6,0x3f
1997 b .pSeries_secondary_smp_init
2000 _GLOBAL(hmt_start_secondary)
2001 LOAD_REG_IMMEDIATE(r4,__hmt_secondary_hold)
2003 mtspr SPRN_NIADORM, r4
2004 mfspr r4, SPRN_MSRDORM
2007 mtspr SPRN_MSRDORM, r4
2016 mfspr r4, SPRN_CTRLF
2018 mtspr SPRN_CTRLT, r4
2023 * We put a few things here that have to be page-aligned.
2024 * This stuff goes at the beginning of the bss, which is page-aligned.
2030 .globl empty_zero_page
2034 .globl swapper_pg_dir
2039 * This space gets a copy of optional info passed to us by the bootstrap
2040 * Used to pass parameters into the kernel like root=/dev/sda1, etc.
2044 .space COMMAND_LINE_SIZE