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linux/arch/powerpc/kernel/swsusp_asm64.S
Dan Streetman 711b5138d5 powerpc: Only save/restore SDR1 if in hypervisor mode 
Currently, when not in hypervisor mode the kernel
Oopses during suspend or hibernation when accessing
the SDR1 register, because it is only available
in hypervisor mode.  Access to it needs to be
protected in BEGIN/END_FW_FTR_SECTION.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reported-by: Jimmy Pan <jipan@redhat.com>
Tested-by: Jimmy Pan <jipan@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-10-31 12:37:29 +11:00

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/*
* PowerPC 64-bit swsusp implementation
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPLv2
*/
#include <linux/threads.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
/*
* Structure for storing CPU registers on the save area.
*/
#define SL_r1 0x00 /* stack pointer */
#define SL_PC 0x08
#define SL_MSR 0x10
#define SL_SDR1 0x18
#define SL_XER 0x20
#define SL_TB 0x40
#define SL_r2 0x48
#define SL_CR 0x50
#define SL_LR 0x58
#define SL_r12 0x60
#define SL_r13 0x68
#define SL_r14 0x70
#define SL_r15 0x78
#define SL_r16 0x80
#define SL_r17 0x88
#define SL_r18 0x90
#define SL_r19 0x98
#define SL_r20 0xa0
#define SL_r21 0xa8
#define SL_r22 0xb0
#define SL_r23 0xb8
#define SL_r24 0xc0
#define SL_r25 0xc8
#define SL_r26 0xd0
#define SL_r27 0xd8
#define SL_r28 0xe0
#define SL_r29 0xe8
#define SL_r30 0xf0
#define SL_r31 0xf8
#define SL_SPRG1 0x100
#define SL_TCR 0x108
#define SL_SIZE SL_TCR+8
/* these macros rely on the save area being
* pointed to by r11 */
#define SAVE_SPR(register) \
mfspr r0, SPRN_##register ;\
std r0, SL_##register(r11)
#define RESTORE_SPR(register) \
ld r0, SL_##register(r11) ;\
mtspr SPRN_##register, r0
#define SAVE_SPECIAL(special) \
mf##special r0 ;\
std r0, SL_##special(r11)
#define RESTORE_SPECIAL(special) \
ld r0, SL_##special(r11) ;\
mt##special r0
#define SAVE_REGISTER(reg) \
std reg, SL_##reg(r11)
#define RESTORE_REGISTER(reg) \
ld reg, SL_##reg(r11)
/* space for storing cpu state */
.section .data
.align 5
swsusp_save_area:
.space SL_SIZE
.section ".toc","aw"
swsusp_save_area_ptr:
.tc swsusp_save_area[TC],swsusp_save_area
restore_pblist_ptr:
.tc restore_pblist[TC],restore_pblist
.section .text
.align 5
_GLOBAL(swsusp_arch_suspend)
ld r11,swsusp_save_area_ptr@toc(r2)
SAVE_SPECIAL(LR)
SAVE_REGISTER(r1)
SAVE_SPECIAL(CR)
SAVE_SPECIAL(TB)
SAVE_REGISTER(r2)
SAVE_REGISTER(r12)
SAVE_REGISTER(r13)
SAVE_REGISTER(r14)
SAVE_REGISTER(r15)
SAVE_REGISTER(r16)
SAVE_REGISTER(r17)
SAVE_REGISTER(r18)
SAVE_REGISTER(r19)
SAVE_REGISTER(r20)
SAVE_REGISTER(r21)
SAVE_REGISTER(r22)
SAVE_REGISTER(r23)
SAVE_REGISTER(r24)
SAVE_REGISTER(r25)
SAVE_REGISTER(r26)
SAVE_REGISTER(r27)
SAVE_REGISTER(r28)
SAVE_REGISTER(r29)
SAVE_REGISTER(r30)
SAVE_REGISTER(r31)
SAVE_SPECIAL(MSR)
SAVE_SPECIAL(XER)
#ifdef CONFIG_PPC_BOOK3S_64
BEGIN_FW_FTR_SECTION
SAVE_SPECIAL(SDR1)
END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
#else
SAVE_SPR(TCR)
/* Save SPRG1, SPRG1 be used save paca */
SAVE_SPR(SPRG1)
#endif
/* we push the stack up 128 bytes but don't store the
* stack pointer on the stack like a real stackframe */
addi r1,r1,-128
bl _iommu_save
bl swsusp_save
/* restore LR */
ld r11,swsusp_save_area_ptr@toc(r2)
RESTORE_SPECIAL(LR)
addi r1,r1,128
blr
/* Resume code */
_GLOBAL(swsusp_arch_resume)
/* Stop pending alitvec streams and memory accesses */
BEGIN_FTR_SECTION
DSSALL
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
sync
ld r12,restore_pblist_ptr@toc(r2)
ld r12,0(r12)
cmpdi r12,0
beq- nothing_to_copy
li r15,PAGE_SIZE>>3
copyloop:
ld r13,pbe_address(r12)
ld r14,pbe_orig_address(r12)
mtctr r15
li r10,0
copy_page_loop:
ldx r0,r10,r13
stdx r0,r10,r14
addi r10,r10,8
bdnz copy_page_loop
ld r12,pbe_next(r12)
cmpdi r12,0
bne+ copyloop
nothing_to_copy:
#ifdef CONFIG_PPC_BOOK3S_64
/* flush caches */
lis r3, 0x10
mtctr r3
li r3, 0
ori r3, r3, CONFIG_KERNEL_START>>48
li r0, 48
sld r3, r3, r0
li r0, 0
1:
dcbf r0,r3
addi r3,r3,0x20
bdnz 1b
sync
tlbia
#endif
ld r11,swsusp_save_area_ptr@toc(r2)
RESTORE_SPECIAL(CR)
/* restore timebase */
/* load saved tb */
ld r1, SL_TB(r11)
/* get upper 32 bits of it */
srdi r2, r1, 32
/* clear tb lower to avoid wrap */
li r0, 0
mttbl r0
/* set tb upper */
mttbu r2
/* set tb lower */
mttbl r1
/* restore registers */
RESTORE_REGISTER(r1)
RESTORE_REGISTER(r2)
RESTORE_REGISTER(r12)
RESTORE_REGISTER(r13)
RESTORE_REGISTER(r14)
RESTORE_REGISTER(r15)
RESTORE_REGISTER(r16)
RESTORE_REGISTER(r17)
RESTORE_REGISTER(r18)
RESTORE_REGISTER(r19)
RESTORE_REGISTER(r20)
RESTORE_REGISTER(r21)
RESTORE_REGISTER(r22)
RESTORE_REGISTER(r23)
RESTORE_REGISTER(r24)
RESTORE_REGISTER(r25)
RESTORE_REGISTER(r26)
RESTORE_REGISTER(r27)
RESTORE_REGISTER(r28)
RESTORE_REGISTER(r29)
RESTORE_REGISTER(r30)
RESTORE_REGISTER(r31)
#ifdef CONFIG_PPC_BOOK3S_64
/* can't use RESTORE_SPECIAL(MSR) */
ld r0, SL_MSR(r11)
mtmsrd r0, 0
BEGIN_FW_FTR_SECTION
RESTORE_SPECIAL(SDR1)
END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
#else
/* Restore SPRG1, be used to save paca */
ld r0, SL_SPRG1(r11)
mtsprg 1, r0
RESTORE_SPECIAL(MSR)
/* Restore TCR and clear any pending bits in TSR. */
RESTORE_SPR(TCR)
lis r0, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h
mtspr SPRN_TSR, r0
/* Kick decrementer */
li r0, 1
mtdec r0
/* Invalidate all tlbs */
bl _tlbil_all
#endif
RESTORE_SPECIAL(XER)
sync
addi r1,r1,-128
#ifdef CONFIG_PPC_BOOK3S_64
bl slb_flush_and_rebolt
#endif
bl do_after_copyback
addi r1,r1,128
ld r11,swsusp_save_area_ptr@toc(r2)
RESTORE_SPECIAL(LR)
li r3, 0
blr
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