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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* PowerPC 64-bit swsusp implementation
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*/
#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>
#include <asm/feature-fixups.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 .text
.align 5
_GLOBAL(swsusp_arch_suspend)
LOAD_REG_ADDR(r11, swsusp_save_area)
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 swsusp_save
/* restore LR */
LOAD_REG_ADDR(r11, swsusp_save_area)
RESTORE_SPECIAL(LR)
addi r1,r1,128
blr
/* Resume code */
_GLOBAL(swsusp_arch_resume)
/* Stop pending alitvec streams and memory accesses */
BEGIN_FTR_SECTION
PPC_DSSALL
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
sync
LOAD_REG_ADDR(r11, restore_pblist)
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 0,r3
addi r3,r3,0x20
bdnz 1b
sync
tlbia
#endif
LOAD_REG_ADDR(r11, swsusp_save_area)
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_restore_bolted
#endif
bl do_after_copyback
addi r1,r1,128
LOAD_REG_ADDR(r11, swsusp_save_area)
RESTORE_SPECIAL(LR)
li r3, 0
blr
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