203 lines
3.8 KiB
ArmAsm
203 lines
3.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Based on swsusp_32.S, modified for FSL BookE by
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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* Copyright (c) 2009-2010 MontaVista Software, LLC.
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*/
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#include <linux/threads.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/mmu.h>
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/*
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* Structure for storing CPU registers on the save area.
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*/
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#define SL_SP 0
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#define SL_PC 4
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#define SL_MSR 8
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#define SL_TCR 0xc
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#define SL_SPRG0 0x10
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#define SL_SPRG1 0x14
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#define SL_SPRG2 0x18
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#define SL_SPRG3 0x1c
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#define SL_SPRG4 0x20
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#define SL_SPRG5 0x24
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#define SL_SPRG6 0x28
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#define SL_SPRG7 0x2c
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#define SL_TBU 0x30
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#define SL_TBL 0x34
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#define SL_R2 0x38
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#define SL_CR 0x3c
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#define SL_LR 0x40
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#define SL_R12 0x44 /* r12 to r31 */
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#define SL_SIZE (SL_R12 + 80)
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.section .data
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.align 5
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_GLOBAL(swsusp_save_area)
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.space SL_SIZE
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.section .text
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.align 5
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_GLOBAL(swsusp_arch_suspend)
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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mflr r0
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stw r0,SL_LR(r11)
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mfcr r0
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stw r0,SL_CR(r11)
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stw r1,SL_SP(r11)
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stw r2,SL_R2(r11)
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stmw r12,SL_R12(r11)
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/* Save MSR & TCR */
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mfmsr r4
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stw r4,SL_MSR(r11)
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mfspr r4,SPRN_TCR
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stw r4,SL_TCR(r11)
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/* Get a stable timebase and save it */
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1: mfspr r4,SPRN_TBRU
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stw r4,SL_TBU(r11)
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mfspr r5,SPRN_TBRL
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stw r5,SL_TBL(r11)
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mfspr r3,SPRN_TBRU
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cmpw r3,r4
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bne 1b
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/* Save SPRGs */
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mfspr r4,SPRN_SPRG0
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stw r4,SL_SPRG0(r11)
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mfspr r4,SPRN_SPRG1
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stw r4,SL_SPRG1(r11)
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mfspr r4,SPRN_SPRG2
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stw r4,SL_SPRG2(r11)
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mfspr r4,SPRN_SPRG3
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stw r4,SL_SPRG3(r11)
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mfspr r4,SPRN_SPRG4
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stw r4,SL_SPRG4(r11)
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mfspr r4,SPRN_SPRG5
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stw r4,SL_SPRG5(r11)
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mfspr r4,SPRN_SPRG6
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stw r4,SL_SPRG6(r11)
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mfspr r4,SPRN_SPRG7
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stw r4,SL_SPRG7(r11)
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/* Call the low level suspend stuff (we should probably have made
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* a stackframe...
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*/
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bl swsusp_save
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/* Restore LR from the save area */
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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lwz r0,SL_LR(r11)
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mtlr r0
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blr
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_GLOBAL(swsusp_arch_resume)
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sync
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/* Load ptr the list of pages to copy in r3 */
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lis r11,(restore_pblist)@h
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ori r11,r11,restore_pblist@l
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lwz r3,0(r11)
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/* Copy the pages. This is a very basic implementation, to
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* be replaced by something more cache efficient */
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1:
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li r0,256
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mtctr r0
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lwz r5,pbe_address(r3) /* source */
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lwz r6,pbe_orig_address(r3) /* destination */
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2:
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lwz r8,0(r5)
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lwz r9,4(r5)
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lwz r10,8(r5)
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lwz r11,12(r5)
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addi r5,r5,16
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stw r8,0(r6)
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stw r9,4(r6)
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stw r10,8(r6)
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stw r11,12(r6)
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addi r6,r6,16
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bdnz 2b
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lwz r3,pbe_next(r3)
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cmpwi 0,r3,0
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bne 1b
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bl flush_dcache_L1
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bl flush_instruction_cache
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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/*
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* Mappings from virtual addresses to physical addresses may be
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* different than they were prior to restoring hibernation state.
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* Invalidate the TLB so that the boot CPU is using the new
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* mappings.
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*/
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bl _tlbil_all
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lwz r4,SL_SPRG0(r11)
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mtspr SPRN_SPRG0,r4
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lwz r4,SL_SPRG1(r11)
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mtspr SPRN_SPRG1,r4
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lwz r4,SL_SPRG2(r11)
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mtspr SPRN_SPRG2,r4
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lwz r4,SL_SPRG3(r11)
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mtspr SPRN_SPRG3,r4
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lwz r4,SL_SPRG4(r11)
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mtspr SPRN_SPRG4,r4
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lwz r4,SL_SPRG5(r11)
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mtspr SPRN_SPRG5,r4
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lwz r4,SL_SPRG6(r11)
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mtspr SPRN_SPRG6,r4
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lwz r4,SL_SPRG7(r11)
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mtspr SPRN_SPRG7,r4
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/* restore the MSR */
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lwz r3,SL_MSR(r11)
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mtmsr r3
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/* Restore TB */
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li r3,0
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mtspr SPRN_TBWL,r3
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lwz r3,SL_TBU(r11)
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lwz r4,SL_TBL(r11)
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mtspr SPRN_TBWU,r3
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mtspr SPRN_TBWL,r4
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/* Restore TCR and clear any pending bits in TSR. */
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lwz r4,SL_TCR(r11)
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mtspr SPRN_TCR,r4
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lis r4, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h
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mtspr SPRN_TSR,r4
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/* Kick decrementer */
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li r0,1
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mtdec r0
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/* Restore the callee-saved registers and return */
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lwz r0,SL_CR(r11)
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mtcr r0
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lwz r2,SL_R2(r11)
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lmw r12,SL_R12(r11)
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lwz r1,SL_SP(r11)
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lwz r0,SL_LR(r11)
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mtlr r0
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li r3,0
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blr
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