/* SPDX-License-Identifier: GPL-2.0
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*
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* arch/sh/kernel/cpu/sh3/swsusp.S
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*
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* Copyright (C) 2009 Magnus Damm
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*/
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#include <linux/sys.h>
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#define k0 r0
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#define k1 r1
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#define k2 r2
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#define k3 r3
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#define k4 r4
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! swsusp_arch_resume()
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! - copy restore_pblist pages
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! - restore registers from swsusp_arch_regs_cpu0
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ENTRY(swsusp_arch_resume)
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mov.l 1f, r15
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mov.l 2f, r4
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mov.l @r4, r4
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swsusp_copy_loop:
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mov r4, r0
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cmp/eq #0, r0
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bt swsusp_restore_regs
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mov.l @(PBE_ADDRESS, r4), r2
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mov.l @(PBE_ORIG_ADDRESS, r4), r5
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mov #(PAGE_SIZE >> 10), r3
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shll8 r3
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shlr2 r3 /* PAGE_SIZE / 16 */
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swsusp_copy_page:
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dt r3
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mov.l @r2+,r1 /* 16n+0 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+4 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+8 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+12 */
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mov.l r1,@r5
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bf/s swsusp_copy_page
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add #4,r5
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bra swsusp_copy_loop
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mov.l @(PBE_NEXT, r4), r4
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swsusp_restore_regs:
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! BL=0: R7->R0 is bank0
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mov.l 3f, r8
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mov.l 4f, r5
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jsr @r5
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nop
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! BL=1: R7->R0 is bank1
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lds k2, pr
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ldc k3, ssr
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mov.l @r15+, r0
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mov.l @r15+, r1
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mov.l @r15+, r2
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mov.l @r15+, r3
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mov.l @r15+, r4
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mov.l @r15+, r5
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mov.l @r15+, r6
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mov.l @r15+, r7
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rte
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nop
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! BL=0: R7->R0 is bank0
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.align 2
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1: .long swsusp_arch_regs_cpu0
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2: .long restore_pblist
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3: .long 0x20000000 ! RB=1
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4: .long restore_regs
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! swsusp_arch_suspend()
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! - prepare pc for resume, return from function without swsusp_save on resume
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! - save registers in swsusp_arch_regs_cpu0
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! - call swsusp_save write suspend image
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ENTRY(swsusp_arch_suspend)
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sts pr, r0 ! save pr in r0
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mov r15, r2 ! save sp in r2
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mov r8, r5 ! save r8 in r5
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stc sr, r1
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ldc r1, ssr ! save sr in ssr
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mov.l 1f, r1
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ldc r1, spc ! setup pc value for resuming
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mov.l 5f, r15 ! use swsusp_arch_regs_cpu0 as stack
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mov.l 6f, r3
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add r3, r15 ! save from top of structure
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! BL=0: R7->R0 is bank0
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mov.l 2f, r3 ! get new SR value for bank1
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mov #0, r4
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mov.l 7f, r1
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jsr @r1 ! switch to bank1 and save bank1 r7->r0
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not r4, r4
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! BL=1: R7->R0 is bank1
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stc r2_bank, k0 ! fetch old sp from r2_bank0
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mov.l 3f, k4 ! SR bits to clear in k4
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mov.l 8f, k1
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jsr @k1 ! switch to bank0 and save all regs
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stc r0_bank, k3 ! fetch old pr from r0_bank0
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! BL=0: R7->R0 is bank0
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mov r2, r15 ! restore old sp
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mov r5, r8 ! restore old r8
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stc ssr, r1
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ldc r1, sr ! restore old sr
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lds r0, pr ! restore old pr
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mov.l 4f, r0
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jmp @r0
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nop
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swsusp_call_save:
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mov r2, r15 ! restore old sp
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mov r5, r8 ! restore old r8
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lds r0, pr ! restore old pr
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rts
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mov #0, r0
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.align 2
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1: .long swsusp_call_save
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2: .long 0x20000000 ! RB=1
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3: .long 0xdfffffff ! RB=0
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4: .long swsusp_save
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5: .long swsusp_arch_regs_cpu0
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6: .long SWSUSP_ARCH_REGS_SIZE
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7: .long save_low_regs
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8: .long save_regs
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