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/*
* Hibernation support specific for ARM
*
* Copyright (C) 2010 Nokia Corporation
* Copyright (C) 2010 Texas Instruments, Inc.
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*
* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/linkage.h>
.text
ENTRY(swsusp_arch_suspend)
/*
* Save current program status register
*/
ldr r3, .Lsaved_cpsr
mrs r0, cpsr
str r0, [r3]
/*
* Change to system(user) mode
*/
mov r1, r0
orr r1, r1, #0x1f
msr cpsr_c, r1
/*
* Save User context
*/
ldr r3, .Lsaved_context_r0
stmia r3, {r0-r14}
/*
* Go back to original SVC mode
*/
msr cpsr_c, r0
/*
* Save SVC context
*/
ldr r3, .Lsaved_context_r13_svc
stmia r3, {r13-r14}
ldr r3, .Lsaved_spsr_svc
mrs r1, spsr
str r1, [r3]
bl swsusp_save
/*
* Restore return address
*/
ldr r3, .Lsaved_context_r14_svc
ldr lr, [r3]
mov pc, lr
ENDPROC(swsusp_arch_suspend)
ENTRY(swsusp_arch_resume)
/*
* Restore_pblist is the starting point for loaded pages
*/
ldr r0, .Lrestore_pblist
ldr r6, [r0]
.Lcopy_loop:
ldr r4, [r6] /* src IOW present address */
ldr r5, [r6, #4] /* dst IOW original address*/
/* No. of entries in one page, where each entry is 4 bytes */
mov r9, #1024
.Lcopy_one_page:
/*
* This loop could be optimized by using stm and ldm.
*/
ldr r8, [r4], #4
str r8, [r5], #4
subs r9, r9, #1
bne .Lcopy_one_page
/*
* The last field of struct pbe is a pointer to the next pbe structure
*/
ldr r6, [r6, #8]
cmp r6, #0
bne .Lcopy_loop
/*
* Restore SVC context
*/
ldr r3, .Lsaved_context_r13_svc
ldmia r3, {r13-r14}
ldr r3, .Lsaved_spsr_svc
ldr r1, [r3]
msr spsr_cxsf, r1
mrs r0, cpsr /* Save current mode into r0 */
/*
* Change to system(user) mode
*/
mov r1, r0
orr r1, r1, #0x1f
msr cpsr_c, r1
/*
* Restore User context
*/
ldr r3, .Lsaved_context_r0
ldmia r3, {r0-r14}
ldr r3, .Lsaved_cpsr
ldr r1, [r3]
msr cpsr_cxsf, r1
msr cpsr_c, r0 /* Restore original mode from r0 */
/*
* Flush TLB (Invalidate unified TLB unlocked entries)
*/
mov r1, #0
mcr p15, 0, r1, c8, c7, 0
/* Set the return value */
mov r0, #0
/* Restore return address */
ldr r3, .Lsaved_context_r14_svc
ldr lr, [r3]
mov pc, lr
ENDPROC(swsusp_arch_resume)
.align 4
.Lsaved_context_r0: .long saved_context_r0
.Lsaved_cpsr: .long saved_cpsr
.Lsaved_context_r13_svc: .long saved_context_r13_svc
.Lsaved_context_r14_svc: .long saved_context_r14_svc
.Lsaved_spsr_svc: .long saved_spsr_svc
.Lrestore_pblist: .long restore_pblist
|
