The ARM CPU suspend code requires cpu_resume_mmu to be identity mapped
in order to re-enable the MMU when coming out of suspend. Currently,
this is accomplished by maintaining a suspend_pgd with the relevant
mapping put in place at init time.
This patch replaces the use of suspend_pgd with the new idmap_pgd.
cpu_resume_mmu is placed in the .idmap.text section so that it is
included in the identity map.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
* r0 = control register value
*/
.align 5
* r0 = control register value
*/
.align 5
+ .pushsection .idmap.text,"ax"
ENTRY(cpu_resume_mmu)
ldr r3, =cpu_resume_after_mmu
mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc
ENTRY(cpu_resume_mmu)
ldr r3, =cpu_resume_after_mmu
mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc
mov r0, r0
mov pc, r3 @ jump to virtual address
ENDPROC(cpu_resume_mmu)
mov r0, r0
mov pc, r3 @ jump to virtual address
ENDPROC(cpu_resume_mmu)
cpu_resume_after_mmu:
bl cpu_init @ restore the und/abt/irq banked regs
mov r0, #0 @ return zero on success
cpu_resume_after_mmu:
bl cpu_init @ restore the und/abt/irq banked regs
mov r0, #0 @ return zero on success
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/memory.h>
#include <asm/suspend.h>
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/memory.h>
#include <asm/suspend.h>
#include <asm/tlbflush.h>
-static pgd_t *suspend_pgd;
-
extern int __cpu_suspend(unsigned long, int (*)(unsigned long));
extern void cpu_resume_mmu(void);
extern int __cpu_suspend(unsigned long, int (*)(unsigned long));
extern void cpu_resume_mmu(void);
*save_ptr = virt_to_phys(ptr);
/* This must correspond to the LDM in cpu_resume() assembly */
*save_ptr = virt_to_phys(ptr);
/* This must correspond to the LDM in cpu_resume() assembly */
- *ptr++ = virt_to_phys(suspend_pgd);
+ *ptr++ = virt_to_phys(idmap_pgd);
*ptr++ = sp;
*ptr++ = virt_to_phys(cpu_do_resume);
*ptr++ = sp;
*ptr++ = virt_to_phys(cpu_do_resume);
struct mm_struct *mm = current->active_mm;
int ret;
struct mm_struct *mm = current->active_mm;
int ret;
-
-static int __init cpu_suspend_init(void)
-{
- suspend_pgd = pgd_alloc(&init_mm);
- if (suspend_pgd) {
- unsigned long addr = virt_to_phys(cpu_resume_mmu);
- identity_mapping_add(suspend_pgd, addr, addr + SECTION_SIZE);
- }
- return suspend_pgd ? 0 : -ENOMEM;
-}
-core_initcall(cpu_suspend_init);