mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 04:42:12 +00:00
cabe1c81ea
By enabling the MMU early in cpu_resume(), the sleep_save_sp and stack can
be accessed by VA, which avoids the need to convert-addresses and clean to
PoC on the suspend path.
MMU setup is shared with the boot path, meaning the swapper_pg_dir is
restored directly: ttbr1_el1 is no longer saved/restored.
struct sleep_save_sp is removed, replacing it with a single array of
pointers.
cpu_do_{suspend,resume} could be further reduced to not restore: cpacr_el1,
mdscr_el1, tcr_el1, vbar_el1 and sctlr_el1, all of which are set by
__cpu_setup(). However these values all contain res0 bits that may be used
to enable future features.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
#ifndef __ASM_SUSPEND_H
|
|
#define __ASM_SUSPEND_H
|
|
|
|
#define NR_CTX_REGS 10
|
|
#define NR_CALLEE_SAVED_REGS 12
|
|
|
|
/*
|
|
* struct cpu_suspend_ctx must be 16-byte aligned since it is allocated on
|
|
* the stack, which must be 16-byte aligned on v8
|
|
*/
|
|
struct cpu_suspend_ctx {
|
|
/*
|
|
* This struct must be kept in sync with
|
|
* cpu_do_{suspend/resume} in mm/proc.S
|
|
*/
|
|
u64 ctx_regs[NR_CTX_REGS];
|
|
u64 sp;
|
|
} __aligned(16);
|
|
|
|
/*
|
|
* Memory to save the cpu state is allocated on the stack by
|
|
* __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter().
|
|
* This data must survive until cpu_resume() is called.
|
|
*
|
|
* This struct desribes the size and the layout of the saved cpu state.
|
|
* The layout of the callee_saved_regs is defined by the implementation
|
|
* of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed
|
|
* in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it
|
|
* returns, and the data would be subsequently corrupted by the call to the
|
|
* finisher.
|
|
*/
|
|
struct sleep_stack_data {
|
|
struct cpu_suspend_ctx system_regs;
|
|
unsigned long callee_saved_regs[NR_CALLEE_SAVED_REGS];
|
|
};
|
|
|
|
extern unsigned long *sleep_save_stash;
|
|
|
|
extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long));
|
|
extern void cpu_resume(void);
|
|
int __cpu_suspend_enter(struct sleep_stack_data *state);
|
|
void __cpu_suspend_exit(void);
|
|
#endif
|