82869ac57b
Add support for hibernate/suspend-to-disk. Suspend borrows code from cpu_suspend() to write cpu state onto the stack, before calling swsusp_save() to save the memory image. Restore creates a set of temporary page tables, covering only the linear map, copies the restore code to a 'safe' page, then uses the copy to restore the memory image. The copied code executes in the lower half of the address space, and once complete, restores the original kernel's page tables. It then calls into cpu_resume(), and follows the normal cpu_suspend() path back into the suspend code. To restore a kernel using KASLR, the address of the page tables, and cpu_resume() are stored in the hibernate arch-header and the el2 vectors are pivotted via the 'safe' page in low memory. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Kevin Hilman <khilman@baylibre.com> # Tested on Juno R2 Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
#ifndef __ASM_SUSPEND_H
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#define __ASM_SUSPEND_H
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#define NR_CTX_REGS 10
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#define NR_CALLEE_SAVED_REGS 12
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/*
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* struct cpu_suspend_ctx must be 16-byte aligned since it is allocated on
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* the stack, which must be 16-byte aligned on v8
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*/
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struct cpu_suspend_ctx {
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/*
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* This struct must be kept in sync with
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* cpu_do_{suspend/resume} in mm/proc.S
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*/
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u64 ctx_regs[NR_CTX_REGS];
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u64 sp;
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} __aligned(16);
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/*
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* Memory to save the cpu state is allocated on the stack by
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* __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter().
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* This data must survive until cpu_resume() is called.
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*
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* This struct desribes the size and the layout of the saved cpu state.
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* The layout of the callee_saved_regs is defined by the implementation
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* of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed
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* in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it
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* returns, and the data would be subsequently corrupted by the call to the
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* finisher.
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*/
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struct sleep_stack_data {
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struct cpu_suspend_ctx system_regs;
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unsigned long callee_saved_regs[NR_CALLEE_SAVED_REGS];
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};
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extern unsigned long *sleep_save_stash;
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extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long));
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extern void cpu_resume(void);
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int __cpu_suspend_enter(struct sleep_stack_data *state);
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void __cpu_suspend_exit(void);
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void _cpu_resume(void);
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int swsusp_arch_suspend(void);
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int swsusp_arch_resume(void);
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int arch_hibernation_header_save(void *addr, unsigned int max_size);
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int arch_hibernation_header_restore(void *addr);
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#endif
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