arch/arm64/include/asm/suspend.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SUSPEND_H
   3 #define __ASM_SUSPEND_H
   4
   5 #define NR_CTX_REGS 12
   6 #define NR_CALLEE_SAVED_REGS 12
   7
   8 /*
   9  * struct cpu_suspend_ctx must be 16-byte aligned since it is allocated on
  10  * the stack, which must be 16-byte aligned on v8
  11  */
  12 struct cpu_suspend_ctx {
  13         /*
  14          * This struct must be kept in sync with
  15          * cpu_do_{suspend/resume} in mm/proc.S
  16          */
  17         u64 ctx_regs[NR_CTX_REGS];
  18         u64 sp;
  19 } __aligned(16);
  20
  21 /*
  22  * Memory to save the cpu state is allocated on the stack by
  23  * __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter().
  24  * This data must survive until cpu_resume() is called.
  25  *
  26  * This struct desribes the size and the layout of the saved cpu state.
  27  * The layout of the callee_saved_regs is defined by the implementation
  28  * of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed
  29  * in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it
  30  * returns, and the data would be subsequently corrupted by the call to the
  31  * finisher.
  32  */
  33 struct sleep_stack_data {
  34         struct cpu_suspend_ctx  system_regs;
  35         unsigned long           callee_saved_regs[NR_CALLEE_SAVED_REGS];
  36 };
  37
  38 extern unsigned long *sleep_save_stash;
  39
  40 extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long));
  41 extern void cpu_resume(void);
  42 int __cpu_suspend_enter(struct sleep_stack_data *state);
  43 void __cpu_suspend_exit(void);
  44 void _cpu_resume(void);
  45
  46 int swsusp_arch_suspend(void);
  47 int swsusp_arch_resume(void);
  48 int arch_hibernation_header_save(void *addr, unsigned int max_size);
  49 int arch_hibernation_header_restore(void *addr);
  50
  51 /* Used to resume on the CPU we hibernated on */
  52 int hibernate_resume_nonboot_cpu_disable(void);
  53
  54 #endif