1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SUSPEND_H 3 #define __ASM_SUSPEND_H 4 5 #define NR_CTX_REGS 13 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 55