1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_SUSPEND_H 3*4882a593Smuzhiyun #define __ASM_SUSPEND_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #define NR_CTX_REGS 13 6*4882a593Smuzhiyun #define NR_CALLEE_SAVED_REGS 12 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun /* 9*4882a593Smuzhiyun * struct cpu_suspend_ctx must be 16-byte aligned since it is allocated on 10*4882a593Smuzhiyun * the stack, which must be 16-byte aligned on v8 11*4882a593Smuzhiyun */ 12*4882a593Smuzhiyun struct cpu_suspend_ctx { 13*4882a593Smuzhiyun /* 14*4882a593Smuzhiyun * This struct must be kept in sync with 15*4882a593Smuzhiyun * cpu_do_{suspend/resume} in mm/proc.S 16*4882a593Smuzhiyun */ 17*4882a593Smuzhiyun u64 ctx_regs[NR_CTX_REGS]; 18*4882a593Smuzhiyun u64 sp; 19*4882a593Smuzhiyun } __aligned(16); 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun /* 22*4882a593Smuzhiyun * Memory to save the cpu state is allocated on the stack by 23*4882a593Smuzhiyun * __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter(). 24*4882a593Smuzhiyun * This data must survive until cpu_resume() is called. 25*4882a593Smuzhiyun * 26*4882a593Smuzhiyun * This struct desribes the size and the layout of the saved cpu state. 27*4882a593Smuzhiyun * The layout of the callee_saved_regs is defined by the implementation 28*4882a593Smuzhiyun * of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed 29*4882a593Smuzhiyun * in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it 30*4882a593Smuzhiyun * returns, and the data would be subsequently corrupted by the call to the 31*4882a593Smuzhiyun * finisher. 32*4882a593Smuzhiyun */ 33*4882a593Smuzhiyun struct sleep_stack_data { 34*4882a593Smuzhiyun struct cpu_suspend_ctx system_regs; 35*4882a593Smuzhiyun unsigned long callee_saved_regs[NR_CALLEE_SAVED_REGS]; 36*4882a593Smuzhiyun }; 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun extern unsigned long *sleep_save_stash; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)); 41*4882a593Smuzhiyun extern void cpu_resume(void); 42*4882a593Smuzhiyun int __cpu_suspend_enter(struct sleep_stack_data *state); 43*4882a593Smuzhiyun void __cpu_suspend_exit(void); 44*4882a593Smuzhiyun void _cpu_resume(void); 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun int swsusp_arch_suspend(void); 47*4882a593Smuzhiyun int swsusp_arch_resume(void); 48*4882a593Smuzhiyun int arch_hibernation_header_save(void *addr, unsigned int max_size); 49*4882a593Smuzhiyun int arch_hibernation_header_restore(void *addr); 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun /* Used to resume on the CPU we hibernated on */ 52*4882a593Smuzhiyun int hibernate_resume_nonboot_cpu_disable(void); 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun #endif 55