1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 26732bc65SLorenzo Pieralisi #ifndef __ASM_SUSPEND_H 36732bc65SLorenzo Pieralisi #define __ASM_SUSPEND_H 46732bc65SLorenzo Pieralisi 5*6d37d81fSSami Tolvanen #define NR_CTX_REGS 13 6adc9b2dfSJames Morse #define NR_CALLEE_SAVED_REGS 12 76732bc65SLorenzo Pieralisi 86732bc65SLorenzo Pieralisi /* 96732bc65SLorenzo Pieralisi * struct cpu_suspend_ctx must be 16-byte aligned since it is allocated on 106732bc65SLorenzo Pieralisi * the stack, which must be 16-byte aligned on v8 116732bc65SLorenzo Pieralisi */ 126732bc65SLorenzo Pieralisi struct cpu_suspend_ctx { 136732bc65SLorenzo Pieralisi /* 146732bc65SLorenzo Pieralisi * This struct must be kept in sync with 156732bc65SLorenzo Pieralisi * cpu_do_{suspend/resume} in mm/proc.S 166732bc65SLorenzo Pieralisi */ 176732bc65SLorenzo Pieralisi u64 ctx_regs[NR_CTX_REGS]; 186732bc65SLorenzo Pieralisi u64 sp; 196732bc65SLorenzo Pieralisi } __aligned(16); 2095322526SLorenzo Pieralisi 21adc9b2dfSJames Morse /* 22adc9b2dfSJames Morse * Memory to save the cpu state is allocated on the stack by 23adc9b2dfSJames Morse * __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter(). 24adc9b2dfSJames Morse * This data must survive until cpu_resume() is called. 25adc9b2dfSJames Morse * 26adc9b2dfSJames Morse * This struct desribes the size and the layout of the saved cpu state. 27adc9b2dfSJames Morse * The layout of the callee_saved_regs is defined by the implementation 28adc9b2dfSJames Morse * of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed 29adc9b2dfSJames Morse * in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it 30adc9b2dfSJames Morse * returns, and the data would be subsequently corrupted by the call to the 31adc9b2dfSJames Morse * finisher. 32adc9b2dfSJames Morse */ 33adc9b2dfSJames Morse struct sleep_stack_data { 34adc9b2dfSJames Morse struct cpu_suspend_ctx system_regs; 35adc9b2dfSJames Morse unsigned long callee_saved_regs[NR_CALLEE_SAVED_REGS]; 36adc9b2dfSJames Morse }; 37adc9b2dfSJames Morse 38cabe1c81SJames Morse extern unsigned long *sleep_save_stash; 39cabe1c81SJames Morse 40af391b15SSudeep Holla extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)); 4195322526SLorenzo Pieralisi extern void cpu_resume(void); 42adc9b2dfSJames Morse int __cpu_suspend_enter(struct sleep_stack_data *state); 43adc9b2dfSJames Morse void __cpu_suspend_exit(void); 4482869ac5SJames Morse void _cpu_resume(void); 4582869ac5SJames Morse 4682869ac5SJames Morse int swsusp_arch_suspend(void); 4782869ac5SJames Morse int swsusp_arch_resume(void); 4882869ac5SJames Morse int arch_hibernation_header_save(void *addr, unsigned int max_size); 4982869ac5SJames Morse int arch_hibernation_header_restore(void *addr); 5082869ac5SJames Morse 518ec058fdSJames Morse /* Used to resume on the CPU we hibernated on */ 528ec058fdSJames Morse int hibernate_resume_nonboot_cpu_disable(void); 538ec058fdSJames Morse 546732bc65SLorenzo Pieralisi #endif 55