Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Lorenzo Pieralisi | 6732bc6 | 2013-07-17 10:14:45 +0100 | [diff] [blame] | 2 | #ifndef __ASM_SUSPEND_H |
| 3 | #define __ASM_SUSPEND_H |
| 4 | |
Mark Rutland | 623b476 | 2016-11-03 20:23:09 +0000 | [diff] [blame] | 5 | #define NR_CTX_REGS 12 |
James Morse | adc9b2d | 2016-04-27 17:47:06 +0100 | [diff] [blame] | 6 | #define NR_CALLEE_SAVED_REGS 12 |
Lorenzo Pieralisi | 6732bc6 | 2013-07-17 10:14:45 +0100 | [diff] [blame] | 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); |
Lorenzo Pieralisi | 9532252 | 2013-07-22 12:22:13 +0100 | [diff] [blame] | 20 | |
James Morse | adc9b2d | 2016-04-27 17:47:06 +0100 | [diff] [blame] | 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 | |
James Morse | cabe1c8 | 2016-04-27 17:47:07 +0100 | [diff] [blame] | 38 | extern unsigned long *sleep_save_stash; |
| 39 | |
Sudeep Holla | af391b1 | 2015-06-18 15:41:32 +0100 | [diff] [blame] | 40 | extern int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)); |
Lorenzo Pieralisi | 9532252 | 2013-07-22 12:22:13 +0100 | [diff] [blame] | 41 | extern void cpu_resume(void); |
James Morse | adc9b2d | 2016-04-27 17:47:06 +0100 | [diff] [blame] | 42 | int __cpu_suspend_enter(struct sleep_stack_data *state); |
| 43 | void __cpu_suspend_exit(void); |
James Morse | 82869ac | 2016-04-27 17:47:12 +0100 | [diff] [blame] | 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 | |
James Morse | 8ec058f | 2016-08-17 13:50:26 +0100 | [diff] [blame] | 51 | /* Used to resume on the CPU we hibernated on */ |
| 52 | int hibernate_resume_nonboot_cpu_disable(void); |
| 53 | |
Lorenzo Pieralisi | 6732bc6 | 2013-07-17 10:14:45 +0100 | [diff] [blame] | 54 | #endif |