| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| #ifndef _ASM_SWITCH_TO_H |
| #define _ASM_SWITCH_TO_H |
| |
| #include <asm/cpu-features.h> |
| #include <asm/fpu.h> |
| |
| struct task_struct; |
| |
| /** |
| * __switch_to - switch execution of a task |
| * @prev: The task previously executed. |
| * @next: The task to begin executing. |
| * @next_ti: task_thread_info(next). |
| * @sched_ra: __schedule return address. |
| * @sched_cfa: __schedule call frame address. |
| * |
| * This function is used whilst scheduling to save the context of prev & load |
| * the context of next. Returns prev. |
| */ |
| extern asmlinkage struct task_struct *__switch_to(struct task_struct *prev, |
| struct task_struct *next, struct thread_info *next_ti, |
| void *sched_ra, void *sched_cfa); |
| |
| /* |
| * For newly created kernel threads switch_to() will return to |
| * ret_from_kernel_thread, newly created user threads to ret_from_fork. |
| * That is, everything following __switch_to() will be skipped for new threads. |
| * So everything that matters to new threads should be placed before __switch_to(). |
| */ |
| #define switch_to(prev, next, last) \ |
| do { \ |
| lose_fpu_inatomic(1, prev); \ |
| hw_breakpoint_thread_switch(next); \ |
| (last) = __switch_to(prev, next, task_thread_info(next), \ |
| __builtin_return_address(0), __builtin_frame_address(0)); \ |
| } while (0) |
| |
| #endif /* _ASM_SWITCH_TO_H */ |