43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* 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 */
|