/* 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> #include <asm/lbt.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); \ lose_lbt_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 */