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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012 Regents of the University of California */ #ifndef _ASM_RISCV_SWITCH_TO_H #define _ASM_RISCV_SWITCH_TO_H #include <linux/sched/task_stack.h> #include <asm/processor.h> #include <asm/ptrace.h> #include <asm/csr.h> #ifdef CONFIG_FPU extern void __fstate_save(struct task_struct *save_to); extern void __fstate_restore(struct task_struct *restore_from); static inline void __fstate_clean(struct pt_regs *regs) { regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_CLEAN; } static inline void fstate_off(struct task_struct *task, struct pt_regs *regs) { regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_OFF; } static inline void fstate_save(struct task_struct *task, struct pt_regs *regs) { if ((regs->sstatus & SR_FS) == SR_FS_DIRTY) { __fstate_save(task); __fstate_clean(regs); } } static inline void fstate_restore(struct task_struct *task, struct pt_regs *regs) { if ((regs->sstatus & SR_FS) != SR_FS_OFF) { __fstate_restore(task); __fstate_clean(regs); } } static inline void __switch_to_aux(struct task_struct *prev, struct task_struct *next) { struct pt_regs *regs; regs = task_pt_regs(prev); if (unlikely(regs->sstatus & SR_SD)) fstate_save(prev, regs); fstate_restore(next, task_pt_regs(next)); } extern bool has_fpu; #else #define has_fpu false #define fstate_save(task, regs) do { } while (0) #define fstate_restore(task, regs) do { } while (0) #define __switch_to_aux(__prev, __next) do { } while (0) #endif extern struct task_struct *__switch_to(struct task_struct *, struct task_struct *); #define switch_to(prev, next, last) \ do { \ struct task_struct *__prev = (prev); \ struct task_struct *__next = (next); \ if (has_fpu) \ __switch_to_aux(__prev, __next); \ ((last) = __switch_to(__prev, __next)); \ } while (0) #endif /* _ASM_RISCV_SWITCH_TO_H */
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