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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/fpu.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_FPU_H

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#define __ASM_SH_FPU_H

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#ifndef __ASSEMBLER__

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#include <asm/ptrace.h>

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struct task_struct;

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#ifdef CONFIG_SH_FPU

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static inline void release_fpu(struct pt_regs *regs)

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{

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	regs->sr |= SR_FD;

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}

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static inline void grab_fpu(struct pt_regs *regs)

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{

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	regs->sr &= ~SR_FD;

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}

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extern void save_fpu(struct task_struct *__tsk);

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extern void restore_fpu(struct task_struct *__tsk);

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extern void fpu_state_restore(struct pt_regs *regs);

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extern void __fpu_state_restore(void);

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#else

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#define save_fpu(tsk)			do { } while (0)

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#define restore_fpu(tsk)		do { } while (0)

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#define release_fpu(regs)		do { } while (0)

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#define grab_fpu(regs)			do { } while (0)

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#define fpu_state_restore(regs)		do { } while (0)

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#define __fpu_state_restore(regs)	do { } while (0)

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#endif

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struct user_regset;

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extern int do_fpu_inst(unsigned short, struct pt_regs *);

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extern int init_fpu(struct task_struct *);

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static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)

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{

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	if (task_thread_info(tsk)->status & TS_USEDFPU) {

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		task_thread_info(tsk)->status &= ~TS_USEDFPU;

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		save_fpu(tsk);

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		release_fpu(regs);

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	} else

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		tsk->thread.fpu_counter = 0;

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}

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static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)

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{

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	preempt_disable();

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	__unlazy_fpu(tsk, regs);

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	preempt_enable();

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}

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static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)

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{

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	preempt_disable();

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	if (task_thread_info(tsk)->status & TS_USEDFPU) {

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		task_thread_info(tsk)->status &= ~TS_USEDFPU;

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		release_fpu(regs);

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	}

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	preempt_enable();

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}

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void float_raise(unsigned int flags);

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int float_rounding_mode(void);

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#endif /* __ASSEMBLER__ */

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#endif /* __ASM_SH_FPU_H */

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