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1275 |
phoenix |
/*
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* include/asm-i386/i387.h
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*
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* Copyright (C) 1994 Linus Torvalds
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*
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* Pentium III FXSR, SSE support
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* General FPU state handling cleanups
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*/
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#ifndef __ASM_I386_I387_H
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#define __ASM_I386_I387_H
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/sigcontext.h>
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#include <asm/user.h>
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extern void init_fpu(void);
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/*
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* FPU lazy state save handling...
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*/
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extern void save_init_fpu( struct task_struct *tsk );
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extern void restore_fpu( struct task_struct *tsk );
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extern void kernel_fpu_begin(void);
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#define kernel_fpu_end() stts()
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#define unlazy_fpu( tsk ) do { \
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if ( tsk->flags & PF_USEDFPU ) \
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save_init_fpu( tsk ); \
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} while (0)
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#define clear_fpu( tsk ) do { \
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if ( tsk->flags & PF_USEDFPU ) { \
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asm volatile("fwait"); \
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tsk->flags &= ~PF_USEDFPU; \
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stts(); \
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} \
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} while (0)
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/*
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* FPU state interaction...
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*/
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extern unsigned short get_fpu_cwd( struct task_struct *tsk );
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extern unsigned short get_fpu_swd( struct task_struct *tsk );
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extern unsigned short get_fpu_twd( struct task_struct *tsk );
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extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
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extern void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd );
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extern void set_fpu_swd( struct task_struct *tsk, unsigned short swd );
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extern void set_fpu_twd( struct task_struct *tsk, unsigned short twd );
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extern void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr );
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#define load_mxcsr( val ) do { \
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unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \
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asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \
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} while (0)
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/*
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* Signal frame handlers...
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*/
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extern int save_i387( struct _fpstate *buf );
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extern int restore_i387( struct _fpstate *buf );
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/*
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* ptrace request handers...
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*/
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extern int get_fpregs( struct user_i387_struct *buf,
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struct task_struct *tsk );
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extern int set_fpregs( struct task_struct *tsk,
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struct user_i387_struct *buf );
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extern int get_fpxregs( struct user_fxsr_struct *buf,
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struct task_struct *tsk );
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extern int set_fpxregs( struct task_struct *tsk,
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struct user_fxsr_struct *buf );
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extern void load_empty_fpu(struct task_struct *);
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/*
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* FPU state for core dumps...
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*/
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extern int dump_fpu( struct pt_regs *regs,
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struct user_i387_struct *fpu );
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extern int dump_extended_fpu( struct pt_regs *regs,
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struct user_fxsr_struct *fpu );
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#endif /* __ASM_I386_I387_H */
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