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