2 * include/asm-i386/i387.h
4 * Copyright (C) 1994 Linus Torvalds
6 * Pentium III FXSR, SSE support
7 * General FPU state handling cleanups
8 * Gareth Hughes <gareth@valinux.com>, May 2000
11 #ifndef __ASM_I386_I387_H
12 #define __ASM_I386_I387_H
14 #include <linux/sched.h>
15 #include <asm/processor.h>
16 #include <asm/sigcontext.h>
19 extern void init_fpu(void);
21 * FPU lazy state save handling...
23 extern void save_init_fpu( struct task_struct *tsk );
24 extern void restore_fpu( struct task_struct *tsk );
26 extern void kernel_fpu_begin(void);
27 #define kernel_fpu_end() stts()
30 #define unlazy_fpu( tsk ) do { \
31 if ( tsk->flags & PF_USEDFPU ) \
32 save_init_fpu( tsk ); \
35 #define clear_fpu( tsk ) do { \
36 if ( tsk->flags & PF_USEDFPU ) { \
37 asm volatile("fnclex ; fwait"); \
38 tsk->flags &= ~PF_USEDFPU; \
44 * FPU state interaction...
46 extern unsigned short get_fpu_cwd( struct task_struct *tsk );
47 extern unsigned short get_fpu_swd( struct task_struct *tsk );
48 extern unsigned short get_fpu_twd( struct task_struct *tsk );
49 extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
51 extern void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd );
52 extern void set_fpu_swd( struct task_struct *tsk, unsigned short swd );
53 extern void set_fpu_twd( struct task_struct *tsk, unsigned short twd );
54 extern void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr );
56 #define load_mxcsr( val ) do { \
57 unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \
58 asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \
62 * Signal frame handlers...
64 extern int save_i387( struct _fpstate *buf );
65 extern int restore_i387( struct _fpstate *buf );
68 * ptrace request handers...
70 extern int get_fpregs( struct user_i387_struct *buf,
71 struct task_struct *tsk );
72 extern int set_fpregs( struct task_struct *tsk,
73 struct user_i387_struct *buf );
75 extern int get_fpxregs( struct user_fxsr_struct *buf,
76 struct task_struct *tsk );
77 extern int set_fpxregs( struct task_struct *tsk,
78 struct user_fxsr_struct *buf );
79 extern void load_empty_fpu(struct task_struct *);
82 * FPU state for core dumps...
84 extern int dump_fpu( struct pt_regs *regs,
85 struct user_i387_struct *fpu );
86 extern int dump_extended_fpu( struct pt_regs *regs,
87 struct user_fxsr_struct *fpu );
89 #endif /* __ASM_I386_I387_H */