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 <linux/init.h>
16 #include <asm/processor.h>
17 #include <asm/sigcontext.h>
20 extern unsigned long mxcsr_feature_mask;
21 extern void mxcsr_feature_mask_init(void);
22 extern void init_fpu(struct task_struct *);
24 * FPU lazy state save handling...
26 extern void restore_fpu( struct task_struct *tsk );
28 extern void kernel_fpu_begin(void);
29 #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
32 * These must be called with preempt disabled
34 static inline void __save_init_fpu( struct task_struct *tsk )
37 asm volatile( "fxsave %0 ; fnclex"
38 : "=m" (tsk->thread.i387.fxsave) );
40 asm volatile( "fnsave %0 ; fwait"
41 : "=m" (tsk->thread.i387.fsave) );
43 tsk->thread_info->status &= ~TS_USEDFPU;
46 #define __unlazy_fpu( tsk ) do { \
47 if ((tsk)->thread_info->status & TS_USEDFPU) \
48 save_init_fpu( tsk ); \
51 #define __clear_fpu( tsk ) \
53 if ((tsk)->thread_info->status & TS_USEDFPU) { \
54 asm volatile("fwait"); \
55 (tsk)->thread_info->status &= ~TS_USEDFPU; \
62 * These disable preemption on their own and are safe
64 static inline void save_init_fpu( struct task_struct *tsk )
72 #define unlazy_fpu( tsk ) do { \
78 #define clear_fpu( tsk ) do { \
85 * FPU state interaction...
87 extern unsigned short get_fpu_cwd( struct task_struct *tsk );
88 extern unsigned short get_fpu_swd( struct task_struct *tsk );
89 extern unsigned short get_fpu_twd( struct task_struct *tsk );
90 extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
92 extern void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd );
93 extern void set_fpu_swd( struct task_struct *tsk, unsigned short swd );
94 extern void set_fpu_twd( struct task_struct *tsk, unsigned short twd );
97 * Signal frame handlers...
99 extern int save_i387( struct _fpstate __user *buf );
100 extern int restore_i387( struct _fpstate __user *buf );
103 * ptrace request handers...
105 extern int get_fpregs( struct user_i387_struct __user *buf,
106 struct task_struct *tsk );
107 extern int set_fpregs( struct task_struct *tsk,
108 struct user_i387_struct __user *buf );
110 extern int get_fpxregs( struct user_fxsr_struct __user *buf,
111 struct task_struct *tsk );
112 extern int set_fpxregs( struct task_struct *tsk,
113 struct user_fxsr_struct __user *buf );
116 * FPU state for core dumps...
118 extern int dump_fpu( struct pt_regs *regs,
119 struct user_i387_struct *fpu );
120 extern int dump_extended_fpu( struct pt_regs *regs,
121 struct user_fxsr_struct *fpu );
123 #endif /* __ASM_I386_I387_H */