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 void mxcsr_feature_mask_init(void);
21 extern void init_fpu(struct task_struct *);
24 * FPU lazy state save handling...
28 * The "nop" is needed to make the instructions the same
31 #define restore_fpu(tsk) \
36 "m" ((tsk)->thread.i387.fsave))
38 extern void kernel_fpu_begin(void);
39 #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
42 * These must be called with preempt disabled
44 static inline void __save_init_fpu( struct task_struct *tsk )
47 asm volatile( "fxsave %0 ; fnclex"
48 : "=m" (tsk->thread.i387.fxsave) );
50 asm volatile( "fnsave %0 ; fwait"
51 : "=m" (tsk->thread.i387.fsave) );
53 tsk->thread_info->status &= ~TS_USEDFPU;
56 #define __unlazy_fpu( tsk ) do { \
57 if ((tsk)->thread_info->status & TS_USEDFPU) \
58 save_init_fpu( tsk ); \
61 #define __clear_fpu( tsk ) \
63 if ((tsk)->thread_info->status & TS_USEDFPU) { \
64 asm volatile("fnclex ; fwait"); \
65 (tsk)->thread_info->status &= ~TS_USEDFPU; \
72 * These disable preemption on their own and are safe
74 static inline void save_init_fpu( struct task_struct *tsk )
82 #define unlazy_fpu( tsk ) do { \
88 #define clear_fpu( tsk ) do { \
95 * FPU state interaction...
97 extern unsigned short get_fpu_cwd( struct task_struct *tsk );
98 extern unsigned short get_fpu_swd( struct task_struct *tsk );
99 extern unsigned short get_fpu_mxcsr( struct task_struct *tsk );
102 * Signal frame handlers...
104 extern int save_i387( struct _fpstate __user *buf );
105 extern int restore_i387( struct _fpstate __user *buf );
108 * ptrace request handers...
110 extern int get_fpregs( struct user_i387_struct __user *buf,
111 struct task_struct *tsk );
112 extern int set_fpregs( struct task_struct *tsk,
113 struct user_i387_struct __user *buf );
115 extern int get_fpxregs( struct user_fxsr_struct __user *buf,
116 struct task_struct *tsk );
117 extern int set_fpxregs( struct task_struct *tsk,
118 struct user_fxsr_struct __user *buf );
121 * FPU state for core dumps...
123 extern int dump_fpu( struct pt_regs *regs,
124 struct user_i387_struct *fpu );
126 #endif /* __ASM_I386_I387_H */