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116 lines
2.7 KiB
116 lines
2.7 KiB
20 years ago
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/*
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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 <linux/init.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 mxcsr_feature_mask_init(void);
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extern void init_fpu(struct task_struct *);
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/*
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* FPU lazy state save handling...
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*/
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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() do { stts(); preempt_enable(); } while(0)
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/*
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* These must be called with preempt disabled
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*/
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static inline void __save_init_fpu( struct task_struct *tsk )
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{
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if ( cpu_has_fxsr ) {
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asm volatile( "fxsave %0 ; fnclex"
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: "=m" (tsk->thread.i387.fxsave) );
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} else {
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asm volatile( "fnsave %0 ; fwait"
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: "=m" (tsk->thread.i387.fsave) );
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}
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tsk->thread_info->status &= ~TS_USEDFPU;
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}
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#define __unlazy_fpu( tsk ) do { \
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if ((tsk)->thread_info->status & TS_USEDFPU) \
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save_init_fpu( tsk ); \
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} while (0)
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#define __clear_fpu( tsk ) \
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do { \
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if ((tsk)->thread_info->status & TS_USEDFPU) { \
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asm volatile("fnclex ; fwait"); \
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(tsk)->thread_info->status &= ~TS_USEDFPU; \
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stts(); \
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} \
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} while (0)
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/*
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* These disable preemption on their own and are safe
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*/
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static inline void save_init_fpu( struct task_struct *tsk )
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{
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preempt_disable();
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__save_init_fpu(tsk);
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stts();
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preempt_enable();
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}
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#define unlazy_fpu( tsk ) do { \
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preempt_disable(); \
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__unlazy_fpu(tsk); \
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preempt_enable(); \
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} while (0)
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#define clear_fpu( tsk ) do { \
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preempt_disable(); \
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__clear_fpu( tsk ); \
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preempt_enable(); \
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} while (0)
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\
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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_mxcsr( struct task_struct *tsk );
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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 __user *buf );
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extern int restore_i387( struct _fpstate __user *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 __user *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 __user *buf );
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extern int get_fpxregs( struct user_fxsr_struct __user *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 __user *buf );
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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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#endif /* __ASM_I386_I387_H */
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