126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
|
|
* 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 <linux/init.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/sigcontext.h>
|
|
#include <asm/user.h>
|
|
|
|
extern void mxcsr_feature_mask_init(void);
|
|
extern void init_fpu(struct task_struct *);
|
|
|
|
/*
|
|
* FPU lazy state save handling...
|
|
*/
|
|
|
|
/*
|
|
* The "nop" is needed to make the instructions the same
|
|
* length.
|
|
*/
|
|
#define restore_fpu(tsk) \
|
|
alternative_input( \
|
|
"nop ; frstor %1", \
|
|
"fxrstor %1", \
|
|
X86_FEATURE_FXSR, \
|
|
"m" ((tsk)->thread.i387.fxsave))
|
|
|
|
extern void kernel_fpu_begin(void);
|
|
#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)
|
|
|
|
/*
|
|
* These must be called with preempt disabled
|
|
*/
|
|
static inline void __save_init_fpu( struct task_struct *tsk )
|
|
{
|
|
alternative_input(
|
|
"fnsave %1 ; fwait ;" GENERIC_NOP2,
|
|
"fxsave %1 ; fnclex",
|
|
X86_FEATURE_FXSR,
|
|
"m" (tsk->thread.i387.fxsave)
|
|
:"memory");
|
|
tsk->thread_info->status &= ~TS_USEDFPU;
|
|
}
|
|
|
|
#define __unlazy_fpu( tsk ) do { \
|
|
if ((tsk)->thread_info->status & TS_USEDFPU) \
|
|
save_init_fpu( tsk ); \
|
|
} while (0)
|
|
|
|
#define __clear_fpu( tsk ) \
|
|
do { \
|
|
if ((tsk)->thread_info->status & TS_USEDFPU) { \
|
|
asm volatile("fnclex ; fwait"); \
|
|
(tsk)->thread_info->status &= ~TS_USEDFPU; \
|
|
stts(); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
/*
|
|
* These disable preemption on their own and are safe
|
|
*/
|
|
static inline void save_init_fpu( struct task_struct *tsk )
|
|
{
|
|
preempt_disable();
|
|
__save_init_fpu(tsk);
|
|
stts();
|
|
preempt_enable();
|
|
}
|
|
|
|
#define unlazy_fpu( tsk ) do { \
|
|
preempt_disable(); \
|
|
__unlazy_fpu(tsk); \
|
|
preempt_enable(); \
|
|
} while (0)
|
|
|
|
#define clear_fpu( tsk ) do { \
|
|
preempt_disable(); \
|
|
__clear_fpu( tsk ); \
|
|
preempt_enable(); \
|
|
} 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_mxcsr( struct task_struct *tsk );
|
|
|
|
/*
|
|
* Signal frame handlers...
|
|
*/
|
|
extern int save_i387( struct _fpstate __user *buf );
|
|
extern int restore_i387( struct _fpstate __user *buf );
|
|
|
|
/*
|
|
* ptrace request handers...
|
|
*/
|
|
extern int get_fpregs( struct user_i387_struct __user *buf,
|
|
struct task_struct *tsk );
|
|
extern int set_fpregs( struct task_struct *tsk,
|
|
struct user_i387_struct __user *buf );
|
|
|
|
extern int get_fpxregs( struct user_fxsr_struct __user *buf,
|
|
struct task_struct *tsk );
|
|
extern int set_fpxregs( struct task_struct *tsk,
|
|
struct user_fxsr_struct __user *buf );
|
|
|
|
/*
|
|
* FPU state for core dumps...
|
|
*/
|
|
extern int dump_fpu( struct pt_regs *regs,
|
|
struct user_i387_struct *fpu );
|
|
|
|
#endif /* __ASM_I386_I387_H */
|