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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [i387.h] - Blame information for rev 1765

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/*
 * include/asm-x86_64/i387.h
 *
 * Copyright (C) 1994 Linus Torvalds
 *
 * Pentium III FXSR, SSE support
 * General FPU state handling cleanups
 *      Gareth Hughes <gareth@valinux.com>, May 2000
 * x86-64 work by Andi Kleen 2002
 */
 
#ifndef __ASM_X86_64_I387_H
#define __ASM_X86_64_I387_H
 
#include <linux/sched.h>
#include <asm/processor.h>
#include <asm/sigcontext.h>
#include <asm/user.h>
#include <asm/uaccess.h>
 
extern void init_fpu(struct task_struct *child);
extern int save_i387(struct _fpstate *buf);
 
/*
 * FPU lazy state save handling...
 */
 
#define kernel_fpu_end() stts()
 
#define unlazy_fpu( tsk ) do { \
        if ( tsk->flags & PF_USEDFPU ) \
                save_init_fpu( tsk ); \
} while (0)
 
#define clear_fpu( tsk ) do { \
        if ( tsk->flags & PF_USEDFPU ) { \
                asm volatile("fwait"); \
                tsk->flags &= ~PF_USEDFPU; \
                stts(); \
        } \
} while (0)
 
#define load_mxcsr( val ) do { \
                unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \
                asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \
} while (0)
 
/*
 * ptrace request handers...
 */
extern int get_fpregs( struct user_i387_struct *buf,
                       struct task_struct *tsk );
extern int set_fpregs( struct task_struct *tsk,
                       struct user_i387_struct *buf );
 
/*
 * FPU state for core dumps...
 */
extern int dump_fpu( struct pt_regs *regs,
                     struct user_i387_struct *fpu );
 
/*
 * i387 state interaction
 */
#define get_fpu_mxcsr(t) ((t)->thread.i387.fxsave.mxcsr)
#define get_fpu_cwd(t) ((t)->thread.i387.fxsave.cwd)
#define get_fpu_fxsr_twd(t) ((t)->thread.i387.fxsave.twd)
#define get_fpu_swd(t) ((t)->thread.i387.fxsave.swd)
#define set_fpu_cwd(t,val) ((t)->thread.i387.fxsave.cwd = (val))
#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val))
#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val))
#define set_fpu_mxcsr(t,val) ((t)->thread.i387.fxsave.mxcsr = (val)&0xffbf)
 
static inline int restore_fpu_checking(struct i387_fxsave_struct *fx)
{
        int err;
        asm volatile("1:  rex64 ; fxrstor (%[fx])\n\t"
                     "2:\n"
                     ".section .fixup,\"ax\"\n"
                     "3:  movl $-1,%[err]\n"
                     "    jmp  2b\n"
                     ".previous\n"
                     ".section __ex_table,\"a\"\n"
                     "   .align 8\n"
                     "   .quad  1b,3b\n"
                     ".previous"
                     : [err] "=r" (err)
                     : [fx] "r" (fx), "0" (0));
        if (unlikely(err))
                init_fpu(current);
        return err;
}
 
static inline int save_i387_checking(struct i387_fxsave_struct *fx)
{
        int err;
        asm volatile("1:  rex64 ; fxsave (%[fx])\n\t"
                     "2:\n"
                     ".section .fixup,\"ax\"\n"
                     "3:  movl $-1,%[err]\n"
                     "    jmp  2b\n"
                     ".previous\n"
                     ".section __ex_table,\"a\"\n"
                     "   .align 8\n"
                     "   .quad  1b,3b\n"
                     ".previous"
                     : [err] "=r" (err)
                     : [fx] "r" (fx), "0" (0));
        if (unlikely(err))
                __clear_user(fx, sizeof(struct i387_fxsave_struct));
        return err;
}
 
static inline void kernel_fpu_begin(void)
{
        struct task_struct *tsk = current;
        if (tsk->flags & PF_USEDFPU) {
                asm volatile("rex64 ; fxsave %0 ; fnclex"
                              : "=m" (tsk->thread.i387.fxsave));
                tsk->flags &= ~PF_USEDFPU;
                return;
        }
        clts();
}
 
static inline void save_init_fpu( struct task_struct *tsk )
{
        asm volatile( "fxsave %0 ; fnclex"
                      : "=m" (tsk->thread.i387.fxsave));
        tsk->flags &= ~PF_USEDFPU;
        stts();
}
 
/*
 * This restores directly out of user space. Exceptions are handled.
 */
static inline int restore_i387(struct _fpstate *buf)
{
        return restore_fpu_checking((struct i387_fxsave_struct *)buf);
}
 
#endif /* __ASM_X86_64_I387_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* include/asm-x86_64/i387.h`
3			`*`
4			`* Copyright (C) 1994 Linus Torvalds`
5			`*`
6			`* Pentium III FXSR, SSE support`
7			`* General FPU state handling cleanups`
8			`* Gareth Hughes <gareth@valinux.com>, May 2000`
9			`* x86-64 work by Andi Kleen 2002`
10			`*/`
11
12			`#ifndef __ASM_X86_64_I387_H`
13			`#define __ASM_X86_64_I387_H`
14
15			`#include <linux/sched.h>`
16			`#include <asm/processor.h>`
17			`#include <asm/sigcontext.h>`
18			`#include <asm/user.h>`
19			`#include <asm/uaccess.h>`
20
21			`extern void init_fpu(struct task_struct *child);`
22			`extern int save_i387(struct _fpstate *buf);`
23
24			`/*`
25			`* FPU lazy state save handling...`
26			`*/`
27
28			`#define kernel_fpu_end() stts()`
29
30			`#define unlazy_fpu( tsk ) do { \`
31			`if ( tsk->flags & PF_USEDFPU ) \`
32			`save_init_fpu( tsk ); \`
33			`} while (0)`
34
35			`#define clear_fpu( tsk ) do { \`
36			`if ( tsk->flags & PF_USEDFPU ) { \`
37			`asm volatile("fwait"); \`
38			`tsk->flags &= ~PF_USEDFPU; \`
39			`stts(); \`
40			`} \`
41			`} while (0)`
42
43			`#define load_mxcsr( val ) do { \`
44			`unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \`
45			`asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \`
46			`} while (0)`
47
48			`/*`
49			`* ptrace request handers...`
50			`*/`
51			`extern int get_fpregs( struct user_i387_struct *buf,`
52			`struct task_struct *tsk );`
53			`extern int set_fpregs( struct task_struct *tsk,`
54			`struct user_i387_struct *buf );`
55
56			`/*`
57			`* FPU state for core dumps...`
58			`*/`
59			`extern int dump_fpu( struct pt_regs *regs,`
60			`struct user_i387_struct *fpu );`
61
62			`/*`
63			`* i387 state interaction`
64			`*/`
65			`#define get_fpu_mxcsr(t) ((t)->thread.i387.fxsave.mxcsr)`
66			`#define get_fpu_cwd(t) ((t)->thread.i387.fxsave.cwd)`
67			`#define get_fpu_fxsr_twd(t) ((t)->thread.i387.fxsave.twd)`
68			`#define get_fpu_swd(t) ((t)->thread.i387.fxsave.swd)`
69			`#define set_fpu_cwd(t,val) ((t)->thread.i387.fxsave.cwd = (val))`
70			`#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val))`
71			`#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val))`
72			`#define set_fpu_mxcsr(t,val) ((t)->thread.i387.fxsave.mxcsr = (val)&0xffbf)`
73
74			`static inline int restore_fpu_checking(struct i387_fxsave_struct *fx)`
75			`{`
76			`int err;`
77			`asm volatile("1: rex64 ; fxrstor (%[fx])\n\t"`
78			`"2:\n"`
79			`".section .fixup,\"ax\"\n"`
80			`"3: movl $-1,%[err]\n"`
81			`" jmp 2b\n"`
82			`".previous\n"`
83			`".section __ex_table,\"a\"\n"`
84			`" .align 8\n"`
85			`" .quad 1b,3b\n"`
86			`".previous"`
87			`: [err] "=r" (err)`
88			`: [fx] "r" (fx), "0" (0));`
89			`if (unlikely(err))`
90			`init_fpu(current);`
91			`return err;`
92			`}`
93
94			`static inline int save_i387_checking(struct i387_fxsave_struct *fx)`
95			`{`
96			`int err;`
97			`asm volatile("1: rex64 ; fxsave (%[fx])\n\t"`
98			`"2:\n"`
99			`".section .fixup,\"ax\"\n"`
100			`"3: movl $-1,%[err]\n"`
101			`" jmp 2b\n"`
102			`".previous\n"`
103			`".section __ex_table,\"a\"\n"`
104			`" .align 8\n"`
105			`" .quad 1b,3b\n"`
106			`".previous"`
107			`: [err] "=r" (err)`
108			`: [fx] "r" (fx), "0" (0));`
109			`if (unlikely(err))`
110			`__clear_user(fx, sizeof(struct i387_fxsave_struct));`
111			`return err;`
112			`}`
113
114			`static inline void kernel_fpu_begin(void)`
115			`{`
116			`struct task_struct *tsk = current;`
117			`if (tsk->flags & PF_USEDFPU) {`
118			`asm volatile("rex64 ; fxsave %0 ; fnclex"`
119			`: "=m" (tsk->thread.i387.fxsave));`
120			`tsk->flags &= ~PF_USEDFPU;`
121			`return;`
122			`}`
123			`clts();`
124			`}`
125
126			`static inline void save_init_fpu( struct task_struct *tsk )`
127			`{`
128			`asm volatile( "fxsave %0 ; fnclex"`
129			`: "=m" (tsk->thread.i387.fxsave));`
130			`tsk->flags &= ~PF_USEDFPU;`
131			`stts();`
132			`}`
133
134			`/*`
135			`* This restores directly out of user space. Exceptions are handled.`
136			`*/`
137			`static inline int restore_i387(struct _fpstate *buf)`
138			`{`
139			`return restore_fpu_checking((struct i387_fxsave_struct *)buf);`
140			`}`
141
142			`#endif /* __ASM_X86_64_I387_H */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [i387.h] - Blame information for rev 1765