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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * include/asm-i386/i387.h |
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| 3 | * |
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| 4 | * Copyright (C) 1994 Linus Torvalds |
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| 5 | * |
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| 6 | * Pentium III FXSR, SSE support |
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| 7 | * General FPU state handling cleanups |
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| 8 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
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| 9 | */ |
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| 10 | |||
| 11 | #ifndef __ASM_I386_I387_H |
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| 12 | #define __ASM_I386_I387_H |
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| 13 | |||
| 14 | #include <linux/sched.h> |
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| 15 | #include <asm/processor.h> |
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| 16 | #include <asm/sigcontext.h> |
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| 17 | #include <asm/user.h> |
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| 18 | |||
| 19 | extern void init_fpu(struct task_struct *); |
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| 20 | /* |
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| 21 | * FPU lazy state save handling... |
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| 22 | */ |
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| 23 | extern void restore_fpu( struct task_struct *tsk ); |
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| 24 | |||
| 25 | extern void kernel_fpu_begin(void); |
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| 26 | #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0) |
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| 27 | |||
| 28 | /* |
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| 29 | * These must be called with preempt disabled |
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| 30 | */ |
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| 31 | static inline void __save_init_fpu( struct task_struct *tsk ) |
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| 32 | { |
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| 33 | if ( cpu_has_fxsr ) { |
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| 34 | asm volatile( "fxsave %0 ; fnclex" |
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| 35 | : "=m" (tsk->thread.i387.fxsave) ); |
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| 36 | } else { |
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| 37 | asm volatile( "fnsave %0 ; fwait" |
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| 38 | : "=m" (tsk->thread.i387.fsave) ); |
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| 39 | } |
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| 40 | tsk->thread_info->status &= ~TS_USEDFPU; |
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| 41 | } |
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| 42 | |||
| 43 | #define __unlazy_fpu( tsk ) do { \ |
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| 44 | if ((tsk)->thread_info->status & TS_USEDFPU) \ |
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| 45 | save_init_fpu( tsk ); \ |
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| 46 | } while (0) |
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| 47 | |||
| 48 | #define __clear_fpu( tsk ) \ |
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| 49 | do { \ |
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| 50 | if ((tsk)->thread_info->status & TS_USEDFPU) { \ |
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| 51 | asm volatile("fwait"); \ |
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| 52 | (tsk)->thread_info->status &= ~TS_USEDFPU; \ |
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| 53 | stts(); \ |
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| 54 | } \ |
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| 55 | } while (0) |
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| 56 | |||
| 57 | |||
| 58 | /* |
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| 59 | * These disable preemption on their own and are safe |
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| 60 | */ |
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| 61 | static inline void save_init_fpu( struct task_struct *tsk ) |
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| 62 | { |
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| 63 | preempt_disable(); |
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| 64 | __save_init_fpu(tsk); |
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| 65 | stts(); |
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| 66 | preempt_enable(); |
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| 67 | } |
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| 68 | |||
| 69 | #define unlazy_fpu( tsk ) do { \ |
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| 70 | preempt_disable(); \ |
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| 71 | __unlazy_fpu(tsk); \ |
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| 72 | preempt_enable(); \ |
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| 73 | } while (0) |
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| 74 | |||
| 75 | #define clear_fpu( tsk ) do { \ |
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| 76 | preempt_disable(); \ |
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| 77 | __clear_fpu( tsk ); \ |
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| 78 | preempt_enable(); \ |
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| 79 | } while (0) |
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| 80 | \ |
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| 81 | /* |
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| 82 | * FPU state interaction... |
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| 83 | */ |
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| 84 | extern unsigned short get_fpu_cwd( struct task_struct *tsk ); |
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| 85 | extern unsigned short get_fpu_swd( struct task_struct *tsk ); |
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| 86 | extern unsigned short get_fpu_twd( struct task_struct *tsk ); |
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| 87 | extern unsigned short get_fpu_mxcsr( struct task_struct *tsk ); |
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| 88 | |||
| 89 | extern void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd ); |
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| 90 | extern void set_fpu_swd( struct task_struct *tsk, unsigned short swd ); |
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| 91 | extern void set_fpu_twd( struct task_struct *tsk, unsigned short twd ); |
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| 92 | extern void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr ); |
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| 93 | |||
| 94 | #define load_mxcsr( val ) do { \ |
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| 95 | unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \ |
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| 96 | asm volatile( "ldmxcsr %0" : : "m" (__mxcsr) ); \ |
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| 97 | } while (0) |
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| 98 | |||
| 99 | /* |
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| 100 | * Signal frame handlers... |
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| 101 | */ |
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| 102 | extern int save_i387( struct _fpstate __user *buf ); |
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| 103 | extern int restore_i387( struct _fpstate __user *buf ); |
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| 104 | |||
| 105 | /* |
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| 106 | * ptrace request handers... |
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| 107 | */ |
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| 108 | extern int get_fpregs( struct user_i387_struct __user *buf, |
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| 109 | struct task_struct *tsk ); |
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| 110 | extern int set_fpregs( struct task_struct *tsk, |
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| 111 | struct user_i387_struct __user *buf ); |
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| 112 | |||
| 113 | extern int get_fpxregs( struct user_fxsr_struct __user *buf, |
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| 114 | struct task_struct *tsk ); |
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| 115 | extern int set_fpxregs( struct task_struct *tsk, |
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| 116 | struct user_fxsr_struct __user *buf ); |
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| 117 | |||
| 118 | /* |
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| 119 | * FPU state for core dumps... |
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| 120 | */ |
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| 121 | extern int dump_fpu( struct pt_regs *regs, |
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| 122 | struct user_i387_struct *fpu ); |
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| 123 | extern int dump_extended_fpu( struct pt_regs *regs, |
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| 124 | struct user_fxsr_struct *fpu ); |
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| 125 | |||
| 126 | #endif /* __ASM_I386_I387_H */ |