| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * include/asm-i386/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 | */ |
| 10 | |
| 11 | #ifndef __ASM_I386_I387_H |
| 12 | #define __ASM_I386_I387_H |
| 13 | |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <asm/processor.h> |
| 17 | #include <asm/sigcontext.h> |
| 18 | #include <asm/user.h> |
| 19 | |
| 20 | extern void mxcsr_feature_mask_init(void); |
| 21 | extern void init_fpu(struct task_struct *); |
| 22 | /* |
| 23 | * FPU lazy state save handling... |
| 24 | */ |
| 25 | extern void restore_fpu( struct task_struct *tsk ); |
| 26 | |
| 27 | extern void kernel_fpu_begin(void); |
| 28 | #define kernel_fpu_end() do { stts(); preempt_enable(); } while(0) |
| 29 | |
| 30 | /* |
| 31 | * These must be called with preempt disabled |
| 32 | */ |
| 33 | static inline void __save_init_fpu( struct task_struct *tsk ) |
| 34 | { |
| 35 | if ( cpu_has_fxsr ) { |
| 36 | asm volatile( "fxsave %0 ; fnclex" |
| 37 | : "=m" (tsk->thread.i387.fxsave) ); |
| 38 | } else { |
| 39 | asm volatile( "fnsave %0 ; fwait" |
| 40 | : "=m" (tsk->thread.i387.fsave) ); |
| 41 | } |
| 42 | tsk->thread_info->status &= ~TS_USEDFPU; |
| 43 | } |
| 44 | |
| 45 | #define __unlazy_fpu( tsk ) do { \ |
| 46 | if ((tsk)->thread_info->status & TS_USEDFPU) \ |
| 47 | save_init_fpu( tsk ); \ |
| 48 | } while (0) |
| 49 | |
| 50 | #define __clear_fpu( tsk ) \ |
| 51 | do { \ |
| 52 | if ((tsk)->thread_info->status & TS_USEDFPU) { \ |
| 53 | asm volatile("fnclex ; fwait"); \ |
| 54 | (tsk)->thread_info->status &= ~TS_USEDFPU; \ |
| 55 | stts(); \ |
| 56 | } \ |
| 57 | } while (0) |
| 58 | |
| 59 | |
| 60 | /* |
| 61 | * These disable preemption on their own and are safe |
| 62 | */ |
| 63 | static inline void save_init_fpu( struct task_struct *tsk ) |
| 64 | { |
| 65 | preempt_disable(); |
| 66 | __save_init_fpu(tsk); |
| 67 | stts(); |
| 68 | preempt_enable(); |
| 69 | } |
| 70 | |
| 71 | #define unlazy_fpu( tsk ) do { \ |
| 72 | preempt_disable(); \ |
| 73 | __unlazy_fpu(tsk); \ |
| 74 | preempt_enable(); \ |
| 75 | } while (0) |
| 76 | |
| 77 | #define clear_fpu( tsk ) do { \ |
| 78 | preempt_disable(); \ |
| 79 | __clear_fpu( tsk ); \ |
| 80 | preempt_enable(); \ |
| 81 | } while (0) |
| 82 | \ |
| 83 | /* |
| 84 | * FPU state interaction... |
| 85 | */ |
| 86 | extern unsigned short get_fpu_cwd( struct task_struct *tsk ); |
| 87 | extern unsigned short get_fpu_swd( struct task_struct *tsk ); |
| 88 | extern unsigned short get_fpu_mxcsr( struct task_struct *tsk ); |
| 89 | |
| 90 | /* |
| 91 | * Signal frame handlers... |
| 92 | */ |
| 93 | extern int save_i387( struct _fpstate __user *buf ); |
| 94 | extern int restore_i387( struct _fpstate __user *buf ); |
| 95 | |
| 96 | /* |
| 97 | * ptrace request handers... |
| 98 | */ |
| 99 | extern int get_fpregs( struct user_i387_struct __user *buf, |
| 100 | struct task_struct *tsk ); |
| 101 | extern int set_fpregs( struct task_struct *tsk, |
| 102 | struct user_i387_struct __user *buf ); |
| 103 | |
| 104 | extern int get_fpxregs( struct user_fxsr_struct __user *buf, |
| 105 | struct task_struct *tsk ); |
| 106 | extern int set_fpxregs( struct task_struct *tsk, |
| 107 | struct user_fxsr_struct __user *buf ); |
| 108 | |
| 109 | /* |
| 110 | * FPU state for core dumps... |
| 111 | */ |
| 112 | extern int dump_fpu( struct pt_regs *regs, |
| 113 | struct user_i387_struct *fpu ); |
| 114 | |
| 115 | #endif /* __ASM_I386_I387_H */ |