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-rw-r--r--include/asm-i386/i387.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/asm-i386/i387.h b/include/asm-i386/i387.h
index f6feb98a9397..e678609bb57e 100644
--- a/include/asm-i386/i387.h
+++ b/include/asm-i386/i387.h
@@ -19,10 +19,21 @@
19 19
20extern void mxcsr_feature_mask_init(void); 20extern void mxcsr_feature_mask_init(void);
21extern void init_fpu(struct task_struct *); 21extern void init_fpu(struct task_struct *);
22
22/* 23/*
23 * FPU lazy state save handling... 24 * FPU lazy state save handling...
24 */ 25 */
25extern void restore_fpu( struct task_struct *tsk ); 26
27/*
28 * The "nop" is needed to make the instructions the same
29 * length.
30 */
31#define restore_fpu(tsk) \
32 alternative_input( \
33 "nop ; frstor %1", \
34 "fxrstor %1", \
35 X86_FEATURE_FXSR, \
36 "m" ((tsk)->thread.i387.fsave))
26 37
27extern void kernel_fpu_begin(void); 38extern void kernel_fpu_begin(void);
28#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0) 39#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0)