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Encapsulated FPU restore instructions.

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There is a new procedure restore_fpu_state() in
arch/x86/include/asm/tasks_types.
Will need this code in lguest, too.
This commit is contained in:
Jacek Galowicz 2011-05-30 11:22:54 +02:00
parent 3ff984a21c
commit 7fdb044e9a
2 changed files with 8 additions and 5 deletions
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7
arch/x86/include/asm/tasks_types.h
View file

@ -68,6 +68,13 @@ static inline void save_fpu_state(union fpu_state* state) {
asm volatile ("fsave %0; fwait" : "=m"((*state).fsave));
}
static inline void restore_fpu_state(union fpu_state* state) {
if (has_fxsr())
asm volatile ("fxrstor %0" :: "m"(state->fxsave));
else
asm volatile ("frstor %0" :: "m"(state->fsave));
}
#ifdef __cplusplus
}
#endif

6
arch/x86/kernel/isrs.c
View file

@ -196,11 +196,7 @@ static void fpu_handler(struct state *s)
task->flags |= TASK_FPU_INIT;
}
// restore the FPU context
if (has_fxsr())
asm volatile ("fxrstor %0" :: "m"(task->fpu.fxsave));
else
asm volatile ("frstor %0" :: "m"(task->fpu.fsave));
restore_fpu_state(&task->fpu);
task->flags |= TASK_FPU_USED;
}