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check the FPU owner before restoring the FPU registers

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This commit is contained in:
Stefan Lankes 2016-02-15 01:14:55 +01:00
parent d24c5da5d9
commit 513cc6576e
1 changed files with 10 additions and 7 deletions
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17
hermit/kernel/tasks.c
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@ -127,6 +127,16 @@ void fpu_handler(struct state *s)
uint32_t core_id = CORE_ID;
clts(); // clear the TS flag of cr0
task->flags |= TASK_FPU_USED;
if (!(task->flags & TASK_FPU_INIT)) {
// use the FPU at the first time => Initialize FPU
fpu_init(&task->fpu);
task->flags |= TASK_FPU_INIT;
}
if (readyqueues[core_id].fpu_owner == task->id)
return;
spinlock_irqsave_lock(&readyqueues[core_id].lock);
// did another already use the the FPU? => save FPU state
@ -136,14 +146,7 @@ void fpu_handler(struct state *s)
}
spinlock_irqsave_unlock(&readyqueues[core_id].lock);
if (BUILTIN_EXPECT(!(task->flags & TASK_FPU_INIT), 0)) {
// use the FPU at the first time => Initialize FPU
fpu_init(&task->fpu);
task->flags |= TASK_FPU_INIT;
}
restore_fpu_state(&task->fpu);
task->flags |= TASK_FPU_USED;
}
int set_idle_task(void)