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Merge pull request #2377 from zehortigoza/fpu-fix

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Fix x86 FPU lazy swap
This commit is contained in:
René Kijewski 2015-04-03 03:30:56 +02:00
commit 1d5c3e4176
1 changed files with 4 additions and 0 deletions
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4
cpu/x86/x86_threading.c
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@ -55,6 +55,8 @@ static kernel_pid_t fpu_owner = KERNEL_PID_UNDEF;
//static ucontext_t *cur_ctx, *isr_ctx; //static ucontext_t *cur_ctx, *isr_ctx;
static struct x86_fxsave initial_fpu_state;
int inISR(void) int inISR(void)
{ {
return x86_in_isr; return x86_in_isr;
@ -169,6 +171,7 @@ char *thread_stack_init(thread_task_func_t task_func, void *arg, void *stack_sta
p->uc_stack.ss_size = stacksize; p->uc_stack.ss_size = stacksize;
p->uc_link = &end_context; p->uc_link = &end_context;
p->uc_context.flags |= X86_IF; p->uc_context.flags |= X86_IF;
p->__fxsave = initial_fpu_state;
makecontext(p, (makecontext_fun_t) task_func, 1, arg); makecontext(p, (makecontext_fun_t) task_func, 1, arg);
return (char *) p; return (char *) p;
@ -218,6 +221,7 @@ void x86_init_threading(void)
makecontext(&end_context, x86_thread_exit, 0); makecontext(&end_context, x86_thread_exit, 0);
x86_interrupt_handler_set(X86_INT_NM, fpu_used_interrupt); x86_interrupt_handler_set(X86_INT_NM, fpu_used_interrupt);
asm volatile ("fxsave (%0)" :: "r"(&initial_fpu_state));
DEBUG("Threading initialized\n"); DEBUG("Threading initialized\n");
} }