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Unlock context switch lock without potentially screwing up switch_to function

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This commit is contained in:
Jeremy Soller 2016-09-18 21:05:59 -06:00
parent 36fde7c7c5
commit 1331f4103f
1 changed files with 8 additions and 2 deletions
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10
arch/x86_64/src/context.rs
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@ -52,6 +52,7 @@ impl Context {
} }
/// Switch to the next context by restoring its stack and registers /// Switch to the next context by restoring its stack and registers
#[cold]
#[inline(never)] #[inline(never)]
#[naked] #[naked]
pub unsafe fn switch_to(&mut self, next: &mut Context) { pub unsafe fn switch_to(&mut self, next: &mut Context) {
@ -94,7 +95,12 @@ impl Context {
asm!("mov $0, rbp" : "=r"(self.rbp) : : "memory" : "intel", "volatile"); asm!("mov $0, rbp" : "=r"(self.rbp) : : "memory" : "intel", "volatile");
asm!("mov rbp, $0" : : "r"(next.rbp) : "memory" : "intel", "volatile"); asm!("mov rbp, $0" : : "r"(next.rbp) : "memory" : "intel", "volatile");
// Unset global lock, set inside of kernel asm!("call context_switch_unlock" : : : "memory" : "intel", "volatile");
CONTEXT_SWITCH_LOCK.store(false, Ordering::SeqCst);
} }
} }
/// Unset global lock, set inside of kernel
#[no_mangle]
extern fn context_switch_unlock(){
CONTEXT_SWITCH_LOCK.store(false, Ordering::SeqCst);
}