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arm64: add spinlock implementation

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Provide a simple spinlock implentation for arm64. A value
of 0 is unlocked and a value of 1 is locked.

BUG=chrome-os-partner:31761
BRANCH=None
TEST=Built and ran SMP bringup on ryu.

Change-Id: I3bf2d80b91112d04442455ff0fa3f16900b7327f
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/216923
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
This commit is contained in:
Aaron Durbin 2014-09-06 01:24:38 -05:00 • committed by chrome-internal-fetch
commit 14dab94610
1 changed files with 24 additions and 1 deletions
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25
src/arch/arm64/include/armv8/arch/smp/spinlock.h
View file

@ -1,6 +1,29 @@
#ifndef ARCH_SMP_SPINLOCK_H
#define ARCH_SMP_SPINLOCK_H
#error "spinlocks: implement this for ARM64"
#include <arch/barrier.h>
#include <stdint.h>
typedef struct {
volatile uint32_t lock;
} spinlock_t;
#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
#define DECLARE_SPIN_LOCK(x) static spinlock_t x = SPIN_LOCK_UNLOCKED;
static inline void spin_lock(spinlock_t *spin)
{
while (1) {
if (load_acquire_exclusive(&spin->lock) != 0)
continue;
if (store_release_exclusive(&spin->lock, 1))
break;
}
}
static inline void spin_unlock(spinlock_t *spin)
{
store_release(&spin->lock, 0);
}
#endif