diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-09-06 01:24:38 -0500 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-27 08:04:47 +0100 |
| commit | dbab8cbc31ffbcf4193defae4e8fd7d26e8ae519 (patch) | |
| tree | 77824993fc42fa04c8cf4173f235121e02cfb8d8 /src | |
| parent | ef4419e2cd29bcae4bf42b8230be0baec9e367a9 (diff) | |
arm64: add spinlock implementation
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: Ie88a715a6b51cd38a5fdd830583dae528cc49d67
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 14dab94610c96d6b1530c64d661833f8e613101c
Original-Change-Id: I3bf2d80b91112d04442455ff0fa3f16900b7327f
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/216923
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9040
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/arm64/include/armv8/arch/smp/spinlock.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/arch/arm64/include/armv8/arch/smp/spinlock.h b/src/arch/arm64/include/armv8/arch/smp/spinlock.h index 8a89d1f011..10278e72ae 100644 --- a/src/arch/arm64/include/armv8/arch/smp/spinlock.h +++ b/src/arch/arm64/include/armv8/arch/smp/spinlock.h @@ -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 |