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-rw-r--r--src/cpu/x86/smm/smihandler.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/cpu/x86/smm/smihandler.c b/src/cpu/x86/smm/smihandler.c
index d44a3eae1b..a6ab87fd65 100644
--- a/src/cpu/x86/smm/smihandler.c
+++ b/src/cpu/x86/smm/smihandler.c
@@ -28,7 +28,7 @@
typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore;
/* SMI multiprocessing semaphore */
-static volatile smi_semaphore smi_handler_status = SMI_UNLOCKED;
+static volatile smi_semaphore smi_handler_status __attribute__ ((aligned (4))) = SMI_UNLOCKED;
static int smi_obtain_lock(void)
{
@@ -121,7 +121,11 @@ void smi_handler(u32 smm_revision)
/* For security reasons we don't release the other CPUs
* until the CPU with the lock is actually done
*/
- while (smi_handler_status == SMI_LOCKED) /* wait */ ;
+ while (smi_handler_status == SMI_LOCKED) {
+ asm volatile (
+ ".byte 0xf3, 0x90\n" /* hint a CPU we are in spinlock (PAUSE instruction, REP NOP) */
+ );
+ }
return;
}