diff options
Diffstat (limited to 'src/cpu/x86/smm/smihandler.c')
| -rw-r--r-- | src/cpu/x86/smm/smihandler.c | 8 |
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; } |