diff options
-rw-r--r-- | defs.h | 1 | ||||
-rw-r--r-- | mp.c | 6 | ||||
-rw-r--r-- | spinlock.c | 3 |
3 files changed, 10 insertions, 0 deletions
@@ -41,6 +41,7 @@ void lapic_init(int); void lapic_timerinit(void); void lapic_timerintr(void); void lapic_enableintr(void); +void lapic_disableintr(void); // spinlock.c extern uint32_t kernel_lock; @@ -183,6 +183,12 @@ lapic_enableintr(void) lapic_write(LAPIC_TPR, 0); } +void +lapic_disableintr(void) +{ + lapic_write(LAPIC_TPR, 0xFF); +} + int cpu(void) { @@ -14,6 +14,8 @@ acquire_spinlock(uint32_t* lock) if (*lock == cpu_id) return; + + lapic_disableintr(); while ( cmpxchg(LOCK_FREE, cpu_id, lock) != cpu_id ) { ; } // cprintf ("acquired: %d\n", cpu_id); } @@ -26,6 +28,7 @@ release_spinlock(uint32_t* lock) if (*lock != cpu_id) panic("release_spinlock: releasing a lock that i don't own\n"); *lock = LOCK_FREE; + lapic_enableintr(); } void |