diff options
| -rw-r--r-- | sys/arch/amd64/amd64/lapic.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/lapic.c b/sys/arch/amd64/amd64/lapic.c index 3a87b74..7b3bd98 100644 --- a/sys/arch/amd64/amd64/lapic.c +++ b/sys/arch/amd64/amd64/lapic.c @@ -32,6 +32,7 @@ #include <sys/panic.h> #include <sys/mmio.h> #include <sys/syslog.h> +#include <sys/spinlock.h> #include <dev/timer.h> #include <machine/intr.h> #include <machine/isa/i8254.h> @@ -262,6 +263,9 @@ lapic_timer_init(void) uint16_t ticks_start, ticks_end; size_t ticks_total, freq; const uint16_t MAX_SAMPLES = 0xFFFF; + static struct spinlock lock = {0}; + + spinlock_acquire(&lock); lapic_timer_stop(); i8254_set_reload(MAX_SAMPLES); @@ -275,6 +279,8 @@ lapic_timer_init(void) freq = (MAX_SAMPLES / ticks_total) * I8254_DIVIDEND; lapic_timer_stop(); + + spinlock_release(&lock); return freq; } |