X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0a7de7458d150b5d4dffc935ba399be265ef0a1a..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/libsyscall/wrappers/mach_continuous_time.c

diff --git a/libsyscall/wrappers/mach_continuous_time.c b/libsyscall/wrappers/mach_continuous_time.c
index 353ef0d87..e07aba3bf 100644
--- a/libsyscall/wrappers/mach_continuous_time.c
+++ b/libsyscall/wrappers/mach_continuous_time.c
@@ -59,11 +59,12 @@ kern_return_t
 _mach_continuous_hwclock(uint64_t *cont_time __unused)
 {
 #if defined(__arm64__)
+#define ISB_SY          0xf
 	uint8_t cont_hwclock = *((uint8_t*)_COMM_PAGE_CONT_HWCLOCK);
-	uint64_t timebase;
 	if (cont_hwclock) {
-		__asm__ volatile ("isb\n" "mrs %0, CNTPCT_EL0" : "=r"(timebase));
-		*cont_time = timebase;
+		volatile uint64_t *base_ptr = (volatile uint64_t*)_COMM_PAGE_CONT_HW_TIMEBASE;
+		__builtin_arm_isb(ISB_SY);
+		*cont_time = __builtin_arm_rsr64("CNTVCT_EL0") + *base_ptr;
 		return KERN_SUCCESS;
 	}
 #endif