xnu-4570.71.2.tar.gz

[apple/xnu.git] / osfmk / arm / commpage / commpage.c

diff --git a/osfmk/arm/commpage/commpage.c b/osfmk/arm/commpage/commpage.c
index 430a149b71583411acb2497b47987a4527e04852..27cfadba928380bed85679e89538c620c731d0aa 100644 (file)
--- a/osfmk/arm/commpage/commpage.c
+++ b/osfmk/arm/commpage/commpage.c
@@ -50,6 +50,8 @@
 #include <arm/rtclock.h>
 #include <libkern/OSAtomic.h>
 #include <stdatomic.h>
+#include <kern/remote_time.h>
+#include <machine/machine_remote_time.h>
 
 #include <sys/kdebug.h>
 
@@ -422,3 +424,27 @@ commpage_update_boottime(uint64_t value)
 #endif /* __arm64__ */
        }
 }
+
+/*
+ * set the commpage's remote time params for
+ * userspace call to mach_bridge_remote_time()
+ */
+ void
+ commpage_set_remotetime_params(double rate, uint64_t base_local_ts, uint64_t base_remote_ts)
+ {
+        if (commPagePtr) {
+#ifdef __arm64__
+               struct bt_params *paramsp = (struct bt_params *)(_COMM_PAGE_REMOTETIME_PARAMS + _COMM_PAGE_RW_OFFSET);
+               paramsp->base_local_ts = 0;
+               __asm__ volatile("dmb ish" ::: "memory");
+               paramsp->rate = rate;
+               paramsp->base_remote_ts = base_remote_ts;
+               __asm__ volatile("dmb ish" ::: "memory");
+               paramsp->base_local_ts = base_local_ts;  //This will act as a generation count
+#else
+               (void)rate;
+               (void)base_local_ts;
+               (void)base_remote_ts;
+#endif /* __arm64__ */
+       }
+}