Changeset 8789 in vbox for trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp

Timestamp:

May 13, 2008 3:43:59 PM (17 years ago)

Author:

vboxsync

Message:

Windows host: also check for tsc consistency across cores/cpus. The TSC invariant cpuid bit doesn't always imply consistent behaviour on the new barcelona cpus.

File:

• trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp (modified) (3 diffs)

trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp

@@ -120 +120 @@
         if (NT_SUCCESS(rc))
         {
+            uint64_t  u64DiffCores;
+
             /*
              * Initialize the device extension.
@@ -125 +127 @@
             PSUPDRVDEVEXT pDevExt = (PSUPDRVDEVEXT)pDevObj->DeviceExtension;
             memset(pDevExt, 0, sizeof(*pDevExt));
+
+            /* Make sure the tsc is consistent across cpus/cores. */
+            pDevExt->fForceAsyncTsc = supdrvDetermineAsyncTsc(&u64DiffCores);
+            dprintf(("supdrvDetermineAsyncTsc: fAsync=%d u64DiffCores=%u.\n", pDevExt->fForceAsyncTsc, (uint32_t)u64DiffCores));
+
             int vrc = supdrvInitDevExt(pDevExt);
             if (!vrc)
@@ -767 +774 @@
  * Force async tsc mode (stub).
  */
-bool VBOXCALL  supdrvOSGetForcedAsyncTscMode(void)
-{
-    return false;
+bool VBOXCALL  supdrvOSGetForcedAsyncTscMode(PSUPDRVDEVEXT pDevExt)
+{
+    return pDevExt->fForceAsyncTsc != 0;
 }