Changeset 8911 in vbox for trunk/src/VBox/VMM

Timestamp:

May 19, 2008 10:08:21 AM (17 years ago)

Author:

vboxsync

Message:

No fixed tsc if the GIP timer is in async mode. (TM; AMD cpus with invariant cpuid bit set)

File:

• trunk/src/VBox/VMM/TM.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/TM.cpp

@@ -540 +540 @@
  * @returns true if it has, false if it hasn't.
  *
- * @remark  This test doesn't bother with very old CPUs that doesn't do power
+ * @remark  This test doesn't bother with very old CPUs that don't do power
  *          management or any other stuff that might influence the TSC rate.
  *          This isn't currently relevant.
@@ -565 +565 @@
             if (uEAX >= 0x80000007)
             {
+                PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
+
                 ASMCpuId(0x80000007, &uEAX, &uEBX, &uECX, &uEDX);
-                if (uEDX & RT_BIT(8) /* TscInvariant */)
+                if (   (uEDX & RT_BIT(8)) /* TscInvariant */
+                    && pGip->u32Mode == SUPGIPMODE_SYNC_TSC /* no fixed tsc if the gip timer is in async mode */)
                     return true;
             }