Changeset 54352 in vbox for trunk/include

Timestamp:

Feb 22, 2015 1:32:45 AM (10 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

98440

Message:

SUPDrv,TM: Overhauled the CPU/TSC frequency a little, making it possible to run it early and skpping the 200 ms variant for the invariant tsc by executing the refinement timer several times.

File:

• trunk/include/VBox/sup.h (modified) (6 diffs)

trunk/include/VBox/sup.h

@@ -496 +496 @@
  * Gets the TSC frequency of the calling CPU.
  *
- * @returns TSC frequency, UINT64_MAX on failure.
+ * @returns TSC frequency, UINT64_MAX on failure (asserted).
  * @param   pGip        The GIP pointer.
  */
@@ -502 +502 @@
 {
     if (RT_LIKELY(   pGip
-                  && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC
-                  && pGip->u64CpuHz))
+                  && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC))
     {
         switch (pGip->u32Mode)
@@ -523 +522 @@
  * Gets the TSC frequency of the specified CPU.
  *
- * @returns TSC frequency, UINT64_MAX on failure.
+ * @returns TSC frequency, UINT64_MAX on failure (asserted).
  * @param   pGip        The GIP pointer.
  * @param   iCpuSet     The CPU set index of the CPU in question.
@@ -530 +529 @@
 {
     if (RT_LIKELY(   pGip
-                  && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC
-                  && pGip->u64CpuHz))
+                  && pGip->u32Magic == SUPGLOBALINFOPAGE_MAGIC))
     {
         switch (pGip->u32Mode)
@@ -554 +552 @@
 
 
+#if 0 /* Not used anywhere.  Unsure where this would be useful. */
 /**
  * Checks if the provided TSC frequency is close enough to the computed TSC
@@ -580 +579 @@
     return false;
 }
+#endif
 
 #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)