Changeset 56952 in vbox

Timestamp:

Jul 16, 2015 12:57:28 PM (10 years ago)

Author:

vboxsync

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

101661

Message:

sup.h: enabled compiling of SUPIsTscFreqCompatible().

File:

• trunk/include/VBox/sup.h (modified) (2 diffs)

trunk/include/VBox/sup.h

@@ -552 +552 @@
 
 
-#if 0 /* Not used anywhere.  Unsure where this would be useful. */
+/**
+ * Worker for SUPIsTscFreqCompatible().
+ *
+ * @param uBaseCpuHz        The reference CPU frequency of the system.
+ * @param uCpuHz            The CPU frequency to compare with the base.
+ *
+ * @returns true if it's compatible, false otherwise.
+ * @remarks Don't use directly, use SUPIsTscFreqCompatible() instead. This is
+ *          to be used by tstGIP-2 (or the like).
+ */
+DECLINLINE(bool) SUPIsTscFreqCompatibleEx(uint64_t uBaseCpuHz, uint64_t uCpuHz)
+{
+    if (uBaseCpuHz != uCpuHz)
+    {
+        /* Arbitrary tolerance threshold, tweak later if required, perhaps
+           more tolerance on lower frequencies and less tolerance on higher. */
+        uint64_t uLo = (uBaseCpuHz << 11) / 2049;
+        uint64_t uHi = uBaseCpuHz + (uBaseCpuHz - uLo);
+        if (   uCpuHz < uLo
+            || uCpuHz > uHi)
+            return false;
+    }
+    return true;
+}
+
+
 /**
  * Checks if the provided TSC frequency is close enough to the computed TSC
  * frequency of the host.
+ *
+ * @param   u64CpuHz        The TSC frequency to check.
  *
  * @returns true if it's compatible, false otherwise.
@@ -564 +591 @@
     if (   pGip
         && pGip->u32Mode == SUPGIPMODE_INVARIANT_TSC)
-    {
-        if (pGip->u64CpuHz != u64CpuHz)
-        {
-            /* Arbitrary tolerance threshold, tweak later if required, perhaps
-               more tolerance on lower frequencies and less tolerance on higher. */
-            uint64_t uLo = (pGip->u64CpuHz << 10) / 1025;
-            uint64_t uHi = pGip->u64CpuHz + (pGip->u64CpuHz - uLo);
-            if (   u64CpuHz < uLo
-                || u64CpuHz > uHi)
-                return false;
-        }
-        return true;
-    }
+        return SUPIsTscFreqCompatibleEx(pGip->u64CpuHz, u64CpuHz);
     return false;
 }
-#endif
+
 
 #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)