Changeset 57090 in vbox for trunk/src/VBox/HostDrivers

Timestamp:

Jul 27, 2015 9:44:51 AM (10 years ago)

Author:

vboxsync

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

101813

Message:

SUP: Moved SUPIsTscFreqCompatible(Ex) to SUPLibAll.cpp and made it not inlined.

Location:

trunk/src/VBox/HostDrivers/Support

Files:

• SUPDrv.cpp (modified) (1 diff)
• SUPLibAll.cpp (modified) (1 diff)

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

@@ -161 +161 @@
     { "SUPGetTscDeltaSlow",                     (void *)SUPGetTscDeltaSlow },
     { "SUPGetCpuHzFromGipForAsyncMode",         (void *)SUPGetCpuHzFromGipForAsyncMode },
+    { "SUPIsTscFreqCompatible",                 (void *)SUPIsTscFreqCompatible },
+    { "SUPIsTscFreqCompatibleEx",               (void *)SUPIsTscFreqCompatibleEx },
     { "SUPR0ComponentDeregisterFactory",        (void *)SUPR0ComponentDeregisterFactory },
     { "SUPR0ComponentQueryFactory",             (void *)SUPR0ComponentQueryFactory },

trunk/src/VBox/HostDrivers/Support/SUPLibAll.cpp

@@ -270 +270 @@
 
 
+
+/**
+ * Worker for SUPIsTscFreqCompatible().
+ *
+ * @returns true if it's compatible, false otherwise.
+ * @param   uBaseCpuHz      The reference CPU frequency of the system.
+ * @param   uCpuHz          The CPU frequency to compare with the base.
+ * @param   fRelax          Whether to use a more relaxed threshold (like
+ *                          for when running in a virtualized environment).
+ *
+ * @remarks Don't use directly, use SUPIsTscFreqCompatible() instead. This is
+ *          to be used by tstGIP-2 or the like.
+ */
+SUPDECL(bool) SUPIsTscFreqCompatibleEx(uint64_t uBaseCpuHz, uint64_t uCpuHz, bool fRelax)
+{
+    if (uBaseCpuHz != uCpuHz)
+    {
+        /* Arbitrary tolerance threshold, tweak later if required, perhaps
+           more tolerance on lower frequencies and less tolerance on higher. */
+        uint16_t uThr = !fRelax ? 666 /* 0.15% */ : 125 /* 0.8% */;
+        uint64_t uLo  = uBaseCpuHz / uThr;
+        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.
+ *
+ * @returns true if it's compatible, false otherwise.
+ * @param   uCpuHz          The TSC frequency to check.
+ * @param   puGipCpuHz      Where to store the GIP TSC frequency used
+ *                          during the compatibility test - optional.
+ * @param   fRelax          Whether to use a more relaxed threshold (like
+ *                          for when running in a virtualized environment).
+ */
+SUPDECL(bool) SUPIsTscFreqCompatible(uint64_t uCpuHz, uint64_t *puGipCpuHz, bool fRelax)
+{
+    PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
+    if (   pGip
+        && pGip->u32Mode != SUPGIPMODE_ASYNC_TSC)
+    {
+        uint64_t uGipCpuHz = pGip->u64CpuHz;
+        if (puGipCpuHz)
+            *puGipCpuHz = uGipCpuHz;
+        return SUPIsTscFreqCompatibleEx(uGipCpuHz, uCpuHz, fRelax);
+    }
+    return false;
+}
+
 #endif /* RT_ARCH_AMD64 || RT_ARCH_X86 */