Changeset 53476 in vbox

Timestamp:

Dec 8, 2014 11:18:56 AM (10 years ago)

Author:

vboxsync

Message:

HostDrivers/support: Use 128-bit unsigned int math as mentioned in r97204.

Location:

trunk/src/VBox/HostDrivers/Support

Files:

• SUPDrv.c (modified) (2 diffs)
• linux/files_vboxdrv (modified) (1 diff)

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

@@ -46 +46 @@
 #include <iprt/spinlock.h>
 #include <iprt/thread.h>
+#include <iprt/uint128.h>
 #include <iprt/uuid.h>
 #include <iprt/net.h>
@@ -6171 +6172 @@
     else
     {
-        /* Try not to lose precision, the larger the interval the more likely we overflow. */
-#if 0  /** @todo r=bird: What about falling back on iprt/uint128.h here instead of
-         * trading accuracy for values that works with ASMMultU64ByU32DivByU32? Speed
-         * is hardly an issue at this point. */
+#if 1
         RTUINT128U CpuHz, Tmp, Divisor;
-        RTUInt128MulU64ByU64(&Tmp, u64DeltaTsc, RT_NS_1SEC);
+        CpuHz.s.Lo = CpuHz.s.Hi = 0;
+        RTUInt128MulU64ByU64(&Tmp, u64DeltaTsc, RT_NS_1SEC_64);
         RTUInt128Div(&CpuHz, &Tmp, RTUInt128AssignU64(&Divisor, u64DeltaNanoTS));
         pGip->u64CpuHz = CpuHz.s.Lo;
 #else
+        /* Try not to lose precision, the larger the interval the more likely we overflow. */
         if (   u64DeltaTsc < UINT64_MAX / RT_NS_100MS
             && u64DeltaNanoTS / 10 < UINT32_MAX)

trunk/src/VBox/HostDrivers/Support/linux/files_vboxdrv

@@ -64 +64 @@
     ${PATH_ROOT}/include/iprt/timer.h=>include/iprt/timer.h \
     ${PATH_ROOT}/include/iprt/types.h=>include/iprt/types.h \
+    ${PATH_ROOT}/include/iprt/uint128.h=>include/iprt/uint128.h \
     ${PATH_ROOT}/include/iprt/uni.h=>include/iprt/uni.h \
     ${PATH_ROOT}/include/iprt/uuid.h=>include/iprt/uuid.h \