MdePkg UefiPciSegmentLibPciRootBridgeIo: Remove redundant dependency

[mirror_edk2.git] / MdePkg / Library / SecPeiDxeTimerLibCpu / IpfTimerLib.c

diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c b/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c
index fec938db23f9e63c8384d223120202727e0df2f6..714b99eec41431a6fca7fedfd29098df2d9d9346 100644 (file)
--- a/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c
+++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c
@@ -1,11 +1,11 @@
 /** @file\r
   Timer Library functions built upon ITC on IPF.\r
 \r
-  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
-  All rights reserved. This program and the accompanying materials\r
+  Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r
+  This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
-  http://opensource.org/licenses/bsd-license.php\r
+  http://opensource.org/licenses/bsd-license.php.\r
 \r
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
@@ -24,7 +24,7 @@
   An internal function to perform a delay measured as number of ticks. It's\r
   invoked by MicroSecondDelay() and NanoSecondDelay().\r
 \r
-  @param  Delay Number of ticks to delay.\r
+  @param  Delay The number of ticks to delay.\r
 \r
 **/\r
 VOID\r
@@ -97,8 +97,9 @@ NanoSecondDelay (
 }\r
 \r
 /**\r
-  Retrieves the current value of a 64-bit free running performance counter. The\r
-  counter can either count up by 1 or count down by 1. If the physical\r
+  Retrieves the current value of a 64-bit free running performance counter.\r
+\r
+  The counter can either count up by 1 or count down by 1. If the physical\r
   performance counter counts by a larger increment, then the counter values\r
   must be translated. The properties of the counter can be retrieved from\r
   GetPerformanceCounterProperties().\r
@@ -169,3 +170,47 @@ GetPerformanceCounterProperties (
 \r
   return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;\r
 }\r
+\r
+/**\r
+  Converts elapsed ticks of performance counter to time in nanoseconds.\r
+\r
+  This function converts the elapsed ticks of running performance counter to\r
+  time value in unit of nanoseconds.\r
+\r
+  @param  Ticks     The number of elapsed ticks of running performance counter.\r
+\r
+  @return The elapsed time in nanoseconds.\r
+\r
+**/\r
+UINT64\r
+EFIAPI\r
+GetTimeInNanoSecond (\r
+  IN      UINT64                     Ticks\r
+  )\r
+{\r
+  UINT64  Frequency;\r
+  UINT64  NanoSeconds;\r
+  UINT64  Remainder;\r
+  INTN    Shift;\r
+\r
+  Frequency = GetPerformanceCounterProperties (NULL, NULL);\r
+\r
+  //\r
+  //          Ticks\r
+  // Time = --------- x 1,000,000,000\r
+  //        Frequency\r
+  //\r
+  NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);\r
+\r
+  //\r
+  // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.\r
+  // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,\r
+  // i.e. highest bit set in Remainder should <= 33.\r
+  //\r
+  Shift = MAX (0, HighBitSet64 (Remainder) - 33);\r
+  Remainder = RShiftU64 (Remainder, (UINTN) Shift);\r
+  Frequency = RShiftU64 (Frequency, (UINTN) Shift);\r
+  NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);\r
+\r
+  return NanoSeconds;\r
+}\r