diff options
| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-22 06:57:39 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-22 06:57:39 +0000 |
| commit | e386b444c88b01c5a14ca846b6ba10dcf5536e05 (patch) | |
| tree | 25d2f4f7e149cec0bba4b5b508b21b10c161e240 /MdePkg/Library/SecPeiDxeTimerLibCpu | |
| parent | b6460fcfd993cde549d9563885a20606caa70686 (diff) | |
| download | edk2-e386b444c88b01c5a14ca846b6ba10dcf5536e05.tar.gz edk2-e386b444c88b01c5a14ca846b6ba10dcf5536e05.tar.bz2 edk2-e386b444c88b01c5a14ca846b6ba10dcf5536e05.zip | |
Import some Pei and Dxe related instances for MdePkg.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2712 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/SecPeiDxeTimerLibCpu')
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/CommonHeader.h | 35 | ||||
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c | 173 | ||||
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.inf | 116 | ||||
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.msa | 64 | ||||
| -rw-r--r-- | MdePkg/Library/SecPeiDxeTimerLibCpu/x86TimerLib.c | 251 |
5 files changed, 639 insertions, 0 deletions
diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/CommonHeader.h b/MdePkg/Library/SecPeiDxeTimerLibCpu/CommonHeader.h new file mode 100644 index 0000000000..7d1af9c790 --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/CommonHeader.h @@ -0,0 +1,35 @@ +/**@file
+ Common header file shared by all source files.
+
+ This file includes package header files, library classes and protocol, PPI & GUID definitions.
+
+ Copyright (c) 2007 - 2007, Intel Corporation.
+ All rights reserved. This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#ifndef __COMMON_HEADER_H_
+#define __COMMON_HEADER_H_
+
+
+//
+// The package level header files this module uses
+//
+#include <Base.h>
+//
+// The protocols, PPI and GUID defintions for this module
+//
+//
+// The Library classes this module consumes
+//
+#include <Library/TimerLib.h>
+#include <Library/BaseLib.h>
+#include <Library/IoLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+
+#endif
diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c b/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c new file mode 100644 index 0000000000..2acdab3d2a --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/IpfTimerLib.c @@ -0,0 +1,173 @@ +/** @file
+ Timer Library functions built upon ITC on IPF.
+
+ Copyright (c) 2006 - 2007, Intel Corporation<BR>
+ All rights reserved. This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+ Module Name: IpfTimerLib.c
+
+**/
+
+
+
+
+//
+// Include common header file for this module.
+//
+#include "CommonHeader.h"
+
+/**
+ Performs a delay measured as number of ticks.
+
+ An internal function to perform a delay measured as number of ticks. It's
+ invoked by MicroSecondDelay() and NanoSecondDelay().
+
+ @param Delay Number of ticks to delay.
+
+**/
+STATIC
+VOID
+InternalIpfDelay (
+ IN INT64 Delay
+ )
+{
+ INT64 Ticks;
+
+ //
+ // The target timer count is calculated here
+ //
+ Ticks = (INT64)AsmReadItc () + Delay;
+
+ //
+ // Wait until time out
+ // Delay > 2^63 could not be handled by this function
+ // Timer wrap-arounds are handled correctly by this function
+ //
+ while (Ticks - (INT64)AsmReadItc() >= 0);
+}
+
+/**
+ Stalls the CPU for at least the given number of microseconds.
+
+ Stalls the CPU for the number of microseconds specified by MicroSeconds.
+
+ @param MicroSeconds The minimum number of microseconds to delay.
+
+ @return MicroSeconds
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+ IN UINTN MicroSeconds
+ )
+{
+ InternalIpfDelay (
+ GetPerformanceCounterProperties (NULL, NULL) *
+ MicroSeconds /
+ 1000000
+ );
+ return MicroSeconds;
+}
+
+/**
+ Stalls the CPU for at least the given number of nanoseconds.
+
+ Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
+
+ @param NanoSeconds The minimum number of nanoseconds to delay.
+
+ @return NanoSeconds
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+ IN UINTN NanoSeconds
+ )
+{
+ InternalIpfDelay (
+ GetPerformanceCounterProperties (NULL, NULL) *
+ NanoSeconds /
+ 1000000000
+ );
+ return NanoSeconds;
+}
+
+/**
+ Retrieves the current value of a 64-bit free running performance counter.
+
+ Retrieves the current value of a 64-bit free running performance counter. The
+ counter can either count up by 1 or count down by 1. If the physical
+ performance counter counts by a larger increment, then the counter values
+ must be translated. The properties of the counter can be retrieved from
+ GetPerformanceCounterProperties().
+
+ @return The current value of the free running performance counter.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounter (
+ VOID
+ )
+{
+ return AsmReadItc ();
+}
+
+/**
+ Retrieves the 64-bit frequency in Hz and the range of performance counter
+ values.
+
+ If StartValue is not NULL, then the value that the performance counter starts
+ with immediately after is it rolls over is returned in StartValue. If
+ EndValue is not NULL, then the value that the performance counter end with
+ immediately before it rolls over is returned in EndValue. The 64-bit
+ frequency of the performance counter in Hz is always returned. If StartValue
+ is less than EndValue, then the performance counter counts up. If StartValue
+ is greater than EndValue, then the performance counter counts down. For
+ example, a 64-bit free running counter that counts up would have a StartValue
+ of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
+ that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
+
+ @param StartValue The value the performance counter starts with when it
+ rolls over.
+ @param EndValue The value that the performance counter ends with before
+ it rolls over.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+ OUT UINT64 *StartValue, OPTIONAL
+ OUT UINT64 *EndValue OPTIONAL
+ )
+{
+ PAL_CALL_RETURN PalRet;
+ UINT64 BaseFrequence;
+
+ PalRet = PalCallStatic (NULL, 13, 0, 0, 0);
+ ASSERT (PalRet.Status == 0);
+ BaseFrequence = PalRet.r9;
+
+ PalRet = PalCallStatic (NULL, 14, 0, 0, 0);
+ ASSERT (PalRet.Status == 0);
+
+ if (StartValue != NULL) {
+ *StartValue = 0;
+ }
+
+ if (EndValue != NULL) {
+ *EndValue = (UINT64)(-1);
+ }
+
+ return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;
+}
diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.inf b/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.inf new file mode 100644 index 0000000000..f3d13bd088 --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.inf @@ -0,0 +1,116 @@ +#/** @file
+# Timer Library implementation for Boot Timer moudles that require timer services.
+#
+# Timer Library that uses CPU resources to provide calibrated
+# delays on IA-32 and x64, and uses ITC on IPF. Note: Because CpuLocalApci
+# and ITC could be programmed by OS, it cannot be used by SMM drivers
+# and runtime drivers, ACPI timer is recommended for SMM drivers and RUNTIME
+# drivers.
+# Copyright (c) 2007 - 2007, Intel Corporation.
+#
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+#**/
+
+################################################################################
+#
+# Defines Section - statements that will be processed to create a Makefile.
+#
+################################################################################
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = SecPeiDxeTimerLibCpu
+ FILE_GUID = b5a05743-9b71-489b-a0ed-a0eb3950d23b
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = TimerLib|BASE DXE_CORE DXE_DRIVER DXE_SAL_DRIVER PEIM PEI_CORE SEC UEFI_APPLICATION UEFI_DRIVER
+ EDK_RELEASE_VERSION = 0x00020000
+ EFI_SPECIFICATION_VERSION = 0x00020000
+
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF
+#
+
+################################################################################
+#
+# Sources Section - list of files that are required for the build to succeed.
+#
+################################################################################
+
+[Sources.common]
+ CommonHeader.h
+
+[Sources.Ia32]
+ x86TimerLib.c
+
+[Sources.X64]
+ x86TimerLib.c
+
+[Sources.IPF]
+ IpfTimerLib.c
+
+
+################################################################################
+#
+# Includes Section - list of Include locations that are required for
+# this module.
+#
+################################################################################
+
+[Includes]
+ $(WORKSPACE)/MdePkg\Include/Library
+
+################################################################################
+#
+# Package Dependency Section - list of Package files that are required for
+# this module.
+#
+################################################################################
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+
+################################################################################
+#
+# Library Class Section - list of Library Classes that are required for
+# this module.
+#
+################################################################################
+
+[LibraryClasses]
+ BaseLib
+
+[LibraryClasses.IA32]
+ PcdLib
+ IoLib
+
+[LibraryClasses.X64]
+ PcdLib
+ IoLib
+
+[LibraryClasses.IPF]
+ DebugLib
+
+
+################################################################################
+#
+# Pcd DYNAMIC - list of PCDs that this module is coded for.
+#
+################################################################################
+
+[PcdsDynamic.IA32]
+ PcdFSBClock|gEfiMdePkgTokenSpaceGuid
+
+[PcdsDynamic.X64]
+ PcdFSBClock|gEfiMdePkgTokenSpaceGuid
+
diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.msa b/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.msa new file mode 100644 index 0000000000..d6126f74e7 --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.msa @@ -0,0 +1,64 @@ +<?xml version="1.0" encoding="UTF-8"?>
+<ModuleSurfaceArea xmlns="http://www.TianoCore.org/2006/Edk2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+ <MsaHeader>
+ <ModuleName>SecPeiDxeTimerLibCpu</ModuleName>
+ <ModuleType>BASE</ModuleType>
+ <GuidValue>b5a05743-9b71-489b-a0ed-a0eb3950d23b</GuidValue>
+ <Version>1.0</Version>
+ <Abstract>Timer Library implementation for Boot Timer moudles that require timer services.</Abstract>
+ <Description>Timer Library that uses CPU resources to provide calibrated + delays on IA-32 and x64, and uses ITC on IPF. Note: Because CpuLocalApci + and ITC could be programmed by OS, it cannot be used by SMM drivers + and runtime drivers, ACPI timer is recommended for SMM drivers and RUNTIME + drivers.</Description>
+ <Copyright>Copyright (c) 2006 - 2007, Intel Corporation.</Copyright>
+ <License>All rights reserved. This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.</License>
+ <Specification>FRAMEWORK_BUILD_PACKAGING_SPECIFICATION 0x00000052</Specification>
+ </MsaHeader>
+ <ModuleDefinitions>
+ <SupportedArchitectures>IA32 X64 IPF</SupportedArchitectures>
+ <BinaryModule>false</BinaryModule>
+ <OutputFileBasename>SecPeiDxeTimerLibCpu</OutputFileBasename>
+ </ModuleDefinitions>
+ <LibraryClassDefinitions>
+ <LibraryClass Usage="ALWAYS_PRODUCED" SupModuleList="BASE DXE_CORE DXE_DRIVER DXE_SAL_DRIVER PEIM PEI_CORE SEC UEFI_APPLICATION UEFI_DRIVER">
+ <Keyword>TimerLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>BaseLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED" SupArchList="IA32 X64">
+ <Keyword>IoLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED" SupArchList="IPF">
+ <Keyword>DebugLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED" SupArchList="IA32 X64">
+ <Keyword>PcdLib</Keyword>
+ </LibraryClass>
+ </LibraryClassDefinitions>
+ <SourceFiles>
+ <Filename SupArchList="IA32">x86TimerLib.c</Filename>
+ <Filename SupArchList="X64">x86TimerLib.c</Filename>
+ <Filename SupArchList="IPF">IpfTimerLib.c</Filename>
+ </SourceFiles>
+ <PackageDependencies>
+ <Package PackageGuid="5e0e9358-46b6-4ae2-8218-4ab8b9bbdcec"/>
+ </PackageDependencies>
+ <Externs>
+ <Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>
+ <Specification>EDK_RELEASE_VERSION 0x00020000</Specification>
+ </Externs>
+ <PcdCoded>
+ <PcdEntry PcdItemType="DYNAMIC" Usage="ALWAYS_CONSUMED" SupArchList="IA32 X64">
+ <C_Name>PcdFSBClock</C_Name>
+ <TokenSpaceGuidCName>gEfiMdePkgTokenSpaceGuid</TokenSpaceGuidCName>
+ <HelpText>This value is FSB Clock frequency. Its unit is Hz and its default value is 200000000, that means FSB frequency is 200Mhz.</HelpText>
+ </PcdEntry>
+ </PcdCoded>
+</ModuleSurfaceArea>
\ No newline at end of file diff --git a/MdePkg/Library/SecPeiDxeTimerLibCpu/x86TimerLib.c b/MdePkg/Library/SecPeiDxeTimerLibCpu/x86TimerLib.c new file mode 100644 index 0000000000..24ee2e7d73 --- /dev/null +++ b/MdePkg/Library/SecPeiDxeTimerLibCpu/x86TimerLib.c @@ -0,0 +1,251 @@ +/** @file
+ Timer Library functions built upon local APIC on IA32/x64.
+
+ Copyright (c) 2006 - 2007, Intel Corporation<BR>
+ All rights reserved. This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+ Module Name: x86TimerLib.c
+
+**/
+
+//
+// Include common header file for this module.
+//
+#include "CommonHeader.h"
+
+//
+// The following array is used in calculating the frequency of local APIC
+// timer. Refer to IA-32 developers' manual for more details.
+//
+GLOBAL_REMOVE_IF_UNREFERENCED
+CONST UINT8 mTimerLibLocalApicDivisor[] = {
+ 0x02, 0x04, 0x08, 0x10,
+ 0x02, 0x04, 0x08, 0x10,
+ 0x20, 0x40, 0x80, 0x01,
+ 0x20, 0x40, 0x80, 0x01
+};
+
+/**
+ Internal function to retrieve the base address of local APIC.
+
+ Internal function to retrieve the base address of local APIC.
+
+ @return The base address of local APIC
+
+**/
+STATIC
+UINTN
+InternalX86GetApicBase (
+ VOID
+ )
+{
+ return (UINTN)AsmMsrBitFieldRead64 (27, 12, 35) << 12;
+}
+
+/**
+ Internal function to return the frequency of the local APIC timer.
+
+ Internal function to return the frequency of the local APIC timer.
+
+ @param ApicBase The base address of memory mapped registers of local APIC.
+
+ @return The frequency of the timer in Hz.
+
+**/
+STATIC
+UINT32
+InternalX86GetTimerFrequency (
+ IN UINTN ApicBase
+ )
+{
+ return
+ PcdGet32(PcdFSBClock) /
+ mTimerLibLocalApicDivisor[MmioBitFieldRead32 (ApicBase + 0x3e0, 0, 3)];
+}
+
+/**
+ Internal function to read the current tick counter of local APIC.
+
+ Internal function to read the current tick counter of local APIC.
+
+ @param ApicBase The base address of memory mapped registers of local APIC.
+
+ @return The tick counter read.
+
+**/
+STATIC
+INT32
+InternalX86GetTimerTick (
+ IN UINTN ApicBase
+ )
+{
+ return MmioRead32 (ApicBase + 0x390);
+}
+
+/**
+ Stalls the CPU for at least the given number of ticks.
+
+ Stalls the CPU for at least the given number of ticks. It's invoked by
+ MicroSecondDelay() and NanoSecondDelay().
+
+ @param ApicBase The base address of memory mapped registers of local APIC.
+ @param Delay A period of time to delay in ticks.
+
+**/
+STATIC
+VOID
+InternalX86Delay (
+ IN UINTN ApicBase,
+ IN UINT32 Delay
+ )
+{
+ INT32 Ticks;
+
+ //
+ // The target timer count is calculated here
+ //
+ Ticks = InternalX86GetTimerTick (ApicBase) - Delay;
+
+ //
+ // Wait until time out
+ // Delay > 2^31 could not be handled by this function
+ // Timer wrap-arounds are handled correctly by this function
+ //
+ while (InternalX86GetTimerTick (ApicBase) - Ticks >= 0);
+}
+
+/**
+ Stalls the CPU for at least the given number of microseconds.
+
+ Stalls the CPU for the number of microseconds specified by MicroSeconds.
+
+ @param MicroSeconds The minimum number of microseconds to delay.
+
+ @return MicroSeconds
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+ IN UINTN MicroSeconds
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+ InternalX86Delay (
+ ApicBase,
+ (UINT32)DivU64x32 (
+ MultU64x64 (
+ InternalX86GetTimerFrequency (ApicBase),
+ MicroSeconds
+ ),
+ 1000000u
+ )
+ );
+ return MicroSeconds;
+}
+
+/**
+ Stalls the CPU for at least the given number of nanoseconds.
+
+ Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
+
+ @param NanoSeconds The minimum number of nanoseconds to delay.
+
+ @return NanoSeconds
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+ IN UINTN NanoSeconds
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+ InternalX86Delay (
+ ApicBase,
+ (UINT32)DivU64x32 (
+ MultU64x64 (
+ InternalX86GetTimerFrequency (ApicBase),
+ NanoSeconds
+ ),
+ 1000000000u
+ )
+ );
+ return NanoSeconds;
+}
+
+/**
+ Retrieves the current value of a 64-bit free running performance counter.
+
+ Retrieves the current value of a 64-bit free running performance counter. The
+ counter can either count up by 1 or count down by 1. If the physical
+ performance counter counts by a larger increment, then the counter values
+ must be translated. The properties of the counter can be retrieved from
+ GetPerformanceCounterProperties().
+
+ @return The current value of the free running performance counter.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounter (
+ VOID
+ )
+{
+ return (UINT64)(UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());
+}
+
+/**
+ Retrieves the 64-bit frequency in Hz and the range of performance counter
+ values.
+
+ If StartValue is not NULL, then the value that the performance counter starts
+ with immediately after is it rolls over is returned in StartValue. If
+ EndValue is not NULL, then the value that the performance counter end with
+ immediately before it rolls over is returned in EndValue. The 64-bit
+ frequency of the performance counter in Hz is always returned. If StartValue
+ is less than EndValue, then the performance counter counts up. If StartValue
+ is greater than EndValue, then the performance counter counts down. For
+ example, a 64-bit free running counter that counts up would have a StartValue
+ of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
+ that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
+
+ @param StartValue The value the performance counter starts with when it
+ rolls over.
+ @param EndValue The value that the performance counter ends with before
+ it rolls over.
+
+ @return The frequency in Hz.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+ OUT UINT64 *StartValue, OPTIONAL
+ OUT UINT64 *EndValue OPTIONAL
+ )
+{
+ UINTN ApicBase;
+
+ ApicBase = InternalX86GetApicBase ();
+
+ if (StartValue != NULL) {
+ *StartValue = MmioRead32 (ApicBase + 0x380);
+ }
+
+ if (EndValue != NULL) {
+ *EndValue = 0;
+ }
+
+ return (UINT64) InternalX86GetTimerFrequency (ApicBase);;
+}
|