diff options
Diffstat (limited to 'MdeModulePkg/Universal/MonotonicCounterRuntimeDxe')
4 files changed, 515 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c new file mode 100644 index 0000000000..31efab323a --- /dev/null +++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c @@ -0,0 +1,299 @@ +/*++
+
+Copyright (c) 2006 - 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.
+
+Module Name:
+
+ MonotonicCounter.c
+
+Abstract:
+
+ Produced the Monotonic Counter Services as defined in the DXE CIS
+
+Revision History:
+
+--*/
+
+#include "MonotonicCounter.h"
+
+//
+// The Monotonic Counter Handle
+//
+EFI_HANDLE mMonotonicCounterHandle = NULL;
+
+//
+// The current Monotonic count value
+//
+UINT64 mEfiMtc;
+
+//
+// Event to use to update the Mtc's high part when wrapping
+//
+EFI_EVENT mEfiMtcEvent;
+
+//
+// EfiMtcName - Variable name of the MTC value
+//
+CHAR16 *mEfiMtcName = (CHAR16 *) L"MTC";
+
+//
+// EfiMtcGuid - Guid of the MTC value
+//
+EFI_GUID mEfiMtcGuid = { 0xeb704011, 0x1402, 0x11d3, { 0x8e, 0x77, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } };
+
+//
+// Worker functions
+//
+STATIC
+EFI_STATUS
+EFIAPI
+MonotonicCounterDriverGetNextMonotonicCount (
+ OUT UINT64 *Count
+ )
+/*++
+
+Routine Description:
+
+Arguments:
+
+Returns:
+
+--*/
+{
+ EFI_TPL OldTpl;
+
+ //
+ // Can not be called after ExitBootServices()
+ //
+ if (EfiAtRuntime ()) {
+ return EFI_UNSUPPORTED;
+ }
+ //
+ // Check input parameters
+ //
+ if (Count == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Update the monotonic counter with a lock
+ //
+ OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ *Count = mEfiMtc;
+ mEfiMtc++;
+ gBS->RestoreTPL (OldTpl);
+
+ //
+ // If the MSB bit of the low part toggled, then signal that the high
+ // part needs updated now
+ //
+ if ((((UINT32) mEfiMtc) ^ ((UINT32) *Count)) & 0x80000000) {
+ gBS->SignalEvent (mEfiMtcEvent);
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Returns the next high 32 bits of the platform's monotonic counter.
+
+ The GetNextHighMonotonicCount() function returns the next high 32 bits
+ of the platform's monotonic counter. The platform's monotonic counter is
+ comprised of two 32 bit quantities: the high 32 bits and the low 32 bits.
+ During boot service time the low 32 bit value is volatile: it is reset to
+ zero on every system reset and is increased by 1 on every call to GetNextMonotonicCount().
+ The high 32 bit value is non-volatile and is increased by 1 whenever the system resets
+ or whenever the low 32 bit count [returned by GetNextMonoticCount()] overflows.
+ The GetNextMonotonicCount() function is only available at boot services time.
+ If the operating system wishes to extend the platform monotonic counter to runtime,
+ it may do so by utilizing GetNextHighMonotonicCount(). To do this, before calling
+ ExitBootServices() the operating system would call GetNextMonotonicCount() to obtain
+ the current platform monotonic count. The operating system would then provide an
+ interface that returns the next count by:
+ Adding 1 to the last count.
+ Before the lower 32 bits of the count overflows, call GetNextHighMonotonicCount().
+ This will increase the high 32 bits of the platform's non-volatile portion of the monotonic
+ count by 1.
+
+ This function may only be called at Runtime.
+
+ @param[out] HighCount Pointer to returned value.
+
+ @retval EFI_INVALID_PARAMETER If HighCount is NULL.
+ @retval EFI_SUCCESS Operation is successful.
+ @retval EFI_OUT_OF_RESOURCES If variable service reports that not enough storage
+ is available to hold the variable and its data.
+ @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+MonotonicCounterDriverGetNextHighMonotonicCount (
+ OUT UINT32 *HighCount
+ )
+/*++
+
+Routine Description:
+
+Arguments:
+
+Returns:
+
+--*/
+{
+ EFI_TPL OldTpl;
+
+ //
+ // Check input parameters
+ //
+ if (HighCount == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (!EfiAtRuntime ()) {
+ //
+ // Use a lock if called before ExitBootServices()
+ //
+ OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ *HighCount = (UINT32) RShiftU64 (mEfiMtc, 32) + 1;
+ mEfiMtc = LShiftU64 (*HighCount, 32);
+ gBS->RestoreTPL (OldTpl);
+ } else {
+ *HighCount = (UINT32) RShiftU64 (mEfiMtc, 32) + 1;
+ mEfiMtc = LShiftU64 (*HighCount, 32);
+ }
+ //
+ // Update the NvRam store to match the new high part
+ //
+ return EfiSetVariable (
+ mEfiMtcName,
+ &mEfiMtcGuid,
+ EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS,
+ sizeof (UINT32),
+ HighCount
+ );
+
+}
+
+STATIC
+VOID
+EFIAPI
+EfiMtcEventHandler (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+/*++
+
+Routine Description:
+
+ Monotonic count event handler. This handler updates the high monotonic count.
+
+Arguments:
+
+ Event The event to handle
+ Context The event context
+
+Returns:
+
+ EFI_SUCCESS The event has been handled properly
+ EFI_NOT_FOUND An error occurred updating the variable.
+
+--*/
+{
+ UINT32 HighCount;
+
+ MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);
+}
+
+EFI_STATUS
+EFIAPI
+MonotonicCounterDriverInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+/*++
+
+Routine Description:
+
+Arguments:
+ (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)
+
+Returns:
+
+--*/
+{
+ EFI_STATUS Status;
+ UINT32 HighCount;
+ UINTN BufferSize;
+
+ //
+ // Make sure the Monotonic Counter Architectural Protocol is not already installed in the system
+ //
+ ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiMonotonicCounterArchProtocolGuid);
+
+ //
+ // Initialize event to handle overflows
+ //
+ Status = gBS->CreateEvent (
+ EVT_NOTIFY_SIGNAL,
+ TPL_CALLBACK,
+ EfiMtcEventHandler,
+ NULL,
+ &mEfiMtcEvent
+ );
+
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Read the last high part
+ //
+ BufferSize = sizeof (UINT32);
+ Status = EfiGetVariable (
+ mEfiMtcName,
+ &mEfiMtcGuid,
+ NULL,
+ &BufferSize,
+ &HighCount
+ );
+ if (EFI_ERROR (Status)) {
+ HighCount = 0;
+ }
+ //
+ // Set the current value
+ //
+ mEfiMtc = LShiftU64 (HighCount, 32);
+
+ //
+ // Increment the upper 32 bits for this boot
+ // Continue even if it fails. It will only fail if the variable services are
+ // not functional.
+ //
+ Status = MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);
+
+ //
+ // Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields
+ //
+ gBS->GetNextMonotonicCount = MonotonicCounterDriverGetNextMonotonicCount;
+ gRT->GetNextHighMonotonicCount = MonotonicCounterDriverGetNextHighMonotonicCount;
+
+ //
+ // Install the Monotonic Counter Architctural Protocol onto a new handle
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &mMonotonicCounterHandle,
+ &gEfiMonotonicCounterArchProtocolGuid,
+ NULL,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h new file mode 100644 index 0000000000..c1ef509f77 --- /dev/null +++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h @@ -0,0 +1,54 @@ +/*++
+
+Copyright (c) 2006, 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.
+
+Module Name:
+
+ MonotonicCounter.h
+
+Abstract:
+
+ Produces the Monotonic Counter services as defined in the DXE CIS
+
+--*/
+
+#ifndef _MONOTONIC_COUNTER_DRIVER_H_
+#define _MONOTONIC_COUNTER_DRIVER_H_
+
+//
+// The package level header files this module uses
+//
+#include <PiDxe.h>
+//
+// The protocols, PPI and GUID defintions for this module
+//
+#include <Protocol/MonotonicCounter.h>
+//
+// The Library classes this module consumes
+//
+#include <Library/BaseLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/UefiRuntimeLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+
+//
+// Function Prototypes
+//
+EFI_STATUS
+EFIAPI
+MonotonicCounterDriverInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+;
+
+#endif
diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf new file mode 100644 index 0000000000..4b3ac22791 --- /dev/null +++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf @@ -0,0 +1,97 @@ +#/** @file
+# Component description file for MonotonicCounter module.
+#
+# This module produces UEFI Monotonic Counter Boot and Runtime Services.
+# Copyright (c) 2006 - 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 = MonotonicCounterRuntimeDxe
+ FILE_GUID = AD608272-D07F-4964-801E-7BD3B7888652
+ MODULE_TYPE = DXE_RUNTIME_DRIVER
+ VERSION_STRING = 1.0
+ EDK_RELEASE_VERSION = 0x00020000
+ EFI_SPECIFICATION_VERSION = 0x00020000
+
+ ENTRY_POINT = MonotonicCounterDriverInitialize
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF EBC
+#
+
+################################################################################
+#
+# Sources Section - list of files that are required for the build to succeed.
+#
+################################################################################
+
+[Sources.common]
+ MonotonicCounter.h
+ MonotonicCounter.c
+
+
+################################################################################
+#
+# 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]
+ UefiRuntimeServicesTableLib
+ UefiBootServicesTableLib
+ DebugLib
+ UefiRuntimeLib
+ UefiDriverEntryPoint
+ BaseLib
+
+
+################################################################################
+#
+# Protocol C Name Section - list of Protocol and Protocol Notify C Names
+# that this module uses or produces.
+#
+################################################################################
+
+[Protocols]
+ gEfiMonotonicCounterArchProtocolGuid # PROTOCOL ALWAYS_PRODUCED
+
+
+################################################################################
+#
+# Dependency Expression Section - list of Dependency expressions that are required for
+# this module.
+#
+################################################################################
+
+[Depex]
+ gEfiVariableArchProtocolGuid AND gEfiVariableWriteArchProtocolGuid
+
diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.msa b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.msa new file mode 100644 index 0000000000..291f2ea680 --- /dev/null +++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.msa @@ -0,0 +1,65 @@ +<?xml version="1.0" encoding="UTF-8"?>
+<ModuleSurfaceArea xmlns="http://www.TianoCore.org/2006/Edk2.0">
+ <MsaHeader>
+ <ModuleName>MonotonicCounter</ModuleName>
+ <ModuleType>DXE_RUNTIME_DRIVER</ModuleType>
+ <GuidValue>AD608272-D07F-4964-801E-7BD3B7888652</GuidValue>
+ <Version>1.0</Version>
+ <Abstract>Component description file for MonotonicCounter module.</Abstract>
+ <Description>This module produces UEFI Monotonic Counter Boot and Runtime Services.</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 EBC</SupportedArchitectures>
+ <BinaryModule>false</BinaryModule>
+ <OutputFileBasename>MonotonicCounter</OutputFileBasename>
+ </ModuleDefinitions>
+ <LibraryClassDefinitions>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>BaseLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>UefiDriverEntryPoint</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>UefiRuntimeLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED" RecommendedInstanceGuid="bda39d3a-451b-4350-8266-81ab10fa0523">
+ <Keyword>DebugLib</Keyword>
+ <HelpText>Recommended libary Instance is PeiDxeDebugLibReportStatusCode instance in MdePkg.</HelpText>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>UefiBootServicesTableLib</Keyword>
+ </LibraryClass>
+ <LibraryClass Usage="ALWAYS_CONSUMED">
+ <Keyword>UefiRuntimeServicesTableLib</Keyword>
+ </LibraryClass>
+ </LibraryClassDefinitions>
+ <SourceFiles>
+ <Filename>MonotonicCounter.c</Filename>
+ <Filename>MonotonicCounter.h</Filename>
+ <Filename>MonotonicCounter.dxs</Filename>
+ </SourceFiles>
+ <PackageDependencies>
+ <Package PackageGuid="5e0e9358-46b6-4ae2-8218-4ab8b9bbdcec"/>
+ </PackageDependencies>
+ <Protocols>
+ <Protocol Usage="ALWAYS_PRODUCED">
+ <ProtocolCName>gEfiMonotonicCounterArchProtocolGuid</ProtocolCName>
+ </Protocol>
+ </Protocols>
+ <Externs>
+ <Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>
+ <Specification>EDK_RELEASE_VERSION 0x00020000</Specification>
+ <Extern>
+ <ModuleEntryPoint>MonotonicCounterDriverInitialize</ModuleEntryPoint>
+ </Extern>
+ </Externs>
+</ModuleSurfaceArea>
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