Code scrub for Monotonic Counter Driver.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6554 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 47 insertions, 88 deletions

diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c
index 11e747b..9a33cc6 100644
--- a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c
+++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c
@@ -1,6 +1,6 @@
 /** @file

-  

-  Produced the Monotonic Counter Services as defined in the DXE CIS.

+  Produce the UEFI boot service GetNextMonotonicCount() and runtime service

+  GetNextHighMonotonicCount().

 

 Copyright (c) 2006 - 2008, Intel Corporation

 All rights reserved. This program and the accompanying materials

@@ -13,50 +13,59 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 

 **/

 

+#include <Uefi.h>

 

-#include "MonotonicCounter.h"

+#include <Protocol/MonotonicCounter.h>

+

+#include <Library/BaseLib.h>

+#include <Library/UefiDriverEntryPoint.h>

+#include <Library/UefiRuntimeLib.h>

+#include <Library/DebugLib.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/UefiRuntimeServicesTableLib.h>

 

 //

-// The Monotonic Counter Handle

+// The handle to install Monotonic Counter Architctural Protocol

 //

 EFI_HANDLE  mMonotonicCounterHandle = NULL;

 

 //

-// The current Monotonic count value

+// The current monotonic counter value

 //

 UINT64      mEfiMtc;

 

 //

-// Event to use to update the Mtc's high part when wrapping

+// Event to update the monotonic Counter's high part when low part overflows.

 //

 EFI_EVENT   mEfiMtcEvent;

 

 //

-// EfiMtcName - Variable name of the MTC value

+// Name of the variable for the high part of monotonic counter

 //

 CHAR16      *mEfiMtcName = (CHAR16 *) L"MTC";

 

 //

-// EfiMtcGuid - Guid of the MTC value

+// Vendor GUID of the variable for the high part of monotonic counter

 //

 EFI_GUID    mEfiMtcGuid = { 0xeb704011, 0x1402, 0x11d3, { 0x8e, 0x77, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } };

 

 /**

-  Returns the low 32 bits of the platform's monotonic counter.

+  Returns a monotonically increasing count for the platform.

 

-  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 this function.

-  This function is only available at boot services time.

-  Before calling ExitBootServices() the operating system would call this function

-  to obtain the current platform monotonic count. 

+  This function returns a 64-bit value that is numerically larger then the last

+  time the function was called.

+  The platform’s monotonic counter is comprised of two parts: the high 32 bits

+  and the low 32 bits. The low 32-bit value is volatile and is reset to zero on

+  every system reset. It is increased by 1 on every call to GetNextMonotonicCount().

+  The high 32-bit value is nonvolatile and is increased by one on whenever the

+  system resets or the low 32-bit counter overflows.

 

   @param  Count	                Pointer to returned value.

 

-  @retval EFI_INVALID_PARAMETER If Count is NULL.

-  @retval EFI_SUCCESS           Operation is successful.

-  @retval EFI_UNSUPPORTED       If this function is called at Runtime.

+  @retval EFI_SUCCESS           The next monotonic count was returned.

+  @retval EFI_DEVICE_ERROR      The device is not functioning properly.

+  @retval EFI_INVALID_PARAMETER Count is NULL.

+  @retval EFI_UNSUPPORTED       This function is called at runtime.

 

 **/

 EFI_STATUS

@@ -68,7 +77,7 @@ MonotonicCounterDriverGetNextMonotonicCount (
   EFI_TPL OldTpl;

 

   //

-  // Can not be called after ExitBootServices()

+  // Cannot be called after ExitBootServices()

   //

   if (EfiAtRuntime ()) {

     return EFI_UNSUPPORTED;

@@ -88,10 +97,10 @@ MonotonicCounterDriverGetNextMonotonicCount (
   gBS->RestoreTPL (OldTpl);

 

   //

-  // If the MSB bit of the low part toggled, then signal that the high

-  // part needs updated now

+  // If the low 32-bit counter overflows (MSB bit toggled),

+  // then signal that the high part needs update now.

   //

-  if ((((UINT32) mEfiMtc) ^ ((UINT32) *Count)) & 0x80000000) {

+  if ((((UINT32) mEfiMtc) ^ ((UINT32) *Count)) & BIT31) {

     gBS->SignalEvent (mEfiMtcEvent);

   }

 

@@ -124,11 +133,11 @@ MonotonicCounterDriverGetNextMonotonicCount (
 

   @param  HighCount	            Pointer to returned value.

 

-  @retval EFI_INVALID_PARAMETER If HighCount is NULL.

-  @retval EFI_SUCCESS           Operation is successful.

+  @retval EFI_SUCCESS           The next high monotonic count was returned.

+  @retval EFI_INVALID_PARAMETER HighCount is NULL.

+  @retval EFI_DEVICE_ERROR      The variable could not be saved due to a hardware failure.

   @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.

 

 **/

 EFI_STATUS

@@ -159,7 +168,7 @@ MonotonicCounterDriverGetNextHighMonotonicCount (
     mEfiMtc     = LShiftU64 (*HighCount, 32);

   }

   //

-  // Update the NvRam store to match the new high part

+  // Update the NV variable to match the new high part

   //

   return EfiSetVariable (

            mEfiMtcName,

@@ -172,13 +181,11 @@ MonotonicCounterDriverGetNextHighMonotonicCount (
 }

 

 /**

-  Monotonic count event handler.  This handler updates the high monotonic count.

+  Monotonic counter event handler.  This handler updates the high part of monotonic counter.

 

   @param Event           The event to handle.

   @param Context         The event context.

 

-  @return None.

-

 **/

 VOID

 EFIAPI

@@ -193,12 +200,12 @@ EfiMtcEventHandler (
 }

 

 /**

-  The initial function of monotonic counter driver.

+  Entry point of monotonic counter driver.

 

-  @param  ImageHandle     The handle of image.

-  @param  SystemTable     The pointer to system table.

+  @param  ImageHandle   The image handle of this driver.

+  @param  SystemTable   The pointer of EFI_SYSTEM_TABLE.

 

-  @return EFI_SUCCESS     The initialize action is successful.

+  @return EFI_SUCCESS   The initialization is successful.

 

 **/

 EFI_STATUS

@@ -213,12 +220,12 @@ MonotonicCounterDriverInitialize (
   UINTN       BufferSize;

 

   //

-  // Make sure the Monotonic Counter Architectural Protocol is not already installed in the system

+  // Make sure the Monotonic Counter Architectural Protocol has not been installed in the system yet.

   //

   ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiMonotonicCounterArchProtocolGuid);

 

   //

-  // Initialize event to handle overflows

+  // Initialize event to handle low-part overflow

   //

   Status = gBS->CreateEvent (

                   EVT_NOTIFY_SIGNAL,

@@ -227,7 +234,6 @@ MonotonicCounterDriverInitialize (
                   NULL,

                   &mEfiMtcEvent

                   );

-

   ASSERT_EFI_ERROR (Status);

 

   //

@@ -254,7 +260,7 @@ MonotonicCounterDriverInitialize (
   // Continue even if it fails.  It will only fail if the variable services are

   // not functional.

   //

-  Status = MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);

+  MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);

 

   //

   // Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields

diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h
deleted file mode 100644
index 0c40cd9..0000000
--- a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/** @file

-  Header file for MonotonicCounter driver.

-

-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.

-

-**/

-

-#ifndef _MONOTONIC_COUNTER_DRIVER_H_

-#define _MONOTONIC_COUNTER_DRIVER_H_

-

-

-#include <Uefi.h>

-

-#include <Protocol/MonotonicCounter.h>

-

-#include <Library/BaseLib.h>

-#include <Library/UefiDriverEntryPoint.h>

-#include <Library/UefiRuntimeLib.h>

-#include <Library/DebugLib.h>

-#include <Library/UefiBootServicesTableLib.h>

-#include <Library/UefiRuntimeServicesTableLib.h>

-

-/**

-  The initial function of monotonic counter driver.

-

-  @param  ImageHandle     The handle of image.

-  @param  SystemTable     The pointer to system table.

-

-  @return EFI_SUCCESS     The initialize action is successful.

-

-**/

-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
index 592e894..ba518ea 100644
--- a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf
+++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf
@@ -1,8 +1,8 @@
 #/** @file

-# Component description file for MonotonicCounter module.

+# This module produces the UEFI boot service GetNextMonotonicCount()

+# and runtime service GetNextHighMonotonicCount().

 #

-# This module produces UEFI Monotonic Counter Boot and Runtime Services.

-# Copyright (c) 2006 - 2007, Intel Corporation

+# Copyright (c) 2006 - 2008, 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

@@ -32,7 +32,6 @@
 #

 

 [Sources.common]

-  MonotonicCounter.h

   MonotonicCounter.c