X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdeModulePkg%2FCore%2FRuntimeDxe%2FCrc32.c;h=c271856015bef1deda3bc813865380b517b5d5c4;hb=9917def3294bac4d14cd86ba382652aa41c6c1d6;hp=14370dbc7d9b4d5d51ff13d95ab73468b0d3a461;hpb=9920ae74af5a38672ddde0a997a7ec0960c96275;p=mirror_edk2.git

diff --git a/MdeModulePkg/Core/RuntimeDxe/Crc32.c b/MdeModulePkg/Core/RuntimeDxe/Crc32.c
index 14370dbc7d..c271856015 100644
--- a/MdeModulePkg/Core/RuntimeDxe/Crc32.c
+++ b/MdeModulePkg/Core/RuntimeDxe/Crc32.c
@@ -1,13 +1,14 @@
 /** @file
-  CalculateCrc32 Boot Services as defined in DXE CIS.
+  This file implements CalculateCrc32 Boot Services as defined in
+  Platform Initialization specification 1.0 VOLUME 2 DXE Core Interface.
 
   This Boot Services is in the Runtime Driver because this service is
   also required by SetVirtualAddressMap() when the EFI System Table and
   EFI Runtime Services Table are converted from physical address to
-  virtual addresses.	This requires that the 32-bit CRC be recomputed.
+  virtual addresses.  This requires that the 32-bit CRC be recomputed.
 
-Copyright (c) 2006, Intel Corporation. <BR>
-All rights reserved. This program and the accompanying materials
+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+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
@@ -18,9 +19,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 **/
 
 
-#include <PiDxe.h>
-
-UINT32  mCrcTable[256];
+#include <Uefi.h>
+#include <Library/BaseLib.h>
 
 /**
   Calculate CRC32 for target data.
@@ -42,73 +42,10 @@ RuntimeDriverCalculateCrc32 (
   OUT UINT32  *CrcOut
   )
 {
-  UINT32  Crc;
-  UINTN   Index;
-  UINT8   *Ptr;
-
   if (Data == NULL || DataSize == 0 || CrcOut == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
-  Crc = 0xffffffff;
-  for (Index = 0, Ptr = Data; Index < DataSize; Index++, Ptr++) {
-    Crc = (Crc >> 8) ^ mCrcTable[(UINT8) Crc ^ *Ptr];
-  }
-
-  *CrcOut = Crc ^ 0xffffffff;
+  *CrcOut = CalculateCrc32 (Data, DataSize);
   return EFI_SUCCESS;
 }
-
-
-/**
-  Reverse bits for 32bit data.
-  This is a internal function.
-
-  @param  Value                 The data to be reversed.
-
-  @return                       Data reversed.
-
-**/
-UINT32
-ReverseBits (
-  UINT32  Value
-  )
-{
-  UINTN   Index;
-  UINT32  NewValue;
-
-  NewValue = 0;
-  for (Index = 0; Index < 32; Index++) {
-    if ((Value & (1 << Index)) != 0) {
-      NewValue = NewValue | (1 << (31 - Index));
-    }
-  }
-
-  return NewValue;
-}
-
-/**
-  Initialize CRC32 table.
-**/
-VOID
-RuntimeDriverInitializeCrc32Table (
-  VOID
-  )
-{
-  UINTN   TableEntry;
-  UINTN   Index;
-  UINT32  Value;
-
-  for (TableEntry = 0; TableEntry < 256; TableEntry++) {
-    Value = ReverseBits ((UINT32) TableEntry);
-    for (Index = 0; Index < 8; Index++) {
-      if ((Value & 0x80000000) != 0) {
-        Value = (Value << 1) ^ 0x04c11db7;
-      } else {
-        Value = Value << 1;
-      }
-    }
-
-    mCrcTable[TableEntry] = ReverseBits (Value);
-  }
-}