mirror of https://github.com/acidanthera/audk.git
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
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/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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Crc32.c
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Abstract:
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CalculateCrc32 Boot Services as defined in DXE CIS.
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This Boot Services is in the Runtime Driver because this service is
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also required by SetVirtualAddressMap() when the EFI System Table and
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EFI Runtime Services Table are converted from physical address to
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virtual addresses. This requires that the 32-bit CRC be recomputed.
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Revision History:
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--*/
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#include "Runtime.h"
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UINT32 mCrcTable[256];
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EFI_STATUS
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EFIAPI
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RuntimeDriverCalculateCrc32 (
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IN VOID *Data,
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IN UINTN DataSize,
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OUT UINT32 *CrcOut
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)
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/*++
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Routine Description:
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Arguments:
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Returns:
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--*/
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{
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UINT32 Crc;
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UINTN Index;
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UINT8 *Ptr;
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if (Data == NULL || DataSize == 0 || CrcOut == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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Crc = 0xffffffff;
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for (Index = 0, Ptr = Data; Index < DataSize; Index++, Ptr++) {
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Crc = (Crc >> 8) ^ mCrcTable[(UINT8) Crc ^ *Ptr];
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}
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*CrcOut = Crc ^ 0xffffffff;
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return EFI_SUCCESS;
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}
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UINT32
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ReverseBits (
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UINT32 Value
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)
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/*++
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Routine Description:
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Arguments:
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Returns:
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--*/
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{
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UINTN Index;
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UINT32 NewValue;
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NewValue = 0;
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for (Index = 0; Index < 32; Index++) {
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if (Value & (1 << Index)) {
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NewValue = NewValue | (1 << (31 - Index));
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}
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}
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return NewValue;
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}
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VOID
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RuntimeDriverInitializeCrc32Table (
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VOID
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)
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/*++
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Routine Description:
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Arguments:
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Returns:
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--*/
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{
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UINTN TableEntry;
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UINTN Index;
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UINT32 Value;
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for (TableEntry = 0; TableEntry < 256; TableEntry++) {
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Value = ReverseBits ((UINT32) TableEntry);
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for (Index = 0; Index < 8; Index++) {
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if (Value & 0x80000000) {
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Value = (Value << 1) ^ 0x04c11db7;
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} else {
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Value = Value << 1;
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}
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}
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mCrcTable[TableEntry] = ReverseBits (Value);
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}
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}
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