1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
|
/******************************************************************************
*
* Module Name: utcksum - Support generating table checksums
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2025, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include "acpi.h"
#include "accommon.h"
#include "acdisasm.h"
#include "acutils.h"
/* This module used for application-level code only */
#define _COMPONENT ACPI_CA_DISASSEMBLER
ACPI_MODULE_NAME ("utcksum")
/*******************************************************************************
*
* FUNCTION: AcpiUtVerifyChecksum
*
* PARAMETERS: Table - ACPI table to verify
* Length - Length of entire table
*
* RETURN: Status
*
* DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
* exception on bad checksum.
* Note: We don't have to check for a CDAT here, since CDAT is
* not in the RSDT/XSDT, and the CDAT table is never installed
* via ACPICA.
*
******************************************************************************/
ACPI_STATUS
AcpiUtVerifyChecksum (
ACPI_TABLE_HEADER *Table,
UINT32 Length)
{
UINT8 Checksum;
/*
* FACS/S3PT:
* They are the odd tables, have no standard ACPI header and no checksum
*/
if (ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_S3PT) ||
ACPI_COMPARE_NAMESEG (Table->Signature, ACPI_SIG_FACS))
{
return (AE_OK);
}
/* Compute the checksum on the table */
Length = Table->Length;
Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, Table), Length, Table->Checksum);
/* Computed checksum matches table? */
if (Checksum != Table->Checksum)
{
ACPI_BIOS_WARNING ((AE_INFO,
"Incorrect checksum in table [%4.4s] - 0x%2.2X, "
"should be 0x%2.2X",
Table->Signature, Table->Checksum,
Table->Checksum - Checksum));
#if (ACPI_CHECKSUM_ABORT)
return (AE_BAD_CHECKSUM);
#endif
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtVerifyCdatChecksum
*
* PARAMETERS: Table - CDAT ACPI table to verify
* Length - Length of entire table
*
* RETURN: Status
*
* DESCRIPTION: Verifies that the CDAT table checksums to zero. Optionally
* returns an exception on bad checksum.
*
******************************************************************************/
ACPI_STATUS
AcpiUtVerifyCdatChecksum (
ACPI_TABLE_CDAT *CdatTable,
UINT32 Length)
{
UINT8 Checksum;
/* Compute the checksum on the table */
Checksum = AcpiUtGenerateChecksum (ACPI_CAST_PTR (UINT8, CdatTable),
CdatTable->Length, CdatTable->Checksum);
/* Computed checksum matches table? */
if (Checksum != CdatTable->Checksum)
{
ACPI_BIOS_WARNING ((AE_INFO,
"Incorrect checksum in table [%4.4s] - 0x%2.2X, "
"should be 0x%2.2X",
AcpiGbl_CDAT, CdatTable->Checksum, Checksum));
#if (ACPI_CHECKSUM_ABORT)
return (AE_BAD_CHECKSUM);
#endif
}
CdatTable->Checksum = Checksum;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtGenerateChecksum
*
* PARAMETERS: Table - Pointer to table to be checksummed
* Length - Length of the table
* OriginalChecksum - Value of the checksum field
*
* RETURN: 8 bit checksum of buffer
*
* DESCRIPTION: Computes an 8 bit checksum of the table.
*
******************************************************************************/
UINT8
AcpiUtGenerateChecksum (
void *Table,
UINT32 Length,
UINT8 OriginalChecksum)
{
UINT8 Checksum;
/* Sum the entire table as-is */
Checksum = AcpiUtChecksum ((UINT8 *) Table, Length);
/* Subtract off the existing checksum value in the table */
Checksum = (UINT8) (Checksum - OriginalChecksum);
/* Compute and return the final checksum */
Checksum = (UINT8) (0 - Checksum);
return (Checksum);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtChecksum
*
* PARAMETERS: Buffer - Pointer to memory region to be checked
* Length - Length of this memory region
*
* RETURN: Checksum (UINT8)
*
* DESCRIPTION: Calculates circular checksum of memory region.
*
******************************************************************************/
UINT8
AcpiUtChecksum (
UINT8 *Buffer,
UINT32 Length)
{
UINT8 Sum = 0;
UINT8 *End = Buffer + Length;
while (Buffer < End)
{
Sum = (UINT8) (Sum + *(Buffer++));
}
return (Sum);
}
|