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Added generic function for calculating ACPI table checksum

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This commit is contained in:
Michael Brown 2006-08-27 22:02:08 +00:00
parent c46126bfa4
commit 22511400c7
2 changed files with 42 additions and 0 deletions
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40
src/core/acpi.c Normal file
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@ -0,0 +1,40 @@
/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <gpxe/acpi.h>
/** @file
*
* ACPI support functions
*
*/
/**
* Fix up ACPI table checksum
*
* @v acpi ACPI table header
*/
void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
unsigned int i = 0;
uint8_t sum = 0;
for ( i = 0 ; i < acpi->length ; i++ ) {
sum += *( ( ( uint8_t * ) acpi ) + i );
}
acpi->checksum -= sum;
}

2
src/include/gpxe/acpi.h
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@ -36,4 +36,6 @@ struct acpi_description_header {
uint32_t asl_compiler_revision;
} __attribute__ (( packed ));
extern void acpi_fix_checksum ( struct acpi_description_header *acpi );
#endif /* _GPXE_ACPI_H */