Added generic function for calculating ACPI table checksum
This commit is contained in:
parent
c46126bfa4
commit
22511400c7
|
@ -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;
|
||||||
|
}
|
|
@ -36,4 +36,6 @@ struct acpi_description_header {
|
||||||
uint32_t asl_compiler_revision;
|
uint32_t asl_compiler_revision;
|
||||||
} __attribute__ (( packed ));
|
} __attribute__ (( packed ));
|
||||||
|
|
||||||
|
extern void acpi_fix_checksum ( struct acpi_description_header *acpi );
|
||||||
|
|
||||||
#endif /* _GPXE_ACPI_H */
|
#endif /* _GPXE_ACPI_H */
|
||||||
|
|
Reference in New Issue