From 22511400c7924020c09df90cd5a0b491b17688f9 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Sun, 27 Aug 2006 22:02:08 +0000 Subject: [PATCH] Added generic function for calculating ACPI table checksum --- src/core/acpi.c | 40 ++++++++++++++++++++++++++++++++++++++++ src/include/gpxe/acpi.h | 2 ++ 2 files changed, 42 insertions(+) create mode 100644 src/core/acpi.c diff --git a/src/core/acpi.c b/src/core/acpi.c new file mode 100644 index 00000000..94b7b2a1 --- /dev/null +++ b/src/core/acpi.c @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2006 Michael Brown . + * + * 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 + +/** @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; +} diff --git a/src/include/gpxe/acpi.h b/src/include/gpxe/acpi.h index a9632187..33b1b2b7 100644 --- a/src/include/gpxe/acpi.h +++ b/src/include/gpxe/acpi.h @@ -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 */