/*
* Copyright (C) 2008 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <gpxe/settings.h>
#include <gpxe/init.h>
#include <gpxe/uuid.h>
#include <gpxe/smbios.h>
/** SMBIOS settings tag magic number */
#define SMBIOS_TAG_MAGIC 0x5B /* "SmBios" */
/**
* Construct SMBIOS empty tag
*
* @ret tag SMBIOS setting tag
*/
#define SMBIOS_EMPTY_TAG ( SMBIOS_TAG_MAGIC << 24 )
/**
* Construct SMBIOS raw-data tag
*
* @v _type SMBIOS structure type number
* @v _structure SMBIOS structure data type
* @v _field Field within SMBIOS structure data type
* @ret tag SMBIOS setting tag
*/
#define SMBIOS_RAW_TAG( _type, _structure, _field ) \
( ( SMBIOS_TAG_MAGIC << 24 ) | \
( (_type) << 16 ) | \
( offsetof ( _structure, _field ) << 8 ) | \
( sizeof ( ( ( _structure * ) 0 )->_field ) ) )
/**
* Construct SMBIOS string tag
*
* @v _type SMBIOS structure type number
* @v _structure SMBIOS structure data type
* @v _field Field within SMBIOS structure data type
* @ret tag SMBIOS setting tag
*/
#define SMBIOS_STRING_TAG( _type, _structure, _field ) \
( ( SMBIOS_TAG_MAGIC << 24 ) | \
( (_type) << 16 ) | \
( offsetof ( _structure, _field ) << 8 ) )
/**
* Fetch value of SMBIOS setting
*
* @v settings Settings block, or NULL to search all blocks
* @v setting Setting to fetch
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int smbios_fetch ( struct settings *settings __unused,
struct setting *setting,
void *data, size_t len ) {
struct smbios_structure structure;
unsigned int tag_magic;
unsigned int tag_type;
unsigned int tag_offset;
unsigned int tag_len;
int rc;
/* Split tag into type, offset and length */
tag_magic = ( setting->tag >> 24 );
tag_type = ( ( setting->tag >> 16 ) & 0xff );
tag_offset = ( ( setting->tag >> 8 ) & 0xff );
tag_len = ( setting->tag & 0xff );
if ( tag_magic != SMBIOS_TAG_MAGIC )
return -ENOENT;
/* Find SMBIOS structure */
if ( ( rc = find_smbios_structure ( tag_type, &structure ) ) != 0 )
return rc;
{
uint8_t buf[structure.header.len];
/* Read SMBIOS structure */
if ( ( rc = read_smbios_structure ( &structure, buf,
sizeof ( buf ) ) ) != 0 )
return rc;
if ( tag_len == 0 ) {
/* String */
return read_smbios_string ( &structure,
buf[tag_offset],
data, len );
} else {
/* Raw data */
if ( len > tag_len )
len = tag_len;
memcpy ( data, &buf[tag_offset], len );
return tag_len;
}
}
}
/** SMBIOS settings operations */
static struct settings_operations smbios_settings_operations = {
.fetch = smbios_fetch,
};
/** SMBIOS settings */
static struct settings smbios_settings = {
.refcnt = NULL,
.name = "smbios",
.tag_magic = SMBIOS_EMPTY_TAG,
.siblings = LIST_HEAD_INIT ( smbios_settings.siblings ),
.children = LIST_HEAD_INIT ( smbios_settings.children ),
.op = &smbios_settings_operations,
};
/** Initialise SMBIOS settings */
static void smbios_init ( void ) {
int rc;
if ( ( rc = register_settings ( &smbios_settings, NULL ) ) != 0 ) {
DBG ( "SMBIOS could not register settings: %s\n",
strerror ( rc ) );
return;
}
}
/** SMBIOS settings initialiser */
struct init_fn smbios_init_fn __init_fn ( INIT_NORMAL ) = {
.initialise = smbios_init,
};
/** UUID setting obtained via SMBIOS */
struct setting uuid_setting __setting = {
.name = "uuid",
.description = "UUID",
.tag = SMBIOS_RAW_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
struct smbios_system_information, uuid ),
.type = &setting_type_uuid,
};
/** Other SMBIOS named settings */
struct setting smbios_named_settings[] __setting = {
{
.name = "manufacturer",
.description = "Manufacturer",
.tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
struct smbios_system_information,
manufacturer ),
.type = &setting_type_string,
},
{
.name = "product",
.description = "Product name",
.tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
struct smbios_system_information,
product ),
.type = &setting_type_string,
},
{
.name = "serial",
.description = "Serial number",
.tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
struct smbios_system_information,
serial ),
.type = &setting_type_string,
},
{
.name = "asset",
.description = "Asset tag",
.tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_ENCLOSURE_INFORMATION,
struct smbios_enclosure_information,
asset_tag ),
.type = &setting_type_string,
},
};
