feade5da6e
In particular, expose the system UUID as a setting ("smbios/uuid").
159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*
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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <gpxe/settings.h>
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#include <gpxe/init.h>
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#include <gpxe/uuid.h>
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#include <smbios.h>
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/**
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* Construct SMBIOS raw-data tag
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*
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* @v _type SMBIOS structure type number
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* @v _structure SMBIOS structure data type
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* @v _field Field within SMBIOS structure data type
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* @ret tag SMBIOS setting tag
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*/
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#define SMBIOS_RAW_TAG( _type, _structure, _field ) \
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( ( (_type) << 16 ) | \
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( offsetof ( _structure, _field ) << 8 ) | \
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( sizeof ( ( ( _structure * ) 0 )->_field ) ) )
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/**
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* Construct SMBIOS string tag
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*
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* @v _type SMBIOS structure type number
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* @v _structure SMBIOS structure data type
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* @v _field Field within SMBIOS structure data type
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* @ret tag SMBIOS setting tag
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*/
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#define SMBIOS_STRING_TAG( _type, _structure, _field ) \
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( ( (_type) << 16 ) | \
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( offsetof ( _structure, _field ) << 8 ) )
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/**
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* Store value of SMBIOS setting
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*
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* @v settings Settings block
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* @v setting Setting to store
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* @v data Setting data, or NULL to clear setting
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* @v len Length of setting data
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* @ret rc Return status code
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*/
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static int smbios_store ( struct settings *settings __unused,
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struct setting *setting __unused,
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const void *data __unused, size_t len __unused ) {
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/* Cannot write data into SMBIOS */
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return -ENOTSUP;
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}
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/**
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* Fetch value of SMBIOS setting
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*
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* @v settings Settings block, or NULL to search all blocks
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* @v setting Setting to fetch
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* @v data Buffer to fill with setting data
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* @v len Length of buffer
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* @ret len Length of setting data, or negative error
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*/
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static int smbios_fetch ( struct settings *settings __unused,
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struct setting *setting,
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void *data, size_t len ) {
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struct smbios_structure structure;
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unsigned int tag_type;
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unsigned int tag_offset;
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unsigned int tag_len;
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int rc;
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/* Split tag into type, offset and length */
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tag_type = ( setting->tag >> 16 );
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tag_offset = ( ( setting->tag >> 8 ) & 0xff );
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tag_len = ( setting->tag & 0xff );
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if ( ! tag_type )
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return -ENOENT;
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/* Find SMBIOS structure */
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if ( ( rc = find_smbios_structure ( tag_type, &structure ) ) != 0 )
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return rc;
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{
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uint8_t buf[structure.header.len];
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/* Read SMBIOS structure */
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if ( ( rc = read_smbios_structure ( &structure, buf,
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sizeof ( buf ) ) ) != 0 )
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return rc;
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if ( tag_len == 0 ) {
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/* String */
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return read_smbios_string ( &structure,
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buf[tag_offset],
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data, len );
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} else {
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/* Raw data */
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if ( len > tag_len )
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len = tag_len;
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memcpy ( data, &buf[tag_offset], len );
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return tag_len;
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}
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}
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}
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/** SMBIOS settings operations */
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static struct settings_operations smbios_settings_operations = {
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.store = smbios_store,
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.fetch = smbios_fetch,
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};
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/** SMBIOS settings */
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static struct settings smbios_settings = {
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.refcnt = NULL,
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.name = "smbios",
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.siblings = LIST_HEAD_INIT ( smbios_settings.siblings ),
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.children = LIST_HEAD_INIT ( smbios_settings.children ),
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.op = &smbios_settings_operations,
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};
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/** Initialise SMBIOS settings */
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static void smbios_init ( void ) {
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int rc;
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if ( ( rc = register_settings ( &smbios_settings, NULL ) ) != 0 ) {
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DBG ( "SMBIOS could not register settings: %s\n",
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strerror ( rc ) );
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return;
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}
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}
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/** SMBIOS settings initialiser */
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struct init_fn smbios_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = smbios_init,
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};
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/** UUID setting obtained via SMBIOS */
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struct setting uuid_setting __setting = {
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.name = "uuid",
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.description = "UUID",
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.tag = SMBIOS_RAW_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
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struct smbios_system_information, uuid ),
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.type = &setting_type_uuid,
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};
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