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Annotation of qemu/roms/ipxe/src/interface/smbios/smbios_settings.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2008 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <stdint.h>
        !            22: #include <string.h>
        !            23: #include <errno.h>
        !            24: #include <ipxe/settings.h>
        !            25: #include <ipxe/init.h>
        !            26: #include <ipxe/uuid.h>
        !            27: #include <ipxe/smbios.h>
        !            28: 
        !            29: /** SMBIOS settings tag magic number */
        !            30: #define SMBIOS_TAG_MAGIC 0x5B /* "SmBios" */
        !            31: 
        !            32: /**
        !            33:  * Construct SMBIOS empty tag
        !            34:  *
        !            35:  * @ret tag            SMBIOS setting tag
        !            36:  */
        !            37: #define SMBIOS_EMPTY_TAG ( SMBIOS_TAG_MAGIC << 24 )
        !            38: 
        !            39: /**
        !            40:  * Construct SMBIOS raw-data tag
        !            41:  *
        !            42:  * @v _type            SMBIOS structure type number
        !            43:  * @v _structure       SMBIOS structure data type
        !            44:  * @v _field           Field within SMBIOS structure data type
        !            45:  * @ret tag            SMBIOS setting tag
        !            46:  */
        !            47: #define SMBIOS_RAW_TAG( _type, _structure, _field )            \
        !            48:        ( ( SMBIOS_TAG_MAGIC << 24 ) |                          \
        !            49:          ( (_type) << 16 ) |                                   \
        !            50:          ( offsetof ( _structure, _field ) << 8 ) |            \
        !            51:          ( sizeof ( ( ( _structure * ) 0 )->_field ) ) )
        !            52: 
        !            53: /**
        !            54:  * Construct SMBIOS string tag
        !            55:  *
        !            56:  * @v _type            SMBIOS structure type number
        !            57:  * @v _structure       SMBIOS structure data type
        !            58:  * @v _field           Field within SMBIOS structure data type
        !            59:  * @ret tag            SMBIOS setting tag
        !            60:  */
        !            61: #define SMBIOS_STRING_TAG( _type, _structure, _field )         \
        !            62:        ( ( SMBIOS_TAG_MAGIC << 24 ) |                          \
        !            63:          ( (_type) << 16 ) |                                   \
        !            64:          ( offsetof ( _structure, _field ) << 8 ) )
        !            65: 
        !            66: /**
        !            67:  * Check applicability of SMBIOS setting
        !            68:  *
        !            69:  * @v settings         Settings block
        !            70:  * @v setting          Setting
        !            71:  * @ret applies                Setting applies within this settings block
        !            72:  */
        !            73: static int smbios_applies ( struct settings *settings __unused,
        !            74:                            struct setting *setting ) {
        !            75:        unsigned int tag_magic;
        !            76: 
        !            77:        /* Check tag magic */
        !            78:        tag_magic = ( setting->tag >> 24 );
        !            79:        return ( tag_magic == SMBIOS_TAG_MAGIC );
        !            80: }
        !            81: 
        !            82: /**
        !            83:  * Fetch value of SMBIOS setting
        !            84:  *
        !            85:  * @v settings         Settings block, or NULL to search all blocks
        !            86:  * @v setting          Setting to fetch
        !            87:  * @v data             Buffer to fill with setting data
        !            88:  * @v len              Length of buffer
        !            89:  * @ret len            Length of setting data, or negative error
        !            90:  */
        !            91: static int smbios_fetch ( struct settings *settings __unused,
        !            92:                          struct setting *setting,
        !            93:                          void *data, size_t len ) {
        !            94:        struct smbios_structure structure;
        !            95:        unsigned int tag_magic;
        !            96:        unsigned int tag_type;
        !            97:        unsigned int tag_offset;
        !            98:        unsigned int tag_len;
        !            99:        int rc;
        !           100: 
        !           101:        /* Split tag into type, offset and length */
        !           102:        tag_magic = ( setting->tag >> 24 );
        !           103:        tag_type = ( ( setting->tag >> 16 ) & 0xff );
        !           104:        tag_offset = ( ( setting->tag >> 8 ) & 0xff );
        !           105:        tag_len = ( setting->tag & 0xff );
        !           106:        assert ( tag_magic == SMBIOS_TAG_MAGIC );
        !           107: 
        !           108:        /* Find SMBIOS structure */
        !           109:        if ( ( rc = find_smbios_structure ( tag_type, &structure ) ) != 0 )
        !           110:                return rc;
        !           111: 
        !           112:        {
        !           113:                uint8_t buf[structure.header.len];
        !           114: 
        !           115:                /* Read SMBIOS structure */
        !           116:                if ( ( rc = read_smbios_structure ( &structure, buf,
        !           117:                                                    sizeof ( buf ) ) ) != 0 )
        !           118:                        return rc;
        !           119: 
        !           120:                if ( tag_len == 0 ) {
        !           121:                        /* String */
        !           122:                        return read_smbios_string ( &structure,
        !           123:                                                    buf[tag_offset],
        !           124:                                                    data, len );
        !           125:                } else {
        !           126:                        /* Raw data */
        !           127:                        if ( len > tag_len )
        !           128:                                len = tag_len;
        !           129:                        memcpy ( data, &buf[tag_offset], len );
        !           130:                        return tag_len;
        !           131:                }
        !           132:        }
        !           133: }
        !           134: 
        !           135: /** SMBIOS settings operations */
        !           136: static struct settings_operations smbios_settings_operations = {
        !           137:        .applies = smbios_applies,
        !           138:        .fetch = smbios_fetch,
        !           139: };
        !           140: 
        !           141: /** SMBIOS settings */
        !           142: static struct settings smbios_settings = {
        !           143:        .refcnt = NULL,
        !           144:        .tag_magic = SMBIOS_EMPTY_TAG,
        !           145:        .siblings = LIST_HEAD_INIT ( smbios_settings.siblings ),
        !           146:        .children = LIST_HEAD_INIT ( smbios_settings.children ),
        !           147:        .op = &smbios_settings_operations,
        !           148: };
        !           149: 
        !           150: /** Initialise SMBIOS settings */
        !           151: static void smbios_init ( void ) {
        !           152:        int rc;
        !           153: 
        !           154:        if ( ( rc = register_settings ( &smbios_settings, NULL,
        !           155:                                        "smbios" ) ) != 0 ) {
        !           156:                DBG ( "SMBIOS could not register settings: %s\n",
        !           157:                      strerror ( rc ) );
        !           158:                return;
        !           159:        }
        !           160: }
        !           161: 
        !           162: /** SMBIOS settings initialiser */
        !           163: struct init_fn smbios_init_fn __init_fn ( INIT_NORMAL ) = {
        !           164:        .initialise = smbios_init,
        !           165: };
        !           166: 
        !           167: /** UUID setting obtained via SMBIOS */
        !           168: struct setting uuid_setting __setting ( SETTING_HOST ) = {
        !           169:        .name = "uuid",
        !           170:        .description = "UUID",
        !           171:        .tag = SMBIOS_RAW_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
        !           172:                                struct smbios_system_information, uuid ),
        !           173:        .type = &setting_type_uuid,
        !           174: };
        !           175: 
        !           176: /** Other SMBIOS named settings */
        !           177: struct setting smbios_named_settings[] __setting ( SETTING_HOST_EXTRA ) = {
        !           178:        {
        !           179:                .name = "manufacturer",
        !           180:                .description = "Manufacturer",
        !           181:                .tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
        !           182:                                           struct smbios_system_information,
        !           183:                                           manufacturer ),
        !           184:                .type = &setting_type_string,
        !           185:        },
        !           186:        {
        !           187:                .name = "product",
        !           188:                .description = "Product name",
        !           189:                .tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
        !           190:                                           struct smbios_system_information,
        !           191:                                           product ),
        !           192:                .type = &setting_type_string,
        !           193:        },
        !           194:        {
        !           195:                .name = "serial",
        !           196:                .description = "Serial number",
        !           197:                .tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_SYSTEM_INFORMATION,
        !           198:                                           struct smbios_system_information,
        !           199:                                           serial ),
        !           200:                .type = &setting_type_string,
        !           201:        },
        !           202:        {
        !           203:                .name = "asset",
        !           204:                .description = "Asset tag",
        !           205:                .tag = SMBIOS_STRING_TAG ( SMBIOS_TYPE_ENCLOSURE_INFORMATION,
        !           206:                                           struct smbios_enclosure_information,
        !           207:                                           asset_tag ),
        !           208:                .type = &setting_type_string,
        !           209:        },
        !           210: };

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