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-rw-r--r--gpxe/src/arch/i386/firmware/pcbios/smbios_settings.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/firmware/pcbios/smbios_settings.c b/gpxe/src/arch/i386/firmware/pcbios/smbios_settings.c
new file mode 100644
index 00000000..de08ec5b
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+++ b/gpxe/src/arch/i386/firmware/pcbios/smbios_settings.c
@@ -0,0 +1,158 @@
+/*
+ * 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.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <gpxe/settings.h>
+#include <gpxe/init.h>
+#include <gpxe/uuid.h>
+#include <smbios.h>
+
+/**
+ * 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 ) \
+ ( ( (_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 ) \
+ ( ( (_type) << 16 ) | \
+ ( offsetof ( _structure, _field ) << 8 ) )
+
+/**
+ * Store value of SMBIOS setting
+ *
+ * @v settings Settings block
+ * @v setting Setting to store
+ * @v data Setting data, or NULL to clear setting
+ * @v len Length of setting data
+ * @ret rc Return status code
+ */
+static int smbios_store ( struct settings *settings __unused,
+ struct setting *setting __unused,
+ const void *data __unused, size_t len __unused ) {
+ /* Cannot write data into SMBIOS */
+ return -ENOTSUP;
+}
+
+/**
+ * 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_type;
+ unsigned int tag_offset;
+ unsigned int tag_len;
+ int rc;
+
+ /* Split tag into type, offset and length */
+ tag_type = ( setting->tag >> 16 );
+ tag_offset = ( ( setting->tag >> 8 ) & 0xff );
+ tag_len = ( setting->tag & 0xff );
+ if ( ! tag_type )
+ 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 = {
+ .store = smbios_store,
+ .fetch = smbios_fetch,
+};
+
+/** SMBIOS settings */
+static struct settings smbios_settings = {
+ .refcnt = NULL,
+ .name = "smbios",
+ .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,
+};