summaryrefslogtreecommitdiff
path: root/extras/edd_id/edd_id.c
diff options
context:
space:
mode:
authorKay Sievers <kay.sievers@suse.de>2005-09-06 12:18:04 +0200
committerKay Sievers <kay.sievers@suse.de>2005-09-06 12:18:04 +0200
commit077ed27c55a9ea661262d7b3ec8be184445ab82e (patch)
tree345dd6d07cc1585661d69013784ef3995c949a6d /extras/edd_id/edd_id.c
parent7596a562988b45b62dcac6daac3663524cc8f930 (diff)
add edd_id tool to match BIOS EDD disk information
Thanks to: John Hull <John_Hull@Dell.com> Matt Domsch <Matt_Domsch@Dell.com> Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Diffstat (limited to 'extras/edd_id/edd_id.c')
-rw-r--r--extras/edd_id/edd_id.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/extras/edd_id/edd_id.c b/extras/edd_id/edd_id.c
new file mode 100644
index 0000000000..504aac36e6
--- /dev/null
+++ b/extras/edd_id/edd_id.c
@@ -0,0 +1,184 @@
+/*
+ * edd_id - naming of BIOS disk devices via EDD
+ *
+ * Copyright (C) 2005 John Hull <John_Hull@Dell.com>
+ * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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 version 2 of the License.
+ *
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <errno.h>
+#include <dirent.h>
+#include <stdint.h>
+
+#include "../../logging.h"
+#include "../../udev_utils.h"
+
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
+{
+ va_list args;
+ static int udev_log = -1;
+
+ if (udev_log == -1) {
+ const char *value;
+
+ value = getenv("UDEV_LOG");
+ if (value)
+ udev_log = log_priority(value);
+ else
+ udev_log = LOG_ERR;
+ }
+
+ if (priority > udev_log)
+ return;
+
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
+}
+#endif
+
+int main(int argc, char *argv[])
+{
+ const char *node = NULL;
+ int i;
+ int export = 0;
+ uint32_t disk_id;
+ uint16_t mbr_valid;
+ struct dirent *dent;
+ int disk_fd;
+ int sysfs_fd;
+ DIR *dir = NULL;
+ int rc = 1;
+
+ logging_init("edd_id");
+
+ for (i = 1 ; i < argc; i++) {
+ char *arg = argv[i];
+
+ if (strcmp(arg, "--export") == 0) {
+ export = 1;
+ } else
+ node = arg;
+ }
+ if (!node) {
+ err("no node specified");
+ fprintf(stderr, "no node specified\n");
+ goto exit;
+ }
+
+ /* check for kernel support */
+ dir = opendir("/sys/firmware/edd");
+ if (!dir) {
+ info("no kernel EDD support");
+ fprintf(stderr, "no kernel EDD support\n");
+ rc = 2;
+ goto exit;
+ }
+
+ disk_fd = open(node, O_RDONLY);
+ if (disk_fd < 0) {
+ info("unable to open '%s'", node);
+ fprintf(stderr, "unable to open '%s'\n", node);
+ rc = 3;
+ goto closedir;
+ }
+
+ /* check for valid MBR signature */
+ if (lseek(disk_fd, 510, SEEK_SET) < 0) {
+ info("seek to MBR validity failed '%s'", node);
+ rc = 4;
+ goto close;
+ }
+ if (read(disk_fd, &mbr_valid, sizeof(mbr_valid)) != sizeof(mbr_valid)) {
+ info("read MBR validity failed '%s'", node);
+ rc = 5;
+ goto close;
+ }
+ if (mbr_valid != 0xAA55) {
+ fprintf(stderr, "no valid MBR signature '%s'\n", node);
+ info("no valid MBR signature '%s'", node);
+ rc=6;
+ goto close;
+ }
+
+ /* read EDD signature */
+ if (lseek(disk_fd, 440, SEEK_SET) < 0) {
+ info("seek to signature failed '%s'", node);
+ rc = 7;
+ goto close;
+ }
+ if (read(disk_fd, &disk_id, sizeof(disk_id)) != sizeof(disk_id)) {
+ info("read signature failed '%s'", node);
+ rc = 8;
+ goto close;
+ }
+ /* all zero is invalid */
+ info("read id 0x%08x from '%s'", disk_id, node);
+ if (disk_id == 0) {
+ fprintf(stderr, "no EDD signature '%s'\n", node);
+ info("'%s' signature is zero", node);
+ rc = 9;
+ goto close;
+ }
+
+ /* lookup signature in sysfs to determine the name */
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char file[PATH_SIZE];
+ char sysfs_id_buf[256];
+ uint32_t sysfs_id;
+ ssize_t size;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ snprintf(file, sizeof(file), "/sys/firmware/edd/%s/mbr_signature", dent->d_name);
+ file[sizeof(file)-1] = '\0';
+
+ sysfs_fd = open(file, O_RDONLY);
+ if (sysfs_fd < 0) {
+ info("unable to open sysfs '%s'", file);
+ continue;
+ }
+
+ size = read(sysfs_fd, sysfs_id_buf, sizeof(sysfs_id_buf)-1);
+ close(sysfs_fd);
+ if (size < 0) {
+ info("read sysfs '%s' failed", file);
+ continue;
+ }
+ sysfs_id_buf[size] = '\0';
+ info("read '%s' from '%s'", sysfs_id_buf, file);
+
+ sysfs_id = strtoul(sysfs_id_buf, NULL, 16);
+ if (disk_id == sysfs_id) {
+ if (export)
+ printf("ID_EDD=%s\n", dent->d_name);
+ else
+ printf("%s\n", dent->d_name);
+ rc = 0;
+ break;
+ }
+ }
+
+close:
+ close(disk_fd);
+closedir:
+ closedir(dir);
+exit:
+ logging_close();
+ return rc;
+}