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-rw-r--r--kexec/crashdump.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/kexec/crashdump.c b/kexec/crashdump.c
new file mode 100644
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--- /dev/null
+++ b/kexec/crashdump.c
@@ -0,0 +1,65 @@
+/*
+ * crashdump.c: Architecture independent code for crashdump support.
+ *
+ * Created by: Vivek Goyal (vgoyal@in.ibm.com)
+ * Copyright (C) IBM Corporation, 2005. All rights reserved
+ *
+ * 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).
+ *
+ * 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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <elf.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "kexec.h"
+#include "crashdump.h"
+
+/* Returns the physical address of start of crash notes buffer for a cpu. */
+int get_crash_notes_per_cpu(int cpu, uint64_t *addr)
+{
+ char crash_notes[PATH_MAX];
+ char line[MAX_LINE];
+ FILE *fp;
+ struct stat cpu_stat;
+ int count;
+ unsigned long long temp;
+
+ sprintf(crash_notes, "/sys/devices/system/cpu/cpu%d/crash_notes", cpu);
+ fp = fopen(crash_notes, "r");
+ if (!fp) {
+ /* Either sysfs is not mounted or CPU is not present*/
+ if (stat("/sys/devices", &cpu_stat))
+ die("Sysfs is not mounted. Try mounting sysfs\n");
+
+ /* CPU is not physically present.*/
+ *addr = 0;
+ return errno;
+ }
+ if (fgets(line, sizeof(line), fp) != 0) {
+ count = sscanf(line, "%Lx", &temp);
+ if (count != 1)
+ die("Cannot parse %s: %s\n", crash_notes,
+ strerror(errno));
+ *addr = (uint64_t) temp;
+ }
+#if 0
+ printf("crash_notes addr = %Lx\n", *addr);
+#endif
+ return 0;
+}