diff options
Diffstat (limited to 'kexec/crashdump.c')
-rw-r--r-- | kexec/crashdump.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/kexec/crashdump.c b/kexec/crashdump.c new file mode 100644 index 0000000..9e5bf15 --- /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; +} |