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/*
* 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;
}
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