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authorMohan Kumar M <mohan@in.ibm.com>2006-10-09 14:56:13 +0530
committerSimon Horman <horms@verge.net.au>2006-10-13 16:04:17 +0900
commitfcd1df8df66762b741a99319434405817e4c31ec (patch)
tree0f6d5eefbf094b321feac4eca6ca002d958291b9
parent7ba1a8074fa4010494a779f05f360f02058d76bc (diff)
Check for crashkernel reservation in i386
Check whether memory for crashkernel is reserved or not by looking for the entry "Crash kernel" in /proc/iomem. Signed-off-by: Mohan Kumar M <mohan@in.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
-rw-r--r--kexec/arch/i386/crashdump-x86.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/kexec/arch/i386/crashdump-x86.c b/kexec/arch/i386/crashdump-x86.c
index b286527..59dd3cd 100644
--- a/kexec/arch/i386/crashdump-x86.c
+++ b/kexec/arch/i386/crashdump-x86.c
@@ -722,3 +722,33 @@ int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline,
cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
return 0;
}
+
+int is_crashkernel_mem_reserved(void)
+{
+ const char iomem[]= "/proc/iomem";
+ char line[MAX_LINE];
+ FILE *fp;
+ unsigned long long start, end;
+ char *str;
+ int consumed;
+ int count;
+
+ fp = fopen(iomem, "r");
+ if (!fp)
+ die("Cannot open /proc/iomem");
+
+ while(fgets(line, sizeof(line), fp) != 0) {
+ count = sscanf(line, "%Lx-%Lx : %n", &start, &end, &consumed);
+ if (count != 2)
+ continue;
+ str = line + consumed;
+ if (memcmp(str, "Crash kernel\n", 13) == 0)
+ break;
+ }
+
+ fclose(fp);
+ if (!memcmp(str, "Crash kernel\n", 13) == 0 || (start == end))
+ return 0;
+ else
+ return 1;
+}