Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / crash_dump.c

diff --git a/kernel/kernel/crash_dump.c b/kernel/kernel/crash_dump.c
new file mode 100644 (file)
index 0000000..b64e238
--- /dev/null
+++ b/kernel/kernel/crash_dump.c
@@ -0,0 +1,46 @@
+#include <linux/kernel.h>
+#include <linux/crash_dump.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+
+/*
+ * If we have booted due to a crash, max_pfn will be a very low value. We need
+ * to know the amount of memory that the previous kernel used.
+ */
+unsigned long saved_max_pfn;
+
+/*
+ * stores the physical address of elf header of crash image
+ *
+ * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
+ * is_kdump_kernel() to determine if we are booting after a panic. Hence put
+ * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
+ */
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+EXPORT_SYMBOL_GPL(elfcorehdr_addr);
+
+/*
+ * stores the size of elf header of crash image
+ */
+unsigned long long elfcorehdr_size;
+
+/*
+ * elfcorehdr= specifies the location of elf core header stored by the crashed
+ * kernel. This option will be passed by kexec loader to the capture kernel.
+ *
+ * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
+ */
+static int __init setup_elfcorehdr(char *arg)
+{
+       char *end;
+       if (!arg)
+               return -EINVAL;
+       elfcorehdr_addr = memparse(arg, &end);
+       if (*end == '@') {
+               elfcorehdr_size = elfcorehdr_addr;
+               elfcorehdr_addr = memparse(end + 1, &end);
+       }
+       return end > arg ? 0 : -EINVAL;
+}
+early_param("elfcorehdr", setup_elfcorehdr);