1 files changed, 83 insertions, 0 deletions
diff --git a/kexec/arch/x86_64/arch_init.c b/kexec/arch/x86_64/arch_init.c
new file mode 100644
index 0000000..79fb642
--- /dev/null
+++ b/kexec/arch/x86_64/arch_init.c
@@ -0,0 +1,83 @@
+#include <errno.h>
+#include <string.h>
+#include <sys/utsname.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include "crashdump-x86_64.h"
+
+#define KERNEL_VERSION(major, minor, patch) \
+	(((major) << 16) | ((minor) << 8) | patch)
+
+long kernel_version(void)
+{
+	struct utsname utsname;
+	unsigned long major, minor, patch;
+	char *p;
+
+	if (uname(&utsname) < 0) {
+		fprintf(stderr, "uname failed: %s\n", strerror(errno));
+		return -1;
+	}
+
+	p = utsname.release;
+	major = strtoul(p, &p, 10);
+	if (major == ULONG_MAX) {
+		fprintf(stderr, "strtoul failed: %s\n", strerror(errno));
+		return -1;
+	}
+
+	if (*p++ != '.') {
+		fprintf(stderr, "Unsupported utsname.release: %s\n",
+			utsname.release);
+		return -1;
+	}
+
+	minor = strtoul(p, &p, 10);
+	if (major == ULONG_MAX) {
+		fprintf(stderr, "strtoul failed: %s\n", strerror(errno));
+		return -1;
+	}
+
+	if (*p++ != '.') {
+		fprintf(stderr, "Unsupported utsname.release: %s\n",
+			utsname.release);
+		return -1;
+	}
+
+	patch = strtoul(p, &p, 10);
+	if (major == ULONG_MAX) {
+		fprintf(stderr, "strtoul failed: %s\n", strerror(errno));
+		return -1;
+	}
+
+	if (major >= 256 || minor >= 256 || patch >= 256) {
+		fprintf(stderr, "Unsupported utsname.release: %s\n",
+			utsname.release);
+		return -1;
+	}
+
+	return KERNEL_VERSION(major, minor, patch);
+}
+
+#define PAGE_OFFSET_PRE_2_6_27	0xffff810000000000UL
+#define PAGE_OFFSET		0xffff880000000000UL
+
+unsigned long page_offset;
+
+int arch_init(void)
+{
+	int kv;
+
+	kv = kernel_version();
+	if (kv < 0)
+		return -1;
+
+	if (kv < KERNEL_VERSION(2, 6, 27))
+		page_offset = PAGE_OFFSET_PRE_2_6_27;
+	else
+		page_offset = PAGE_OFFSET;
+
+	return 0;
+}