zipl/boot: Move struct os_info to the separate header

- Move struct os_info from kdump.h to the new header os_info.h.
- Place os_info.h to include/boot in order to use it in zgetdump
  code as well.
- Replace hardcoded value of OS_INFO_CSUM_SIZE with a properly
  calculated one.
- Rename os_info_check() of kdump.h to kdump_os_info_check().

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

include/boot/os_info.h

@@ -0,0 +1,41 @@
+/*
+ * zipl - zSeries Initial Program Loader tool
+ *
+ * os-info definitions
+ *
+ * Copyright IBM Corp. 2013, 2023
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#ifndef OS_INFO_H
+#define OS_INFO_H
+
+#include "lib/zt_common.h"
+#include <stdint.h>
+
+#define OS_INFO_MAGIC			0x4f53494e464f535aULL /* OSINFOSZ */
+#define OS_INFO_CSUM_SIZE		(sizeof(struct os_info) - offsetof(struct os_info, version_major))
+
+#define OS_INFO_VMCOREINFO		0
+#define OS_INFO_REIPL_BLOCK		1
+
+struct os_info_entry {
+	uint64_t addr;
+	uint64_t size;
+	uint32_t csum;
+} __packed;
+
+struct os_info {
+	uint64_t magic;
+	uint32_t csum;
+	uint16_t version_major;
+	uint16_t version_minor;
+	uint64_t crashkernel_addr;
+	uint64_t crashkernel_size;
+	struct os_info_entry entry[2];
+	uint8_t reserved[4024];
+} __packed;
+
+#endif /* OS_INFO_H */