/* SPDX-License-Identifier: GPL-2.0 */
/*
 * OS info memory interface
 *
 * Copyright IBM Corp. 2012
 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
 */
#ifndef _ASM_S390_OS_INFO_H
#define _ASM_S390_OS_INFO_H

#include <linux/uio.h>

#define OS_INFO_VERSION_MAJOR   1
#define OS_INFO_VERSION_MINOR   1
#define OS_INFO_MAGIC           0x4f53494e464f535aULL /* OSINFOSZ */

#define OS_INFO_VMCOREINFO      0
#define OS_INFO_REIPL_BLOCK     1
#define OS_INFO_FLAGS_ENTRY     2
#define OS_INFO_RESERVED        3
#define OS_INFO_IDENTITY_BASE   4
#define OS_INFO_KASLR_OFFSET    5
#define OS_INFO_KASLR_OFF_PHYS  6
#define OS_INFO_VMEMMAP         7
#define OS_INFO_AMODE31_START   8
#define OS_INFO_AMODE31_END     9
#define OS_INFO_IMAGE_START     10
#define OS_INFO_IMAGE_END       11
#define OS_INFO_IMAGE_PHYS      12
#define OS_INFO_MAX             13

#define OS_INFO_FLAG_REIPL_CLEAR        (1UL << 0)

struct os_info_entry {
        union {
                u64     addr;
                u64     val;
        };
        u64     size;
        u32     csum;
} __packed;

struct os_info {
        u64     magic;
        u32     csum;
        u16     version_major;
        u16     version_minor;
        u64     crashkernel_addr;
        u64     crashkernel_size;
        struct os_info_entry entry[OS_INFO_MAX];
        u8      reserved[3804];
} __packed;

void os_info_init(void);
void os_info_entry_add_data(int nr, void *ptr, u64 len);
void os_info_entry_add_val(int nr, u64 val);
void os_info_crashkernel_add(unsigned long base, unsigned long size);
u32 os_info_csum(struct os_info *os_info);

#ifdef CONFIG_CRASH_DUMP
void *os_info_old_entry(int nr, unsigned long *size);
static inline unsigned long os_info_old_value(int nr)
{
        unsigned long size;

        return (unsigned long)os_info_old_entry(nr, &size);
}
#else
static inline void *os_info_old_entry(int nr, unsigned long *size)
{
        return NULL;
}
#endif

#endif /* _ASM_S390_OS_INFO_H */