1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * OS info memory interface
4 *
5 * Copyright IBM Corp. 2012
6 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
7 */
8 #ifndef _ASM_S390_OS_INFO_H
9 #define _ASM_S390_OS_INFO_H
10
11 #include <linux/uio.h>
12
13 #define OS_INFO_VERSION_MAJOR 1
14 #define OS_INFO_VERSION_MINOR 1
15 #define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
16
17 #define OS_INFO_VMCOREINFO 0
18 #define OS_INFO_REIPL_BLOCK 1
19 #define OS_INFO_FLAGS_ENTRY 2
20 #define OS_INFO_RESERVED 3
21 #define OS_INFO_IDENTITY_BASE 4
22 #define OS_INFO_KASLR_OFFSET 5
23 #define OS_INFO_KASLR_OFF_PHYS 6
24 #define OS_INFO_VMEMMAP 7
25 #define OS_INFO_AMODE31_START 8
26 #define OS_INFO_AMODE31_END 9
27 #define OS_INFO_IMAGE_START 10
28 #define OS_INFO_IMAGE_END 11
29 #define OS_INFO_IMAGE_PHYS 12
30 #define OS_INFO_MAX 13
31
32 #define OS_INFO_FLAG_REIPL_CLEAR (1UL << 0)
33
34 struct os_info_entry {
35 union {
36 u64 addr;
37 u64 val;
38 };
39 u64 size;
40 u32 csum;
41 } __packed;
42
43 struct os_info {
44 u64 magic;
45 u32 csum;
46 u16 version_major;
47 u16 version_minor;
48 u64 crashkernel_addr;
49 u64 crashkernel_size;
50 struct os_info_entry entry[OS_INFO_MAX];
51 u8 reserved[3804];
52 } __packed;
53
54 void os_info_init(void);
55 void os_info_entry_add_data(int nr, void *ptr, u64 len);
56 void os_info_entry_add_val(int nr, u64 val);
57 void os_info_crashkernel_add(unsigned long base, unsigned long size);
58 u32 os_info_csum(struct os_info *os_info);
59
60 #ifdef CONFIG_CRASH_DUMP
61 void *os_info_old_entry(int nr, unsigned long *size);
62 static inline unsigned long os_info_old_value(int nr)
63 {
64 unsigned long size;
65
66 return (unsigned long)os_info_old_entry(nr, &size);
67 }
68 #else
69 static inline void *os_info_old_entry(int nr, unsigned long *size)
70 {
71 return NULL;
72 }
73 #endif
74
75 #endif /* _ASM_S390_OS_INFO_H */
76
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