Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef LINUX_KEXEC_H
2#define LINUX_KEXEC_H
3
4#ifdef CONFIG_KEXEC
5#include <linux/types.h>
6#include <linux/list.h>
7#include <linux/linkage.h>
8#include <linux/compat.h>
9#include <asm/kexec.h>
10
11/* Verify architecture specific macros are defined */
12
13#ifndef KEXEC_SOURCE_MEMORY_LIMIT
14#error KEXEC_SOURCE_MEMORY_LIMIT not defined
15#endif
16
17#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
18#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
19#endif
20
21#ifndef KEXEC_CONTROL_MEMORY_LIMIT
22#error KEXEC_CONTROL_MEMORY_LIMIT not defined
23#endif
24
25#ifndef KEXEC_CONTROL_CODE_SIZE
26#error KEXEC_CONTROL_CODE_SIZE not defined
27#endif
28
29#ifndef KEXEC_ARCH
30#error KEXEC_ARCH not defined
31#endif
32
33/*
34 * This structure is used to hold the arguments that are used when loading
35 * kernel binaries.
36 */
37
38typedef unsigned long kimage_entry_t;
39#define IND_DESTINATION 0x1
40#define IND_INDIRECTION 0x2
41#define IND_DONE 0x4
42#define IND_SOURCE 0x8
43
44#define KEXEC_SEGMENT_MAX 8
45struct kexec_segment {
46 void __user *buf;
47 size_t bufsz;
48 unsigned long mem; /* User space sees this as a (void *) ... */
49 size_t memsz;
50};
51
52#ifdef CONFIG_COMPAT
53struct compat_kexec_segment {
54 compat_uptr_t buf;
55 compat_size_t bufsz;
56 compat_ulong_t mem; /* User space sees this as a (void *) ... */
57 compat_size_t memsz;
58};
59#endif
60
61struct kimage {
62 kimage_entry_t head;
63 kimage_entry_t *entry;
64 kimage_entry_t *last_entry;
65
66 unsigned long destination;
67
68 unsigned long start;
69 struct page *control_code_page;
70
71 unsigned long nr_segments;
72 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
73
74 struct list_head control_pages;
75 struct list_head dest_pages;
76 struct list_head unuseable_pages;
77
78 /* Address of next control page to allocate for crash kernels. */
79 unsigned long control_page;
80
81 /* Flags to indicate special processing */
82 unsigned int type : 1;
83#define KEXEC_TYPE_DEFAULT 0
84#define KEXEC_TYPE_CRASH 1
85};
86
87
88
89/* kexec interface functions */
90extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
91extern int machine_kexec_prepare(struct kimage *image);
92extern void machine_kexec_cleanup(struct kimage *image);
93extern asmlinkage long sys_kexec_load(unsigned long entry,
94 unsigned long nr_segments,
95 struct kexec_segment __user *segments,
96 unsigned long flags);
97#ifdef CONFIG_COMPAT
98extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
99 unsigned long nr_segments,
100 struct compat_kexec_segment __user *segments,
101 unsigned long flags);
102#endif
103extern struct page *kimage_alloc_control_pages(struct kimage *image,
104 unsigned int order);
105extern void crash_kexec(struct pt_regs *);
106int kexec_should_crash(struct task_struct *);
107extern struct kimage *kexec_image;
108
109#define KEXEC_ON_CRASH 0x00000001
110#define KEXEC_ARCH_MASK 0xffff0000
111
112/* These values match the ELF architecture values.
113 * Unless there is a good reason that should continue to be the case.
114 */
115#define KEXEC_ARCH_DEFAULT ( 0 << 16)
116#define KEXEC_ARCH_386 ( 3 << 16)
117#define KEXEC_ARCH_X86_64 (62 << 16)
118#define KEXEC_ARCH_PPC (20 << 16)
119#define KEXEC_ARCH_PPC64 (21 << 16)
120#define KEXEC_ARCH_IA_64 (50 << 16)
121#define KEXEC_ARCH_S390 (22 << 16)
122
123#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
124
125/* Location of a reserved region to hold the crash kernel.
126 */
127extern struct resource crashk_res;
128
129#else /* !CONFIG_KEXEC */
130struct pt_regs;
131struct task_struct;
132static inline void crash_kexec(struct pt_regs *regs) { }
133static inline int kexec_should_crash(struct task_struct *p) { return 0; }
134#endif /* CONFIG_KEXEC */
135#endif /* LINUX_KEXEC_H */