Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 <linux/ioport.h>
10#include <linux/elfcore.h>
11#include <linux/elf.h>
12#include <asm/kexec.h>
13
14/* Verify architecture specific macros are defined */
15
16#ifndef KEXEC_SOURCE_MEMORY_LIMIT
17#error KEXEC_SOURCE_MEMORY_LIMIT not defined
18#endif
19
20#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
21#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
22#endif
23
24#ifndef KEXEC_CONTROL_MEMORY_LIMIT
25#error KEXEC_CONTROL_MEMORY_LIMIT not defined
26#endif
27
28#ifndef KEXEC_CONTROL_CODE_SIZE
29#error KEXEC_CONTROL_CODE_SIZE not defined
30#endif
31
32#ifndef KEXEC_ARCH
33#error KEXEC_ARCH not defined
34#endif
35
36#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
37#define KEXEC_CORE_NOTE_NAME "CORE"
38#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
39#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
40/*
41 * The per-cpu notes area is a list of notes terminated by a "NULL"
42 * note header. For kdump, the code in vmcore.c runs in the context
43 * of the second kernel to combine them into one note.
44 */
45#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
46 KEXEC_CORE_NOTE_NAME_BYTES + \
47 KEXEC_CORE_NOTE_DESC_BYTES )
48
49/*
50 * This structure is used to hold the arguments that are used when loading
51 * kernel binaries.
52 */
53
54typedef unsigned long kimage_entry_t;
55#define IND_DESTINATION 0x1
56#define IND_INDIRECTION 0x2
57#define IND_DONE 0x4
58#define IND_SOURCE 0x8
59
60#define KEXEC_SEGMENT_MAX 16
61struct kexec_segment {
62 void __user *buf;
63 size_t bufsz;
64 unsigned long mem; /* User space sees this as a (void *) ... */
65 size_t memsz;
66};
67
68#ifdef CONFIG_COMPAT
69struct compat_kexec_segment {
70 compat_uptr_t buf;
71 compat_size_t bufsz;
72 compat_ulong_t mem; /* User space sees this as a (void *) ... */
73 compat_size_t memsz;
74};
75#endif
76
77struct kimage {
78 kimage_entry_t head;
79 kimage_entry_t *entry;
80 kimage_entry_t *last_entry;
81
82 unsigned long destination;
83
84 unsigned long start;
85 struct page *control_code_page;
86
87 unsigned long nr_segments;
88 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
89
90 struct list_head control_pages;
91 struct list_head dest_pages;
92 struct list_head unuseable_pages;
93
94 /* Address of next control page to allocate for crash kernels. */
95 unsigned long control_page;
96
97 /* Flags to indicate special processing */
98 unsigned int type : 1;
99#define KEXEC_TYPE_DEFAULT 0
100#define KEXEC_TYPE_CRASH 1
101};
102
103
104
105/* kexec interface functions */
106extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
107extern int machine_kexec_prepare(struct kimage *image);
108extern void machine_kexec_cleanup(struct kimage *image);
109extern asmlinkage long sys_kexec_load(unsigned long entry,
110 unsigned long nr_segments,
111 struct kexec_segment __user *segments,
112 unsigned long flags);
113#ifdef CONFIG_COMPAT
114extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
115 unsigned long nr_segments,
116 struct compat_kexec_segment __user *segments,
117 unsigned long flags);
118#endif
119extern struct page *kimage_alloc_control_pages(struct kimage *image,
120 unsigned int order);
121extern void crash_kexec(struct pt_regs *);
122int kexec_should_crash(struct task_struct *);
123void crash_save_cpu(struct pt_regs *regs, int cpu);
124extern struct kimage *kexec_image;
125extern struct kimage *kexec_crash_image;
126
127#ifndef kexec_flush_icache_page
128#define kexec_flush_icache_page(page)
129#endif
130
131#define KEXEC_ON_CRASH 0x00000001
132#define KEXEC_ARCH_MASK 0xffff0000
133
134/* These values match the ELF architecture values.
135 * Unless there is a good reason that should continue to be the case.
136 */
137#define KEXEC_ARCH_DEFAULT ( 0 << 16)
138#define KEXEC_ARCH_386 ( 3 << 16)
139#define KEXEC_ARCH_X86_64 (62 << 16)
140#define KEXEC_ARCH_PPC (20 << 16)
141#define KEXEC_ARCH_PPC64 (21 << 16)
142#define KEXEC_ARCH_IA_64 (50 << 16)
143#define KEXEC_ARCH_ARM (40 << 16)
144#define KEXEC_ARCH_S390 (22 << 16)
145#define KEXEC_ARCH_SH (42 << 16)
146#define KEXEC_ARCH_MIPS_LE (10 << 16)
147#define KEXEC_ARCH_MIPS ( 8 << 16)
148
149#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
150
151/* Location of a reserved region to hold the crash kernel.
152 */
153extern struct resource crashk_res;
154typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
155extern note_buf_t *crash_notes;
156
157
158#else /* !CONFIG_KEXEC */
159struct pt_regs;
160struct task_struct;
161static inline void crash_kexec(struct pt_regs *regs) { }
162static inline int kexec_should_crash(struct task_struct *p) { return 0; }
163#endif /* CONFIG_KEXEC */
164#endif /* LINUX_KEXEC_H */