Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 <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_PAGE_SIZE
29#error KEXEC_CONTROL_PAGE_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 struct page *swap_page;
87
88 unsigned long nr_segments;
89 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
90
91 struct list_head control_pages;
92 struct list_head dest_pages;
93 struct list_head unuseable_pages;
94
95 /* Address of next control page to allocate for crash kernels. */
96 unsigned long control_page;
97
98 /* Flags to indicate special processing */
99 unsigned int type : 1;
100#define KEXEC_TYPE_DEFAULT 0
101#define KEXEC_TYPE_CRASH 1
102 unsigned int preserve_context : 1;
103
104#ifdef ARCH_HAS_KIMAGE_ARCH
105 struct kimage_arch arch;
106#endif
107};
108
109
110
111/* kexec interface functions */
112extern void machine_kexec(struct kimage *image);
113extern int machine_kexec_prepare(struct kimage *image);
114extern void machine_kexec_cleanup(struct kimage *image);
115extern asmlinkage long sys_kexec_load(unsigned long entry,
116 unsigned long nr_segments,
117 struct kexec_segment __user *segments,
118 unsigned long flags);
119extern int kernel_kexec(void);
120#ifdef CONFIG_COMPAT
121extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
122 unsigned long nr_segments,
123 struct compat_kexec_segment __user *segments,
124 unsigned long flags);
125#endif
126extern struct page *kimage_alloc_control_pages(struct kimage *image,
127 unsigned int order);
128extern void crash_kexec(struct pt_regs *);
129int kexec_should_crash(struct task_struct *);
130void crash_save_cpu(struct pt_regs *regs, int cpu);
131void crash_save_vmcoreinfo(void);
132void arch_crash_save_vmcoreinfo(void);
133void vmcoreinfo_append_str(const char *fmt, ...)
134 __attribute__ ((format (printf, 1, 2)));
135unsigned long paddr_vmcoreinfo_note(void);
136
137#define VMCOREINFO_OSRELEASE(value) \
138 vmcoreinfo_append_str("OSRELEASE=%s\n", value)
139#define VMCOREINFO_PAGESIZE(value) \
140 vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
141#define VMCOREINFO_SYMBOL(name) \
142 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
143#define VMCOREINFO_SIZE(name) \
144 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
145 (unsigned long)sizeof(name))
146#define VMCOREINFO_STRUCT_SIZE(name) \
147 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
148 (unsigned long)sizeof(struct name))
149#define VMCOREINFO_OFFSET(name, field) \
150 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
151 (unsigned long)offsetof(struct name, field))
152#define VMCOREINFO_LENGTH(name, value) \
153 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
154#define VMCOREINFO_NUMBER(name) \
155 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
156#define VMCOREINFO_CONFIG(name) \
157 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
158
159extern struct kimage *kexec_image;
160extern struct kimage *kexec_crash_image;
161
162#ifndef kexec_flush_icache_page
163#define kexec_flush_icache_page(page)
164#endif
165
166#define KEXEC_ON_CRASH 0x00000001
167#define KEXEC_PRESERVE_CONTEXT 0x00000002
168#define KEXEC_ARCH_MASK 0xffff0000
169
170/* These values match the ELF architecture values.
171 * Unless there is a good reason that should continue to be the case.
172 */
173#define KEXEC_ARCH_DEFAULT ( 0 << 16)
174#define KEXEC_ARCH_386 ( 3 << 16)
175#define KEXEC_ARCH_X86_64 (62 << 16)
176#define KEXEC_ARCH_PPC (20 << 16)
177#define KEXEC_ARCH_PPC64 (21 << 16)
178#define KEXEC_ARCH_IA_64 (50 << 16)
179#define KEXEC_ARCH_ARM (40 << 16)
180#define KEXEC_ARCH_S390 (22 << 16)
181#define KEXEC_ARCH_SH (42 << 16)
182#define KEXEC_ARCH_MIPS_LE (10 << 16)
183#define KEXEC_ARCH_MIPS ( 8 << 16)
184
185/* List of defined/legal kexec flags */
186#ifndef CONFIG_KEXEC_JUMP
187#define KEXEC_FLAGS KEXEC_ON_CRASH
188#else
189#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
190#endif
191
192#define VMCOREINFO_BYTES (4096)
193#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
194#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
195#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
196 + VMCOREINFO_NOTE_NAME_BYTES)
197
198/* Location of a reserved region to hold the crash kernel.
199 */
200extern struct resource crashk_res;
201typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
202extern note_buf_t __percpu *crash_notes;
203extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
204extern size_t vmcoreinfo_size;
205extern size_t vmcoreinfo_max_size;
206
207int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
208 unsigned long long *crash_size, unsigned long long *crash_base);
209int crash_shrink_memory(unsigned long new_size);
210size_t crash_get_memory_size(void);
211void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
212
213#else /* !CONFIG_KEXEC */
214struct pt_regs;
215struct task_struct;
216static inline void crash_kexec(struct pt_regs *regs) { }
217static inline int kexec_should_crash(struct task_struct *p) { return 0; }
218#endif /* CONFIG_KEXEC */
219#endif /* LINUX_KEXEC_H */