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Eric W. Biedermandc009d92005-06-25 14:57:52 -07001#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>
Haren Myneni9c15e852006-02-10 01:51:05 -08009#include <linux/ioport.h>
Simon Horman6672f762007-05-08 00:28:22 -070010#include <linux/elfcore.h>
11#include <linux/elf.h>
Eric W. Biedermandc009d92005-06-25 14:57:52 -070012#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
Simon Horman6672f762007-05-08 00:28:22 -070036#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
Eric W. Biedermandc009d92005-06-25 14:57:52 -070049/*
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
akpm@osdl.org720e1a92006-01-09 20:51:51 -080060#define KEXEC_SEGMENT_MAX 16
Eric W. Biedermandc009d92005-06-25 14:57:52 -070061struct 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,
Maneesh Soni72414d32005-06-25 14:58:28 -0700110 unsigned long nr_segments,
111 struct kexec_segment __user *segments,
112 unsigned long flags);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700113#ifdef CONFIG_COMPAT
114extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
Maneesh Soni72414d32005-06-25 14:58:28 -0700115 unsigned long nr_segments,
116 struct compat_kexec_segment __user *segments,
117 unsigned long flags);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700118#endif
Maneesh Soni72414d32005-06-25 14:58:28 -0700119extern struct page *kimage_alloc_control_pages(struct kimage *image,
120 unsigned int order);
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700121extern void crash_kexec(struct pt_regs *);
122int kexec_should_crash(struct task_struct *);
Magnus Damm85916f82006-12-06 20:40:41 -0800123void crash_save_cpu(struct pt_regs *regs, int cpu);
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700124void crash_save_vmcoreinfo(void);
125void arch_crash_save_vmcoreinfo(void);
Ken'ichi Ohmichid7682812007-10-16 23:27:28 -0700126void vmcoreinfo_append_str(const char *fmt, ...)
127 __attribute__ ((format (printf, 1, 2)));
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700128unsigned long paddr_vmcoreinfo_note(void);
129
130#define SYMBOL(name) \
131 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
132#define SIZE(name) \
Ken'ichi Ohmichid7682812007-10-16 23:27:28 -0700133 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
134 (unsigned long)sizeof(struct name))
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700135#define OFFSET(name, field) \
Ken'ichi Ohmichid7682812007-10-16 23:27:28 -0700136 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
137 (unsigned long)&(((struct name *)0)->field))
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700138#define LENGTH(name, value) \
Ken'ichi Ohmichid7682812007-10-16 23:27:28 -0700139 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700140#define CONFIG(name) \
141 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
142
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700143extern struct kimage *kexec_image;
Jeff Moyerc330dda2006-06-23 02:05:07 -0700144extern struct kimage *kexec_crash_image;
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700145
Zou Nan haia7956112006-12-07 09:51:35 -0800146#ifndef kexec_flush_icache_page
147#define kexec_flush_icache_page(page)
148#endif
149
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700150#define KEXEC_ON_CRASH 0x00000001
151#define KEXEC_ARCH_MASK 0xffff0000
152
153/* These values match the ELF architecture values.
154 * Unless there is a good reason that should continue to be the case.
155 */
156#define KEXEC_ARCH_DEFAULT ( 0 << 16)
157#define KEXEC_ARCH_386 ( 3 << 16)
158#define KEXEC_ARCH_X86_64 (62 << 16)
159#define KEXEC_ARCH_PPC (20 << 16)
160#define KEXEC_ARCH_PPC64 (21 << 16)
161#define KEXEC_ARCH_IA_64 (50 << 16)
Richard Purdiec587e4a2007-02-06 21:29:00 +0100162#define KEXEC_ARCH_ARM (40 << 16)
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700163#define KEXEC_ARCH_S390 (22 << 16)
kogiidena9d441902006-01-16 22:14:10 -0800164#define KEXEC_ARCH_SH (42 << 16)
Nicolas Schichan583bb862006-10-18 15:14:55 +0200165#define KEXEC_ARCH_MIPS_LE (10 << 16)
166#define KEXEC_ARCH_MIPS ( 8 << 16)
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700167
168#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
169
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700170#define VMCOREINFO_BYTES (4096)
171#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
172#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
173#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
174 + VMCOREINFO_NOTE_NAME_BYTES)
175
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700176/* Location of a reserved region to hold the crash kernel.
177 */
178extern struct resource crashk_res;
Simon Horman6672f762007-05-08 00:28:22 -0700179typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
Vivek Goyalcc571652006-01-09 20:51:41 -0800180extern note_buf_t *crash_notes;
Ken'ichi Ohmichifd59d232007-10-16 23:27:27 -0700181extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
Ken'ichi Ohmichid7682812007-10-16 23:27:28 -0700182extern size_t vmcoreinfo_size;
183extern size_t vmcoreinfo_max_size;
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700184
Zou Nan haia7956112006-12-07 09:51:35 -0800185
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700186#else /* !CONFIG_KEXEC */
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700187struct pt_regs;
188struct task_struct;
189static inline void crash_kexec(struct pt_regs *regs) { }
190static inline int kexec_should_crash(struct task_struct *p) { return 0; }
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700191#endif /* CONFIG_KEXEC */
192#endif /* LINUX_KEXEC_H */