5 #include <linux/types.h>
6 #include <linux/list.h>
7 #include <linux/linkage.h>
8 #include <linux/compat.h>
11 /* Verify architecture specific macros are defined */
13 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
14 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
17 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
18 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
21 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
22 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
25 #ifndef KEXEC_CONTROL_CODE_SIZE
26 #error KEXEC_CONTROL_CODE_SIZE not defined
30 #error KEXEC_ARCH not defined
34 * This structure is used to hold the arguments that are used when loading
38 typedef unsigned long kimage_entry_t;
39 #define IND_DESTINATION 0x1
40 #define IND_INDIRECTION 0x2
42 #define IND_SOURCE 0x8
44 #define KEXEC_SEGMENT_MAX 16
45 struct kexec_segment {
48 unsigned long mem; /* User space sees this as a (void *) ... */
53 struct compat_kexec_segment {
56 compat_ulong_t mem; /* User space sees this as a (void *) ... */
63 kimage_entry_t *entry;
64 kimage_entry_t *last_entry;
66 unsigned long destination;
69 struct page *control_code_page;
71 unsigned long nr_segments;
72 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
74 struct list_head control_pages;
75 struct list_head dest_pages;
76 struct list_head unuseable_pages;
78 /* Address of next control page to allocate for crash kernels. */
79 unsigned long control_page;
81 /* Flags to indicate special processing */
82 unsigned int type : 1;
83 #define KEXEC_TYPE_DEFAULT 0
84 #define KEXEC_TYPE_CRASH 1
89 /* kexec interface functions */
90 extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
91 extern int machine_kexec_prepare(struct kimage *image);
92 extern void machine_kexec_cleanup(struct kimage *image);
93 extern asmlinkage long sys_kexec_load(unsigned long entry,
94 unsigned long nr_segments,
95 struct kexec_segment __user *segments,
98 extern 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);
103 extern struct page *kimage_alloc_control_pages(struct kimage *image,
105 extern void crash_kexec(struct pt_regs *);
106 int kexec_should_crash(struct task_struct *);
107 extern struct kimage *kexec_image;
109 #define KEXEC_ON_CRASH 0x00000001
110 #define KEXEC_ARCH_MASK 0xffff0000
112 /* These values match the ELF architecture values.
113 * Unless there is a good reason that should continue to be the case.
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 #define KEXEC_ARCH_SH (42 << 16)
124 #define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
126 /* Location of a reserved region to hold the crash kernel.
128 extern struct resource crashk_res;
129 typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
130 extern note_buf_t *crash_notes;
132 #else /* !CONFIG_KEXEC */
135 static inline void crash_kexec(struct pt_regs *regs) { }
136 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
137 #endif /* CONFIG_KEXEC */
138 #endif /* LINUX_KEXEC_H */