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TOMOYO Linux Cross Reference
Linux/include/linux/kexec.h

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  1 #ifndef LINUX_KEXEC_H
  2 #define LINUX_KEXEC_H
  3 
  4 #include <uapi/linux/kexec.h>
  5 
  6 #ifdef CONFIG_KEXEC
  7 #include <linux/list.h>
  8 #include <linux/linkage.h>
  9 #include <linux/compat.h>
 10 #include <linux/ioport.h>
 11 #include <linux/elfcore.h>
 12 #include <linux/elf.h>
 13 #include <asm/kexec.h>
 14 
 15 /* Verify architecture specific macros are defined */
 16 
 17 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
 18 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
 19 #endif
 20 
 21 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
 22 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
 23 #endif
 24 
 25 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
 26 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
 27 #endif
 28 
 29 #ifndef KEXEC_CONTROL_PAGE_SIZE
 30 #error KEXEC_CONTROL_PAGE_SIZE not defined
 31 #endif
 32 
 33 #ifndef KEXEC_ARCH
 34 #error KEXEC_ARCH not defined
 35 #endif
 36 
 37 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
 38 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
 39 #endif
 40 
 41 #ifndef KEXEC_CRASH_MEM_ALIGN
 42 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
 43 #endif
 44 
 45 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
 46 #define KEXEC_CORE_NOTE_NAME "CORE"
 47 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
 48 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
 49 /*
 50  * The per-cpu notes area is a list of notes terminated by a "NULL"
 51  * note header.  For kdump, the code in vmcore.c runs in the context
 52  * of the second kernel to combine them into one note.
 53  */
 54 #ifndef KEXEC_NOTE_BYTES
 55 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +                \
 56                             KEXEC_CORE_NOTE_NAME_BYTES +                \
 57                             KEXEC_CORE_NOTE_DESC_BYTES )
 58 #endif
 59 
 60 /*
 61  * This structure is used to hold the arguments that are used when loading
 62  * kernel binaries.
 63  */
 64 
 65 typedef unsigned long kimage_entry_t;
 66 #define IND_DESTINATION  0x1
 67 #define IND_INDIRECTION  0x2
 68 #define IND_DONE         0x4
 69 #define IND_SOURCE       0x8
 70 
 71 struct kexec_segment {
 72         void __user *buf;
 73         size_t bufsz;
 74         unsigned long mem;
 75         size_t memsz;
 76 };
 77 
 78 #ifdef CONFIG_COMPAT
 79 struct compat_kexec_segment {
 80         compat_uptr_t buf;
 81         compat_size_t bufsz;
 82         compat_ulong_t mem;     /* User space sees this as a (void *) ... */
 83         compat_size_t memsz;
 84 };
 85 #endif
 86 
 87 struct kimage {
 88         kimage_entry_t head;
 89         kimage_entry_t *entry;
 90         kimage_entry_t *last_entry;
 91 
 92         unsigned long destination;
 93 
 94         unsigned long start;
 95         struct page *control_code_page;
 96         struct page *swap_page;
 97 
 98         unsigned long nr_segments;
 99         struct kexec_segment segment[KEXEC_SEGMENT_MAX];
100 
101         struct list_head control_pages;
102         struct list_head dest_pages;
103         struct list_head unuseable_pages;
104 
105         /* Address of next control page to allocate for crash kernels. */
106         unsigned long control_page;
107 
108         /* Flags to indicate special processing */
109         unsigned int type : 1;
110 #define KEXEC_TYPE_DEFAULT 0
111 #define KEXEC_TYPE_CRASH   1
112         unsigned int preserve_context : 1;
113 
114 #ifdef ARCH_HAS_KIMAGE_ARCH
115         struct kimage_arch arch;
116 #endif
117 };
118 
119 
120 
121 /* kexec interface functions */
122 extern void machine_kexec(struct kimage *image);
123 extern int machine_kexec_prepare(struct kimage *image);
124 extern void machine_kexec_cleanup(struct kimage *image);
125 extern asmlinkage long sys_kexec_load(unsigned long entry,
126                                         unsigned long nr_segments,
127                                         struct kexec_segment __user *segments,
128                                         unsigned long flags);
129 extern int kernel_kexec(void);
130 #ifdef CONFIG_COMPAT
131 extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
132                                 unsigned long nr_segments,
133                                 struct compat_kexec_segment __user *segments,
134                                 unsigned long flags);
135 #endif
136 extern struct page *kimage_alloc_control_pages(struct kimage *image,
137                                                 unsigned int order);
138 extern void crash_kexec(struct pt_regs *);
139 int kexec_should_crash(struct task_struct *);
140 void crash_save_cpu(struct pt_regs *regs, int cpu);
141 void crash_save_vmcoreinfo(void);
142 void crash_map_reserved_pages(void);
143 void crash_unmap_reserved_pages(void);
144 void arch_crash_save_vmcoreinfo(void);
145 __printf(1, 2)
146 void vmcoreinfo_append_str(const char *fmt, ...);
147 unsigned long paddr_vmcoreinfo_note(void);
148 
149 #define VMCOREINFO_OSRELEASE(value) \
150         vmcoreinfo_append_str("OSRELEASE=%s\n", value)
151 #define VMCOREINFO_PAGESIZE(value) \
152         vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
153 #define VMCOREINFO_SYMBOL(name) \
154         vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
155 #define VMCOREINFO_SIZE(name) \
156         vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
157                               (unsigned long)sizeof(name))
158 #define VMCOREINFO_STRUCT_SIZE(name) \
159         vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
160                               (unsigned long)sizeof(struct name))
161 #define VMCOREINFO_OFFSET(name, field) \
162         vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
163                               (unsigned long)offsetof(struct name, field))
164 #define VMCOREINFO_LENGTH(name, value) \
165         vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
166 #define VMCOREINFO_NUMBER(name) \
167         vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
168 #define VMCOREINFO_CONFIG(name) \
169         vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
170 
171 extern struct kimage *kexec_image;
172 extern struct kimage *kexec_crash_image;
173 
174 #ifndef kexec_flush_icache_page
175 #define kexec_flush_icache_page(page)
176 #endif
177 
178 /* List of defined/legal kexec flags */
179 #ifndef CONFIG_KEXEC_JUMP
180 #define KEXEC_FLAGS    KEXEC_ON_CRASH
181 #else
182 #define KEXEC_FLAGS    (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
183 #endif
184 
185 #define VMCOREINFO_BYTES           (4096)
186 #define VMCOREINFO_NOTE_NAME       "VMCOREINFO"
187 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
188 #define VMCOREINFO_NOTE_SIZE       (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
189                                     + VMCOREINFO_NOTE_NAME_BYTES)
190 
191 /* Location of a reserved region to hold the crash kernel.
192  */
193 extern struct resource crashk_res;
194 extern struct resource crashk_low_res;
195 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
196 extern note_buf_t __percpu *crash_notes;
197 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
198 extern size_t vmcoreinfo_size;
199 extern size_t vmcoreinfo_max_size;
200 
201 /* flag to track if kexec reboot is in progress */
202 extern bool kexec_in_progress;
203 
204 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
205                 unsigned long long *crash_size, unsigned long long *crash_base);
206 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
207                 unsigned long long *crash_size, unsigned long long *crash_base);
208 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
209                 unsigned long long *crash_size, unsigned long long *crash_base);
210 int crash_shrink_memory(unsigned long new_size);
211 size_t crash_get_memory_size(void);
212 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
213 
214 #else /* !CONFIG_KEXEC */
215 struct pt_regs;
216 struct task_struct;
217 static inline void crash_kexec(struct pt_regs *regs) { }
218 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
219 #endif /* CONFIG_KEXEC */
220 #endif /* LINUX_KEXEC_H */
221 

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