4 #define IND_DESTINATION_BIT 0
5 #define IND_INDIRECTION_BIT 1
7 #define IND_SOURCE_BIT 3
9 #define IND_DESTINATION (1 << IND_DESTINATION_BIT)
10 #define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
11 #define IND_DONE (1 << IND_DONE_BIT)
12 #define IND_SOURCE (1 << IND_SOURCE_BIT)
13 #define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
15 #if !defined(__ASSEMBLY__)
19 #include <uapi/linux/kexec.h>
21 #ifdef CONFIG_KEXEC_CORE
22 #include <linux/list.h>
23 #include <linux/linkage.h>
24 #include <linux/compat.h>
25 #include <linux/ioport.h>
26 #include <linux/elfcore.h>
27 #include <linux/elf.h>
28 #include <linux/module.h>
29 #include <asm/kexec.h>
31 /* Verify architecture specific macros are defined */
33 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
34 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
37 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
38 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
41 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
42 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
45 #ifndef KEXEC_CONTROL_MEMORY_GFP
46 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
49 #ifndef KEXEC_CONTROL_PAGE_SIZE
50 #error KEXEC_CONTROL_PAGE_SIZE not defined
54 #error KEXEC_ARCH not defined
57 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
58 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
61 #ifndef KEXEC_CRASH_MEM_ALIGN
62 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
65 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
66 #define KEXEC_CORE_NOTE_NAME "CORE"
67 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
68 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
70 * The per-cpu notes area is a list of notes terminated by a "NULL"
71 * note header. For kdump, the code in vmcore.c runs in the context
72 * of the second kernel to combine them into one note.
74 #ifndef KEXEC_NOTE_BYTES
75 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
76 KEXEC_CORE_NOTE_NAME_BYTES + \
77 KEXEC_CORE_NOTE_DESC_BYTES )
81 * This structure is used to hold the arguments that are used when loading
85 typedef unsigned long kimage_entry_t;
87 struct kexec_segment {
89 * This pointer can point to user memory if kexec_load() system
90 * call is used or will point to kernel memory if
91 * kexec_file_load() system call is used.
93 * Use ->buf when expecting to deal with user memory and use ->kbuf
94 * when expecting to deal with kernel memory.
106 struct compat_kexec_segment {
109 compat_ulong_t mem; /* User space sees this as a (void *) ... */
114 #ifdef CONFIG_KEXEC_FILE
115 struct purgatory_info {
116 /* Pointer to elf header of read only purgatory */
119 /* Pointer to purgatory sechdrs which are modifiable */
122 * Temporary buffer location where purgatory is loaded and relocated
123 * This memory can be freed post image load
127 /* Address where purgatory is finally loaded and is executed from */
128 unsigned long purgatory_load_addr;
131 typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
132 typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
133 unsigned long kernel_len, char *initrd,
134 unsigned long initrd_len, char *cmdline,
135 unsigned long cmdline_len);
136 typedef int (kexec_cleanup_t)(void *loader_data);
138 #ifdef CONFIG_KEXEC_VERIFY_SIG
139 typedef int (kexec_verify_sig_t)(const char *kernel_buf,
140 unsigned long kernel_len);
143 struct kexec_file_ops {
144 kexec_probe_t *probe;
146 kexec_cleanup_t *cleanup;
147 #ifdef CONFIG_KEXEC_VERIFY_SIG
148 kexec_verify_sig_t *verify_sig;
152 #ifndef arch_kexec_apply_relocations_add
153 /* Apply relocations of type RELA */
155 arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
156 Elf_Shdr *sechdrs, unsigned int relsec)
158 pr_err("RELA relocation unsupported.\n");
163 #ifndef arch_kexec_apply_relocations
164 /* Apply relocations of type REL */
166 arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
169 pr_err("REL relocation unsupported.\n");
177 kimage_entry_t *entry;
178 kimage_entry_t *last_entry;
181 struct page *control_code_page;
182 struct page *swap_page;
184 unsigned long nr_segments;
185 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
187 struct list_head control_pages;
188 struct list_head dest_pages;
189 struct list_head unusable_pages;
191 /* Address of next control page to allocate for crash kernels. */
192 unsigned long control_page;
194 /* Flags to indicate special processing */
195 unsigned int type : 1;
196 #define KEXEC_TYPE_DEFAULT 0
197 #define KEXEC_TYPE_CRASH 1
198 unsigned int preserve_context : 1;
199 /* If set, we are using file mode kexec syscall */
200 unsigned int file_mode:1;
202 #ifdef ARCH_HAS_KIMAGE_ARCH
203 struct kimage_arch arch;
206 #ifdef CONFIG_KEXEC_FILE
207 /* Additional fields for file based kexec syscall */
209 unsigned long kernel_buf_len;
212 unsigned long initrd_buf_len;
215 unsigned long cmdline_buf_len;
217 /* File operations provided by image loader */
218 struct kexec_file_ops *fops;
220 /* Image loader handling the kernel can store a pointer here */
221 void *image_loader_data;
223 /* Information for loading purgatory */
224 struct purgatory_info purgatory_info;
228 /* kexec interface functions */
229 extern void machine_kexec(struct kimage *image);
230 extern int machine_kexec_prepare(struct kimage *image);
231 extern void machine_kexec_cleanup(struct kimage *image);
232 extern asmlinkage long sys_kexec_load(unsigned long entry,
233 unsigned long nr_segments,
234 struct kexec_segment __user *segments,
235 unsigned long flags);
236 extern int kernel_kexec(void);
237 extern int kexec_add_buffer(struct kimage *image, char *buffer,
238 unsigned long bufsz, unsigned long memsz,
239 unsigned long buf_align, unsigned long buf_min,
240 unsigned long buf_max, bool top_down,
241 unsigned long *load_addr);
242 extern struct page *kimage_alloc_control_pages(struct kimage *image,
244 extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
245 unsigned long max, int top_down,
246 unsigned long *load_addr);
247 extern int kexec_purgatory_get_set_symbol(struct kimage *image,
248 const char *name, void *buf,
249 unsigned int size, bool get_value);
250 extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
252 extern void __crash_kexec(struct pt_regs *);
253 extern void crash_kexec(struct pt_regs *);
254 int kexec_should_crash(struct task_struct *);
255 int kexec_crash_loaded(void);
256 void crash_save_cpu(struct pt_regs *regs, int cpu);
257 void crash_save_vmcoreinfo(void);
258 void arch_crash_save_vmcoreinfo(void);
260 void vmcoreinfo_append_str(const char *fmt, ...);
261 phys_addr_t paddr_vmcoreinfo_note(void);
263 #define VMCOREINFO_OSRELEASE(value) \
264 vmcoreinfo_append_str("OSRELEASE=%s\n", value)
265 #define VMCOREINFO_PAGESIZE(value) \
266 vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
267 #define VMCOREINFO_SYMBOL(name) \
268 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
269 #define VMCOREINFO_SIZE(name) \
270 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
271 (unsigned long)sizeof(name))
272 #define VMCOREINFO_STRUCT_SIZE(name) \
273 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
274 (unsigned long)sizeof(struct name))
275 #define VMCOREINFO_OFFSET(name, field) \
276 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
277 (unsigned long)offsetof(struct name, field))
278 #define VMCOREINFO_LENGTH(name, value) \
279 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
280 #define VMCOREINFO_NUMBER(name) \
281 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
282 #define VMCOREINFO_CONFIG(name) \
283 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
284 #define VMCOREINFO_PAGE_OFFSET(value) \
285 vmcoreinfo_append_str("PAGE_OFFSET=%lx\n", (unsigned long)value)
286 #define VMCOREINFO_VMALLOC_START(value) \
287 vmcoreinfo_append_str("VMALLOC_START=%lx\n", (unsigned long)value)
288 #define VMCOREINFO_VMEMMAP_START(value) \
289 vmcoreinfo_append_str("VMEMMAP_START=%lx\n", (unsigned long)value)
291 extern struct kimage *kexec_image;
292 extern struct kimage *kexec_crash_image;
293 extern int kexec_load_disabled;
295 #ifndef kexec_flush_icache_page
296 #define kexec_flush_icache_page(page)
299 /* List of defined/legal kexec flags */
300 #ifndef CONFIG_KEXEC_JUMP
301 #define KEXEC_FLAGS KEXEC_ON_CRASH
303 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
306 /* List of defined/legal kexec file flags */
307 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
308 KEXEC_FILE_NO_INITRAMFS)
310 #define VMCOREINFO_BYTES (4096)
311 #define VMCOREINFO_NOTE_NAME "VMCOREINFO"
312 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
313 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
314 + VMCOREINFO_NOTE_NAME_BYTES)
316 /* Location of a reserved region to hold the crash kernel.
318 extern struct resource crashk_res;
319 extern struct resource crashk_low_res;
320 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
321 extern note_buf_t __percpu *crash_notes;
322 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
323 extern size_t vmcoreinfo_size;
324 extern size_t vmcoreinfo_max_size;
326 /* flag to track if kexec reboot is in progress */
327 extern bool kexec_in_progress;
329 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
330 unsigned long long *crash_size, unsigned long long *crash_base);
331 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
332 unsigned long long *crash_size, unsigned long long *crash_base);
333 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
334 unsigned long long *crash_size, unsigned long long *crash_base);
335 int crash_shrink_memory(unsigned long new_size);
336 size_t crash_get_memory_size(void);
337 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
339 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
340 unsigned long buf_len);
341 void * __weak arch_kexec_kernel_image_load(struct kimage *image);
342 int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
343 int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
344 unsigned long buf_len);
345 void arch_kexec_protect_crashkres(void);
346 void arch_kexec_unprotect_crashkres(void);
348 #ifndef page_to_boot_pfn
349 static inline unsigned long page_to_boot_pfn(struct page *page)
351 return page_to_pfn(page);
355 #ifndef boot_pfn_to_page
356 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
358 return pfn_to_page(boot_pfn);
362 #ifndef phys_to_boot_phys
363 static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
369 #ifndef boot_phys_to_phys
370 static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
376 static inline unsigned long virt_to_boot_phys(void *addr)
378 return phys_to_boot_phys(__pa((unsigned long)addr));
381 static inline void *boot_phys_to_virt(unsigned long entry)
383 return phys_to_virt(boot_phys_to_phys(entry));
386 #else /* !CONFIG_KEXEC_CORE */
389 static inline void __crash_kexec(struct pt_regs *regs) { }
390 static inline void crash_kexec(struct pt_regs *regs) { }
391 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
392 static inline int kexec_crash_loaded(void) { return 0; }
393 #define kexec_in_progress false
394 #endif /* CONFIG_KEXEC_CORE */
396 #endif /* !defined(__ASSEBMLY__) */
398 #endif /* LINUX_KEXEC_H */