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__)
17 #include <linux/crash_core.h>
20 #include <uapi/linux/kexec.h>
22 #ifdef CONFIG_KEXEC_CORE
23 #include <linux/list.h>
24 #include <linux/compat.h>
25 #include <linux/ioport.h>
26 #include <linux/module.h>
27 #include <asm/kexec.h>
29 /* Verify architecture specific macros are defined */
31 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
32 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
35 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
36 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
39 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
40 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
43 #ifndef KEXEC_CONTROL_MEMORY_GFP
44 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
47 #ifndef KEXEC_CONTROL_PAGE_SIZE
48 #error KEXEC_CONTROL_PAGE_SIZE not defined
52 #error KEXEC_ARCH not defined
55 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
56 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
59 #ifndef KEXEC_CRASH_MEM_ALIGN
60 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
63 #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
66 * The per-cpu notes area is a list of notes terminated by a "NULL"
67 * note header. For kdump, the code in vmcore.c runs in the context
68 * of the second kernel to combine them into one note.
70 #ifndef KEXEC_NOTE_BYTES
71 #define KEXEC_NOTE_BYTES CRASH_CORE_NOTE_BYTES
75 * This structure is used to hold the arguments that are used when loading
79 typedef unsigned long kimage_entry_t;
81 struct kexec_segment {
83 * This pointer can point to user memory if kexec_load() system
84 * call is used or will point to kernel memory if
85 * kexec_file_load() system call is used.
87 * Use ->buf when expecting to deal with user memory and use ->kbuf
88 * when expecting to deal with kernel memory.
100 struct compat_kexec_segment {
103 compat_ulong_t mem; /* User space sees this as a (void *) ... */
108 #ifdef CONFIG_KEXEC_FILE
109 struct purgatory_info {
110 /* Pointer to elf header of read only purgatory */
113 /* Pointer to purgatory sechdrs which are modifiable */
116 * Temporary buffer location where purgatory is loaded and relocated
117 * This memory can be freed post image load
121 /* Address where purgatory is finally loaded and is executed from */
122 unsigned long purgatory_load_addr;
125 typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
126 typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
127 unsigned long kernel_len, char *initrd,
128 unsigned long initrd_len, char *cmdline,
129 unsigned long cmdline_len);
130 typedef int (kexec_cleanup_t)(void *loader_data);
132 #ifdef CONFIG_KEXEC_VERIFY_SIG
133 typedef int (kexec_verify_sig_t)(const char *kernel_buf,
134 unsigned long kernel_len);
137 struct kexec_file_ops {
138 kexec_probe_t *probe;
140 kexec_cleanup_t *cleanup;
141 #ifdef CONFIG_KEXEC_VERIFY_SIG
142 kexec_verify_sig_t *verify_sig;
147 * struct kexec_buf - parameters for finding a place for a buffer in memory
148 * @image: kexec image in which memory to search.
149 * @buffer: Contents which will be copied to the allocated memory.
150 * @bufsz: Size of @buffer.
151 * @mem: On return will have address of the buffer in memory.
152 * @memsz: Size for the buffer in memory.
153 * @buf_align: Minimum alignment needed.
154 * @buf_min: The buffer can't be placed below this address.
155 * @buf_max: The buffer can't be placed above this address.
156 * @top_down: Allocate from top of memory.
159 struct kimage *image;
164 unsigned long buf_align;
165 unsigned long buf_min;
166 unsigned long buf_max;
170 int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
171 int (*func)(u64, u64, void *));
172 extern int kexec_add_buffer(struct kexec_buf *kbuf);
173 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
174 #endif /* CONFIG_KEXEC_FILE */
178 kimage_entry_t *entry;
179 kimage_entry_t *last_entry;
182 struct page *control_code_page;
183 struct page *swap_page;
185 unsigned long nr_segments;
186 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
188 struct list_head control_pages;
189 struct list_head dest_pages;
190 struct list_head unusable_pages;
192 /* Address of next control page to allocate for crash kernels. */
193 unsigned long control_page;
195 /* Flags to indicate special processing */
196 unsigned int type : 1;
197 #define KEXEC_TYPE_DEFAULT 0
198 #define KEXEC_TYPE_CRASH 1
199 unsigned int preserve_context : 1;
200 /* If set, we are using file mode kexec syscall */
201 unsigned int file_mode:1;
203 #ifdef ARCH_HAS_KIMAGE_ARCH
204 struct kimage_arch arch;
207 #ifdef CONFIG_KEXEC_FILE
208 /* Additional fields for file based kexec syscall */
210 unsigned long kernel_buf_len;
213 unsigned long initrd_buf_len;
216 unsigned long cmdline_buf_len;
218 /* File operations provided by image loader */
219 struct kexec_file_ops *fops;
221 /* Image loader handling the kernel can store a pointer here */
222 void *image_loader_data;
224 /* Information for loading purgatory */
225 struct purgatory_info purgatory_info;
229 /* kexec interface functions */
230 extern void machine_kexec(struct kimage *image);
231 extern int machine_kexec_prepare(struct kimage *image);
232 extern void machine_kexec_cleanup(struct kimage *image);
233 extern asmlinkage long sys_kexec_load(unsigned long entry,
234 unsigned long nr_segments,
235 struct kexec_segment __user *segments,
236 unsigned long flags);
237 extern int kernel_kexec(void);
238 extern struct page *kimage_alloc_control_pages(struct kimage *image,
240 extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
241 unsigned long max, int top_down,
242 unsigned long *load_addr);
243 extern int kexec_purgatory_get_set_symbol(struct kimage *image,
244 const char *name, void *buf,
245 unsigned int size, bool get_value);
246 extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
248 extern void __crash_kexec(struct pt_regs *);
249 extern void crash_kexec(struct pt_regs *);
250 int kexec_should_crash(struct task_struct *);
251 int kexec_crash_loaded(void);
252 void crash_save_cpu(struct pt_regs *regs, int cpu);
254 extern struct kimage *kexec_image;
255 extern struct kimage *kexec_crash_image;
256 extern int kexec_load_disabled;
258 #ifndef kexec_flush_icache_page
259 #define kexec_flush_icache_page(page)
262 /* List of defined/legal kexec flags */
263 #ifndef CONFIG_KEXEC_JUMP
264 #define KEXEC_FLAGS KEXEC_ON_CRASH
266 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
269 /* List of defined/legal kexec file flags */
270 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
271 KEXEC_FILE_NO_INITRAMFS)
273 /* Location of a reserved region to hold the crash kernel.
275 extern struct resource crashk_res;
276 extern struct resource crashk_low_res;
277 extern note_buf_t __percpu *crash_notes;
279 /* flag to track if kexec reboot is in progress */
280 extern bool kexec_in_progress;
282 int crash_shrink_memory(unsigned long new_size);
283 size_t crash_get_memory_size(void);
284 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
286 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
287 unsigned long buf_len);
288 void * __weak arch_kexec_kernel_image_load(struct kimage *image);
289 int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
290 int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
291 unsigned long buf_len);
292 int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
293 Elf_Shdr *sechdrs, unsigned int relsec);
294 int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
295 unsigned int relsec);
296 void arch_kexec_protect_crashkres(void);
297 void arch_kexec_unprotect_crashkres(void);
299 #ifndef page_to_boot_pfn
300 static inline unsigned long page_to_boot_pfn(struct page *page)
302 return page_to_pfn(page);
306 #ifndef boot_pfn_to_page
307 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
309 return pfn_to_page(boot_pfn);
313 #ifndef phys_to_boot_phys
314 static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
320 #ifndef boot_phys_to_phys
321 static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
327 static inline unsigned long virt_to_boot_phys(void *addr)
329 return phys_to_boot_phys(__pa((unsigned long)addr));
332 static inline void *boot_phys_to_virt(unsigned long entry)
334 return phys_to_virt(boot_phys_to_phys(entry));
337 #else /* !CONFIG_KEXEC_CORE */
340 static inline void __crash_kexec(struct pt_regs *regs) { }
341 static inline void crash_kexec(struct pt_regs *regs) { }
342 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
343 static inline int kexec_crash_loaded(void) { return 0; }
344 #define kexec_in_progress false
345 #endif /* CONFIG_KEXEC_CORE */
347 #endif /* !defined(__ASSEBMLY__) */
349 #endif /* LINUX_KEXEC_H */