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 extern struct page *kimage_alloc_control_pages(struct kimage *image, 131 unsigned int order); 132 extern void crash_kexec(struct pt_regs *); 133 int kexec_should_crash(struct task_struct *); 134 void crash_save_cpu(struct pt_regs *regs, int cpu); 135 void crash_save_vmcoreinfo(void); 136 void crash_map_reserved_pages(void); 137 void crash_unmap_reserved_pages(void); 138 void arch_crash_save_vmcoreinfo(void); 139 __printf(1, 2) 140 void vmcoreinfo_append_str(const char *fmt, ...); 141 unsigned long paddr_vmcoreinfo_note(void); 142 143 #define VMCOREINFO_OSRELEASE(value) \ 144 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 145 #define VMCOREINFO_PAGESIZE(value) \ 146 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 147 #define VMCOREINFO_SYMBOL(name) \ 148 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 149 #define VMCOREINFO_SIZE(name) \ 150 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 151 (unsigned long)sizeof(name)) 152 #define VMCOREINFO_STRUCT_SIZE(name) \ 153 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 154 (unsigned long)sizeof(struct name)) 155 #define VMCOREINFO_OFFSET(name, field) \ 156 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 157 (unsigned long)offsetof(struct name, field)) 158 #define VMCOREINFO_LENGTH(name, value) \ 159 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 160 #define VMCOREINFO_NUMBER(name) \ 161 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 162 #define VMCOREINFO_CONFIG(name) \ 163 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 164 165 extern struct kimage *kexec_image; 166 extern struct kimage *kexec_crash_image; 167 extern int kexec_load_disabled; 168 169 #ifndef kexec_flush_icache_page 170 #define kexec_flush_icache_page(page) 171 #endif 172 173 /* List of defined/legal kexec flags */ 174 #ifndef CONFIG_KEXEC_JUMP 175 #define KEXEC_FLAGS KEXEC_ON_CRASH 176 #else 177 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) 178 #endif 179 180 #define VMCOREINFO_BYTES (4096) 181 #define VMCOREINFO_NOTE_NAME "VMCOREINFO" 182 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) 183 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ 184 + VMCOREINFO_NOTE_NAME_BYTES) 185 186 /* Location of a reserved region to hold the crash kernel. 187 */ 188 extern struct resource crashk_res; 189 extern struct resource crashk_low_res; 190 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; 191 extern note_buf_t __percpu *crash_notes; 192 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; 193 extern size_t vmcoreinfo_size; 194 extern size_t vmcoreinfo_max_size; 195 196 /* flag to track if kexec reboot is in progress */ 197 extern bool kexec_in_progress; 198 199 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, 200 unsigned long long *crash_size, unsigned long long *crash_base); 201 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, 202 unsigned long long *crash_size, unsigned long long *crash_base); 203 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram, 204 unsigned long long *crash_size, unsigned long long *crash_base); 205 int crash_shrink_memory(unsigned long new_size); 206 size_t crash_get_memory_size(void); 207 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); 208 209 #else /* !CONFIG_KEXEC */ 210 struct pt_regs; 211 struct task_struct; 212 static inline void crash_kexec(struct pt_regs *regs) { } 213 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 214 #endif /* CONFIG_KEXEC */ 215 #endif /* LINUX_KEXEC_H */ 216