1 #ifndef LINUX_KEXEC_H 2 #define LINUX_KEXEC_H 3 4 #ifdef CONFIG_KEXEC 5 #include <linux/types.h> 6 #include <linux/list.h> 7 #include <linux/linkage.h> 8 #include <linux/compat.h> 9 #include <linux/ioport.h> 10 #include <linux/elfcore.h> 11 #include <linux/elf.h> 12 #include <asm/kexec.h> 13 14 /* Verify architecture specific macros are defined */ 15 16 #ifndef KEXEC_SOURCE_MEMORY_LIMIT 17 #error KEXEC_SOURCE_MEMORY_LIMIT not defined 18 #endif 19 20 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT 21 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined 22 #endif 23 24 #ifndef KEXEC_CONTROL_MEMORY_LIMIT 25 #error KEXEC_CONTROL_MEMORY_LIMIT not defined 26 #endif 27 28 #ifndef KEXEC_CONTROL_PAGE_SIZE 29 #error KEXEC_CONTROL_PAGE_SIZE not defined 30 #endif 31 32 #ifndef KEXEC_ARCH 33 #error KEXEC_ARCH not defined 34 #endif 35 36 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) 37 #define KEXEC_CORE_NOTE_NAME "CORE" 38 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) 39 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) 40 /* 41 * The per-cpu notes area is a list of notes terminated by a "NULL" 42 * note header. For kdump, the code in vmcore.c runs in the context 43 * of the second kernel to combine them into one note. 44 */ 45 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ 46 KEXEC_CORE_NOTE_NAME_BYTES + \ 47 KEXEC_CORE_NOTE_DESC_BYTES ) 48 49 /* 50 * This structure is used to hold the arguments that are used when loading 51 * kernel binaries. 52 */ 53 54 typedef unsigned long kimage_entry_t; 55 #define IND_DESTINATION 0x1 56 #define IND_INDIRECTION 0x2 57 #define IND_DONE 0x4 58 #define IND_SOURCE 0x8 59 60 #define KEXEC_SEGMENT_MAX 16 61 struct kexec_segment { 62 void __user *buf; 63 size_t bufsz; 64 unsigned long mem; /* User space sees this as a (void *) ... */ 65 size_t memsz; 66 }; 67 68 #ifdef CONFIG_COMPAT 69 struct compat_kexec_segment { 70 compat_uptr_t buf; 71 compat_size_t bufsz; 72 compat_ulong_t mem; /* User space sees this as a (void *) ... */ 73 compat_size_t memsz; 74 }; 75 #endif 76 77 struct kimage { 78 kimage_entry_t head; 79 kimage_entry_t *entry; 80 kimage_entry_t *last_entry; 81 82 unsigned long destination; 83 84 unsigned long start; 85 struct page *control_code_page; 86 struct page *swap_page; 87 88 unsigned long nr_segments; 89 struct kexec_segment segment[KEXEC_SEGMENT_MAX]; 90 91 struct list_head control_pages; 92 struct list_head dest_pages; 93 struct list_head unuseable_pages; 94 95 /* Address of next control page to allocate for crash kernels. */ 96 unsigned long control_page; 97 98 /* Flags to indicate special processing */ 99 unsigned int type : 1; 100 #define KEXEC_TYPE_DEFAULT 0 101 #define KEXEC_TYPE_CRASH 1 102 unsigned int preserve_context : 1; 103 104 #ifdef ARCH_HAS_KIMAGE_ARCH 105 struct kimage_arch arch; 106 #endif 107 }; 108 109 110 111 /* kexec interface functions */ 112 extern void machine_kexec(struct kimage *image); 113 extern int machine_kexec_prepare(struct kimage *image); 114 extern void machine_kexec_cleanup(struct kimage *image); 115 extern asmlinkage long sys_kexec_load(unsigned long entry, 116 unsigned long nr_segments, 117 struct kexec_segment __user *segments, 118 unsigned long flags); 119 extern int kernel_kexec(void); 120 #ifdef CONFIG_COMPAT 121 extern asmlinkage long compat_sys_kexec_load(unsigned long entry, 122 unsigned long nr_segments, 123 struct compat_kexec_segment __user *segments, 124 unsigned long flags); 125 #endif 126 extern struct page *kimage_alloc_control_pages(struct kimage *image, 127 unsigned int order); 128 extern void crash_kexec(struct pt_regs *); 129 int kexec_should_crash(struct task_struct *); 130 void crash_save_cpu(struct pt_regs *regs, int cpu); 131 void crash_save_vmcoreinfo(void); 132 void arch_crash_save_vmcoreinfo(void); 133 void vmcoreinfo_append_str(const char *fmt, ...) 134 __attribute__ ((format (printf, 1, 2))); 135 unsigned long paddr_vmcoreinfo_note(void); 136 137 #define VMCOREINFO_OSRELEASE(value) \ 138 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 139 #define VMCOREINFO_PAGESIZE(value) \ 140 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 141 #define VMCOREINFO_SYMBOL(name) \ 142 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 143 #define VMCOREINFO_SIZE(name) \ 144 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 145 (unsigned long)sizeof(name)) 146 #define VMCOREINFO_STRUCT_SIZE(name) \ 147 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 148 (unsigned long)sizeof(struct name)) 149 #define VMCOREINFO_OFFSET(name, field) \ 150 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 151 (unsigned long)offsetof(struct name, field)) 152 #define VMCOREINFO_LENGTH(name, value) \ 153 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 154 #define VMCOREINFO_NUMBER(name) \ 155 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 156 #define VMCOREINFO_CONFIG(name) \ 157 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 158 159 extern struct kimage *kexec_image; 160 extern struct kimage *kexec_crash_image; 161 162 #ifndef kexec_flush_icache_page 163 #define kexec_flush_icache_page(page) 164 #endif 165 166 #define KEXEC_ON_CRASH 0x00000001 167 #define KEXEC_PRESERVE_CONTEXT 0x00000002 168 #define KEXEC_ARCH_MASK 0xffff0000 169 170 /* These values match the ELF architecture values. 171 * Unless there is a good reason that should continue to be the case. 172 */ 173 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 174 #define KEXEC_ARCH_386 ( 3 << 16) 175 #define KEXEC_ARCH_X86_64 (62 << 16) 176 #define KEXEC_ARCH_PPC (20 << 16) 177 #define KEXEC_ARCH_PPC64 (21 << 16) 178 #define KEXEC_ARCH_IA_64 (50 << 16) 179 #define KEXEC_ARCH_ARM (40 << 16) 180 #define KEXEC_ARCH_S390 (22 << 16) 181 #define KEXEC_ARCH_SH (42 << 16) 182 #define KEXEC_ARCH_MIPS_LE (10 << 16) 183 #define KEXEC_ARCH_MIPS ( 8 << 16) 184 185 /* List of defined/legal kexec flags */ 186 #ifndef CONFIG_KEXEC_JUMP 187 #define KEXEC_FLAGS KEXEC_ON_CRASH 188 #else 189 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) 190 #endif 191 192 #define VMCOREINFO_BYTES (4096) 193 #define VMCOREINFO_NOTE_NAME "VMCOREINFO" 194 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) 195 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ 196 + VMCOREINFO_NOTE_NAME_BYTES) 197 198 /* Location of a reserved region to hold the crash kernel. 199 */ 200 extern struct resource crashk_res; 201 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; 202 extern note_buf_t __percpu *crash_notes; 203 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; 204 extern size_t vmcoreinfo_size; 205 extern size_t vmcoreinfo_max_size; 206 207 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, 208 unsigned long long *crash_size, unsigned long long *crash_base); 209 int crash_shrink_memory(unsigned long new_size); 210 size_t crash_get_memory_size(void); 211 212 #else /* !CONFIG_KEXEC */ 213 struct pt_regs; 214 struct task_struct; 215 static inline void crash_kexec(struct pt_regs *regs) { } 216 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 217 #endif /* CONFIG_KEXEC */ 218 #endif /* LINUX_KEXEC_H */ 219