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 }; 104 105 106 107 /* kexec interface functions */ 108 extern void machine_kexec(struct kimage *image); 109 extern int machine_kexec_prepare(struct kimage *image); 110 extern void machine_kexec_cleanup(struct kimage *image); 111 extern asmlinkage long sys_kexec_load(unsigned long entry, 112 unsigned long nr_segments, 113 struct kexec_segment __user *segments, 114 unsigned long flags); 115 extern int kernel_kexec(void); 116 #ifdef CONFIG_COMPAT 117 extern asmlinkage long compat_sys_kexec_load(unsigned long entry, 118 unsigned long nr_segments, 119 struct compat_kexec_segment __user *segments, 120 unsigned long flags); 121 #endif 122 extern struct page *kimage_alloc_control_pages(struct kimage *image, 123 unsigned int order); 124 extern void crash_kexec(struct pt_regs *); 125 int kexec_should_crash(struct task_struct *); 126 void crash_save_cpu(struct pt_regs *regs, int cpu); 127 void crash_save_vmcoreinfo(void); 128 void arch_crash_save_vmcoreinfo(void); 129 void vmcoreinfo_append_str(const char *fmt, ...) 130 __attribute__ ((format (printf, 1, 2))); 131 unsigned long paddr_vmcoreinfo_note(void); 132 133 #define VMCOREINFO_OSRELEASE(value) \ 134 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 135 #define VMCOREINFO_PAGESIZE(value) \ 136 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 137 #define VMCOREINFO_SYMBOL(name) \ 138 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 139 #define VMCOREINFO_SIZE(name) \ 140 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 141 (unsigned long)sizeof(name)) 142 #define VMCOREINFO_STRUCT_SIZE(name) \ 143 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 144 (unsigned long)sizeof(struct name)) 145 #define VMCOREINFO_OFFSET(name, field) \ 146 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 147 (unsigned long)offsetof(struct name, field)) 148 #define VMCOREINFO_LENGTH(name, value) \ 149 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 150 #define VMCOREINFO_NUMBER(name) \ 151 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 152 #define VMCOREINFO_CONFIG(name) \ 153 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 154 155 extern struct kimage *kexec_image; 156 extern struct kimage *kexec_crash_image; 157 158 #ifndef kexec_flush_icache_page 159 #define kexec_flush_icache_page(page) 160 #endif 161 162 #define KEXEC_ON_CRASH 0x00000001 163 #define KEXEC_PRESERVE_CONTEXT 0x00000002 164 #define KEXEC_ARCH_MASK 0xffff0000 165 166 /* These values match the ELF architecture values. 167 * Unless there is a good reason that should continue to be the case. 168 */ 169 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 170 #define KEXEC_ARCH_386 ( 3 << 16) 171 #define KEXEC_ARCH_X86_64 (62 << 16) 172 #define KEXEC_ARCH_PPC (20 << 16) 173 #define KEXEC_ARCH_PPC64 (21 << 16) 174 #define KEXEC_ARCH_IA_64 (50 << 16) 175 #define KEXEC_ARCH_ARM (40 << 16) 176 #define KEXEC_ARCH_S390 (22 << 16) 177 #define KEXEC_ARCH_SH (42 << 16) 178 #define KEXEC_ARCH_MIPS_LE (10 << 16) 179 #define KEXEC_ARCH_MIPS ( 8 << 16) 180 181 /* List of defined/legal kexec flags */ 182 #ifndef CONFIG_KEXEC_JUMP 183 #define KEXEC_FLAGS KEXEC_ON_CRASH 184 #else 185 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) 186 #endif 187 188 #define VMCOREINFO_BYTES (4096) 189 #define VMCOREINFO_NOTE_NAME "VMCOREINFO" 190 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) 191 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ 192 + VMCOREINFO_NOTE_NAME_BYTES) 193 194 /* Location of a reserved region to hold the crash kernel. 195 */ 196 extern struct resource crashk_res; 197 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; 198 extern note_buf_t *crash_notes; 199 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; 200 extern size_t vmcoreinfo_size; 201 extern size_t vmcoreinfo_max_size; 202 203 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, 204 unsigned long long *crash_size, unsigned long long *crash_base); 205 206 #else /* !CONFIG_KEXEC */ 207 struct pt_regs; 208 struct task_struct; 209 static inline void crash_kexec(struct pt_regs *regs) { } 210 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 211 #endif /* CONFIG_KEXEC */ 212 #endif /* LINUX_KEXEC_H */ 213