include/linux/kexec.h

   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 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
  37 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
  38 #endif
  39
  40 #ifndef KEXEC_CRASH_MEM_ALIGN
  41 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
  42 #endif
  43
  44 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
  45 #define KEXEC_CORE_NOTE_NAME "CORE"
  46 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
  47 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
  48 /*
  49  * The per-cpu notes area is a list of notes terminated by a "NULL"
  50  * note header.  For kdump, the code in vmcore.c runs in the context
  51  * of the second kernel to combine them into one note.
  52  */
  53 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +                \
  54                             KEXEC_CORE_NOTE_NAME_BYTES +                \
  55                             KEXEC_CORE_NOTE_DESC_BYTES )
  56
  57 /*
  58  * This structure is used to hold the arguments that are used when loading
  59  * kernel binaries.
  60  */
  61
  62 typedef unsigned long kimage_entry_t;
  63 #define IND_DESTINATION  0x1
  64 #define IND_INDIRECTION  0x2
  65 #define IND_DONE         0x4
  66 #define IND_SOURCE       0x8
  67
  68 #define KEXEC_SEGMENT_MAX 16
  69 struct kexec_segment {
  70         void __user *buf;
  71         size_t bufsz;
  72         unsigned long mem;      /* User space sees this as a (void *) ... */
  73         size_t memsz;
  74 };
  75
  76 #ifdef CONFIG_COMPAT
  77 struct compat_kexec_segment {
  78         compat_uptr_t buf;
  79         compat_size_t bufsz;
  80         compat_ulong_t mem;     /* User space sees this as a (void *) ... */
  81         compat_size_t memsz;
  82 };
  83 #endif
  84
  85 struct kimage {
  86         kimage_entry_t head;
  87         kimage_entry_t *entry;
  88         kimage_entry_t *last_entry;
  89
  90         unsigned long destination;
  91
  92         unsigned long start;
  93         struct page *control_code_page;
  94         struct page *swap_page;
  95
  96         unsigned long nr_segments;
  97         struct kexec_segment segment[KEXEC_SEGMENT_MAX];
  98
  99         struct list_head control_pages;
 100         struct list_head dest_pages;
 101         struct list_head unuseable_pages;
 102
 103         /* Address of next control page to allocate for crash kernels. */
 104         unsigned long control_page;
 105
 106         /* Flags to indicate special processing */
 107         unsigned int type : 1;
 108 #define KEXEC_TYPE_DEFAULT 0
 109 #define KEXEC_TYPE_CRASH   1
 110         unsigned int preserve_context : 1;
 111
 112 #ifdef ARCH_HAS_KIMAGE_ARCH
 113         struct kimage_arch arch;
 114 #endif
 115 };
 116
 117
 118
 119 /* kexec interface functions */
 120 extern void machine_kexec(struct kimage *image);
 121 extern int machine_kexec_prepare(struct kimage *image);
 122 extern void machine_kexec_cleanup(struct kimage *image);
 123 extern asmlinkage long sys_kexec_load(unsigned long entry,
 124                                         unsigned long nr_segments,
 125                                         struct kexec_segment __user *segments,
 126                                         unsigned long flags);
 127 extern int kernel_kexec(void);
 128 #ifdef CONFIG_COMPAT
 129 extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
 130                                 unsigned long nr_segments,
 131                                 struct compat_kexec_segment __user *segments,
 132                                 unsigned long flags);
 133 #endif
 134 extern struct page *kimage_alloc_control_pages(struct kimage *image,
 135                                                 unsigned int order);
 136 extern void crash_kexec(struct pt_regs *);
 137 int kexec_should_crash(struct task_struct *);
 138 void crash_save_cpu(struct pt_regs *regs, int cpu);
 139 void crash_save_vmcoreinfo(void);
 140 void crash_map_reserved_pages(void);
 141 void crash_unmap_reserved_pages(void);
 142 void arch_crash_save_vmcoreinfo(void);
 143 __printf(1, 2)
 144 void vmcoreinfo_append_str(const char *fmt, ...);
 145 unsigned long paddr_vmcoreinfo_note(void);
 146
 147 #define VMCOREINFO_OSRELEASE(value) \
 148         vmcoreinfo_append_str("OSRELEASE=%s\n", value)
 149 #define VMCOREINFO_PAGESIZE(value) \
 150         vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
 151 #define VMCOREINFO_SYMBOL(name) \
 152         vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
 153 #define VMCOREINFO_SIZE(name) \
 154         vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
 155                               (unsigned long)sizeof(name))
 156 #define VMCOREINFO_STRUCT_SIZE(name) \
 157         vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
 158                               (unsigned long)sizeof(struct name))
 159 #define VMCOREINFO_OFFSET(name, field) \
 160         vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
 161                               (unsigned long)offsetof(struct name, field))
 162 #define VMCOREINFO_LENGTH(name, value) \
 163         vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
 164 #define VMCOREINFO_NUMBER(name) \
 165         vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
 166 #define VMCOREINFO_CONFIG(name) \
 167         vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
 168
 169 extern struct kimage *kexec_image;
 170 extern struct kimage *kexec_crash_image;
 171
 172 #ifndef kexec_flush_icache_page
 173 #define kexec_flush_icache_page(page)
 174 #endif
 175
 176 #define KEXEC_ON_CRASH          0x00000001
 177 #define KEXEC_PRESERVE_CONTEXT  0x00000002
 178 #define KEXEC_ARCH_MASK         0xffff0000
 179
 180 /* These values match the ELF architecture values.
 181  * Unless there is a good reason that should continue to be the case.
 182  */
 183 #define KEXEC_ARCH_DEFAULT ( 0 << 16)
 184 #define KEXEC_ARCH_386     ( 3 << 16)
 185 #define KEXEC_ARCH_X86_64  (62 << 16)
 186 #define KEXEC_ARCH_PPC     (20 << 16)
 187 #define KEXEC_ARCH_PPC64   (21 << 16)
 188 #define KEXEC_ARCH_IA_64   (50 << 16)
 189 #define KEXEC_ARCH_ARM     (40 << 16)
 190 #define KEXEC_ARCH_S390    (22 << 16)
 191 #define KEXEC_ARCH_SH      (42 << 16)
 192 #define KEXEC_ARCH_MIPS_LE (10 << 16)
 193 #define KEXEC_ARCH_MIPS    ( 8 << 16)
 194
 195 /* List of defined/legal kexec flags */
 196 #ifndef CONFIG_KEXEC_JUMP
 197 #define KEXEC_FLAGS    KEXEC_ON_CRASH
 198 #else
 199 #define KEXEC_FLAGS    (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
 200 #endif
 201
 202 #define VMCOREINFO_BYTES           (4096)
 203 #define VMCOREINFO_NOTE_NAME       "VMCOREINFO"
 204 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
 205 #define VMCOREINFO_NOTE_SIZE       (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
 206                                     + VMCOREINFO_NOTE_NAME_BYTES)
 207
 208 /* Location of a reserved region to hold the crash kernel.
 209  */
 210 extern struct resource crashk_res;
 211 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
 212 extern note_buf_t __percpu *crash_notes;
 213 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 214 extern size_t vmcoreinfo_size;
 215 extern size_t vmcoreinfo_max_size;
 216
 217 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
 218                 unsigned long long *crash_size, unsigned long long *crash_base);
 219 int crash_shrink_memory(unsigned long new_size);
 220 size_t crash_get_memory_size(void);
 221 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
 222
 223 #else /* !CONFIG_KEXEC */
 224 struct pt_regs;
 225 struct task_struct;
 226 static inline void crash_kexec(struct pt_regs *regs) { }
 227 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 228 #endif /* CONFIG_KEXEC */
 229 #endif /* LINUX_KEXEC_H */