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_CODE_SIZE
  29 #error KEXEC_CONTROL_CODE_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
  87         unsigned long nr_segments;
  88         struct kexec_segment segment[KEXEC_SEGMENT_MAX];
  89
  90         struct list_head control_pages;
  91         struct list_head dest_pages;
  92         struct list_head unuseable_pages;
  93
  94         /* Address of next control page to allocate for crash kernels. */
  95         unsigned long control_page;
  96
  97         /* Flags to indicate special processing */
  98         unsigned int type : 1;
  99 #define KEXEC_TYPE_DEFAULT 0
 100 #define KEXEC_TYPE_CRASH   1
 101 };
 102
 103
 104
 105 /* kexec interface functions */
 106 extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
 107 extern int machine_kexec_prepare(struct kimage *image);
 108 extern void machine_kexec_cleanup(struct kimage *image);
 109 extern asmlinkage long sys_kexec_load(unsigned long entry,
 110                                         unsigned long nr_segments,
 111                                         struct kexec_segment __user *segments,
 112                                         unsigned long flags);
 113 #ifdef CONFIG_COMPAT
 114 extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
 115                                 unsigned long nr_segments,
 116                                 struct compat_kexec_segment __user *segments,
 117                                 unsigned long flags);
 118 #endif
 119 extern struct page *kimage_alloc_control_pages(struct kimage *image,
 120                                                 unsigned int order);
 121 extern void crash_kexec(struct pt_regs *);
 122 int kexec_should_crash(struct task_struct *);
 123 void crash_save_cpu(struct pt_regs *regs, int cpu);
 124 extern struct kimage *kexec_image;
 125 extern struct kimage *kexec_crash_image;
 126
 127 #ifndef kexec_flush_icache_page
 128 #define kexec_flush_icache_page(page)
 129 #endif
 130
 131 #define KEXEC_ON_CRASH  0x00000001
 132 #define KEXEC_ARCH_MASK 0xffff0000
 133
 134 /* These values match the ELF architecture values.
 135  * Unless there is a good reason that should continue to be the case.
 136  */
 137 #define KEXEC_ARCH_DEFAULT ( 0 << 16)
 138 #define KEXEC_ARCH_386     ( 3 << 16)
 139 #define KEXEC_ARCH_X86_64  (62 << 16)
 140 #define KEXEC_ARCH_PPC     (20 << 16)
 141 #define KEXEC_ARCH_PPC64   (21 << 16)
 142 #define KEXEC_ARCH_IA_64   (50 << 16)
 143 #define KEXEC_ARCH_ARM     (40 << 16)
 144 #define KEXEC_ARCH_S390    (22 << 16)
 145 #define KEXEC_ARCH_SH      (42 << 16)
 146 #define KEXEC_ARCH_MIPS_LE (10 << 16)
 147 #define KEXEC_ARCH_MIPS    ( 8 << 16)
 148
 149 #define KEXEC_FLAGS    (KEXEC_ON_CRASH)  /* List of defined/legal kexec flags */
 150
 151 /* Location of a reserved region to hold the crash kernel.
 152  */
 153 extern struct resource crashk_res;
 154 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
 155 extern note_buf_t *crash_notes;
 156
 157
 158 #else /* !CONFIG_KEXEC */
 159 struct pt_regs;
 160 struct task_struct;
 161 static inline void crash_kexec(struct pt_regs *regs) { }
 162 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 163 #endif /* CONFIG_KEXEC */
 164 #endif /* LINUX_KEXEC_H */