include/linux/kexec.h

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