linux/include/linux/kexec.h
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   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
  65typedef 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
  71struct kexec_segment {
  72        void __user *buf;
  73        size_t bufsz;
  74        unsigned long mem;
  75        size_t memsz;
  76};
  77
  78#ifdef CONFIG_COMPAT
  79struct 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
  87struct 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 */
 122extern void machine_kexec(struct kimage *image);
 123extern int machine_kexec_prepare(struct kimage *image);
 124extern void machine_kexec_cleanup(struct kimage *image);
 125extern asmlinkage long sys_kexec_load(unsigned long entry,
 126                                        unsigned long nr_segments,
 127                                        struct kexec_segment __user *segments,
 128                                        unsigned long flags);
 129extern int kernel_kexec(void);
 130#ifdef CONFIG_COMPAT
 131extern 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
 136extern struct page *kimage_alloc_control_pages(struct kimage *image,
 137                                                unsigned int order);
 138extern void crash_kexec(struct pt_regs *);
 139int kexec_should_crash(struct task_struct *);
 140void crash_save_cpu(struct pt_regs *regs, int cpu);
 141void crash_save_vmcoreinfo(void);
 142void crash_map_reserved_pages(void);
 143void crash_unmap_reserved_pages(void);
 144void arch_crash_save_vmcoreinfo(void);
 145__printf(1, 2)
 146void vmcoreinfo_append_str(const char *fmt, ...);
 147unsigned 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
 171extern struct kimage *kexec_image;
 172extern 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 */
 193extern struct resource crashk_res;
 194typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
 195extern note_buf_t __percpu *crash_notes;
 196extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 197extern size_t vmcoreinfo_size;
 198extern size_t vmcoreinfo_max_size;
 199
 200int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
 201                unsigned long long *crash_size, unsigned long long *crash_base);
 202int crash_shrink_memory(unsigned long new_size);
 203size_t crash_get_memory_size(void);
 204void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
 205
 206#else /* !CONFIG_KEXEC */
 207struct pt_regs;
 208struct task_struct;
 209static inline void crash_kexec(struct pt_regs *regs) { }
 210static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 211#endif /* CONFIG_KEXEC */
 212#endif /* LINUX_KEXEC_H */
 213
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