linux/include/linux/kexec.h
<<
>>
Prefs
   1#ifndef LINUX_KEXEC_H
   2#define LINUX_KEXEC_H
   3
   4/* kexec system call -  It loads the new kernel to boot into.
   5 * kexec does not sync, or unmount filesystems so if you need
   6 * that to happen you need to do that yourself.
   7 */
   8
   9#include <linux/types.h>
  10
  11/* kexec flags for different usage scenarios */
  12#define KEXEC_ON_CRASH          0x00000001
  13#define KEXEC_PRESERVE_CONTEXT  0x00000002
  14#define KEXEC_ARCH_MASK         0xffff0000
  15
  16/* These values match the ELF architecture values.
  17 * Unless there is a good reason that should continue to be the case.
  18 */
  19#define KEXEC_ARCH_DEFAULT ( 0 << 16)
  20#define KEXEC_ARCH_386     ( 3 << 16)
  21#define KEXEC_ARCH_X86_64  (62 << 16)
  22#define KEXEC_ARCH_PPC     (20 << 16)
  23#define KEXEC_ARCH_PPC64   (21 << 16)
  24#define KEXEC_ARCH_IA_64   (50 << 16)
  25#define KEXEC_ARCH_ARM     (40 << 16)
  26#define KEXEC_ARCH_S390    (22 << 16)
  27#define KEXEC_ARCH_SH      (42 << 16)
  28#define KEXEC_ARCH_MIPS_LE (10 << 16)
  29#define KEXEC_ARCH_MIPS    ( 8 << 16)
  30
  31/* The artificial cap on the number of segments passed to kexec_load. */
  32#define KEXEC_SEGMENT_MAX 16
  33
  34#ifndef __KERNEL__
  35/*
  36 * This structure is used to hold the arguments that are used when
  37 * loading  kernel binaries.
  38 */
  39struct kexec_segment {
  40        const void *buf;
  41        size_t bufsz;
  42        const void *mem;
  43        size_t memsz;
  44};
  45
  46/* Load a new kernel image as described by the kexec_segment array
  47 * consisting of passed number of segments at the entry-point address.
  48 * The flags allow different useage types.
  49 */
  50extern int kexec_load(void *, size_t, struct kexec_segment *,
  51                unsigned long int);
  52#endif /* __KERNEL__ */
  53
  54#ifdef __KERNEL__
  55#ifdef CONFIG_KEXEC
  56#include <linux/list.h>
  57#include <linux/linkage.h>
  58#include <linux/compat.h>
  59#include <linux/ioport.h>
  60#include <linux/elfcore.h>
  61#include <linux/elf.h>
  62#include <asm/kexec.h>
  63
  64/* Verify architecture specific macros are defined */
  65
  66#ifndef KEXEC_SOURCE_MEMORY_LIMIT
  67#error KEXEC_SOURCE_MEMORY_LIMIT not defined
  68#endif
  69
  70#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
  71#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
  72#endif
  73
  74#ifndef KEXEC_CONTROL_MEMORY_LIMIT
  75#error KEXEC_CONTROL_MEMORY_LIMIT not defined
  76#endif
  77
  78#ifndef KEXEC_CONTROL_PAGE_SIZE
  79#error KEXEC_CONTROL_PAGE_SIZE not defined
  80#endif
  81
  82#ifndef KEXEC_ARCH
  83#error KEXEC_ARCH not defined
  84#endif
  85
  86#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
  87#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
  88#endif
  89
  90#ifndef KEXEC_CRASH_MEM_ALIGN
  91#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
  92#endif
  93
  94#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
  95#define KEXEC_CORE_NOTE_NAME "CORE"
  96#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
  97#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
  98/*
  99 * The per-cpu notes area is a list of notes terminated by a "NULL"
 100 * note header.  For kdump, the code in vmcore.c runs in the context
 101 * of the second kernel to combine them into one note.
 102 */
 103#ifndef KEXEC_NOTE_BYTES
 104#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +                \
 105                            KEXEC_CORE_NOTE_NAME_BYTES +                \
 106                            KEXEC_CORE_NOTE_DESC_BYTES )
 107#endif
 108
 109/*
 110 * This structure is used to hold the arguments that are used when loading
 111 * kernel binaries.
 112 */
 113
 114typedef unsigned long kimage_entry_t;
 115#define IND_DESTINATION  0x1
 116#define IND_INDIRECTION  0x2
 117#define IND_DONE         0x4
 118#define IND_SOURCE       0x8
 119
 120struct kexec_segment {
 121        void __user *buf;
 122        size_t bufsz;
 123        unsigned long mem;
 124        size_t memsz;
 125};
 126
 127#ifdef CONFIG_COMPAT
 128struct compat_kexec_segment {
 129        compat_uptr_t buf;
 130        compat_size_t bufsz;
 131        compat_ulong_t mem;     /* User space sees this as a (void *) ... */
 132        compat_size_t memsz;
 133};
 134#endif
 135
 136struct kimage {
 137        kimage_entry_t head;
 138        kimage_entry_t *entry;
 139        kimage_entry_t *last_entry;
 140
 141        unsigned long destination;
 142
 143        unsigned long start;
 144        struct page *control_code_page;
 145        struct page *swap_page;
 146
 147        unsigned long nr_segments;
 148        struct kexec_segment segment[KEXEC_SEGMENT_MAX];
 149
 150        struct list_head control_pages;
 151        struct list_head dest_pages;
 152        struct list_head unuseable_pages;
 153
 154        /* Address of next control page to allocate for crash kernels. */
 155        unsigned long control_page;
 156
 157        /* Flags to indicate special processing */
 158        unsigned int type : 1;
 159#define KEXEC_TYPE_DEFAULT 0
 160#define KEXEC_TYPE_CRASH   1
 161        unsigned int preserve_context : 1;
 162
 163#ifdef ARCH_HAS_KIMAGE_ARCH
 164        struct kimage_arch arch;
 165#endif
 166};
 167
 168
 169
 170/* kexec interface functions */
 171extern void machine_kexec(struct kimage *image);
 172extern int machine_kexec_prepare(struct kimage *image);
 173extern void machine_kexec_cleanup(struct kimage *image);
 174extern asmlinkage long sys_kexec_load(unsigned long entry,
 175                                        unsigned long nr_segments,
 176                                        struct kexec_segment __user *segments,
 177                                        unsigned long flags);
 178extern int kernel_kexec(void);
 179#ifdef CONFIG_COMPAT
 180extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
 181                                unsigned long nr_segments,
 182                                struct compat_kexec_segment __user *segments,
 183                                unsigned long flags);
 184#endif
 185extern struct page *kimage_alloc_control_pages(struct kimage *image,
 186                                                unsigned int order);
 187extern void crash_kexec(struct pt_regs *);
 188int kexec_should_crash(struct task_struct *);
 189void crash_save_cpu(struct pt_regs *regs, int cpu);
 190void crash_save_vmcoreinfo(void);
 191void crash_map_reserved_pages(void);
 192void crash_unmap_reserved_pages(void);
 193void arch_crash_save_vmcoreinfo(void);
 194__printf(1, 2)
 195void vmcoreinfo_append_str(const char *fmt, ...);
 196unsigned long paddr_vmcoreinfo_note(void);
 197
 198#define VMCOREINFO_OSRELEASE(value) \
 199        vmcoreinfo_append_str("OSRELEASE=%s\n", value)
 200#define VMCOREINFO_PAGESIZE(value) \
 201        vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
 202#define VMCOREINFO_SYMBOL(name) \
 203        vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
 204#define VMCOREINFO_SIZE(name) \
 205        vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
 206                              (unsigned long)sizeof(name))
 207#define VMCOREINFO_STRUCT_SIZE(name) \
 208        vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
 209                              (unsigned long)sizeof(struct name))
 210#define VMCOREINFO_OFFSET(name, field) \
 211        vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
 212                              (unsigned long)offsetof(struct name, field))
 213#define VMCOREINFO_LENGTH(name, value) \
 214        vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
 215#define VMCOREINFO_NUMBER(name) \
 216        vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
 217#define VMCOREINFO_CONFIG(name) \
 218        vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
 219
 220extern struct kimage *kexec_image;
 221extern struct kimage *kexec_crash_image;
 222
 223#ifndef kexec_flush_icache_page
 224#define kexec_flush_icache_page(page)
 225#endif
 226
 227/* List of defined/legal kexec flags */
 228#ifndef CONFIG_KEXEC_JUMP
 229#define KEXEC_FLAGS    KEXEC_ON_CRASH
 230#else
 231#define KEXEC_FLAGS    (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
 232#endif
 233
 234#define VMCOREINFO_BYTES           (4096)
 235#define VMCOREINFO_NOTE_NAME       "VMCOREINFO"
 236#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
 237#define VMCOREINFO_NOTE_SIZE       (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
 238                                    + VMCOREINFO_NOTE_NAME_BYTES)
 239
 240/* Location of a reserved region to hold the crash kernel.
 241 */
 242extern struct resource crashk_res;
 243typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
 244extern note_buf_t __percpu *crash_notes;
 245extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 246extern size_t vmcoreinfo_size;
 247extern size_t vmcoreinfo_max_size;
 248
 249int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
 250                unsigned long long *crash_size, unsigned long long *crash_base);
 251int crash_shrink_memory(unsigned long new_size);
 252size_t crash_get_memory_size(void);
 253void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
 254
 255#else /* !CONFIG_KEXEC */
 256struct pt_regs;
 257struct task_struct;
 258static inline void crash_kexec(struct pt_regs *regs) { }
 259static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 260#endif /* CONFIG_KEXEC */
 261#endif /* __KERNEL__ */
 262#endif /* LINUX_KEXEC_H */
 263
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.