345 lines
10 KiB
C
345 lines
10 KiB
C
#ifndef LINUX_KEXEC_H
|
|
#define LINUX_KEXEC_H
|
|
|
|
#define IND_DESTINATION_BIT 0
|
|
#define IND_INDIRECTION_BIT 1
|
|
#define IND_DONE_BIT 2
|
|
#define IND_SOURCE_BIT 3
|
|
|
|
#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
|
|
#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
|
|
#define IND_DONE (1 << IND_DONE_BIT)
|
|
#define IND_SOURCE (1 << IND_SOURCE_BIT)
|
|
#define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
|
|
|
|
#if !defined(__ASSEMBLY__)
|
|
|
|
#include <uapi/linux/kexec.h>
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
#include <linux/list.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/elfcore.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/module.h>
|
|
#include <asm/kexec.h>
|
|
|
|
/* Verify architecture specific macros are defined */
|
|
|
|
#ifndef KEXEC_SOURCE_MEMORY_LIMIT
|
|
#error KEXEC_SOURCE_MEMORY_LIMIT not defined
|
|
#endif
|
|
|
|
#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
|
|
#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
|
|
#endif
|
|
|
|
#ifndef KEXEC_CONTROL_MEMORY_LIMIT
|
|
#error KEXEC_CONTROL_MEMORY_LIMIT not defined
|
|
#endif
|
|
|
|
#ifndef KEXEC_CONTROL_MEMORY_GFP
|
|
#define KEXEC_CONTROL_MEMORY_GFP GFP_KERNEL
|
|
#endif
|
|
|
|
#ifndef KEXEC_CONTROL_PAGE_SIZE
|
|
#error KEXEC_CONTROL_PAGE_SIZE not defined
|
|
#endif
|
|
|
|
#ifndef KEXEC_ARCH
|
|
#error KEXEC_ARCH not defined
|
|
#endif
|
|
|
|
#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
|
|
#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
|
|
#endif
|
|
|
|
#ifndef KEXEC_CRASH_MEM_ALIGN
|
|
#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
|
|
#endif
|
|
|
|
#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
|
|
#define KEXEC_CORE_NOTE_NAME "CORE"
|
|
#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
|
|
#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
|
|
/*
|
|
* The per-cpu notes area is a list of notes terminated by a "NULL"
|
|
* note header. For kdump, the code in vmcore.c runs in the context
|
|
* of the second kernel to combine them into one note.
|
|
*/
|
|
#ifndef KEXEC_NOTE_BYTES
|
|
#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
|
|
KEXEC_CORE_NOTE_NAME_BYTES + \
|
|
KEXEC_CORE_NOTE_DESC_BYTES )
|
|
#endif
|
|
|
|
/*
|
|
* This structure is used to hold the arguments that are used when loading
|
|
* kernel binaries.
|
|
*/
|
|
|
|
typedef unsigned long kimage_entry_t;
|
|
|
|
struct kexec_segment {
|
|
/*
|
|
* This pointer can point to user memory if kexec_load() system
|
|
* call is used or will point to kernel memory if
|
|
* kexec_file_load() system call is used.
|
|
*
|
|
* Use ->buf when expecting to deal with user memory and use ->kbuf
|
|
* when expecting to deal with kernel memory.
|
|
*/
|
|
union {
|
|
void __user *buf;
|
|
void *kbuf;
|
|
};
|
|
size_t bufsz;
|
|
unsigned long mem;
|
|
size_t memsz;
|
|
};
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_kexec_segment {
|
|
compat_uptr_t buf;
|
|
compat_size_t bufsz;
|
|
compat_ulong_t mem; /* User space sees this as a (void *) ... */
|
|
compat_size_t memsz;
|
|
};
|
|
#endif
|
|
|
|
struct kexec_sha_region {
|
|
unsigned long start;
|
|
unsigned long len;
|
|
};
|
|
|
|
struct purgatory_info {
|
|
/* Pointer to elf header of read only purgatory */
|
|
Elf_Ehdr *ehdr;
|
|
|
|
/* Pointer to purgatory sechdrs which are modifiable */
|
|
Elf_Shdr *sechdrs;
|
|
/*
|
|
* Temporary buffer location where purgatory is loaded and relocated
|
|
* This memory can be freed post image load
|
|
*/
|
|
void *purgatory_buf;
|
|
|
|
/* Address where purgatory is finally loaded and is executed from */
|
|
unsigned long purgatory_load_addr;
|
|
};
|
|
|
|
struct kimage {
|
|
kimage_entry_t head;
|
|
kimage_entry_t *entry;
|
|
kimage_entry_t *last_entry;
|
|
|
|
unsigned long start;
|
|
struct page *control_code_page;
|
|
struct page *swap_page;
|
|
|
|
unsigned long nr_segments;
|
|
struct kexec_segment segment[KEXEC_SEGMENT_MAX];
|
|
|
|
struct list_head control_pages;
|
|
struct list_head dest_pages;
|
|
struct list_head unusable_pages;
|
|
|
|
/* Address of next control page to allocate for crash kernels. */
|
|
unsigned long control_page;
|
|
|
|
/* Flags to indicate special processing */
|
|
unsigned int type : 1;
|
|
#define KEXEC_TYPE_DEFAULT 0
|
|
#define KEXEC_TYPE_CRASH 1
|
|
unsigned int preserve_context : 1;
|
|
/* If set, we are using file mode kexec syscall */
|
|
unsigned int file_mode:1;
|
|
|
|
#ifdef ARCH_HAS_KIMAGE_ARCH
|
|
struct kimage_arch arch;
|
|
#endif
|
|
|
|
/* Additional fields for file based kexec syscall */
|
|
void *kernel_buf;
|
|
unsigned long kernel_buf_len;
|
|
|
|
void *initrd_buf;
|
|
unsigned long initrd_buf_len;
|
|
|
|
char *cmdline_buf;
|
|
unsigned long cmdline_buf_len;
|
|
|
|
/* File operations provided by image loader */
|
|
struct kexec_file_ops *fops;
|
|
|
|
/* Image loader handling the kernel can store a pointer here */
|
|
void *image_loader_data;
|
|
|
|
/* Information for loading purgatory */
|
|
struct purgatory_info purgatory_info;
|
|
};
|
|
|
|
/*
|
|
* Keeps track of buffer parameters as provided by caller for requesting
|
|
* memory placement of buffer.
|
|
*/
|
|
struct kexec_buf {
|
|
struct kimage *image;
|
|
char *buffer;
|
|
unsigned long bufsz;
|
|
unsigned long mem;
|
|
unsigned long memsz;
|
|
unsigned long buf_align;
|
|
unsigned long buf_min;
|
|
unsigned long buf_max;
|
|
bool top_down; /* allocate from top of memory hole */
|
|
};
|
|
|
|
typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
|
|
typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
|
|
unsigned long kernel_len, char *initrd,
|
|
unsigned long initrd_len, char *cmdline,
|
|
unsigned long cmdline_len);
|
|
typedef int (kexec_cleanup_t)(void *loader_data);
|
|
typedef int (kexec_verify_sig_t)(const char *kernel_buf,
|
|
unsigned long kernel_len);
|
|
|
|
struct kexec_file_ops {
|
|
kexec_probe_t *probe;
|
|
kexec_load_t *load;
|
|
kexec_cleanup_t *cleanup;
|
|
kexec_verify_sig_t *verify_sig;
|
|
};
|
|
|
|
/* kexec interface functions */
|
|
extern void machine_kexec(struct kimage *image);
|
|
extern int machine_kexec_prepare(struct kimage *image);
|
|
extern void machine_kexec_cleanup(struct kimage *image);
|
|
extern asmlinkage long sys_kexec_load(unsigned long entry,
|
|
unsigned long nr_segments,
|
|
struct kexec_segment __user *segments,
|
|
unsigned long flags);
|
|
extern int kernel_kexec(void);
|
|
extern int kexec_add_buffer(struct kimage *image, char *buffer,
|
|
unsigned long bufsz, unsigned long memsz,
|
|
unsigned long buf_align, unsigned long buf_min,
|
|
unsigned long buf_max, bool top_down,
|
|
unsigned long *load_addr);
|
|
extern struct page *kimage_alloc_control_pages(struct kimage *image,
|
|
unsigned int order);
|
|
extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
|
|
unsigned long max, int top_down,
|
|
unsigned long *load_addr);
|
|
extern int kexec_purgatory_get_set_symbol(struct kimage *image,
|
|
const char *name, void *buf,
|
|
unsigned int size, bool get_value);
|
|
extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
|
|
const char *name);
|
|
extern void __crash_kexec(struct pt_regs *);
|
|
extern void crash_kexec(struct pt_regs *);
|
|
int kexec_should_crash(struct task_struct *);
|
|
void crash_save_cpu(struct pt_regs *regs, int cpu);
|
|
void crash_save_vmcoreinfo(void);
|
|
void crash_map_reserved_pages(void);
|
|
void crash_unmap_reserved_pages(void);
|
|
void arch_crash_save_vmcoreinfo(void);
|
|
__printf(1, 2)
|
|
void vmcoreinfo_append_str(const char *fmt, ...);
|
|
unsigned long paddr_vmcoreinfo_note(void);
|
|
|
|
#define VMCOREINFO_OSRELEASE(value) \
|
|
vmcoreinfo_append_str("OSRELEASE=%s\n", value)
|
|
#define VMCOREINFO_PAGESIZE(value) \
|
|
vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
|
|
#define VMCOREINFO_SYMBOL(name) \
|
|
vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
|
|
#define VMCOREINFO_SIZE(name) \
|
|
vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
|
|
(unsigned long)sizeof(name))
|
|
#define VMCOREINFO_STRUCT_SIZE(name) \
|
|
vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
|
|
(unsigned long)sizeof(struct name))
|
|
#define VMCOREINFO_OFFSET(name, field) \
|
|
vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
|
|
(unsigned long)offsetof(struct name, field))
|
|
#define VMCOREINFO_LENGTH(name, value) \
|
|
vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
|
|
#define VMCOREINFO_NUMBER(name) \
|
|
vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
|
|
#define VMCOREINFO_CONFIG(name) \
|
|
vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
|
|
|
|
extern struct kimage *kexec_image;
|
|
extern struct kimage *kexec_crash_image;
|
|
extern int kexec_load_disabled;
|
|
|
|
#ifndef kexec_flush_icache_page
|
|
#define kexec_flush_icache_page(page)
|
|
#endif
|
|
|
|
/* List of defined/legal kexec flags */
|
|
#ifndef CONFIG_KEXEC_JUMP
|
|
#define KEXEC_FLAGS KEXEC_ON_CRASH
|
|
#else
|
|
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
|
|
#endif
|
|
|
|
/* List of defined/legal kexec file flags */
|
|
#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
|
|
KEXEC_FILE_NO_INITRAMFS)
|
|
|
|
#define VMCOREINFO_BYTES (4096)
|
|
#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
|
|
#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
|
|
#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
|
|
+ VMCOREINFO_NOTE_NAME_BYTES)
|
|
|
|
/* Location of a reserved region to hold the crash kernel.
|
|
*/
|
|
extern struct resource crashk_res;
|
|
extern struct resource crashk_low_res;
|
|
typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
|
|
extern note_buf_t __percpu *crash_notes;
|
|
extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
|
|
extern size_t vmcoreinfo_size;
|
|
extern size_t vmcoreinfo_max_size;
|
|
|
|
/* flag to track if kexec reboot is in progress */
|
|
extern bool kexec_in_progress;
|
|
|
|
int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
|
|
unsigned long long *crash_size, unsigned long long *crash_base);
|
|
int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
|
|
unsigned long long *crash_size, unsigned long long *crash_base);
|
|
int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
|
|
unsigned long long *crash_size, unsigned long long *crash_base);
|
|
int crash_shrink_memory(unsigned long new_size);
|
|
size_t crash_get_memory_size(void);
|
|
void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
|
|
|
|
int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
|
|
unsigned long buf_len);
|
|
void * __weak arch_kexec_kernel_image_load(struct kimage *image);
|
|
int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
|
|
int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
|
|
unsigned long buf_len);
|
|
int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
|
|
Elf_Shdr *sechdrs, unsigned int relsec);
|
|
int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
|
|
unsigned int relsec);
|
|
|
|
#else /* !CONFIG_KEXEC_CORE */
|
|
struct pt_regs;
|
|
struct task_struct;
|
|
static inline void __crash_kexec(struct pt_regs *regs) { }
|
|
static inline void crash_kexec(struct pt_regs *regs) { }
|
|
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
|
|
#define kexec_in_progress false
|
|
#endif /* CONFIG_KEXEC_CORE */
|
|
|
|
#endif /* !defined(__ASSEBMLY__) */
|
|
|
|
#endif /* LINUX_KEXEC_H */
|