222 lines
6.6 KiB
C
222 lines
6.6 KiB
C
#ifndef LINUX_KEXEC_H
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#define LINUX_KEXEC_H
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#include <uapi/linux/kexec.h>
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#ifdef CONFIG_KEXEC
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#include <linux/list.h>
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#include <linux/linkage.h>
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#include <linux/compat.h>
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#include <linux/ioport.h>
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#include <linux/elfcore.h>
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#include <linux/elf.h>
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#include <asm/kexec.h>
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/* Verify architecture specific macros are defined */
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#ifndef KEXEC_SOURCE_MEMORY_LIMIT
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#error KEXEC_SOURCE_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
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#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_LIMIT
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#error KEXEC_CONTROL_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_PAGE_SIZE
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#error KEXEC_CONTROL_PAGE_SIZE not defined
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#endif
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#ifndef KEXEC_ARCH
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#error KEXEC_ARCH not defined
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#endif
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#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
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#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
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#endif
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#ifndef KEXEC_CRASH_MEM_ALIGN
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#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
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#endif
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#define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
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#define KEXEC_CORE_NOTE_NAME "CORE"
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#define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
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#define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
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/*
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* The per-cpu notes area is a list of notes terminated by a "NULL"
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* note header. For kdump, the code in vmcore.c runs in the context
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* of the second kernel to combine them into one note.
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*/
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#ifndef KEXEC_NOTE_BYTES
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#define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
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KEXEC_CORE_NOTE_NAME_BYTES + \
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KEXEC_CORE_NOTE_DESC_BYTES )
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#endif
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/*
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* This structure is used to hold the arguments that are used when loading
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* kernel binaries.
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*/
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typedef unsigned long kimage_entry_t;
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#define IND_DESTINATION 0x1
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#define IND_INDIRECTION 0x2
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#define IND_DONE 0x4
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#define IND_SOURCE 0x8
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struct kexec_segment {
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void __user *buf;
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size_t bufsz;
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unsigned long mem;
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size_t memsz;
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};
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#ifdef CONFIG_COMPAT
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struct compat_kexec_segment {
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compat_uptr_t buf;
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compat_size_t bufsz;
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compat_ulong_t mem; /* User space sees this as a (void *) ... */
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compat_size_t memsz;
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};
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#endif
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struct kimage {
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kimage_entry_t head;
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kimage_entry_t *entry;
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kimage_entry_t *last_entry;
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unsigned long destination;
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unsigned long start;
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struct page *control_code_page;
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struct page *swap_page;
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unsigned long nr_segments;
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struct kexec_segment segment[KEXEC_SEGMENT_MAX];
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struct list_head control_pages;
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struct list_head dest_pages;
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struct list_head unuseable_pages;
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/* Address of next control page to allocate for crash kernels. */
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unsigned long control_page;
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/* Flags to indicate special processing */
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unsigned int type : 1;
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#define KEXEC_TYPE_DEFAULT 0
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#define KEXEC_TYPE_CRASH 1
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unsigned int preserve_context : 1;
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#ifdef ARCH_HAS_KIMAGE_ARCH
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struct kimage_arch arch;
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#endif
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};
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/* kexec interface functions */
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extern void machine_kexec(struct kimage *image);
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extern int machine_kexec_prepare(struct kimage *image);
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extern void machine_kexec_cleanup(struct kimage *image);
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extern asmlinkage long sys_kexec_load(unsigned long entry,
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unsigned long nr_segments,
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struct kexec_segment __user *segments,
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unsigned long flags);
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extern int kernel_kexec(void);
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#ifdef CONFIG_COMPAT
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extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
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unsigned long nr_segments,
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struct compat_kexec_segment __user *segments,
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unsigned long flags);
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#endif
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extern struct page *kimage_alloc_control_pages(struct kimage *image,
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unsigned int order);
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extern void crash_kexec(struct pt_regs *);
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int kexec_should_crash(struct task_struct *);
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void crash_save_cpu(struct pt_regs *regs, int cpu);
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void crash_save_vmcoreinfo(void);
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void crash_map_reserved_pages(void);
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void crash_unmap_reserved_pages(void);
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void arch_crash_save_vmcoreinfo(void);
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__printf(1, 2)
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void vmcoreinfo_append_str(const char *fmt, ...);
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unsigned long paddr_vmcoreinfo_note(void);
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#define VMCOREINFO_OSRELEASE(value) \
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vmcoreinfo_append_str("OSRELEASE=%s\n", value)
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#define VMCOREINFO_PAGESIZE(value) \
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vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
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#define VMCOREINFO_SYMBOL(name) \
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vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
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#define VMCOREINFO_SIZE(name) \
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vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
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(unsigned long)sizeof(name))
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#define VMCOREINFO_STRUCT_SIZE(name) \
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vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
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(unsigned long)sizeof(struct name))
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#define VMCOREINFO_OFFSET(name, field) \
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vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
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(unsigned long)offsetof(struct name, field))
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#define VMCOREINFO_LENGTH(name, value) \
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vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
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#define VMCOREINFO_NUMBER(name) \
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vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
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#define VMCOREINFO_CONFIG(name) \
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vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
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extern struct kimage *kexec_image;
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extern struct kimage *kexec_crash_image;
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extern int kexec_load_disabled;
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#ifndef kexec_flush_icache_page
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#define kexec_flush_icache_page(page)
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#endif
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/* List of defined/legal kexec flags */
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#ifndef CONFIG_KEXEC_JUMP
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#define KEXEC_FLAGS KEXEC_ON_CRASH
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#else
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#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
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#endif
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#define VMCOREINFO_BYTES (4096)
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#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
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#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
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#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
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+ VMCOREINFO_NOTE_NAME_BYTES)
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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extern struct resource crashk_low_res;
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typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
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extern note_buf_t __percpu *crash_notes;
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extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
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extern size_t vmcoreinfo_size;
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extern size_t vmcoreinfo_max_size;
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/* flag to track if kexec reboot is in progress */
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extern bool kexec_in_progress;
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int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
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unsigned long long *crash_size, unsigned long long *crash_base);
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int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
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unsigned long long *crash_size, unsigned long long *crash_base);
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int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
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unsigned long long *crash_size, unsigned long long *crash_base);
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int crash_shrink_memory(unsigned long new_size);
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size_t crash_get_memory_size(void);
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void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
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#else /* !CONFIG_KEXEC */
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struct pt_regs;
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struct task_struct;
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static inline void crash_kexec(struct pt_regs *regs) { }
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static inline int kexec_should_crash(struct task_struct *p) { return 0; }
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#endif /* CONFIG_KEXEC */
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#endif /* LINUX_KEXEC_H */
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