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380 lines
11 KiB
380 lines
11 KiB
#ifndef LINUX_KEXEC_H |
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#define LINUX_KEXEC_H |
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#define IND_DESTINATION_BIT 0 |
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#define IND_INDIRECTION_BIT 1 |
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#define IND_DONE_BIT 2 |
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#define IND_SOURCE_BIT 3 |
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#define IND_DESTINATION (1 << IND_DESTINATION_BIT) |
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#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT) |
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#define IND_DONE (1 << IND_DONE_BIT) |
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#define IND_SOURCE (1 << IND_SOURCE_BIT) |
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#define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE) |
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#if !defined(__ASSEMBLY__) |
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#include <asm/io.h> |
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#include <uapi/linux/kexec.h> |
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#ifdef CONFIG_KEXEC_CORE |
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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 <linux/module.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_MEMORY_GFP |
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#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY) |
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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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struct kexec_segment { |
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/* |
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* This pointer can point to user memory if kexec_load() system |
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* call is used or will point to kernel memory if |
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* kexec_file_load() system call is used. |
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* |
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* Use ->buf when expecting to deal with user memory and use ->kbuf |
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* when expecting to deal with kernel memory. |
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*/ |
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union { |
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void __user *buf; |
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void *kbuf; |
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}; |
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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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#ifdef CONFIG_KEXEC_FILE |
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struct purgatory_info { |
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/* Pointer to elf header of read only purgatory */ |
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Elf_Ehdr *ehdr; |
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/* Pointer to purgatory sechdrs which are modifiable */ |
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Elf_Shdr *sechdrs; |
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/* |
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* Temporary buffer location where purgatory is loaded and relocated |
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* This memory can be freed post image load |
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*/ |
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void *purgatory_buf; |
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/* Address where purgatory is finally loaded and is executed from */ |
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unsigned long purgatory_load_addr; |
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}; |
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typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size); |
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typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf, |
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unsigned long kernel_len, char *initrd, |
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unsigned long initrd_len, char *cmdline, |
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unsigned long cmdline_len); |
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typedef int (kexec_cleanup_t)(void *loader_data); |
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#ifdef CONFIG_KEXEC_VERIFY_SIG |
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typedef int (kexec_verify_sig_t)(const char *kernel_buf, |
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unsigned long kernel_len); |
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#endif |
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struct kexec_file_ops { |
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kexec_probe_t *probe; |
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kexec_load_t *load; |
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kexec_cleanup_t *cleanup; |
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#ifdef CONFIG_KEXEC_VERIFY_SIG |
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kexec_verify_sig_t *verify_sig; |
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#endif |
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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 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 unusable_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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/* If set, we are using file mode kexec syscall */ |
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unsigned int file_mode: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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#ifdef CONFIG_KEXEC_FILE |
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/* Additional fields for file based kexec syscall */ |
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void *kernel_buf; |
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unsigned long kernel_buf_len; |
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void *initrd_buf; |
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unsigned long initrd_buf_len; |
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char *cmdline_buf; |
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unsigned long cmdline_buf_len; |
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/* File operations provided by image loader */ |
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struct kexec_file_ops *fops; |
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/* Image loader handling the kernel can store a pointer here */ |
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void *image_loader_data; |
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/* Information for loading purgatory */ |
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struct purgatory_info purgatory_info; |
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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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extern int kexec_add_buffer(struct kimage *image, char *buffer, |
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unsigned long bufsz, unsigned long memsz, |
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unsigned long buf_align, unsigned long buf_min, |
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unsigned long buf_max, bool top_down, |
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unsigned long *load_addr); |
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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 int kexec_load_purgatory(struct kimage *image, unsigned long min, |
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unsigned long max, int top_down, |
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unsigned long *load_addr); |
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extern int kexec_purgatory_get_set_symbol(struct kimage *image, |
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const char *name, void *buf, |
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unsigned int size, bool get_value); |
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extern void *kexec_purgatory_get_symbol_addr(struct kimage *image, |
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const char *name); |
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extern void __crash_kexec(struct pt_regs *); |
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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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int kexec_crash_loaded(void); |
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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 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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phys_addr_t 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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#define VMCOREINFO_PAGE_OFFSET(value) \ |
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vmcoreinfo_append_str("PAGE_OFFSET=%lx\n", (unsigned long)value) |
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#define VMCOREINFO_VMALLOC_START(value) \ |
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vmcoreinfo_append_str("VMALLOC_START=%lx\n", (unsigned long)value) |
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#define VMCOREINFO_VMEMMAP_START(value) \ |
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vmcoreinfo_append_str("VMEMMAP_START=%lx\n", (unsigned long)value) |
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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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/* List of defined/legal kexec file flags */ |
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#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ |
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KEXEC_FILE_NO_INITRAMFS) |
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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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int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
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unsigned long buf_len); |
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void * __weak arch_kexec_kernel_image_load(struct kimage *image); |
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int __weak arch_kimage_file_post_load_cleanup(struct kimage *image); |
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int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, |
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unsigned long buf_len); |
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int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr, |
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Elf_Shdr *sechdrs, unsigned int relsec); |
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int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, |
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unsigned int relsec); |
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void arch_kexec_protect_crashkres(void); |
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void arch_kexec_unprotect_crashkres(void); |
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#ifndef page_to_boot_pfn |
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static inline unsigned long page_to_boot_pfn(struct page *page) |
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{ |
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return page_to_pfn(page); |
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} |
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#endif |
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#ifndef boot_pfn_to_page |
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static inline struct page *boot_pfn_to_page(unsigned long boot_pfn) |
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{ |
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return pfn_to_page(boot_pfn); |
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} |
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#endif |
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#ifndef phys_to_boot_phys |
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static inline unsigned long phys_to_boot_phys(phys_addr_t phys) |
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{ |
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return phys; |
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} |
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#endif |
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#ifndef boot_phys_to_phys |
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static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys) |
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{ |
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return boot_phys; |
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} |
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#endif |
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static inline unsigned long virt_to_boot_phys(void *addr) |
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{ |
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return phys_to_boot_phys(__pa((unsigned long)addr)); |
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} |
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static inline void *boot_phys_to_virt(unsigned long entry) |
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{ |
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return phys_to_virt(boot_phys_to_phys(entry)); |
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} |
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#else /* !CONFIG_KEXEC_CORE */ |
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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 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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static inline int kexec_crash_loaded(void) { return 0; } |
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#define kexec_in_progress false |
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#endif /* CONFIG_KEXEC_CORE */ |
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#endif /* !defined(__ASSEBMLY__) */ |
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#endif /* LINUX_KEXEC_H */
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