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- /* SPDX-License-Identifier: GPL-2.0 */
- #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 <linux/crash_core.h>
- #include <asm/io.h>
- #include <uapi/linux/kexec.h>
- #include <linux/verification.h>
- /* Location of a reserved region to hold the crash kernel.
- */
- extern struct resource crashk_res;
- extern struct resource crashk_low_res;
- extern note_buf_t __percpu *crash_notes;
- #ifdef CONFIG_KEXEC_CORE
- #include <linux/list.h>
- #include <linux/compat.h>
- #include <linux/ioport.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 | __GFP_NORETRY)
- #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_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
- /*
- * 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
- #ifdef CONFIG_KEXEC_FILE
- struct purgatory_info {
- /*
- * Pointer to elf header at the beginning of kexec_purgatory.
- * Note: kexec_purgatory is read only
- */
- const Elf_Ehdr *ehdr;
- /*
- * Temporary, modifiable buffer for sechdrs used for relocation.
- * This memory can be freed post image load.
- */
- Elf_Shdr *sechdrs;
- /*
- * Temporary, modifiable buffer for stripped purgatory used for
- * relocation. This memory can be freed post image load.
- */
- void *purgatory_buf;
- };
- struct kimage;
- 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);
- #ifdef CONFIG_KEXEC_SIG
- typedef int (kexec_verify_sig_t)(const char *kernel_buf,
- unsigned long kernel_len);
- #endif
- struct kexec_file_ops {
- kexec_probe_t *probe;
- kexec_load_t *load;
- kexec_cleanup_t *cleanup;
- #ifdef CONFIG_KEXEC_SIG
- kexec_verify_sig_t *verify_sig;
- #endif
- };
- extern const struct kexec_file_ops * const kexec_file_loaders[];
- int kexec_image_probe_default(struct kimage *image, void *buf,
- unsigned long buf_len);
- int kexec_image_post_load_cleanup_default(struct kimage *image);
- /*
- * If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
- * will try to allocate free memory. Arch may overwrite it.
- */
- #ifndef KEXEC_BUF_MEM_UNKNOWN
- #define KEXEC_BUF_MEM_UNKNOWN 0
- #endif
- /**
- * struct kexec_buf - parameters for finding a place for a buffer in memory
- * @image: kexec image in which memory to search.
- * @buffer: Contents which will be copied to the allocated memory.
- * @bufsz: Size of @buffer.
- * @mem: On return will have address of the buffer in memory.
- * @memsz: Size for the buffer in memory.
- * @buf_align: Minimum alignment needed.
- * @buf_min: The buffer can't be placed below this address.
- * @buf_max: The buffer can't be placed above this address.
- * @top_down: Allocate from top of memory.
- */
- struct kexec_buf {
- struct kimage *image;
- void *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;
- };
- int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
- int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
- void *buf, unsigned int size,
- bool get_value);
- void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
- void *kexec_image_load_default(struct kimage *image);
- #ifndef arch_kexec_kernel_image_probe
- static inline int
- arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
- {
- return kexec_image_probe_default(image, buf, buf_len);
- }
- #endif
- #ifndef arch_kimage_file_post_load_cleanup
- static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
- {
- return kexec_image_post_load_cleanup_default(image);
- }
- #endif
- #ifndef arch_kexec_kernel_image_load
- static inline void *arch_kexec_kernel_image_load(struct kimage *image)
- {
- return kexec_image_load_default(image);
- }
- #endif
- #ifdef CONFIG_KEXEC_SIG
- #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
- int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
- #endif
- #endif
- extern int kexec_add_buffer(struct kexec_buf *kbuf);
- int kexec_locate_mem_hole(struct kexec_buf *kbuf);
- #ifndef arch_kexec_locate_mem_hole
- /**
- * arch_kexec_locate_mem_hole - Find free memory to place the segments.
- * @kbuf: Parameters for the memory search.
- *
- * On success, kbuf->mem will have the start address of the memory region found.
- *
- * Return: 0 on success, negative errno on error.
- */
- static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
- {
- return kexec_locate_mem_hole(kbuf);
- }
- #endif
- /* Alignment required for elf header segment */
- #define ELF_CORE_HEADER_ALIGN 4096
- struct crash_mem_range {
- u64 start, end;
- };
- struct crash_mem {
- unsigned int max_nr_ranges;
- unsigned int nr_ranges;
- struct crash_mem_range ranges[];
- };
- extern int crash_exclude_mem_range(struct crash_mem *mem,
- unsigned long long mstart,
- unsigned long long mend);
- extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
- void **addr, unsigned long *sz);
- #ifndef arch_kexec_apply_relocations_add
- /*
- * arch_kexec_apply_relocations_add - apply relocations of type RELA
- * @pi: Purgatory to be relocated.
- * @section: Section relocations applying to.
- * @relsec: Section containing RELAs.
- * @symtab: Corresponding symtab.
- *
- * Return: 0 on success, negative errno on error.
- */
- static inline int
- arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
- const Elf_Shdr *relsec, const Elf_Shdr *symtab)
- {
- pr_err("RELA relocation unsupported.\n");
- return -ENOEXEC;
- }
- #endif
- #ifndef arch_kexec_apply_relocations
- /*
- * arch_kexec_apply_relocations - apply relocations of type REL
- * @pi: Purgatory to be relocated.
- * @section: Section relocations applying to.
- * @relsec: Section containing RELs.
- * @symtab: Corresponding symtab.
- *
- * Return: 0 on success, negative errno on error.
- */
- static inline int
- arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
- const Elf_Shdr *relsec, const Elf_Shdr *symtab)
- {
- pr_err("REL relocation unsupported.\n");
- return -ENOEXEC;
- }
- #endif
- #endif /* CONFIG_KEXEC_FILE */
- #ifdef CONFIG_KEXEC_ELF
- struct kexec_elf_info {
- /*
- * Where the ELF binary contents are kept.
- * Memory managed by the user of the struct.
- */
- const char *buffer;
- const struct elfhdr *ehdr;
- const struct elf_phdr *proghdrs;
- };
- int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
- struct kexec_elf_info *elf_info);
- int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
- struct kexec_elf_info *elf_info,
- struct kexec_buf *kbuf,
- unsigned long *lowest_load_addr);
- void kexec_free_elf_info(struct kexec_elf_info *elf_info);
- int kexec_elf_probe(const char *buf, unsigned long len);
- #endif
- 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;
- void *vmcoreinfo_data_copy; /* locates in the crash memory */
- 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
- #ifdef CONFIG_KEXEC_FILE
- /* 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 */
- const 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;
- #endif
- #ifdef CONFIG_IMA_KEXEC
- /* Virtual address of IMA measurement buffer for kexec syscall */
- void *ima_buffer;
- phys_addr_t ima_buffer_addr;
- size_t ima_buffer_size;
- #endif
- /* Core ELF header buffer */
- void *elf_headers;
- unsigned long elf_headers_sz;
- unsigned long elf_load_addr;
- };
- /* 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 int kernel_kexec(void);
- extern struct page *kimage_alloc_control_pages(struct kimage *image,
- unsigned int order);
- #ifndef machine_kexec_post_load
- static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
- #endif
- extern void __crash_kexec(struct pt_regs *);
- extern void crash_kexec(struct pt_regs *);
- int kexec_should_crash(struct task_struct *);
- int kexec_crash_loaded(void);
- void crash_save_cpu(struct pt_regs *regs, int cpu);
- extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
- 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)
- /* flag to track if kexec reboot is in progress */
- extern bool kexec_in_progress;
- int crash_shrink_memory(unsigned long new_size);
- ssize_t crash_get_memory_size(void);
- #ifndef arch_kexec_protect_crashkres
- /*
- * Protection mechanism for crashkernel reserved memory after
- * the kdump kernel is loaded.
- *
- * Provide an empty default implementation here -- architecture
- * code may override this
- */
- static inline void arch_kexec_protect_crashkres(void) { }
- #endif
- #ifndef arch_kexec_unprotect_crashkres
- static inline void arch_kexec_unprotect_crashkres(void) { }
- #endif
- #ifndef page_to_boot_pfn
- static inline unsigned long page_to_boot_pfn(struct page *page)
- {
- return page_to_pfn(page);
- }
- #endif
- #ifndef boot_pfn_to_page
- static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
- {
- return pfn_to_page(boot_pfn);
- }
- #endif
- #ifndef phys_to_boot_phys
- static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
- {
- return phys;
- }
- #endif
- #ifndef boot_phys_to_phys
- static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
- {
- return boot_phys;
- }
- #endif
- #ifndef crash_free_reserved_phys_range
- static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
- {
- unsigned long addr;
- for (addr = begin; addr < end; addr += PAGE_SIZE)
- free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
- }
- #endif
- static inline unsigned long virt_to_boot_phys(void *addr)
- {
- return phys_to_boot_phys(__pa((unsigned long)addr));
- }
- static inline void *boot_phys_to_virt(unsigned long entry)
- {
- return phys_to_virt(boot_phys_to_phys(entry));
- }
- #ifndef arch_kexec_post_alloc_pages
- static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
- #endif
- #ifndef arch_kexec_pre_free_pages
- static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
- #endif
- #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; }
- static inline int kexec_crash_loaded(void) { return 0; }
- #define kexec_in_progress false
- #endif /* CONFIG_KEXEC_CORE */
- #ifdef CONFIG_KEXEC_SIG
- void set_kexec_sig_enforced(void);
- #else
- static inline void set_kexec_sig_enforced(void) {}
- #endif
- #endif /* !defined(__ASSEBMLY__) */
- #endif /* LINUX_KEXEC_H */
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