| /* 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> |
| |
| #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); |
| |
| /* Architectures may override the below functions */ |
| int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
| unsigned long buf_len); |
| void *arch_kexec_kernel_image_load(struct kimage *image); |
| int arch_kexec_apply_relocations_add(struct purgatory_info *pi, |
| Elf_Shdr *section, |
| const Elf_Shdr *relsec, |
| const Elf_Shdr *symtab); |
| int arch_kexec_apply_relocations(struct purgatory_info *pi, |
| Elf_Shdr *section, |
| const Elf_Shdr *relsec, |
| const Elf_Shdr *symtab); |
| int arch_kimage_file_post_load_cleanup(struct kimage *image); |
| #ifdef CONFIG_KEXEC_SIG |
| int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, |
| unsigned long buf_len); |
| #endif |
| int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf); |
| |
| extern int kexec_add_buffer(struct kexec_buf *kbuf); |
| int kexec_locate_mem_hole(struct kexec_buf *kbuf); |
| |
| /* 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 kernel_map, |
| void **addr, unsigned long *sz); |
| #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); |
| int machine_kexec_post_load(struct kimage *image); |
| |
| 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) |
| |
| /* 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; |
| |
| /* flag to track if kexec reboot is in progress */ |
| extern bool kexec_in_progress; |
| |
| 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); |
| |
| void arch_kexec_protect_crashkres(void); |
| void arch_kexec_unprotect_crashkres(void); |
| |
| #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 |
| |
| 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 */ |
| |
| #endif /* !defined(__ASSEBMLY__) */ |
| |
| #endif /* LINUX_KEXEC_H */ |