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419 lines
11 KiB
419 lines
11 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#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 <linux/crash_core.h> |
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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/compat.h> |
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#include <linux/ioport.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_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME |
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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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/* |
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* Pointer to elf header at the beginning of kexec_purgatory. |
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* Note: kexec_purgatory is read only |
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*/ |
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const Elf_Ehdr *ehdr; |
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/* |
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* Temporary, modifiable buffer for sechdrs used for relocation. |
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* This memory can be freed post image load. |
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*/ |
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Elf_Shdr *sechdrs; |
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/* |
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* Temporary, modifiable buffer for stripped purgatory used for |
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* relocation. This memory can be freed post image load. |
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*/ |
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void *purgatory_buf; |
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}; |
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struct kimage; |
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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_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_SIG |
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kexec_verify_sig_t *verify_sig; |
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#endif |
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}; |
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extern const struct kexec_file_ops * const kexec_file_loaders[]; |
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int kexec_image_probe_default(struct kimage *image, void *buf, |
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unsigned long buf_len); |
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int kexec_image_post_load_cleanup_default(struct kimage *image); |
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/* |
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* If kexec_buf.mem is set to this value, kexec_locate_mem_hole() |
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* will try to allocate free memory. Arch may overwrite it. |
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*/ |
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#ifndef KEXEC_BUF_MEM_UNKNOWN |
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#define KEXEC_BUF_MEM_UNKNOWN 0 |
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#endif |
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/** |
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* struct kexec_buf - parameters for finding a place for a buffer in memory |
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* @image: kexec image in which memory to search. |
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* @buffer: Contents which will be copied to the allocated memory. |
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* @bufsz: Size of @buffer. |
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* @mem: On return will have address of the buffer in memory. |
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* @memsz: Size for the buffer in memory. |
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* @buf_align: Minimum alignment needed. |
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* @buf_min: The buffer can't be placed below this address. |
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* @buf_max: The buffer can't be placed above this address. |
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* @top_down: Allocate from top of memory. |
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*/ |
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struct kexec_buf { |
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struct kimage *image; |
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void *buffer; |
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unsigned long bufsz; |
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unsigned long mem; |
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unsigned long memsz; |
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unsigned long buf_align; |
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unsigned long buf_min; |
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unsigned long buf_max; |
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bool top_down; |
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}; |
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int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf); |
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int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name, |
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void *buf, unsigned int size, |
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bool get_value); |
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void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name); |
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/* Architectures may override the below functions */ |
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int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
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unsigned long buf_len); |
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void *arch_kexec_kernel_image_load(struct kimage *image); |
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int arch_kexec_apply_relocations_add(struct purgatory_info *pi, |
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Elf_Shdr *section, |
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const Elf_Shdr *relsec, |
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const Elf_Shdr *symtab); |
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int arch_kexec_apply_relocations(struct purgatory_info *pi, |
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Elf_Shdr *section, |
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const Elf_Shdr *relsec, |
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const Elf_Shdr *symtab); |
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int arch_kimage_file_post_load_cleanup(struct kimage *image); |
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#ifdef CONFIG_KEXEC_SIG |
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int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, |
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unsigned long buf_len); |
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#endif |
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int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf); |
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extern int kexec_add_buffer(struct kexec_buf *kbuf); |
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int kexec_locate_mem_hole(struct kexec_buf *kbuf); |
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/* Alignment required for elf header segment */ |
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#define ELF_CORE_HEADER_ALIGN 4096 |
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struct crash_mem_range { |
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u64 start, end; |
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}; |
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struct crash_mem { |
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unsigned int max_nr_ranges; |
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unsigned int nr_ranges; |
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struct crash_mem_range ranges[]; |
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}; |
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extern int crash_exclude_mem_range(struct crash_mem *mem, |
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unsigned long long mstart, |
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unsigned long long mend); |
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extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, |
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void **addr, unsigned long *sz); |
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#endif /* CONFIG_KEXEC_FILE */ |
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#ifdef CONFIG_KEXEC_ELF |
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struct kexec_elf_info { |
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/* |
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* Where the ELF binary contents are kept. |
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* Memory managed by the user of the struct. |
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*/ |
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const char *buffer; |
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const struct elfhdr *ehdr; |
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const struct elf_phdr *proghdrs; |
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}; |
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int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr, |
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struct kexec_elf_info *elf_info); |
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int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr, |
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struct kexec_elf_info *elf_info, |
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struct kexec_buf *kbuf, |
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unsigned long *lowest_load_addr); |
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void kexec_free_elf_info(struct kexec_elf_info *elf_info); |
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int kexec_elf_probe(const char *buf, unsigned long len); |
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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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void *vmcoreinfo_data_copy; /* locates in the crash memory */ |
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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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const 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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#ifdef CONFIG_IMA_KEXEC |
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/* Virtual address of IMA measurement buffer for kexec syscall */ |
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void *ima_buffer; |
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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 int kernel_kexec(void); |
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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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int machine_kexec_post_load(struct kimage *image); |
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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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extern int kimage_crash_copy_vmcoreinfo(struct kimage *image); |
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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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/* 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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extern note_buf_t __percpu *crash_notes; |
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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 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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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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#ifndef arch_kexec_post_alloc_pages |
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static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; } |
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#endif |
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#ifndef arch_kexec_pre_free_pages |
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static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { } |
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#endif |
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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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