v4.19.13 snapshot.
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
new file mode 100644
index 0000000..9e4e638
--- /dev/null
+++ b/include/linux/kexec.h
@@ -0,0 +1,372 @@
+/* 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_VERIFY_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_VERIFY_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);
+
+/**
+ * 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);
+
+int __weak arch_kexec_apply_relocations_add(struct purgatory_info *pi,
+ Elf_Shdr *section,
+ const Elf_Shdr *relsec,
+ const Elf_Shdr *symtab);
+int __weak arch_kexec_apply_relocations(struct purgatory_info *pi,
+ Elf_Shdr *section,
+ const Elf_Shdr *relsec,
+ const Elf_Shdr *symtab);
+
+int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
+ int (*func)(struct resource *, void *));
+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[0];
+};
+
+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 */
+
+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
+};
+
+/* 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);
+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 */