3000
     )¿a–Ým_J*j"Tâ€rã.ÜêbÑ¿È      )File not found.
     +ˆÆÊƒq§ÙÅ¾È ]    +/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_CRASH_DUMP_H
#define LINUX_CRASH_DUMP_H

#include <linux/kexec.h>
#include <linux/proc_fs.h>
#include <linux/elf.h>
#include <linux/pgtable.h>
#include <uapi/linux/vmcore.h>

/* For IS_ENABLED(CONFIG_CRASH_DUMP) */
#define ELFCORE_ADDR_MAX	(-1ULL)
#define ELFCORE_ADDR_ERR	(-2ULL)

extern unsigned long long elfcorehdr_addr;
extern unsigned long long elfcorehdr_size;

extern unsigned long long dm_crypt_keys_addr;

#ifdef CONFIG_CRASH_DUMP
extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
extern void elfcorehdr_free(unsigned long long addr);
extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
void elfcorehdr_fill_device_ram_ptload_elf64(Elf64_Phdr *phdr,
		unsigned long long paddr, unsigned long long size);
extern int remap_oldmem_pfn_range(struct vm_area_struct *vma,
				  unsigned long from, unsigned long pfn,
				  unsigned long size, pgprot_t prot);

ssize_t copy_oldmem_page(struct iov_iter *i, unsigned long pfn, size_t csize,
		unsigned long offset);
ssize_t copy_oldmem_page_encrypted(struct iov_iter *iter, unsigned long pfn,
				   size_t csize, unsigned long offset);

void vmcore_cleanup(void);

/* Architecture code defines this if there are other possible ELF
 * machine types, e.g. on bi-arch capable hardware. */
#ifndef vmcore_elf_check_arch_cross
#define vmcore_elf_check_arch_cross(x) 0
#endif

/*
 * Architecture code can redefine this if there are any special checks
 * needed for 32-bit ELF or 64-bit ELF vmcores.  In case of 32-bit
 * only architecture, vmcore_elf64_check_arch can be set to zero.
 */
#ifndef vmcore_elf32_check_arch
#define vmcore_elf32_check_arch(x) elf_check_arch(x)
#endif

#ifndef vmcore_elf64_check_arch
#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
#endif

#ifndef is_kdump_kernel
/*
 * is_kdump_kernel() checks whether this kernel is booting after a panic of
 * previous kernel or not. This is determined by checking if previous kernel
 * has passed the elf core header address on command line.
 *
 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
 * return true if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic
 * of previous kernel.
 */

static inline bool is_kdump_kernel(void)
{
	return elfcorehdr_addr != ELFCORE_ADDR_MAX;
}
#endif

/* is_vmcore_usable() checks if the kernel is booting after a panic and
 * the vmcore region is usable.
 *
 * This makes use of the fact that due to alignment -2ULL is not
 * a valid pointer, much in the vain of IS_ERR(), except
 * dealing directly with an unsigned long long rather than a pointer.
 */

static inline int is_vmcore_usable(void)
{
	return elfcorehdr_addr != ELFCORE_ADDR_ERR &&
		elfcorehdr_addr != ELFCORE_ADDR_MAX ? 1 : 0;
}

/* vmcore_unusable() marks the vmcore as unusable,
 * without disturbing the logic of is_kdump_kernel()
 */

static inline void vmcore_unusable(void)
{
	elfcorehdr_addr = ELFCORE_ADDR_ERR;
}

/**
 * struct vmcore_cb - driver callbacks for /proc/vmcore handling
 * @pfn_is_ram: check whether a PFN really is RAM and should be accessed when
 *              reading the vmcore. Will return "true" if it is RAM or if the
 *              callback cannot tell. If any callback returns "false", it's not
 *              RAM and the page must not be accessed; zeroes should be
 *              indicated in the vmcore instead. For example, a ballooned page
 *              contains no data and reading from such a page will cause high
 *              load in the hypervisor.
 * @get_device_ram: query RAM ranges that can only be detected by device
 *   drivers, such as the virtio-mem driver, so they can be included in
 *   the crash dump on architectures that allocate the elfcore hdr in the dump
 *   ("2nd") kernel. Indicated RAM ranges may contain holes to reduce the
 *   total number of ranges; such holes ca