You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
3.0 KiB
96 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef LINUX_CRASH_DUMP_H |
|
#define LINUX_CRASH_DUMP_H |
|
|
|
#ifdef CONFIG_CRASH_DUMP |
|
#include <linux/kexec.h> |
|
#include <linux/proc_fs.h> |
|
#include <linux/elf.h> |
|
|
|
#include <asm/pgtable.h> /* for pgprot_t */ |
|
|
|
#define ELFCORE_ADDR_MAX (-1ULL) |
|
#define ELFCORE_ADDR_ERR (-2ULL) |
|
|
|
extern unsigned long long elfcorehdr_addr; |
|
extern unsigned long long elfcorehdr_size; |
|
|
|
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); |
|
extern int remap_oldmem_pfn_range(struct vm_area_struct *vma, |
|
unsigned long from, unsigned long pfn, |
|
unsigned long size, pgprot_t prot); |
|
|
|
extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
|
unsigned long, int); |
|
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 |
|
|
|
/* |
|
* 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 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of |
|
* previous kernel. |
|
*/ |
|
|
|
static inline int is_kdump_kernel(void) |
|
{ |
|
return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0; |
|
} |
|
|
|
/* 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 is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; |
|
} |
|
|
|
/* vmcore_unusable() marks the vmcore as unusable, |
|
* without disturbing the logic of is_kdump_kernel() |
|
*/ |
|
|
|
static inline void vmcore_unusable(void) |
|
{ |
|
if (is_kdump_kernel()) |
|
elfcorehdr_addr = ELFCORE_ADDR_ERR; |
|
} |
|
|
|
#define HAVE_OLDMEM_PFN_IS_RAM 1 |
|
extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)); |
|
extern void unregister_oldmem_pfn_is_ram(void); |
|
|
|
#else /* !CONFIG_CRASH_DUMP */ |
|
static inline int is_kdump_kernel(void) { return 0; } |
|
#endif /* CONFIG_CRASH_DUMP */ |
|
|
|
extern unsigned long saved_max_pfn; |
|
#endif /* LINUX_CRASHDUMP_H */
|
|
|