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Vivek Goyal60e64d42005-06-25 14:58:19 -07001#ifndef LINUX_CRASH_DUMP_H
2#define LINUX_CRASH_DUMP_H
3
4#ifdef CONFIG_CRASH_DUMP
5#include <linux/kexec.h>
Vivek Goyal60e64d42005-06-25 14:58:19 -07006#include <linux/proc_fs.h>
Fabio Estevam1f536b92012-01-12 17:20:20 -08007#include <linux/elf.h>
Vivek Goyal60e64d42005-06-25 14:58:19 -07008
Qais Yousef5a610fc2014-01-14 17:56:41 -08009#include <asm/pgtable.h> /* for pgprot_t */
10
Vivek Goyal666bfdd2005-06-25 14:58:21 -070011#define ELFCORE_ADDR_MAX (-1ULL)
Simon Horman85a0ee32008-10-18 20:28:29 -070012#define ELFCORE_ADDR_ERR (-2ULL)
Ingo Molnar36ac2612008-07-26 11:22:33 +020013
Vivek Goyal2030eae2005-06-25 14:58:20 -070014extern unsigned long long elfcorehdr_addr;
Michael Holzheud3bf37952011-10-30 15:16:37 +010015extern unsigned long long elfcorehdr_size;
Ingo Molnar36ac2612008-07-26 11:22:33 +020016
Michael Holzheube8a8d02013-09-11 14:24:49 -070017extern int __weak elfcorehdr_alloc(unsigned long long *addr,
18 unsigned long long *size);
19extern void __weak elfcorehdr_free(unsigned long long addr);
20extern ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos);
21extern ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
Michael Holzheu9cb21812013-09-11 14:24:51 -070022extern int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma,
23 unsigned long from, unsigned long pfn,
24 unsigned long size, pgprot_t prot);
Michael Holzheube8a8d02013-09-11 14:24:49 -070025
Vivek Goyal60e64d42005-06-25 14:58:19 -070026extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
27 unsigned long, int);
Vivek Goyal666bfdd2005-06-25 14:58:21 -070028
Ian Campbell79e03012007-05-02 19:27:09 +020029/* Architecture code defines this if there are other possible ELF
30 * machine types, e.g. on bi-arch capable hardware. */
31#ifndef vmcore_elf_check_arch_cross
32#define vmcore_elf_check_arch_cross(x) 0
33#endif
34
Mika Westerberg9833c392010-11-19 09:29:24 +010035/*
36 * Architecture code can redefine this if there are any special checks
37 * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
38 * this can be set to zero.
39 */
40#ifndef vmcore_elf64_check_arch
41#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
42#endif
Ian Campbell79e03012007-05-02 19:27:09 +020043
Vivek Goyal57cac4d2008-10-18 20:28:25 -070044/*
45 * is_kdump_kernel() checks whether this kernel is booting after a panic of
46 * previous kernel or not. This is determined by checking if previous kernel
47 * has passed the elf core header address on command line.
48 *
49 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
50 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
51 * previous kernel.
52 */
53
Chandru95b68de2008-07-25 01:47:55 -070054static inline int is_kdump_kernel(void)
55{
56 return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
57}
Simon Horman85a0ee32008-10-18 20:28:29 -070058
59/* is_vmcore_usable() checks if the kernel is booting after a panic and
60 * the vmcore region is usable.
61 *
62 * This makes use of the fact that due to alignment -2ULL is not
63 * a valid pointer, much in the vain of IS_ERR(), except
64 * dealing directly with an unsigned long long rather than a pointer.
65 */
66
67static inline int is_vmcore_usable(void)
68{
69 return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
70}
71
72/* vmcore_unusable() marks the vmcore as unusable,
73 * without disturbing the logic of is_kdump_kernel()
74 */
75
76static inline void vmcore_unusable(void)
77{
78 if (is_kdump_kernel())
79 elfcorehdr_addr = ELFCORE_ADDR_ERR;
80}
Olaf Hering997c1362011-05-26 16:25:54 -070081
82#define HAVE_OLDMEM_PFN_IS_RAM 1
83extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn));
84extern void unregister_oldmem_pfn_is_ram(void);
85
Chandru95b68de2008-07-25 01:47:55 -070086#else /* !CONFIG_CRASH_DUMP */
87static inline int is_kdump_kernel(void) { return 0; }
Vivek Goyal60e64d42005-06-25 14:58:19 -070088#endif /* CONFIG_CRASH_DUMP */
Chandru95b68de2008-07-25 01:47:55 -070089
90extern unsigned long saved_max_pfn;
Vivek Goyal60e64d42005-06-25 14:58:19 -070091#endif /* LINUX_CRASHDUMP_H */