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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/device.h>
7#include <linux/proc_fs.h>
8
Vivek Goyal666bfdd2005-06-25 14:58:21 -07009#define ELFCORE_ADDR_MAX (-1ULL)
Simon Horman85a0ee32008-10-18 20:28:29 -070010#define ELFCORE_ADDR_ERR (-2ULL)
Ingo Molnar36ac2612008-07-26 11:22:33 +020011
Vivek Goyal2030eae2005-06-25 14:58:20 -070012extern unsigned long long elfcorehdr_addr;
Ingo Molnar36ac2612008-07-26 11:22:33 +020013
Vivek Goyal60e64d42005-06-25 14:58:19 -070014extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
15 unsigned long, int);
Vivek Goyal666bfdd2005-06-25 14:58:21 -070016
Ian Campbell79e03012007-05-02 19:27:09 +020017/* Architecture code defines this if there are other possible ELF
18 * machine types, e.g. on bi-arch capable hardware. */
19#ifndef vmcore_elf_check_arch_cross
20#define vmcore_elf_check_arch_cross(x) 0
21#endif
22
Mika Westerberg9833c392010-11-19 09:29:24 +010023/*
24 * Architecture code can redefine this if there are any special checks
25 * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
26 * this can be set to zero.
27 */
28#ifndef vmcore_elf64_check_arch
29#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
30#endif
Ian Campbell79e03012007-05-02 19:27:09 +020031
Vivek Goyal57cac4d2008-10-18 20:28:25 -070032/*
33 * is_kdump_kernel() checks whether this kernel is booting after a panic of
34 * previous kernel or not. This is determined by checking if previous kernel
35 * has passed the elf core header address on command line.
36 *
37 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
38 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
39 * previous kernel.
40 */
41
Chandru95b68de2008-07-25 01:47:55 -070042static inline int is_kdump_kernel(void)
43{
44 return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
45}
Simon Horman85a0ee32008-10-18 20:28:29 -070046
47/* is_vmcore_usable() checks if the kernel is booting after a panic and
48 * the vmcore region is usable.
49 *
50 * This makes use of the fact that due to alignment -2ULL is not
51 * a valid pointer, much in the vain of IS_ERR(), except
52 * dealing directly with an unsigned long long rather than a pointer.
53 */
54
55static inline int is_vmcore_usable(void)
56{
57 return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
58}
59
60/* vmcore_unusable() marks the vmcore as unusable,
61 * without disturbing the logic of is_kdump_kernel()
62 */
63
64static inline void vmcore_unusable(void)
65{
66 if (is_kdump_kernel())
67 elfcorehdr_addr = ELFCORE_ADDR_ERR;
68}
Chandru95b68de2008-07-25 01:47:55 -070069#else /* !CONFIG_CRASH_DUMP */
70static inline int is_kdump_kernel(void) { return 0; }
Vivek Goyal60e64d42005-06-25 14:58:19 -070071#endif /* CONFIG_CRASH_DUMP */
Chandru95b68de2008-07-25 01:47:55 -070072
73extern unsigned long saved_max_pfn;
Vivek Goyal60e64d42005-06-25 14:58:19 -070074#endif /* LINUX_CRASHDUMP_H */