| | 1 | #ifndef LINUX_CRASH_DUMP_H |
| | 2 | #define LINUX_CRASH_DUMP_H |
| | 3 | |
| | 4 | #ifdef CONFIG_CRASH_DUMP |
| | 5 | #include <linux/kexec.h> |
| | 6 | #include <linux/proc_fs.h> |
| | 7 | #include <linux/elf.h> |
| | 8 | |
| | 9 | #include <asm/pgtable.h> /* for pgprot_t */ |
| | 10 | |
| | 11 | #define ELFCORE_ADDR_MAX (-1ULL) |
| | 12 | #define ELFCORE_ADDR_ERR (-2ULL) |
| | 13 | |
| | 14 | extern unsigned long long elfcorehdr_addr; |
| | 15 | extern unsigned long long elfcorehdr_size; |
| | 16 | |
| | 17 | extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size); |
| | 18 | extern void elfcorehdr_free(unsigned long long addr); |
| | 19 | extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos); |
| | 20 | extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos); |
| | 21 | extern int remap_oldmem_pfn_range(struct vm_area_struct *vma, |
| | 22 | unsigned long from, unsigned long pfn, |
| | 23 | unsigned long size, pgprot_t prot); |
| | 24 | |
| | 25 | extern ssize_t copy_oldmem_page(unsigned long, char *, size_t, |
| | 26 | unsigned long, int); |
| | 27 | void vmcore_cleanup(void); |
| | 28 | |
| | 29 | /* 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 | |
| | 35 | /* |
| | 36 | * Architecture code can redefine this if there are any special checks |
| | 37 | * needed for 32-bit ELF or 64-bit ELF vmcores. In case of 32-bit |
| | 38 | * only architecture, vmcore_elf64_check_arch can be set to zero. |
| | 39 | */ |
| | 40 | #ifndef vmcore_elf32_check_arch |
| | 41 | #define vmcore_elf32_check_arch(x) elf_check_arch(x) |
| | 42 | #endif |
| | 43 | |
| | 44 | #ifndef vmcore_elf64_check_arch |
| | 45 | #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x)) |
| | 46 | #endif |
| | 47 | |
| | 48 | /* |
| | 49 | * is_kdump_kernel() checks whether this kernel is booting after a panic of |
| | 50 | * previous kernel or not. This is determined by checking if previous kernel |
| | 51 | * has passed the elf core header address on command line. |
| | 52 | * |
| | 53 | * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will |
| | 54 | * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of |
| | 55 | * previous kernel. |
| | 56 | */ |
| | 57 | |
| | 58 | static inline int is_kdump_kernel(void) |
| | 59 | { |
| | 60 | return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0; |
| | 61 | } |
| | 62 | |
| | 63 | /* is_vmcore_usable() checks if the kernel is booting after a panic and |
| | 64 | * the vmcore region is usable. |
| | 65 | * |
| | 66 | * This makes use of the fact that due to alignment -2ULL is not |
| | 67 | * a valid pointer, much in the vain of IS_ERR(), except |
| | 68 | * dealing directly with an unsigned long long rather than a pointer. |
| | 69 | */ |
| | 70 | |
| | 71 | static inline int is_vmcore_usable(void) |
| | 72 | { |
| | 73 | return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; |
| | 74 | } |
| | 75 | |
| | 76 | /* vmcore_unusable() marks the vmcore as unusable, |
| | 77 | * without disturbing the logic of is_kdump_kernel() |
| | 78 | */ |
| | 79 | |
| | 80 | static inline void vmcore_unusable(void) |
| | 81 | { |
| | 82 | if (is_kdump_kernel()) |
| | 83 | elfcorehdr_addr = ELFCORE_ADDR_ERR; |
| | 84 | } |
| | 85 | |
| | 86 | #define HAVE_OLDMEM_PFN_IS_RAM 1 |
| | 87 | extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)); |
| | 88 | extern void unregister_oldmem_pfn_is_ram(void); |
| | 89 | |
| | 90 | #else /* !CONFIG_CRASH_DUMP */ |
| | 91 | static inline int is_kdump_kernel(void) { return 0; } |
| | 92 | #endif /* CONFIG_CRASH_DUMP */ |
| | 93 | |
| | 94 | extern unsigned long saved_max_pfn; |
| | 95 | #endif /* LINUX_CRASHDUMP_H */ |
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