include/linux/crash_dump.h

1 /* SPDX-License-Identifier: GPL-2.0 */
12 #define ELFCORE_ADDR_MAX	(-1ULL)
13 #define ELFCORE_ADDR_ERR	(-2ULL)
15 extern unsigned long long elfcorehdr_addr;
16 extern unsigned long long elfcorehdr_size;
19 extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
20 extern void elfcorehdr_free(unsigned long long addr);
24 				  unsigned long from, unsigned long pfn,
25 				  unsigned long size, pgprot_t prot);
27 ssize_t copy_oldmem_page(struct iov_iter *i, unsigned long pfn, size_t csize,
28 		unsigned long offset);
29 ssize_t copy_oldmem_page_encrypted(struct iov_iter *iter, unsigned long pfn,
30 				   size_t csize, unsigned long offset);
34 /* Architecture code defines this if there are other possible ELF
35  * machine types, e.g. on bi-arch capable hardware. */
41  * Architecture code can redefine this if there are any special checks
42  * needed for 32-bit ELF or 64-bit ELF vmcores.  In case of 32-bit
73  * This makes use of the fact that due to alignment -2ULL is not
75  * dealing directly with an unsigned long long rather than a pointer.
94  * struct vmcore_cb - driver callbacks for /proc/vmcore handling
95  * @pfn_is_ram: check whether a PFN really is RAM and should be accessed when
96  *              reading the vmcore. Will return "true" if it is RAM or if the
98  *              RAM and the page must not be accessed; zeroes should be
106  * coordinate with vmcore handling code, for example, to prevent accessing
111 	bool (*pfn_is_ram)(struct vmcore_cb *cb, unsigned long pfn);
134 	return -EOPNOTSUPP;  in vmcore_add_device_dump()
145 	return -EOPNOTSUPP;  in read_from_oldmem()