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 long paddr, unsigned long long size);
26 				  unsigned long from, unsigned long pfn,
27 				  unsigned long size, pgprot_t prot);
29 ssize_t copy_oldmem_page(struct iov_iter *i, unsigned long pfn, size_t csize,
30 		unsigned long offset);
31 ssize_t copy_oldmem_page_encrypted(struct iov_iter *iter, unsigned long pfn,
32 				   size_t csize, unsigned long offset);
36 /* Architecture code defines this if there are other possible ELF
37  * machine types, e.g. on bi-arch capable hardware. */
43  * Architecture code can redefine this if there are any special checks
44  * needed for 32-bit ELF or 64-bit ELF vmcores.  In case of 32-bit
75  * This makes use of the fact that due to alignment -2ULL is not
77  * dealing directly with an unsigned long long rather than a pointer.
96  * struct vmcore_cb - driver callbacks for /proc/vmcore handling
97  * @pfn_is_ram: check whether a PFN really is RAM and should be accessed when
98  *              reading the vmcore. Will return "true" if it is RAM or if the
100  *              RAM and the page must not be accessed; zeroes should be
104  * @get_device_ram: query RAM ranges that can only be detected by device
105  *   drivers, such as the virtio-mem driver, so they can be included in
107  *   ("2nd") kernel. Indicated RAM ranges may contain holes to reduce the
109  *   callback just like for other RAM.
114  * coordinate with vmcore handling code, for example, to prevent accessing
119 	bool (*pfn_is_ram)(struct vmcore_cb *cb, unsigned long pfn);
128 	unsigned long long paddr;
129 	unsigned long long size;
135 		unsigned long long paddr, unsigned long long size)  in vmcore_alloc_add_range()
140 		return -ENOMEM;  in vmcore_alloc_add_range()
141 	m->paddr = paddr;  in vmcore_alloc_add_range()
142 	m->size = size;  in vmcore_alloc_add_range()
143 	list_add_tail(&m->list, list);  in vmcore_alloc_add_range()
153 		list_del(&m->list);  in vmcore_free_ranges()
175 	return -EOPNOTSUPP;  in vmcore_add_device_dump()
186 	return -EOPNOTSUPP;  in read_from_oldmem()