1/*
2 * Copyright IBM Corp. 2005
3 *
4 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
5 *
6 */
7
8#ifndef _S390_KEXEC_H
9#define _S390_KEXEC_H
10
11#include <asm/processor.h>
12#include <asm/page.h>
13/*
14 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
15 * I.e. Maximum page that is mapped directly into kernel memory,
16 * and kmap is not required.
17 */
18
19/* Maximum physical address we can use pages from */
20#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
21
22/* Maximum address we can reach in physical address mode */
23#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
24
25/* Maximum address we can use for the control pages */
26/* Not more than 2GB */
27#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
28
29/* Allocate control page with GFP_DMA */
30#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
31
32/* Maximum address we can use for the crash control pages */
33#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
34
35/* Allocate one page for the pdp and the second for the code */
36#define KEXEC_CONTROL_PAGE_SIZE 4096
37
38/* Alignment of crashkernel memory */
39#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
40
41/* The native architecture */
42#define KEXEC_ARCH KEXEC_ARCH_S390
43
44/*
45 * Size for s390x ELF notes per CPU
46 *
47 * Seven notes plus zero note at the end: prstatus, fpregset, timer,
48 * tod_cmp, tod_reg, control regs, and prefix
49 */
50#define KEXEC_NOTE_BYTES \
51	(ALIGN(sizeof(struct elf_note), 4) * 8 + \
52	 ALIGN(sizeof("CORE"), 4) * 7 + \
53	 ALIGN(sizeof(struct elf_prstatus), 4) + \
54	 ALIGN(sizeof(elf_fpregset_t), 4) + \
55	 ALIGN(sizeof(u64), 4) + \
56	 ALIGN(sizeof(u64), 4) + \
57	 ALIGN(sizeof(u32), 4) + \
58	 ALIGN(sizeof(u64) * 16, 4) + \
59	 ALIGN(sizeof(u32), 4) \
60	)
61
62/* Provide a dummy definition to avoid build failures. */
63static inline void crash_setup_regs(struct pt_regs *newregs,
64					struct pt_regs *oldregs) { }
65
66#endif /*_S390_KEXEC_H */
67