1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2005
4 *
5 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
6 *
7 */
8
9#ifndef _S390_KEXEC_H
10#define _S390_KEXEC_H
11
12#include <linux/module.h>
13
14#include <asm/processor.h>
15#include <asm/page.h>
16#include <asm/setup.h>
17/*
18 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
19 * I.e. Maximum page that is mapped directly into kernel memory,
20 * and kmap is not required.
21 */
22
23/* Maximum physical address we can use pages from */
24#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
25
26/* Maximum address we can reach in physical address mode */
27#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
28
29/* Maximum address we can use for the control pages */
30/* Not more than 2GB */
31#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
32
33/* Allocate control page with GFP_DMA */
34#define KEXEC_CONTROL_MEMORY_GFP (GFP_DMA | __GFP_NORETRY)
35
36/* Maximum address we can use for the crash control pages */
37#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
38
39/* Allocate one page for the pdp and the second for the code */
40#define KEXEC_CONTROL_PAGE_SIZE 4096
41
42/* Alignment of crashkernel memory */
43#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
44
45/* The native architecture */
46#define KEXEC_ARCH KEXEC_ARCH_S390
47
48/* Allow kexec_file to load a segment to 0 */
49#define KEXEC_BUF_MEM_UNKNOWN -1
50
51/* Provide a dummy definition to avoid build failures. */
52static inline void crash_setup_regs(struct pt_regs *newregs,
53					struct pt_regs *oldregs) { }
54
55struct kimage;
56struct s390_load_data {
57	/* Pointer to the kernel buffer. Used to register cmdline etc.. */
58	void *kernel_buf;
59
60	/* Load address of the kernel_buf. */
61	unsigned long kernel_mem;
62
63	/* Parmarea in the kernel buffer. */
64	struct parmarea *parm;
65
66	/* Total size of loaded segments in memory. Used as an offset. */
67	size_t memsz;
68
69	struct ipl_report *report;
70};
71
72int s390_verify_sig(const char *kernel, unsigned long kernel_len);
73void *kexec_file_add_components(struct kimage *image,
74				int (*add_kernel)(struct kimage *image,
75						  struct s390_load_data *data));
76int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
77			 unsigned long addr);
78
79#define ARCH_HAS_KIMAGE_ARCH
80
81struct kimage_arch {
82	void *ipl_buf;
83};
84
85extern const struct kexec_file_ops s390_kexec_image_ops;
86extern const struct kexec_file_ops s390_kexec_elf_ops;
87
88#ifdef CONFIG_CRASH_DUMP
89void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
90#define crash_free_reserved_phys_range crash_free_reserved_phys_range
91
92void arch_kexec_protect_crashkres(void);
93#define arch_kexec_protect_crashkres arch_kexec_protect_crashkres
94
95void arch_kexec_unprotect_crashkres(void);
96#define arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres
97#endif
98
99#ifdef CONFIG_KEXEC_FILE
100struct purgatory_info;
101int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
102				     Elf_Shdr *section,
103				     const Elf_Shdr *relsec,
104				     const Elf_Shdr *symtab);
105#define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
106
107int arch_kimage_file_post_load_cleanup(struct kimage *image);
108#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
109#endif
110#endif /*_S390_KEXEC_H */
111