1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * kexec for arm64
4 *
5 * Copyright (C) Linaro.
6 * Copyright (C) Huawei Futurewei Technologies.
7 */
8
9#ifndef _ARM64_KEXEC_H
10#define _ARM64_KEXEC_H
11
12/* Maximum physical address we can use pages from */
13
14#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
15
16/* Maximum address we can reach in physical address mode */
17
18#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
19
20/* Maximum address we can use for the control code buffer */
21
22#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
23
24#define KEXEC_CONTROL_PAGE_SIZE 4096
25
26#define KEXEC_ARCH KEXEC_ARCH_AARCH64
27
28#ifndef __ASSEMBLY__
29
30/**
31 * crash_setup_regs() - save registers for the panic kernel
32 *
33 * @newregs: registers are saved here
34 * @oldregs: registers to be saved (may be %NULL)
35 */
36
37static inline void crash_setup_regs(struct pt_regs *newregs,
38				    struct pt_regs *oldregs)
39{
40	if (oldregs) {
41		memcpy(newregs, oldregs, sizeof(*newregs));
42	} else {
43		u64 tmp1, tmp2;
44
45		__asm__ __volatile__ (
46			"stp	 x0,   x1, [%2, #16 *  0]\n"
47			"stp	 x2,   x3, [%2, #16 *  1]\n"
48			"stp	 x4,   x5, [%2, #16 *  2]\n"
49			"stp	 x6,   x7, [%2, #16 *  3]\n"
50			"stp	 x8,   x9, [%2, #16 *  4]\n"
51			"stp	x10,  x11, [%2, #16 *  5]\n"
52			"stp	x12,  x13, [%2, #16 *  6]\n"
53			"stp	x14,  x15, [%2, #16 *  7]\n"
54			"stp	x16,  x17, [%2, #16 *  8]\n"
55			"stp	x18,  x19, [%2, #16 *  9]\n"
56			"stp	x20,  x21, [%2, #16 * 10]\n"
57			"stp	x22,  x23, [%2, #16 * 11]\n"
58			"stp	x24,  x25, [%2, #16 * 12]\n"
59			"stp	x26,  x27, [%2, #16 * 13]\n"
60			"stp	x28,  x29, [%2, #16 * 14]\n"
61			"mov	 %0,  sp\n"
62			"stp	x30,  %0,  [%2, #16 * 15]\n"
63
64			"/* faked current PSTATE */\n"
65			"mrs	 %0, CurrentEL\n"
66			"mrs	 %1, SPSEL\n"
67			"orr	 %0, %0, %1\n"
68			"mrs	 %1, DAIF\n"
69			"orr	 %0, %0, %1\n"
70			"mrs	 %1, NZCV\n"
71			"orr	 %0, %0, %1\n"
72			/* pc */
73			"adr	 %1, 1f\n"
74		"1:\n"
75			"stp	 %1, %0,   [%2, #16 * 16]\n"
76			: "=&r" (tmp1), "=&r" (tmp2)
77			: "r" (newregs)
78			: "memory"
79		);
80	}
81}
82
83#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
84extern bool crash_is_nosave(unsigned long pfn);
85extern void crash_prepare_suspend(void);
86extern void crash_post_resume(void);
87#else
88static inline bool crash_is_nosave(unsigned long pfn) {return false; }
89static inline void crash_prepare_suspend(void) {}
90static inline void crash_post_resume(void) {}
91#endif
92
93#ifdef CONFIG_KEXEC_FILE
94#define ARCH_HAS_KIMAGE_ARCH
95
96struct kimage_arch {
97	void *dtb;
98	unsigned long dtb_mem;
99	/* Core ELF header buffer */
100	void *elf_headers;
101	unsigned long elf_headers_mem;
102	unsigned long elf_headers_sz;
103};
104
105extern const struct kexec_file_ops kexec_image_ops;
106
107struct kimage;
108
109extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
110extern int load_other_segments(struct kimage *image,
111		unsigned long kernel_load_addr, unsigned long kernel_size,
112		char *initrd, unsigned long initrd_len,
113		char *cmdline);
114#endif
115
116#endif /* __ASSEMBLY__ */
117
118#endif
119