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 
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)37 static 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)
84 extern bool crash_is_nosave(unsigned long pfn);
85 extern void crash_prepare_suspend(void);
86 extern void crash_post_resume(void);
87 #else
crash_is_nosave(unsigned long pfn)88 static inline bool crash_is_nosave(unsigned long pfn) {return false; }
crash_prepare_suspend(void)89 static inline void crash_prepare_suspend(void) {}
crash_post_resume(void)90 static inline void crash_post_resume(void) {}
91 #endif
92 
93 #if defined(CONFIG_KEXEC_CORE)
94 void cpu_soft_restart(unsigned long el2_switch, unsigned long entry,
95 		      unsigned long arg0, unsigned long arg1,
96 		      unsigned long arg2);
97 #endif
98 
99 #define ARCH_HAS_KIMAGE_ARCH
100 
101 struct kimage_arch {
102 	void *dtb;
103 	phys_addr_t dtb_mem;
104 	phys_addr_t kern_reloc;
105 	phys_addr_t el2_vectors;
106 	phys_addr_t ttbr0;
107 	phys_addr_t ttbr1;
108 	phys_addr_t zero_page;
109 	unsigned long phys_offset;
110 	unsigned long t0sz;
111 };
112 
113 #ifdef CONFIG_KEXEC_FILE
114 extern const struct kexec_file_ops kexec_image_ops;
115 
116 struct kimage;
117 
118 extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
119 extern int load_other_segments(struct kimage *image,
120 		unsigned long kernel_load_addr, unsigned long kernel_size,
121 		char *initrd, unsigned long initrd_len,
122 		char *cmdline);
123 #endif
124 
125 #endif /* __ASSEMBLY__ */
126 
127 #endif
128