1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * kexec for arm64
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) Linaro.
6*4882a593Smuzhiyun * Copyright (C) Huawei Futurewei Technologies.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef _ARM64_KEXEC_H
10*4882a593Smuzhiyun #define _ARM64_KEXEC_H
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun /* Maximum physical address we can use pages from */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /* Maximum address we can reach in physical address mode */
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun /* Maximum address we can use for the control code buffer */
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define KEXEC_CONTROL_PAGE_SIZE 4096
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define KEXEC_ARCH KEXEC_ARCH_AARCH64
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #ifndef __ASSEMBLY__
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /**
31*4882a593Smuzhiyun * crash_setup_regs() - save registers for the panic kernel
32*4882a593Smuzhiyun *
33*4882a593Smuzhiyun * @newregs: registers are saved here
34*4882a593Smuzhiyun * @oldregs: registers to be saved (may be %NULL)
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)37*4882a593Smuzhiyun static inline void crash_setup_regs(struct pt_regs *newregs,
38*4882a593Smuzhiyun struct pt_regs *oldregs)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun if (oldregs) {
41*4882a593Smuzhiyun memcpy(newregs, oldregs, sizeof(*newregs));
42*4882a593Smuzhiyun } else {
43*4882a593Smuzhiyun u64 tmp1, tmp2;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun __asm__ __volatile__ (
46*4882a593Smuzhiyun "stp x0, x1, [%2, #16 * 0]\n"
47*4882a593Smuzhiyun "stp x2, x3, [%2, #16 * 1]\n"
48*4882a593Smuzhiyun "stp x4, x5, [%2, #16 * 2]\n"
49*4882a593Smuzhiyun "stp x6, x7, [%2, #16 * 3]\n"
50*4882a593Smuzhiyun "stp x8, x9, [%2, #16 * 4]\n"
51*4882a593Smuzhiyun "stp x10, x11, [%2, #16 * 5]\n"
52*4882a593Smuzhiyun "stp x12, x13, [%2, #16 * 6]\n"
53*4882a593Smuzhiyun "stp x14, x15, [%2, #16 * 7]\n"
54*4882a593Smuzhiyun "stp x16, x17, [%2, #16 * 8]\n"
55*4882a593Smuzhiyun "stp x18, x19, [%2, #16 * 9]\n"
56*4882a593Smuzhiyun "stp x20, x21, [%2, #16 * 10]\n"
57*4882a593Smuzhiyun "stp x22, x23, [%2, #16 * 11]\n"
58*4882a593Smuzhiyun "stp x24, x25, [%2, #16 * 12]\n"
59*4882a593Smuzhiyun "stp x26, x27, [%2, #16 * 13]\n"
60*4882a593Smuzhiyun "stp x28, x29, [%2, #16 * 14]\n"
61*4882a593Smuzhiyun "mov %0, sp\n"
62*4882a593Smuzhiyun "stp x30, %0, [%2, #16 * 15]\n"
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun "/* faked current PSTATE */\n"
65*4882a593Smuzhiyun "mrs %0, CurrentEL\n"
66*4882a593Smuzhiyun "mrs %1, SPSEL\n"
67*4882a593Smuzhiyun "orr %0, %0, %1\n"
68*4882a593Smuzhiyun "mrs %1, DAIF\n"
69*4882a593Smuzhiyun "orr %0, %0, %1\n"
70*4882a593Smuzhiyun "mrs %1, NZCV\n"
71*4882a593Smuzhiyun "orr %0, %0, %1\n"
72*4882a593Smuzhiyun /* pc */
73*4882a593Smuzhiyun "adr %1, 1f\n"
74*4882a593Smuzhiyun "1:\n"
75*4882a593Smuzhiyun "stp %1, %0, [%2, #16 * 16]\n"
76*4882a593Smuzhiyun : "=&r" (tmp1), "=&r" (tmp2)
77*4882a593Smuzhiyun : "r" (newregs)
78*4882a593Smuzhiyun : "memory"
79*4882a593Smuzhiyun );
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun #if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
84*4882a593Smuzhiyun extern bool crash_is_nosave(unsigned long pfn);
85*4882a593Smuzhiyun extern void crash_prepare_suspend(void);
86*4882a593Smuzhiyun extern void crash_post_resume(void);
87*4882a593Smuzhiyun #else
crash_is_nosave(unsigned long pfn)88*4882a593Smuzhiyun static inline bool crash_is_nosave(unsigned long pfn) {return false; }
crash_prepare_suspend(void)89*4882a593Smuzhiyun static inline void crash_prepare_suspend(void) {}
crash_post_resume(void)90*4882a593Smuzhiyun static inline void crash_post_resume(void) {}
91*4882a593Smuzhiyun #endif
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun #ifdef CONFIG_KEXEC_FILE
94*4882a593Smuzhiyun #define ARCH_HAS_KIMAGE_ARCH
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun struct kimage_arch {
97*4882a593Smuzhiyun void *dtb;
98*4882a593Smuzhiyun unsigned long dtb_mem;
99*4882a593Smuzhiyun /* Core ELF header buffer */
100*4882a593Smuzhiyun void *elf_headers;
101*4882a593Smuzhiyun unsigned long elf_headers_mem;
102*4882a593Smuzhiyun unsigned long elf_headers_sz;
103*4882a593Smuzhiyun };
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun extern const struct kexec_file_ops kexec_image_ops;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun struct kimage;
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
110*4882a593Smuzhiyun extern int load_other_segments(struct kimage *image,
111*4882a593Smuzhiyun unsigned long kernel_load_addr, unsigned long kernel_size,
112*4882a593Smuzhiyun char *initrd, unsigned long initrd_len,
113*4882a593Smuzhiyun char *cmdline);
114*4882a593Smuzhiyun #endif
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun #endif
119