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 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 88 static inline bool crash_is_nosave(unsigned long pfn) {return false; } 89 static inline void crash_prepare_suspend(void) {} 90 static inline void crash_post_resume(void) {} 91 #endif 92 93 #define ARCH_HAS_KIMAGE_ARCH 94 95 struct kimage_arch { 96 void *dtb; 97 phys_addr_t dtb_mem; 98 phys_addr_t kern_reloc; 99 }; 100 101 #ifdef CONFIG_KEXEC_FILE 102 extern const struct kexec_file_ops kexec_image_ops; 103 104 struct kimage; 105 106 extern int arch_kimage_file_post_load_cleanup(struct kimage *image); 107 extern int load_other_segments(struct kimage *image, 108 unsigned long kernel_load_addr, unsigned long kernel_size, 109 char *initrd, unsigned long initrd_len, 110 char *cmdline); 111 #endif 112 113 #endif /* __ASSEMBLY__ */ 114 115 #endif 116