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