1 /* 2 * (C) Copyright 2000-2009 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <bootm.h> 10 #include <command.h> 11 #include <image.h> 12 #include <lmb.h> 13 #include <mapmem.h> 14 #include <linux/kernel.h> 15 #include <linux/sizes.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 /* See Documentation/arm64/booting.txt in the Linux kernel */ 20 struct Image_header { 21 uint32_t code0; /* Executable code */ 22 uint32_t code1; /* Executable code */ 23 uint64_t text_offset; /* Image load offset, LE */ 24 uint64_t image_size; /* Effective Image size, LE */ 25 uint64_t flags; /* Kernel flags, LE */ 26 uint64_t res2; /* reserved */ 27 uint64_t res3; /* reserved */ 28 uint64_t res4; /* reserved */ 29 uint32_t magic; /* Magic number */ 30 uint32_t res5; 31 }; 32 33 #define LINUX_ARM64_IMAGE_MAGIC 0x644d5241 34 35 static int booti_setup(bootm_headers_t *images) 36 { 37 struct Image_header *ih; 38 uint64_t dst; 39 uint64_t image_size, text_offset; 40 41 ih = (struct Image_header *)map_sysmem(images->ep, 0); 42 43 if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) { 44 puts("Bad Linux ARM64 Image magic!\n"); 45 return 1; 46 } 47 48 /* 49 * Prior to Linux commit a2c1d73b94ed, the text_offset field 50 * is of unknown endianness. In these cases, the image_size 51 * field is zero, and we can assume a fixed value of 0x80000. 52 */ 53 if (ih->image_size == 0) { 54 puts("Image lacks image_size field, assuming 16MiB\n"); 55 image_size = 16 << 20; 56 text_offset = 0x80000; 57 } else { 58 image_size = le64_to_cpu(ih->image_size); 59 text_offset = le64_to_cpu(ih->text_offset); 60 } 61 62 /* 63 * If bit 3 of the flags field is set, the 2MB aligned base of the 64 * kernel image can be anywhere in physical memory, so respect 65 * images->ep. Otherwise, relocate the image to the base of RAM 66 * since memory below it is not accessible via the linear mapping. 67 */ 68 if (le64_to_cpu(ih->flags) & BIT(3)) 69 dst = images->ep - text_offset; 70 else 71 dst = gd->bd->bi_dram[0].start; 72 73 dst = ALIGN(dst, SZ_2M) + text_offset; 74 75 unmap_sysmem(ih); 76 77 if (images->ep != dst) { 78 void *src; 79 80 debug("Moving Image from 0x%lx to 0x%llx\n", images->ep, dst); 81 82 src = (void *)images->ep; 83 images->ep = dst; 84 memmove((void *)dst, src, image_size); 85 } 86 87 return 0; 88 } 89 90 /* 91 * Image booting support 92 */ 93 static int booti_start(cmd_tbl_t *cmdtp, int flag, int argc, 94 char * const argv[], bootm_headers_t *images) 95 { 96 int ret; 97 struct Image_header *ih; 98 99 ret = do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START, 100 images, 1); 101 102 /* Setup Linux kernel Image entry point */ 103 if (!argc) { 104 images->ep = load_addr; 105 debug("* kernel: default image load address = 0x%08lx\n", 106 load_addr); 107 } else { 108 images->ep = simple_strtoul(argv[0], NULL, 16); 109 debug("* kernel: cmdline image address = 0x%08lx\n", 110 images->ep); 111 } 112 113 ret = booti_setup(images); 114 if (ret != 0) 115 return 1; 116 117 ih = (struct Image_header *)map_sysmem(images->ep, 0); 118 119 lmb_reserve(&images->lmb, images->ep, le32_to_cpu(ih->image_size)); 120 121 unmap_sysmem(ih); 122 123 /* 124 * Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not 125 * have a header that provide this informaiton. 126 */ 127 if (bootm_find_images(flag, argc, argv)) 128 return 1; 129 130 return 0; 131 } 132 133 int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 134 { 135 int ret; 136 137 /* Consume 'booti' */ 138 argc--; argv++; 139 140 if (booti_start(cmdtp, flag, argc, argv, &images)) 141 return 1; 142 143 /* 144 * We are doing the BOOTM_STATE_LOADOS state ourselves, so must 145 * disable interrupts ourselves 146 */ 147 bootm_disable_interrupts(); 148 149 images.os.os = IH_OS_LINUX; 150 images.os.arch = IH_ARCH_ARM64; 151 ret = do_bootm_states(cmdtp, flag, argc, argv, 152 #ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH 153 BOOTM_STATE_RAMDISK | 154 #endif 155 BOOTM_STATE_OS_PREP | BOOTM_STATE_OS_FAKE_GO | 156 BOOTM_STATE_OS_GO, 157 &images, 1); 158 159 return ret; 160 } 161 162 #ifdef CONFIG_SYS_LONGHELP 163 static char booti_help_text[] = 164 "[addr [initrd[:size]] [fdt]]\n" 165 " - boot arm64 Linux Image stored in memory\n" 166 "\tThe argument 'initrd' is optional and specifies the address\n" 167 "\tof an initrd in memory. The optional parameter ':size' allows\n" 168 "\tspecifying the size of a RAW initrd.\n" 169 #if defined(CONFIG_OF_LIBFDT) 170 "\tSince booting a Linux kernel requires a flat device-tree, a\n" 171 "\tthird argument providing the address of the device-tree blob\n" 172 "\tis required. To boot a kernel with a device-tree blob but\n" 173 "\twithout an initrd image, use a '-' for the initrd argument.\n" 174 #endif 175 ""; 176 #endif 177 178 U_BOOT_CMD( 179 booti, CONFIG_SYS_MAXARGS, 1, do_booti, 180 "boot arm64 Linux Image image from memory", booti_help_text 181 ); 182