1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2000-2009 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 */ 6 7 #include <common.h> 8 #include <mapmem.h> 9 #include <linux/sizes.h> 10 11 DECLARE_GLOBAL_DATA_PTR; 12 13 #define LINUX_ARM64_IMAGE_MAGIC 0x644d5241 14 15 /* See Documentation/arm64/booting.txt in the Linux kernel */ 16 struct Image_header { 17 uint32_t code0; /* Executable code */ 18 uint32_t code1; /* Executable code */ 19 uint64_t text_offset; /* Image load offset, LE */ 20 uint64_t image_size; /* Effective Image size, LE */ 21 uint64_t flags; /* Kernel flags, LE */ 22 uint64_t res2; /* reserved */ 23 uint64_t res3; /* reserved */ 24 uint64_t res4; /* reserved */ 25 uint32_t magic; /* Magic number */ 26 uint32_t res5; 27 }; 28 29 int booti_setup(ulong image, ulong *relocated_addr, ulong *size, 30 bool force_reloc) 31 { 32 struct Image_header *ih; 33 uint64_t dst; 34 uint64_t image_size, text_offset; 35 36 *relocated_addr = image; 37 38 ih = (struct Image_header *)map_sysmem(image, 0); 39 40 if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) { 41 puts("Bad Linux ARM64 Image magic!\n"); 42 return 1; 43 } 44 45 /* 46 * Prior to Linux commit a2c1d73b94ed, the text_offset field 47 * is of unknown endianness. In these cases, the image_size 48 * field is zero, and we can assume a fixed value of 0x80000. 49 */ 50 if (ih->image_size == 0) { 51 puts("Image lacks image_size field, assuming 16MiB\n"); 52 image_size = 16 << 20; 53 text_offset = 0x80000; 54 } else { 55 image_size = le64_to_cpu(ih->image_size); 56 text_offset = le64_to_cpu(ih->text_offset); 57 } 58 59 *size = image_size; 60 61 /* 62 * If bit 3 of the flags field is set, the 2MB aligned base of the 63 * kernel image can be anywhere in physical memory, so respect 64 * images->ep. Otherwise, relocate the image to the base of RAM 65 * since memory below it is not accessible via the linear mapping. 66 */ 67 if (!force_reloc && (le64_to_cpu(ih->flags) & BIT(3))) 68 dst = image - text_offset; 69 else 70 dst = gd->bd->bi_dram[0].start; 71 72 *relocated_addr = ALIGN(dst, SZ_2M) + text_offset; 73 74 unmap_sysmem(ih); 75 76 return 0; 77 } 78