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 { 31 struct Image_header *ih; 32 uint64_t dst; 33 uint64_t image_size, text_offset; 34 35 *relocated_addr = image; 36 37 ih = (struct Image_header *)map_sysmem(image, 0); 38 39 if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) { 40 puts("Bad Linux ARM64 Image magic!\n"); 41 return 1; 42 } 43 44 /* 45 * Prior to Linux commit a2c1d73b94ed, the text_offset field 46 * is of unknown endianness. In these cases, the image_size 47 * field is zero, and we can assume a fixed value of 0x80000. 48 */ 49 if (ih->image_size == 0) { 50 puts("Image lacks image_size field, assuming 16MiB\n"); 51 image_size = 16 << 20; 52 text_offset = 0x80000; 53 } else { 54 image_size = le64_to_cpu(ih->image_size); 55 text_offset = le64_to_cpu(ih->text_offset); 56 } 57 58 *size = image_size; 59 60 /* 61 * If bit 3 of the flags field is set, the 2MB aligned base of the 62 * kernel image can be anywhere in physical memory, so respect 63 * images->ep. Otherwise, relocate the image to the base of RAM 64 * since memory below it is not accessible via the linear mapping. 65 */ 66 if (le64_to_cpu(ih->flags) & BIT(3)) 67 dst = image - text_offset; 68 else 69 dst = gd->bd->bi_dram[0].start; 70 71 *relocated_addr = ALIGN(dst, SZ_2M) + text_offset; 72 73 unmap_sysmem(ih); 74 75 return 0; 76 } 77