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
booti_setup(ulong image,ulong * relocated_addr,ulong * size,bool force_reloc)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