global: Migrate CONFIG_SYS_FSL* symbols to the CFG_SYS namespace
[platform/kernel/u-boot.git] / arch / arm / lib / image.c
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 <image.h>
9 #include <mapmem.h>
10 #include <asm/global_data.h>
11 #include <linux/bitops.h>
12 #include <linux/sizes.h>
13
14 DECLARE_GLOBAL_DATA_PTR;
15
16 #define LINUX_ARM64_IMAGE_MAGIC 0x644d5241
17
18 /* See Documentation/arm64/booting.txt in the Linux kernel */
19 struct Image_header {
20         uint32_t        code0;          /* Executable code */
21         uint32_t        code1;          /* Executable code */
22         uint64_t        text_offset;    /* Image load offset, LE */
23         uint64_t        image_size;     /* Effective Image size, LE */
24         uint64_t        flags;          /* Kernel flags, LE */
25         uint64_t        res2;           /* reserved */
26         uint64_t        res3;           /* reserved */
27         uint64_t        res4;           /* reserved */
28         uint32_t        magic;          /* Magic number */
29         uint32_t        res5;
30 };
31
32 int booti_setup(ulong image, ulong *relocated_addr, ulong *size,
33                 bool force_reloc)
34 {
35         struct Image_header *ih;
36         uint64_t dst;
37         uint64_t image_size, text_offset;
38
39         *relocated_addr = image;
40
41         ih = (struct Image_header *)map_sysmem(image, 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         *size = image_size;
63
64         /*
65          * If bit 3 of the flags field is set, the 2MB aligned base of the
66          * kernel image can be anywhere in physical memory, so respect
67          * images->ep.  Otherwise, relocate the image to the base of RAM
68          * since memory below it is not accessible via the linear mapping.
69          */
70         if (!force_reloc && (le64_to_cpu(ih->flags) & BIT(3)))
71                 dst = image - text_offset;
72         else
73                 dst = gd->bd->bi_dram[0].start;
74
75         *relocated_addr = ALIGN(dst, SZ_2M) + text_offset;
76
77         unmap_sysmem(ih);
78
79         return 0;
80 }