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 <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 }