git.sur5r.net Git - u-boot/blob - 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 {
  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 }