common/image-android.c

   1 /*
   2  * Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <image.h>
   9 #include <android_image.h>
  10 #include <malloc.h>
  11 #include <errno.h>
  12
  13 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
  14
  15 /**
  16  * android_image_get_kernel() - processes kernel part of Android boot images
  17  * @hdr:        Pointer to image header, which is at the start
  18  *                      of the image.
  19  * @verify:     Checksum verification flag. Currently unimplemented.
  20  * @os_data:    Pointer to a ulong variable, will hold os data start
  21  *                      address.
  22  * @os_len:     Pointer to a ulong variable, will hold os data length.
  23  *
  24  * This function returns the os image's start address and length. Also,
  25  * it appends the kernel command line to the bootargs env variable.
  26  *
  27  * Return: Zero, os start address and length on success,
  28  *              otherwise on failure.
  29  */
  30 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
  31                              ulong *os_data, ulong *os_len)
  32 {
  33         /*
  34          * Not all Android tools use the id field for signing the image with
  35          * sha1 (or anything) so we don't check it. It is not obvious that the
  36          * string is null terminated so we take care of this.
  37          */
  38         strncpy(andr_tmp_str, hdr->name, ANDR_BOOT_NAME_SIZE);
  39         andr_tmp_str[ANDR_BOOT_NAME_SIZE] = '\0';
  40         if (strlen(andr_tmp_str))
  41                 printf("Android's image name: %s\n", andr_tmp_str);
  42
  43         printf("Kernel load addr 0x%08x size %u KiB\n",
  44                hdr->kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
  45
  46         int len = 0;
  47         if (*hdr->cmdline) {
  48                 printf("Kernel command line: %s\n", hdr->cmdline);
  49                 len += strlen(hdr->cmdline);
  50         }
  51
  52         char *bootargs = getenv("bootargs");
  53         if (bootargs)
  54                 len += strlen(bootargs);
  55
  56         char *newbootargs = malloc(len + 2);
  57         if (!newbootargs) {
  58                 puts("Error: malloc in android_image_get_kernel failed!\n");
  59                 return -ENOMEM;
  60         }
  61         *newbootargs = '\0';
  62
  63         if (bootargs) {
  64                 strcpy(newbootargs, bootargs);
  65                 strcat(newbootargs, " ");
  66         }
  67         if (*hdr->cmdline)
  68                 strcat(newbootargs, hdr->cmdline);
  69
  70         setenv("bootargs", newbootargs);
  71
  72         if (os_data) {
  73                 *os_data = (ulong)hdr;
  74                 *os_data += hdr->page_size;
  75         }
  76         if (os_len)
  77                 *os_len = hdr->kernel_size;
  78         return 0;
  79 }
  80
  81 int android_image_check_header(const struct andr_img_hdr *hdr)
  82 {
  83         return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
  84 }
  85
  86 ulong android_image_get_end(const struct andr_img_hdr *hdr)
  87 {
  88         ulong end;
  89         /*
  90          * The header takes a full page, the remaining components are aligned
  91          * on page boundary
  92          */
  93         end = (ulong)hdr;
  94         end += hdr->page_size;
  95         end += ALIGN(hdr->kernel_size, hdr->page_size);
  96         end += ALIGN(hdr->ramdisk_size, hdr->page_size);
  97         end += ALIGN(hdr->second_size, hdr->page_size);
  98
  99         return end;
 100 }
 101
 102 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
 103 {
 104         return hdr->kernel_addr;
 105 }
 106
 107 int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
 108                               ulong *rd_data, ulong *rd_len)
 109 {
 110         if (!hdr->ramdisk_size)
 111                 return -1;
 112
 113         printf("RAM disk load addr 0x%08x size %u KiB\n",
 114                hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
 115
 116         *rd_data = (unsigned long)hdr;
 117         *rd_data += hdr->page_size;
 118         *rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
 119
 120         *rd_len = hdr->ramdisk_size;
 121         return 0;
 122 }