2 * Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <android_image.h>
13 #define ANDROID_IMAGE_DEFAULT_KERNEL_ADDR 0x10008000
15 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
17 static ulong android_image_get_kernel_addr(const struct andr_img_hdr *hdr)
20 * All the Android tools that generate a boot.img use this
21 * address as the default.
23 * Even though it doesn't really make a lot of sense, and it
24 * might be valid on some platforms, we treat that adress as
25 * the default value for this field, and try to execute the
26 * kernel in place in such a case.
28 * Otherwise, we will return the actual value set by the user.
30 if (hdr->kernel_addr == ANDROID_IMAGE_DEFAULT_KERNEL_ADDR)
31 return (ulong)hdr + hdr->page_size;
33 return hdr->kernel_addr;
37 * android_image_get_kernel() - processes kernel part of Android boot images
38 * @hdr: Pointer to image header, which is at the start
40 * @verify: Checksum verification flag. Currently unimplemented.
41 * @os_data: Pointer to a ulong variable, will hold os data start
43 * @os_len: Pointer to a ulong variable, will hold os data length.
45 * This function returns the os image's start address and length. Also,
46 * it appends the kernel command line to the bootargs env variable.
48 * Return: Zero, os start address and length on success,
49 * otherwise on failure.
51 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
52 ulong *os_data, ulong *os_len)
54 u32 kernel_addr = android_image_get_kernel_addr(hdr);
57 * Not all Android tools use the id field for signing the image with
58 * sha1 (or anything) so we don't check it. It is not obvious that the
59 * string is null terminated so we take care of this.
61 strncpy(andr_tmp_str, hdr->name, ANDR_BOOT_NAME_SIZE);
62 andr_tmp_str[ANDR_BOOT_NAME_SIZE] = '\0';
63 if (strlen(andr_tmp_str))
64 printf("Android's image name: %s\n", andr_tmp_str);
66 printf("Kernel load addr 0x%08x size %u KiB\n",
67 kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
71 printf("Kernel command line: %s\n", hdr->cmdline);
72 len += strlen(hdr->cmdline);
75 char *bootargs = getenv("bootargs");
77 len += strlen(bootargs);
79 char *newbootargs = malloc(len + 2);
81 puts("Error: malloc in android_image_get_kernel failed!\n");
87 strcpy(newbootargs, bootargs);
88 strcat(newbootargs, " ");
91 strcat(newbootargs, hdr->cmdline);
93 setenv("bootargs", newbootargs);
96 *os_data = (ulong)hdr;
97 *os_data += hdr->page_size;
100 *os_len = hdr->kernel_size;
104 int android_image_check_header(const struct andr_img_hdr *hdr)
106 return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
109 ulong android_image_get_end(const struct andr_img_hdr *hdr)
113 * The header takes a full page, the remaining components are aligned
117 end += hdr->page_size;
118 end += ALIGN(hdr->kernel_size, hdr->page_size);
119 end += ALIGN(hdr->ramdisk_size, hdr->page_size);
120 end += ALIGN(hdr->second_size, hdr->page_size);
125 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
127 return android_image_get_kernel_addr(hdr);
130 int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
131 ulong *rd_data, ulong *rd_len)
133 if (!hdr->ramdisk_size)
136 printf("RAM disk load addr 0x%08x size %u KiB\n",
137 hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
139 *rd_data = (unsigned long)hdr;
140 *rd_data += hdr->page_size;
141 *rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
143 *rd_len = hdr->ramdisk_size;