2 * Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <android_image.h>
13 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
16 * android_image_get_kernel() - processes kernel part of Android boot images
17 * @hdr: Pointer to image header, which is at the start
19 * @verify: Checksum verification flag. Currently unimplemented.
20 * @os_data: Pointer to a ulong variable, will hold os data start
22 * @os_len: Pointer to a ulong variable, will hold os data length.
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.
27 * Return: Zero, os start address and length on success,
28 * otherwise on failure.
30 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
31 ulong *os_data, ulong *os_len)
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.
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);
43 printf("Kernel load addr 0x%08x size %u KiB\n",
44 hdr->kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
48 printf("Kernel command line: %s\n", hdr->cmdline);
49 len += strlen(hdr->cmdline);
52 char *bootargs = getenv("bootargs");
54 len += strlen(bootargs);
56 char *newbootargs = malloc(len + 2);
58 puts("Error: malloc in android_image_get_kernel failed!\n");
64 strcpy(newbootargs, bootargs);
65 strcat(newbootargs, " ");
68 strcat(newbootargs, hdr->cmdline);
70 setenv("bootargs", newbootargs);
73 *os_data = (ulong)hdr;
74 *os_data += hdr->page_size;
77 *os_len = hdr->kernel_size;
81 int android_image_check_header(const struct andr_img_hdr *hdr)
83 return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
86 ulong android_image_get_end(const struct andr_img_hdr *hdr)
90 * The header takes a full page, the remaining components are aligned
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);
102 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
104 return hdr->kernel_addr;
107 int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
108 ulong *rd_data, ulong *rd_len)
110 if (!hdr->ramdisk_size)
113 printf("RAM disk load addr 0x%08x size %u KiB\n",
114 hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
116 *rd_data = (unsigned long)hdr;
117 *rd_data += hdr->page_size;
118 *rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
120 *rd_len = hdr->ramdisk_size;