image-android.c
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/*
* Copyright (c) 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <image.h>
#include <android_image.h>
#include <malloc.h>
#include <errno.h>
#include <asm/bootm.h>
#define ANDROID_IMAGE_DEFAULT_KERNEL_ADDR 0x10008000
static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
static ulong android_image_get_kernel_addr(const struct andr_img_hdr *hdr)
{
/*
* All the Android tools that generate a boot.img use this
* address as the default.
*
* Even though it doesn't really make a lot of sense, and it
* might be valid on some platforms, we treat that adress as
* the default value for this field, and try to execute the
* kernel in place in such a case.
*
* Otherwise, we will return the actual value set by the user.
*/
if (hdr->kernel_addr == ANDROID_IMAGE_DEFAULT_KERNEL_ADDR)
return (ulong)hdr + hdr->page_size;
return hdr->kernel_addr;
}
/**
* android_image_get_kernel() - processes kernel part of Android boot images
* @hdr: Pointer to image header, which is at the start
* of the image.
* @verify: Checksum verification flag. Currently unimplemented.
* @os_data: Pointer to a ulong variable, will hold os data start
* address.
* @os_len: Pointer to a ulong variable, will hold os data length.
*
* This function returns the os image's start address and length. Also,
* it appends the kernel command line to the bootargs env variable.
*
* Return: Zero, os start address and length on success,
* otherwise on failure.
*/
int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
ulong *os_data, ulong *os_len)
{
u32 kernel_addr = android_image_get_kernel_addr(hdr);
/*
* Not all Android tools use the id field for signing the image with
* sha1 (or anything) so we don't check it. It is not obvious that the
* string is null terminated so we take care of this.
*/
strncpy(andr_tmp_str, hdr->name, ANDR_BOOT_NAME_SIZE);
andr_tmp_str[ANDR_BOOT_NAME_SIZE] = '\0';
if (strlen(andr_tmp_str))
printf("Android's image name: %s\n", andr_tmp_str);
printf("Kernel load addr 0x%08x size %u KiB\n",
kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
int len = 0;
if (*hdr->cmdline) {
len += strlen(hdr->cmdline);
}
char *bootargs = getenv("bootargs");
if (bootargs)
len += strlen(bootargs);
char *newbootargs = malloc(len + 2);
if (!newbootargs) {
puts("Error: malloc in android_image_get_kernel failed!\n");
return -ENOMEM;
}
*newbootargs = '\0';
if (bootargs) {
strcpy(newbootargs, bootargs);
} else if (*hdr->cmdline) {
strcat(newbootargs, hdr->cmdline);
}
printf("Kernel command line: %s\n", newbootargs);
#ifdef CONFIG_SERIAL_TAG
struct tag_serialnr serialnr;
char commandline[ANDR_BOOT_ARGS_SIZE];
get_board_serial(&serialnr);
sprintf(commandline,
"%s androidboot.serialno=%08x%08x",
newbootargs,
serialnr.high,
serialnr.low);
setenv("bootargs", commandline);
#else
setenv("bootargs", newbootargs);
#endif
if (os_data) {
*os_data = (ulong)hdr;
*os_data += hdr->page_size;
}
if (os_len)
*os_len = hdr->kernel_size;
return 0;
}
int android_image_check_header(const struct andr_img_hdr *hdr)
{
return memcmp(ANDR_BOOT_MAGIC, hdr->magic, ANDR_BOOT_MAGIC_SIZE);
}
ulong android_image_get_end(const struct andr_img_hdr *hdr)
{
ulong end;
/*
* The header takes a full page, the remaining components are aligned
* on page boundary
*/
end = (ulong)hdr;
end += hdr->page_size;
end += ALIGN(hdr->kernel_size, hdr->page_size);
end += ALIGN(hdr->ramdisk_size, hdr->page_size);
end += ALIGN(hdr->second_size, hdr->page_size);
return end;
}
ulong android_image_get_kload(const struct andr_img_hdr *hdr)
{
return android_image_get_kernel_addr(hdr);
}
int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
ulong *rd_data, ulong *rd_len)
{
if (!hdr->ramdisk_size) {
*rd_data = *rd_len = 0;
return -1;
}
printf("RAM disk load addr 0x%08x size %u KiB\n",
hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
*rd_data = (unsigned long)hdr;
*rd_data += hdr->page_size;
*rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
*rd_len = hdr->ramdisk_size;
return 0;
}
int android_image_get_fdt(const struct andr_img_hdr *hdr,
ulong *fdt_data, ulong *fdt_len)
{
if (!hdr->second_size)
return -1;
printf("FDT load addr 0x%08x size %u KiB\n",
hdr->second_addr, DIV_ROUND_UP(hdr->second_size, 1024));
*fdt_data = (unsigned long)hdr;
*fdt_data += hdr->page_size;
*fdt_data += ALIGN(hdr->kernel_size, hdr->page_size);
*fdt_data += ALIGN(hdr->ramdisk_size, hdr->page_size);
*fdt_len = hdr->second_size;
return 0;
}