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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2014 Broadcom Corporation.
*/
#include <config.h>
#include <common.h>
#include <blk.h>
#include <fastboot.h>
#include <fastboot-internal.h>
#include <fb_mmc.h>
#include <image-sparse.h>
#include <part.h>
#include <mmc.h>
#include <div64.h>
#include <linux/compat.h>
#include <android_image.h>
#define FASTBOOT_MAX_BLK_WRITE 16384
#define BOOT_PARTITION_NAME "boot"
struct fb_mmc_sparse {
struct blk_desc *dev_desc;
};
static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
const char *name, disk_partition_t *info)
{
int ret;
ret = part_get_info_by_name(dev_desc, name, info);
if (ret < 0) {
/* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
char env_alias_name[25 + 32 + 1];
char *aliased_part_name;
/* check for alias */
strcpy(env_alias_name, "fastboot_partition_alias_");
strncat(env_alias_name, name, 32);
aliased_part_name = env_get(env_alias_name);
if (aliased_part_name != NULL)
ret = part_get_info_by_name(dev_desc,
aliased_part_name, info);
}
return ret;
}
/**
* fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
*
* @block_dev: Pointer to block device
* @start: First block to write/erase
* @blkcnt: Count of blocks
* @buffer: Pointer to data buffer for write or NULL for erase
*/
static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
lbaint_t blkcnt, const void *buffer)
{
lbaint_t blk = start;
lbaint_t blks_written;
lbaint_t cur_blkcnt;
lbaint_t blks = 0;
int i;
for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
if (buffer) {
if (fastboot_progress_callback)
fastboot_progress_callback("writing");
blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
buffer + (i * block_dev->blksz));
} else {
if (fastboot_progress_callback)
fastboot_progress_callback("erasing");
blks_written = blk_derase(block_dev, blk, cur_blkcnt);
}
blk += blks_written;
blks += blks_written;
}
return blks;
}
static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
lbaint_t blk, lbaint_t blkcnt, const void *buffer)
{
struct fb_mmc_sparse *sparse = info->priv;
struct blk_desc *dev_desc = sparse->dev_desc;
return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
}
static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
lbaint_t blk, lbaint_t blkcnt)
{
return blkcnt;
}
static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
const char *part_name, void *buffer,
u32 download_bytes, char *response)
{
lbaint_t blkcnt;
lbaint_t blks;
/* determine number of blocks to write */
blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
blkcnt = lldiv(blkcnt, info->blksz);
if (blkcnt > info->size) {
pr_err("too large for partition: '%s'\n", part_name);
fastboot_fail("too large for partition", response);
return;
}
puts("Flashing Raw Image\n");
blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
if (blks != blkcnt) {
pr_err("failed writing to device %d\n", dev_desc->devnum);
fastboot_fail("failed writing to device", response);
return;
}
printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
part_name);
fastboot_okay(NULL, response);
}
#ifdef CONFIG_ANDROID_BOOT_IMAGE
/**
* Read Android boot image header from boot partition.
*
* @param[in] dev_desc MMC device descriptor
* @param[in] info Boot partition info
* @param[out] hdr Where to store read boot image header
*
* @return Boot image header sectors count or 0 on error
*/
static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
disk_partition_t *info,
struct andr_img_hdr *hdr,
char *response)
{
ulong sector_size; /* boot partition sector size */
lbaint_t hdr_sectors; /* boot image header sectors count */
int res;
/* Calculate boot image sectors count */
sector_size = info->blksz;
hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
if (hdr_sectors == 0) {
pr_err("invalid number of boot sectors: 0\n");
fastboot_fail("invalid number of boot sectors: 0", response);
return 0;
}
/* Read the boot image header */
res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
if (res != hdr_sectors) {
pr_err("cannot read header from boot partition\n");
fastboot_fail("cannot read header from boot partition",
response);
return 0;
}
/* Check boot header magic string */
res = android_image_check_header(hdr);
if (res != 0) {
pr_err("bad boot image magic\n");
fastboot_fail("boot partition not initialized", response);
return 0;
}
return hdr_sectors;
}
/**
* Write downloaded zImage to boot partition and repack it properly.
*
* @param dev_desc MMC device descriptor
* @param download_buffer Address to fastboot buffer with zImage in it
* @param download_bytes Size of fastboot buffer, in bytes
*
* @return 0 on success or -1 on error
*/
static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
void *download_buffer,
u32 download_bytes,
char *response)
{
uintptr_t hdr_addr; /* boot image header address */
struct andr_img_hdr *hdr; /* boot image header */
lbaint_t hdr_sectors; /* boot image header sectors */
u8 *ramdisk_buffer;
u32 ramdisk_sector_start;
u32 ramdisk_sectors;
u32 kernel_sector_start;
u32 kernel_sectors;
u32 sectors_per_page;
disk_partition_t info;
int res;
puts("Flashing zImage\n");
/* Get boot partition info */
res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
if (res < 0) {
pr_err("cannot find boot partition\n");
fastboot_fail("cannot find boot partition", response);
return -1;
}
/* Put boot image header in fastboot buffer after downloaded zImage */
hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
hdr = (struct andr_img_hdr *)hdr_addr;
/* Read boot image header */
hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
if (hdr_sectors == 0) {
pr_err("unable to read boot image header\n");
fastboot_fail("unable to read boot image header", response);
return -1;
}
/* Check if boot image has second stage in it (we don't support it) */
if (hdr->second_size > 0) {
pr_err("moving second stage is not supported yet\n");
fastboot_fail("moving second stage is not supported yet",
response);
return -1;
}
/* Extract ramdisk location */
sectors_per_page = hdr->page_size / info.blksz;
ramdisk_sector_start = info.start + sectors_per_page;
ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
sectors_per_page;
ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
sectors_per_page;
/* Read ramdisk and put it in fastboot buffer after boot image header */
ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
ramdisk_buffer);
if (res != ramdisk_sectors) {
pr_err("cannot read ramdisk from boot partition\n");
fastboot_fail("cannot read ramdisk from boot partition",
response);
return -1;
}
/* Write new kernel size to boot image header */
hdr->kernel_size = download_bytes;
res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
if (res == 0) {
pr_err("cannot writeback boot image header\n");
fastboot_fail("cannot write back boot image header", response);
return -1;
}
/* Write the new downloaded kernel */
kernel_sector_start = info.start + sectors_per_page;
kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
sectors_per_page;
res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
download_buffer);
if (res == 0) {
pr_err("cannot write new kernel\n");
fastboot_fail("cannot write new kernel", response);
return -1;
}
/* Write the saved ramdisk back */
ramdisk_sector_start = info.start + sectors_per_page;
ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
sectors_per_page;
res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
ramdisk_buffer);
if (res == 0) {
pr_err("cannot write back original ramdisk\n");
fastboot_fail("cannot write back original ramdisk", response);
return -1;
}
puts("........ zImage was updated in boot partition\n");
fastboot_okay(NULL, response);
return 0;
}
#endif
/**
* fastboot_mmc_get_part_info() - Lookup eMMC partion by name
*
* @part_name: Named partition to lookup
* @dev_desc: Pointer to returned blk_desc pointer
* @part_info: Pointer to returned disk_partition_t
* @response: Pointer to fastboot response buffer
*/
int fastboot_mmc_get_part_info(char *part_name, struct blk_desc **dev_desc,
disk_partition_t *part_info, char *response)
{
int r;
*dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (!*dev_desc) {
fastboot_fail("block device not found", response);
return -ENOENT;
}
if (!part_name || !strcmp(part_name, "")) {
fastboot_fail("partition not given", response);
return -ENOENT;
}
r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info);
if (r < 0) {
fastboot_fail("partition not found", response);
return r;
}
return r;
}
/**
* fastboot_mmc_flash_write() - Write image to eMMC for fastboot
*
* @cmd: Named partition to write image to
* @download_buffer: Pointer to image data
* @download_bytes: Size of image data
* @response: Pointer to fastboot response buffer
*/
void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
u32 download_bytes, char *response)
{
struct blk_desc *dev_desc;
disk_partition_t info;
dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
pr_err("invalid mmc device\n");
fastboot_fail("invalid mmc device", response);
return;
}
#if CONFIG_IS_ENABLED(EFI_PARTITION)
if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
printf("%s: updating MBR, Primary and Backup GPT(s)\n",
__func__);
if (is_valid_gpt_buf(dev_desc, download_buffer)) {
printf("%s: invalid GPT - refusing to write to flash\n",
__func__);
fastboot_fail("invalid GPT partition", response);
return;
}
if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
printf("%s: writing GPT partitions failed\n", __func__);
fastboot_fail("writing GPT partitions failed",
response);
return;
}
printf("........ success\n");
fastboot_okay(NULL, response);
return;
}
#endif
#if CONFIG_IS_ENABLED(DOS_PARTITION)
if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
printf("%s: updating MBR\n", __func__);
if (is_valid_dos_buf(download_buffer)) {
printf("%s: invalid MBR - refusing to write to flash\n",
__func__);
fastboot_fail("invalid MBR partition", response);
return;
}
if (write_mbr_partition(dev_desc, download_buffer)) {
printf("%s: writing MBR partition failed\n", __func__);
fastboot_fail("writing MBR partition failed",
response);
return;
}
printf("........ success\n");
fastboot_okay(NULL, response);
return;
}
#endif
#ifdef CONFIG_ANDROID_BOOT_IMAGE
if (strncasecmp(cmd, "zimage", 6) == 0) {
fb_mmc_update_zimage(dev_desc, download_buffer,
download_bytes, response);
return;
}
#endif
if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
pr_err("cannot find partition: '%s'\n", cmd);
fastboot_fail("cannot find partition", response);
return;
}
if (is_sparse_image(download_buffer)) {
struct fb_mmc_sparse sparse_priv;
struct sparse_storage sparse;
int err;
sparse_priv.dev_desc = dev_desc;
sparse.blksz = info.blksz;
sparse.start = info.start;
sparse.size = info.size;
sparse.write = fb_mmc_sparse_write;
sparse.reserve = fb_mmc_sparse_reserve;
sparse.mssg = fastboot_fail;
printf("Flashing sparse image at offset " LBAFU "\n",
sparse.start);
sparse.priv = &sparse_priv;
err = write_sparse_image(&sparse, cmd, download_buffer,
response);
if (!err)
fastboot_okay(NULL, response);
} else {
write_raw_image(dev_desc, &info, cmd, download_buffer,
download_bytes, response);
}
}
/**
* fastboot_mmc_flash_erase() - Erase eMMC for fastboot
*
* @cmd: Named partition to erase
* @response: Pointer to fastboot response buffer
*/
void fastboot_mmc_erase(const char *cmd, char *response)
{
int ret;
struct blk_desc *dev_desc;
disk_partition_t info;
lbaint_t blks, blks_start, blks_size, grp_size;
struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (mmc == NULL) {
pr_err("invalid mmc device\n");
fastboot_fail("invalid mmc device", response);
return;
}
dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
pr_err("invalid mmc device\n");
fastboot_fail("invalid mmc device", response);
return;
}
ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);
if (ret < 0) {
pr_err("cannot find partition: '%s'\n", cmd);
fastboot_fail("cannot find partition", response);
return;
}
/* Align blocks to erase group size to avoid erasing other partitions */
grp_size = mmc->erase_grp_size;
blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
if (info.size >= grp_size)
blks_size = (info.size - (blks_start - info.start)) &
(~(grp_size - 1));
else
blks_size = 0;
printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
blks_start, blks_start + blks_size);
blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
if (blks != blks_size) {
pr_err("failed erasing from device %d\n", dev_desc->devnum);
fastboot_fail("failed erasing from device", response);
return;
}
printf("........ erased " LBAFU " bytes from '%s'\n",
blks_size * info.blksz, cmd);
fastboot_okay(NULL, response);
}
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