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// SPDX-License-Identifier: GPL-2.0
/*
* Verified Boot for Embedded (VBE) common functions
*
* Copyright 2024 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#include <bootstage.h>
#include <dm.h>
#include <blk.h>
#include <image.h>
#include <mapmem.h>
#include <memalign.h>
#include <spl.h>
#include <u-boot/crc.h>
#include "vbe_common.h"
int vbe_get_blk(const char *storage, struct udevice **blkp)
{
struct blk_desc *desc;
char devname[16];
const char *end;
int devnum;
/* First figure out the block device */
log_debug("storage=%s\n", storage);
devnum = trailing_strtoln_end(storage, NULL, &end);
if (devnum == -1)
return log_msg_ret("num", -ENODEV);
if (end - storage >= sizeof(devname))
return log_msg_ret("end", -E2BIG);
strlcpy(devname, storage, end - storage + 1);
log_debug("dev=%s, %x\n", devname, devnum);
desc = blk_get_dev(devname, devnum);
if (!desc)
return log_msg_ret("get", -ENXIO);
*blkp = desc->bdev;
return 0;
}
int vbe_read_version(struct udevice *blk, ulong offset, char *version,
int max_size)
{
ALLOC_CACHE_ALIGN_BUFFER(u8, buf, MMC_MAX_BLOCK_LEN);
/* we can use an assert() here since we already read only one block */
assert(max_size <= MMC_MAX_BLOCK_LEN);
/*
* we can use an assert() here since reading the wrong block will just
* cause an invalid version-string to be (safely) read
*/
assert(!(offset & (MMC_MAX_BLOCK_LEN - 1)));
offset /= MMC_MAX_BLOCK_LEN;
if (blk_read(blk, offset, 1, buf) != 1)
return log_msg_ret("read", -EIO);
strlcpy(version, buf, max_size);
log_debug("version=%s\n", version);
return 0;
}
int vbe_read_nvdata(struct udevice *blk, ulong offset, ulong size, u8 *buf)
{
uint hdr_ver, hdr_size, data_size, crc;
const struct vbe_nvdata *nvd;
/* we can use an assert() here since we already read only one block */
assert(size <= MMC_MAX_BLOCK_LEN);
/*
* We can use an assert() here since reading the wrong block will just
* cause invalid state to be (safely) read. If the crc passes, then we
* obtain invalid state and it will likely cause booting to fail.
*
* VBE relies on valid values being in U-Boot's devicetree, so this
* should not every be wrong on a production device.
*/
assert(!(offset & (MMC_MAX_BLOCK_LEN - 1)));
if (offset & (MMC_MAX_BLOCK_LEN - 1))
return log_msg_ret("get", -EBADF);
offset /= MMC_MAX_BLOCK_LEN;
if (blk_read(blk, offset, 1, buf) != 1)
return log_msg_ret("read", -EIO);
nvd = (struct vbe_nvdata *)buf;
hdr_ver = (nvd->hdr & NVD_HDR_VER_MASK) >> NVD_HDR_VER_SHIFT;
hdr_size = (nvd->hdr & NVD_HDR_SIZE_MASK) >> NVD_HDR_SIZE_SHIFT;
if (hdr_ver != NVD_HDR_VER_CUR)
return log_msg_ret("hdr", -EPERM);
data_size = 1 << hdr_size;
if (!data_size || data_size > sizeof(*nvd))
return log_msg_ret("sz", -EPERM);
crc = crc8(0, buf + 1, data_size - 1);
if (crc != nvd->crc8)
return log_msg_ret("crc", -EPERM);
return 0;
}
int vbe_read_fit(struct udevice *blk, ulong area_offset, ulong area_size,
ulong *load_addrp, ulong *lenp, char **namep)
{
ALLOC_CACHE_ALIGN_BUFFER(u8, sbuf, MMC_MAX_BLOCK_LEN);
ulong size, blknum, addr, len, load_addr, num_blks;
const char *fit_uname, *fit_uname_config;
struct bootm_headers images = {};
enum image_phase_t phase;
struct blk_desc *desc;
int node, ret;
void *buf;
desc = dev_get_uclass_plat(blk);
/* read in one block to find the FIT size */
blknum = area_offset / desc->blksz;
log_debug("read at %lx, blknum %lx\n", area_offset, blknum);
ret = blk_read(blk, blknum, 1, sbuf);
if (ret < 0)
return log_msg_ret("rd", ret);
ret = fdt_check_header(sbuf);
if (ret < 0)
return log_msg_ret("fdt", -EINVAL);
size = fdt_totalsize(sbuf);
if (size > area_size)
return log_msg_ret("fdt", -E2BIG);
log_debug("FIT size %lx\n", size);
/*
* Load the FIT into the SPL memory. This is typically a FIT with
* external data, so this is quite small, perhaps a few KB.
*/
addr = CONFIG_VAL(TEXT_BASE);
buf = map_sysmem(addr, size);
num_blks = DIV_ROUND_UP(size, desc->blksz);
log_debug("read %lx, %lx blocks to %lx / %p\n", size, num_blks, addr,
buf);
ret = blk_read(blk, blknum, num_blks, buf);
if (ret < 0)
return log_msg_ret("rd", ret);
/* figure out the phase to load */
phase = IS_ENABLED(CONFIG_VPL_BUILD) ? IH_PHASE_SPL : IH_PHASE_U_BOOT;
/*
* Load the image from the FIT. We ignore any load-address information
* so in practice this simply locates the image in the external-data
* region and returns its address and size. Since we only loaded the FIT
* itself, only a part of the image will be present, at best.
*/
fit_uname = NULL;
fit_uname_config = NULL;
log_debug("loading FIT\n");
ret = fit_image_load(&images, addr, &fit_uname, &fit_uname_config,
IH_ARCH_SANDBOX, image_ph(phase, IH_TYPE_FIRMWARE),
BOOTSTAGE_ID_FIT_SPL_START, FIT_LOAD_IGNORED,
&load_addr, &len);
if (ret < 0)
return log_msg_ret("ld", ret);
node = ret;
log_debug("loaded to %lx\n", load_addr);
/* For FIT external data, read in the external data */
if (load_addr + len > addr + size) {
ulong base, full_size;
void *base_buf;
/* Find the start address to load from */
base = ALIGN_DOWN(load_addr, desc->blksz);
/*
* Get the total number of bytes to load, taking care of
* block alignment
*/
full_size = load_addr + len - base;
/*
* Get the start block number, number of blocks and the address
* to load to, then load the blocks
*/
blknum = (area_offset + base - addr) / desc->blksz;
num_blks = DIV_ROUND_UP(full_size, desc->blksz);
base_buf = map_sysmem(base, full_size);
ret = blk_read(blk, blknum, num_blks, base_buf);
log_debug("read %lx %lx, %lx blocks to %lx / %p: ret=%d\n",
blknum, full_size, num_blks, base, base_buf, ret);
if (ret < 0)
return log_msg_ret("rd", ret);
}
if (load_addrp)
*load_addrp = load_addr;
if (lenp)
*lenp = len;
if (namep) {
*namep = strdup(fdt_get_name(buf, node, NULL));
if (!namep)
return log_msg_ret("nam", -ENOMEM);
}
return 0;
}
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