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// SPDX-License-Identifier: GPL-2.0
/*
* Verified Boot for Embedded (VBE) loading firmware phases
*
* Copyright 2022 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY LOGC_BOOT
#include <common.h>
#include <bloblist.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <bootstage.h>
#include <dm.h>
#include <image.h>
#include <log.h>
#include <mapmem.h>
#include <memalign.h>
#include <mmc.h>
#include <spl.h>
#include <vbe.h>
#include <dm/device-internal.h>
#include "vbe_simple.h"
/**
* vbe_simple_read_bootflow_fw() - Create a bootflow for firmware
*
* Locates and loads the firmware image (FIT) needed for the next phase. The FIT
* should ideally use external data, to reduce the amount of it that needs to be
* read.
*
* @bdev: bootdev device containing the firmwre
* @meth: VBE simple bootmeth
* @blow: Place to put the created bootflow, on success
* @return 0 if OK, -ve on error
*/
int vbe_simple_read_bootflow_fw(struct udevice *dev, struct bootflow *bflow)
{
ALLOC_CACHE_ALIGN_BUFFER(u8, sbuf, MMC_MAX_BLOCK_LEN);
struct udevice *media = dev_get_parent(bflow->dev);
struct udevice *meth = bflow->method;
struct simple_priv *priv = dev_get_priv(meth);
const char *fit_uname, *fit_uname_config;
struct bootm_headers images = {};
ulong offset, size, blknum, addr, len, load_addr, num_blks;
enum image_phase_t phase;
struct blk_desc *desc;
struct udevice *blk;
int node, ret;
void *buf;
log_debug("media=%s\n", media->name);
ret = blk_get_from_parent(media, &blk);
if (ret)
return log_msg_ret("med", ret);
log_debug("blk=%s\n", blk->name);
desc = dev_get_uclass_plat(blk);
offset = priv->area_start + priv->skip_offset;
/* read in one block to find the FIT size */
blknum = offset / desc->blksz;
log_debug("read at %lx, blknum %lx\n", 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 > priv->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 = (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);
}
/* set up the bootflow with the info we obtained */
bflow->name = strdup(fdt_get_name(buf, node, NULL));
if (!bflow->name)
return log_msg_ret("name", -ENOMEM);
bflow->blk = blk;
bflow->buf = map_sysmem(load_addr, len);
bflow->size = len;
return 0;
}
static int simple_load_from_image(struct spl_image_info *spl_image,
struct spl_boot_device *bootdev)
{
struct udevice *meth, *bdev;
struct simple_priv *priv;
struct bootflow bflow;
struct vbe_handoff *handoff;
int ret;
if (spl_phase() != PHASE_VPL && spl_phase() != PHASE_SPL)
return -ENOENT;
ret = bloblist_ensure_size(BLOBLISTT_VBE, sizeof(struct vbe_handoff),
0, (void **)&handoff);
if (ret)
return log_msg_ret("ro", ret);
vbe_find_first_device(&meth);
if (!meth)
return log_msg_ret("vd", -ENODEV);
log_debug("vbe dev %s\n", meth->name);
ret = device_probe(meth);
if (ret)
return log_msg_ret("probe", ret);
priv = dev_get_priv(meth);
log_debug("simple %s\n", priv->storage);
ret = bootdev_find_by_label(priv->storage, &bdev, NULL);
if (ret)
return log_msg_ret("bd", ret);
log_debug("bootdev %s\n", bdev->name);
bootflow_init(&bflow, bdev, meth);
ret = bootmeth_read_bootflow(meth, &bflow);
log_debug("\nfw ret=%d\n", ret);
if (ret)
return log_msg_ret("rd", ret);
/* jump to the image */
spl_image->flags = SPL_SANDBOXF_ARG_IS_BUF;
spl_image->arg = bflow.buf;
spl_image->size = bflow.size;
log_debug("Image: %s at %p size %x\n", bflow.name, bflow.buf,
bflow.size);
/* this is not used from now on, so free it */
bootflow_free(&bflow);
/* Record that VBE was used in this phase */
handoff->phases |= 1 << spl_phase();
return 0;
}
SPL_LOAD_IMAGE_METHOD("vbe_simple", 5, BOOT_DEVICE_VBE,
simple_load_from_image);
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