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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 <binman_sym.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 <mmc.h>
#include <spl.h>
#include <vbe.h>
#include <dm/device-internal.h>
#include "vbe_common.h"
#include "vbe_simple.h"
#ifdef CONFIG_BOOTMETH_VBE_SIMPLE
binman_sym_extern(ulong, vbe_a, image_pos);
binman_sym_extern(ulong, vbe_a, size);
#else
binman_sym_declare(ulong, vbe_a, image_pos);
binman_sym_declare(ulong, vbe_a, size);
#endif
binman_sym_declare(ulong, vpl, image_pos);
binman_sym_declare(ulong, vpl, size);
/**
* 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)
{
struct udevice *media = dev_get_parent(bflow->dev);
struct udevice *meth = bflow->method;
struct simple_priv *priv = dev_get_priv(meth);
ulong len, load_addr;
struct udevice *blk;
int ret;
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);
ret = vbe_read_fit(blk, priv->area_start + priv->skip_offset,
priv->area_size, NULL, &load_addr, &len,
&bflow->name);
if (ret)
return log_msg_ret("vbe", ret);
/* set up the bootflow with the info we obtained */
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 *image,
struct spl_boot_device *bootdev)
{
struct vbe_handoff *handoff;
int ret;
if (xpl_phase() != PHASE_VPL && xpl_phase() != PHASE_SPL &&
xpl_phase() != PHASE_TPL)
return -ENOENT;
ret = bloblist_ensure_size(BLOBLISTT_VBE, sizeof(struct vbe_handoff),
0, (void **)&handoff);
if (ret)
return log_msg_ret("ro", ret);
if (USE_BOOTMETH) {
struct udevice *meth, *bdev;
struct simple_priv *priv;
struct bootflow bflow;
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 */
image->flags = SPL_SANDBOXF_ARG_IS_BUF;
image->arg = bflow.buf;
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);
} else {
struct udevice *media, *blk;
ulong offset, size;
ret = uclass_get_device_by_seq(UCLASS_MMC, 1, &media);
if (ret)
return log_msg_ret("vdv", ret);
ret = blk_get_from_parent(media, &blk);
if (ret)
return log_msg_ret("med", ret);
if (xpl_phase() == PHASE_TPL) {
offset = binman_sym(ulong, vpl, image_pos);
size = binman_sym(ulong, vpl, size);
} else {
offset = binman_sym(ulong, vbe_a, image_pos);
size = binman_sym(ulong, vbe_a, size);
printf("offset=%lx\n", offset);
}
ret = vbe_read_fit(blk, offset, size, image, NULL, NULL, NULL);
if (ret)
return log_msg_ret("vbe", ret);
}
/* Record that VBE was used in this phase */
handoff->phases |= 1 << xpl_phase();
return 0;
}
SPL_LOAD_IMAGE_METHOD("vbe_simple", 5, BOOT_DEVICE_VBE,
simple_load_from_image);
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