8563672933
Loading a FIT is useful for other VBE methods, such as ABrec. Create a new function to handling reading it. Signed-off-by: Simon Glass <sjg@chromium.org>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Verified Boot for Embedded (VBE) loading firmware phases
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*
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* Copyright 2022 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY LOGC_BOOT
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#include <bloblist.h>
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#include <bootdev.h>
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#include <bootflow.h>
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#include <bootmeth.h>
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#include <bootstage.h>
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#include <dm.h>
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#include <image.h>
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#include <log.h>
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#include <mapmem.h>
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#include <memalign.h>
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#include <mmc.h>
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#include <spl.h>
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#include <vbe.h>
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#include <dm/device-internal.h>
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#include "vbe_simple.h"
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/**
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* vbe_simple_read_bootflow_fw() - Create a bootflow for firmware
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*
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* Locates and loads the firmware image (FIT) needed for the next phase. The FIT
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* should ideally use external data, to reduce the amount of it that needs to be
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* read.
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*
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* @bdev: bootdev device containing the firmwre
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* @meth: VBE simple bootmeth
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* @blow: Place to put the created bootflow, on success
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* @return 0 if OK, -ve on error
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*/
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int vbe_simple_read_bootflow_fw(struct udevice *dev, struct bootflow *bflow)
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{
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struct udevice *media = dev_get_parent(bflow->dev);
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struct udevice *meth = bflow->method;
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struct simple_priv *priv = dev_get_priv(meth);
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ulong len, load_addr;
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struct udevice *blk;
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int ret;
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log_debug("media=%s\n", media->name);
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ret = blk_get_from_parent(media, &blk);
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if (ret)
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return log_msg_ret("med", ret);
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log_debug("blk=%s\n", blk->name);
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ret = vbe_read_fit(blk, priv->area_start + priv->skip_offset,
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priv->area_size, &load_addr, &len, &bflow->name);
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/* set up the bootflow with the info we obtained */
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bflow->blk = blk;
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bflow->buf = map_sysmem(load_addr, len);
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bflow->size = len;
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return 0;
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}
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static int simple_load_from_image(struct spl_image_info *spl_image,
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struct spl_boot_device *bootdev)
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{
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struct udevice *meth, *bdev;
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struct simple_priv *priv;
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struct bootflow bflow;
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struct vbe_handoff *handoff;
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int ret;
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if (xpl_phase() != PHASE_VPL && xpl_phase() != PHASE_SPL)
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return -ENOENT;
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ret = bloblist_ensure_size(BLOBLISTT_VBE, sizeof(struct vbe_handoff),
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0, (void **)&handoff);
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if (ret)
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return log_msg_ret("ro", ret);
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vbe_find_first_device(&meth);
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if (!meth)
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return log_msg_ret("vd", -ENODEV);
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log_debug("vbe dev %s\n", meth->name);
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ret = device_probe(meth);
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if (ret)
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return log_msg_ret("probe", ret);
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priv = dev_get_priv(meth);
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log_debug("simple %s\n", priv->storage);
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ret = bootdev_find_by_label(priv->storage, &bdev, NULL);
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if (ret)
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return log_msg_ret("bd", ret);
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log_debug("bootdev %s\n", bdev->name);
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bootflow_init(&bflow, bdev, meth);
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ret = bootmeth_read_bootflow(meth, &bflow);
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log_debug("\nfw ret=%d\n", ret);
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if (ret)
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return log_msg_ret("rd", ret);
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/* jump to the image */
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spl_image->flags = SPL_SANDBOXF_ARG_IS_BUF;
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spl_image->arg = bflow.buf;
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spl_image->size = bflow.size;
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log_debug("Image: %s at %p size %x\n", bflow.name, bflow.buf,
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bflow.size);
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/* this is not used from now on, so free it */
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bootflow_free(&bflow);
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/* Record that VBE was used in this phase */
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handoff->phases |= 1 << xpl_phase();
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return 0;
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}
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SPL_LOAD_IMAGE_METHOD("vbe_simple", 5, BOOT_DEVICE_VBE,
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simple_load_from_image);
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