mirror of
https://github.com/AsahiLinux/u-boot
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d9f48579dc
These are associated with the ethernet boot device but do not match its uclass name, so handle them as special cases. Provide a way to pass flags through with the bootdev so that we know how to process it. The flags are checked by the bootmeths, to ensure that only the selected bootmeth is used. While these both use the network device, they work quite differently. It is common to run only one of these, or to run PXE before DHCP. Provide bootflow flags to control which methods are used. Check these in the two bootmeths so that only the chosen one is used. Signed-off-by: Simon Glass <sjg@chromium.org>
206 lines
5.8 KiB
C
206 lines
5.8 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 <common.h>
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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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ALLOC_CACHE_ALIGN_BUFFER(u8, sbuf, MMC_MAX_BLOCK_LEN);
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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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const char *fit_uname, *fit_uname_config;
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struct bootm_headers images = {};
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ulong offset, size, blknum, addr, len, load_addr, num_blks;
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enum image_phase_t phase;
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struct blk_desc *desc;
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struct udevice *blk;
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int node, ret;
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void *buf;
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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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desc = dev_get_uclass_plat(blk);
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offset = priv->area_start + priv->skip_offset;
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/* read in one block to find the FIT size */
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blknum = offset / desc->blksz;
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log_debug("read at %lx, blknum %lx\n", offset, blknum);
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ret = blk_read(blk, blknum, 1, sbuf);
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if (ret < 0)
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return log_msg_ret("rd", ret);
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ret = fdt_check_header(sbuf);
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if (ret < 0)
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return log_msg_ret("fdt", -EINVAL);
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size = fdt_totalsize(sbuf);
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if (size > priv->area_size)
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return log_msg_ret("fdt", -E2BIG);
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log_debug("FIT size %lx\n", size);
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/*
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* Load the FIT into the SPL memory. This is typically a FIT with
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* external data, so this is quite small, perhaps a few KB.
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*/
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addr = CONFIG_VAL(TEXT_BASE);
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buf = map_sysmem(addr, size);
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num_blks = DIV_ROUND_UP(size, desc->blksz);
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log_debug("read %lx, %lx blocks to %lx / %p\n", size, num_blks, addr,
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buf);
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ret = blk_read(blk, blknum, num_blks, buf);
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if (ret < 0)
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return log_msg_ret("rd", ret);
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/* figure out the phase to load */
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phase = IS_ENABLED(CONFIG_VPL_BUILD) ? IH_PHASE_SPL : IH_PHASE_U_BOOT;
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/*
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* Load the image from the FIT. We ignore any load-address information
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* so in practice this simply locates the image in the external-data
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* region and returns its address and size. Since we only loaded the FIT
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* itself, only a part of the image will be present, at best.
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*/
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fit_uname = NULL;
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fit_uname_config = NULL;
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log_debug("loading FIT\n");
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ret = fit_image_load(&images, addr, &fit_uname, &fit_uname_config,
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IH_ARCH_SANDBOX, image_ph(phase, IH_TYPE_FIRMWARE),
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BOOTSTAGE_ID_FIT_SPL_START, FIT_LOAD_IGNORED,
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&load_addr, &len);
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if (ret < 0)
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return log_msg_ret("ld", ret);
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node = ret;
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log_debug("loaded to %lx\n", load_addr);
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/* For FIT external data, read in the external data */
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if (load_addr + len > addr + size) {
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ulong base, full_size;
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void *base_buf;
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/* Find the start address to load from */
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base = ALIGN_DOWN(load_addr, desc->blksz);
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/*
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* Get the total number of bytes to load, taking care of
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* block alignment
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*/
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full_size = load_addr + len - base;
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/*
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* Get the start block number, number of blocks and the address
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* to load to, then load the blocks
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*/
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blknum = (offset + base - addr) / desc->blksz;
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num_blks = DIV_ROUND_UP(full_size, desc->blksz);
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base_buf = map_sysmem(base, full_size);
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ret = blk_read(blk, blknum, num_blks, base_buf);
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log_debug("read %lx %lx, %lx blocks to %lx / %p: ret=%d\n",
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blknum, full_size, num_blks, base, base_buf, ret);
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if (ret < 0)
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return log_msg_ret("rd", ret);
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}
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/* set up the bootflow with the info we obtained */
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bflow->name = strdup(fdt_get_name(buf, node, NULL));
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if (!bflow->name)
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return log_msg_ret("name", -ENOMEM);
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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 (spl_phase() != PHASE_VPL && spl_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 << spl_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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