899d13d0df
A new CBFS API is introduced to allow making CBFS access easier for providing multiple CBFS sources. That is achieved by decoupling the cbfs source from a CBFS file. A CBFS source is described by a descriptor. It contains the necessary properties for walking a CBFS to locate a file. The CBFS file is then decoupled from the CBFS descriptor in that it's no longer needed to access the contents of the file. All of this is accomplished using the regions infrastructure by repsenting CBFS sources and files as region_devices. Because region_devices can be chained together forming subregions this allows one to decouple a CBFS source from a file. This also allows one to provide CBFS files that came from other sources for payload and/or stage loading. The program loading takes advantage of those very properties by allowing multiple sources for locating a program. Because of this we can reduce the overhead of loading programs because it's all done in the common code paths. Only locating the program is per source. Change-Id: I339b84fce95f03d1dbb63a0f54a26be5eb07f7c8 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9134 Tested-by: build bot (Jenkins) Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.
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*/
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/*
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* This file provides a common CBFS wrapper for SPI storage. SPI driver
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* context is expanded with the buffer descriptor used to store data read from
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* SPI.
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*/
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#include <boot_device.h>
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#include <spi_flash.h>
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#include <symbols.h>
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static struct spi_flash *spi_flash_info;
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static ssize_t spi_readat(const struct region_device *rd, void *b,
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size_t offset, size_t size)
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{
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if (spi_flash_info->read(spi_flash_info, offset, size, b))
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return -1;
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return size;
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}
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static const struct region_device_ops spi_ops = {
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.mmap = mmap_helper_rdev_mmap,
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.munmap = mmap_helper_rdev_munmap,
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.readat = spi_readat,
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};
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static struct mmap_helper_region_device mdev =
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MMAP_HELPER_REGION_INIT(&spi_ops, 0, CONFIG_ROM_SIZE);
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void boot_device_init(void)
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{
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int bus = CONFIG_BOOT_MEDIA_SPI_BUS;
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int cs = 0;
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if (spi_flash_info != NULL)
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return;
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spi_flash_info = spi_flash_probe(bus, cs);
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mmap_helper_device_init(&mdev, _cbfs_cache, _cbfs_cache_size);
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}
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/* Return the CBFS boot device. */
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const struct region_device *boot_device_ro(void)
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{
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if (spi_flash_info == NULL)
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return NULL;
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return &mdev.rdev;
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}
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