76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 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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#include <boot_device.h>
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#include <console/console.h>
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#include <cbfs.h>
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#include <endian.h>
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#include <stdlib.h>
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/* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */
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#define rom_base ((void *)(uintptr_t)(-(int32_t)CONFIG_ROM_SIZE))
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static const struct mem_region_device boot_dev =
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MEM_REGION_DEV_INIT(rom_base, CONFIG_ROM_SIZE);
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const struct region_device *boot_device_ro(void)
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{
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return &boot_dev.rdev;
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}
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int cbfs_boot_region_properties(struct cbfs_props *props)
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{
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struct cbfs_header header;
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int32_t offset;
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const struct region_device *bdev;
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bdev = boot_device_ro();
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rdev_readat(bdev, &offset, CONFIG_ROM_SIZE - sizeof(offset),
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sizeof(offset));
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/* The offset is relative to the end of the media. */
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offset += CONFIG_ROM_SIZE;
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rdev_readat(bdev, &header , offset, sizeof(header));
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header.magic = ntohl(header.magic);
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header.romsize = ntohl(header.romsize);
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header.bootblocksize = ntohl(header.bootblocksize);
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header.align = ntohl(header.align);
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header.offset = ntohl(header.offset);
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if (header.magic != CBFS_HEADER_MAGIC)
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return -1;
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props->align = header.align;
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props->offset = header.offset;
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if (CONFIG_ROM_SIZE != header.romsize)
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props->size = CONFIG_ROM_SIZE;
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else
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props->size = header.romsize;
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props->size -= props->offset;
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props->size -= header.bootblocksize;
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props->size = ALIGN_DOWN(props->size, props->align);
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printk(BIOS_DEBUG, "CBFS @ %zx size %zx\n", props->offset, props->size);
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return 0;
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}
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