diff options
Diffstat (limited to 'src/arch/x86/mmap_boot.c')
-rw-r--r-- | src/arch/x86/mmap_boot.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/arch/x86/mmap_boot.c b/src/arch/x86/mmap_boot.c new file mode 100644 index 0000000000..4dd269b772 --- /dev/null +++ b/src/arch/x86/mmap_boot.c @@ -0,0 +1,75 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc. + */ + +#include <boot_device.h> +#include <console/console.h> +#include <cbfs.h> +#include <endian.h> +#include <stdlib.h> + +/* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */ +#define rom_base ((void *)(uintptr_t)(-(int32_t)CONFIG_ROM_SIZE)) + +static const struct mem_region_device boot_dev = + MEM_REGION_DEV_INIT(rom_base, CONFIG_ROM_SIZE); + +const struct region_device *boot_device_ro(void) +{ + return &boot_dev.rdev; +} + +int cbfs_boot_region_properties(struct cbfs_props *props) +{ + struct cbfs_header header; + int32_t offset; + const struct region_device *bdev; + + bdev = boot_device_ro(); + + rdev_readat(bdev, &offset, CONFIG_ROM_SIZE - sizeof(offset), + sizeof(offset)); + + /* The offset is relative to the end of the media. */ + offset += CONFIG_ROM_SIZE; + + rdev_readat(bdev, &header , offset, sizeof(header)); + + header.magic = ntohl(header.magic); + header.romsize = ntohl(header.romsize); + header.bootblocksize = ntohl(header.bootblocksize); + header.align = ntohl(header.align); + header.offset = ntohl(header.offset); + + if (header.magic != CBFS_HEADER_MAGIC) + return -1; + + props->align = header.align; + props->offset = header.offset; + if (CONFIG_ROM_SIZE != header.romsize) + props->size = CONFIG_ROM_SIZE; + else + props->size = header.romsize; + props->size -= props->offset; + props->size -= header.bootblocksize; + props->size = ALIGN_DOWN(props->size, props->align); + + printk(BIOS_DEBUG, "CBFS @ %zx size %zx\n", props->offset, props->size); + + return 0; +} |