diff options
Diffstat (limited to 'src/lib/cbfs_boot_props.c')
-rw-r--r-- | src/lib/cbfs_boot_props.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/lib/cbfs_boot_props.c b/src/lib/cbfs_boot_props.c new file mode 100644 index 0000000000..21e64d37a5 --- /dev/null +++ b/src/lib/cbfs_boot_props.c @@ -0,0 +1,66 @@ +/* + * 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 <cbfs.h> +#include <console/console.h> +#include <endian.h> +#include <region.h> + +/* This function is marked as weak to allow a particular platform to + * override the logic. This implementation should work for most devices. */ +int __attribute__((weak)) cbfs_boot_region_properties(struct cbfs_props *props) +{ + struct cbfs_header header; + const struct region_device *bdev; + int32_t rel_offset; + size_t offset; + + bdev = boot_device_ro(); + + if (bdev == NULL) + return -1; + + /* Find location of header using signed 32-bit offset from + * end of CBFS region. */ + offset = CONFIG_CBFS_SIZE - sizeof(int32_t); + if (rdev_readat(bdev, &rel_offset, offset, sizeof(int32_t)) < 0) + return -1; + + offset = CONFIG_CBFS_SIZE + rel_offset; + if (rdev_readat(bdev, &header, offset, sizeof(header)) < 0) + return -1; + + header.magic = ntohl(header.magic); + header.romsize = ntohl(header.romsize); + 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; + props->size = header.romsize; + props->size -= props->offset; + + printk(BIOS_SPEW, "CBFS @ %zx size %zx\n", props->offset, props->size); + + return 0; +} |