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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Intel Corp.
* (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
* (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#include <boot_device.h>
#include <cbfs.h>
#include <commonlib/region.h>
#include <console/console.h>
#include <fmap.h>
#include <intelblocks/fast_spi.h>
/*
* BIOS region on the flash is mapped right below 4GiB in the address
* space. However, 256KiB right below 4GiB is decoded by read-only SRAM and not
* boot media.
*
* +-----------+ 0
* | |
* | |
* | |
* | |
* | |
* | |
* | |
* | |
* +--------+ | |
* | IFD | | |
* bios_start +---> +--------+------------------> +-----------+ 4GiB - bios_size
* ^ | | ^ | |
* | | | | | |
* | | | bios_mapped_size | BIOS |
* | | BIOS | | | |
* bios_size | | | | |
* | | | v | |
* | | +------------------> +-----------+ 4GiB - 256KiB
* | | | | Read only |
* v | | | SRAM |
* bios_end +---> +--------+ +-----------+ 4GiB
* | Device |
* | ext |
* +--------+
*
*/
static size_t bios_size;
static struct mem_region_device shadow_dev;
static struct xlate_region_device real_dev;
static void bios_mmap_init(void)
{
size_t size, start, bios_mapped_size;
uintptr_t base;
size = bios_size;
/* If bios_size is initialized, then bail out. */
if (size != 0)
return;
start = fast_spi_get_bios_region(&size);
/* BIOS region is mapped right below 4G. */
base = 4ULL * GiB - size;
/*
* The 256 KiB right below 4G are decoded by readonly SRAM,
* not boot media.
*/
bios_mapped_size = size - 256 * KiB;
mem_region_device_ro_init(&shadow_dev, (void *)base,
bios_mapped_size);
xlate_region_device_ro_init(&real_dev, &shadow_dev.rdev,
start, bios_mapped_size,
CONFIG_ROM_SIZE);
bios_size = size;
}
const struct region_device *boot_device_ro(void)
{
bios_mmap_init();
return &real_dev.rdev;
}
static int iafw_boot_region_device(struct region_device *rdev)
{
struct region *real_dev_reg;
if (cbfs_default_region_device(rdev))
return -1;
/* Check that we are within the memory mapped area. It's too
easy to forget the SRAM mapping when crafting an FMAP file. */
real_dev_reg = &real_dev.sub_region;
if (region_is_subregion(real_dev_reg, region_device_region(rdev))) {
printk(BIOS_DEBUG, "CBFS @ %zx size %zx\n",
region_device_offset(rdev), region_device_sz(rdev));
} else {
printk(BIOS_CRIT,
"ERROR: CBFS @ %zx size %zx exceeds mem-mapped area @ %zx size %zx\n",
region_device_offset(rdev), region_device_sz(rdev),
region_offset(real_dev_reg), region_sz(real_dev_reg));
}
return 0;
}
/*
* Named cbfs_default_locator so that it overrides the default, but incompatible
* locator in cbfs.c
*/
const struct cbfs_locator cbfs_default_locator = {
.name = "IAFW Locator",
.locate = iafw_boot_region_device,
};
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