| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2013 Google, Inc. |
| * Copyright (C) 2014 Sage Electronic Engineering, LLC. |
| * |
| * 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 wacbmem_entryanty 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <arch/io.h> |
| #include <cbmem.h> |
| #include <baytrail/iosf.h> |
| #include <baytrail/smm.h> |
| #include <drivers/intel/fsp/fsp_util.h> |
| |
| uintptr_t smm_region_start(void) |
| { |
| return (iosf_bunit_read(BUNIT_SMRRL) << 20); |
| } |
| |
| /* |
| * Calculate the top of usable (low) DRAM. |
| * The FSP's reserved memory sits just below the SMM region, |
| * allowing calculation of the top of usable memory. |
| * |
| * The entire memory map is shown in northcluster.c |
| */ |
| |
| void *cbmem_top(void) |
| { |
| uintptr_t tom = smm_region_start(); |
| if (!tom) |
| tom = iosf_bunit_read(BUNIT_BMBOUND); |
| return (void *) tom - FSP_RESERVE_MEMORY_SIZE; |
| } |