| /* |
| * 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 warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <cbmem.h> |
| #include <cpu/x86/smm.h> |
| #include <soc/iosf.h> |
| #include <drivers/intel/fsp1_0/fsp_util.h> |
| #include <types.h> |
| |
| static uintptr_t smm_region_start(void) |
| { |
| return (iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20; |
| } |
| |
| static size_t smm_region_size(void) |
| { |
| return CONFIG_SMM_TSEG_SIZE; |
| } |
| |
| /** @brief get the top of usable low memory from the FSP's HOB list |
| * |
| * The FSP's reserved memory sits just below the SMM region. The memory |
| * region below it is usable memory. |
| * |
| * The entire memory map is shown in northcluster.c |
| * |
| * @return pointer to the first byte of reserved memory |
| */ |
| |
| void *cbmem_top(void) |
| { |
| return find_fsp_reserved_mem(*(void **)CBMEM_FSP_HOB_PTR); |
| } |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| *start = smm_region_start(); |
| *size = smm_region_size(); |
| } |