src/soc/intel/fsp_baytrail/memmap.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 Google, Inc.
   5  * Copyright (C) 2014 Sage Electronic Engineering, LLC.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <arch/io.h>
  18 #include <cbmem.h>
  19 #include <baytrail/iosf.h>
  20 #include <baytrail/smm.h>
  21 #include <drivers/intel/fsp1_0/fsp_util.h>
  22
  23 uintptr_t smm_region_start(void)
  24 {
  25         return (iosf_bunit_read(BUNIT_SMRRL) << 20);
  26 }
  27
  28 /** @brief get the top of usable low memory from the FSP's HOB list
  29  *
  30  * The FSP's reserved memory sits just below the SMM region.  The memory
  31  * region below it is usable memory.
  32  *
  33  * The entire memory map is shown in northcluster.c
  34  *
  35  * @return pointer to the first byte of reserved memory
  36  */
  37
  38 void *cbmem_top(void)
  39 {
  40         return find_fsp_reserved_mem(*(void **)CBMEM_FSP_HOB_PTR);
  41 }