src/northbridge/intel/nehalem/ram_calc.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 Vladimir Serbinenko.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #define __SIMPLE_DEVICE__
  17
  18 #include <arch/io.h>
  19 #include <cbmem.h>
  20 #include "nehalem.h"
  21
  22 static uintptr_t smm_region_start(void)
  23 {
  24         /* Base of TSEG is top of usable DRAM */
  25         uintptr_t tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
  26         return tom;
  27 }
  28
  29 void *cbmem_top(void)
  30 {
  31         return (void *) smm_region_start();
  32 }