diff options
Diffstat (limited to 'src/northbridge/intel/fsp_rangeley/raminit.c')
| -rw-r--r-- | src/northbridge/intel/fsp_rangeley/raminit.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/northbridge/intel/fsp_rangeley/raminit.c b/src/northbridge/intel/fsp_rangeley/raminit.c new file mode 100644 index 0000000000..3513c0f33d --- /dev/null +++ b/src/northbridge/intel/fsp_rangeley/raminit.c @@ -0,0 +1,44 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 Google Inc. + * Copyright (C) 2013-2014 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. + * + * 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 <console/console.h> +#include <string.h> +#include <arch/io.h> +#include <cbmem.h> +#include <device/pci_def.h> +#include "northbridge.h" +#include <drivers/intel/fsp/fsp_util.h> + +unsigned long get_top_of_ram(void) +{ + /* + * 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. + */ + u32 tom = sideband_read(B_UNIT, BMBOUND); + u32 bsmmrrl = sideband_read(B_UNIT, BSMMRRL) << 20; + if (bsmmrrl) { + tom = bsmmrrl; + } + tom -= FSP_RESERVE_MEMORY_SIZE; + + return (unsigned long) tom; +} |