| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2007-2009 coresystems GmbH |
| * |
| * 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 |
| */ |
| |
| // Use simple device model for this file even in ramstage |
| #define __SIMPLE_DEVICE__ |
| |
| #include <arch/io.h> |
| #include <cbmem.h> |
| #include "i945.h" |
| |
| unsigned long get_top_of_ram(void) |
| { |
| u32 tom; |
| |
| if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & (DEVEN_D2F0 | DEVEN_D2F1)) { |
| /* IGD enabled, get top of Memory from BSM register */ |
| tom = pci_read_config32(PCI_DEV(0,2,0), BSM); |
| } else { |
| tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24; |
| } |
| |
| /* if TSEG enabled subtract size */ |
| switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM)) { |
| case 0x01: |
| /* 1MB TSEG */ |
| tom -= 0x10000; |
| break; |
| case 0x03: |
| /* 2MB TSEG */ |
| tom -= 0x20000; |
| break; |
| case 0x05: |
| /* 8MB TSEG */ |
| tom -= 0x80000; |
| break; |
| default: |
| /* TSEG either disabled or invalid */ |
| break; |
| } |
| return (unsigned long) tom; |
| } |