| Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2007-2009 coresystems GmbH |
| 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 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | // Use simple device model for this file even in ramstage |
| 21 | #define __SIMPLE_DEVICE__ |
| 22 | |
| 23 | #include <arch/io.h> |
| 24 | #include <cbmem.h> |
| 25 | #include "i945.h" |
| 26 | |
| 27 | unsigned long get_top_of_ram(void) |
| 28 | { |
| 29 | u32 tom; |
| 30 | |
| 31 | if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & ((1 << 4) | (1 << 3))) { |
| 32 | /* IGD enabled, get top of Memory from BSM register */ |
| 33 | tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c); |
| 34 | } else { |
| 35 | tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24; |
| 36 | } |
| 37 | |
| 38 | /* if TSEG enabled subtract size */ |
| 39 | switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM)) { |
| 40 | case 0x01: |
| 41 | /* 1MB TSEG */ |
| 42 | tom -= 0x10000; |
| 43 | break; |
| 44 | case 0x03: |
| 45 | /* 2MB TSEG */ |
| 46 | tom -= 0x20000; |
| 47 | break; |
| 48 | case 0x05: |
| 49 | /* 8MB TSEG */ |
| 50 | tom -= 0x80000; |
| 51 | break; |
| 52 | default: |
| 53 | /* TSEG either disabled or invalid */ |
| 54 | break; |
| 55 | } |
| 56 | return (unsigned long) tom; |
| 57 | } |