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. |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | // Use simple device model for this file even in ramstage |
| 17 | #define __SIMPLE_DEVICE__ |
| 18 | |
| 19 | #include <arch/io.h> |
| 20 | #include <cbmem.h> |
| 21 | #include "i945.h" |
| 22 | |
Kyösti Mälkki | f1e3c76 | 2014-12-22 12:28:07 +0200 | [diff] [blame] | 23 | static uintptr_t smm_region_start(void) |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 24 | { |
Kyösti Mälkki | f1e3c76 | 2014-12-22 12:28:07 +0200 | [diff] [blame] | 25 | uintptr_t tom; |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 26 | |
Kyösti Mälkki | 3c3e34d | 2014-05-31 11:32:54 +0300 | [diff] [blame] | 27 | if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & (DEVEN_D2F0 | DEVEN_D2F1)) { |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 28 | /* IGD enabled, get top of Memory from BSM register */ |
Paul Menzel | 355ce38 | 2014-05-30 13:58:59 +0200 | [diff] [blame] | 29 | tom = pci_read_config32(PCI_DEV(0,2,0), BSM); |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 30 | } else { |
| 31 | tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24; |
| 32 | } |
| 33 | |
| 34 | /* if TSEG enabled subtract size */ |
Kyösti Mälkki | fd2501b | 2014-05-31 16:36:29 +0300 | [diff] [blame] | 35 | switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM) & 0x07) { |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 36 | case 0x01: |
| 37 | /* 1MB TSEG */ |
Kyösti Mälkki | fd2501b | 2014-05-31 16:36:29 +0300 | [diff] [blame] | 38 | tom -= 0x100000; |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 39 | break; |
| 40 | case 0x03: |
| 41 | /* 2MB TSEG */ |
Kyösti Mälkki | fd2501b | 2014-05-31 16:36:29 +0300 | [diff] [blame] | 42 | tom -= 0x200000; |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 43 | break; |
| 44 | case 0x05: |
| 45 | /* 8MB TSEG */ |
Kyösti Mälkki | fd2501b | 2014-05-31 16:36:29 +0300 | [diff] [blame] | 46 | tom -= 0x800000; |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 47 | break; |
| 48 | default: |
| 49 | /* TSEG either disabled or invalid */ |
| 50 | break; |
| 51 | } |
Kyösti Mälkki | f1e3c76 | 2014-12-22 12:28:07 +0200 | [diff] [blame] | 52 | return tom; |
| 53 | } |
| 54 | |
| 55 | void *cbmem_top(void) |
| 56 | { |
| 57 | return (void *) smm_region_start(); |
Kyösti Mälkki | cb08e16 | 2013-10-15 17:19:41 +0300 | [diff] [blame] | 58 | } |