| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 secunet Security Networks AG |
| * |
| * 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 <stdint.h> |
| #include <arch/io.h> |
| #include <device/pci_def.h> |
| #include <console/console.h> |
| #include <cbmem.h> |
| #include "gm45.h" |
| |
| /** Decodes used Graphics Mode Select (GMS) to kilobytes. */ |
| u32 decode_igd_memory_size(const u32 gms) |
| { |
| switch (gms) { |
| case 1: |
| return 1 << 10; |
| case 2: |
| return 4 << 10; /* guessed */ |
| case 3: |
| return 8 << 10; /* guessed */ |
| case 4: |
| return 16 << 10; |
| case 5: |
| return 32 << 10; |
| case 7: |
| return 64 << 10; |
| case 8: |
| return 128 << 10; |
| case 9: |
| return 256 << 10; |
| case 10: |
| return 96 << 10; |
| case 11: |
| return 160 << 10; |
| case 12: |
| return 224 << 10; |
| case 13: |
| return 352 << 10; |
| default: |
| die("Bad Graphics Mode Select (GMS) setting.\n"); |
| return 0; |
| } |
| } |
| |
| /** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */ |
| u32 decode_igd_gtt_size(const u32 gsm) |
| { |
| switch (gsm) { |
| case 0: |
| return 0 << 10; |
| case 1: |
| return 1 << 10; |
| case 3: |
| case 9: |
| return 2 << 10; |
| case 10: |
| return 3 << 10; |
| case 11: |
| return 4 << 10; |
| default: |
| die("Bad Graphics Stolen Memory (GSM) setting.\n"); |
| return 0; |
| } |
| } |
| |
| unsigned long get_top_of_ram(void) |
| { |
| const pci_devfn_t dev = PCI_DEV(0, 0, 0); |
| |
| u32 tor; |
| |
| /* Top of Lower Usable DRAM */ |
| tor = (pci_read_config16(dev, D0F0_TOLUD) & 0xfff0) << 16; |
| |
| /* Graphics memory comes next */ |
| const u32 ggc = pci_read_config16(dev, D0F0_GGC); |
| if (!(ggc & 2)) { |
| /* Graphics memory */ |
| tor -= decode_igd_memory_size((ggc >> 4) & 0xf) << 10; |
| /* GTT Graphics Stolen Memory Size (GGMS) */ |
| tor -= decode_igd_gtt_size((ggc >> 8) & 0xf) << 10; |
| } |
| return tor; |
| } |