| /* |
| * 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. |
| */ |
| |
| // Use simple device model for this file even in ramstage |
| #define __SIMPLE_DEVICE__ |
| |
| #include <arch/io.h> |
| #include <arch/cpu.h> |
| #include <cbmem.h> |
| #include "i945.h" |
| #include <console/console.h> |
| #include <cpu/intel/romstage.h> |
| #include <cpu/x86/mtrr.h> |
| #include <program_loading.h> |
| |
| static uintptr_t smm_region_start(void) |
| { |
| uintptr_t 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), ESMRAMC) & 0x07) { |
| case 0x01: |
| /* 1MB TSEG */ |
| tom -= 0x100000; |
| break; |
| case 0x03: |
| /* 2MB TSEG */ |
| tom -= 0x200000; |
| break; |
| case 0x05: |
| /* 8MB TSEG */ |
| tom -= 0x800000; |
| break; |
| default: |
| /* TSEG either disabled or invalid */ |
| break; |
| } |
| return tom; |
| } |
| |
| /* Depending of UMA and TSEG configuration, TSEG might start at any |
| * 1 MiB aligment. As this may cause very greedy MTRR setup, push |
| * CBMEM top downwards to 4 MiB boundary. |
| */ |
| void *cbmem_top(void) |
| { |
| uintptr_t top_of_ram = ALIGN_DOWN(smm_region_start(), 4*MiB); |
| return (void *) top_of_ram; |
| } |
| |
| /** Decodes used Graphics Mode Select (GMS) to kilobytes. */ |
| u32 decode_igd_memory_size(const u32 gms) |
| { |
| static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32, |
| 48, 64 }; |
| |
| if (gms > ARRAY_SIZE(ggc2uma)) |
| die("Bad Graphics Mode Select (GMS) setting.\n"); |
| |
| return ggc2uma[gms] << 10; |
| } |
| |
| #define ROMSTAGE_RAM_STACK_SIZE 0x5000 |
| |
| /* setup_stack_and_mtrrs() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use. */ |
| void *setup_stack_and_mtrrs(void) |
| { |
| struct postcar_frame pcf; |
| uintptr_t top_of_ram; |
| |
| if (postcar_frame_init(&pcf, ROMSTAGE_RAM_STACK_SIZE)) |
| die("Unable to initialize postcar frame.\n"); |
| |
| /* Cache the ROM as WP just below 4GiB. */ |
| postcar_frame_add_romcache(&pcf, MTRR_TYPE_WRPROT); |
| |
| /* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */ |
| postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); |
| |
| /* Cache two separate 4 MiB regions below the top of ram, this |
| * satisfies MTRR alignment requirements. If you modify this to |
| * cover TSEG, make sure UMA region is not set with WRBACK as it |
| * causes hard-to-recover boot failures. |
| */ |
| top_of_ram = (uintptr_t)cbmem_top(); |
| postcar_frame_add_mtrr(&pcf, top_of_ram - 4*MiB, 4*MiB, MTRR_TYPE_WRBACK); |
| postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 4*MiB, MTRR_TYPE_WRBACK); |
| |
| /* Save the number of MTRRs to setup. Return the stack location |
| * pointing to the number of MTRRs. |
| */ |
| return postcar_commit_mtrrs(&pcf); |
| } |