| /* |
| * 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 <device/pci_ops.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> |
| #include <cpu/intel/smm/gen1/smi.h> |
| #include <stdint.h> |
| #include <stage_cache.h> |
| |
| /* Decodes TSEG region size to bytes. */ |
| u32 decode_tseg_size(const u8 esmramc) |
| { |
| if (!(esmramc & 1)) |
| return 0; |
| switch ((esmramc >> 1) & 3) { |
| case 0: |
| return 1 << 20; |
| case 1: |
| return 2 << 20; |
| case 2: |
| return 8 << 20; |
| case 3: |
| default: |
| die("Bad TSEG setting.\n"); |
| } |
| } |
| |
| u32 northbridge_get_tseg_base(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; |
| |
| /* subsctract TSEG size */ |
| tom -= decode_tseg_size(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC)); |
| return tom; |
| } |
| |
| u32 northbridge_get_tseg_size(void) |
| { |
| const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC); |
| return decode_tseg_size(esmramc); |
| } |
| |
| /* |
| * Depending of UMA and TSEG configuration, TSEG might start at any |
| * 1 MiB alignment. 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(northbridge_get_tseg_base(), 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; |
| } |
| |
| void stage_cache_external_region(void **base, size_t *size) |
| { |
| /* The stage cache lives at the end of the TSEG region. |
| * The top of RAM is defined to be the TSEG base address. |
| */ |
| *size = CONFIG_SMM_RESERVED_SIZE; |
| *base = (void *)((uintptr_t)northbridge_get_tseg_base() |
| + northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE); |
| } |
| |
| /* platform_enter_postcar() determines the stack to use after |
| * cache-as-ram is torn down as well as the MTRR settings to use, |
| * and continues execution in postcar stage. */ |
| void platform_enter_postcar(void) |
| { |
| struct postcar_frame pcf; |
| uintptr_t top_of_ram; |
| |
| if (postcar_frame_init(&pcf, 0)) |
| 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 8 MiB region below the top of ram and 2 MiB above top of |
| * ram to cover both cbmem as the TSEG region. |
| */ |
| top_of_ram = (uintptr_t)cbmem_top(); |
| postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB, |
| MTRR_TYPE_WRBACK); |
| postcar_frame_add_mtrr(&pcf, northbridge_get_tseg_base(), |
| northbridge_get_tseg_size(), MTRR_TYPE_WRBACK); |
| |
| run_postcar_phase(&pcf); |
| |
| /* We do not return here. */ |
| } |