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/*
* 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 <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>
/* 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;
}
#define ROMSTAGE_RAM_STACK_SIZE 0x5000
/* 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, 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 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. */
}
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