src/northbridge/intel/sandybridge/memmap.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 Google Inc.
 *
 * 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.
 */

#define __SIMPLE_DEVICE__

#include <arch/cpu.h>
#include <device/pci_ops.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/intel/romstage.h>
#include <cpu/intel/smm/gen1/smi.h>
#include <cpu/x86/mtrr.h>
#include <program_loading.h>
#include <stage_cache.h>
#include "sandybridge.h"

static uintptr_t smm_region_start(void)
{
	/* Base of TSEG is top of usable DRAM */
	uintptr_t tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
	return tom;
}

void *cbmem_top(void)
{
	return (void *) smm_region_start();
}

u32 northbridge_get_tseg_base(void)
{
	return ALIGN_DOWN(smm_region_start(), 1*MiB);
}

u32 northbridge_get_tseg_size(void)
{
	return CONFIG_SMM_TSEG_SIZE;
}

void stage_cache_external_region(void **base, size_t *size)
{
	/* The stage cache lives at the end of 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_IED_REGION_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);

	top_of_ram = (uintptr_t)cbmem_top();
	/* Cache 8MiB below the top of ram. On sandybridge systems the top of
	 * ram under 4GiB is the start of the TSEG region. It is required to
	 * be 8MiB aligned. Set this area as cacheable so it can be used later
	 * for ramstage before setting up the entire RAM as cacheable. */
	postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB, MTRR_TYPE_WRBACK);

	/* Cache 8MiB at the top of ram. Top of ram on sandybridge systems
	 * is where the TSEG region resides. However, it is not restricted
	 * to SMM mode until SMM has been relocated. By setting the region
	 * to cacheable it provides faster access when relocating the SMM
	 * handler as well as using the TSEG region for other purposes. */
	postcar_frame_add_mtrr(&pcf, top_of_ram, 8*MiB, MTRR_TYPE_WRBACK);

	run_postcar_phase(&pcf);

	/* We do not return here. */
}