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/*
* 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/x86/mtrr.h>
#include <program_loading.h>
#include "sandybridge.h"
#if (CONFIG_SMM_TSEG_SIZE < 0x800000)
# error "CONFIG_SMM_TSEG_SIZE must at least be 8MiB"
#endif
#if ((CONFIG_SMM_TSEG_SIZE & (CONFIG_SMM_TSEG_SIZE - 1)) != 0)
# error "CONFIG_SMM_TSEG_SIZE is not a power of 2"
#endif
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();
}
#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);
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. */
}
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