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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Intel Corp.
* (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#include <arch/romstage.h>
#include <assert.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <device/pci.h>
#include <soc/systemagent.h>
#include <soc/pci_devs.h>
#include "chip.h"
void *cbmem_top(void)
{
const config_t *config;
void *tolum = (void *)sa_get_tseg_base();
if (!CONFIG(SOC_INTEL_GLK))
return tolum;
config = config_of_path(PCH_DEVFN_LPC);
/* FSP allocates 2x PRMRR Size Memory for alignment */
if (config->sgx_enable)
tolum -= config->PrmrrSize * 2;
return tolum;
}
void smm_region(uintptr_t *start, size_t *size)
{
*start = sa_get_tseg_base();
*size = sa_get_tseg_size();
}
void fill_postcar_frame(struct postcar_frame *pcf)
{
uintptr_t top_of_ram;
uintptr_t smm_base;
size_t smm_size;
/*
* We need to make sure ramstage will be run cached. At this point exact
* location of ramstage in cbmem is not known. Instruct postcar to cache
* 16 megs under cbmem top which is a safe bet to cover ramstage.
*/
top_of_ram = (uintptr_t) cbmem_top();
/* cbmem_top() needs to be at least 16 MiB aligned */
assert(ALIGN_DOWN(top_of_ram, 16*MiB) == top_of_ram);
postcar_frame_add_mtrr(pcf, top_of_ram - 16*MiB, 16*MiB,
MTRR_TYPE_WRBACK);
/*
* Cache the TSEG region at the top of ram. This region 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.
*/
smm_region(&smm_base, &smm_size);
postcar_frame_add_mtrr(pcf, smm_base, smm_size, MTRR_TYPE_WRBACK);
}
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