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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015-2016 Intel Corporation.
*
* 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.
*/
#include <arch/cpu.h>
#include <arch/romstage.h>
#include <cbmem.h>
#include <soc/reg_access.h>
void *cbmem_top_chipset(void)
{
uint32_t top_of_memory;
/* Determine the TSEG base */
top_of_memory = reg_host_bridge_unit_read(QNC_MSG_FSBIC_REG_HSMMC);
top_of_memory &= SMM_START_MASK;
top_of_memory <<= 16;
/* Reserve 64 KiB for RMU firmware */
if (top_of_memory)
top_of_memory -= 0x10000;
/* Return the top of memory */
return (void *)top_of_memory;
}
void fill_postcar_frame(struct postcar_frame *pcf)
{
uintptr_t top_of_ram;
uintptr_t top_of_low_usable_memory;
/* Locate the top of RAM */
top_of_low_usable_memory = (uintptr_t) cbmem_top();
top_of_ram = ALIGN(top_of_low_usable_memory, 16 * MiB);
/* Cache postcar and ramstage */
postcar_frame_add_mtrr(pcf, top_of_ram - (16 * MiB), 16 * MiB,
MTRR_TYPE_WRBACK);
/* Cache RMU area */
postcar_frame_add_mtrr(pcf, (uintptr_t) top_of_low_usable_memory,
0x10000, MTRR_TYPE_WRTHROUGH);
/* Cache ESRAM */
postcar_frame_add_mtrr(pcf, 0x80000000, 0x80000, MTRR_TYPE_WRBACK);
pcf->skip_common_mtrr = 1;
/* Cache SPI flash - Write protect not supported */
postcar_frame_add_romcache(pcf, MTRR_TYPE_WRTHROUGH);
}
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