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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <string.h>
#include <arch/byteorder.h>
#include <cbmem.h>
#include <cbfs.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <vendorcode/google/chromeos/chromeos.h>
#define CACHELINE_SIZE 64
#define INTRA_CACHELINE_MASK (CACHELINE_SIZE - 1)
#define CACHELINE_MASK (~INTRA_CACHELINE_MASK)
/* Mirror the payload file to the default SMM location if it is small enough.
* The default SMM region can be used since no one is using the memory at this
* location at this stage in the boot. */
static inline void *spi_mirror(void *file_start, int file_len)
{
int alignment_diff;
char *src;
char *dest = (void *)SMM_DEFAULT_BASE;
alignment_diff = (INTRA_CACHELINE_MASK & (long)file_start);
/* Adjust file length so that the start and end points are aligned to a
* cacheline. Coupled with the ROM caching in the CPU the SPI hardware
* will read and cache full length cachelines. It will also prefetch
* data as well. Once things are mirrored in memory all accesses should
* hit the CPUs cache. */
file_len += alignment_diff;
file_len = ALIGN(file_len, CACHELINE_SIZE);
printk(BIOS_DEBUG, "Payload aligned size: 0x%x\n", file_len);
/* Just pass back the pointer to ROM space if the file is larger
* than the RAM mirror region. */
if (file_len > SMM_DEFAULT_SIZE)
return file_start;
src = (void *)(CACHELINE_MASK & (long)file_start);
/* Note that if mempcy is not using 32-bit moves the performance will
* degrade because the SPI hardware prefetchers look for
* cacheline-aligned 32-bit accesses to kick in. */
memcpy(dest, src, file_len);
/* Provide pointer into mirrored space. */
return &dest[alignment_diff];
}
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