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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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <console/console.h>
#include <bootmem.h>
#include <program_loading.h>
void mirror_payload(struct prog *payload)
{
char *buffer;
size_t size;
char *src;
uintptr_t alignment_diff;
const unsigned long cacheline_size = 64;
const uintptr_t intra_cacheline_mask = cacheline_size - 1;
const uintptr_t cacheline_mask = ~intra_cacheline_mask;
src = prog_start(payload);
size = prog_size(payload);
/*
* Adjust size so that the start and end points are aligned to a
* cacheline. The SPI hardware controllers on Intel machines should
* cache full length cachelines as well as prefetch data. Once the
* data is mirrored in memory all accesses should hit the CPU's cache.
*/
alignment_diff = (intra_cacheline_mask & (uintptr_t)src);
size += alignment_diff;
size = ALIGN(size, cacheline_size);
printk(BIOS_DEBUG, "Payload aligned size: 0x%zx\n", size);
buffer = bootmem_allocate_buffer(size);
if (buffer == NULL) {
printk(BIOS_DEBUG, "No buffer for mirroring payload.\n");
return;
}
src = (void *)(cacheline_mask & (uintptr_t)src);
/*
* 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(buffer, src, size);
/* Update the payload's backing store. */
prog_set_area(payload, &buffer[alignment_diff], prog_size(payload));
}
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