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/***********************license start***********************************
* Copyright (c) 2003-2017 Cavium Inc. (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Cavium Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* This Software, including technical data, may be subject to U.S. export
* control laws, including the U.S. Export Administration Act and its
* associated regulations, and may be subject to export or import
* regulations in other countries.
*
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT
* TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY
* REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT
* DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES
* OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR
* PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT,
* QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK
* ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
#include "bdk.h"
#include <libbdk-hal/bdk-utils.h>
/* Used for all memory reads/writes related to the test */
#define READ64(address) __bdk_dram_read64(address)
#define WRITE64(address, data) __bdk_dram_write64(address, data)
/**
* Address bus test. This test writes a single value to each power of two in the
* area, looking for false aliases that would be created by address lines being
* shorted or tied together.
*
* @param area
* @param max_address
* @param bursts
*
* @return
*/
int __bdk_dram_test_mem_address_bus(uint64_t area, uint64_t max_address, int bursts)
{
int failures = 0;
/* Clear our work area. Checking for aliases later could get false
positives if it matched stale data */
void *ptr = bdk_phys_to_ptr(area);
bdk_zero_memory(ptr, max_address - area);
__bdk_dram_flush_to_mem_range(area, max_address);
/* Each time we write, we'll write this pattern xored the address it is
written too */
uint64_t pattern = 0x0fedcba987654321;
/* Walk through the region incrementing our offset by a power of two. The
first few writes will be to the same cache line (offset 0x8, 0x10, 0x20,
and 0x40. Offset 0x80 and beyond will be to different cache lines */
uint64_t offset = 0x8;
while (area + offset < max_address)
{
uint64_t address = area + offset;
/* Write one location with pattern xor address */
uint64_t p = pattern ^ address;
WRITE64(address, p);
__bdk_dram_flush_to_mem(address);
offset <<= 1;
}
/* Read all of the area to make sure no other locations were written */
uint64_t a = area;
offset = 0x8;
uint64_t next_write = area + offset;
while (a < max_address)
{
if (a + 256 < max_address)
BDK_PREFETCH(a + 256, 0);
for (int i=0; i<16; i++)
{
uint64_t data = READ64(a);
uint64_t correct;
if (a == next_write)
{
correct = pattern ^ next_write;
offset <<= 1;
next_write = area + offset;
}
else
correct = 0;
if (bdk_unlikely(data != correct))
{
failures++;
__bdk_dram_report_error(a, data, correct, 0, -1);
}
a += 8;
}
}
return failures;
}
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