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/*
* tc_eim.c
* --------
* This module contains common code to talk to the FPGA over the EIM bus.
*
* Author: Paul Selkirk
* Copyright (c) 2014-2015, NORDUnet A/S 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 the NORDUnet 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <arpa/inet.h>
#include "novena-eim.h"
#include "cryptech.h"
static int debug = 0;
/* ---------------- EIM low-level code ---------------- */
static int init(void)
{
static int inited = 0;
if (inited)
return 0;
if (eim_setup() != 0) {
fprintf(stderr, "EIM setup failed\n");
return -1;
}
inited = 1;
return 0;
}
/* translate cryptech register number to EIM address
*
* register number format:
* 3 bits segment selector
* 5 bits core selector (6 bits in native eim)
* 8 bits register selector
*
* sss ccccc rrrrrrrr => 00001000000000 sss 0 ccccc rrrrrrrr 00
*/
static off_t eim_offset(off_t offset)
{
return EIM_BASE_ADDR + ((offset & ~0x1fff) << 3) + ((offset & 0x1fff) << 2);
}
/* ---------------- test-case low-level code ---------------- */
void tc_set_debug(int onoff)
{
debug = onoff;
}
static void dump(char *label, off_t addr, const uint8_t *buf, size_t len)
{
if (debug) {
int i;
printf("%s %04x [", label, (unsigned int)addr);
for (i = 0; i < len; ++i)
printf(" %02x", buf[i]);
printf(" ]\n");
}
}
int tc_write(off_t offset, const uint8_t *buf, size_t len)
{
if (init() != 0)
return -1;
dump("write ", offset, buf, len);
for (offset = eim_offset(offset); len > 0; offset += 4, buf += 4, len -= 4) {
uint32_t val;
val = htonl(*(uint32_t *)buf);
eim_write_32(offset, &val);
}
return 0;
}
int tc_read(off_t offset, uint8_t *buf, size_t len)
{
off_t off;
uint8_t *rbuf = buf;
int rlen = len;
if (init() != 0)
return -1;
for (off = eim_offset(offset); rlen > 0; off += 4, rbuf += 4, rlen -= 4) {
uint32_t val;
eim_read_32(off, &val);
*(uint32_t *)rbuf = ntohl(val);
}
dump("read ", offset, buf, len);
return 0;
}
int tc_expected(off_t offset, const uint8_t *expected, size_t len)
{
uint8_t *buf;
int i;
buf = malloc(len);
if (buf == NULL) {
perror("malloc");
return 1;
}
dump("expect", offset, expected, len);
if (tc_read(offset, buf, len) != 0)
goto errout;
for (i = 0; i < len; ++i)
if (buf[i] != expected[i]) {
fprintf(stderr, "response byte %d: expected 0x%02x, got 0x%02x\n",
i, expected[i], buf[i]);
goto errout;
}
free(buf);
return 0;
errout:
free(buf);
return 1;
}
int tc_init(off_t offset)
{
uint8_t buf[4] = { 0, 0, 0, CTRL_INIT };
return tc_write(offset, buf, 4);
}
int tc_next(off_t offset)
{
uint8_t buf[4] = { 0, 0, 0, CTRL_NEXT };
return tc_write(offset, buf, 4);
}
int tc_wait(off_t offset, uint8_t status, int *count)
{
uint8_t buf[4];
int i;
for (i = 1; ; ++i) {
if (count && (*count > 0) && (i >= *count)) {
fprintf(stderr, "tc_wait timed out\n");
return 1;
}
if (tc_read(offset, buf, 4) != 0)
return -1;
if (buf[3] & status) {
if (count)
*count = i;
return 0;
}
}
}
int tc_wait_ready(off_t offset)
{
int limit = 100000000;
return tc_wait(offset, STATUS_READY, &limit);
}
int tc_wait_valid(off_t offset)
{
int limit = 100000000;
return tc_wait(offset, STATUS_VALID, &limit);
}
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