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/*
* capability.c
* ------------
* This module contains code to probe the FPGA for its installed cores.
*
* Author: Paul Selkirk
* Copyright (c) 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 <stdint.h>
#include <string.h>
#include "cryptech.h"
static struct core_info *tc_probe_cores(void)
{
static struct core_info *head = NULL;
struct core_info *tail = NULL, *node;
off_t offset;
if (head != NULL)
return head;
/* XXX could use unix linked-list macros */
for (offset = 0; offset < 0x10000; offset += CORE_SIZE) {
node = calloc(1, sizeof(struct core_info));
if (node == NULL) {
perror("malloc");
goto fail;
}
if (tc_read(offset, (uint8_t *)&node->name[0], 8) ||
tc_read(offset + 2, (uint8_t *)&node->version[0], 4)) {
fprintf(stderr, "tc_read(%04x) error\n", (unsigned int)offset);
free(node);
goto fail;
}
if (node->name[0] == 0) {
free(node);
break;
}
node->base = offset;
if (head == NULL) {
head = tail = node;
}
else {
tail->next = node;
tail = node;
}
}
return head;
fail:
while (head) {
node = head;
head = node->next;
free(node);
}
return NULL;
}
static struct core_info *tc_core_find(struct core_info *node, char *name)
{
struct core_info *core;
size_t len;
if ((name == NULL) || (*name == '\0'))
return node;
len = strlen(name);
for (core = node->next; core != NULL; core = core->next) {
if (strncmp(core->name, name, len) == 0)
return core;
}
return NULL;
}
struct core_info *tc_core_first(char *name)
{
struct core_info *head;
head = tc_probe_cores();
if (head == NULL)
return NULL;
return tc_core_find(head, name);
}
struct core_info *tc_core_next(struct core_info *node, char *name)
{
if (node == NULL) {
node = tc_core_first(name);
if (node == NULL)
return NULL;
}
return tc_core_find(node->next, name);
}
off_t tc_core_base(char *name)
{
struct core_info *node;
node = tc_core_first(name);
if (node == NULL)
return 0;
/* 0 is the base address for the "board-regs" core, installed
* unconditionally at that address. Probing for any other core,
* and getting 0, should be considered an error.
*/
return node->base;
}
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