/*
* locks.c
* -------
* Dummy lock code for libhal.
*
* Copyright (c) 2017, 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 "hal.h"
#include "hal_internal.h"
/*
* There are three slightly peculiar things about this module.
*
* 1) We want to include optional support for GNU weak functions,
* because they're convenient, but we don't want to require support
* for them. So we wrap this in a compilation time conditional
* which defaults to something compatible with C99, but allow this
* to be overriden via an external definition.
*
* 2) The functions in this module are all no-ops, just here so that
* things will link correctly on platforms that don't define them.
* Real definitions for these functions have to come from the port
* to a specific environment, eg, from sw/stm32/projects/hsm.c.
*
* 3) Because we want to expose as little as possible of the
* underlying mechanisms, some of the functions here are closures
* encapsulating objects things which would otherwise be arguments.
* So, for example, we have functions to lock and unlock the HSM
* keystore, rather than general lock and unlock functions which
* they HSM keystore lock as an argument. Since the versions in
* this file are the no-ops, the lock itself goes away here.
*/
#ifndef ENABLE_WEAK_FUNCTIONS
#define ENABLE_WEAK_FUNCTIONS 0
#endif
#if ENABLE_WEAK_FUNCTIONS
#define WEAK_FUNCTION __attribute__((weak))
#else
#define WEAK_FUNCTION
#endif
/*
* Critical sections -- disable preemption BRIEFLY.
*/
WEAK_FUNCTION void hal_critical_section_start(void) { return; }
WEAK_FUNCTION void hal_critical_section_end(void) { return; }
/*
* Keystore lock -- lock call blocks indefinitely.
*/
WEAK_FUNCTION void hal_ks_lock(void) { return; }
WEAK_FUNCTION void hal_ks_unlock(void) { return; }
/*
* RSA blinding cache lock -- lock call blocks indefinitely.
*/
WEAK_FUNCTION void hal_rsa_bf_lock(void) { return; }
WEAK_FUNCTION void hal_rsa_bf_unlock(void) { return; }
/*
* Non-preemptive task yield.
*/
WEAK_FUNCTION void hal_task_yield(void)
{
return;
}
WEAK_FUNCTION void hal_task_yield_maybe(void)
{
return;
}
/*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
