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Diffstat (limited to 'locks.c')
| -rw-r--r-- | locks.c | 108 |
1 files changed, 108 insertions, 0 deletions
@@ -0,0 +1,108 @@ +/* + * 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; +} + +/* + * Local variables: + * indent-tabs-mode: nil + * End: + */ |