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+/*
+ * 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:
+ */