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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Hyra 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 OWNER 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 <dev/timer.h>
/*
* When a timer on the machine has been registered
* to the Hyra kernel, they'll be added to the Hyra timer
* registry.
*/
static const struct timer *tmr_registry[TIMER_ID_COUNT] = { 0 };
/*
* Returns true if the timer ID given
* is valid.
*
* @id: ID to verify.
*/
static inline bool
is_timer_id_valid(timer_id_t id)
{
return id < TIMER_ID_COUNT;
}
/*
* Adds timer on the machine to the timer registry. To be specific,
* this function writes information about the specific timer to the
* timer registry. However, it will not overwrite an entry. To do this
* you must use tmr_registry_overwrite(), of course with caution.
*
* @id: ID of timer to register.
* @tmr: Timer descriptor to register.
*/
tmrr_status_t
register_timer(timer_id_t id, const struct timer *tmr)
{
if (!is_timer_id_valid(id))
return TMRR_INVALID_TYPE;
if (tmr_registry[id] != NULL)
return TMRR_HAS_ENTRY;
tmr_registry[id] = tmr;
return TMRR_SUCCESS;
}
/*
* Overwrites an entry within the timer registery.
* Use with caution.
*
* @id: ID of entry to overwrite.
* @tmr: Timer descriptor to write.
*/
tmrr_status_t
tmr_registry_overwrite(timer_id_t id, const struct timer *tmr)
{
if (!is_timer_id_valid(id))
return TMRR_INVALID_TYPE;
tmr_registry[id] = tmr;
return TMRR_SUCCESS;
}
/*
* Requests a specific timer descriptor
* with a specific ID.
*
* @id: ID to request.
* @tmr_out: Pointer to memory that'll hold the
* requested descriptor.
*/
tmrr_status_t
req_timer(timer_id_t id, struct timer *tmr_out)
{
if (!is_timer_id_valid(id))
return TMRR_INVALID_TYPE;
if (tmr_registry[id] == NULL)
return TMRR_EMPTY_ENTRY;
if (tmr_out == NULL)
return TMRR_INVALID_ARG;
*tmr_out = *tmr_registry[id];
return TMRR_SUCCESS;
}
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