mirror of
https://github.com/trezor/trezor-firmware.git
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98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TREZORHAL_SYSTIMER_H
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#define TREZORHAL_SYSTIMER_H
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef KERNEL_MODE
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// Initializes systimer subsystem
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//
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// Before calling this function, none of the other functions
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// from this module should be called.
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void systimer_init(void);
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// Deinitialize sytimer subsystem
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void systimer_deinit(void);
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// Timer handle
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typedef struct systimer systimer_t;
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// Timer callback routine invoked when timer expires
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//
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// The callback should be as short as possible and should not
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// block. It is invoked from the timer interrupt context.
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//
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// `context` is the pointer passed to `timer_create`
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typedef void (*systimer_callback_t)(void* context);
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// Initializes the timer and returns its handle.
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//
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// There a limited number of timers and `NULL` is returned
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// if no timer is available.
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systimer_t* systimer_create(systimer_callback_t callback, void* context);
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// Deletes the timer
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//
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// Timer is unset and its resources are released.
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void systimer_delete(systimer_t* timer);
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// Sets the timer to expire in `delay_ms` milliseconds
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//
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// If the timer is already set, it will be rescheduled.
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void systimer_set(systimer_t* timer, uint32_t delay_ms);
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// Sets the timer to expire periodically every `period_ms` milliseconds
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//
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// If the timer is already set, it will be rescheduled.
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void systimer_set_periodic(systimer_t* timer, uint32_t period_ms);
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// Unsets the timer (cancels the expiration)
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//
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// Timer is not deleted and can be set again.
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//
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// Returns `true` if the timer was unset before its expiration
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// so the callback will not be invoked.
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bool systimer_unset(systimer_t* timer);
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// Timer suspension state (opaque type).
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// Allows to recursively suspend/resume timer.
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typedef bool systimer_key_t;
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// Suspends timer callback invocation
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//
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// The purpose of this function is to prevent the timer callback
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// from being invoked for synchronization purposes. The function
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// returns a lock that should be passed to `systimer_resume()` to
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// resume the timer callback invocation.
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systimer_key_t systimer_suspend(systimer_t* timer);
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// Resumes timer callback invocation
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//
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// The timer callback invocation is resumed. The `key` should
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// be the same as returned by `timer_suspend()`.
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void systimer_resume(systimer_t* timer, systimer_key_t key);
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#endif // KERNEL_MODE
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#endif // TREZORHAL_SYSTIMER_H
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