0,0 → 1,52 |
/* |
* High-resolution timing routines (PIT reprogramming) |
* |
* This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io |
* Published under the terms of the MIT License, as stated below. |
* |
* Copyright (C) 2014-2022 Mateusz Viste |
* |
* Permission is hereby granted, free of charge, to any person obtaining a copy |
* of this software and associated documentation files (the "Software"), to |
* deal in the Software without restriction, including without limitation the |
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
* sell copies of the Software, and to permit persons to whom the Software is |
* furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice shall be included in |
* all copies or substantial portions of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
* IN THE SOFTWARE. |
*/ |
|
#ifndef MDR_TIMER_H |
#define MDR_TIMER_H |
|
/* reset the timer value, this can be used by the application to make sure |
* no timer wrap occurs during critical parts of the code flow */ |
void timer_reset(void); |
|
/* This routine will stop the fast clock if it is going. It has void return |
* value so that it can be an exit procedure. */ |
void timer_stop(void); |
|
/* This routine will start the fast clock rate by installing the |
* handle_clock routine as the interrupt service routine for the clock |
* interrupt and then setting the interrupt rate up to its higher speed |
* by programming the 8253 timer chip. |
* This routine does nothing if the clock rate is already set to |
* its higher rate, but then it returns -1 to indicate the error. */ |
void timer_init(void); |
|
/* This routine will return the present value of the time, which is |
* read from the nowtime structure. Interrupts are disabled during this |
* time to prevent the clock from changing while it is being read. */ |
void timer_read(unsigned long *res); |
|
#endif |