97 lines
3.4 KiB
C
97 lines
3.4 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* This file is part of the VARCem Project.
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*
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* Definitions for the system timer module.
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*
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* Version: @(#)timer.h 1.0.2 2018/05/04
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*
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* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
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* Miran Grca, <mgrca8@gmail.com>
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* Sarah Walker, <tommowalker@tommowalker.co.uk>
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*
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* Copyright 2017,2018 Fred N. van Kempen.
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* Copyright 2016-2018 Miran Grca.
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* Copyright 2008-2018 Sarah Walker.
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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 2 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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, write to the:
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*
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* Free Software Foundation, Inc.
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* 59 Temple Place - Suite 330
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* Boston, MA 02111-1307
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* USA.
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*/
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#ifndef EMU_TIMER_H
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# define EMU_TIMER_H
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extern int64_t timer_start;
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#define timer_start_period(cycles) \
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timer_start = cycles;
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#define timer_end_period(cycles) \
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do \
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{ \
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int64_t __diff = timer_start - (cycles); \
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timer_count -= __diff; \
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timer_start = cycles; \
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if (timer_count <= 0) \
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{ \
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timer_process(); \
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timer_update_outstanding(); \
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} \
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} while (0)
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#define timer_clock() \
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do \
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{ \
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int64_t __diff; \
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if (AT) \
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{ \
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__diff = timer_start - (cycles << TIMER_SHIFT); \
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timer_start = cycles << TIMER_SHIFT; \
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} \
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else \
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{ \
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__diff = timer_start - (cycles * xt_cpu_multi); \
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timer_start = cycles * xt_cpu_multi; \
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} \
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timer_count -= __diff; \
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timer_process(); \
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timer_update_outstanding(); \
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} while (0)
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extern void timer_process(void);
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extern void timer_update_outstanding(void);
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extern void timer_reset(void);
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extern int64_t timer_add(void (*callback)(void *priv), int64_t *count, int64_t *enable, void *priv);
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extern void timer_set_callback(int64_t timer, void (*callback)(void *priv));
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#define TIMER_ALWAYS_ENABLED &timer_one
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extern int64_t timer_count;
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extern int64_t timer_one;
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#define TIMER_SHIFT 6
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extern int64_t TIMER_USEC;
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#endif /*EMU_TIMER_H*/
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