2aa5d8f5b2
This is enabled by default on 486+ CPUs and can be forced disabled/enabled with pit_mode=0/1
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Header of the implementation of the Intel 8253/8254
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* Programmable Interval Timer.
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*
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*
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*
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* Author: Miran Grca, <mgrca8@gmail.com>
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* Copyright 2019,2020 Miran Grca.
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*/
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#ifndef EMU_PIT_FAST_H
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#define EMU_PIT_FAST_H
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typedef struct {
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uint8_t m, ctrl,
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read_status, latch, bcd;
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uint16_t rl;
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int rm, wm, gate, out,
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newcount, clock, using_timer, latched,
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do_read_status;
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int enabled;
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int disabled;
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int initial;
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int thit;
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int running;
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int rereadlatch;
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union {
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int count;
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struct {
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int units : 4;
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int tens : 4;
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int hundreds : 4;
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int thousands : 4;
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int myriads : 4;
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};
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};
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uint32_t l;
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pc_timer_t timer;
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void (*load_func)(uint8_t new_m, int new_count);
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void (*out_func)(int new_out, int old_out);
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} ctrf_t;
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typedef struct {
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int flags;
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ctrf_t counters[3];
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uint8_t ctrl;
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} pitf_t;
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extern const pit_intf_t pit_fast_intf;
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#ifdef EMU_DEVICE_H
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extern const device_t i8253_fast_device;
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extern const device_t i8254_fast_device;
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extern const device_t i8254_sec_fast_device;
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extern const device_t i8254_ext_io_fast_device;
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extern const device_t i8254_ps2_fast_device;
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#endif
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#endif /*EMU_PIT_FAST_H*/
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