119 lines
2.9 KiB
C
119 lines
2.9 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_H
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# define EMU_PIT_H
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typedef struct {
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uint8_t m, ctrl,
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read_status, latch,
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s1_det, l_det,
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bcd, pad;
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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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state, null_count, do_read_status;
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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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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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} ctr_t;
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typedef struct PIT {
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int flags, clock;
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pc_timer_t callback_timer;
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ctr_t counters[3];
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uint8_t ctrl;
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} pit_t;
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extern pit_t *pit,
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*pit2;
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extern double SYSCLK, PCICLK, AGPCLK;
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extern uint64_t PITCONST, ISACONST,
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CGACONST,
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MDACONST,
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HERCCONST,
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VGACONST1,
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VGACONST2,
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RTCCONST, ACPICONST;
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extern int refresh_at_enable;
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/* Gets a counter's count. */
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extern uint16_t pit_ctr_get_count(ctr_t *ctr);
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/* Sets a counter's load count handler. */
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extern void pit_ctr_set_load_func(ctr_t *ctr, void (*func)(uint8_t new_m, int new_count));
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/* Sets a counter's OUT output handler. */
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extern void pit_ctr_set_out_func(ctr_t *ctr, void (*func)(int new_out, int old_out));
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/* Sets a counter's GATE input. */
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extern void pit_ctr_set_gate(ctr_t *ctr, int gate);
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/* Sets a counter's CLOCK input. */
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extern void pit_ctr_set_clock(ctr_t *ctr, int clock);
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/* Sets if a counter's CLOCK input is from the timer or not - used by PCjr. */
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extern void pit_ctr_set_using_timer(ctr_t *ctr, int using_timer);
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extern pit_t * pit_common_init(int type, void (*out0)(int new_out, int old_out), void (*out1)(int new_out, int old_out));
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extern pit_t * pit_ps2_init(void);
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extern void pit_reset(pit_t *dev);
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extern void pit_irq0_timer(int new_out, int old_out);
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extern void pit_irq0_timer_pcjr(int new_out, int old_out);
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extern void pit_irq0_timer_ps2(int new_out, int old_out);
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extern void pit_refresh_timer_xt(int new_out, int old_out);
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extern void pit_refresh_timer_at(int new_out, int old_out);
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extern void pit_speaker_timer(int new_out, int old_out);
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extern void pit_nmi_timer_ps2(int new_out, int old_out);
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extern void pit_set_clock(int clock);
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extern void pit_handler(int set, uint16_t base, int size, void *priv);
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#ifdef EMU_DEVICE_H
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extern const device_t i8253_device;
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extern const device_t i8254_device;
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extern const device_t i8254_sec_device;
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extern const device_t i8254_ext_io_device;
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extern const device_t i8254_ps2_device;
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#endif
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#endif /*EMU_PIT_H*/
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