Files
86Box/src/video/vid_av9194.c
2023-07-25 17:59:22 -04:00

111 lines
2.4 KiB
C

/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* AV9194 clock generator emulation.
*
* Used by the S3 86c801 (V7-Mirage) card.
*
*
*
* Authors: Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2016-2018 Miran Grca.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/device.h>
#include <86box/mem.h>
#include <86box/timer.h>
#include <86box/video.h>
#include <86box/vid_svga.h>
#include <86box/plat_unused.h>
float
av9194_getclock(int clock, UNUSED(void *priv))
{
float ret = 0.0;
switch (clock & 0x0f) {
case 0:
ret = 25175000.0;
break;
case 1:
ret = 28322000.0;
break;
case 2:
ret = 40000000.0;
break;
case 4:
ret = 50000000.0;
break;
case 5:
ret = 77000000.0;
break;
case 6:
ret = 36000000.0;
break;
case 7:
ret = 44900000.0;
break;
case 8:
ret = 130000000.0;
break;
case 9:
ret = 120000000.0;
break;
case 0xa:
ret = 80000000.0;
break;
case 0xb:
ret = 31500000.0;
break;
case 0xc:
ret = 110000000.0;
break;
case 0xd:
ret = 65000000.0;
break;
case 0xe:
ret = 75000000.0;
break;
case 0xf:
ret = 94500000.0;
break;
default:
break;
}
return ret;
}
static void *
av9194_init(UNUSED(const device_t *info))
{
/* Return something non-NULL. */
return (void *) &av9194_device;
}
const device_t av9194_device = {
.name = "AV9194 Clock Generator",
.internal_name = "av9194",
.flags = 0,
.local = 0,
.init = av9194_init,
.close = NULL,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};