111 lines
2.4 KiB
C
111 lines
2.4 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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* AV9194 clock generator emulation.
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*
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* Used by the S3 86c801 (V7-Mirage) card.
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*
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*
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*
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* Authors: Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2016-2018 Miran Grca.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/device.h>
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#include <86box/mem.h>
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#include <86box/timer.h>
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#include <86box/video.h>
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#include <86box/vid_svga.h>
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#include <86box/plat_unused.h>
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float
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av9194_getclock(int clock, UNUSED(void *priv))
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{
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float ret = 0.0;
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switch (clock & 0x0f) {
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case 0:
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ret = 25175000.0;
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break;
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case 1:
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ret = 28322000.0;
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break;
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case 2:
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ret = 40000000.0;
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break;
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case 4:
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ret = 50000000.0;
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break;
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case 5:
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ret = 77000000.0;
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break;
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case 6:
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ret = 36000000.0;
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break;
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case 7:
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ret = 44900000.0;
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break;
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case 8:
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ret = 130000000.0;
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break;
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case 9:
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ret = 120000000.0;
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break;
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case 0xa:
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ret = 80000000.0;
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break;
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case 0xb:
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ret = 31500000.0;
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break;
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case 0xc:
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ret = 110000000.0;
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break;
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case 0xd:
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ret = 65000000.0;
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break;
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case 0xe:
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ret = 75000000.0;
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break;
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case 0xf:
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ret = 94500000.0;
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break;
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default:
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break;
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}
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return ret;
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}
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static void *
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av9194_init(UNUSED(const device_t *info))
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{
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/* Return something non-NULL. */
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return (void *) &av9194_device;
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}
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const device_t av9194_device = {
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.name = "AV9194 Clock Generator",
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.internal_name = "av9194",
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.flags = 0,
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.local = 0,
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.init = av9194_init,
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.close = NULL,
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.reset = NULL,
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{ .available = NULL },
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.speed_changed = NULL,
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.force_redraw = NULL,
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.config = NULL
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};
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