120 lines
2.3 KiB
C
120 lines
2.3 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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* ICS2494 clock generator emulation.
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*
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* Used by the AMI S3 924.
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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 2020 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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typedef struct ics2494_t
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{
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float freq[16];
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} ics2494_t;
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#ifdef ENABLE_ics2494_LOG
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int ics2494_do_log = ENABLE_ics2494_LOG;
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static void
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ics2494_log(const char *fmt, ...)
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{
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va_list ap;
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if (ics2494_do_log) {
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va_start(ap, fmt);
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pclog_ex(fmt, ap);
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va_end(ap);
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}
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}
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#else
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#define ics2494_log(fmt, ...)
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#endif
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float
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ics2494_getclock(int clock, void *p)
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{
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ics2494_t *ics2494 = (ics2494_t *) p;
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if (clock > 16)
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clock = 16;
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return ics2494->freq[clock];
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}
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static void *
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ics2494_init(const device_t *info)
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{
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ics2494_t *ics2494 = (ics2494_t *) malloc(sizeof(ics2494_t));
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memset(ics2494, 0, sizeof(ics2494_t));
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switch (info->local) {
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case 305:
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/* ICS2494A(N)-205 for S3 86C924 */
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ics2494->freq[0x0] = 25175000.0;
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ics2494->freq[0x1] = 28322000.0;
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ics2494->freq[0x2] = 40000000.0;
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ics2494->freq[0x3] = 0.0;
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ics2494->freq[0x4] = 50000000.0;
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ics2494->freq[0x5] = 77000000.0;
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ics2494->freq[0x6] = 36000000.0;
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ics2494->freq[0x7] = 44889000.0;
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ics2494->freq[0x8] = 130000000.0;
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ics2494->freq[0x9] = 120000000.0;
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ics2494->freq[0xa] = 80000000.0;
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ics2494->freq[0xb] = 31500000.0;
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ics2494->freq[0xc] = 110000000.0;
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ics2494->freq[0xd] = 65000000.0;
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ics2494->freq[0xe] = 75000000.0;
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ics2494->freq[0xf] = 94500000.0;
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break;
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}
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return ics2494;
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}
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static void
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ics2494_close(void *priv)
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{
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ics2494_t *ics2494 = (ics2494_t *) priv;
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if (ics2494)
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free(ics2494);
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}
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const device_t ics2494an_305_device = {
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.name = "ICS2494AN-305 Clock Generator",
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.internal_name = "ics2494an_305",
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.flags = 0,
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.local = 305,
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.init = ics2494_init,
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.close = ics2494_close,
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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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