Sweden-Number/miscemu/ioports.c

87 lines
1.7 KiB
C

/*
* Emulation of processor ioports.
*
* Copyright 1995 Morten Welinder
*/
/* Known problems:
- only a few ports are emulated.
- real-time clock in "cmos" is bogus. A nifty alarm() setup could
fix that, I guess.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
#include "stddebug.h"
/* #define DEBUG_INT */
#include "debug.h"
static BYTE cmosaddress;
static BYTE cmosimage[64] =
{
0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x58,
0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
};
DWORD inport( int port, int count )
{
DWORD res = 0;
BYTE b;
dprintf_int(stddeb, "IO: %d bytes from port 0x%02x\n", count, port );
while (count-- > 0)
{
switch (port++)
{
case 0x70:
b = cmosaddress;
break;
case 0x71:
b = cmosimage[cmosaddress & 0x3f];
break;
default:
b = 0xff;
}
res = (res << 8) | b;
}
return res;
}
void outport( int port, int count, DWORD value )
{
BYTE b;
dprintf_int( stddeb, "IO: 0x%lx (%d bytes) to port 0x%02x\n",
value, count, port );
while (count-- > 0)
{
b = value & 0xff;
value >>= 8;
switch (port++)
{
case 0x70:
cmosaddress = b & 0x7f;
break;
case 0x71:
cmosimage[cmosaddress & 0x3f] = b;
break;
default:
/* Rien du tout. */
}
}
}