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Sweden-Number/msdos/ioports.c

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/*
* Emulation of processor ioports.
*
* Copyright 1995 Morten Welinder
* Copyright 1998 Andreas Mohr, Ove Kaaven
*/
/* 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 <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "windef.h"
#include "vga.h"
#include "dosexe.h"
#include "options.h"
#include "miscemu.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(int);
static struct {
WORD countmax;
BOOL16 byte_toggle; /* if TRUE, then hi byte has already been written */
WORD latch;
BOOL16 latched;
BYTE ctrlbyte_ch;
WORD oldval;
} tmr_8253[3] = {
{0xFFFF, FALSE, 0, FALSE, 0x06, 0},
{0x0012, FALSE, 0, FALSE, 0x44, 0},
{0x0001, FALSE, 0, FALSE, 0x86, 0},
};
static int dummy_ctr = 0;
static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
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, 0x19,
0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
};
#if defined(linux) && defined(__i386__)
# define DIRECT_IO_ACCESS
#else
# undef DIRECT_IO_ACCESS
#endif /* linux && __i386__ */
#ifdef DIRECT_IO_ACCESS
extern int iopl(int level);
static char do_direct_port_access = -1;
static char port_permissions[0x10000];
#define IO_READ 1
#define IO_WRITE 2
static void IO_FixCMOSCheckSum(void)
{
WORD sum = 0;
int i;
for (i=0x10; i < 0x2d; i++)
sum += cmosimage[i];
cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
cmosimage[0x2f] = sum & 0xff;
TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
}
#endif /* DIRECT_IO_ACCESS */
static void set_timer_maxval(unsigned timer, unsigned maxval)
{
switch (timer) {
case 0: /* System timer counter divisor */
DOSVM_SetTimer(maxval);
break;
case 1: /* RAM refresh */
FIXME("RAM refresh counter handling not implemented !");
break;
case 2: /* cassette & speaker */
/* speaker on ? */
if (((BYTE)parport_8255[1] & 3) == 3)
{
TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
Beep(1193180 / maxval, 20);
}
break;
}
}
/**********************************************************************
* IO_port_init
*/
/* set_IO_permissions(int val1, int val)
* Helper function for IO_port_init
*/
#ifdef DIRECT_IO_ACCESS
static void set_IO_permissions(int val1, int val, char rw)
{
int j;
if (val1 != -1) {
if (val == -1) val = 0x3ff;
for (j = val1; j <= val; j++)
port_permissions[j] |= rw;
do_direct_port_access = 1;
val1 = -1;
} else if (val != -1) {
do_direct_port_access = 1;
port_permissions[val] |= rw;
}
}
/* do_IO_port_init_read_or_write(char* temp, char rw)
* Helper function for IO_port_init
*/
static void do_IO_port_init_read_or_write(char* temp, char rw)
{
int val, val1, i, len;
if (!strcasecmp(temp, "all")) {
MESSAGE("Warning!!! Granting FULL IO port access to"
" windoze programs!\nWarning!!! "
"*** THIS IS NOT AT ALL "
"RECOMMENDED!!! ***\n");
for (i=0; i < sizeof(port_permissions); i++)
port_permissions[i] |= rw;
} else if (!(!strcmp(temp, "*") || *temp == '\0')) {
len = strlen(temp);
val = -1;
val1 = -1;
for (i = 0; i < len; i++) {
switch (temp[i]) {
case '0':
if (temp[i+1] == 'x' || temp[i+1] == 'X') {
sscanf(temp+i, "%x", &val);
i += 2;
} else {
sscanf(temp+i, "%d", &val);
}
while (isxdigit(temp[i]))
i++;
i--;
break;
case ',':
case ' ':
case '\t':
set_IO_permissions(val1, val, rw);
val1 = -1; val = -1;
break;
case '-':
val1 = val;
if (val1 == -1) val1 = 0;
break;
default:
if (temp[i] >= '0' && temp[i] <= '9') {
sscanf(temp+i, "%d", &val);
while (isdigit(temp[i]))
i++;
}
}
}
set_IO_permissions(val1, val, rw);
}
}
static inline BYTE inb( WORD port )
{
BYTE b;
__asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
return b;
}
static inline WORD inw( WORD port )
{
WORD w;
__asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
return w;
}
static inline DWORD inl( WORD port )
{
DWORD dw;
__asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
return dw;
}
static inline void outb( BYTE value, WORD port )
{
__asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
}
static inline void outw( WORD value, WORD port )
{
__asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
}
static inline void outl( DWORD value, WORD port )
{
__asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
}
static void IO_port_init(void)
{
char temp[1024];
do_direct_port_access = 0;
/* Can we do that? */
if (!iopl(3)) {
iopl(0);
PROFILE_GetWineIniString( "ports", "read", "*",
temp, sizeof(temp) );
do_IO_port_init_read_or_write(temp, IO_READ);
PROFILE_GetWineIniString( "ports", "write", "*",
temp, sizeof(temp) );
do_IO_port_init_read_or_write(temp, IO_WRITE);
}
IO_FixCMOSCheckSum();
}
#endif /* DIRECT_IO_ACCESS */
/**********************************************************************
* IO_inport
*
* Note: The size argument has to be handled correctly _externally_
* (as we always return a DWORD)
*/
DWORD IO_inport( int port, int size )
{
DWORD res = 0;
TRACE("%d-byte value from port 0x%02x\n", size, port );
#ifdef DIRECT_IO_ACCESS
if (do_direct_port_access == -1) IO_port_init();
if ((do_direct_port_access)
/* Make sure we have access to the port */
&& (port_permissions[port] & IO_READ))
{
iopl(3);
switch(size)
{
case 1: res = inb( port ); break;
case 2: res = inw( port ); break;
case 4: res = inl( port ); break;
default:
ERR("invalid data size %d\n", size);
}
iopl(0);
return res;
}
#endif
switch (port)
{
case 0x40:
case 0x41:
case 0x42:
{
BYTE chan = port & 3;
WORD tempval = 0;
if (tmr_8253[chan].latched)
tempval = tmr_8253[chan].latch;
else
{
dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
if (chan == 0) /* System timer counter divisor */
{
/* FIXME: DOSVM_GetTimer() returns quite rigid values */
tempval = dummy_ctr + (WORD)DOSVM_GetTimer();
}
else
{
/* FIXME: intelligent hardware timer emulation needed */
tempval = dummy_ctr;
}
}
switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
{
case 0:
res = 0; /* shouldn't happen? */
break;
case 1: /* read lo byte */
res = (BYTE)tempval;
tmr_8253[chan].latched = FALSE;
break;
case 3: /* read lo byte, then hi byte */
tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
if (tmr_8253[chan].byte_toggle)
{
res = (BYTE)tempval;
break;
}
/* else [fall through if read hi byte !] */
case 2: /* read hi byte */
res = (BYTE)(tempval >> 8);
tmr_8253[chan].latched = FALSE;
break;
}
}
break;
case 0x60:
res = INT_Int09ReadScan(NULL);
#if 0 /* what's this port got to do with parport ? */
res = (DWORD)parport_8255[0];
#endif
break;
case 0x61:
res = (DWORD)parport_8255[1];
break;
case 0x62:
res = (DWORD)parport_8255[2];
break;
case 0x70:
res = (DWORD)cmosaddress;
break;
case 0x71:
res = (DWORD)cmosimage[cmosaddress & 0x3f];
break;
case 0x200:
case 0x201:
res = 0xffffffff; /* no joystick */
break;
case 0x3ba:
case 0x3da:
res = (DWORD)VGA_ioport_in( port );
break;
default:
WARN("Direct I/O read attempted from port %x\n", port);
res = 0xffffffff;
break;
}
TRACE(" returning ( 0x%lx )\n", res );
return res;
}
/**********************************************************************
* IO_outport
*/
void IO_outport( int port, int size, DWORD value )
{
TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
value, size, port );
#ifdef DIRECT_IO_ACCESS
if (do_direct_port_access == -1) IO_port_init();
if ((do_direct_port_access)
/* Make sure we have access to the port */
&& (port_permissions[port] & IO_WRITE))
{
iopl(3);
switch(size)
{
case 1: outb( LOBYTE(value), port ); break;
case 2: outw( LOWORD(value), port ); break;
case 4: outl( value, port ); break;
default:
WARN("Invalid data size %d\n", size);
}
iopl(0);
return;
}
#endif
switch (port)
{
case 0x20:
DOSVM_PIC_ioport_out( port, (BYTE)value );
break;
case 0x40:
case 0x41:
case 0x42:
{
BYTE chan = port & 3;
/* we need to get the oldval before any lo/hi byte change has been made */
if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
!tmr_8253[chan].byte_toggle)
tmr_8253[chan].oldval = tmr_8253[chan].countmax;
switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
{
case 0:
break; /* shouldn't happen? */
case 1: /* write lo byte */
tmr_8253[chan].countmax =
(tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
break;
case 3: /* write lo byte, then hi byte */
tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
if (tmr_8253[chan].byte_toggle)
{
tmr_8253[chan].countmax =
(tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
break;
}
/* else [fall through if write hi byte !] */
case 2: /* write hi byte */
tmr_8253[chan].countmax =
(tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
break;
}
/* if programming is finished and value has changed
then update to new value */
if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
!tmr_8253[chan].byte_toggle) &&
(tmr_8253[chan].countmax != tmr_8253[chan].oldval))
set_timer_maxval(chan, tmr_8253[chan].countmax);
}
break;
case 0x43:
{
BYTE chan = ((BYTE)value & 0xc0) >> 6;
/* ctrl byte for specific timer channel */
if (chan == 3)
{
FIXME("8254 timer readback not implemented yet\n");
break;
}
switch (((BYTE)value & 0x30) >> 4)
{
case 0: /* latch timer */
tmr_8253[chan].latched = TRUE;
dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
if (chan == 0) /* System timer divisor */
tmr_8253[chan].latch = dummy_ctr + (WORD)DOSVM_GetTimer();
else
{
/* FIXME: intelligent hardware timer emulation needed */
tmr_8253[chan].latch = dummy_ctr;
}
break;
case 3: /* write lo byte, then hi byte */
tmr_8253[chan].byte_toggle = FALSE; /* init */
/* fall through */
case 1: /* write lo byte only */
case 2: /* write hi byte only */
tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
break;
}
}
break;
case 0x61:
parport_8255[1] = (BYTE)value;
if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
{
TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
Beep(1193180 / tmr_8253[2].countmax, 20);
}
break;
case 0x70:
cmosaddress = (BYTE)value & 0x7f;
break;
case 0x71:
cmosimage[cmosaddress & 0x3f] = (BYTE)value;
break;
case 0x3c8:
case 0x3c9:
VGA_ioport_out( port, (BYTE)value );
break;
default:
WARN("Direct I/O write attempted to port %x\n", port );
break;
}
}
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