471 lines
12 KiB
C
471 lines
12 KiB
C
/*
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* Emulation of processor ioports.
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*
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* Copyright 1995 Morten Welinder
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* Copyright 1998 Andreas Mohr, Ove Kaaven
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*/
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/* Known problems:
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- only a few ports are emulated.
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- real-time clock in "cmos" is bogus. A nifty alarm() setup could
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fix that, I guess.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "windows.h"
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#include "vga.h"
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#include "dosexe.h"
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#include "options.h"
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#include "debug.h"
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static WORD tmr_8253_countmax[3] = {0xffff, 0x12, 1}; /* [2] needs to be 1 ! */
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/* if byte_toggle is TRUE, then hi byte has already been written */
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static BOOL16 tmr_8253_byte_toggle[3] = {FALSE, FALSE, FALSE};
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static WORD tmr_8253_latch[3] = {0, 0, 0};
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/* 4th contents are dummy */
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static BOOL16 tmr_8253_latched[4] = {FALSE, FALSE, FALSE, FALSE};
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static BYTE tmr_8253_ctrlbyte_ch[4] = {0x06, 0x44, 0x86, 0};
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static int dummy_ctr = 0;
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static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
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static BYTE cmosaddress;
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static BYTE cmosimage[64] =
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{
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0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
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0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
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0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
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0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
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0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
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0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
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0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
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};
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#if defined(linux) && defined(__i386__)
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# define DIRECT_IO_ACCESS
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#else
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# undef DIRECT_IO_ACCESS
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#endif /* linux && __i386__ */
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#ifdef DIRECT_IO_ACCESS
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extern int iopl(int level);
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static char do_direct_port_access = 0;
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static char port_permissions[0x10000];
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#define IO_READ 1
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#define IO_WRITE 2
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#endif /* DIRECT_IO_ACCESS */
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static void IO_FixCMOSCheckSum(void)
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{
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WORD sum = 0;
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int i;
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for (i=0x10; i < 0x2d; i++)
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sum += cmosimage[i];
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cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
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cmosimage[0x2f] = sum & 0xff;
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TRACE(int, "calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
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}
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static void set_timer_maxval(unsigned timer, unsigned maxval)
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{
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switch (timer) {
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case 0: /* System timer counter divisor */
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DOSVM_SetTimer(maxval);
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break;
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case 1: /* RAM refresh */
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FIXME(int, "RAM refresh counter handling not implemented !");
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break;
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case 2: /* cassette & speaker */
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/* speaker on ? */
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if (((BYTE)parport_8255[1] & 3) == 3)
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{
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TRACE(int, "Beep (freq: %d) !\n", 1193180 / maxval );
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Beep(1193180 / maxval, 20);
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}
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break;
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}
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}
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/**********************************************************************
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* IO_port_init
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*/
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/* set_IO_permissions(int val1, int val)
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* Helper function for IO_port_init
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*/
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#ifdef DIRECT_IO_ACCESS
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static void set_IO_permissions(int val1, int val, char rw)
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{
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int j;
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if (val1 != -1) {
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if (val == -1) val = 0x3ff;
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for (j = val1; j <= val; j++)
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port_permissions[j] |= rw;
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do_direct_port_access = 1;
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val1 = -1;
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} else if (val != -1) {
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do_direct_port_access = 1;
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port_permissions[val] |= rw;
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}
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}
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/* do_IO_port_init_read_or_write(char* temp, char rw)
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* Helper function for IO_port_init
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*/
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static void do_IO_port_init_read_or_write(char* temp, char rw)
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{
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int val, val1, i, len;
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if (!strcasecmp(temp, "all")) {
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MSG("Warning!!! Granting FULL IO port access to"
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" windoze programs!\nWarning!!! "
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"*** THIS IS NOT AT ALL "
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"RECOMMENDED!!! ***\n");
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for (i=0; i < sizeof(port_permissions); i++)
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port_permissions[i] |= rw;
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} else if (!(!strcmp(temp, "*") || *temp == '\0')) {
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len = strlen(temp);
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val = -1;
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val1 = -1;
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for (i = 0; i < len; i++) {
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switch (temp[i]) {
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case '0':
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if (temp[i+1] == 'x' || temp[i+1] == 'X') {
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sscanf(temp+i, "%x", &val);
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i += 2;
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} else {
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sscanf(temp+i, "%d", &val);
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}
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while (isxdigit(temp[i]))
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i++;
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i--;
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break;
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case ',':
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case ' ':
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case '\t':
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set_IO_permissions(val1, val, rw);
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val1 = -1; val = -1;
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break;
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case '-':
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val1 = val;
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if (val1 == -1) val1 = 0;
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break;
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default:
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if (temp[i] >= '0' && temp[i] <= '9') {
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sscanf(temp+i, "%d", &val);
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while (isdigit(temp[i]))
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i++;
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}
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}
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}
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set_IO_permissions(val1, val, rw);
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}
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}
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static __inline__ BYTE inb( WORD port )
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{
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BYTE b;
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__asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
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return b;
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}
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static __inline__ WORD inw( WORD port )
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{
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WORD w;
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__asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
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return w;
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}
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static __inline__ DWORD inl( WORD port )
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{
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DWORD dw;
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__asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
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return dw;
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}
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static __inline__ void outb( BYTE value, WORD port )
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{
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__asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
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}
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static __inline__ void outw( WORD value, WORD port )
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{
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__asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
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}
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static __inline__ void outl( DWORD value, WORD port )
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{
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__asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
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}
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#endif /* DIRECT_IO_ACCESS */
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void IO_port_init()
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{
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#ifdef DIRECT_IO_ACCESS
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char temp[1024];
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/* Can we do that? */
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if (!iopl(3)) {
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iopl(0);
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PROFILE_GetWineIniString( "ports", "read", "*",
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temp, sizeof(temp) );
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do_IO_port_init_read_or_write(temp, IO_READ);
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PROFILE_GetWineIniString( "ports", "write", "*",
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temp, sizeof(temp) );
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do_IO_port_init_read_or_write(temp, IO_WRITE);
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}
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#endif /* DIRECT_IO_ACCESS */
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IO_FixCMOSCheckSum();
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}
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/**********************************************************************
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* IO_inport
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*
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* Note: The size argument has to be handled correctly _externally_
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* (as we always return a DWORD)
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*/
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DWORD IO_inport( int port, int size )
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{
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DWORD res = 0;
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TRACE(int, "%d-byte value from port 0x%02x\n", size, port );
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#ifdef DIRECT_IO_ACCESS
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if ((do_direct_port_access)
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/* Make sure we have access to the port */
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&& (port_permissions[port] & IO_READ))
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{
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iopl(3);
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switch(size)
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{
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case 1: res = inb( port ); break;
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case 2: res = inw( port ); break;
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case 4: res = inl( port ); break;
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default:
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ERR(int, "invalid data size %d\n", size);
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}
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iopl(0);
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return res;
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}
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#endif
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switch (port)
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{
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case 0x3ba:
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case 0x3da:
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res = (DWORD)VGA_ioport_in( port );
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break;
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case 0x40:
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case 0x41:
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case 0x42:
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{
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BYTE chan = port & 3;
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WORD tempval = 0;
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if (tmr_8253_latched[chan] == TRUE)
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{
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tempval = tmr_8253_latch[chan];
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tmr_8253_latched[chan] = FALSE;
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}
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else
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{
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dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
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if (chan == 0) /* System timer counter divisor */
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/* FIXME: DOSVM_GetTimer() returns quite rigid values */
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tempval = dummy_ctr+(WORD)DOSVM_GetTimer();
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else
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{ /* FIXME: intelligent hardware timer emulation needed */
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tempval = dummy_ctr;
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}
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}
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switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
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{
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case 0x00:
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break; /* correct ? */
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case 0x10: /* read lo byte */
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res = (BYTE)tempval;
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break;
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case 0x30: /* read lo byte, then hi byte */
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tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
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if (tmr_8253_byte_toggle[chan] == TRUE)
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{
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res = (BYTE)tempval;
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break;
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}
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/* else [fall through if read hi byte !] */
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case 0x20: /* read hi byte */
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res = (BYTE)tempval>>8;
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break;
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}
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break;
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}
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case 0x60:
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res = (DWORD)parport_8255[0];
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break;
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case 0x61:
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res = (DWORD)parport_8255[1];
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break;
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case 0x62:
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res = (DWORD)parport_8255[2];
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break;
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case 0x70:
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res = (DWORD)cmosaddress;
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break;
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case 0x71:
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res = (DWORD)cmosimage[cmosaddress & 0x3f];
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break;
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case 0x200:
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case 0x201:
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res = 0xffffffff; /* no joystick */
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break;
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default:
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WARN( int, "Direct I/O read attempted from port %x\n", port);
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res = 0xffffffff;
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break;
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}
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TRACE(int, " returning ( 0x%lx )\n", res );
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return res;
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}
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/**********************************************************************
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* IO_outport
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*/
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void IO_outport( int port, int size, DWORD value )
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{
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TRACE(int, "IO: 0x%lx (%d-byte value) to port 0x%02x\n",
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value, size, port );
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#ifdef DIRECT_IO_ACCESS
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if ((do_direct_port_access)
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/* Make sure we have access to the port */
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&& (port_permissions[port] & IO_WRITE))
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{
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iopl(3);
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switch(size)
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{
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case 1: outb( LOBYTE(value), port ); break;
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case 2: outw( LOWORD(value), port ); break;
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case 4: outl( value, port ); break;
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default:
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WARN(int, "Invalid data size %d\n", size);
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}
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iopl(0);
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return;
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}
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#endif
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switch (port)
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{
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case 0x3c8:
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case 0x3c9:
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VGA_ioport_out( port, (BYTE)value );
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break;
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case 0x40:
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case 0x41:
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case 0x42:
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{
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BYTE chan = port & 3;
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WORD oldval = 0;
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if ( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
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/* we need to get the oldval before any lo/hi byte change has been made */
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(tmr_8253_byte_toggle[chan] == FALSE) )
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oldval = tmr_8253_countmax[chan];
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switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
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{
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case 0x00:
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break; /* correct ? */
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case 0x10: /* write lo byte */
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tmr_8253_countmax[chan] =
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(tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
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break;
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case 0x30: /* write lo byte, then hi byte */
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tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
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if (tmr_8253_byte_toggle[chan] == TRUE)
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{
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tmr_8253_countmax[chan] =
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(tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
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break;
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}
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/* else [fall through if write hi byte !] */
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case 0x20: /* write hi byte */
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tmr_8253_countmax[chan] =
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(tmr_8253_countmax[chan] & 0xff)|((BYTE)value << 8);
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break;
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}
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if (
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/* programming finished ? */
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( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
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(tmr_8253_byte_toggle[chan] == FALSE) )
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/* update to new value ? */
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&& (tmr_8253_countmax[chan] != oldval)
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)
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set_timer_maxval(chan, tmr_8253_countmax[chan]);
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}
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break;
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case 0x43:
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{
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BYTE chan = ((BYTE)value & 0xc0) >> 6;
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/* ctrl byte for specific timer channel */
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tmr_8253_ctrlbyte_ch[chan] = (BYTE)value;
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if (chan == 3) {
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FIXME(int,"8254 timer readback not implemented yet\n");
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}
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else
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if (((BYTE)value&0x30)==0) { /* latch timer */
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tmr_8253_latched[chan] = TRUE;
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dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
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if (chan == 0) /* System timer divisor */
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tmr_8253_latch[0] = dummy_ctr+(WORD)DOSVM_GetTimer();
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else
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{ /* FIXME: intelligent hardware timer emulation needed */
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tmr_8253_latch[chan] = dummy_ctr;
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}
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}
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if ((value & 0x30) == 0x30) /* write lo byte, then hi byte */
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tmr_8253_byte_toggle[((BYTE)value & 0xc0) >> 6] = FALSE; /* init */
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}
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break;
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case 0x61:
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parport_8255[1] = (BYTE)value;
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if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253_countmax[2] != 1))
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{
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TRACE(int, "Beep (freq: %d) !\n", 1193180 / tmr_8253_countmax[2]);
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Beep(1193180 / tmr_8253_countmax[2], 20);
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}
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break;
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case 0x70:
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cmosaddress = (BYTE)value & 0x7f;
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break;
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case 0x71:
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cmosimage[cmosaddress & 0x3f] = (BYTE)value;
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break;
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default:
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WARN(int, "Direct I/O write attempted to port %x\n", port );
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break;
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}
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}
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