dlls/winedos/ioports.c

   1 /*
   2  * Emulation of processor ioports.
   3  *
   4  * Copyright 1995 Morten Welinder
   5  * Copyright 1998 Andreas Mohr, Ove Kaaven
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* Known problems:
  23    - only a few ports are emulated.
  24    - real-time clock in "cmos" is bogus.  A nifty alarm() setup could
  25      fix that, I guess.
  26 */
  27
  28 #include "config.h"
  29
  30 #include <stdarg.h>
  31 #include <stdlib.h>
  32
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "winnls.h"
  36 #include "winreg.h"
  37 #include "winternl.h"
  38 #include "dosexe.h"
  39 #include "vga.h"
  40 #include "wine/unicode.h"
  41 #include "wine/debug.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(int);
  44
  45 #if defined(linux) && defined(__i386__)
  46 # define DIRECT_IO_ACCESS
  47 #else
  48 # undef DIRECT_IO_ACCESS
  49 #endif  /* linux && __i386__ */
  50
  51 static struct {
  52     WORD        countmax;
  53     BOOL16      byte_toggle; /* if TRUE, then hi byte has already been written */
  54     WORD        latch;
  55     BOOL16      latched;
  56     BYTE        ctrlbyte_ch;
  57     WORD        oldval;
  58 } tmr_8253[3] = {
  59     {0xFFFF,    FALSE,  0,      FALSE,  0x36,   0},
  60     {0x0012,    FALSE,  0,      FALSE,  0x74,   0},
  61     {0x0001,    FALSE,  0,      FALSE,  0xB6,   0},
  62 };
  63
  64 static int dummy_ctr = 0;
  65
  66 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  67
  68 static BYTE cmosaddress;
  69
  70 /* if you change anything here, use IO_FixCMOSCheckSum below to compute
  71  * the checksum and put the right values in.
  72  */
  73 static BYTE cmosimage[64] =
  74 {
  75   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  76   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  77   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  78   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  79   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  80   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,  /* last 2 bytes are checksum */
  81   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  82   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  83 };
  84
  85 #if 0
  86 static void IO_FixCMOSCheckSum(void)
  87 {
  88         WORD sum = 0;
  89         int i;
  90
  91         for (i=0x10; i < 0x2d; i++)
  92                 sum += cmosimage[i];
  93         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
  94         cmosimage[0x2f] = sum & 0xff;
  95         MESSAGE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
  96 }
  97 #endif
  98
  99 #ifdef DIRECT_IO_ACCESS
 100
 101 extern int iopl(int level);
 102 static char do_direct_port_access = -1;
 103 static char port_permissions[0x10000];
 104
 105 #define IO_READ  1
 106 #define IO_WRITE 2
 107
 108 #endif  /* DIRECT_IO_ACCESS */
 109
 110 #ifdef HAVE_PPDEV
 111 static int do_pp_port_access = -1; /* -1: uninitialized, 1: not available
 112                                        0: available);*/
 113 #endif
 114
 115 static void set_timer_maxval(unsigned timer, unsigned maxval)
 116 {
 117     switch (timer) {
 118         case 0: /* System timer counter divisor */
 119             DOSVM_SetTimer(maxval);
 120             break;
 121         case 1: /* RAM refresh */
 122             FIXME("RAM refresh counter handling not implemented !\n");
 123             break;
 124         case 2: /* cassette & speaker */
 125             /* speaker on ? */
 126             if ((parport_8255[1] & 3) == 3)
 127             {
 128                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 129                 Beep(1193180 / maxval, 20);
 130             }
 131             break;
 132     }
 133 }
 134
 135
 136 /**********************************************************************
 137  *          IO_port_init
 138  */
 139
 140 /* set_IO_permissions(int val1, int val)
 141  * Helper function for IO_port_init
 142  */
 143 #ifdef DIRECT_IO_ACCESS
 144 static void set_IO_permissions(int val1, int val, char rw)
 145 {
 146         int j;
 147         if (val1 != -1) {
 148                 if (val == -1) val = 0x3ff;
 149                 for (j = val1; j <= val; j++)
 150                         port_permissions[j] |= rw;
 151
 152                 do_direct_port_access = 1;
 153
 154                 val1 = -1;
 155         } else if (val != -1) {
 156                 do_direct_port_access = 1;
 157
 158                 port_permissions[val] |= rw;
 159         }
 160
 161 }
 162
 163 /* do_IO_port_init_read_or_write(char* temp, char rw)
 164  * Helper function for IO_port_init
 165  */
 166
 167 static void do_IO_port_init_read_or_write(const WCHAR *str, char rw)
 168 {
 169     int val, val1;
 170     unsigned int i;
 171     WCHAR *end;
 172     static const WCHAR allW[] = {'a','l','l',0};
 173
 174     if (!strcmpiW(str, allW))
 175     {
 176         for (i=0; i < sizeof(port_permissions); i++)
 177             port_permissions[i] |= rw;
 178     }
 179     else
 180     {
 181         val = -1;
 182         val1 = -1;
 183         while (*str)
 184         {
 185             switch(*str)
 186             {
 187             case ',':
 188             case ' ':
 189             case '\t':
 190                 set_IO_permissions(val1, val, rw);
 191                 val1 = -1;
 192                 val = -1;
 193                 str++;
 194                 break;
 195             case '-':
 196                 val1 = val;
 197                 if (val1 == -1) val1 = 0;
 198                 str++;
 199                 break;
 200             default:
 201                 if (isdigitW(*str))
 202                 {
 203                     val = strtoulW( str, &end, 0 );
 204                     if (end == str)
 205                     {
 206                         val = -1;
 207                         str++;
 208                     }
 209                     else str = end;
 210                 }
 211                 break;
 212             }
 213         }
 214         set_IO_permissions(val1, val, rw);
 215     }
 216 }
 217
 218 static inline BYTE inb( WORD port )
 219 {
 220     BYTE b;
 221     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 222     return b;
 223 }
 224
 225 static inline WORD inw( WORD port )
 226 {
 227     WORD w;
 228     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 229     return w;
 230 }
 231
 232 static inline DWORD inl( WORD port )
 233 {
 234     DWORD dw;
 235     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 236     return dw;
 237 }
 238
 239 static inline void outb( BYTE value, WORD port )
 240 {
 241     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 242 }
 243
 244 static inline void outw( WORD value, WORD port )
 245 {
 246     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 247 }
 248
 249 static inline void outl( DWORD value, WORD port )
 250 {
 251     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 252 }
 253
 254 static void IO_port_init(void)
 255 {
 256     char tmp[1024];
 257     HKEY hkey;
 258     DWORD dummy;
 259     OBJECT_ATTRIBUTES attr;
 260     UNICODE_STRING nameW;
 261
 262     static const WCHAR portsW[] = {'M','a','c','h','i','n','e','\\',
 263                                    'S','o','f','t','w','a','r','e','\\',
 264                                    'W','i','n','e','\\','W','i','n','e','\\',
 265                                    'C','o','n','f','i','g','\\','P','o','r','t','s',0};
 266     static const WCHAR readW[] = {'r','e','a','d',0};
 267     static const WCHAR writeW[] = {'w','r','i','t','e',0};
 268
 269     do_direct_port_access = 0;
 270     /* Can we do that? */
 271     if (!iopl(3))
 272     {
 273         iopl(0);
 274
 275         attr.Length = sizeof(attr);
 276         attr.RootDirectory = 0;
 277         attr.ObjectName = &nameW;
 278         attr.Attributes = 0;
 279         attr.SecurityDescriptor = NULL;
 280         attr.SecurityQualityOfService = NULL;
 281         RtlInitUnicodeString( &nameW, portsW );
 282
 283         if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ))
 284         {
 285             RtlInitUnicodeString( &nameW, readW );
 286             if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 287             {
 288                 WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 289                 do_IO_port_init_read_or_write(str, IO_READ);
 290             }
 291             RtlInitUnicodeString( &nameW, writeW );
 292             if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 293             {
 294                 WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 295                 do_IO_port_init_read_or_write(str, IO_WRITE);
 296             }
 297             NtClose( hkey );
 298         }
 299     }
 300 }
 301
 302 #endif  /* DIRECT_IO_ACCESS */
 303
 304
 305 /**********************************************************************
 306  *          inport   (WINEDOS.@)
 307  *
 308  * Note: The size argument has to be handled correctly _externally_
 309  * (as we always return a DWORD)
 310  */
 311 DWORD WINAPI DOSVM_inport( int port, int size )
 312 {
 313     DWORD res = ~0U;
 314
 315     TRACE("%d-byte value from port 0x%04x\n", size, port );
 316
 317 #ifdef HAVE_PPDEV
 318     if (do_pp_port_access == -1) do_pp_port_access =IO_pp_init();
 319     if ((do_pp_port_access == 0 ) && (size == 1))
 320     {
 321         if (!IO_pp_inp(port,&res)) return res;
 322     }
 323 #endif
 324
 325 #ifdef DIRECT_IO_ACCESS
 326     if (do_direct_port_access == -1) IO_port_init();
 327     if ((do_direct_port_access)
 328         /* Make sure we have access to the port */
 329         && (port_permissions[port] & IO_READ))
 330     {
 331         iopl(3);
 332         switch(size)
 333         {
 334         case 1: res = inb( port ); break;
 335         case 2: res = inw( port ); break;
 336         case 4: res = inl( port ); break;
 337         }
 338         iopl(0);
 339         return res;
 340     }
 341 #endif
 342
 343     switch (port)
 344     {
 345     case 0x40:
 346     case 0x41:
 347     case 0x42:
 348         {
 349             BYTE chan = port & 3;
 350             WORD tempval = 0;
 351             if (tmr_8253[chan].latched)
 352                 tempval = tmr_8253[chan].latch;
 353             else
 354             {
 355                 dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 356                 if (chan == 0) /* System timer counter divisor */
 357                 {
 358                     /* FIXME: DOSVM_GetTimer() returns quite rigid values */
 359                     tempval = dummy_ctr + (WORD)DOSVM_GetTimer();
 360                 }
 361                 else
 362                 {
 363                     /* FIXME: intelligent hardware timer emulation needed */
 364                     tempval = dummy_ctr;
 365                 }
 366             }
 367
 368             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 369             {
 370             case 0:
 371                 res = 0; /* shouldn't happen? */
 372                 break;
 373             case 1: /* read lo byte */
 374                 res = (BYTE)tempval;
 375                 tmr_8253[chan].latched = FALSE;
 376                 break;
 377             case 3: /* read lo byte, then hi byte */
 378                 tmr_8253[chan].byte_toggle ^= 1; /* toggle */
 379                 if (tmr_8253[chan].byte_toggle)
 380                 {
 381                     res = (BYTE)tempval;
 382                     break;
 383                 }
 384                 /* else [fall through if read hi byte !] */
 385             case 2: /* read hi byte */
 386                 res = (BYTE)(tempval >> 8);
 387                 tmr_8253[chan].latched = FALSE;
 388                 break;
 389             }
 390         }
 391         break;
 392     case 0x60:
 393         res = DOSVM_Int09ReadScan(NULL);
 394         break;
 395     case 0x61:
 396         res = (DWORD)parport_8255[1];
 397         break;
 398     case 0x62:
 399         res = (DWORD)parport_8255[2];
 400         break;
 401     case 0x70:
 402         res = (DWORD)cmosaddress;
 403         break;
 404     case 0x71:
 405         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 406         break;
 407     case 0x200:
 408     case 0x201:
 409         res = ~0U; /* no joystick */
 410         break;
 411     case 0x22a:
 412     case 0x22c:
 413     case 0x22e:
 414         res = (DWORD)SB_ioport_in( port );
 415         break;
 416     case 0x3ba:
 417     case 0x3c0:
 418     case 0x3c1:
 419     case 0x3c2:
 420     case 0x3c3:
 421     case 0x3c4:
 422     case 0x3c5:
 423     case 0x3c6:
 424     case 0x3c7:
 425     case 0x3c8:
 426     case 0x3c9:
 427     case 0x3ca:
 428     case 0x3cb:
 429     case 0x3cc:
 430     case 0x3cd:
 431     case 0x3ce:
 432     case 0x3cf:
 433     case 0x3d0:
 434     case 0x3d1:
 435     case 0x3d2:
 436     case 0x3d3:
 437     case 0x3d4:
 438     case 0x3d5:
 439     case 0x3d6:
 440     case 0x3d7:
 441     case 0x3d8:
 442     case 0x3d9:
 443     case 0x3da:
 444     case 0x3db:
 445     case 0x3dc:
 446     case 0x3dd:
 447     case 0x3de:
 448     case 0x3df:
 449         if(size > 1)
 450            FIXME("Trying to read more than one byte from VGA!\n");
 451         res = (DWORD)VGA_ioport_in( port );
 452         break;
 453     case 0x00:
 454     case 0x01:
 455     case 0x02:
 456     case 0x03:
 457     case 0x04:
 458     case 0x05:
 459     case 0x06:
 460     case 0x07:
 461     case 0xC0:
 462     case 0xC2:
 463     case 0xC4:
 464     case 0xC6:
 465     case 0xC8:
 466     case 0xCA:
 467     case 0xCC:
 468     case 0xCE:
 469     case 0x87:
 470     case 0x83:
 471     case 0x81:
 472     case 0x82:
 473     case 0x8B:
 474     case 0x89:
 475     case 0x8A:
 476     case 0x487:
 477     case 0x483:
 478     case 0x481:
 479     case 0x482:
 480     case 0x48B:
 481     case 0x489:
 482     case 0x48A:
 483     case 0x08:
 484     case 0xD0:
 485     case 0x0D:
 486     case 0xDA:
 487         res = (DWORD)DMA_ioport_in( port );
 488         break;
 489     default:
 490         WARN("Direct I/O read attempted from port %x\n", port);
 491         break;
 492     }
 493     return res;
 494 }
 495
 496
 497 /**********************************************************************
 498  *          outport  (WINEDOS.@)
 499  */
 500 void WINAPI DOSVM_outport( int port, int size, DWORD value )
 501 {
 502     TRACE("IO: 0x%lx (%d-byte value) to port 0x%04x\n", value, size, port );
 503
 504 #ifdef HAVE_PPDEV
 505     if (do_pp_port_access == -1) do_pp_port_access = IO_pp_init();
 506     if ((do_pp_port_access == 0) && (size == 1))
 507     {
 508         if (!IO_pp_outp(port,&value)) return;
 509     }
 510 #endif
 511
 512 #ifdef DIRECT_IO_ACCESS
 513
 514     if (do_direct_port_access == -1) IO_port_init();
 515     if ((do_direct_port_access)
 516         /* Make sure we have access to the port */
 517         && (port_permissions[port] & IO_WRITE))
 518     {
 519         iopl(3);
 520         switch(size)
 521         {
 522         case 1: outb( LOBYTE(value), port ); break;
 523         case 2: outw( LOWORD(value), port ); break;
 524         case 4: outl( value, port ); break;
 525         }
 526         iopl(0);
 527         return;
 528     }
 529 #endif
 530
 531     switch (port)
 532     {
 533     case 0x20:
 534         DOSVM_PIC_ioport_out( port, (BYTE)value );
 535         break;
 536     case 0x40:
 537     case 0x41:
 538     case 0x42:
 539         {
 540             BYTE chan = port & 3;
 541
 542             /* we need to get the oldval before any lo/hi byte change has been made */
 543             if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 544                 !tmr_8253[chan].byte_toggle)
 545                 tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 546             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 547             {
 548             case 0:
 549                 break; /* shouldn't happen? */
 550             case 1: /* write lo byte */
 551                 tmr_8253[chan].countmax =
 552                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 553                 break;
 554             case 3: /* write lo byte, then hi byte */
 555                 tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 556                 if (tmr_8253[chan].byte_toggle)
 557                 {
 558                     tmr_8253[chan].countmax =
 559                         (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 560                     break;
 561                 }
 562                 /* else [fall through if write hi byte !] */
 563             case 2: /* write hi byte */
 564                 tmr_8253[chan].countmax =
 565                     (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 566                 break;
 567             }
 568             /* if programming is finished and value has changed
 569                then update to new value */
 570             if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 571                  !tmr_8253[chan].byte_toggle) &&
 572                 (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 573                 set_timer_maxval(chan, tmr_8253[chan].countmax);
 574         }
 575         break;
 576     case 0x43:
 577        {
 578            BYTE chan = ((BYTE)value & 0xc0) >> 6;
 579            /* ctrl byte for specific timer channel */
 580            if (chan == 3)
 581            {
 582                FIXME("8254 timer readback not implemented yet\n");
 583                break;
 584            }
 585            switch (((BYTE)value & 0x30) >> 4)
 586            {
 587            case 0:      /* latch timer */
 588                tmr_8253[chan].latched = TRUE;
 589                dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 590                if (chan == 0) /* System timer divisor */
 591                    tmr_8253[chan].latch = dummy_ctr + (WORD)DOSVM_GetTimer();
 592                else
 593                {
 594                    /* FIXME: intelligent hardware timer emulation needed */
 595                    tmr_8253[chan].latch = dummy_ctr;
 596                }
 597                break;
 598            case 3:      /* write lo byte, then hi byte */
 599                tmr_8253[chan].byte_toggle = FALSE; /* init */
 600                /* fall through */
 601            case 1:      /* write lo byte only */
 602            case 2:      /* write hi byte only */
 603                tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 604                break;
 605            }
 606        }
 607        break;
 608     case 0x61:
 609         parport_8255[1] = (BYTE)value;
 610         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 611         {
 612             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 613             Beep(1193180 / tmr_8253[2].countmax, 20);
 614         }
 615         break;
 616     case 0x70:
 617         cmosaddress = (BYTE)value & 0x7f;
 618         break;
 619     case 0x71:
 620         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 621         break;
 622     case 0x226:
 623     case 0x22c:
 624         SB_ioport_out( port, (BYTE)value );
 625         break;
 626     case 0x3c0:
 627     case 0x3c1:
 628     case 0x3c2:
 629     case 0x3c3:
 630     case 0x3c4:
 631     case 0x3c5:
 632     case 0x3c6:
 633     case 0x3c7:
 634     case 0x3c8:
 635     case 0x3c9:
 636     case 0x3ca:
 637     case 0x3cb:
 638     case 0x3cc:
 639     case 0x3cd:
 640     case 0x3ce:
 641     case 0x3cf:
 642     case 0x3d0:
 643     case 0x3d1:
 644     case 0x3d2:
 645     case 0x3d3:
 646     case 0x3d4:
 647     case 0x3d5:
 648     case 0x3d6:
 649     case 0x3d7:
 650     case 0x3d8:
 651     case 0x3d9:
 652     case 0x3da:
 653     case 0x3db:
 654     case 0x3dc:
 655     case 0x3dd:
 656     case 0x3de:
 657     case 0x3df:
 658         VGA_ioport_out( port, LOBYTE(value) );
 659         if(size > 1) {
 660             VGA_ioport_out( port+1, HIBYTE(value) );
 661             if(size > 2) {
 662                 VGA_ioport_out( port+2, LOBYTE(HIWORD(value)) );
 663                 VGA_ioport_out( port+3, HIBYTE(HIWORD(value)) );
 664             }
 665         }
 666         break;
 667     case 0x00:
 668     case 0x01:
 669     case 0x02:
 670     case 0x03:
 671     case 0x04:
 672     case 0x05:
 673     case 0x06:
 674     case 0x07:
 675     case 0xC0:
 676     case 0xC2:
 677     case 0xC4:
 678     case 0xC6:
 679     case 0xC8:
 680     case 0xCA:
 681     case 0xCC:
 682     case 0xCE:
 683     case 0x87:
 684     case 0x83:
 685     case 0x81:
 686     case 0x82:
 687     case 0x8B:
 688     case 0x89:
 689     case 0x8A:
 690     case 0x487:
 691     case 0x483:
 692     case 0x481:
 693     case 0x482:
 694     case 0x48B:
 695     case 0x489:
 696     case 0x48A:
 697     case 0x08:
 698     case 0xD0:
 699     case 0x0B:
 700     case 0xD6:
 701     case 0x0A:
 702     case 0xD4:
 703     case 0x0F:
 704     case 0xDE:
 705     case 0x09:
 706     case 0xD2:
 707     case 0x0C:
 708     case 0xD8:
 709     case 0x0D:
 710     case 0xDA:
 711     case 0x0E:
 712     case 0xDC:
 713         DMA_ioport_out( port, (BYTE)value );
 714         break;
 715     default:
 716         WARN("Direct I/O write attempted to port %x\n", port );
 717         break;
 718     }
 719 }