ru.unix.bsd

 
 - RU.UNIX.BSD ------------------------------------------------------------------
 From : Valentin Davydov                     2:5020/400     03 Mar 2001  19:56:14
 To : All
 Subject : Re: /dev/io
 -------------------------------------------------------------------------------- 
 

 >   From: Anton Baranov <Anton.Baranov@p112.f112.n5000.z2.fidonet.org>
 >   Date: Fri, 02 Mar 2001 23:16:12 +0300
 >
 >Столкнyлся с пpоблемой пpямого пpогpаммиpования поpтов вода-вывода в FreeBSD.
 >Почитав этy эхy нашел что юто делается чеpе /dev/io, но ни написааное в эхе, ни
 >написанное в man, ничего pезyльтатов непpинесло. Максимyм сего добился, так это
 >чтобы пpогpамма не выпадала в коpy.
 >
 >Покажите на конкpетном пpимеpе как это делается. Hе дайте погибнyть.
 
 Вот что у меня сейчас работает на лаптопе:
 
 /*  T P D U A L S C A N . C
 
     Author: Michael Steiner
             <steiner@acm.org> <sti@zurich.ibm.com>
             http://www.zurich.ibm.com/pub/sti/www/info.html
     Ported to FreeBSD: Valentin Davydov
   <val@sqdp.trc-net.co.jp>
 
    This program allows you to set videoram for IBM ThinkPads with dualscan
    LCD screen (at least for the 750Cs and 5538-VWD but probably also for 
    others) to allow running XFree86 without patching it (normally you got 
    all twice if the upper 512K of videoram are not disabled).
 
    Usage:
    a) you run on the built-in monitor:
       (1) run 'tpdualscan -d' as root
       (2) start X (e.g with startx)
    b) you run on an external monitor:
       (1) run 'tpdualscan -e' as root
       (2) start X (e.g with startx)
  */
 
 #define PROGNAME "tpdualscan"
 
 #include <stdio.h>
 #include <unistd.h>
 #include <errno.h>
 #include <machine/cpufunc.h>
 #include <fcntl.h>
 
 char usage[] =  "usage: "PROGNAME"(-d(isable) | -e(nable) | -s(tatus))";
 
 void main (int argc, char *argv[]) {
     unsigned long                       vgaIOBase;
     int                                 colorEmulation, dualScan, devIOHandle;
     enum {enable, disable, status}      mode = status;
     unsigned char                       registr;
 
     /* parse command line */
     if ((argc > 2) || ((argc == 2) && (argv[1][0] != '-'))){
         fprintf(stderr, "%s\n", usage); exit(1);
     }
     if (argc == 2) {
         switch (argv[1][1]) {
         case 'h':
             printf("%s\ndisable/enable upper 512K of VRAM for dual-scan
 thinkpads\n", usage); exit(0);
         case 'd':               /* disable */
             mode = disable; break;
         case 'e':               /* enable */
             mode = enable; break;
         case 's':               /* status */
             mode = status; break;
         default:
             fprintf(stderr, "invalid option %c\n%s\n", argv[1][1], usage);
 exit(1);
         }
     }
 
     /* enable direct ports I/O */
 
     devIOHandle = open("/dev/io", O_RDONLY);
     if (devIOHandle == -1){
   fprintf(stderr, "%s: Can not get IO permission (%s)",
       PROGNAME, strerror(errno)); 
   exit(1);};
 
     /* set vga IO base depend from color mode */
     colorEmulation = inb(0x3CC) & 0x01;
     if (!colorEmulation) {
         fprintf(stderr, "you are not running a dual scan thinkpad \n");
         exit(1);
     }
     vgaIOBase = (colorEmulation) ? 0x3D0 : 0x3B0;
 
     /* unlock flat panel registers PR18, PR19, PR!a, PR36-PR41 and PR44 */
     outb(vgaIOBase + 4, 0x34);  /* PR1B */
     registr = inb(vgaIOBase + 5); 
     outb(vgaIOBase + 5, ((registr & 0x1F) | 0xA0)); /* set bits 5-7 to 101 */
     
     /* check if we have a dual-scan LCD */
     outb(vgaIOBase + 4, 0x31);
     dualScan = ((inb(vgaIOBase + 5) & 0xB) == 0); /* dual scan == 
 (PR18[bit:3,1,0] = 0)  */
     if (!dualScan) {
         fprintf(stderr, "you are not running a dual scan thinkpad \n");
         exit(1);
     }
 
     /*  clear bit 6 to disable upper 512k The remaining 512Kbytes
         of video memory are not disabled by clearing the bit, but it
         is actually used as a shadow of first 512Kbyte */
     outb(0x3CE, 0x0B);
     registr = inb(0x3CF);       /* PR1 */
         
     if (mode == disable) {
         printf("setting vramsize to 512K\n");
         outb(0x3CE, 0x0B); outb(0x3CF, registr & 0xBF); /* enable 512 */
     } else if (mode == enable) {
         printf("setting vramsize to 1024K\n");
         outb(0x3CE, 0x0B); outb(0x3CF, registr | 0xC0); /* enable 1024 */
     } else {
         printf("current vramsize is %dK\n", ( (registr & 0x40) ? 1024 : 512));
     }
 
     /* cleanup */
     /* lock flat panel registers PR18, PR19, PR!a, PR36-PR41 and PR44 */
     outb(vgaIOBase + 4, 0x34);  /* PR1B */
     registr = inb(vgaIOBase + 5); 
     outb(vgaIOBase + 5, (registr & 0x1F)); /* set bits 5-7 to other than 101 */
     
     /* disable direct ports I/O */
     close(devIOHandle);
 }
 
 --- ifmail v.2.15dev5
  * Origin: Demos online service (2:5020/400)
 
 

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Тема:    Автор:    Дата:    /dev/io   Anton Baranov   03 Mar 2001 00:16:12   Re: /dev/io   Valentin Davydov   03 Mar 2001 19:56:14