menu/libmenu/com32io.c

   1 /* -*- c -*- ------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 #include <string.h>
  14 #include <com32.h>
  15 #include "com32io.h"
  16 #include "syslnx.h"
  17
  18 com32sys_t inreg,outreg; // Global register sets for use
  19
  20 /* Print character and attribute at cursor */
  21 void cprint(char chr,char attr,unsigned int times,char disppage)
  22 {
  23     REG_AH(inreg) = 0x09;
  24     REG_AL(inreg) = chr;
  25     REG_BH(inreg) = disppage;
  26     REG_BL(inreg) = attr;
  27     REG_CX(inreg) = times;
  28     __intcall(0x10,&inreg,&outreg);
  29 }
  30
  31 void setdisppage(char num) // Set the display page to specified number
  32 {
  33     REG_AH(inreg) = 0x05;
  34     REG_AL(inreg) = num;
  35     __intcall(0x10,&inreg,&outreg);
  36 }
  37
  38 char getdisppage() // Get current display page
  39 {
  40     REG_AH(inreg) = 0x0f;
  41     __intcall(0x10,&inreg,&outreg);
  42     return REG_BH(outreg);
  43 }
  44
  45 void getpos(char * row, char * col, char page)
  46 {
  47    REG_AH(inreg) = 0x03;
  48    REG_BH(inreg) = page;
  49    __intcall(0x10,&inreg,&outreg);
  50    *row = REG_DH(outreg);
  51    *col = REG_DL(outreg);
  52 }
  53
  54 void gotoxy(char row,char col, char page)
  55 {
  56    REG_AH(inreg) = 0x02;
  57    REG_BH(inreg) = page;
  58    REG_DX(inreg) = (row << 8)+col;
  59    __intcall(0x10,&inreg,&outreg);
  60 }
  61
  62 unsigned char sleep(unsigned int msec)
  63 {
  64    unsigned long micro = 1000*msec;
  65
  66    REG_AH(inreg) = 0x86;
  67    REG_CX(inreg) = (micro >> 16);
  68    REG_DX(inreg) = (micro & 0xFFFF);
  69    __intcall(0x15,&inreg,&outreg);
  70    return REG_AH(outreg);
  71 }
  72
  73 void beep()
  74 {
  75    REG_AH(inreg) = 0x0E;
  76    REG_AL(inreg) = 0x07;
  77    REG_BH(inreg) = 0;
  78    __intcall(0x10,&inreg,&outreg);
  79 }
  80
  81 void scrollupwindow(char top, char left, char bot, char right, char attr,char numlines)
  82 {
  83   REG_AH(inreg) = 0x06;
  84   REG_AL(inreg) = numlines;
  85   REG_BH(inreg) = attr; // Attribute to write blanks lines
  86   REG_DX(inreg) = (bot << 8) + right; // BOT RIGHT corner of window
  87   REG_CX(inreg) = (top << 8) + left; // TOP LEFT of window
  88   __intcall(0x10,&inreg,&outreg);
  89 }
  90
  91 char inputc(char * scancode)
  92 {
  93   syslinux_idle(); /* So syslinux can perform periodic activity */
  94   REG_AH(inreg) = 0x10;
  95   __intcall(0x16,&inreg,&outreg);
  96   if (scancode) *scancode = REG_AH(outreg);
  97   return REG_AL(outreg);
  98 }
  99
 100 void getcursorshape(char *start, char *end)
 101 {
 102    char page = getdisppage();
 103    REG_AH(inreg) = 0x03;
 104    REG_BH(inreg) = page;
 105    __intcall(0x10,&inreg,&outreg);
 106    *start = REG_CH(outreg);
 107    *end = REG_CL(outreg);
 108 }
 109
 110 void setcursorshape(char start, char end)
 111 {
 112    REG_AH(inreg) = 0x01;
 113    REG_CH(inreg) = start;
 114    REG_CL(inreg) = end;
 115    __intcall(0x10,&inreg,&outreg);
 116 }
 117
 118 char getchar(void)
 119 {
 120    REG_AH(inreg) = 0x08;
 121    __intcall(0x21,&inreg,&outreg);
 122    return REG_AL(outreg);
 123 }
 124
 125 void setvideomode(char mode)
 126 {
 127    REG_AH(inreg) = 0x00;
 128    REG_AL(inreg) = mode;
 129    __intcall(0x10,&inreg,&outreg);
 130 }
 131
 132 unsigned char checkkbdbuf()
 133 {
 134    REG_AH(inreg) = 0x11;
 135    __intcall(0x16,&inreg,&outreg);
 136    return !(outreg.eflags.l & EFLAGS_ZF);
 137 }
 138
 139 // Get char displayed at current position
 140 unsigned char getcharat(char page)
 141 {
 142    REG_AH(inreg) = 0x08;
 143    REG_BH(inreg) = page;
 144    __intcall(0x16,&inreg,&outreg);
 145    return REG_AL(outreg);
 146 }