menu/libmenu/syslnx.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 "syslnx.h"
  16
  17 com32sys_t inreg,outreg; // Global registers for this module
  18
  19 char issyslinux(void)
  20 {
  21   REG_EAX(inreg) = 0x00003000;
  22   REG_EBX(inreg) = REG_ECX(inreg) = REG_EDX(inreg) = 0xFFFFFFFF;
  23   __intcall(0x21,&inreg,&outreg);
  24   return (REG_EAX(outreg) == 0x59530000) &&
  25          (REG_EBX(outreg) == 0x4c530000) &&
  26          (REG_ECX(outreg) == 0x4e490000) &&
  27          (REG_EDX(outreg) == 0x58550000);
  28 }
  29
  30 void runsyslinuxcmd(const char *cmd)
  31 {
  32   strcpy(__com32.cs_bounce, cmd);
  33   REG_AX(inreg) = 0x0003; // Run command
  34   REG_BX(inreg) = OFFS(__com32.cs_bounce);
  35   REG_ES(inreg) = SEG(__com32.cs_bounce);
  36   __intcall(0x22, &inreg, &outreg);
  37 }
  38
  39 void gototxtmode(void)
  40 {
  41   REG_AX(inreg) = 0x0005;
  42   __intcall(0x22,&inreg,&outreg);
  43 }
  44
  45 void syslinux_idle(void)
  46 {
  47   REG_AX(inreg) = 0x0013;
  48   __intcall(0x22,&inreg,&outreg);
  49 }
  50
  51 unsigned int getversion(char *deriv,unsigned int *numfun)
  52 {
  53   REG_AX(inreg) = 0x0001;
  54   __intcall(0x22,&inreg,&outreg);
  55   if (deriv) *deriv= REG_DL(outreg);
  56   if (numfun) *numfun = REG_AX(outreg);
  57   return REG_CX(outreg);
  58 }
  59
  60 void runsyslinuximage(const char*cmd, long ipappend)
  61 {
  62   unsigned int numfun = 0;
  63   char *ptr,*cmdline;
  64
  65   getversion(NULL,&numfun);
  66   // Function 16h not supported Fall back to runcommand
  67   if (numfun < 0x16) runsyslinuxcmd(cmd);
  68   // Try the Run Kernel Image function
  69   // Split command line into
  70   strcpy(__com32.cs_bounce,cmd);
  71   ptr = __com32.cs_bounce;
  72   // serach for first space or end of string
  73   while ( (*ptr) && (*ptr != ' ')) ptr++;
  74   if (!*ptr) cmdline = ptr; // no command line
  75   else {
  76      *ptr++='\0'; // terminate kernal name
  77      cmdline = ptr+1;
  78      while (*cmdline != ' ') cmdline++; // find first non-space
  79   }
  80   // Now call the interrupt
  81   REG_BX(inreg) = OFFS(cmdline);
  82   REG_ES(inreg) = SEG(cmdline);
  83   REG_SI(inreg) = OFFS(__com32.cs_bounce);
  84   REG_DS(inreg) = SEG(__com32.cs_bounce);
  85   REG_EDX(inreg) = 0;
  86
  87   __intcall(0x22,&inreg,&outreg); // If successful does not return
  88 }