com32/cmenu/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) && (REG_EDX(outreg) == 0x58550000);
  27 }
  28
  29 void runsyslinuxcmd(const char *cmd)
  30 {
  31     strcpy(__com32.cs_bounce, cmd);
  32     REG_AX(inreg) = 0x0003;     // Run command
  33     REG_BX(inreg) = OFFS(__com32.cs_bounce);
  34     REG_ES(inreg) = SEG(__com32.cs_bounce);
  35     __intcall(0x22, &inreg, &outreg);
  36 }
  37
  38 void gototxtmode(void)
  39 {
  40     REG_AX(inreg) = 0x0005;
  41     __intcall(0x22, &inreg, &outreg);
  42 }
  43
  44 void syslinux_idle(void)
  45 {
  46     REG_AX(inreg) = 0x0013;
  47     __intcall(0x22, &inreg, &outreg);
  48 }
  49
  50 unsigned int getversion(char *deriv, unsigned int *numfun)
  51 {
  52     REG_AX(inreg) = 0x0001;
  53     __intcall(0x22, &inreg, &outreg);
  54     if (deriv)
  55         *deriv = REG_DL(outreg);
  56     if (numfun)
  57         *numfun = REG_AX(outreg);
  58     return REG_CX(outreg);
  59 }
  60
  61 void runsyslinuximage(const char *cmd, long ipappend)
  62 {
  63     unsigned int numfun = 0;
  64     char *ptr, *cmdline;
  65
  66     (void)ipappend;             // XXX: Unused?!
  67
  68     getversion(NULL, &numfun);
  69     // Function 16h not supported Fall back to runcommand
  70     if (numfun < 0x16)
  71         runsyslinuxcmd(cmd);
  72     // Try the Run Kernel Image function
  73     // Split command line into
  74     strcpy(__com32.cs_bounce, cmd);
  75     ptr = __com32.cs_bounce;
  76     // serach for first space or end of string
  77     while ((*ptr) && (*ptr != ' '))
  78         ptr++;
  79     if (!*ptr)
  80         cmdline = ptr;          // no command line
  81     else {
  82         *ptr++ = '\0';          // terminate kernal name
  83         cmdline = ptr + 1;
  84         while (*cmdline != ' ')
  85             cmdline++;          // find first non-space
  86     }
  87     // Now call the interrupt
  88     REG_BX(inreg) = OFFS(cmdline);
  89     REG_ES(inreg) = SEG(cmdline);
  90     REG_SI(inreg) = OFFS(__com32.cs_bounce);
  91     REG_DS(inreg) = SEG(__com32.cs_bounce);
  92     REG_EDX(inreg) = 0;
  93
  94     __intcall(0x22, &inreg, &outreg);   // If successful does not return
  95 }