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/* -*- c -*- ------------------------------------------------------------- *
 *
 *   Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
 *   Boston MA 02111-1307, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

#include <string.h>
#include <com32.h>
#include "syslnx.h"

com32sys_t inreg,outreg; // Global registers for this module

char issyslinux(void)
{
  REG_EAX(inreg) = 0x00003000;
  REG_EBX(inreg) = REG_ECX(inreg) = REG_EDX(inreg) = 0xFFFFFFFF;
  __intcall(0x21,&inreg,&outreg);
  return (REG_EAX(outreg) == 0x59530000) &&
         (REG_EBX(outreg) == 0x4c530000) &&
         (REG_ECX(outreg) == 0x4e490000) &&
         (REG_EDX(outreg) == 0x58550000);
}

void runsyslinuxcmd(const char *cmd)
{
  strcpy(__com32.cs_bounce, cmd);
  REG_AX(inreg) = 0x0003; // Run command
  REG_BX(inreg) = OFFS(__com32.cs_bounce);
  REG_ES(inreg) = SEG(__com32.cs_bounce);
  __intcall(0x22, &inreg, &outreg);
}

void gototxtmode(void)
{
  REG_AX(inreg) = 0x0005;
  __intcall(0x22,&inreg,&outreg);
}

void syslinux_idle(void)
{
  REG_AX(inreg) = 0x0013;
  __intcall(0x22,&inreg,&outreg);
}

unsigned int getversion(char *deriv,unsigned int *numfun)
{
  REG_AX(inreg) = 0x0001;
  __intcall(0x22,&inreg,&outreg);
  if (deriv) *deriv= REG_DL(outreg);
  if (numfun) *numfun = REG_AX(outreg);
  return REG_CX(outreg);
}

void runsyslinuximage(const char*cmd, long ipappend)
{
  unsigned int numfun = 0;
  char *ptr,*cmdline;

  getversion(NULL,&numfun);
  // Function 16h not supported Fall back to runcommand
  if (numfun < 0x16) runsyslinuxcmd(cmd);
  // Try the Run Kernel Image function
  // Split command line into
  strcpy(__com32.cs_bounce,cmd);
  ptr = __com32.cs_bounce;
  // serach for first space or end of string
  while ( (*ptr) && (*ptr != ' ')) ptr++;
  if (!*ptr) cmdline = ptr; // no command line
  else {
     *ptr++='\0'; // terminate kernal name
     cmdline = ptr+1;
     while (*cmdline != ' ') cmdline++; // find first non-space
  }
  // Now call the interrupt
  REG_BX(inreg) = OFFS(cmdline);
  REG_ES(inreg) = SEG(cmdline);
  REG_SI(inreg) = OFFS(__com32.cs_bounce);
  REG_DS(inreg) = SEG(__com32.cs_bounce);
  REG_EDX(inreg) = 0;

  __intcall(0x22,&inreg,&outreg); // If successful does not return
}