示例#1
0
文件： vga.c 项目： LarBob/executor 
boolean_t
vgahost_init (int max_width, int max_height, int max_bpp, boolean_t fixed_p,
	      int *argc, char *argv[])
{
  int sel;

  /* Grab a 64K selector for 0xA000:0000, for the frame buffer. */
  sel = __dpmi_segment_to_descriptor (0xA000);
  if (sel == -1)
    return FALSE;
  vga_window_selector = sel;
  vga_screen_selector = -1;  /* no value yet. */

  vesa_version = compute_vesa_version ();

#if defined (SAVE_VGA_STATE)

#if !defined (USE_VESA_STATE_SAVE)
  state_glue_funcp = vga_state_glue;
#else /* USE_VESA_STATE_SAVE */
#error "this will break with the mods to try switching to fullscreen and querying VESA version again...we might save the wrong kind of state!"
  if (vesa_version >= 0x100)  /* version 1.0 or greater? */
    state_glue_funcp = vesa_state_glue;
  else
    state_glue_funcp = vga_state_glue;
#endif /* USE_VESA_STATE_SAVE */

#endif

  /* Save the current VGA state, so we can clean up well when we exit. */
  save_vga_state ();

  /* WinNT appears to not show us a VESA driver unless we start in
   * full screen mode.  However, if we set a plain VGA graphics mode
   * it switches us to full screen mode.  If we didn't see a VESA
   * driver, this attempts to switch to fullscreen mode and then try
   * again.
   */
  if (vesa_version == 0 && !only_use_vga_p)
    {
      __dpmi_regs regs;

      dpmi_zero_regs (&regs);
      regs.x.ax = 0x12;  /* 640x480 VGA mode.  AH == 0x00.  Erase screen. */
      if (__dpmi_int (0x10, &regs) == 0)
	{
	  vesa_version = compute_vesa_version ();
	  restore_vga_state ();
	}
    }

  return TRUE;
}
示例#2
0
int display_dos_init()
{
    __dpmi_regs r;
    /* Set char-smashed-together mode */
    r.x.ax = 0x1201;
    r.h.bl = 0x30;
    __dpmi_int(0x10, &r);
    r.x.ax = 0x0003;
    __dpmi_int(0x10, &r);

    /* Pointer to video memory */
    videomem = __dpmi_segment_to_descriptor(0xb800);
    /* Block cursor */
    _setcursortype(_SOLIDCURSOR);

    /* No windows by default */
    windows = 0;

    /* Check for Win95/Win98 */
    if (getenv("winbootdir") != NULL)
        windows = 1;
    /* Check for WinNT/Win2k */
    if ((getenv("OS") != NULL) && !strcmp(getenv("OS"), "Windows_NT"))
        windows = 2;

    lshift = rshift = 0;

    /* Save the old handler */
    _go32_dpmi_get_protected_mode_interrupt_vector(KBD_INT, &old_kb_handler);

    /* Create new handler, chain it to old */
    new_kb_handler.pm_offset = (int) kb_isr;
    new_kb_handler.pm_selector = _go32_my_cs();
    _go32_dpmi_chain_protected_mode_interrupt_vector(KBD_INT, &new_kb_handler);

    /* flush the keystroke buffer just in case */
    while (kbhit()) display_dos_getch();

    return -1;
}