mbr/adjust.h

   1 /* -*- asm -*- -----------------------------------------------------------
   2  *
   3  *   Copyright 2009-2014 Intel Corporation; author: H. Peter Anvin
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 /*
  29  * adjust.h
  30  *
  31  * Macros to adjust the drive number
  32  */
  33
  34 #ifndef ADJUST_H
  35 #define ADJUST_H
  36
  37 #ifdef CTRL_80
  38         .macro ADJUST_DRIVE
  39         pusha
  40         movb    $0x02, %ah
  41         int     $0x16
  42         testb   $0x04, %al
  43         popa
  44         jz      1f
  45         movb    $0x80, %dl
  46 1:
  47         .endm
  48 #elif defined(FORCE_80)
  49         .macro ADJUST_DRIVE
  50         movb    $0x80, %dl
  51         .endm
  52 #else
  53         .macro ADJUST_DRIVE
  54         .endm
  55 #endif
  56
  57 #endif /* ADJUST_H */