com32/modules/poweroff.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2013 Sebastian Herbszt - 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., 51 Franklin St, Fifth Floor,
   8  *   Boston MA 02110-1301, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * poweroff.c
  15  *
  16  * APM poweroff module
  17  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <com32.h>
  22
  23 int main()
  24 {
  25         com32sys_t inregs, outregs;
  26
  27         memset(&inregs, 0, sizeof inregs);
  28
  29         inregs.eax.l = 0x5300; /* APM Installation Check (00h) */
  30         inregs.ebx.l = 0; /* APM BIOS (0000h) */
  31         __intcall(0x15, &inregs, &outregs);
  32
  33         if (outregs.eflags.l & EFLAGS_CF) {
  34                 printf("APM not present.\n");
  35                 return 1;
  36         }
  37
  38         if ((outregs.ebx.l & 0xffff) != 0x504d) { /* signature 'PM' */
  39                 printf("APM not present.\n");
  40                 return 1;
  41         }
  42
  43         if ((outregs.eax.l & 0xffff) < 0x101) { /* Need version 1.1+ */
  44                 printf("APM 1.1+ not supported.\n");
  45                 return 1;
  46         }
  47
  48         if ((outregs.ecx.l & 0x8) == 0x8) { /* bit 3 APM BIOS Power Management disabled */
  49                 printf("Power management disabled.\n");
  50                 return 1;
  51         }
  52
  53         inregs.eax.l = 0x5301; /* APM Real Mode Interface Connect (01h) */
  54         inregs.ebx.l = 0; /* APM BIOS (0000h) */
  55         __intcall(0x15, &inregs, &outregs);
  56
  57         if (outregs.eflags.l & EFLAGS_CF) {
  58                 printf("APM RM interface connect failed.\n");
  59                 return 1;
  60         }
  61
  62         inregs.eax.l = 0x530e; /* APM Driver Version (0Eh) */
  63         inregs.ebx.l = 0; /* APM BIOS (0000h) */
  64         inregs.ecx.l = 0x101; /* APM Driver version 1.1 */
  65         __intcall(0x15, &inregs, &outregs);
  66
  67         if (outregs.eflags.l & EFLAGS_CF) {
  68                 printf("APM 1.1+ not supported.\n");
  69                 return 1;
  70         }
  71
  72         if ((outregs.ecx.l & 0xffff) < 0x101) { /* APM Connection version */
  73                 printf("APM 1.1+ not supported.\n");
  74                 return 1;
  75         }
  76
  77         inregs.eax.l = 0x5307; /* Set Power State (07h) */
  78         inregs.ebx.l = 1; /* All devices power managed by the APM BIOS */
  79         inregs.ecx.l = 3; /* Power state off */
  80         __intcall(0x15, &inregs, &outregs);
  81
  82         if (outregs.eflags.l & EFLAGS_CF) {
  83                 printf("Power off failed.\n");
  84                 return 1;
  85         }
  86
  87         return 0;
  88 }