modules/poweroff.asm

   1 ; ****************************************************************************
   2 ;
   3 ;  poweroff.asm
   4 ;
   5 ;   Copyright 2009 Sebastian Herbszt
   6 ;
   7 ;  APM poweroff module.
   8 ;
   9 ;  This program is free software; you can redistribute it and/or modify
  10 ;  it under the terms of the GNU General Public License as published by
  11 ;  the Free Software Foundation, Inc., 53 Temple Place Ste 330,
  12 ;  Boston MA 02111-1307, USA; either version 2 of the License, or
  13 ;  (at your option) any later version; incorporated herein by reference.
  14 ;
  15 ; ****************************************************************************
  16
  17                 absolute 0
  18 pspInt20:       resw 1
  19 pspNextP:       resw 1
  20                 resb 124
  21 pspCmdLen:      resb 1
  22 pspCmdArg:      resb 127
  23
  24                 section .text
  25                 org     0x100
  26
  27 _start:
  28                 mov ax,5300h    ; APM Installation Check (00h)
  29                 xor bx,bx       ; APM BIOS (0000h)
  30                 int 15h
  31                 jnc check_sig
  32
  33                 mov bx, msg_notpresent
  34                 jmp error
  35
  36 check_sig:
  37                 cmp bx,504Dh    ; signature 'PM'
  38                 je check_ver
  39
  40                 mov bx, msg_notpresent
  41                 jmp error
  42
  43 check_ver:
  44                 cmp ax,0101h    ; Need version 1.1+
  45                 jae check_state
  46
  47                 mov bx, msg_notsup
  48                 jmp error
  49
  50 check_state:
  51                 test cx,8       ; bit 3 APM BIOS Power Management disabled
  52                 jz connect
  53
  54                 mov bx, msg_pmdisabled
  55                 jmp error
  56
  57 connect:
  58                 mov ax,5301h    ; APM Real Mode Interface Connect (01h)
  59                 xor bx,bx       ; APM BIOS (0000h)
  60                 int 15h
  61                 jnc connect_ok
  62
  63                 mov bx, msg_connect
  64                 jmp error
  65
  66 connect_ok:
  67                 mov ax,530Eh    ; APM Driver Version (0Eh)
  68                 xor bx,bx       ; APM BIOS (0000h)
  69                 mov cx,0101h    ; APM Driver version 1.1
  70                 int 15h
  71                 jnc apm0101_check
  72
  73                 mov bx, msg_notsup
  74                 jmp error
  75
  76 apm0101_check:
  77                 cmp cx,0101h    ; APM Connection version
  78                 jae apm0101_ok
  79
  80                 mov bx, msg_notsup
  81                 jmp error
  82
  83 apm0101_ok:
  84                 mov ax,5307h    ; Set Power State (07h)
  85                 mov bx,0001h    ; All devices power managed by the APM BIOS
  86                 mov cx,0003h    ; Power state off
  87                 int 15h
  88                 jnc off
  89
  90                 mov bx, msg_failed
  91
  92 error:
  93                 mov ax,2
  94                 int 22h
  95 off:
  96                 ret
  97
  98 msg_notpresent: db 'APM not present.',0dh,0ah,0
  99 msg_notsup:     db 'APM 1.1+ not supported.',0dh,0ah,0
 100 msg_pmdisabled: db 'Power management disabled.',0dh,0ah,0
 101 msg_connect:    db 'APM RM interface connect failed.',0dh,0ah,0
 102 msg_failed:     db 'Power off failed.',0dh,0ah,0