113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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* Copyright (C) 2013 Marin Hannache <ipxe@mareo.fr>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/**
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* @file
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*
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* Advanced Power Management
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*
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*/
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#include <errno.h>
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#include <realmode.h>
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#include <ipxe/reboot.h>
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/**
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* Power off the computer using APM
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*
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* @ret rc Return status code
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*/
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static int apm_poweroff ( void ) {
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uint16_t apm_version;
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uint16_t apm_signature;
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uint16_t apm_flags;
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uint16_t carry;
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/* APM check */
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__asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
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"adc %%edx,0\n\t" )
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: "=a" ( apm_version ), "=b" ( apm_signature ),
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"=c" ( apm_flags ), "=d" ( carry )
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: "a" ( 0x5300 ), "b" ( 0x0000 ),
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"d" ( 0x0000 ) );
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if ( carry ) {
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DBG ( "APM not present\n" );
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return -ENOTSUP;
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}
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if ( apm_signature != 0x504d ) { /* signature 'PM' */
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DBG ( "APM not present\n" );
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return -ENOTSUP;
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}
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if ( apm_version < 0x0101 ) { /* Need version 1.1+ */
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DBG ( "APM 1.1+ not supported\n" );
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return -ENOTSUP;
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}
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if ( ( apm_flags & 0x8 ) == 0x8 ) {
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DBG ( "APM power management disabled\n" );
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return -EPERM;
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}
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DBG2 ( "APM check completed\n" );
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/* APM initialisation */
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__asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
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"adc %%edx,0\n\t" )
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: "=d" ( carry )
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: "a" ( 0x5301 ), "b" ( 0x0000 ),
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"d" ( 0x0000 ) );
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if ( carry ) {
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DBG ( "APM initialisation failed\n" );
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return -EIO;
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}
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DBG2 ( "APM initialisation completed\n" );
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/* Set APM driver version */
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__asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
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"adc %%edx,0\n\t" )
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: "=d" ( carry )
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: "a" ( 0x530e ), "b" ( 0x0000 ),
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"c" ( 0x0101 ), "d" ( 0x0000 ) );
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if ( carry ) {
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DBG ( "APM setting driver version failed\n" );
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return -EIO;
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}
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DBG2 ( "APM driver version set\n" );
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/* Setting power state to off */
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__asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
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"adc %%edx,0\n\t" )
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: "=d" ( carry )
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: "a" ( 0x5307 ), "b" ( 0x0001 ),
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"c" ( 0x0003 ), "d" ( 0x0000) );
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if ( carry ) {
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DBG ( "APM setting power state failed\n" );
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return -ENOTTY;
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}
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/* Should never happen */
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return -ECANCELED;
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}
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PROVIDE_REBOOT ( pcbios, poweroff, apm_poweroff );
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