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- /*
- * Copyright (C) 2013 Marin Hannache <ipxe@mareo.fr>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- /**
- * @file
- *
- * Advanced Power Management
- *
- */
-
- #include <errno.h>
- #include <realmode.h>
- #include <ipxe/reboot.h>
-
- /**
- * Power off the computer using APM
- *
- * @ret rc Return status code
- */
- static int apm_poweroff ( void ) {
- uint16_t apm_version;
- uint16_t apm_signature;
- uint16_t apm_flags;
- uint16_t carry;
-
- /* APM check */
- __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
- "adc %%edx,0\n\t" )
- : "=a" ( apm_version ), "=b" ( apm_signature ),
- "=c" ( apm_flags ), "=d" ( carry )
- : "a" ( 0x5300 ), "b" ( 0x0000 ),
- "d" ( 0x0000 ) );
- if ( carry ) {
- DBG ( "APM not present\n" );
- return -ENOTSUP;
- }
- if ( apm_signature != 0x504d ) { /* signature 'PM' */
- DBG ( "APM not present\n" );
- return -ENOTSUP;
- }
- if ( apm_version < 0x0101 ) { /* Need version 1.1+ */
- DBG ( "APM 1.1+ not supported\n" );
- return -ENOTSUP;
- }
- if ( ( apm_flags & 0x8 ) == 0x8 ) {
- DBG ( "APM power management disabled\n" );
- return -EPERM;
- }
- DBG2 ( "APM check completed\n" );
-
- /* APM initialisation */
- __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
- "adc %%edx,0\n\t" )
- : "=d" ( carry )
- : "a" ( 0x5301 ), "b" ( 0x0000 ),
- "d" ( 0x0000 ) );
- if ( carry ) {
- DBG ( "APM initialisation failed\n" );
- return -EIO;
- }
- DBG2 ( "APM initialisation completed\n" );
-
- /* Set APM driver version */
- __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
- "adc %%edx,0\n\t" )
- : "=d" ( carry )
- : "a" ( 0x530e ), "b" ( 0x0000 ),
- "c" ( 0x0101 ), "d" ( 0x0000 ) );
- if ( carry ) {
- DBG ( "APM setting driver version failed\n" );
- return -EIO;
- }
- DBG2 ( "APM driver version set\n" );
-
- /* Setting power state to off */
- __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
- "adc %%edx,0\n\t" )
- : "=d" ( carry )
- : "a" ( 0x5307 ), "b" ( 0x0001 ),
- "c" ( 0x0003 ), "d" ( 0x0000) );
- if ( carry ) {
- DBG ( "APM setting power state failed\n" );
- return -ENOTTY;
- }
-
- /* Should never happen */
- return -ECANCELED;
- }
-
- PROVIDE_REBOOT ( pcbios, poweroff, apm_poweroff );
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