| /* |
| * 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. |
| * |
| * You can also choose to distribute this program under the terms of |
| * the Unmodified Binary Distribution Licence (as given in the file |
| * COPYING.UBDL), provided that you have satisfied its requirements. |
| */ |
| |
| FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); |
| |
| /** |
| * @file |
| * |
| * Advanced Power Management |
| * |
| */ |
| |
| #include <errno.h> |
| #include <realmode.h> |
| #include <ipxe/apm.h> |
| |
| /** |
| * Power off the computer using APM |
| * |
| * @ret rc Return status code |
| */ |
| 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; |
| } |
