109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
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* Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
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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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#include <unistd.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/io.h>
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#include <ipxe/acpi.h>
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#include <ipxe/acpipwr.h>
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/** @file
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*
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* ACPI power off
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*
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*/
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/** Colour for debug messages */
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#define colour FADT_SIGNATURE
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/** _S5_ signature */
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#define S5_SIGNATURE ACPI_SIGNATURE ( '_', 'S', '5', '_' )
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/**
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* Power off the computer using ACPI
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*
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* @ret rc Return status code
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*/
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int acpi_poweroff ( void ) {
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struct acpi_fadt fadtab;
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userptr_t fadt;
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unsigned int pm1a_cnt_blk;
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unsigned int pm1b_cnt_blk;
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unsigned int pm1a_cnt;
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unsigned int pm1b_cnt;
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unsigned int slp_typa;
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unsigned int slp_typb;
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int s5;
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int rc;
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/* Locate FADT */
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fadt = acpi_find ( FADT_SIGNATURE, 0 );
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if ( ! fadt ) {
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DBGC ( colour, "ACPI could not find FADT\n" );
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return -ENOENT;
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}
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/* Read FADT */
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copy_from_user ( &fadtab, fadt, 0, sizeof ( fadtab ) );
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pm1a_cnt_blk = le32_to_cpu ( fadtab.pm1a_cnt_blk );
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pm1b_cnt_blk = le32_to_cpu ( fadtab.pm1b_cnt_blk );
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pm1a_cnt = ( pm1a_cnt_blk + ACPI_PM1_CNT );
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pm1b_cnt = ( pm1b_cnt_blk + ACPI_PM1_CNT );
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/* Extract \_S5 from DSDT or any SSDT */
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s5 = acpi_sx ( S5_SIGNATURE );
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if ( s5 < 0 ) {
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rc = s5;
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DBGC ( colour, "ACPI could not extract \\_S5: %s\n",
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strerror ( rc ) );
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return rc;
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}
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/* Power off system */
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if ( pm1a_cnt_blk ) {
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slp_typa = ( ( s5 >> 0 ) & 0xff );
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DBGC ( colour, "ACPI PM1a sleep type %#x => %04x\n",
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slp_typa, pm1a_cnt );
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outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typa ) |
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ACPI_PM1_CNT_SLP_EN ), pm1a_cnt );
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}
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if ( pm1b_cnt_blk ) {
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slp_typb = ( ( s5 >> 8 ) & 0xff );
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DBGC ( colour, "ACPI PM1b sleep type %#x => %04x\n",
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slp_typb, pm1b_cnt );
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outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typb ) |
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ACPI_PM1_CNT_SLP_EN ), pm1b_cnt );
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}
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/* On some systems, execution will continue briefly. Delay to
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* avoid potentially confusing log messages.
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*/
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mdelay ( 1000 );
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DBGC ( colour, "ACPI power off failed\n" );
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return -EPROTO;
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}
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