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