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bc85368cdd
Commit 6149e0a ("[librm] Provide symbols for inline code placed into
other sections") may cause build failures due to duplicate label names
if the compiler chooses to duplicate inline assembly code.
Fix by using the "%=" special format string to include a
guaranteed-unique number within the label name.
The "%=" will be expanded only if constraints exist for the inline
assembly. This fix therefore requires that all REAL_CODE() fragments
use a (possibly empty) constraint list.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Copyright (C) 2010 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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/** @file
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*
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* Standard PC-BIOS reboot mechanism
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*
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*/
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#include <ipxe/reboot.h>
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#include <realmode.h>
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#include <bios.h>
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#include <ipxe/apm.h>
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#include <ipxe/acpipwr.h>
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/**
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* Reboot system
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*
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* @v warm Perform a warm reboot
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*/
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static void bios_reboot ( int warm ) {
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uint16_t flag;
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/* Configure BIOS for cold/warm reboot */
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flag = ( warm ? BDA_REBOOT_WARM : 0 );
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put_real ( flag, BDA_SEG, BDA_REBOOT );
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/* Jump to system reset vector */
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__asm__ __volatile__ ( REAL_CODE ( "ljmp $0xf000, $0xfff0" ) : );
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}
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/**
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* Power off system
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*
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* @ret rc Return status code
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*/
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static int bios_poweroff ( void ) {
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int rc;
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/* Try APM */
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if ( ( rc = apm_poweroff() ) != 0 )
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DBG ( "APM power off failed: %s\n", strerror ( rc ) );
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/* Try ACPI */
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if ( ( rc = acpi_poweroff() ) != 0 )
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DBG ( "ACPI power off failed: %s\n", strerror ( rc ) );
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return rc;
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}
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PROVIDE_REBOOT ( pcbios, reboot, bios_reboot );
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PROVIDE_REBOOT ( pcbios, poweroff, bios_poweroff );
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