mirror of
https://github.com/ipxe/ipxe
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8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* BIOS timer
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*
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*/
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#include <ipxe/timer.h>
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#include <realmode.h>
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#include <bios.h>
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/**
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* Get current system time in ticks
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*
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* @ret ticks Current time, in ticks
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*
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* Use direct memory access to BIOS variables, longword 0040:006C
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* (ticks today) and byte 0040:0070 (midnight crossover flag) instead
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* of calling timeofday BIOS interrupt.
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*/
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static unsigned long bios_currticks ( void ) {
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static int days = 0;
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uint32_t ticks;
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uint8_t midnight;
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/* Re-enable interrupts so that the timer interrupt can occur */
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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"nop\n\t"
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"nop\n\t"
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"cli\n\t" ) : : );
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get_real ( ticks, BDA_SEG, 0x006c );
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get_real ( midnight, BDA_SEG, 0x0070 );
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if ( midnight ) {
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midnight = 0;
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put_real ( midnight, BDA_SEG, 0x0070 );
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days += 0x1800b0;
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}
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return ( days + ticks );
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}
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PROVIDE_TIMER_INLINE ( pcbios, udelay );
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PROVIDE_TIMER ( pcbios, currticks, bios_currticks );
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PROVIDE_TIMER_INLINE ( pcbios, ticks_per_sec );
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