mirror of
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78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* Copyright (C) 2006 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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#include <realmode.h>
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#include <console.h>
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/**
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* Print a character to BIOS console
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*
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* @v character Character to be printed
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*/
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static void bios_putchar ( int character ) {
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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"int $0x10\n\t"
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"cli\n\t" )
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: : "a" ( character | 0x0e00 ), "b" ( 1 )
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: "ebp" );
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}
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/**
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* Get character from BIOS console
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*
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* @ret character Character read from console
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*/
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static int bios_getchar ( void ) {
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uint8_t character;
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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"int $0x16\n\t"
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"cli\n\t" )
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: "=a" ( character ) : "a" ( 0x0000 ) );
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return character;
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}
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/**
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* Check for character ready to read from BIOS console
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*
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* @ret True Character available to read
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* @ret False No character available to read
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*/
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static int bios_iskey ( void ) {
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unsigned int discard_a;
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unsigned int flags;
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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"int $0x16\n\t"
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"pushfw\n\t"
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"popw %w0\n\t"
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"cli\n\t" )
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: "=r" ( flags ), "=a" ( discard_a )
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: "a" ( 0x0100 ) );
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return ( ! ( flags & ZF ) );
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}
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struct console_driver bios_console __console_driver = {
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.putchar = bios_putchar,
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.getchar = bios_getchar,
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.iskey = bios_iskey,
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};
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