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Updated to REAL_CODE().

This commit is contained in:
Michael Brown 2006-05-24 13:24:22 +00:00
parent 04d6005d77
commit c4d688c005
1 changed files with 55 additions and 53 deletions
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108
src/arch/i386/firmware/pcbios/bios_console.c
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@ -1,71 +1,73 @@
/* Etherboot routines for PCBIOS firmware. /*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
* *
* Body of routines taken from old pcbios.S * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/ */
#include "realmode.h" #include <realmode.h>
#include "console.h" #include <console.h>
#define ZF ( 1 << 6 ) /**
* Print a character to BIOS console
/************************************************************************** *
bios_putchar - Print a character on console * @v character Character to be printed
**************************************************************************/ */
static void bios_putchar ( int character ) { static void bios_putchar ( int character ) {
REAL_EXEC ( rm_console_putc,
"sti\n\t"
"movb $0x0e, %%ah\n\t"
"movl $1, %%ebx\n\t"
"int $0x10\n\t"
"cli\n\t",
1,
OUT_CONSTRAINTS ( "=a" ( character ) ),
IN_CONSTRAINTS ( "a" ( character ) ),
CLOBBER ( "ebx", "ecx", "edx", "ebp", "esi", "edi" ) );
/* NOTE: %eax may be clobbered, so must be specified as an output __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
* parameter, even though we don't then do anything with it. "int $0x10\n\t"
*/ "cli\n\t" )
: : "a" ( character | 0x0e00 ), "b" ( 1 )
: "ebp" );
} }
/************************************************************************** /**
bios_getchar - Get a character from console * Get character from BIOS console
**************************************************************************/ *
* @ret character Character read from console
*/
static int bios_getchar ( void ) { static int bios_getchar ( void ) {
uint16_t character; uint8_t character;
REAL_EXEC ( rm_console_getc, __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"sti\n\t" "int $0x16\n\t"
"xorw %%ax, %%ax\n\t" "cli\n\t" )
"int $0x16\n\t" : "=a" ( character ) : "a" ( 0x0000 ) );
"cli\n\t",
1, return character;
OUT_CONSTRAINTS ( "=a" ( character ) ),
IN_CONSTRAINTS (),
CLOBBER ( "ebx", "ecx", "edx", "ebp", "esi", "edi" ) );
return ( character & 0xff );
} }
/************************************************************************** /**
bios_iskey - Check for keyboard interrupt * Check for character ready to read from BIOS console
**************************************************************************/ *
* @ret True Character available to read
* @ret False No character available to read
*/
static int bios_iskey ( void ) { static int bios_iskey ( void ) {
uint16_t flags; unsigned int discard_a;
unsigned int flags;
REAL_EXEC ( rm_console_ischar, __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"sti\n\t" "int $0x16\n\t"
"movb $1, %%ah\n\t" "pushfw\n\t"
"int $0x16\n\t" "popw %w0\n\t"
"pushfw\n\t" "cli\n\t" )
"popw %%ax\n\t" : "=r" ( flags ), "=a" ( discard_a )
"cli\n\t", : "a" ( 0x0001 ) );
1,
OUT_CONSTRAINTS ( "=a" ( flags ) ),
IN_CONSTRAINTS (),
CLOBBER ( "ebx", "ecx", "edx", "ebp", "esi", "edi" ) );
return ( ( flags & ZF ) == 0 ); return ( ! ( flags & ZF ) );
} }
struct console_driver bios_console __console_driver = { struct console_driver bios_console __console_driver = {