mirror of
https://github.com/xcat2/xNBA.git
synced 2024-12-23 19:51:46 +00:00
Updated to REAL_CODE().
This commit is contained in:
parent
04d6005d77
commit
c4d688c005
@ -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 "console.h"
|
||||
#include <realmode.h>
|
||||
#include <console.h>
|
||||
|
||||
#define ZF ( 1 << 6 )
|
||||
|
||||
/**************************************************************************
|
||||
bios_putchar - Print a character on console
|
||||
**************************************************************************/
|
||||
/**
|
||||
* Print a character to BIOS console
|
||||
*
|
||||
* @v character Character to be printed
|
||||
*/
|
||||
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
|
||||
* parameter, even though we don't then do anything with it.
|
||||
*/
|
||||
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
|
||||
"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 ) {
|
||||
uint16_t character;
|
||||
uint8_t character;
|
||||
|
||||
REAL_EXEC ( rm_console_getc,
|
||||
"sti\n\t"
|
||||
"xorw %%ax, %%ax\n\t"
|
||||
"int $0x16\n\t"
|
||||
"cli\n\t",
|
||||
1,
|
||||
OUT_CONSTRAINTS ( "=a" ( character ) ),
|
||||
IN_CONSTRAINTS (),
|
||||
CLOBBER ( "ebx", "ecx", "edx", "ebp", "esi", "edi" ) );
|
||||
|
||||
return ( character & 0xff );
|
||||
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
|
||||
"int $0x16\n\t"
|
||||
"cli\n\t" )
|
||||
: "=a" ( character ) : "a" ( 0x0000 ) );
|
||||
|
||||
return character;
|
||||
}
|
||||
|
||||
/**************************************************************************
|
||||
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 ) {
|
||||
uint16_t flags;
|
||||
unsigned int discard_a;
|
||||
unsigned int flags;
|
||||
|
||||
REAL_EXEC ( rm_console_ischar,
|
||||
"sti\n\t"
|
||||
"movb $1, %%ah\n\t"
|
||||
"int $0x16\n\t"
|
||||
"pushfw\n\t"
|
||||
"popw %%ax\n\t"
|
||||
"cli\n\t",
|
||||
1,
|
||||
OUT_CONSTRAINTS ( "=a" ( flags ) ),
|
||||
IN_CONSTRAINTS (),
|
||||
CLOBBER ( "ebx", "ecx", "edx", "ebp", "esi", "edi" ) );
|
||||
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
|
||||
"int $0x16\n\t"
|
||||
"pushfw\n\t"
|
||||
"popw %w0\n\t"
|
||||
"cli\n\t" )
|
||||
: "=r" ( flags ), "=a" ( discard_a )
|
||||
: "a" ( 0x0001 ) );
|
||||
|
||||
return ( ( flags & ZF ) == 0 );
|
||||
return ( ! ( flags & ZF ) );
|
||||
}
|
||||
|
||||
struct console_driver bios_console __console_driver = {
|
||||
|
Loading…
Reference in New Issue
Block a user