/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 <assert.h>
#include <realmode.h>
#include <console.h>
#include <gpxe/ansiesc.h>
#define ATTR_BOLD 0x08
#define ATTR_FCOL_MASK 0x07
#define ATTR_FCOL_BLACK 0x00
#define ATTR_FCOL_BLUE 0x01
#define ATTR_FCOL_GREEN 0x02
#define ATTR_FCOL_CYAN 0x03
#define ATTR_FCOL_RED 0x04
#define ATTR_FCOL_MAGENTA 0x05
#define ATTR_FCOL_YELLOW 0x06
#define ATTR_FCOL_WHITE 0x07
#define ATTR_BCOL_MASK 0x70
#define ATTR_BCOL_BLACK 0x00
#define ATTR_BCOL_BLUE 0x10
#define ATTR_BCOL_GREEN 0x20
#define ATTR_BCOL_CYAN 0x30
#define ATTR_BCOL_RED 0x40
#define ATTR_BCOL_MAGENTA 0x50
#define ATTR_BCOL_YELLOW 0x60
#define ATTR_BCOL_WHITE 0x70
#define ATTR_DEFAULT ATTR_FCOL_WHITE
/** Current character attribute */
static unsigned int bios_attr = ATTR_DEFAULT;
/**
* Handle ANSI CUP (cursor position)
*
* @v count Parameter count
* @v params[0] Row (1 is top)
* @v params[1] Column (1 is left)
*/
static void bios_handle_cup ( unsigned int count __unused, int params[] ) {
int cx = ( params[1] - 1 );
int cy = ( params[0] - 1 );
if ( cx < 0 )
cx = 0;
if ( cy < 0 )
cy = 0;
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x10\n\t"
"cli\n\t" )
: : "a" ( 0x0200 ), "b" ( 1 ),
"d" ( ( cy << 8 ) | cx ) );
}
/**
* Handle ANSI ED (erase in page)
*
* @v count Parameter count
* @v params[0] Region to erase
*/
static void bios_handle_ed ( unsigned int count __unused,
int params[] __unused ) {
/* We assume that we always clear the whole screen */
assert ( params[0] == ANSIESC_ED_ALL );
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x10\n\t"
"cli\n\t" )
: : "a" ( 0x0600 ), "b" ( bios_attr << 8 ),
"c" ( 0 ), "d" ( 0xffff ) );
}
/**
* Handle ANSI SGR (set graphics rendition)
*
* @v count Parameter count
* @v params List of graphic rendition aspects
*/
static void bios_handle_sgr ( unsigned int count, int params[] ) {
static const uint8_t bios_attr_fcols[10] = {
ATTR_FCOL_BLACK, ATTR_FCOL_RED, ATTR_FCOL_GREEN,
ATTR_FCOL_YELLOW, ATTR_FCOL_BLUE, ATTR_FCOL_MAGENTA,
ATTR_FCOL_CYAN, ATTR_FCOL_WHITE,
ATTR_FCOL_WHITE, ATTR_FCOL_WHITE /* defaults */
};
static const uint8_t bios_attr_bcols[10] = {
ATTR_BCOL_BLACK, ATTR_BCOL_RED, ATTR_BCOL_GREEN,
ATTR_BCOL_YELLOW, ATTR_BCOL_BLUE, ATTR_BCOL_MAGENTA,
ATTR_BCOL_CYAN, ATTR_BCOL_WHITE,
ATTR_BCOL_BLACK, ATTR_BCOL_BLACK /* defaults */
};
unsigned int i;
int aspect;
for ( i = 0 ; i < count ; i++ ) {
aspect = params[i];
if ( aspect == 0 ) {
bios_attr = ATTR_DEFAULT;
} else if ( aspect == 1 ) {
bios_attr |= ATTR_BOLD;
} else if ( aspect == 22 ) {
bios_attr &= ~ATTR_BOLD;
} else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) {
bios_attr &= ~ATTR_FCOL_MASK;
bios_attr |= bios_attr_fcols[ aspect - 30 ];
} else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) {
bios_attr &= ~ATTR_BCOL_MASK;
bios_attr |= bios_attr_bcols[ aspect - 40 ];
}
}
}
/** BIOS console ANSI escape sequence handlers */
static struct ansiesc_handler bios_ansiesc_handlers[] = {
{ ANSIESC_CUP, bios_handle_cup },
{ ANSIESC_ED, bios_handle_ed },
{ ANSIESC_SGR, bios_handle_sgr },
{ 0, NULL }
};
/** BIOS console ANSI escape sequence context */
static struct ansiesc_context bios_ansiesc_ctx = {
.handlers = bios_ansiesc_handlers,
};
/**
* Print a character to BIOS console
*
* @v character Character to be printed
*/
static void bios_putchar ( int character ) {
/* Intercept ANSI escape sequences */
character = ansiesc_process ( &bios_ansiesc_ctx, character );
if ( character < 0 )
return;
/* Set attribute for printable characters */
if ( character >= 0x20 ) {
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x10\n\t"
"cli\n\t" )
: : "a" ( 0x0920 ), "b" ( bios_attr ),
"c" ( 1 ) );
}
/* Print the character */
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x10\n\t"
"cli\n\t" )
: : "a" ( character | 0x0e00 ), "b" ( 0 )
: "ebp" );
}
/**
* Get character from BIOS console
*
* @ret character Character read from console
*/
static int bios_getchar ( void ) {
uint8_t character;
__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
"int $0x16\n\t"
"cli\n\t" )
: "=a" ( character ) : "a" ( 0x0000 ) );
return character;
}
/**
* 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 ) {
unsigned int discard_a;
unsigned int flags;
__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" ( 0x0100 ) );
return ( ! ( flags & ZF ) );
}
struct console_driver bios_console __console_driver = {
.putchar = bios_putchar,
.getchar = bios_getchar,
.iskey = bios_iskey,
};
