mirror of
https://github.com/xcat2/xNBA.git
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295 lines
8.0 KiB
C
295 lines
8.0 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 <assert.h>
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#include <realmode.h>
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#include <console.h>
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#include <gpxe/ansiesc.h>
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#define ATTR_BOLD 0x08
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#define ATTR_FCOL_MASK 0x07
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#define ATTR_FCOL_BLACK 0x00
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#define ATTR_FCOL_BLUE 0x01
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#define ATTR_FCOL_GREEN 0x02
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#define ATTR_FCOL_CYAN 0x03
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#define ATTR_FCOL_RED 0x04
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#define ATTR_FCOL_MAGENTA 0x05
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#define ATTR_FCOL_YELLOW 0x06
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#define ATTR_FCOL_WHITE 0x07
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#define ATTR_BCOL_MASK 0x70
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#define ATTR_BCOL_BLACK 0x00
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#define ATTR_BCOL_BLUE 0x10
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#define ATTR_BCOL_GREEN 0x20
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#define ATTR_BCOL_CYAN 0x30
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#define ATTR_BCOL_RED 0x40
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#define ATTR_BCOL_MAGENTA 0x50
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#define ATTR_BCOL_YELLOW 0x60
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#define ATTR_BCOL_WHITE 0x70
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#define ATTR_DEFAULT ATTR_FCOL_WHITE
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/** Current character attribute */
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static unsigned int bios_attr = ATTR_DEFAULT;
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/**
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* Handle ANSI CUP (cursor position)
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*
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* @v count Parameter count
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* @v params[0] Row (1 is top)
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* @v params[1] Column (1 is left)
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*/
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static void bios_handle_cup ( unsigned int count __unused, int params[] ) {
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int cx = ( params[1] - 1 );
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int cy = ( params[0] - 1 );
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if ( cx < 0 )
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cx = 0;
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if ( cy < 0 )
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cy = 0;
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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" ( 0x0200 ), "b" ( 1 ),
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"d" ( ( cy << 8 ) | cx ) );
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}
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/**
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* Handle ANSI ED (erase in page)
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*
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* @v count Parameter count
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* @v params[0] Region to erase
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*/
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static void bios_handle_ed ( unsigned int count __unused,
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int params[] __unused ) {
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/* We assume that we always clear the whole screen */
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assert ( params[0] == ANSIESC_ED_ALL );
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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" ( 0x0600 ), "b" ( bios_attr << 8 ),
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"c" ( 0 ), "d" ( 0xffff ) );
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}
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/**
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* Handle ANSI SGR (set graphics rendition)
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*
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* @v count Parameter count
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* @v params List of graphic rendition aspects
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*/
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static void bios_handle_sgr ( unsigned int count, int params[] ) {
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static const uint8_t bios_attr_fcols[10] = {
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ATTR_FCOL_BLACK, ATTR_FCOL_RED, ATTR_FCOL_GREEN,
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ATTR_FCOL_YELLOW, ATTR_FCOL_BLUE, ATTR_FCOL_MAGENTA,
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ATTR_FCOL_CYAN, ATTR_FCOL_WHITE,
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ATTR_FCOL_WHITE, ATTR_FCOL_WHITE /* defaults */
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};
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static const uint8_t bios_attr_bcols[10] = {
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ATTR_BCOL_BLACK, ATTR_BCOL_RED, ATTR_BCOL_GREEN,
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ATTR_BCOL_YELLOW, ATTR_BCOL_BLUE, ATTR_BCOL_MAGENTA,
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ATTR_BCOL_CYAN, ATTR_BCOL_WHITE,
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ATTR_BCOL_BLACK, ATTR_BCOL_BLACK /* defaults */
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};
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unsigned int i;
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int aspect;
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for ( i = 0 ; i < count ; i++ ) {
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aspect = params[i];
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if ( aspect == 0 ) {
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bios_attr = ATTR_DEFAULT;
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} else if ( aspect == 1 ) {
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bios_attr |= ATTR_BOLD;
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} else if ( aspect == 22 ) {
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bios_attr &= ~ATTR_BOLD;
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} else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) {
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bios_attr &= ~ATTR_FCOL_MASK;
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bios_attr |= bios_attr_fcols[ aspect - 30 ];
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} else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) {
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bios_attr &= ~ATTR_BCOL_MASK;
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bios_attr |= bios_attr_bcols[ aspect - 40 ];
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}
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}
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}
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/** BIOS console ANSI escape sequence handlers */
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static struct ansiesc_handler bios_ansiesc_handlers[] = {
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{ ANSIESC_CUP, bios_handle_cup },
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{ ANSIESC_ED, bios_handle_ed },
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{ ANSIESC_SGR, bios_handle_sgr },
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{ 0, NULL }
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};
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/** BIOS console ANSI escape sequence context */
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static struct ansiesc_context bios_ansiesc_ctx = {
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.handlers = bios_ansiesc_handlers,
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};
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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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int discard_a, discard_b, discard_c;
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/* Intercept ANSI escape sequences */
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character = ansiesc_process ( &bios_ansiesc_ctx, character );
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if ( character < 0 )
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return;
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/* Print character with attribute */
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__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
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/* Skip non-printable characters */
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"cmpb $0x20, %%al\n\t"
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"jb 1f\n\t"
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/* Set attribute */
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"movw $0x0001, %%cx\n\t"
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"movb $0x09, %%ah\n\t"
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"int $0x10\n\t"
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"\n1:\n\t"
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/* Print character */
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"xorw %%bx, %%bx\n\t"
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"movb $0x0e, %%ah\n\t"
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"int $0x10\n\t"
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"cli\n\t" )
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: "=a" ( discard_a ), "=b" ( discard_b ),
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"=c" ( discard_c )
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: "a" ( character ), "b" ( bios_attr )
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: "ebp" );
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}
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/**
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* Pointer to current ANSI output sequence
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*
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* While we are in the middle of returning an ANSI sequence for a
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* special key, this will point to the next character to return. When
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* not in the middle of such a sequence, this will point to a NUL
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* (note: not "will be NULL").
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*/
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static const char *ansi_input = "";
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/**
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* Lowest BIOS scancode of interest
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*
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* Most of the BIOS key scancodes that we are interested in are in a
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* dense range, so subtracting a constant and treating them as offsets
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* into an array works efficiently.
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*/
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#define BIOS_KEY_MIN 0x47
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/** Offset into list of interesting BIOS scancodes */
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#define BIOS_KEY(scancode) ( (scancode) - BIOS_KEY_MIN )
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/** Mapping from BIOS scan codes to ANSI escape sequences */
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static const char *ansi_sequences[] = {
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[ BIOS_KEY ( 0x47 ) ] = "[H", /* Home */
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[ BIOS_KEY ( 0x48 ) ] = "[A", /* Up arrow */
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[ BIOS_KEY ( 0x4b ) ] = "[D", /* Left arrow */
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[ BIOS_KEY ( 0x4d ) ] = "[C", /* Right arrow */
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[ BIOS_KEY ( 0x4f ) ] = "[F", /* End */
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[ BIOS_KEY ( 0x50 ) ] = "[B", /* Down arrow */
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[ BIOS_KEY ( 0x53 ) ] = "[3~", /* Delete */
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};
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/**
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* Get ANSI escape sequence corresponding to BIOS scancode
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*
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* @v scancode BIOS scancode
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* @ret ansi_seq ANSI escape sequence, if any, otherwise NULL
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*/
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static const char * scancode_to_ansi_seq ( unsigned int scancode ) {
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unsigned int bios_key = BIOS_KEY ( scancode );
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if ( bios_key < ( sizeof ( ansi_sequences ) /
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sizeof ( ansi_sequences[0] ) ) ) {
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return ansi_sequences[bios_key];
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}
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return NULL;
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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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uint16_t keypress;
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unsigned int character;
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char *ansi_seq;
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/* If we are mid-sequence, pass out the next byte */
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if ( ( character = *ansi_input ) ) {
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ansi_input++;
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return character;
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}
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/* Read character from real BIOS console */
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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" ( keypress ) : "a" ( 0x1000 ) );
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character = ( keypress & 0xff );
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/* If it's a normal character, just return it */
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if ( character )
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return character;
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/* Otherwise, check for a special key that we know about */
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if ( ( ansi_seq = scancode_to_ansi_seq ( keypress >> 8 ) ) ) {
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/* Start of escape sequence: return ESC (0x1b) */
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ansi_input = ansi_seq;
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return 0x1b;
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}
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return 0;
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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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/* If we are mid-sequence, we are always ready */
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if ( *ansi_input )
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return 1;
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/* Otherwise check the real BIOS console */
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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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