/*-
 * Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
 * Copyright (c) 1997 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * From: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp
 */

#include <stand.h>
#include <bootstrap.h>
#include <btxv86.h>
#include <machine/psl.h>
#include "libi386.h"

#if KEYBOARD_PROBE
#include <machine/cpufunc.h>

static int	probe_keyboard(void);
#endif
static void	vidc_probe(struct console *cp);
static int	vidc_init(int arg);
static void	vidc_putchar(int c);
static int	vidc_getchar(void);
static int	vidc_ischar(void);

static int	vidc_started;

void		get_pos(int *x, int *y);

#ifdef TERM_EMU
#define MAXARGS		8
#define DEFAULT_FGCOLOR	7
#define DEFAULT_BGCOLOR	0

void		end_term(void);
void		bail_out(int c);
void		vidc_term_emu(int c);
void		curs_move(int *_x, int *_y, int x, int y);
void		write_char(int c, int fg, int bg);
void		scroll_up(int rows, int fg, int bg);
void		CD(void);
void		CM(void);
void		HO(void);

static int	args[MAXARGS], argc;
static int	fg_c, bg_c, curx, cury;
static int	esc;
#endif


struct console textvidc = {
    "vidconsole",
    "internal video/keyboard",
    0,
    vidc_probe,
    vidc_init,
    vidc_putchar,
    vidc_getchar,
    vidc_ischar
};

static void
vidc_probe(struct console *cp)
{
    /* look for a keyboard */
#if KEYBOARD_PROBE
    if (probe_keyboard())
#endif
    {
	cp->c_flags |= C_PRESENTIN;
    }

    /* XXX for now, always assume we can do BIOS screen output */
    cp->c_flags |= C_PRESENTOUT;
}

static int
vidc_init(int arg)
{
    int		i;

    if (vidc_started && arg == 0)
	return (0);
    vidc_started = 1;
#ifdef TERM_EMU
    /* Init terminal emulator */
    end_term();
    get_pos(&curx, &cury);
    curs_move(&curx, &cury, curx, cury);
    fg_c = DEFAULT_FGCOLOR;
    bg_c = DEFAULT_BGCOLOR;
#endif
    for (i = 0; i < 10 && vidc_ischar(); i++)
	(void)vidc_getchar();
    return (0);	/* XXX reinit? */
}

static void
vidc_biosputchar(int c)
{

    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0xe00 | (c & 0xff);
    v86.ebx = 0x7;
    v86int();
}

static void
vidc_rawputchar(int c)
{
    int		i;

    if (c == '\t') {
	int n;
#ifndef TERM_EMU
	int curx, cury;

	get_pos(&curx, &cury);
#endif

	n = 8 - ((curx + 8) % 8);
	for (i = 0; i < n; i++)
	    vidc_rawputchar(' ');
    } else {
#ifndef TERM_EMU
        vidc_biosputchar(c);
#else
	/* Emulate AH=0eh (teletype output) */
	switch(c) {
	case '\a':
	    vidc_biosputchar(c);
	    return;
	case '\r':
	    curx = 0;
	    curs_move(&curx, &cury, curx, cury);
	    return;
	case '\n':
	    cury++;
	    if (cury > 24) {
		scroll_up(1, fg_c, bg_c);
		cury--;
	    } else {
		curs_move(&curx, &cury, curx, cury);
	    }
	    return;
	case '\b':
	    if (curx > 0) {
		curx--;
		curs_move(&curx, &cury, curx, cury);
		/* write_char(' ', fg_c, bg_c); XXX destructive(!) */
		return;
	    }
	    return;
	default:
	    write_char(c, fg_c, bg_c);
	    curx++;
	    if (curx > 79) {
		curx = 0;
		cury++;
	    }
	    if (cury > 24) {
		curx = 0;
		scroll_up(1, fg_c, bg_c);
		cury--;
	    }
	}
	curs_move(&curx, &cury, curx, cury);
#endif
    }
}

/* Get cursor position on the screen. Result is in edx. Sets
 * curx and cury appropriately.
 */
void
get_pos(int *x, int *y)
{

    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0300;
    v86.ebx = 0x0;
    v86int();
    *x = v86.edx & 0x00ff;
    *y = (v86.edx & 0xff00) >> 8;
}

#ifdef TERM_EMU

/* Move cursor to x rows and y cols (0-based). */
void
curs_move(int *_x, int *_y, int x, int y)
{

    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0200;
    v86.ebx = 0x0;
    v86.edx = ((0x00ff & y) << 8) + (0x00ff & x);
    v86int();
    *_x = x;
    *_y = y;
    /* If there is ctrl char at this position, cursor would be invisible.
     * Make it a space instead.
     */
    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0800;
    v86.ebx = 0x0;
    v86int();
#define isvisible(c)	(((c) >= 32) && ((c) < 255))
    if (!isvisible(v86.eax & 0x00ff)) {
	write_char(' ', fg_c, bg_c);
    }
}

/* Scroll up the whole window by a number of rows. If rows==0,
 * clear the window. fg and bg are attributes for the new lines
 * inserted in the window.
 */
void
scroll_up(int rows, int fgcol, int bgcol)
{

    if (rows == 0)
	rows = 25;
    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0600 + (0x00ff & rows);
    v86.ebx = (bgcol << 12) + (fgcol << 8);
    v86.ecx = 0x0;
    v86.edx = 0x184f;
    v86int();
}

/* Write character and attribute at cursor position. */
void
write_char(int c, int fgcol, int bgcol)
{

    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0900 + (0x00ff & c);
    v86.ebx = (bgcol << 4) + fgcol;
    v86.ecx = 0x1;
    v86int();
}

/**************************************************************/
/*
 * Screen manipulation functions. They use accumulated data in
 * args[] and argc variables.
 *
 */

/* Clear display from current position to end of screen */
void
CD(void)
{

    get_pos(&curx, &cury);
    if (curx > 0) {
	v86.ctl = 0;
	v86.addr = 0x10;
	v86.eax = 0x0600;
	v86.ebx = (bg_c << 4) + fg_c;
	v86.ecx = (cury << 8) + curx;
	v86.edx = (cury << 8) + 79;
	v86int();
	if (++cury > 24) {
	    end_term();
	    return;
	}
    }
    v86.ctl = 0;
    v86.addr = 0x10;
    v86.eax = 0x0600;
    v86.ebx = (bg_c << 4) + fg_c;
    v86.ecx = (cury << 8) + 0;
    v86.edx = (24 << 8) + 79;
    v86int();
    end_term();
}

/* Absolute cursor move to args[0] rows and args[1] columns
 * (the coordinates are 1-based).
 */
void
CM(void)
{

    if (args[0] > 0)
	args[0]--;
    if (args[1] > 0)
	args[1]--;
    curs_move(&curx, &cury, args[1], args[0]);
    end_term();
}

/* Home cursor (left top corner) */
void
HO(void)
{

    argc = 1;
    args[0] = args[1] = 1;
    CM();
}

/* Clear internal state of the terminal emulation code */
void
end_term(void)
{

    esc = 0;
    argc = -1;
}

/* Gracefully exit ESC-sequence processing in case of misunderstanding */
void
bail_out(int c)
{
    char buf[16], *ch;
    int i;

    if (esc) {
	vidc_rawputchar('\033');
	if (esc != '\033')
	    vidc_rawputchar(esc);
	for (i = 0; i <= argc; ++i) {
	    sprintf(buf, "%d", args[i]);
	    ch = buf;
	    while (*ch)
		vidc_rawputchar(*ch++);
	}
    }
    vidc_rawputchar(c);
    end_term();
}

static void
get_arg(int c)
{

    if (argc < 0)
	argc = 0;
    args[argc] *= 10;
    args[argc] += c - '0';
}

/* Emulate basic capabilities of cons25 terminal */
void
vidc_term_emu(int c)
{
    static int ansi_col[] = {
	0, 4, 2, 6, 1, 5, 3, 7,
    };
    int t;
    int i;

    switch (esc) {
    case 0:
	switch (c) {
	case '\033':
	    esc = c;
	    break;
	default:
	    vidc_rawputchar(c);
	    break;
	}
	break;

    case '\033':
	switch (c) {
	case '[':
	    esc = c;
	    args[0] = 0;
	    argc = -1;
	    break;
	default:
	    bail_out(c);
	    break;
	}
	break;

    case '[':
	switch (c) {
	case ';':
	    if (argc < 0)	/* XXX */
		argc = 0;
	    else if (argc + 1 >= MAXARGS)
		bail_out(c);
	    else
		args[++argc] = 0;
	    break;
	case 'H':
	    if (argc < 0)
		HO();
	    else if (argc == 1)
		CM();
	    else
		bail_out(c);
	    break;
	case 'J':
	    if (argc < 0)
		CD();
	    else
		bail_out(c);
	    break;
	case 'm':
	    if (argc < 0) {
		fg_c = DEFAULT_FGCOLOR;
		bg_c = DEFAULT_BGCOLOR;
	    }
	    for (i = 0; i <= argc; ++i) {
		switch (args[i]) {
		case 0:		/* back to normal */
		    fg_c = DEFAULT_FGCOLOR;
		    bg_c = DEFAULT_BGCOLOR;
		    break;
		case 1:		/* bold */
		    fg_c |= 0x8;
		    break;
		case 4:		/* underline */
		case 5:		/* blink */
		    bg_c |= 0x8;
		    break;
		case 7:		/* reverse */
		    t = fg_c;
		    fg_c = bg_c;
		    bg_c = t;
		    break;
		case 22:	/* normal intensity */
		    fg_c &= ~0x8;
		    break;
		case 24:	/* not underline */
		case 25:	/* not blinking */
		    bg_c &= ~0x8;
		    break;
		case 30: case 31: case 32: case 33:
		case 34: case 35: case 36: case 37:
		    fg_c = ansi_col[args[i] - 30];
		    break;
		case 39:	/* normal */
		    fg_c = DEFAULT_FGCOLOR;
		    break;
		case 40: case 41: case 42: case 43:
		case 44: case 45: case 46: case 47:
		    bg_c = ansi_col[args[i] - 40];
		    break;
		case 49:	/* normal */
		    bg_c = DEFAULT_BGCOLOR;
		    break;
		}
	    }
	    end_term();
	    break;
	default:
	    if (isdigit(c))
		get_arg(c);
	    else
		bail_out(c);
	    break;
	}
	break;

    default:
	bail_out(c);
	break;
    }
}
#endif

static void
vidc_putchar(int c)
{
#ifdef TERM_EMU
    vidc_term_emu(c);
#else
    vidc_rawputchar(c);
#endif
}

static int
vidc_getchar(void)
{

    if (vidc_ischar()) {
	v86.ctl = 0;
	v86.addr = 0x16;
	v86.eax = 0x0;
	v86int();
	return (v86.eax & 0xff);
    } else {
	return (-1);
    }
}

static int
vidc_ischar(void)
{

    v86.ctl = V86_FLAGS;
    v86.addr = 0x16;
    v86.eax = 0x100;
    v86int();
    return (!V86_ZR(v86.efl));
}

#if KEYBOARD_PROBE

#define PROBE_MAXRETRY	5
#define PROBE_MAXWAIT	400
#define IO_DUMMY	0x84
#define IO_KBD		0x060		/* 8042 Keyboard */

/* selected defines from kbdio.h */
#define KBD_STATUS_PORT 	4	/* status port, read */
#define KBD_DATA_PORT		0	/* data port, read/write
					 * also used as keyboard command
					 * and mouse command port
					 */
#define KBDC_ECHO		0x00ee
#define KBDS_ANY_BUFFER_FULL	0x0001
#define KBDS_INPUT_BUFFER_FULL	0x0002
#define KBD_ECHO		0x00ee

/* 7 microsec delay necessary for some keyboard controllers */
static void
delay7(void)
{
    /*
     * I know this is broken, but no timer is available yet at this stage...
     * See also comments in `delay1ms()'.
     */
    inb(IO_DUMMY); inb(IO_DUMMY);
    inb(IO_DUMMY); inb(IO_DUMMY);
    inb(IO_DUMMY); inb(IO_DUMMY);
}

/*
 * This routine uses an inb to an unused port, the time to execute that
 * inb is approximately 1.25uS.  This value is pretty constant across
 * all CPU's and all buses, with the exception of some PCI implentations
 * that do not forward this I/O address to the ISA bus as they know it
 * is not a valid ISA bus address, those machines execute this inb in
 * 60 nS :-(.
 *
 */
static void
delay1ms(void)
{
    int i = 800;
    while (--i >= 0)
	(void)inb(0x84);
}

/*
 * We use the presence/absence of a keyboard to determine whether the internal
 * console can be used for input.
 *
 * Perform a simple test on the keyboard; issue the ECHO command and see
 * if the right answer is returned. We don't do anything as drastic as
 * full keyboard reset; it will be too troublesome and take too much time.
 */
static int
probe_keyboard(void)
{
    int retry = PROBE_MAXRETRY;
    int wait;
    int i;

    while (--retry >= 0) {
	/* flush any noise */
	while (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) {
	    delay7();
	    inb(IO_KBD + KBD_DATA_PORT);
	    delay1ms();
	}

	/* wait until the controller can accept a command */
	for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
	    if (((i = inb(IO_KBD + KBD_STATUS_PORT))
                & (KBDS_INPUT_BUFFER_FULL | KBDS_ANY_BUFFER_FULL)) == 0)
		break;
	    if (i & KBDS_ANY_BUFFER_FULL) {
		delay7();
	        inb(IO_KBD + KBD_DATA_PORT);
	    }
	    delay1ms();
	}
	if (wait <= 0)
	    continue;

	/* send the ECHO command */
	outb(IO_KBD + KBD_DATA_PORT, KBDC_ECHO);

	/* wait for a response */
	for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
	     if (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL)
		 break;
	     delay1ms();
	}
	if (wait <= 0)
	    continue;

	delay7();
	i = inb(IO_KBD + KBD_DATA_PORT);
#ifdef PROBE_KBD_BEBUG
        printf("probe_keyboard: got 0x%x.\n", i);
#endif
	if (i == KBD_ECHO) {
	    /* got the right answer */
	    return (1);
	}
    }

    return (0);
}
#endif /* KEYBOARD_PROBE */