/* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility to
  anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer to
  the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given to
  you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
  
  Aladdin Enterprises is not affiliated with the Free Software Foundation or
  the GNU Project.  GNU Ghostscript, as distributed by Aladdin Enterprises,
  does not depend on any other GNU software.
*/

/* gdevsco.c - 17Jul91 - wb - based on gdevpcfb.c */
/* 31Jul91 - Rick Calder rick@rick.att.com - ifdefs for AT&T UNIX 4.0 2.1 */
/* 13Sep91 - wb - modify for gs24b2 */
/*  9Mar92 - wb - modify for gs24b4 */
/* generate SCO Xenix/Unix style memory mapped ioctl output */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gxdevice.h"
#include "gdevpcfb.h"
#include <signal.h>

#ifdef M_XENIX
#include <sys/console.h>		/* SCO Xenix and SCO UNIX */
#ifndef CONSIO
#include <sys/machdep.h>		/* Xenix needs this also */
#endif
#else
#include <sys/kd.h>			/* AT&T SVR4 */
#endif

#if defined(__STDC__)
#include "stdlib.h"
#else
extern char *getenv(P1(const char *));
#endif

#if defined(M_XENIX)
#include "prototypes.h"
#include "fcntl.h"
#else
extern int ioctl(P3(int, int, ...));
extern int open(P3(const char *, int, ...));
#endif

private int console_fd = -1;	/* file descriptor of console */
fb_ptr fb_addr;			/* address of frame buffer for unix */
private int cur_mode = -1;	/* current video mode */

/* open the console */
/* possible files to open:
 * /dev/console = current system console
 * /dev/vga = vga monitor
 * /dev/tty = current terminal
 */

private void open_console(P1(void));

private void
open_console()
{
	const char *dev;
	if (console_fd != -1) return;
	dev = getenv("GSDEVICE");
	if (dev == NULL || *dev == '\0')
		dev = "/dev/tty";
	console_fd = open(dev, 0);
	if (console_fd == -1) {
		ega_close((gx_device *)NULL);
		eprintf1("unable to map display '%s'\n", dev);
		perror("open_console");
		exit(1);
	}
}

#if defined(__GNUC__)
	/* Done with inline assembly in gdevpcfb.h */
#else
/* Output to a port */
void
outportb(uint port, byte data)
{
	int i;
	struct port_io_arg pio;

	if (console_fd == -1) open_console();
	pio.args[0].dir = OUT_ON_PORT;
	pio.args[0].port = port;
	pio.args[0].data = data;
	pio.args[1].port = 0;
	pio.args[2].port = 0;
	pio.args[3].port = 0;
	i = ioctl(console_fd, CONSIO, (long)(&pio));
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("error setting device register\n");
		perror("outportb");
		exit(1);
	}
}

/* Output to 2 consecutive ports */
void
outport2(uint port, byte index, byte data)
{
	int i;
	struct port_io_arg pio;

	if (console_fd == -1) open_console();
	pio.args[0].dir = OUT_ON_PORT;
	pio.args[0].port = port;
	pio.args[0].data = index;
	pio.args[1].dir = OUT_ON_PORT;
	pio.args[1].port = port + 1;
	pio.args[1].data = data;
	pio.args[2].port = 0;
	pio.args[3].port = 0;
	i = ioctl(console_fd, CONSIO, (long)(&pio));
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("error setting device register\n");
		perror("outport2");
		exit(1);
	}
}
#endif

/* interrupt signal handler */
/*  restore the video mode and exit */
private void
ega_int_handler(int sig)
{
	ega_close((gx_device *)NULL);
	eprintf("GS exiting...\n");
	exit(1);
}

/*
 * FIXME to make this work, the SIGCONT handler must restore the
 * the video state, including all the registers.
 * For now, I made the SIGSTOP handler exit just call the SIGINT handler
 */

#ifdef	SIGTSTP
/* user tried to stop us.  restore video and stop */
private void
ega_tstp_handler(int sig)
{
#if 1
	ega_int_handler(sig);
#else
	/* Preferable, but sco does not restore the monitor corretly */
	signal(SIGTSTP, ega_tstp_handler);
	ega_close((gx_device *)NULL);
	eprintf("GS stopping...\n");
	signal(SIGSTOP,SIG_DFL);
	kill(getpid(), SIGSTOP);
#endif
}
#endif	/* SIGTSTP */

#ifdef	SIGCONT
/* we were unstopped.  reopen video */
private void
ega_cont_handler(int sig)
{
#if 1
	ega_int_handler(sig);
#else
	signal(SIGCONT, ega_cont_handler);
	ega_set_mode(cur_mode);
#endif
}
#endif	/* SIGCONT */

/* ------ Internal routines ------ */

/* Catch signals so we can restore the video mode on exit. */
void
pcfb_set_signals(gx_device *dev)
{	signal(SIGINT, ega_int_handler);
	signal(SIGTERM, ega_int_handler);
#ifdef	SIGTSTP
	signal(SIGTSTP, ega_tstp_handler);
#endif
#ifdef	SIGCONT
	signal(SIGCONT, ega_cont_handler);
#endif
}

/* Read the device mode */
void
pcfb_get_state(pcfb_bios_state *pbs)
{	int mode;
	open_console();
	mode = ioctl(console_fd, CONS_CURRENT, 0L);
	if (mode == -1) {
#ifdef __linux__
		mode = M_ENH_C80x25;
#else
		ega_close((gx_device *)NULL);
		eprintf("unable to get current console mode\n");
		perror("pcfb_get_state");
		exit(1);
#endif
	}
	pbs->display_mode =
		(mode == M_ENH_CG640 || mode == M_CG640x350 ? 0x10 :
#ifdef M_VGA12
		 mode == M_VGA12 ? 0x12 :
#endif
		 0x03);
}

/* Set the device mode */
void
pcfb_set_mode(int mode)
{	int i, mode1;
	open_console();
	cur_mode = mode;
	mode1 = -1;
	if (mode == 0x10) mode = SW_ENH_CG640;
#ifdef SW_VGA12
	else if (mode == 0x12) mode = SW_VGA12;
#endif
	else if (mode == 0x03) {
#ifdef SW_VGA80x25
		mode = SW_VGA80x25; mode1 = SW_ENHC80x25;
#else
		mode = SW_ENHC80x25;
#endif
	} else {
		eprintf1("can not set to video mode %d\n", mode);
		exit(1);
	}
	i = ioctl(console_fd, mode, 0L);
	if (i == -1 && mode1 != -1)
		i = ioctl(console_fd, mode1, 0L);
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to set console mode\n");
		perror("pcfb_set_mode");
		exit(1);
	}
#ifdef VGA_IOPRIVL
	if (ioctl(console_fd, VGA_IOPRIVL, 1) == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to get I/O privilege\n");
		perror("pcfb_set_mode");
		exit(1);
	}
#endif
	i = ioctl(console_fd, MAPCONS, 0L);
	if (i == -1) {
		ega_close((gx_device *)NULL);
		eprintf("unable to map console adaptor's display memory\n");
		perror("pcfb_set_mode");
		exit(1);
	}
	fb_addr = (fb_ptr) (i);
}

/* Restore the device state */
void
pcfb_set_state(const pcfb_bios_state *pbs)
{	pcfb_set_mode(pbs->display_mode);
}