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/*

 * Copyright (C) 2006 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.

 */

#include <stdlib.h>

#include <unistd.h>

#include <align.h>

#include <async.h>

#include <ipc/ipc.h>

#include <errno.h>

#include <stdio.h>

#include <ddi.h>

#include <sysinfo.h>

#include <as.h>

#include <ipc/fb.h>

#include <ipc/ipc.h>

#include <ipc/ns.h>

#include <ipc/services.h>

#include "ega.h"

#include "../console/screenbuffer.h"

#include "main.h"

#define MAX_SAVED_SCREENS 256

typedef struct saved_screen {

	short *data;

} saved_screen;

saved_screen saved_screens[MAX_SAVED_SCREENS];

#define EGA_IO_ADDRESS 0x3d4

#define EGA_IO_SIZE 2

typedef unsigned char u8;

typedef unsigned short u16;

typedef unsigned int u32;

/* Allow only 1 connection */

static int client_connected = 0;

static unsigned int scr_width;

static unsigned int scr_height;

static char *scr_addr;

static unsigned int style = 0x1e;

static inline void outb(u16 port, u8 b)

{

	asm volatile ("outb %0, %1\n" :: "a" (b), "d" (port));

}

static inline void outw(u16 port, u16 w)

{

	asm volatile ("outw %0, %1\n" :: "a" (w), "d" (port));

}

static inline void outl(u16 port, u32 l)

{

	asm volatile ("outl %0, %1\n" :: "a" (l), "d" (port));

}

static inline u8 inb(u16 port)

{

	u8 val;

	asm volatile ("inb %1, %0 \n" : "=a" (val) : "d"(port));

	return val;

}

static inline u16 inw(u16 port)

{

	u16 val;

	asm volatile ("inw %1, %0 \n" : "=a" (val) : "d"(port));

	return val;

}

static inline u32 inl(u16 port)

{

	u32 val;

	asm volatile ("inl %1, %0 \n" : "=a" (val) : "d"(port));

	return val;

}

static void clrscr(void)

{

	int i;

	for (i=0; i < scr_width*scr_height; i++) {

		scr_addr[i*2] = ' ';

		scr_addr[i*2+1] = style;

	}

}

static void cursor_goto(unsigned int row, unsigned int col)

{

	int ega_cursor;

	ega_cursor=col+scr_width*row;

	outb(EGA_IO_ADDRESS    , 0xe);

	outb(EGA_IO_ADDRESS + 1, (ega_cursor >>8) & 0xff);

	outb(EGA_IO_ADDRESS    , 0xf);

	outb(EGA_IO_ADDRESS + 1, ega_cursor & 0xff);

}

static void cursor_disable(void)

{

	u8 stat;

	outb(EGA_IO_ADDRESS , 0xa);

	stat=inb(EGA_IO_ADDRESS + 1);

	outb(EGA_IO_ADDRESS , 0xa);

	outb(EGA_IO_ADDRESS +1 ,stat | (1<<5) );

}

static void cursor_enable(void)

{

	u8 stat;

	outb(EGA_IO_ADDRESS , 0xa);

	stat=inb(EGA_IO_ADDRESS + 1);

	outb(EGA_IO_ADDRESS , 0xa);

	outb(EGA_IO_ADDRESS +1 ,stat & (~(1<<5)) );

}

static void scroll(int rows)

{

	int i;

	if (rows > 0) {

		memcpy (scr_addr,((char *)scr_addr) + rows * scr_width * 2, scr_width * scr_height * 2 - rows * scr_width * 2);

		for (i = 0; i < rows * scr_width ; i ++)

			(((short *)scr_addr) + scr_width * scr_height - rows * scr_width) [i] = ((style << 8) + ' ');

	} else if (rows < 0) {

		memcpy (((char *)scr_addr) - rows * scr_width * 2 ,scr_addr ,scr_width * scr_height * 2 + rows * scr_width * 2);

		for (i = 0; i < - rows * scr_width ; i++)

			((short *)scr_addr) [i] = ((style << 8 ) + ' ');

	}

}

static void printchar(char c, unsigned int row, unsigned int col)

{

	scr_addr[(row*scr_width + col)*2] = c;

	scr_addr[(row*scr_width + col)*2+1] = style;

	cursor_goto(row,col+1);

}

static void draw_text_data(keyfield_t *data)

{

	int i;

	for (i=0; i < scr_width*scr_height; i++) {

		scr_addr[i*2] = data[i].character;

		if (data[i].style.fg_color > data[i].style.bg_color)

			scr_addr[i*2+1] = 0x1e;

		else

			scr_addr[i*2+1] = 0xe1;

	}

}

static int save_screen(void)

{

	int i;

	short *mem;

	for (i=0 ;( i < MAX_SAVED_SCREENS ) && (saved_screens[i].data); i++);

	if (i == MAX_SAVED_SCREENS) 

		return EINVAL;

	if (!(saved_screens[i].data=malloc( 2 * scr_width*scr_height ))) 

		return ENOMEM;

	memcpy (saved_screens[i].data ,scr_addr ,2 * scr_width * scr_height)

		;

	return i;

}

static int print_screen(int i)

{

	if (saved_screens[i].data)

			memcpy (scr_addr,saved_screens[i].data, 2 * scr_width * scr_height);

	else return EINVAL;

	return i;

}

static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

	int retval;

	ipc_callid_t callid;

	ipc_call_t call;

	char c;

	unsigned int row, col;

	int bgcolor,fgcolor;

	keyfield_t *interbuf = NULL;

	size_t intersize = 0;

	int i;

	if (client_connected) {

		ipc_answer_fast(iid, ELIMIT, 0,0);

		return;

	}

	client_connected = 1;

	ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */

	while (1) {

		callid = async_get_call(&call);

 		switch (IPC_GET_METHOD(call)) {

		case IPC_M_PHONE_HUNGUP:

			client_connected = 0;

			ipc_answer_fast(callid,0,0,0);

			return; /* Exit thread */

		case IPC_M_AS_AREA_SEND:

			/* We accept one area for data interchange */

			intersize = IPC_GET_ARG2(call);

			if (intersize >= scr_width*scr_height*sizeof(*interbuf)) {

				receive_comm_area(callid,&call,(void **)&interbuf);

				continue;

			}

			retval = EINVAL;

			break;

		case FB_DRAW_TEXT_DATA:

			if (!interbuf) {

				retval = EINVAL;

				break;

			}

			draw_text_data(interbuf);

			retval = 0;

			break;

		case FB_GET_CSIZE:

			ipc_answer_fast(callid, 0, scr_height, scr_width);

			continue;

		case FB_CLEAR:

			clrscr();

			retval = 0;

			break;

		case FB_PUTCHAR:

			c = IPC_GET_ARG1(call);

			row = IPC_GET_ARG2(call);

			col = IPC_GET_ARG3(call);

			if (col >= scr_width || row >= scr_height) {

				retval = EINVAL;

				break;

			}

			printchar(c,row,col);

			retval = 0;

			break;

 		case FB_CURSOR_GOTO:

			row = IPC_GET_ARG1(call);

			col = IPC_GET_ARG2(call);

			if (row >= scr_height || col >= scr_width) {

				retval = EINVAL;

				break;

			}

			cursor_goto(row,col);

 			retval = 0;

 			break;

		case FB_SCROLL:

			i = IPC_GET_ARG1(call);

			if (i > scr_height || i < (- (int)scr_height)) {

				retval = EINVAL;

				break;

			}

			scroll(i);

			retval = 0;

			break;

		case FB_CURSOR_VISIBILITY:

			if(IPC_GET_ARG1(call))

				cursor_enable();

			else

				cursor_disable();

			retval = 0;

			break;

		case FB_SET_STYLE:

			fgcolor = IPC_GET_ARG1(call);

			bgcolor = IPC_GET_ARG2(call);

			if (fgcolor > bgcolor)

				style = 0x1e;

			else

				style = 0xe1;

		case FB_VP_DRAW_PIXMAP:

			i = IPC_GET_ARG2(call);

			retval = print_screen(i);

			break;

		case FB_VP2PIXMAP:

			retval = save_screen();

			break;

		case FB_DROP_PIXMAP:

			i = IPC_GET_ARG1(call);

			if (i >= MAX_SAVED_SCREENS) {

				retval = EINVAL;

				break;

			}

			if (saved_screens[i].data) {

				free(saved_screens[i].data);

				saved_screens[i].data = NULL;

			}

			break;

		default:

			retval = ENOENT;

		}

		ipc_answer_fast(callid,retval,0,0);

	}

}

int ega_init(void)

{

	void *ega_ph_addr;

	size_t sz;

	ega_ph_addr=(void *)sysinfo_value("fb.address.physical");

	scr_width=sysinfo_value("fb.width");

	scr_height=sysinfo_value("fb.height");

	iospace_enable(task_get_id(),(void *)EGA_IO_ADDRESS,2);

	sz = scr_width*scr_height*2;

	scr_addr = as_get_mappable_page(sz);

	map_physmem(ega_ph_addr, scr_addr, ALIGN_UP(sz,PAGE_SIZE)>>PAGE_WIDTH,

		    AS_AREA_READ | AS_AREA_WRITE);

	async_set_client_connection(ega_client_connection);

	return 0;

}