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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.

 */

/** @defgroup egafb EGA framebuffer

 * @brief	HelenOS EGA framebuffer.

 * @ingroup fbs

 * @{

 */ 

/** @file

 */

#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 <libarch/ddi.h>

#include <io/style.h>

#include <io/color.h>

#include <sys/types.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_BASE ((ioport8_t *) 0x3d4)

#define EGA_IO_SIZE 2

int ega_normal_color = 0x0f;

int ega_inverted_color = 0xf0;

#define NORMAL_COLOR		ega_normal_color

#define INVERTED_COLOR		ega_inverted_color

/* Allow only 1 connection */

static int client_connected = 0;

static unsigned int scr_width;

static unsigned int scr_height;

static uint8_t *scr_addr;

static unsigned int style;

static unsigned attr_to_ega_style(const attrs_t *a);

static uint8_t ega_glyph(wchar_t ch);

static void clrscr(void)

{

	unsigned 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 col, unsigned int row)

{

	int ega_cursor;

	ega_cursor = col + scr_width * row;

	pio_write_8(EGA_IO_BASE, 0xe);

	pio_write_8(EGA_IO_BASE + 1, (ega_cursor >> 8) & 0xff);

	pio_write_8(EGA_IO_BASE, 0xf);

	pio_write_8(EGA_IO_BASE + 1, ega_cursor & 0xff);

}

static void cursor_disable(void)

{

	uint8_t stat;

	pio_write_8(EGA_IO_BASE, 0xa);

	stat = pio_read_8(EGA_IO_BASE + 1);

	pio_write_8(EGA_IO_BASE, 0xa);

	pio_write_8(EGA_IO_BASE + 1, stat | (1 << 5));

}

static void cursor_enable(void)

{

	uint8_t stat;

	pio_write_8(EGA_IO_BASE, 0xa);

	stat = pio_read_8(EGA_IO_BASE + 1);

	pio_write_8(EGA_IO_BASE, 0xa);

	pio_write_8(EGA_IO_BASE + 1, stat & (~(1 << 5)));

}

static void scroll(int rows)

{

	unsigned i;

	if (rows > 0) {

		memmove(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) {

		memmove(((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(wchar_t c, unsigned int col, unsigned int row)

{

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

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

	cursor_goto(col + 1, row);

}

/** Draw text data to viewport.

 *

 * @param vport Viewport id

 * @param data  Text data.

 * @param x	Leftmost column of the area.

 * @param y	Topmost row of the area.

 * @param w	Number of rows.

 * @param h	Number of columns.

 */

static void draw_text_data(keyfield_t *data, unsigned int x,

    unsigned int y, unsigned int w, unsigned int h)

{

	unsigned int i, j;

	keyfield_t *field;

	uint8_t *dp;

	for (j = 0; j < h; j++) {

		for (i = 0; i < w; i++) {

			field = &data[j * w + i];

			dp = &scr_addr[2 * ((y + j) * scr_width + (x + i))];

			dp[0] = ega_glyph(field->character);

			dp[1] = attr_to_ega_style(&field->attrs);

		}

	}

}

static int save_screen(void)

{

	int i;

	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 int style_to_ega_style(int style)

{

	unsigned int ega_style;

	switch (style) {

	case STYLE_NORMAL:

		ega_style = INVERTED_COLOR;

		break;

	case STYLE_EMPHASIS:

		ega_style = INVERTED_COLOR | 4;

		break;

	default:

		return INVERTED_COLOR;

	}

	return ega_style;

}

static unsigned int color_to_ega_style(int fg_color, int bg_color, int attr)

{

	unsigned int style;

	style = (fg_color & 7) | ((bg_color & 7) << 4);

	if (attr & CATTR_BRIGHT)

		style = style | 0x08;

	return style;

}

static unsigned int rgb_to_ega_style(uint32_t fg, uint32_t bg)

{

	return (fg > bg) ? NORMAL_COLOR : INVERTED_COLOR;

}

static unsigned attr_to_ega_style(const attrs_t *a)

{

	switch (a->t) {

	case at_style:

		return style_to_ega_style(a->a.s.style);

	case at_rgb:

		return rgb_to_ega_style(a->a.r.fg_color, a->a.r.bg_color);

	case at_idx:

		return color_to_ega_style(a->a.i.fg_color,

		    a->a.i.bg_color, a->a.i.flags);

	default:

		return INVERTED_COLOR;

	}

}

static uint8_t ega_glyph(wchar_t ch)

{

	if (ch >= 0 && ch < 128)

		return ch;

	return '?';

}

static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

	int retval;

	ipc_callid_t callid;

	ipc_call_t call;

	wchar_t c;

	unsigned int row, col, w, h;

	int bg_color, fg_color, attr;

	uint32_t bg_rgb, fg_rgb;

	keyfield_t *interbuf = NULL;

	size_t intersize = 0;

	int i;

	if (client_connected) {

		ipc_answer_0(iid, ELIMIT);

		return;

	}

	client_connected = 1;

	ipc_answer_0(iid, EOK); /* Accept connection */

	while (1) {

		callid = async_get_call(&call);

 		switch (IPC_GET_METHOD(call)) {

		case IPC_M_PHONE_HUNGUP:

			client_connected = 0;

			ipc_answer_0(callid, EOK);

			return; /* Exit thread */

		case IPC_M_SHARE_OUT:

			/* 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:

			col = IPC_GET_ARG1(call);

			row = IPC_GET_ARG2(call);

			w = IPC_GET_ARG3(call);

			h = IPC_GET_ARG4(call);

			if (!interbuf) {

				retval = EINVAL;

				break;

			}

			if (col + w > scr_width || row + h > scr_height) {

				retval = EINVAL;

				break;

			}

			draw_text_data(interbuf, col, row, w, h);

			retval = 0;

			break;

		case FB_GET_CSIZE:

			ipc_answer_2(callid, EOK, scr_width, scr_height);

			continue;

		case FB_GET_COLOR_CAP:

			ipc_answer_1(callid, EOK, FB_CCAP_INDEXED);

			continue;

		case FB_CLEAR:

			clrscr();

			retval = 0;

			break;

		case FB_PUTCHAR:

			c = IPC_GET_ARG1(call);

			col = IPC_GET_ARG2(call);

			row = IPC_GET_ARG3(call);

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

				retval = EINVAL;

				break;

			}

			printchar(c, col, row);

			retval = 0;

			break;

 		case FB_CURSOR_GOTO:

 			col = IPC_GET_ARG1(call);

			row = IPC_GET_ARG2(call);

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

				retval = EINVAL;

				break;

			}

			cursor_goto(col, row);

 			retval = 0;

 			break;

		case FB_SCROLL:

			i = IPC_GET_ARG1(call);

			if (i > (int) 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:

			style = style_to_ega_style(IPC_GET_ARG1(call));

			retval = 0;

			break;

		case FB_SET_COLOR:

			fg_color = IPC_GET_ARG1(call);

			bg_color = IPC_GET_ARG2(call);

			attr = IPC_GET_ARG3(call);

			style = color_to_ega_style(fg_color, bg_color, attr);

			retval = 0;

			break;

		case FB_SET_RGB_COLOR:

			fg_rgb = IPC_GET_ARG1(call);

			bg_rgb = IPC_GET_ARG2(call);

			style = rgb_to_ega_style(fg_rgb, bg_rgb);

			retval = 0;

			break;

		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;

			}

			retval = 0;

			break;

		case FB_SCREEN_YIELD:

		case FB_SCREEN_RECLAIM:

			retval = EOK;

			break;

		default:

			retval = EINVAL;

		}

		ipc_answer_0(callid, retval);

	}

}

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");

	if (sysinfo_value("fb.blinking")) {

		ega_normal_color &= 0x77;

		ega_inverted_color &= 0x77;

	}

	style = NORMAL_COLOR;

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

	sz = scr_width * scr_height * 2;

	scr_addr = as_get_mappable_page(sz);

	if (physmem_map(ega_ph_addr, scr_addr, ALIGN_UP(sz, PAGE_SIZE) >>

	    PAGE_WIDTH, AS_AREA_READ | AS_AREA_WRITE) != 0)

		return -1;

	async_set_client_connection(ega_client_connection);

	return 0;

}

/**

 * @}

 */