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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;

}