ega.c

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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 <libarch/ddi.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

#define NORMAL_COLOR       0x0f
#define INVERTED_COLOR     0xf0

#define EGA_STYLE(fg,bg) ((fg) > (bg) ? NORMAL_COLOR : INVERTED_COLOR)

/* 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 = NORMAL_COLOR;

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)
{
        uint8_t 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)
{
        uint8_t 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;
                scr_addr[i*2+1] = EGA_STYLE(data[i].style.fg_color, data[i].style.bg_color);
        }
}

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 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);
                        style = EGA_STYLE(fgcolor, bgcolor);
                        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;

                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;
}

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