source: mainline/fb/ega.c@ 83b1d61

/*
 * 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 <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"

/* Allow only 1 connection */
static int client_connected = 0;

static unsigned int scr_width;
static unsigned int scr_height;
static char *scr_addr;

static void clrscr(void)
{
        int i;
        
        for (i=0; i < scr_width*scr_height; i++)
                scr_addr[i*2] = ' ';
}

static void printchar(char c, unsigned int row, unsigned int col)
{
        scr_addr[(row*scr_width + col)*2] = c;
}

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;

        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 FB_GET_CSIZE:
                        ipc_answer_fast(callid, 0, scr_width, scr_height);
                        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 (row >= scr_width || col >= scr_height) {
                                retval = EINVAL;
                                break;
                        }
                        printchar(c,row,col);
                        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");

        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);

        clrscr();

        return 0;
}