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1493 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <align.h>
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#include <async.h>
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#include <ipc/ipc.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ddi.h>
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#include <sysinfo.h>
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#include <as.h>
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#include <ipc/fb.h>
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#include <ipc/ipc.h>
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#include <ipc/ns.h>
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#include <ipc/services.h>
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#include "ega.h"
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/* Allow only 1 connection */
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static int client_connected = 0;
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static unsigned int scr_width;
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static unsigned int scr_height;
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static char *scr_addr;
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static void clrscr(void)
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{
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    int i;
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    for (i=0; i < scr_width*scr_height; i++)
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        scr_addr[i*2] = ' ';
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}
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static void printchar(char c, unsigned int row, unsigned int col)
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{
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    scr_addr[(row*scr_width + col)*2] = c;
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}
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static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
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    int retval;
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    ipc_callid_t callid;
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    ipc_call_t call;
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    char c;
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    unsigned int row, col;
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    if (client_connected) {
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        ipc_answer_fast(iid, ELIMIT, 0,0);
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        return;
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    }
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    client_connected = 1;
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    ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */
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    while (1) {
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        callid = async_get_call(&call);
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        switch (IPC_GET_METHOD(call)) {
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        case IPC_M_PHONE_HUNGUP:
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            client_connected = 0;
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            ipc_answer_fast(callid,0,0,0);
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            return; /* Exit thread */
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        case FB_GET_CSIZE:
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            ipc_answer_fast(callid, 0, scr_width, scr_height);
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            continue;
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        case FB_CLEAR:
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            clrscr();
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            retval = 0;
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            break;
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        case FB_PUTCHAR:
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            c = IPC_GET_ARG1(call);
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            row = IPC_GET_ARG2(call);
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            col = IPC_GET_ARG3(call);
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            if (row >= scr_width || col >= scr_height) {
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                retval = EINVAL;
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                break;
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            }
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            printchar(c,row,col);
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            retval = 0;
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            break;
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        default:
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            retval = ENOENT;
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        }
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        ipc_answer_fast(callid,retval,0,0);
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    }
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}
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int ega_init(void)
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{
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    void *ega_ph_addr;
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    size_t sz;
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    ega_ph_addr=(void *)sysinfo_value("fb.address.physical");
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    scr_width=sysinfo_value("fb.width");
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    scr_height=sysinfo_value("fb.height");
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    sz = scr_width*scr_height*2;
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    scr_addr = as_get_mappable_page(sz);
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    map_physmem(ega_ph_addr, scr_addr, ALIGN_UP(sz,PAGE_SIZE)>>PAGE_WIDTH,
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            AS_AREA_READ | AS_AREA_WRITE);
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    async_set_client_connection(ega_client_connection);
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    clrscr();
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    return 0;
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}