source: mainline/console/console.c@ c1d2c9d

/*
 * Copyright (C) 2006 Josef Cejka
 * 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 <kbd.h>
#include <fb.h>
#include <ipc/ipc.h>
#include <ipc/fb.h>
#include <ipc/services.h>
#include <errno.h>
#include <key_buffer.h>
#include <console.h>
#include <unistd.h>
#include <async.h>
#include <libadt/fifo.h>
#include <screenbuffer.h>

#define CONSOLE_COUNT 8
#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "CONSOLE"

int active_console = 1;

struct {
        int phone;              /**< Framebuffer phone */
        int rows;               /**< Framebuffer rows */
        int cols;               /**< Framebuffer columns */
} fb_info;

typedef struct {
        keybuffer_t keybuffer;
        FIFO_CREATE_STATIC(keyrequests, ipc_callid_t , MAX_KEYREQUESTS_BUFFERED);
        int keyrequest_counter;
        int client_phone;
        int used;
        screenbuffer_t screenbuffer;
} connection_t;

connection_t connections[CONSOLE_COUNT];

static int find_free_connection() 
{
        int i = 0;
        
        while (i < CONSOLE_COUNT) {
                if (connections[i].used == 0)
                        return i;
                ++i;
        }
        return CONSOLE_COUNT;
}


static int find_connection(int client_phone) 
{
        int i = 0;
        
        while (i < CONSOLE_COUNT) {
                if (connections[i].client_phone == client_phone)
                        return i;
                ++i;
        }
        return  CONSOLE_COUNT;
}

/* Handler for keyboard */
static void keyboard_events(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int retval;
        int i, j;
        char c,d;
        connection_t *conn;

        /* Ignore parameters, the connection is alread opened */
        while (1) {
                callid = async_get_call(&call);
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        ipc_answer_fast(callid,0,0,0);
                        /* TODO: Handle hangup */
                        return;
                case KBD_PUSHCHAR:
                        /* got key from keyboard driver */
                        
                        retval = 0;
                        c = IPC_GET_ARG1(call);
                        /* switch to another virtual console */
                        
                        conn = &connections[active_console];
                        if ((c >= KBD_KEY_F1) && (c < KBD_KEY_F1 + CONSOLE_COUNT)) {
                                /*FIXME: draw another console content from buffer */

                                active_console = c - KBD_KEY_F1;
                                conn = &connections[active_console];

                                ipc_call_async(fb_info.phone, FB_CURSOR_VISIBILITY, 0, NULL, NULL); 
                                ipc_call_async_2(fb_info.phone, FB_CLEAR, 0, 0, NULL, NULL);
                                for (i = 0; i < conn->screenbuffer.size_x; i++)
                                        for (j = 0; j < conn->screenbuffer.size_y; j++) {
                                                d = get_field_at(&(conn->screenbuffer),i, j)->character;
                                                if (d && d != ' ')
                                                        ipc_call_async_3(fb_info.phone, FB_PUTCHAR, d, j, i, NULL, NULL);
                                        }
                                ipc_call_async_2(fb_info.phone, FB_CURSOR_GOTO, conn->screenbuffer.position_y, conn->screenbuffer.position_x, NULL, NULL); 
                                ipc_call_async(fb_info.phone, FB_CURSOR_VISIBILITY, 1, NULL, NULL); 

                                break;
                        }
                        
                        /* if client is awaiting key, send it */
                        if (conn->keyrequest_counter > 0) {             
                                conn->keyrequest_counter--;
                                ipc_answer_fast(fifo_pop(conn->keyrequests), 0, c, 0);
                                break;
                        }
                        
                        /*FIXME: else store key to its buffer */
                        keybuffer_push(&conn->keybuffer, c);
                        
                        break;
                default:
                        retval = ENOENT;
                }               
                ipc_answer_fast(callid, retval, 0, 0);
        }
}

/** Default thread for new connections */
void client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int consnum;
        ipcarg_t arg1;

        if ((consnum = find_free_connection()) == CONSOLE_COUNT) {
                ipc_answer_fast(iid,ELIMIT,0,0);
                return;
        }
        
        connections[consnum].used = 1;
        connections[consnum].client_phone = IPC_GET_ARG3(call);
        screenbuffer_clear(&(connections[consnum].screenbuffer));

        /* Accept the connection */
        ipc_answer_fast(iid,0,0,0);
        
        while (1) {
                callid = async_get_call(&call);
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        /* TODO */
                        ipc_answer_fast(callid, 0,0,0);
                        return;
                case CONSOLE_PUTCHAR:
                        
                        /* Send message to fb */
                        if (consnum == active_console) {
                                ipc_call_async_3(fb_info.phone, FB_PUTCHAR, IPC_GET_ARG2(call), connections[consnum].screenbuffer.position_y, \
                                                connections[consnum].screenbuffer.position_x, NULL, NULL); 
                        }
                        
                        screenbuffer_putchar(&(connections[consnum].screenbuffer), IPC_GET_ARG2(call));
                        break;
                case CONSOLE_CLEAR:
                        /* Send message to fb */
                        if (consnum == active_console) {
                                ipc_call_async_2(fb_info.phone, FB_CLEAR, 0, 0, NULL, NULL); 
                        }
                        
                        screenbuffer_clear(&(connections[consnum].screenbuffer));
                        
                        break;
                case CONSOLE_GOTO:
                        
                        screenbuffer_goto(&(connections[consnum].screenbuffer), IPC_GET_ARG1(call), IPC_GET_ARG2(call));
                        
                        break;

                case CONSOLE_GETCHAR:
                        if (keybuffer_empty(&(connections[consnum].keybuffer))) {
                                /* buffer is empty -> store request */
                                if (connections[consnum].keyrequest_counter < MAX_KEYREQUESTS_BUFFERED) {               
                                        fifo_push(connections[consnum].keyrequests, callid);
                                        connections[consnum].keyrequest_counter++;
                                } else {
                                        /* no key available and too many requests => fail */
                                        ipc_answer_fast(callid, ELIMIT, 0, 0);
                                }
                                continue;
                        };
                        keybuffer_pop(&(connections[consnum].keybuffer), (char *)&arg1);
                        
                        break;
                }
                ipc_answer_fast(callid, 0, arg1, 0);
        }
}

int main(int argc, char *argv[])
{
        ipcarg_t phonehash;
        int kbd_phone, fb_phone;
        ipcarg_t retval, arg1 = 0xdead, arg2 = 0xbeef;
        int i;
        
        /* Connect to keyboard driver */

        while ((kbd_phone = ipc_connect_me_to(PHONE_NS, SERVICE_KEYBOARD, 0)) < 0) {
                usleep(10000);
        };
        
        if (ipc_connect_to_me(kbd_phone, SERVICE_CONSOLE, 0, &phonehash) != 0) {
                return -1;
        };
        async_new_connection(phonehash, 0, NULL, keyboard_events);

        /* Connect to framebuffer driver */
        
        while ((fb_info.phone = ipc_connect_me_to(PHONE_NS, SERVICE_VIDEO, 0)) < 0) {
                usleep(10000);
        }
        
        ipc_call_sync_2(fb_info.phone, FB_GET_CSIZE, 0, 0, &(fb_info.rows), &(fb_info.cols)); 
        ipc_call_sync(fb_info.phone, FB_CURSOR_VISIBILITY, 1, NULL); 
        
        /* Init virtual consoles */
        for (i = 0; i < CONSOLE_COUNT; i++) {
                connections[i].used = 0;
                keybuffer_init(&(connections[i].keybuffer));
                
                connections[i].keyrequests.head = connections[i].keyrequests.tail = 0;
                connections[i].keyrequests.items = MAX_KEYREQUESTS_BUFFERED;
                connections[i].keyrequest_counter = 0;
                
                if (screenbuffer_init(&(connections[i].screenbuffer), fb_info.cols, fb_info.rows ) == NULL) {
                        /*FIXME: handle error */
                        return -1;
                }
        }
        
        if (ipc_connect_to_me(PHONE_NS, SERVICE_CONSOLE, 0, &phonehash) != 0) {
                return -1;
        };
        
        async_manager();

        return 0;       
}