source: mainline/uspace/srv/console/console.c@ 99272a3

/*
 * 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.
 */

/** @addtogroup console
 * @{
 */
/** @file
 */

#include <libc.h>
#include <fb.h>
#include <ipc/ipc.h>
#include <kbd.h>
#include <io/keycode.h>
#include <ipc/fb.h>
#include <ipc/services.h>
#include <errno.h>
#include <keybuffer.h>
#include <ipc/console.h>
#include <unistd.h>
#include <async.h>
#include <libadt/fifo.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <sysinfo.h>
#include <event.h>
#include <devmap.h>

#include "console.h"
#include "gcons.h"
#include "screenbuffer.h"

#define NAME  "console"

#define MAX_DEVICE_NAME  32

/** Phone to the keyboard driver. */
static int kbd_phone;

/** Information about framebuffer */
struct {
        int phone;      /**< Framebuffer phone */
        ipcarg_t cols;  /**< Framebuffer columns */
        ipcarg_t rows;  /**< Framebuffer rows */
} fb_info;

typedef struct {
        size_t index;             /**< Console index */
        size_t refcount;          /**< Connection reference count */
        dev_handle_t dev_handle;  /**< Device handle */
        keybuffer_t keybuffer;    /**< Buffer for incoming keys. */
        screenbuffer_t scr;       /**< Screenbuffer for saving screen
                                       contents and related settings. */
} console_t;

/** Array of data for virtual consoles */
static console_t consoles[CONSOLE_COUNT];

static console_t *active_console = &consoles[0];
static console_t *prev_console = &consoles[0];
static console_t *kernel_console = &consoles[KERNEL_CONSOLE];

/** Pointer to memory shared with framebufer used for
    faster virtual console switching */
static keyfield_t *interbuffer = NULL;

/** Information on row-span yet unsent to FB driver. */
struct {
        size_t col;  /**< Leftmost column of the span. */
        size_t row;  /**< Row where the span lies. */
        size_t cnt;  /**< Width of the span. */
} fb_pending;

/** Pending input structure. */
typedef struct {
        link_t link;
        console_t *cons;      /**< Console waiting for input */
        ipc_callid_t rid;     /**< Call ID waiting for input */
        ipc_callid_t callid;  /**< Call ID waiting for IPC_DATA_READ */
        
        size_t pos;           /**< Position of the last stored data */
        size_t size;          /**< Size of ther buffer */
        char *data;           /**< Already stored data */
} pending_input_t;

LIST_INITIALIZE(pending_input);

/** Process pending input requests */
static void process_pending_input(void)
{
        async_serialize_start();
        
        link_t *cur;
        
loop:
        for (cur = pending_input.next; cur != &pending_input; cur = cur->next) {
                pending_input_t *pr = list_get_instance(cur, pending_input_t, link);
                
                console_event_t ev;
                if (keybuffer_pop(&pr->cons->keybuffer, &ev)) {
                        
                        if (pr->data != NULL) {
                                if (ev.type == KEY_PRESS) {
                                        pr->data[pr->pos] = ev.c;
                                        pr->pos++;
                                }
                        } else {
                                ipc_answer_4(pr->rid, EOK, ev.type, ev.key, ev.mods, ev.c);
                                
                                list_remove(cur);
                                free(pr);
                                
                                goto loop;
                        }
                }
                
                if ((pr->data != NULL) && (pr->pos == pr->size)) {
                        (void) ipc_data_read_finalize(pr->callid, pr->data, pr->size);
                        ipc_answer_1(pr->rid, EOK, pr->size);
                        
                        free(pr->data);
                        list_remove(cur);
                        free(pr);
                        
                        goto loop;
                }
        }
        
        async_serialize_end();
}

static void curs_visibility(bool visible)
{
        async_msg_1(fb_info.phone, FB_CURSOR_VISIBILITY, visible); 
}

static void curs_hide_sync(void)
{
        ipc_call_sync_1_0(fb_info.phone, FB_CURSOR_VISIBILITY, false); 
}

static void curs_goto(size_t x, size_t y)
{
        async_msg_2(fb_info.phone, FB_CURSOR_GOTO, x, y);
}

static void screen_clear(void)
{
        async_msg_0(fb_info.phone, FB_CLEAR);
}

static void screen_yield(void)
{
        ipc_call_sync_0_0(fb_info.phone, FB_SCREEN_YIELD);
}

static void screen_reclaim(void)
{
        ipc_call_sync_0_0(fb_info.phone, FB_SCREEN_RECLAIM);
}

static void kbd_yield(void)
{
        ipc_call_sync_0_0(kbd_phone, KBD_YIELD);
}

static void kbd_reclaim(void)
{
        ipc_call_sync_0_0(kbd_phone, KBD_RECLAIM);
}

static void set_style(int style)
{
        async_msg_1(fb_info.phone, FB_SET_STYLE, style);
}

static void set_color(int fgcolor, int bgcolor, int flags)
{
        async_msg_3(fb_info.phone, FB_SET_COLOR, fgcolor, bgcolor, flags);
}

static void set_rgb_color(int fgcolor, int bgcolor)
{
        async_msg_2(fb_info.phone, FB_SET_RGB_COLOR, fgcolor, bgcolor); 
}

static void set_attrs(attrs_t *attrs)
{
        switch (attrs->t) {
        case at_style:
                set_style(attrs->a.s.style);
                break;
        case at_idx:
                set_color(attrs->a.i.fg_color, attrs->a.i.bg_color,
                    attrs->a.i.flags);
                break;
        case at_rgb:
                set_rgb_color(attrs->a.r.fg_color, attrs->a.r.bg_color);
                break;
        }
}

/** Send an area of screenbuffer to the FB driver. */
static void fb_update_area(console_t *cons, ipcarg_t x0, ipcarg_t y0, ipcarg_t width, ipcarg_t height)
{
        if (interbuffer) {
                ipcarg_t x;
                ipcarg_t y;
                
                for (y = 0; y < height; y++) {
                        for (x = 0; x < width; x++) {
                                interbuffer[y * width + x] =
                                    *get_field_at(&cons->scr, x0 + x, y0 + y);
                        }
                }
                
                async_req_4_0(fb_info.phone, FB_DRAW_TEXT_DATA,
                    x0, y0, width, height);
        }
}

/** Flush pending cells to FB. */
static void fb_pending_flush(void)
{
        if (fb_pending.cnt > 0) {
                fb_update_area(active_console, fb_pending.col,
                    fb_pending.row, fb_pending.cnt, 1);
                fb_pending.cnt = 0;
        }
}

/** Mark a character cell as changed.
 *
 * This adds the cell to the pending rowspan if possible. Otherwise
 * the old span is flushed first.
 *
 */
static void cell_mark_changed(size_t col, size_t row)
{
        if (fb_pending.cnt != 0) {
                if ((col != fb_pending.col + fb_pending.cnt)
                    || (row != fb_pending.row)) {
                        fb_pending_flush();
                }
        }
        
        if (fb_pending.cnt == 0) {
                fb_pending.col = col;
                fb_pending.row = row;
        }
        
        fb_pending.cnt++;
}

/** Print a character to the active VC with buffering. */
static void fb_putchar(wchar_t c, ipcarg_t col, ipcarg_t row)
{
        async_msg_3(fb_info.phone, FB_PUTCHAR, c, col, row);
}

/** Process a character from the client (TTY emulation). */
static void write_char(console_t *cons, wchar_t ch)
{
        switch (ch) {
        case '\n':
                fb_pending_flush();
                cons->scr.position_y++;
                cons->scr.position_x = 0;
                break;
        case '\r':
                break;
        case '\t':
                cons->scr.position_x += 8;
                cons->scr.position_x -= cons->scr.position_x % 8;
                break;
        case '\b':
                if (cons->scr.position_x == 0)
                        break;
                cons->scr.position_x--;
                if (cons == active_console)
                        cell_mark_changed(cons->scr.position_x, cons->scr.position_y);
                screenbuffer_putchar(&cons->scr, ' ');
                break;
        default:
                if (cons == active_console)
                        cell_mark_changed(cons->scr.position_x, cons->scr.position_y);
                
                screenbuffer_putchar(&cons->scr, ch);
                cons->scr.position_x++;
        }
        
        if (cons->scr.position_x >= cons->scr.size_x)
                cons->scr.position_y++;
        
        if (cons->scr.position_y >= cons->scr.size_y) {
                fb_pending_flush();
                cons->scr.position_y = cons->scr.size_y - 1;
                screenbuffer_clear_line(&cons->scr, cons->scr.top_line);
                cons->scr.top_line = (cons->scr.top_line + 1) % cons->scr.size_y;
                
                if (cons == active_console)
                        async_msg_1(fb_info.phone, FB_SCROLL, 1);
        }
        
        cons->scr.position_x = cons->scr.position_x % cons->scr.size_x;
}

/** Switch to new console */
static void change_console(console_t *cons)
{
        if (cons == active_console)
                return;
        
        fb_pending_flush();
        
        if (cons == kernel_console) {
                async_serialize_start();
                curs_hide_sync();
                gcons_in_kernel();
                screen_yield();
                kbd_yield();
                async_serialize_end();
                
                if (__SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE)) {
                        prev_console = active_console;
                        active_console = kernel_console;
                } else
                        cons = active_console;
        }
        
        if (cons != kernel_console) {
                size_t x;
                size_t y;
                int rc = 0;
                
                async_serialize_start();
                
                if (active_console == kernel_console) {
                        screen_reclaim();
                        kbd_reclaim();
                        gcons_redraw_console();
                }
                
                active_console = cons;
                gcons_change_console(cons->index);
                
                set_attrs(&cons->scr.attrs);
                curs_visibility(false);
                if (interbuffer) {
                        for (y = 0; y < cons->scr.size_y; y++) {
                                for (x = 0; x < cons->scr.size_x; x++) {
                                        interbuffer[y * cons->scr.size_x + x] =
                                            *get_field_at(&cons->scr, x, y);
                                }
                        }
                        
                        /* This call can preempt, but we are already at the end */
                        rc = async_req_4_0(fb_info.phone, FB_DRAW_TEXT_DATA,
                            0, 0, cons->scr.size_x,
                            cons->scr.size_y);
                }
                
                if ((!interbuffer) || (rc != 0)) {
                        set_attrs(&cons->scr.attrs);
                        screen_clear();
                        
                        for (y = 0; y < cons->scr.size_y; y++)
                                for (x = 0; x < cons->scr.size_x; x++) {
                                        keyfield_t *field = get_field_at(&cons->scr, x, y);
                                        
                                        if (!attrs_same(cons->scr.attrs, field->attrs))
                                                set_attrs(&field->attrs);
                                        
                                        cons->scr.attrs = field->attrs;
                                        if ((field->character == ' ') &&
                                            (attrs_same(field->attrs, cons->scr.attrs)))
                                                continue;
                                        
                                        fb_putchar(field->character, x, y);
                                }
                }
                
                curs_goto(cons->scr.position_x, cons->scr.position_y);
                curs_visibility(cons->scr.is_cursor_visible);
                
                async_serialize_end();
        }
}

/** Handler for keyboard */
static void keyboard_events(ipc_callid_t iid, ipc_call_t *icall)
{
        /* Ignore parameters, the connection is already opened */
        while (true) {
                
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                int retval;
                console_event_t ev;
                
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        /* TODO: Handle hangup */
                        return;
                case KBD_EVENT:
                        /* Got event from keyboard driver. */
                        retval = 0;
                        ev.type = IPC_GET_ARG1(call);
                        ev.key = IPC_GET_ARG2(call);
                        ev.mods = IPC_GET_ARG3(call);
                        ev.c = IPC_GET_ARG4(call);
                        
                        if ((ev.key >= KC_F1) && (ev.key < KC_F1 +
                            CONSOLE_COUNT) && ((ev.mods & KM_CTRL) == 0)) {
                                if (ev.key == KC_F1 + KERNEL_CONSOLE)
                                        change_console(kernel_console);
                                else
                                        change_console(&consoles[ev.key - KC_F1]);
                                break;
                        }
                        
                        keybuffer_push(&active_console->keybuffer, &ev);
                        break;
                default:
                        retval = ENOENT;
                }
                ipc_answer_0(callid, retval);
        }
}

static void cons_write(console_t *cons, ipc_callid_t rid, ipc_call_t *request)
{
        ipc_callid_t callid;
        size_t size;
        if (!ipc_data_write_receive(&callid, &size)) {
                ipc_answer_0(callid, EINVAL);
                ipc_answer_0(rid, EINVAL);
                return;
        }
        
        char *buf = (char *) malloc(size);
        if (buf == NULL) {
                ipc_answer_0(callid, ENOMEM);
                ipc_answer_0(rid, ENOMEM);
                return;
        }
        
        (void) ipc_data_write_finalize(callid, buf, size);
        
        async_serialize_start();
        
        size_t off = 0;
        while (off < size) {
                wchar_t ch = str_decode(buf, &off, size);
                write_char(cons, ch);
        }
        
        if (cons == active_console)
                curs_goto(cons->scr.position_x, cons->scr.position_y);
        
        async_serialize_end();
        
        gcons_notify_char(cons->index);
        ipc_answer_1(rid, EOK, size);
        
        free(buf);
}

static void cons_read(console_t *cons, ipc_callid_t rid, ipc_call_t *request)
{
        ipc_callid_t callid;
        size_t size;
        if (!ipc_data_read_receive(&callid, &size)) {
                ipc_answer_0(callid, EINVAL);
                ipc_answer_0(rid, EINVAL);
                return;
        }
        
        char *buf = (char *) malloc(size);
        if (buf == NULL) {
                ipc_answer_0(callid, ENOMEM);
                ipc_answer_0(rid, ENOMEM);
                return;
        }
        
        async_serialize_start();
        
        size_t pos = 0;
        console_event_t ev;
        while ((keybuffer_pop(&cons->keybuffer, &ev)) && (pos < size)) {
                if (ev.type == KEY_PRESS) {
                        buf[pos] = ev.c;
                        pos++;
                }
        }
        
        if (pos == size) {
                (void) ipc_data_read_finalize(callid, buf, size);
                ipc_answer_1(rid, EOK, size);
                free(buf);
        } else {
                pending_input_t *pr = (pending_input_t *) malloc(sizeof(pending_input_t));
                if (!pr) {
                        ipc_answer_0(rid, ENOMEM);
                        free(buf);
                        async_serialize_end();
                        return;
                }
                
                pr->cons = cons;
                pr->rid = rid;
                pr->callid = callid;
                pr->pos = pos;
                pr->size = size;
                pr->data = buf;
                list_append(&pr->link, &pending_input);
        }
        
        async_serialize_end();
}

static void cons_get_event(console_t *cons, ipc_callid_t rid, ipc_call_t *request)
{
        async_serialize_start();
        
        console_event_t ev;
        if (keybuffer_pop(&cons->keybuffer, &ev)) {
                ipc_answer_4(rid, EOK, ev.type, ev.key, ev.mods, ev.c);
        } else {
                pending_input_t *pr = (pending_input_t *) malloc(sizeof(pending_input_t));
                if (!pr) {
                        ipc_answer_0(rid, ENOMEM);
                        async_serialize_end();
                        return;
                }
                
                pr->cons = cons;
                pr->rid = rid;
                pr->callid = 0;
                pr->data = NULL;
                list_append(&pr->link, &pending_input);
        }
        
        async_serialize_end();
}

/** Default thread for new connections */
static void client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        console_t *cons = NULL;
        
        size_t i;
        for (i = 0; i < CONSOLE_COUNT; i++) {
                if (i == KERNEL_CONSOLE)
                        continue;
                
                if (consoles[i].dev_handle == (dev_handle_t) IPC_GET_ARG1(*icall)) {
                        cons = &consoles[i];
                        break;
                }
        }
        
        if (cons == NULL) {
                ipc_answer_0(iid, ENOENT);
                return;
        }
        
        ipc_callid_t callid;
        ipc_call_t call;
        ipcarg_t arg1;
        ipcarg_t arg2;
        ipcarg_t arg3;
        
        async_serialize_start();
        if (cons->refcount == 0)
                gcons_notify_connect(cons->index);
        
        cons->refcount++;
        
        /* Accept the connection */
        ipc_answer_0(iid, EOK);
        
        while (true) {
                async_serialize_end();
                callid = async_get_call(&call);
                async_serialize_start();
                
                arg1 = 0;
                arg2 = 0;
                arg3 = 0;
                
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        cons->refcount--;
                        if (cons->refcount == 0)
                                gcons_notify_disconnect(cons->index);
                        return;
                case VFS_READ:
                        async_serialize_end();
                        cons_read(cons, callid, &call);
                        async_serialize_start();
                        continue;
                case VFS_WRITE:
                        async_serialize_end();
                        cons_write(cons, callid, &call);
                        async_serialize_start();
                        continue;
                case VFS_SYNC:
                        fb_pending_flush();
                        if (cons == active_console) {
                                async_req_0_0(fb_info.phone, FB_FLUSH);
                                
                                curs_goto(cons->scr.position_x, cons->scr.position_y);
                        }
                        break;
                case CONSOLE_CLEAR:
                        /* Send message to fb */
                        if (cons == active_console)
                                async_msg_0(fb_info.phone, FB_CLEAR);
                        
                        screenbuffer_clear(&cons->scr);
                        
                        break;
                case CONSOLE_GOTO:
                        screenbuffer_goto(&cons->scr,
                            IPC_GET_ARG1(call), IPC_GET_ARG2(call));
                        if (cons == active_console)
                                curs_goto(IPC_GET_ARG1(call),
                                    IPC_GET_ARG2(call));
                        break;
                case CONSOLE_GET_SIZE:
                        arg1 = fb_info.cols;
                        arg2 = fb_info.rows;
                        break;
                case CONSOLE_SET_STYLE:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        screenbuffer_set_style(&cons->scr, arg1);
                        if (cons == active_console)
                                set_style(arg1);
                        break;
                case CONSOLE_SET_COLOR:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        arg2 = IPC_GET_ARG2(call);
                        arg3 = IPC_GET_ARG3(call);
                        screenbuffer_set_color(&cons->scr, arg1, arg2, arg3);
                        if (cons == active_console)
                                set_color(arg1, arg2, arg3);
                        break;
                case CONSOLE_SET_RGB_COLOR:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        arg2 = IPC_GET_ARG2(call);
                        screenbuffer_set_rgb_color(&cons->scr, arg1, arg2);
                        if (cons == active_console)
                                set_rgb_color(arg1, arg2);
                        break;
                case CONSOLE_CURSOR_VISIBILITY:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        cons->scr.is_cursor_visible = arg1;
                        if (cons == active_console)
                                curs_visibility(arg1);
                        break;
                case CONSOLE_GET_EVENT:
                        async_serialize_end();
                        cons_get_event(cons, callid, &call);
                        async_serialize_start();
                        continue;
                case CONSOLE_KCON_ENABLE:
                        change_console(kernel_console);
                        break;
                }
                ipc_answer_3(callid, EOK, arg1, arg2, arg3);
        }
}

static void interrupt_received(ipc_callid_t callid, ipc_call_t *call)
{
        change_console(prev_console);
}

static bool console_init(void)
{
        /* Connect to keyboard driver */
        
        kbd_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_KEYBOARD, 0, 0);
        if (kbd_phone < 0) {
                printf(NAME ": Failed to connect to keyboard service\n");
                return false;
        }
        
        ipcarg_t phonehash;
        if (ipc_connect_to_me(kbd_phone, SERVICE_CONSOLE, 0, 0, &phonehash) != 0) {
                printf(NAME ": Failed to create callback from keyboard service\n");
                return false;
        }
        
        async_set_pending(process_pending_input);
        async_new_connection(phonehash, 0, NULL, keyboard_events);
        
        /* Connect to framebuffer driver */
        fb_info.phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VIDEO, 0, 0);
        if (fb_info.phone < 0) {
                printf(NAME ": Failed to connect to video service\n");
                return -1;
        }
        
        /* Register driver */
        int rc = devmap_driver_register(NAME, client_connection);
        if (rc < 0) {
                printf(NAME ": Unable to register driver (%d)\n", rc);
                return false;
        }
        
        /* Initialize gcons */
        gcons_init(fb_info.phone);
        
        /* Synchronize, the gcons could put something in queue */
        async_req_0_0(fb_info.phone, FB_FLUSH);
        async_req_0_2(fb_info.phone, FB_GET_CSIZE, &fb_info.cols, &fb_info.rows);
        
        /* Set up shared memory buffer. */
        size_t ib_size = sizeof(keyfield_t) * fb_info.cols * fb_info.rows;
        interbuffer = as_get_mappable_page(ib_size);
        
        if (as_area_create(interbuffer, ib_size, AS_AREA_READ |
            AS_AREA_WRITE | AS_AREA_CACHEABLE) != interbuffer)
                interbuffer = NULL;
        
        if (interbuffer) {
                if (ipc_share_out_start(fb_info.phone, interbuffer,
                    AS_AREA_READ) != EOK) {
                        as_area_destroy(interbuffer);
                        interbuffer = NULL;
                }
        }
        
        fb_pending.cnt = 0;
        
        /* Inititalize consoles */
        size_t i;
        for (i = 0; i < CONSOLE_COUNT; i++) {
                if (i != KERNEL_CONSOLE) {
                        if (screenbuffer_init(&consoles[i].scr,
                            fb_info.cols, fb_info.rows) == NULL) {
                                printf(NAME ": Unable to allocate screen buffer %u\n", i);
                                return false;
                        }
                        screenbuffer_clear(&consoles[i].scr);
                        keybuffer_init(&consoles[i].keybuffer);
                        consoles[i].index = i;
                        consoles[i].refcount = 0;
                        
                        char vc[MAX_DEVICE_NAME];
                        snprintf(vc, MAX_DEVICE_NAME, "vc%u", i);
                        
                        if (devmap_device_register(vc, &consoles[i].dev_handle) != EOK) {
                                devmap_hangup_phone(DEVMAP_DRIVER);
                                printf(NAME ": Unable to register device %s\n", vc);
                                return false;
                        }
                }
        }
        
        /* Initialize the screen */
        set_rgb_color(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);
        screen_clear();
        curs_goto(0, 0);
        curs_visibility(active_console->scr.is_cursor_visible);
        
        /* Receive kernel notifications */
        if (event_subscribe(EVENT_KCONSOLE, 0) != EOK)
                printf(NAME ": Error registering kconsole notifications\n");
        
        async_set_interrupt_received(interrupt_received);
        
        return true;
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS Console service\n");
        
        /* Disable kernel output to the console */
        __SYSCALL0(SYS_DEBUG_DISABLE_CONSOLE);
        
        if (!console_init()) {
                __SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE);
                return -1;
        }
        
        printf(NAME ": Accepting connections\n");
        async_manager();
        
        return 0;
}

/** @}
 */