source: mainline/uspace/console/console.c@ df496c5

/*
 * 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
 */

/* TODO: remove */
#include <stdio.h>

#include <fb.h>
#include <ipc/ipc.h>
#include <keys.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>
#include <sys/mman.h>

#include "gcons.h"

#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "CONSOLE"

/** Index of currently used virtual console.
 */
int active_console = 0;

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


typedef struct {
        keybuffer_t keybuffer;          /**< Buffer for incoming keys. */
        /** Buffer for unsatisfied request for keys. */
        FIFO_CREATE_STATIC(keyrequests, ipc_callid_t,
                MAX_KEYREQUESTS_BUFFERED);      
        int keyrequest_counter;         /**< Number of requests in buffer. */
        int client_phone;               /**< Phone to connected client. */
        int used;                       /**< 1 if this virtual console is
                                         * connected to some client.*/
        screenbuffer_t screenbuffer;    /**< Screenbuffer for saving screen
                                         * contents and related settings. */
} connection_t;

static connection_t connections[CONSOLE_COUNT]; /**< Array of data for virtual
                                                 * consoles */
static keyfield_t *interbuffer = NULL;          /**< Pointer to memory shared
                                                 * with framebufer used for
                                                 * faster virtual console
                                                 *switching */

static int kernel_pixmap = -1;  /**< Number of fb pixmap, where kernel
                                 * console is stored */


/** Find unused virtual console.
 *
 */
static int find_free_connection(void) 
{
        int i = 0;
        
        for (i=0; i < CONSOLE_COUNT; i++) {
                if (!connections[i].used)
                        return i;
        }
        return -1;
}

static void clrscr(void)
{
        async_msg(fb_info.phone, FB_CLEAR, 0);
}

static void curs_visibility(int v)
{
        async_msg(fb_info.phone, FB_CURSOR_VISIBILITY, v); 
}

static void curs_goto(int row, int col)
{
        async_msg_2(fb_info.phone, FB_CURSOR_GOTO, row, col); 
        
}

static void set_style(style_t *style)
{
        async_msg_2(fb_info.phone, FB_SET_STYLE, style->fg_color,
                style->bg_color); 
}

static void set_style_col(int fgcolor, int bgcolor)
{
        async_msg_2(fb_info.phone, FB_SET_STYLE, fgcolor, bgcolor); 
}

static void prtchr(char c, int row, int col)
{
        async_msg_3(fb_info.phone, FB_PUTCHAR, c, row, col);
        
}

/** Check key and process special keys. 
 *
 * */
static void write_char(int console, char key)
{
        screenbuffer_t *scr = &(connections[console].screenbuffer);
        
        switch (key) {
        case '\n':
                scr->position_y += 1;
                scr->position_x =  0;
                break;
        case '\r':
                break;
        case '\t':
                scr->position_x += 8;
                scr->position_x -= scr->position_x % 8; 
                break;
        case '\b':
                if (scr->position_x == 0) 
                        break;
                scr->position_x--;
                if (console == active_console)
                        prtchr(' ', scr->position_y, scr->position_x);
                screenbuffer_putchar(scr, ' ');
                break;
        default:        
                if (console == active_console)
                        prtchr(key, scr->position_y, scr->position_x);

                screenbuffer_putchar(scr, key);
                scr->position_x++;
        }
        
        scr->position_y += (scr->position_x >= scr->size_x);
        
        if (scr->position_y >= scr->size_y) {
                scr->position_y = scr->size_y - 1;
                screenbuffer_clear_line(scr, scr->top_line);
                scr->top_line = (scr->top_line+1) % scr->size_y;
                if (console == active_console)
                        async_msg(fb_info.phone, FB_SCROLL, 1);
        }
        
        scr->position_x = scr->position_x % scr->size_x;
        
        if (console == active_console)
                curs_goto(scr->position_y, scr->position_x);
        
}

/** Save current screen to pixmap, draw old pixmap
 *
 * @param oldpixmap Old pixmap
 * @return ID of pixmap of current screen
 */
static int switch_screens(int oldpixmap)
{
        int newpmap;
       
        /* Save screen */
        newpmap = async_req(fb_info.phone, FB_VP2PIXMAP, 0, NULL);
        if (newpmap < 0)
                return -1;

        if (oldpixmap != -1) {
                /* Show old screen */
                async_msg_2(fb_info.phone, FB_VP_DRAW_PIXMAP, 0, oldpixmap);
                /* Drop old pixmap */
                async_msg(fb_info.phone, FB_DROP_PIXMAP, oldpixmap);
        }
        
        return newpmap;
}

/** Switch to new console */
static void change_console(int newcons)
{
        connection_t *conn;
        static int console_pixmap = -1;
        int i, j, rc;
        keyfield_t *field;
        style_t *style;

        if (newcons == active_console)
                return;

        if (newcons == KERNEL_CONSOLE) {
                if (active_console == KERNEL_CONSOLE)
                        return;
                active_console = KERNEL_CONSOLE;
                curs_visibility(0);

                async_serialize_start();
                if (kernel_pixmap == -1) { 
                        /* store/restore unsupported */
                        set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);
                        clrscr();
                } else {
                        gcons_in_kernel();
                        console_pixmap = switch_screens(kernel_pixmap);
                        kernel_pixmap = -1;
                }
                async_serialize_end();

                __SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE);
                return;
        } 
        
        async_serialize_start();

        if (console_pixmap != -1) {
                kernel_pixmap = switch_screens(console_pixmap);
                console_pixmap = -1;
        }
        active_console = newcons;
        gcons_change_console(newcons);
        conn = &connections[active_console];

        set_style(&conn->screenbuffer.style);
        curs_visibility(0);
        if (interbuffer) {
                for (i = 0; i < conn->screenbuffer.size_x; i++)
                        for (j = 0; j < conn->screenbuffer.size_y; j++) 
                                interbuffer[i + j * conn->screenbuffer.size_x]
                                        = *get_field_at(&(conn->screenbuffer),
                                        i, j);
                /* This call can preempt, but we are already at the end */
                rc = async_req_2(fb_info.phone, FB_DRAW_TEXT_DATA, 0, 0, NULL,
                        NULL);          
        };
        
        if ((!interbuffer) || (rc != 0)) {
                set_style(&conn->screenbuffer.style);
                clrscr();
                style = &conn->screenbuffer.style;

                for (j = 0; j < conn->screenbuffer.size_y; j++) 
                        for (i = 0; i < conn->screenbuffer.size_x; i++) {
                                field = get_field_at(&(conn->screenbuffer), i,
                                        j);
                                if (!style_same(*style, field->style))
                                        set_style(&field->style);
                                style = &field->style;
                                if ((field->character == ' ') &&
                                        (style_same(field->style,
                                        conn->screenbuffer.style)))
                                        continue;

                                prtchr(field->character, j, i);
                        }
        }
        
        curs_goto(conn->screenbuffer.position_y,
                conn->screenbuffer.position_x);
        curs_visibility(conn->screenbuffer.is_cursor_visible);

        async_serialize_end();
}

/** 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 c;
        connection_t *conn;
        int newcon;
        
        /* Ignore parameters, the connection is alread opened */
        while (1) {
                callid = async_get_call(&call);
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        /* TODO: Handle hangup */
                        return;
                case KBD_MS_LEFT:
                        newcon = gcons_mouse_btn(IPC_GET_ARG1(call));
                        if (newcon != -1)
                                change_console(newcon);
                        retval = 0;
                        break;
                case KBD_MS_MOVE:
                        gcons_mouse_move(IPC_GET_ARG1(call),
                                IPC_GET_ARG2(call));
                        retval = 0;
                        break;
                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)) {
 */
                        if ((c >= 0x101) && (c < 0x101 + CONSOLE_COUNT)) {
                                if (c == 0x112)
                                        change_console(KERNEL_CONSOLE);
                                else
                                        change_console(c - 0x101);
                                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;
                        }
                        
                        keybuffer_push(&conn->keybuffer, c);
                        retval = 0;
                        
                        break;
                default:
                        retval = ENOENT;
                }
                ipc_answer_fast(callid, retval, 0, 0);
        }
}

/** Default thread for new connections */
static void client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int consnum;
        ipcarg_t arg1, arg2;
        connection_t *conn;

        if ((consnum = find_free_connection()) == -1) {
                ipc_answer_fast(iid,ELIMIT,0,0);
                return;
        }
        conn = &connections[consnum];
        conn->used = 1;
        
        async_serialize_start();
        gcons_notify_connect(consnum);
        conn->client_phone = IPC_GET_ARG3(call);
        screenbuffer_clear(&conn->screenbuffer);
        
        /* Accept the connection */
        ipc_answer_fast(iid,0,0,0);

        while (1) {
                async_serialize_end();
                callid = async_get_call(&call);
                async_serialize_start();

                arg1 = arg2 = 0;
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        gcons_notify_disconnect(consnum);
                        
                        /* Answer all pending requests */
                        while (conn->keyrequest_counter > 0) {          
                                conn->keyrequest_counter--;
                                ipc_answer_fast(fifo_pop(conn->keyrequests),
                                        ENOENT, 0, 0);
                                break;
                        }
                        conn->used = 0;
                        return;
                case CONSOLE_PUTCHAR:
                        write_char(consnum, IPC_GET_ARG1(call));
                        gcons_notify_char(consnum);
                        break;
                case CONSOLE_CLEAR:
                        /* Send message to fb */
                        if (consnum == active_console) {
                                async_msg(fb_info.phone, FB_CLEAR, 0); 
                        }
                        
                        screenbuffer_clear(&conn->screenbuffer);
                        
                        break;
                case CONSOLE_GOTO:
                        screenbuffer_goto(&conn->screenbuffer,
                                IPC_GET_ARG2(call), IPC_GET_ARG1(call));
                        if (consnum == active_console)
                                curs_goto(IPC_GET_ARG1(call),
                                        IPC_GET_ARG2(call));
                        break;
                case CONSOLE_GETSIZE:
                        arg1 = fb_info.rows;
                        arg2 = fb_info.cols;
                        break;
                case CONSOLE_FLUSH:
                        if (consnum == active_console)
                                async_req_2(fb_info.phone, FB_FLUSH, 0, 0,
                                        NULL, NULL);            
                        break;
                case CONSOLE_SET_STYLE:
                        arg1 = IPC_GET_ARG1(call);
                        arg2 = IPC_GET_ARG2(call);
                        screenbuffer_set_style(&conn->screenbuffer,arg1, arg2);
                        if (consnum == active_console)
                                set_style_col(arg1, arg2);
                        break;
                case CONSOLE_CURSOR_VISIBILITY:
                        arg1 = IPC_GET_ARG1(call);
                        conn->screenbuffer.is_cursor_visible = arg1;
                        if (consnum == active_console)
                                curs_visibility(arg1);
                        break;
                case CONSOLE_GETCHAR:
                        if (keybuffer_empty(&conn->keybuffer)) {
                                /* buffer is empty -> store request */
                                if (conn->keyrequest_counter <
                                        MAX_KEYREQUESTS_BUFFERED) {     
                                        fifo_push(conn->keyrequests, callid);
                                        conn->keyrequest_counter++;
                                } else {
                                        /*
                                         * No key available and too many
                                         * requests => fail.
                                        */
                                        ipc_answer_fast(callid, ELIMIT, 0, 0);
                                }
                                continue;
                        }
                        keybuffer_pop(&conn->keybuffer, (int *) &arg1);
                        break;
                }
                ipc_answer_fast(callid, 0, arg1, arg2);
        }
}

int main(int argc, char *argv[])
{
        ipcarg_t phonehash;
        int kbd_phone;
        int i;

        async_set_client_connection(client_connection);
        
        /* 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);
        }
        
        /* Save old kernel screen */
        kernel_pixmap = switch_screens(-1);

        /* Initialize gcons */
        gcons_init(fb_info.phone);
        /* Synchronize, the gcons can have something in queue */
        async_req(fb_info.phone, FB_FLUSH, 0, NULL);
        /* Enable double buffering */
        async_msg_2(fb_info.phone, FB_VIEWPORT_DB, (sysarg_t)-1, 1);
        
        async_req_2(fb_info.phone, FB_GET_CSIZE, 0, 0, &(fb_info.rows),
                &(fb_info.cols)); 
        set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);
        clrscr();
        
        /* 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;
                }
        }
        connections[KERNEL_CONSOLE].used = 1;
        
        if ((interbuffer = mmap(NULL, sizeof(keyfield_t) * fb_info.cols *
                fb_info.rows, PROTO_READ | PROTO_WRITE, MAP_ANONYMOUS |
                MAP_PRIVATE, 0, 0)) != NULL) {
                if (async_req_3(fb_info.phone, IPC_M_AS_AREA_SEND, (ipcarg_t)
                        interbuffer, 0, AS_AREA_READ, NULL, NULL, NULL) != 0) {
                        munmap(interbuffer, sizeof(keyfield_t) * fb_info.cols
                                * fb_info.rows);
                        interbuffer = NULL;
                }
        }

        curs_goto(0,0);
        curs_visibility(connections[active_console].screenbuffer.is_cursor_visible);

        /* Register at NS */
        if (ipc_connect_to_me(PHONE_NS, SERVICE_CONSOLE, 0, &phonehash) != 0) {
                return -1;
        }
        
        async_manager();

        return 0;       
}
 
/** @}
 */