source: mainline/uspace/srv/console/console.c@ ebfabf6

/*
 * 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 <kbd/keycode.h>
#include <ipc/fb.h>
#include <ipc/services.h>
#include <errno.h>
#include <key_buffer.h>
#include <ipc/console.h>
#include <unistd.h>
#include <async.h>
#include <libadt/fifo.h>
#include <screenbuffer.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <sysinfo.h>
#include <event.h>

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

#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "console"

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

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

/** Size of cwrite_buf. */
#define CWRITE_BUF_SIZE 256

/** Buffer for receiving data via the CONSOLE_WRITE call from the client. */
static char cwrite_buf[CWRITE_BUF_SIZE];

static void fb_putchar(wchar_t c, int row, int col);


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

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

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

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 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(connection_t *conn, int x, int y, int w, int h)
{
        int i, j;
        int rc;
        attrs_t *attrs;
        keyfield_t *field;

        if (interbuffer) {
                for (j = 0; j < h; j++) {
                        for (i = 0; i < w; i++) {
                                interbuffer[i + j * w] =
                                    *get_field_at(&conn->screenbuffer,
                                        x + i, y + j);
                        }
                }

                rc = async_req_4_0(fb_info.phone, FB_DRAW_TEXT_DATA,
                    x, y, w, h);
        } else {
                rc = ENOTSUP;
        }

        if (rc != 0) {
                /*
                attrs = &conn->screenbuffer.attrs;

                for (j = 0; j < h; j++) {
                        for (i = 0; i < w; i++) {
                                field = get_field_at(&conn->screenbuffer,
                                    x + i, y + j);
                                if (!attrs_same(*attrs, field->attrs))
                                        set_attrs(&field->attrs);
                                attrs = &field->attrs;

                                fb_putchar(field->character, y + j, x + i);
                        }
                }*/
        }
}

/** Flush pending cells to FB. */
static void fb_pending_flush(void)
{
        screenbuffer_t *scr;

        scr = &(connections[active_console].screenbuffer);

        if (fb_pending.n > 0) {
                fb_update_area(&connections[active_console], fb_pending.col,
                    fb_pending.row, fb_pending.n, 1);
                fb_pending.n = 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(int row, int col)
{
        if (fb_pending.n != 0) {
                if (row != fb_pending.row ||
                    col != fb_pending.col + fb_pending.n) {
                        fb_pending_flush();
                }
        }

        if (fb_pending.n == 0) {
                fb_pending.row = row;
                fb_pending.col = col;
        }

        ++fb_pending.n;
}


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

/** Process a character from the client (TTY emulation). */
static void write_char(int console, wchar_t ch)
{
        bool flush_cursor = false;
        screenbuffer_t *scr = &(connections[console].screenbuffer);

        switch (ch) {
        case '\n':
                fb_pending_flush();
                flush_cursor = true;
                scr->position_y++;
                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)
                        cell_mark_changed(scr->position_y, scr->position_x);
                screenbuffer_putchar(scr, ' ');
                break;
        default:        
                if (console == active_console)
                        cell_mark_changed(scr->position_y, scr->position_x);

                screenbuffer_putchar(scr, ch);
                scr->position_x++;
        }

        if (scr->position_x >= scr->size_x) {
                flush_cursor = true;
                scr->position_y++;
        }
        
        if (scr->position_y >= scr->size_y) {
                fb_pending_flush();
                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_1(fb_info.phone, FB_SCROLL, 1);
        }

        scr->position_x = scr->position_x % scr->size_x;

        if (console == active_console && flush_cursor)
                curs_goto(scr->position_y, scr->position_x);
}

/** Switch to new console */
static void change_console(int newcons)
{
        connection_t *conn;
        int i, j, rc;
        keyfield_t *field;
        attrs_t *attrs;
        
        if (newcons == active_console)
                return;

        fb_pending_flush();

        if (newcons == KERNEL_CONSOLE) {
                async_serialize_start();
                curs_hide_sync();
                gcons_in_kernel();
                screen_yield();
                async_serialize_end();

                
                if (__SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE)) {
                        prev_console = active_console;
                        active_console = KERNEL_CONSOLE;
                } else
                        newcons = active_console;
        }
        
        if (newcons != KERNEL_CONSOLE) {
                async_serialize_start();
                
                if (active_console == KERNEL_CONSOLE) {
                        screen_reclaim();
                        gcons_redraw_console();
                }
                
                active_console = newcons;
                gcons_change_console(newcons);
                conn = &connections[active_console];
                
                set_attrs(&conn->screenbuffer.attrs);
                curs_visibility(false);
                if (interbuffer) {
                        for (j = 0; j < conn->screenbuffer.size_y; j++) {
                                for (i = 0; i < conn->screenbuffer.size_x; i++) {
                                        unsigned int size_x;
                                        
                                        size_x = conn->screenbuffer.size_x; 
                                        interbuffer[j * size_x + i] =
                                            *get_field_at(&conn->screenbuffer, i, j);
                                }
                        }
                        /* 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, conn->screenbuffer.size_x,
                            conn->screenbuffer.size_y);
                }
                
                if ((!interbuffer) || (rc != 0)) {
                        set_attrs(&conn->screenbuffer.attrs);
                        clrscr();
                        attrs = &conn->screenbuffer.attrs;
                        
                        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 (!attrs_same(*attrs, field->attrs))
                                                set_attrs(&field->attrs);
                                        attrs = &field->attrs;
                                        if ((field->character == ' ') &&
                                            (attrs_same(field->attrs,
                                            conn->screenbuffer.attrs)))
                                                continue;

                                        fb_putchar(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;
        kbd_event_t ev;
        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_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);
                        
                        /* switch to another virtual console */
                        
                        conn = &connections[active_console];

                        if ((ev.key >= KC_F1) && (ev.key < KC_F1 +
                            CONSOLE_COUNT) && ((ev.mods & KM_CTRL) == 0)) {
                                if (ev.key == KC_F12)
                                        change_console(KERNEL_CONSOLE);
                                else
                                        change_console(ev.key - KC_F1);
                                break;
                        }
                        
                        /* if client is awaiting key, send it */
                        if (conn->keyrequest_counter > 0) {             
                                conn->keyrequest_counter--;
                                ipc_answer_4(fifo_pop(conn->keyrequests), EOK,
                                    ev.type, ev.key, ev.mods, ev.c);
                                break;
                        }

                        keybuffer_push(&conn->keybuffer, &ev);
                        retval = 0;

                        break;
                default:
                        retval = ENOENT;
                }
                ipc_answer_0(callid, retval);
        }
}

/** Handle CONSOLE_WRITE call. */
static void cons_write(int consnum, ipc_callid_t rid, ipc_call_t *request)
{
        ipc_callid_t callid;
        size_t size;
        wchar_t ch;
        size_t off;

        if (!ipc_data_write_receive(&callid, &size)) {
                ipc_answer_0(callid, EINVAL);
                ipc_answer_0(rid, EINVAL);
        }

        if (size > CWRITE_BUF_SIZE)
                size = CWRITE_BUF_SIZE;

        (void) ipc_data_write_finalize(callid, cwrite_buf, size);

        off = 0;
        while (off < size) {
                ch = str_decode(cwrite_buf, &off, size);
                write_char(consnum, ch);
        }

        gcons_notify_char(consnum);
        ipc_answer_1(rid, EOK, size);
}

/** 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, arg3, arg4;
        connection_t *conn;
        screenbuffer_t *scr;
        
        if ((consnum = find_free_connection()) == -1) {
                ipc_answer_0(iid, ELIMIT);
                return;
        }
        conn = &connections[consnum];
        conn->used = 1;
        
        async_serialize_start();
        gcons_notify_connect(consnum);
        conn->client_phone = IPC_GET_ARG5(*icall);
        screenbuffer_clear(&conn->screenbuffer);
        if (consnum == active_console)
                clrscr();
        
        /* Accept the connection */
        ipc_answer_0(iid, EOK);
        
        while (1) {
                async_serialize_end();
                callid = async_get_call(&call);
                async_serialize_start();
                
                arg1 = 0;
                arg2 = 0;
                arg3 = 0;
                arg4 = 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_0(fifo_pop(conn->keyrequests),
                                    ENOENT);
                                break;
                        }
                        conn->used = 0;
                        return;
                case CONSOLE_PUTCHAR:
                        write_char(consnum, IPC_GET_ARG1(call));
                        gcons_notify_char(consnum);
                        break;
                case CONSOLE_WRITE:
                        cons_write(consnum, callid, &call);
                        continue;
                case CONSOLE_CLEAR:
                        /* Send message to fb */
                        if (consnum == active_console) {
                                async_msg_0(fb_info.phone, FB_CLEAR); 
                        }
                        
                        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:
                        fb_pending_flush();
                        if (consnum == active_console) {
                                async_req_0_0(fb_info.phone, FB_FLUSH);

                                scr = &(connections[consnum].screenbuffer);
                                curs_goto(scr->position_y, scr->position_x);
                        }
                        break;
                case CONSOLE_SET_STYLE:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        screenbuffer_set_style(&conn->screenbuffer, arg1);
                        if (consnum == 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(&conn->screenbuffer, arg1,
                            arg2, arg3);
                        if (consnum == 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(&conn->screenbuffer, arg1,
                            arg2);
                        if (consnum == active_console)
                                set_rgb_color(arg1, arg2);
                        break;
                case CONSOLE_CURSOR_VISIBILITY:
                        fb_pending_flush();
                        arg1 = IPC_GET_ARG1(call);
                        conn->screenbuffer.is_cursor_visible = arg1;
                        if (consnum == active_console)
                                curs_visibility(arg1);
                        break;
                case CONSOLE_GETKEY:
                        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_0(callid, ELIMIT);
                                }
                                continue;
                        }
                        kbd_event_t ev;
                        keybuffer_pop(&conn->keybuffer, &ev);
                        arg1 = ev.type;
                        arg2 = ev.key;
                        arg3 = ev.mods;
                        arg4 = ev.c;
                        break;
                case CONSOLE_KCON_ENABLE:
                        change_console(KERNEL_CONSOLE);
                        break;
                }
                ipc_answer_4(callid, EOK, arg1, arg2, arg3, arg4);
        }
}

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

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS Console service\n");
        
        ipcarg_t phonehash;
        int kbd_phone;
        size_t ib_size;
        int i;
        
        async_set_client_connection(client_connection);
        
        /* 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 -1;
        }
        
        if (ipc_connect_to_me(kbd_phone, SERVICE_CONSOLE, 0, 0, &phonehash) != 0) {
                printf(NAME ": Failed to create callback from keyboard service\n");
                return -1;
        }
        
        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;
        }
        
        /* Disable kernel output to the console */
        __SYSCALL0(SYS_DEBUG_DISABLE_CONSOLE);
        
        /* Initialize gcons */
        gcons_init(fb_info.phone);
        /* Synchronize, the gcons can have something in queue */
        async_req_0_0(fb_info.phone, FB_FLUSH);
        
        async_req_0_2(fb_info.phone, FB_GET_CSIZE, &fb_info.rows,
            &fb_info.cols); 
        set_rgb_color(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 = 0;
                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;

        /* Set up shared memory buffer. */
        ib_size = sizeof(keyfield_t) * fb_info.cols * fb_info.rows;
        interbuffer = as_get_mappable_page(ib_size);

        fb_pending.n = 0;

        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;
                }
        }
        
        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, 0, &phonehash) != 0)
                return -1;
        
        /* Receive kernel notifications */
        if (event_subscribe(EVENT_KCONSOLE, 0) != EOK)
                printf(NAME ": Error registering kconsole notifications\n");
                
        async_set_interrupt_received(interrupt_received);
        
        // FIXME: avoid connectiong to itself, keep using klog
        // printf(NAME ": Accepting connections\n");
        async_manager();
        
        return 0;
}

/** @}
 */