console.c

qemu性能直逼VMware的仿真器QEMU 的模擬速度約為實機的 25％；約為 Bochs 的 60 倍。Plex86、User-Mode-Linux、VMware 和 Virtual PC 則比

#endif
            break;
        }
        break;
    case TTY_STATE_ESC: /* check if it is a terminal escape sequence */
        if (ch == '[') {
            for(i=0;i<MAX_ESC_PARAMS;i++)
                s->esc_params[i] = 0;
            s->nb_esc_params = 0;
            s->state = TTY_STATE_CSI;
        } else {
            s->state = TTY_STATE_NORM;
        }
        break;
    case TTY_STATE_CSI: /* handle escape sequence parameters */
        if (ch >= '0' && ch <= '9') {
            if (s->nb_esc_params < MAX_ESC_PARAMS) {
                s->esc_params[s->nb_esc_params] = 
                    s->esc_params[s->nb_esc_params] * 10 + ch - '0';
            }
        } else {
            s->nb_esc_params++;
            if (ch == ';')
                break;
#ifdef DEBUG_CONSOLE
            fprintf(stderr, "escape sequence CSI%d;%d%c, %d parameters\n",
                    s->esc_params[0], s->esc_params[1], ch, s->nb_esc_params);
#endif
            s->state = TTY_STATE_NORM;
            switch(ch) {
            case 'A':
                /* move cursor up */
                if (s->esc_params[0] == 0) {
                    s->esc_params[0] = 1;
                }
                s->y -= s->esc_params[0];
                if (s->y < 0) {
                    s->y = 0;
                }
                break;
            case 'B':
                /* move cursor down */
                if (s->esc_params[0] == 0) {
                    s->esc_params[0] = 1;
                }
                s->y += s->esc_params[0];
                if (s->y >= s->height) {
                    s->y = s->height - 1;
                }
                break;
            case 'C':
                /* move cursor right */
                if (s->esc_params[0] == 0) {
                    s->esc_params[0] = 1;
                }
                s->x += s->esc_params[0];
                if (s->x >= s->width) {
                    s->x = s->width - 1;
                }
                break;
            case 'D':
                /* move cursor left */
                if (s->esc_params[0] == 0) {
                    s->esc_params[0] = 1;
                }
                s->x -= s->esc_params[0];
                if (s->x < 0) {
                    s->x = 0;
                }
                break;
            case 'G':
                /* move cursor to column */
                s->x = s->esc_params[0] - 1;
                if (s->x < 0) {
                    s->x = 0;
                }
                break;
            case 'f':
            case 'H':
                /* move cursor to row, column */
                s->x = s->esc_params[1] - 1;
                if (s->x < 0) {
                    s->x = 0;
                }
                s->y = s->esc_params[0] - 1;
                if (s->y < 0) {
                    s->y = 0;
                }
                break;
            case 'J':
                switch (s->esc_params[0]) {
                case 0:
                    /* clear to end of screen */
                    for (y = s->y; y < s->height; y++) {
                        for (x = 0; x < s->width; x++) {
                            if (y == s->y && x < s->x) {
                                continue;
                            }
                            console_clear_xy(s, x, y);
                        }
                    }
                    break;
                case 1:
                    /* clear from beginning of screen */
                    for (y = 0; y <= s->y; y++) {
                        for (x = 0; x < s->width; x++) {
                            if (y == s->y && x > s->x) {
                                break;
                            }
                            console_clear_xy(s, x, y);
                        }
                    }
                    break;
                case 2:
                    /* clear entire screen */
                    for (y = 0; y <= s->height; y++) {
                        for (x = 0; x < s->width; x++) {
                            console_clear_xy(s, x, y);
                        }
                    }
                break;
                }
            case 'K':
                switch (s->esc_params[0]) {
                case 0:
                /* clear to eol */
                for(x = s->x; x < s->width; x++) {
                        console_clear_xy(s, x, s->y);
                }
                break;
                case 1:
                    /* clear from beginning of line */
                    for (x = 0; x <= s->x; x++) {
                        console_clear_xy(s, x, s->y);
                    }
                    break;
                case 2:
                    /* clear entire line */
                    for(x = 0; x < s->width; x++) {
                        console_clear_xy(s, x, s->y);
                    }
                break;
            }
                break;
            case 'm':
            console_handle_escape(s);
            break;
            case 'n':
                /* report cursor position */
                /* TODO: send ESC[row;colR */
                break;
            case 's':
                /* save cursor position */
                s->x_saved = s->x;
                s->y_saved = s->y;
                break;
            case 'u':
                /* restore cursor position */
                s->x = s->x_saved;
                s->y = s->y_saved;
                break;
            default:
#ifdef DEBUG_CONSOLE
                fprintf(stderr, "unhandled escape character '%c'\n", ch);
#endif
                break;
            }
            break;
        }
    }
}

void console_select(unsigned int index)
{
    TextConsole *s;

    if (index >= MAX_CONSOLES)
        return;
    s = consoles[index];
    if (s) {
        active_console = s;
        if (s->text_console) {
            if (s->g_width != s->ds->width ||
                s->g_height != s->ds->height) {
                s->g_width = s->ds->width;
                s->g_height = s->ds->height;
                text_console_resize(s);
            }
            console_refresh(s);
        } else {
            vga_hw_invalidate();
        }
    }
}

static int console_puts(CharDriverState *chr, const uint8_t *buf, int len)
{
    TextConsole *s = chr->opaque;
    int i;

    console_show_cursor(s, 0);
    for(i = 0; i < len; i++) {
        console_putchar(s, buf[i]);
    }
    console_show_cursor(s, 1);
    return len;
}

static void console_send_event(CharDriverState *chr, int event)
{
    TextConsole *s = chr->opaque;
    int i;

    if (event == CHR_EVENT_FOCUS) {
        for(i = 0; i < nb_consoles; i++) {
            if (consoles[i] == s) {
                console_select(i);
                break;
            }
        }
    }
}

static void kbd_send_chars(void *opaque)
{
    TextConsole *s = opaque;
    int len;
    uint8_t buf[16];
    
    len = qemu_chr_can_read(s->chr);
    if (len > s->out_fifo.count)
        len = s->out_fifo.count;
    if (len > 0) {
        if (len > sizeof(buf))
            len = sizeof(buf);
        qemu_fifo_read(&s->out_fifo, buf, len);
        qemu_chr_read(s->chr, buf, len);
    }
    /* characters are pending: we send them a bit later (XXX:
       horrible, should change char device API) */
    if (s->out_fifo.count > 0) {
        qemu_mod_timer(s->kbd_timer, qemu_get_clock(rt_clock) + 1);
    }
}

/* called when an ascii key is pressed */
void kbd_put_keysym(int keysym)
{
    TextConsole *s;
    uint8_t buf[16], *q;
    int c;

    s = active_console;
    if (!s || !s->text_console)
        return;

    switch(keysym) {
    case QEMU_KEY_CTRL_UP:
        console_scroll(-1);
        break;
    case QEMU_KEY_CTRL_DOWN:
        console_scroll(1);
        break;
    case QEMU_KEY_CTRL_PAGEUP:
        console_scroll(-10);
        break;
    case QEMU_KEY_CTRL_PAGEDOWN:
        console_scroll(10);
        break;
    default:
        /* convert the QEMU keysym to VT100 key string */
        q = buf;
        if (keysym >= 0xe100 && keysym <= 0xe11f) {
            *q++ = '\033';
            *q++ = '[';
            c = keysym - 0xe100;
            if (c >= 10)
                *q++ = '0' + (c / 10);
            *q++ = '0' + (c % 10);
            *q++ = '~';
        } else if (keysym >= 0xe120 && keysym <= 0xe17f) {
            *q++ = '\033';
            *q++ = '[';
            *q++ = keysym & 0xff;
        } else {
                *q++ = keysym;
        }
        if (s->chr->chr_read) {
            qemu_fifo_write(&s->out_fifo, buf, q - buf);
            kbd_send_chars(s);
        }
        break;
    }
}

static TextConsole *new_console(DisplayState *ds, int text)
{
    TextConsole *s;
    int i;

    if (nb_consoles >= MAX_CONSOLES)
        return NULL;
    s = qemu_mallocz(sizeof(TextConsole));
    if (!s) {
        return NULL;
    }
    if (!active_console || (active_console->text_console && !text))
        active_console = s;
    s->ds = ds;
    s->text_console = text;
    if (text) {
        consoles[nb_consoles++] = s;
    } else {
        /* HACK: Put graphical consoles before text consoles.  */
        for (i = nb_consoles; i > 0; i--) {
            if (!consoles[i - 1]->text_console)
                break;
            consoles[i] = consoles[i - 1];
        }
        consoles[i] = s;
    }
    return s;
}

TextConsole *graphic_console_init(DisplayState *ds, vga_hw_update_ptr update,
                                  vga_hw_invalidate_ptr invalidate,
                                  vga_hw_screen_dump_ptr screen_dump,
                                  void *opaque)
{
    TextConsole *s;

    s = new_console(ds, 0);
    if (!s)
      return NULL;
    s->hw_update = update;
    s->hw_invalidate = invalidate;
    s->hw_screen_dump = screen_dump;
    s->hw = opaque;
    return s;
}

int is_graphic_console(void)
{
    return !active_console->text_console;
}

CharDriverState *text_console_init(DisplayState *ds)
{
    CharDriverState *chr;
    TextConsole *s;
    int i,j;
    static int color_inited;

    chr = qemu_mallocz(sizeof(CharDriverState));
    if (!chr)
        return NULL;
    s = new_console(ds, 1);
    if (!s) {
        free(chr);
        return NULL;
    }
    chr->opaque = s;
    chr->chr_write = console_puts;
    chr->chr_send_event = console_send_event;

    s->chr = chr;
    s->out_fifo.buf = s->out_fifo_buf;
    s->out_fifo.buf_size = sizeof(s->out_fifo_buf);
    s->kbd_timer = qemu_new_timer(rt_clock, kbd_send_chars, s);
    
    if (!color_inited) {
        color_inited = 1;
        for(j = 0; j < 2; j++) {
            for(i = 0; i < 8; i++) {
                color_table[j][i] = col_expand(s->ds, 
                        vga_get_color(s->ds, color_table_rgb[j][i]));
            }
        }
    }
    s->y_displayed = 0;
    s->y_base = 0;
    s->total_height = DEFAULT_BACKSCROLL;
    s->x = 0;
    s->y = 0;
    s->g_width = s->ds->width;
    s->g_height = s->ds->height;

    /* Set text attribute defaults */
    s->t_attrib_default.bold = 0;
    s->t_attrib_default.uline = 0;
    s->t_attrib_default.blink = 0;
    s->t_attrib_default.invers = 0;
    s->t_attrib_default.unvisible = 0;
    s->t_attrib_default.fgcol = COLOR_WHITE;
    s->t_attrib_default.bgcol = COLOR_BLACK;

    /* set current text attributes to default */
    s->t_attrib = s->t_attrib_default;
    text_console_resize(s);

    qemu_chr_reset(chr);

    return chr;
}