event.svga

该源码是AT91rm9200的U-boot原代码。

we can clean up properly.
****************************************************************************/
static void exitHandler(int sig)
{
    exit(-1);
}

/****************************************************************************
REMARKS:
Sleep until the virtual terminal is active
****************************************************************************/
void wait_vt_active(void)
{
    while (ioctl(tty_fd, VT_WAITACTIVE, tty_vc) < 0) {
        if ((errno != EAGAIN) && (errno != EINTR)) {
            perror("ioctl(VT_WAITACTIVE)");
            exit(1);
            }
        usleep(150000);
        }
}

/****************************************************************************
REMARKS:
Signal handler called when our virtual terminal has been released and we are
losing the active focus.
****************************************************************************/
static void release_vt_signal(int n)
{
    forbid_vt_acquire = 1;
    if (forbid_vt_release) {
        forbid_vt_acquire = 0;
        ioctl(tty_fd, VT_RELDISP, 0);
        return;
        }

    // TODO: Call the user supplied suspendAppCallback and restore text
    //       mode (saving the existing mode so we can restore it).
    //
    //       Also if the suspendAppCallback is NULL then we have to
    //       ignore the switch request!
    if(suspendAppCallback){
      oldmode = VBE_getVideoMode();
      suspendAppCallback(true);
      VBE_setVideoMode(initmode);
    }

    ioctl(tty_fd, VT_RELDISP, 1);
    forbid_vt_acquire = 0;
    wait_vt_active();
}

/****************************************************************************
REMARKS:
Signal handler called when our virtual terminal has been re-aquired and we
are now regaiing the active focus.
****************************************************************************/
static void acquire_vt_signal(int n)
{
    forbid_vt_release = 1;
    if (forbid_vt_acquire) {
        forbid_vt_release = 0;
        return;
        }

    // TODO: Restore the old display mode, call the user suspendAppCallback
    //       and and we will be back in graphics mode.

    if(suspendAppCallback){
      VBE_setVideoMode(oldmode);
      suspendAppCallback(false);
    }

    ioctl(tty_fd, VT_RELDISP, VT_ACKACQ);
    forbid_vt_release = 0;
}

/****************************************************************************
REMARKS:
Function to set the action for a specific signal to call our signal handler.
****************************************************************************/
static void set_sigaction(int sig,void (*handler)(int))
{
    struct sigaction    siga;

    siga.sa_handler = handler;
    siga.sa_flags = SA_RESTART;
    memset(&(siga.sa_mask), 0, sizeof(sigset_t));
    sigaction(sig, &siga, NULL);
}

/****************************************************************************
REMARKS:
Function to take over control of VT switching so that we can capture
virtual terminal release and aquire signals, allowing us to properly
support VT switching while in graphics modes.
****************************************************************************/
static void take_vt_control(void)
{
    struct vt_mode      vtmode;

    ioctl(tty_fd, VT_GETMODE, &vtmode);
    oldvtmode = vtmode;
    vtmode.mode = VT_PROCESS;
    vtmode.relsig = SIGUSR1;
    vtmode.acqsig = SIGUSR2;
    set_sigaction(SIGUSR1, release_vt_signal);
    set_sigaction(SIGUSR2, acquire_vt_signal);
    ioctl(tty_fd, VT_SETMODE, &oldvtmode);
}

/****************************************************************************
REMARKS:
Set the shift keyboard LED's based on the current keyboard modifiers flags.
****************************************************************************/
static void updateLEDStatus(void)
{
    int state = 0;
    if (key_modifiers & EVT_CAPSSTATE)
        state |= LED_CAP;
    if (key_modifiers & EVT_NUMSTATE)
        state |= LED_NUM;
    ioctl(tty_fd,KDSETLED,state);
}

/****************************************************************************
PARAMETERS:
scancode    - Raw scan code to handle

REMARKS:
Handles the shift key modifiers and keeps track of the shift key states
so that we can return the correct ASCII codes for the keyboard.
****************************************************************************/
static void toggleModifiers(
    int scancode)
{
    static int caps_down = 0,num_down = 0;

    if (scancode & 0x80) {
        /* Handle key-release function */
        scancode &= 0x7F;
        if (scancode == 0x2A || scancode == 0x36)
            key_modifiers &= ~EVT_SHIFTKEY;
        else if (scancode == 0x1D || scancode == 0x61)
            key_modifiers &= ~EVT_CTRLSTATE;
        else if (scancode == 0x38 || scancode == 0x64)
            key_modifiers &= ~EVT_ALTSTATE;
        else if (scancode == 0x3A)
            caps_down = false;
        else if (scancode == 0x45)
            num_down = false;
        }
    else {
        /* Handle key-down function */
        scancode &= 0x7F;
        if (scancode == 0x2A || scancode == 0x36)
            key_modifiers |= EVT_SHIFTKEY;
        else if (scancode == 0x1D || scancode == 0x61)
            key_modifiers |= EVT_CTRLSTATE;
        else if (scancode == 0x38 || scancode == 0x64)
            key_modifiers |= EVT_ALTSTATE;
        else if (scancode == 0x3A) {
            if (!caps_down) {
                key_modifiers ^= EVT_CAPSSTATE;
                updateLEDStatus();
                }
            caps_down = true;
            }
        else if (scancode == 0x45) {
            if (!num_down) {
                key_modifiers ^= EVT_NUMSTATE;
                updateLEDStatus();
                }
            num_down = true;
            }
        }
}

/***************************************************************************
REMARKS:
Returns the number of bits that have changed from 0 to 1
(a negative value means the number of bits that have changed from 1 to 0) 
 **************************************************************************/
static int compareBits(short a, short b)
{
    int ret = 0;
    if( (a&1) != (b&1) ) ret += (b&1) ? 1 : -1;
    if( (a&2) != (b&2) ) ret += (b&2) ? 1 : -1;
    if( (a&4) != (b&4) ) ret += (b&4) ? 1 : -1;
    return ret;
}

/***************************************************************************
REMARKS:
Turns off all keyboard state because we can't rely on them anymore as soon
as we switch VT's
***************************************************************************/
static void keyboard_clearstate(void)
{
  key_modifiers = 0;
  memset(key_down, 0, sizeof(key_down));
}

/****************************************************************************
REMARKS:
Pumps all events from the console event queue into the WinDirect event queue.
****************************************************************************/
static void pumpEvents(void)
{
    static uchar    buf[KBDREADBUFFERSIZE];
    static char     data[5];
    static int      old_buts, old_mx, old_my;
    static struct timeval t;
    fd_set fds;
    int             numkeys,i;
    int             dx, dy, buts;

    /* Read all pending keypresses from keyboard buffer and process */
    while ((numkeys = read(tty_fd, buf, KBDREADBUFFERSIZE)) > 0) {
        for (i = 0; i < numkeys; i++) {
            toggleModifiers(buf[i]);
            if (key_modifiers & EVT_ALTSTATE){
              int fkey = 0;

              // Do VT switching here for Alt+Fx keypresses
              switch(buf[i] & 0x7F){
              case 59 ... 68: /* F1 to F10 */
                fkey = (buf[i] & 0x7F) - 58;
                break;
              case 87: /* F11 */
              case 88: /* F12 */
                fkey = (buf[i] & 0x7F) - 76;
                break;
              }
              if(fkey){
                struct vt_stat vts;
                ioctl(tty_fd, VT_GETSTATE, &vts);
                
                if(fkey != vts.v_active){
                  keyboard_clearstate();
                  ioctl(tty_fd, VT_ACTIVATE, fkey);
                }
              }
            }

            if (buf[i] & 0x80)
                addKeyEvent(EVT_KEYUP,buf[i] & 0x7F);
            else
                addKeyEvent(EVT_KEYDOWN,buf[i] & 0x7F);
            }

        // TODO: If we want to handle VC switching we will need to do it
        //       in here so that we can switch away from the VC and then
        //       switch back to it later. Right now VC switching is disabled
        //       and in order to enable it we need to save/restore the state
        //       of the graphics screen (using the suspendAppCallback and
        //       saving/restoring the state of the current display mode).

        }

    /* Read all pending mouse events and process them */
    if(conn > 0){
        FD_ZERO(&fds);
        FD_SET(conn, &fds);
        t.tv_sec = t.tv_usec = 0L;
        while (select(conn+1, &fds, NULL, NULL, &t) > 0) {
            if(read(conn, data, 5) == 5){
                buts = (~data[0]) & 0x07;
                dx = (char)(data[1]) + (char)(data[3]);
                dy = -((char)(data[2]) + (char)(data[4]));
                
                mx += dx; my += dy;
                
                if (dx || dy)
                    addMouseEvent(EVT_MOUSEMOVE, 0, mx, my, buts);
                
                if (buts != old_buts){
                    int c = compareBits(buts,old_buts);
                    if(c>0)
                        addMouseEvent(EVT_MOUSEDOWN, 0, mx, my, buts);
                    else if(c<0)
                        addMouseEvent(EVT_MOUSEUP, 0, mx, my, buts);
                }
                old_mx = mx; old_my = my;
                old_buts = buts;
                FD_SET(conn, &fds);
                t.tv_sec = t.tv_usec = 0L;
            }
        }
    }
}

/*------------------------ Public interface routines ----------------------*/

/****************************************************************************
PARAMETERS:
which       - Which code for event to post
what        - Event code for event to post
message     - Event message
modifiers   - Shift key/mouse button modifiers

RETURNS:
True if the event was posted, false if queue is full.

REMARKS:
Posts an event to the event queue. This routine can be used to post any type
of event into the queue.
****************************************************************************/
ibool _WDAPI WD_postEvent(
    ulong which,
    uint what,
    ulong message,
    ulong modifiers)
{
    WD_event    evt;

    if (count < EVENTQSIZE) {
        /* Save information in event record */
        evt.which = which;
        evt.what = what;
        evt.when = getTimeStamp();
        evt.message = message;
        evt.modifiers = modifiers;
        addEvent(&evt);             /* Add to tail of event queue   */
        return true;
        }
    else
        return false;
}

/****************************************************************************
PARAMETERS:
mask    - Event mask to use

REMARKS:
Flushes all the event specified in 'mask' from the event queue.
****************************************************************************/
void _WDAPI WD_flushEvent(
    uint mask)
{
    WD_event    evt;

    do {                            /* Flush all events */
        WD_getEvent(&evt,mask);
        } while (evt.what != EVT_NULLEVT);
}

/****************************************************************************
PARAMETERS:
evt     - Place to store event
mask    - Event mask to use

REMARKS: