typedef struct ETHStat
{
    u32     rcvcount;
    u32     sendcount;
    u32     cntof;
    
    u16     re;
    u16     te;
    u16     fifoe;
    u16     rbf;
    u16     rx_bf;
    u16     rx_crc;
    u16     rx_fae;
    u16     rx_fo;
    u16     rx_rw;
    u16     rx_rf;
    u16     tx_crs;
    u16     tx_uf;
    u16     tx_owc;
} ETHStat;

static int __ETHVersion = 0;
static ETHStat ethstat;
static OSThreadQueue threadQ;
static OSAlarm rcvchk_alarm;
static OSResetFunctionInfo ResetFunctionInfo = { OnReset, 127 };

static u8 private_macaddr[6];
static u8 broadcastheader[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static u8 __revid;
static u16 __devid = 0xd107;
static u8 __acstart = 0x4e;

// SI EXI Clock Lock register.
#define SIEXILK         ( *(volatile u32 *)(0xCC00643C))
#define SIEXILK_LOCK    0x80000000

// ---------------------------------------------------------------------------

int ETHInit(void)
{
    static BOOL firsttime = TRUE;
    u32 cid, fcsr, phy0r;

    if(firsttime)
        OSRegisterVersion(__ETHVersion);

    OSInitThreadQueue(&threadQ);

    // Unlock 32 MHz EXI clock.
    SIEXILK &= ~SIEXILK_LOCK;

    waitexilock();
    __sendbusy = 0;

    memset(&ethstat, 0, sizeof(ETHStat));

    protoarray = 0;
    protonum = 0;
    recvcallback0 = 0;
    recvcallback1 = 0;

    // Retrieve and check the ID of an ethernet adapter.
    cid = readCID();
    if(cid != 0x04020200)
    {
        EXIUnlock(0);
        OSReport("cid = %08x\n", cid);
        return -1;
    }

    reset();
    readcmdLong(0x20, private_macaddr, 6);
    __revid = readEXIcmd(1);
    writeEXIcmdLong(4, &__devid, 2);
    writeEXIcmd(5, __acstart);
    fcsr = readcmd(0x5b) & ~0x80;
    writecmd(0x5b, fcsr);
    writecmd(0x5e, 1);
    phy0r = readcmd(0x5c) | 0x04;
    writecmd(0x5c, phy0r);
    writecmd(1, 0);
    writecmd(0x50, 0x80);
    writecmd(8, 0);
    writeEXIcmd(2, 0xF8);

    EXISetExiCallback(2, exiinthandler);

    if(firsttime)
    {
        OSCreateAlarm(&rcvchk_alarm);
        OSSetPeriodicAlarm(&rcvchk_alarm, 

        firsttime = FALSE;
    }

    OSRegisterResetFunction(&ResetFunctionInfo);

    EXIUnlock(0);
    return 1;
}

// ---------------------------------------------------------------------------

void exiinthandler(void)
{
    u32 ret, ir, exiisr;

    if( EXILock(0, 2, exiinthandler) == 0) return;

    ir = readEXIcmd(3);
    writeEXIcmd(2, 0);




}

// ---------------------------------------------------------------------------

void unlockcallback(void)
{
    OSWakeupThread(&threadQ);
}

void waitexilock(void)
{
    BOOL enabled = OSDisableInterrupts();

    if( EXILock(0, 2, 0, unlockcallback) != 1 )
    {
        OSRestoreInterrupts(enabled);
        return;
    }

    OSSleepThread(&threadQ);
    OSRestoreInterrupts(enabled);
}

u32 readCID(void)
{
    u32 cid;
    u16 ethcmd = 0;

    EXISelect(0, 2, 0);
    EXIImm(0, &ethcmd, 2, 1, 0);
    EXISync(0);
    EXIImm(0, &cid, 4, 0, 0);
    EXISync(0);
    EXIDeselect(0);

    return cid;
}

void reset(void)
{
    writecmd(0x60, 0);
    waitmicro(10000);

    readEXIcmdWait200Micro(15);
    waitmicro(10000);

    writecmd(0, 1);
    writecmd(0, 0);
}