// Try to receive packet over network
static int
sys_net_try_receive(char *data, int *len)
{
if ((uintptr_t)data >= UTOP) {
return -E_INVAL;
}
*len = e1000_receive(data);
if (*len > 0) {
return 0;
}
return *len;
}
// Try to receive packet over network
static int
sys_net_try_receive(char *data, int *len)
{
//cprintf("in the system call to receive from network driver\n");
if ((uintptr_t)data >= UTOP) {
return -E_INVAL;
}
//cprintf("calling e1000_receive()\n");
*len = e1000_receive(data);
if (*len > 0) {
//curenv->env_status = ENV_NOT_RUNNABLE;
return 0;
}
return *len;
}
static irqreturn_t e1000_interrupt_handler(int irq, void *dev_id)
{
struct e1000_dev *e1000 = (struct e1000_dev *)dev_id;
/* Get and clear interrupt status bits */
int intr_cause = e1000_inl(e1000, E1000_ICR);
e1000_outl(e1000, E1000_ICR, intr_cause);
/* not for me */
if (intr_cause == 0)
{
return IRQ_NONE;
}
/* Handle interrupts according to status bit settings */
/* Link status change */
if (intr_cause & (1 << 2))
{
if (e1000_inl(e1000, E1000_STATUS) & 2)
{
e1000->bifup = true;
}
else
{
e1000->bifup = false;
}
}
/* Check if we received an incoming packet, if so, call skel_receive() */
/* Rx-descriptor Timer expired */
if (intr_cause & (1 << 7))
{
e1000_receive(e1000);
}
/* Tx queue empty */
if (intr_cause & (1 << 1))
{
wd_cancel(e1000->txtimeout);
}
/* Check is a packet transmission just completed. If so, call skel_txdone.
* This may disable further Tx interrupts if there are no pending
* tansmissions.
*/
/* Tx-descriptor Written back */
if (intr_cause & (1 << 0))
{
devif_poll(&e1000->netdev, e1000_txpoll);
}
/* Rx-Descriptors Low */
if (intr_cause & (1 << 4))
{
int tail;
tail = e1000->rx_ring.tail + e1000->rx_ring.free;
tail %= CONFIG_E1000_N_RX_DESC;
e1000->rx_ring.tail = tail;
e1000->rx_ring.free = 0;
e1000_outl(e1000, E1000_RDT, tail);
}
return IRQ_HANDLED;
}
