add power point

kern/e1000.c~

@@ -187,9 +187,9 @@ int transmit_packet (void* package, int size){
 	e1000[E1000_TDT] = ( cur_desc + 1) % NUM_TRANS_DESC; // advance iterator TDT.
 
 	//make u-env sleep(yet runnnable) until the package is sent to it won't touch package mid transmit:
-	while ( !(tx_desc_list[cur_desc].status & E1000_TXD_STAT_DD) ){
+	//while ( !(tx_desc_list[cur_desc].status & E1000_TXD_STAT_DD) ){
 		sched_yield();
-	}
+	//}
 
 
 	return 0;
@@ -269,6 +269,7 @@ void init_zero_copy_receive(){
 
 
 void e1000_interrupt_handler(){
+	//calls the corresponding interrupt handlers.
 	int reg = e1000[E1000_ICR];
 	if (reg & E1000_ICR_RXT0){
 		e1000_rec_handler();

net/testoutput.c~

@@ -0,0 +1,42 @@
+#include "ns.h"
+
+#ifndef TESTOUTPUT_COUNT
+#define TESTOUTPUT_COUNT 1000
+#endif
+
+static envid_t output_envid;
+
+static struct jif_pkt *pkt = (struct jif_pkt*)REQVA;
+
+
+void
+umain(int argc, char **argv)
+{
+	envid_t ns_envid = sys_getenvid();
+	int i, r;
+
+	binaryname = "testoutput";
+
+	output_envid = fork();
+	if (output_envid < 0)
+		panic("error forking");
+	else if (output_envid == 0) {
+		output(ns_envid);
+		return;
+	}
+
+	for (i = 0; i < TESTOUTPUT_COUNT; i++) {
+		if ((r = sys_page_alloc(0, pkt, PTE_P|PTE_U|PTE_W)) < 0)
+			panic("sys_page_alloc: %e", r);
+		pkt->jp_len = snprintf(pkt->jp_data,
+				       PGSIZE - sizeof(pkt->jp_len),
+				       "Packet %02d", i);
+		cprintf("Transmitting packet %d\n", i);
+		ipc_send(output_envid, NSREQ_OUTPUT, pkt, PTE_P|PTE_W|PTE_U);
+		sys_page_unmap(0, pkt);
+	}
+
+	// Spin for a while, just in case IPC's or packets need to be flushed
+	for (i = 0; i < TESTOUTPUT_COUNT*2; i++)
+		sys_yield();
+}