feat: add NTP; fix networking bugs/regressions

kernel/src/Drivers/Net/E1000.cpp

@@ -250,7 +250,10 @@ namespace Drivers::Net::E1000 {
             KernelLogStream(INFO, "E1000") << "Link status change: " << (linkUp ? "UP" : "DOWN");
         }
 
-        if (icr & ICR_RXT0) {
+        // Both receive-timer and descriptor-threshold causes mean completed
+        // RX descriptors may be waiting. ICR is clear-on-read, so ignoring
+        // RXDMT0 can strand a lone packet until unrelated traffic arrives.
+        if (icr & (ICR_RXT0 | ICR_RXDMT0)) {
             // Process received packets
             while (true) {
                 uint32_t nextIdx = (g_rxTail + 1) % RX_DESC_COUNT;

kernel/src/Drivers/Net/E1000E.cpp

@@ -477,7 +477,10 @@ namespace Drivers::Net::E1000E {
             KernelLogStream(INFO, "E1000E") << "Link status change: " << (linkUp ? "UP" : "DOWN");
         }
 
-        if (icr & ICR_RXT0) {
+        // Both receive-timer and descriptor-threshold causes mean completed
+        // RX descriptors may be waiting. ICR is clear-on-read, so ignoring
+        // RXDMT0 can strand a lone packet until unrelated traffic arrives.
+        if (icr & (ICR_RXT0 | ICR_RXDMT0)) {
             while (true) {
                 uint32_t nextIdx = (g_rxTail + 1) % RX_DESC_COUNT;
                 RxDescriptor& desc = g_rxDescs[nextIdx];