Port I/O and Networking

0x30 (Send value to port)

Write one byte to a hardware I/O port. Both args are pointers — the kernel dereferences them.

Argument 1	Argument 2	Implemented
pointer to port number (*const u16)	pointer to value (*const u32; low byte written)	✅

0x31 (Receive value from port)

Read a 32-bit value from a hardware I/O port. Both args are pointers — the kernel dereferences them.

Argument 1	Argument 2	Implemented
pointer to port number (*const u16)	pointer to output (*mut u32; receives the result)	✅

0x32 (Serial port)

UART port COM1.

Argument 1	Argument 2	Meaning	Implemented
0x01	0x00	Serial port initialization.	✅
0x02	pointer to value	Read from the serial port.	✅
0x03	pointer to value	Write to the serial port.	✅

0x33 (Create packet)

Argument 1	Argument 2	Meaning	Implemented
0x01	pointer to buffer	Create an IPv4 packet.	✅
0x02	pointer to buffer	Create an ICMP packet.	✅
0x03	pointer to buffer	Create a TCP packet.	✅

0x34 (Send frame/packet)

Argument 1	Argument 2	Meaning	Implemented
0x01	pointer to buffer	Send an IPv4 packet (derives frame length from the IP header).	✅
0x04	pointer to raw Ethernet frame	Send a raw Ethernet frame. Length is derived from the EtherType field (0x0800 = IPv4, 0x0806 = ARP).	✅

0x35 (Socket receive)

Pops a message from the calling process' MQ. Non-blocking returns 0 immediately if the queue is empty; blocking suspends the process until a frame arrives.

Argument 1	Argument 2	Implemented
0x00 = non-blocking, non-zero = blocking	pointer to buffer	✅

0x36 (Socket send)

Copies 512 bytes from the buffer and pushes a message to the target process' MQ, then wakes the target.

Argument 1	Argument 2	Implemented
target process PID	pointer to buffer	✅

0x37 (Register Ethernet driver, bind TCP port)

Ethernet driver registration, or port binding.

Argument 1	Argument 2	Implemented
TCP port number (0 for global driver)	unused	✅

0x38 (Get networking status)

Query network status (read-only). Writes { mac[6], ip[4], drv_active, n_ports, ports[16] } into the struct.

Returns InvalidInput on invalid pointer, Ok otherwise.

Argument 1	Argument 2	Implemented
pointer to NetStatus struct	unused	✅