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. Both are released when the calling process exits, is killed or crashes.

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	✅

0x3d (Network configuration)

The machine's network configuration: IPv4 address, netmask, gateway, the gateway's MAC, DNS and the card's MAC, as the global Ethernet driver (eth) got them by DHCP or was given them. Every network stack reads it rather than assuming addresses of its own. The gateway's MAC matters most: a process that is not the global driver cannot ARP for it, because the replies go to the driver.

With Argument 1 0x01 the kernel fills the NetConfig at Argument 2; the IP and MAC come from the system configuration (the same ones 0x01 and 0x38 report), the rest is what the driver last set. Unset fields are zero.

With Argument 1 0x02 the calling process sets it from the struct at Argument 2. Only the registered global driver (0x37 with port 0) may; anyone else gets InvalidInput. The IP is stored as 0x01/0x02 would store it; the MAC is the card's and is ignored. Busy means the system configuration was locked that instant: try again.

Returns InvalidInput on an invalid pointer or Argument 1, Ok otherwise.

Argument 1	Argument 2	Implemented
0x01 read, 0x02 set	pointer to NetConfig struct	✅