gbos.git/src/net.asm, branch master

net: SYS_POLLCON + larger console ring for link-injected input

2026-07-17T18:22:34Z

Programs that own their main loop (the IRC client) need to poll for typed input without blocking. pollin() only sees the on-screen keyboard; bytes injected over the link (gbhub 'type', for scripted/hub-driven sessions) land in the kernel console ring, previously only drained by the blocking KGetc path. Add SYS_POLLCON: a non-blocking con_pop for userland. Also enlarge that console ring 16 -> 64. One net_pump drains an entire serial burst into the ring at once, so a whole injected command line has to fit or bytes are dropped and lines merge (a 20-char command came out truncated and glued to the next). 64 covers a full line; mask stays a power of two.

net: chat client - async receive + OSK send over the link port

2026-07-16T23:39:29Z

The application layer of the link-port demo, and it ties the whole system together: the LCD terminal displays, the on-screen keyboard types, and the link port carries a live chat. Kernel: sys_srecv_nb (non-blocking link receive; A=byte, CF=none) and sys_pollin (poll the OSK for a typed char without blocking) - syscalls 31/32. Both are what a poll loop needs to receive and type at once. Userland: c/chat.c runs a poll loop - it feeds non-blocking bytes through a SLIP receive state machine and prints whole incoming frames as messages, while pollin() drives the on-screen keyboard; SELECT shows the keys, type a line, START sends it as a frame. libc srecv_nb()/pollin(). Host: tools/gateway.py --mode chat is a simple bot peer (echoes each GB message and injects a few async ones); --keys can drive the OSK for tests. Verified: the gateway pushes 'welcome', ' hey gameboy!', ' nice link cable' unprompted and the GB displays all three (async receive); typing 'hi' on the OSK echoes it and emits the SLIP frame \xC0hi\xC0 (send). A Game Boy in the chat, keyboard on screen, over the link cable.

net: SLIP framing over the link port + a host gateway (echo round-trip)

2026-07-16T23:28:23Z

First step of link-port networking. The LCD terminal + OSK freed the serial port from console duty, so it can be the network link. Kernel (src/net.asm): raw link-port serial that bypasses the console/ terminal - sys_ssend (transmit, GB drives the clock) and sys_srecv (receive, GB slave, blocks by yielding). Syscalls 29/30. Userland: libc ssend()/srecv(); c/necho.c does SLIP (RFC 1055) framing over them - send a packet, receive the reply, print it. Host: tools/gateway.py wraps the emulator, owns its link serial, speaks SLIP, and (for now) echoes every frame back - the "link cable adapter". Console (ASCII) bytes on the same channel are printed for visibility. Verified: `necho` sends a SLIP frame, the gateway decodes+echoes it, and gbos prints the reply - a real framed round-trip over the Game Boy link port. Next: swap the echo for actual network ops (DNS/HTTP or IRC/chat).