From b5544e84232b80351e7c58501c1632080a354d12 Mon Sep 17 00:00:00 2001 From: user Date: Fri, 17 Jul 2026 01:28:23 +0200 Subject: net: SLIP framing over the link port + a host gateway (echo round-trip) 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). --- src/syscall.asm | 2 ++ 1 file changed, 2 insertions(+) (limited to 'src/syscall.asm') diff --git a/src/syscall.asm b/src/syscall.asm index c602097..cb16bbe 100644 --- a/src/syscall.asm +++ b/src/syscall.asm @@ -63,6 +63,8 @@ SyscallTable: dw sys_chdir ; 26 CHDIR dw sys_opendir ; 27 OPENDIR dw sys_pipe ; 28 PIPE + dw sys_ssend ; 29 SSEND + dw sys_srecv ; 30 SRECV ; ----------------------------------------------------------------------------- sys_nosys: -- cgit v1.3.1-sl0p