From ab3ebbe227c72b745a46f9233fbfbb27477586b8 Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Wed, 15 Jul 2026 23:54:13 +0200
Subject: kernel: implement fork()

- sys_fork: switch to a kernel stack, bump-allocate a cart-RAM bank, copy the
  parent's 8 KiB bank via a WRAM bounce buffer, plant a switch-in frame so the
  child returns 0 to the post-fork PC, fill the child PCB (shared ROM text)
- add AllocRamBank (bump allocator) + FindFreeSlot helpers
- demo: init forks; parent prints P, child prints C (PCPC...); nested fork
  gives three distinct pids (123...)
- README: document the fork mechanism, mark syscall status
---
 src/syscall.asm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/syscall.asm')

diff --git a/src/syscall.asm b/src/syscall.asm
index 71e1f2b..ca2857c 100644
--- a/src/syscall.asm
+++ b/src/syscall.asm
@@ -35,7 +35,7 @@ SyscallTrap::
 ; -----------------------------------------------------------------------------
 SyscallTable:
     dw sys_exit                 ; 0
-    dw sys_nosys                ; 1  FORK  (TODO)
+    dw sys_fork                 ; 1  FORK
     dw sys_nosys                ; 2  READ  (TODO)
     dw sys_write                ; 3  WRITE
     dw sys_nosys                ; 4  OPEN  (TODO)
-- 
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