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| author | user <user@clank> | 2026-07-15 23:54:13 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-15 23:54:13 +0200 |
| commit | ab3ebbe227c72b745a46f9233fbfbb27477586b8 (patch) | |
| tree | d71f87605d17c5653f34ebcdef3941f898cd5b91 /src/boot.asm | |
| parent | gbos scaffold: working cooperative microkernel (verified ABAB in emulator) (diff) | |
| download | gbos-ab3ebbe227c72b745a46f9233fbfbb27477586b8.tar.gz gbos-ab3ebbe227c72b745a46f9233fbfbb27477586b8.tar.xz gbos-ab3ebbe227c72b745a46f9233fbfbb27477586b8.zip | |
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
Diffstat (limited to 'src/boot.asm')
| -rw-r--r-- | src/boot.asm | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/src/boot.asm b/src/boot.asm index 513c392..73ea860 100644 --- a/src/boot.asm +++ b/src/boot.asm @@ -50,18 +50,12 @@ KernelInit: call CopyHramCode ; move context-switch trampoline into HRAM call ProcInit ; wipe process table - ; --- spawn the two demo tasks (text-in-ROM model) --- - ; task A: entry TaskA, RAM bank 0, u-area WRAM bank 1 - ld hl, TaskA - ld b, 0 ; RAM bank + ; --- spawn the init task (pid 1); it fork()s the rest --- + ld hl, TaskInit + ld b, 0 ; cart-RAM bank 0 ld c, 1 ; WRAM u-area bank call ProcCreate - ld hl, TaskB - ld b, 1 - ld c, 2 - call ProcCreate - call SchedInit ; pick first task, set wCurProc ; interrupts: enable timer for preemption |