diff options
| author | user <user@clank> | 2026-07-15 23:44:28 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-15 23:44:28 +0200 |
| commit | de725da74db5cba0f9bfd0755269e1683423d87b (patch) | |
| tree | dc39eca9fbd290393ed51de31eee5e4bd6af8375 /src/kdata.asm | |
| download | gbos-de725da74db5cba0f9bfd0755269e1683423d87b.tar.gz gbos-de725da74db5cba0f9bfd0755269e1683423d87b.tar.xz gbos-de725da74db5cba0f9bfd0755269e1683423d87b.zip | |
gbos scaffold: working cooperative microkernel (verified ABAB in emulator)
- fix ClearKernelRAM clobbering the kernel stack (only clear $C000-$CBFF)
- fix SyscallTrap clobbering DE (buffer arg) during table dispatch
- README: run via ~/dev/gbc --headless; note bring-up bugs
Diffstat (limited to 'src/kdata.asm')
| -rw-r--r-- | src/kdata.asm | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/kdata.asm b/src/kdata.asm new file mode 100644 index 0000000..efc780a --- /dev/null +++ b/src/kdata.asm @@ -0,0 +1,22 @@ +; ============================================================================= +; kdata.asm - kernel globals in fixed WRAM0 (always mapped, never swapped) +; ============================================================================= +INCLUDE "include/gbos.inc" + +SECTION "kernel_bss", WRAM0[$C000] + +wProcTable:: DS MAX_PROCS * PROC_SIZE ; the process table +wCurProc:: DS 2 ; pointer to running PCB +wCurPid:: DS 1 ; running pid (reserved) +wNextPid:: DS 1 ; pid allocator +wSchedNext:: DS 1 ; round-robin cursor (slot index) +wKernelPCB:: DS PROC_SIZE ; outgoing-context holder for 1st switch + ; (kernel/idle context; never resumed) + +; scratch used by ProcCreate +wTmpEntry:: DS 2 +wTmpRamB:: DS 1 +wTmpWramB:: DS 1 +wTmpSlot:: DS 1 +wTmpPid:: DS 1 +wTmpSP:: DS 2 |