From de725da74db5cba0f9bfd0755269e1683423d87b Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Wed, 15 Jul 2026 23:44:28 +0200
Subject: 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
---
 src/kdata.asm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 src/kdata.asm

(limited to 'src/kdata.asm')

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
-- 
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