From 3fd3454212dc1d4dc396e393812833ec2e15e41a Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Sat, 18 Jul 2026 00:46:26 +0200
Subject: kernel: dmesg-style boot spew before init spawns

Print everything the kernel knows implicitly at boot, Linux-flavored, on
the LCD console and mirrored over the link (gbhub logs each GB's boot):

  gbos sm83 microkernel
  console: CGB (boot a=$11)          <- boot ROM's A/B, saved at entry
  cart: mbc5, 1M rom, 128K sram      <- our own cart header ($0147-49)
  mem: 32K wram 16K vram 127B hram   <- CGB constants
  proc: 8 slots, 31 programs         <- link-time table sizes
  net: slip on link port, 4 sockets
  fs: gbfs v3 mounted, 120/128 blk free  <- bitmap popcount; 'formatted'
  tty: 40x18 console, SELECT = osk      on first boot
  init: spawning pid 1

New src/dmesg.asm with kernel print helpers (kputc/kputs/kputhex/kputdec)
that bypass KPutc (no process context at boot). term_init now runs before
net/fs init so the spew is visible as subsystems come up.
---
 src/boot.asm | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'src/boot.asm')

diff --git a/src/boot.asm b/src/boot.asm
index c29267d..c2d461a 100644
--- a/src/boot.asm
+++ b/src/boot.asm
@@ -41,12 +41,19 @@ SECTION "kinit", ROM0
 KernelInit:
     di
     ld sp, KSTACK_TOP
+    push af                     ; boot ROM hands the console model in A/B -
+    push bc                     ; park it on the (uncleared) stack for dmesg
 
     ; enable cart RAM (MBC5)
     ld a, $0A
     ld [MBC5_RAM_ENABLE], a
 
     call ClearKernelRAM
+    pop bc
+    pop af
+    ld [wBootA], a
+    ld a, b
+    ld [wBootB], a
     call CopyHramCode           ; move context-switch trampoline into HRAM
     call ProcInit               ; wipe process table
     ; point wCurProc at the (zeroed) kernel PCB so disk I/O during boot restores
@@ -56,11 +63,15 @@ KernelInit:
     ld a, HIGH(wKernelPCB)
     ld [wCurProc+1], a
     call pipe_init              ; mark all pipes free
+    call term_init              ; LCD console first, so the boot spew is visible
+    call boot_banner            ; dmesg: kernel/console/cart/mem/proc lines
     call net_init               ; clear the socket table, set our IP (10.0.0.2)
+    call boot_net
     call fs_init                ; mount the disk (format on first boot; persists)
-    call term_init              ; set up the LCD text terminal
+    call boot_fs
     call osk_init               ; build the on-screen keyboard (window layer)
-    ; terminal starts blank; shell output flows in via KPutc
+    call boot_tty
+    call boot_init              ; "init: spawning pid 1"
 
     ; --- spawn the init task (pid 1); it fork()s the rest ---
     ld hl, TaskInit
-- 
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