GMMOS: the Guru Meditation Micro OS, alive under the PSOGM

A panic no longer ends in a picture. The report is drawn as before, and
then GMMOS runs under it: the real kernel stays dead -- the other
processors are halted, and nothing of it is called that locks, sleeps,
allocates or waits for an interrupt -- and GMMOS keeps its own clock
(the TSC), its own keyboard (micro drivers, polled), and the screen.

On the report: a live status line counting down the three-minute
power-off, which any key cancels, and the keys.

  Space  the last 300 lines of this boot's log as QR codes, a page per
         symbol, numbered; + and - trade module size for capacity
  L      the log on screen, scrolled
  T      a terminal: why, log, grep, ps, cpus, pci, mem (page tables
         walked first, so a bad address cannot fault), uptime, restart,
         poweroff
  R R    restart; P P power off -- twice, so a stray key does neither

The first micro driver is PS/2, polled: kbd.c with everything but the
keys taken out. The probe asks the keyboard to echo, so a controller
with nothing behind it is not offered as one. Polling also sidesteps the
IRQ 1 polarity quirk, which is about interrupt routing.

A panic inside GMMOS (or a second one in the report) is reported and
then only blinks; it does not re-enter GMMOS.

Checked under QEMU: every screen; two QR pages read off a screenshot
with zbar decode to the log text exactly; restart reboots; left alone it
still powers off at three minutes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4

Makefile

@@ -115,6 +115,9 @@ KERN_ZSTD = $(addprefix $(BUILD)/zstd/, \
               decompress/zstd_decompress_block.o)
 KERN_ZSTD += $(BUILD)/kernel/scff/scff.o
 
+# GMMOS, what runs after a panic, and its micro drivers. See include/gmmos/gmmos.h.
+KERN_GMMOS = $(addprefix $(BUILD)/kernel/gmmos/, gmmos.o ps2.o)
+
 KERN_PROC = $(addprefix $(BUILD)/kernel/proc/, \
               proc.o)
 
@@ -126,7 +129,8 @@ KERN_SYS  = $(addprefix $(BUILD)/kernel/sys/, \
 KERN_ARCH += $(BUILD)/kernel/arch/x86_64/vectors.o
 
 KERNOBJS = $(KERN_ARCH) $(KERN_CORE) $(KERN_DEV) $(KERN_DRIVERS) \
-           $(KERN_FS) $(KERN_NET) $(KERN_ACPI) $(KERN_ZSTD) $(KERN_PROC) $(KERN_SYS)
+           $(KERN_FS) $(KERN_NET) $(KERN_ACPI) $(KERN_ZSTD) $(KERN_GMMOS) \
+           $(KERN_PROC) $(KERN_SYS)
 # entry.o must be first in link order; remove it from KERNOBJS for the rule
 KERN_NOENTRY = $(filter-out $(BUILD)/kernel/arch/x86_64/entry.o, $(KERNOBJS))
 
@@ -963,6 +967,10 @@ $(BUILD)/kernel/dev/%.o: kernel/dev/%.c
 	@mkdir -p $(BUILD)/kernel/dev
 	$(CC) $(CFLAGS) -c $< -o $@
 
+$(BUILD)/kernel/gmmos/%.o: kernel/gmmos/%.c
+	@mkdir -p $(BUILD)/kernel/gmmos
+	$(CC) $(CFLAGS) -c $< -o $@
+
 # `$(dir $@)` rather than a fixed path: drivers are grouped into one directory
 # per device class (gpu/, net/, bus/, usb/), so the output directory varies with
 # the target and a hardcoded mkdir only creates the top one.