From 5251cde04c3306e1439584c37caf3f0fd9a56e41 Mon Sep 17 00:00:00 2001
From: folkert van heusden <mail@vanheusden.com>
Date: Sun, 21 Apr 2024 22:54:05 +0200
Subject: [PATCH] HALT and RESET only in kernel mode

---
 cpu.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/cpu.cpp b/cpu.cpp
index 7827463..287951a 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -1627,7 +1627,10 @@ bool cpu::misc_operations(const uint16_t instr)
 {
 	switch(instr) {
 		case 0b0000000000000000: // HALT
-			*event = EVENT_HALT;
+			if (getPSW_runmode() == 0)  // only in kernel mode
+				*event = EVENT_HALT;
+			else
+				trap(4);
 			return true;
 
 		case 0b0000000000000001: // WAIT
@@ -1681,8 +1684,11 @@ bool cpu::misc_operations(const uint16_t instr)
 			return true;
 
 		case 0b0000000000000101: // RESET
-			b->init();
-			init_interrupt_queue();
+			if (getPSW_runmode() == 0) {  // only in kernel mode
+				b->init();
+
+				init_interrupt_queue();
+			}
 			return true;
 	}