CPU reset: Make sure to turn off PSE extensions flag, and clear CR4, …

…so that Windows XP boots properly after a reboot if it used PSE extensions.
joncampbell123 · Dec 26, 2024 · 81b0514 · 81b0514
1 parent 1968d02
commit 81b0514
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/cpu/cpu.cpp b/src/cpu/cpu.cpp
@@ -4222,6 +4222,11 @@ void CPU_OnReset(Section* sec) {
 	CPU_Snap_Back_Forget();
 	CPU_SetFlags(0,~0UL);
 
+    do_pse = false;
+    if(CPU_ArchitectureType >= CPU_ARCHTYPE_486NEW) {
+        cpu.cr4 = 0;
+    }
+
 	Segs.limit[cs]=0xFFFF;
 	Segs.expanddown[cs]=false;
 	if (CPU_ArchitectureType >= CPU_ARCHTYPE_386) {