add missing fault handlers instead of throwing everything into the GP bin, add more ways to crash in native shell

code/kernel/ke_selftest.c

@@ -477,6 +477,24 @@ static void KiRunIrpKernelApcSelfTest(const HAL_API* hal) {
 
 
 
+
+// -------------------------------------------------------------------------
+// Virtual memory mapping invariants
+// -------------------------------------------------------------------------
+static void KiRunMemoryMappingSelfTest(void) {
+    PHYSICAL_ADDRESS phys = 0;
+    uint64_t flags = 0;
+    KSTATUS s = MmQueryPage(0, &phys, &flags);
+    if (s != STATUS_NOT_FOUND) {
+        KePanic("MM selftest: virtual page zero is mapped phys=%016llx flags=%016llx status=%u\n",
+                (unsigned long long)phys,
+                (unsigned long long)flags,
+                (unsigned)s);
+    }
+
+    DbgPrint("MM selftest: page zero unmapped\n");
+}
+
 // -------------------------------------------------------------------------
 // String-view ABI self-test
 // -------------------------------------------------------------------------
@@ -732,6 +750,7 @@ static void KiRunTrapFrameSelfTest(void) {
 void KiRunKernelSelfTests(const HAL_API* hal) {
     DbgPrint("Kernel selftests: begin\n");
     KiRunKernelApcSelfTest();
+    KiRunMemoryMappingSelfTest();
     KiRunStringViewSelfTest();
     KiRunIrpKernelApcSelfTest(hal);
     KiRunAsyncFileIoSelfTest();