thermosphere: add more sysreg stuff & start writing trap stuff

thermosphere/src/traps.c

@@ -0,0 +1,20 @@
+#include "traps.h"
+#include "sysreg.h"
+
+void enableTraps(void)
+{
+    u64 hcr = GET_SYSREG(hcr_el2);
+
+    // Trap *writes* to memory control registers
+    hcr |= HCR_TVM;
+
+    // Trap SMC instructions
+    hcr |= HCR_TSC;
+
+    // Reroute physical IRQ to EL2
+    hcr |= HCR_IMO;
+
+    // TODO debug exceptions
+
+    SET_SYSREG(hcr_el2, hcr);
+}