diff --git a/src/xenia/cpu/processor.cc b/src/xenia/cpu/processor.cc
index c5cea7411..21512acbb 100644
--- a/src/xenia/cpu/processor.cc
+++ b/src/xenia/cpu/processor.cc
@@ -135,6 +135,17 @@ uint64_t Processor::Execute(
   return context->r[3];
 }
 
+Irql Processor::RaiseIrql(Irql new_value) {
+  return static_cast<Irql>(
+      poly::atomic_exchange(static_cast<uint32_t>(new_value),
+                            reinterpret_cast<volatile uint32_t*>(&irql_)));
+}
+
+void Processor::LowerIrql(Irql old_value) {
+  poly::atomic_exchange(static_cast<uint32_t>(old_value),
+                        reinterpret_cast<volatile uint32_t*>(&irql_));
+}
+
 uint64_t Processor::ExecuteInterrupt(
     uint32_t cpu, uint64_t address, uint64_t args[], size_t arg_count) {
   SCOPE_profile_cpu_f("cpu");
diff --git a/src/xenia/cpu/processor.h b/src/xenia/cpu/processor.h
index f13587ef5..d5e79b0f8 100644
--- a/src/xenia/cpu/processor.h
+++ b/src/xenia/cpu/processor.h
@@ -27,6 +27,14 @@ namespace xe {
 namespace cpu {
 
 
+enum class Irql : uint32_t {
+  PASSIVE = 0,
+  APC = 1,
+  DISPATCH = 2,
+  DPC = 3,
+};
+
+
 class Processor {
 public:
   Processor(Emulator* emulator);
@@ -44,6 +52,9 @@ public:
       XenonThreadState* thread_state, uint64_t address, uint64_t args[],
       size_t arg_count);
 
+  Irql RaiseIrql(Irql new_value);
+  void LowerIrql(Irql old_value);
+
   uint64_t ExecuteInterrupt(
       uint32_t cpu, uint64_t address, uint64_t args[], size_t arg_count);
 
@@ -54,6 +65,7 @@ private:
   XenonRuntime*       runtime_;
   Memory*             memory_;
 
+  Irql                irql_;
   xe_mutex_t*         interrupt_thread_lock_;
   XenonThreadState*   interrupt_thread_state_;
   uint64_t            interrupt_thread_block_;
diff --git a/src/xenia/kernel/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl_threading.cc
index 17991b47a..0078dbfc7 100644
--- a/src/xenia/kernel/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl_threading.cc
@@ -9,6 +9,7 @@
 
 #include <xenia/kernel/xboxkrnl_threading.h>
 
+#include <xenia/cpu/processor.h>
 #include <xenia/kernel/dispatcher.h>
 #include <xenia/kernel/kernel_state.h>
 #include <xenia/kernel/native_list.h>
@@ -1275,9 +1276,9 @@ SHIM_CALL KfAcquireSpinLock_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t lock_ptr = SHIM_GET_ARG_32(0);
 
-  XELOGD(
-      "KfAcquireSpinLock(%.8X)",
-      lock_ptr);
+  // XELOGD(
+  //     "KfAcquireSpinLock(%.8X)",
+  //     lock_ptr);
 
   auto lock = reinterpret_cast<uint32_t*>(SHIM_MEM_ADDR(lock_ptr));
   uint32_t old_irql = xeKfAcquireSpinLock(lock);
@@ -1301,10 +1302,10 @@ SHIM_CALL KfReleaseSpinLock_shim(
   uint32_t lock_ptr = SHIM_GET_ARG_32(0);
   uint32_t old_irql = SHIM_GET_ARG_32(1);
 
-  XELOGD(
-      "KfReleaseSpinLock(%.8X, %d)",
-      lock_ptr,
-      old_irql);
+  // XELOGD(
+  //     "KfReleaseSpinLock(%.8X, %d)",
+  //     lock_ptr,
+  //     old_irql);
 
   xeKfReleaseSpinLock(reinterpret_cast<uint32_t*>(SHIM_MEM_ADDR(lock_ptr)),
                       old_irql);
@@ -1315,9 +1316,9 @@ SHIM_CALL KeAcquireSpinLockAtRaisedIrql_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t lock_ptr = SHIM_GET_ARG_32(0);
 
-  XELOGD(
-      "KeAcquireSpinLockAtRaisedIrql(%.8X)",
-      lock_ptr);
+  // XELOGD(
+  //     "KeAcquireSpinLockAtRaisedIrql(%.8X)",
+  //     lock_ptr);
 
   // Lock.
   auto lock = reinterpret_cast<uint32_t*>(SHIM_MEM_ADDR(lock_ptr));
@@ -1332,9 +1333,9 @@ SHIM_CALL KeReleaseSpinLockFromRaisedIrql_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t lock_ptr = SHIM_GET_ARG_32(0);
 
-  XELOGD(
-      "KeReleaseSpinLockFromRaisedIrql(%.8X)",
-      lock_ptr);
+  // XELOGD(
+  //     "KeReleaseSpinLockFromRaisedIrql(%.8X)",
+  //     lock_ptr);
 
   // Unlock.
   auto lock = reinterpret_cast<uint32_t*>(SHIM_MEM_ADDR(lock_ptr));
@@ -1349,8 +1350,8 @@ void xeKeEnterCriticalRegion() {
 
 SHIM_CALL KeEnterCriticalRegion_shim(
     PPCContext* ppc_state, KernelState* state) {
-  XELOGD(
-      "KeEnterCriticalRegion()");
+  // XELOGD(
+  //     "KeEnterCriticalRegion()");
   xeKeEnterCriticalRegion();
 }
 
@@ -1362,12 +1363,31 @@ void xeKeLeaveCriticalRegion() {
 
 SHIM_CALL KeLeaveCriticalRegion_shim(
     PPCContext* ppc_state, KernelState* state) {
-  XELOGD(
-      "KeLeaveCriticalRegion()");
+  // XELOGD(
+  //     "KeLeaveCriticalRegion()");
   xeKeLeaveCriticalRegion();
 }
 
 
+SHIM_CALL KeRaiseIrqlToDpcLevel_shim(
+    PPCContext* ppc_state, KernelState* state) {
+  // XELOGD(
+  //     "KeRaiseIrqlToDpcLevel()");
+  auto old_value = state->processor()->RaiseIrql(cpu::Irql::DPC);
+  SHIM_SET_RETURN_32(old_value);
+}
+
+
+SHIM_CALL KfLowerIrql_shim(
+    PPCContext* ppc_state, KernelState* state) {
+  uint32_t old_value = SHIM_GET_ARG_32(0);
+  // XELOGD(
+  //     "KfLowerIrql(%d)",
+  //     old_value);
+  state->processor()->LowerIrql(static_cast<cpu::Irql>(old_value));
+}
+
+
 SHIM_CALL NtQueueApcThread_shim(
     PPCContext* ppc_state, KernelState* state) {
   uint32_t thread_handle = SHIM_GET_ARG_32(0);
@@ -1673,6 +1693,9 @@ void xe::kernel::xboxkrnl::RegisterThreadingExports(
   SHIM_SET_MAPPING("xboxkrnl.exe", KeEnterCriticalRegion, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", KeLeaveCriticalRegion, state);
 
+  SHIM_SET_MAPPING("xboxkrnl.exe", KeRaiseIrqlToDpcLevel, state);
+  SHIM_SET_MAPPING("xboxkrnl.exe", KfLowerIrql, state);
+
   //SHIM_SET_MAPPING("xboxkrnl.exe", NtQueueApcThread, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", KeInitializeApc, state);
   SHIM_SET_MAPPING("xboxkrnl.exe", KeInsertQueueApc, state);