diff --git a/sdk/xtdk/rtlfuncs.h b/sdk/xtdk/rtlfuncs.h
index 1da539c..fe468a4 100644
--- a/sdk/xtdk/rtlfuncs.h
+++ b/sdk/xtdk/rtlfuncs.h
@@ -40,11 +40,11 @@ RtlInitializeListHead32(IN PLIST_ENTRY32 ListHead);
 
 VOID
 RtlInsertHeadList(IN OUT PLIST_ENTRY ListHead,
-                  IN OUT PLIST_ENTRY Entry);
+                  IN PLIST_ENTRY Entry);
 
 VOID
 RtlInsertTailList(IN OUT PLIST_ENTRY ListHead,
-                  IN OUT PLIST_ENTRY Entry);
+                  IN PLIST_ENTRY Entry);
 
 BOOLEAN
 RtlListEmpty(PLIST_ENTRY ListHead);
@@ -80,9 +80,9 @@ RtlStringLength(IN CONST PUCHAR String,
 
 XTCDECL
 INT
-RtlStringToWideString(PWCHAR Destination,
-                      CONST PUCHAR *Source,
-                      SIZE_T Length);
+RtlStringToWideString(OUT PWCHAR Destination,
+                      IN CONST PUCHAR *Source,
+                      IN SIZE_T Length);
 
 XTCDECL
 INT
@@ -92,9 +92,9 @@ RtlWideStringCompare(IN CONST PWCHAR String1,
 
 XTCDECL
 PWCHAR
-RtlWideStringConcatenate(PWCHAR Destination,
-                         PWCHAR Source,
-                         SIZE_T Count);
+RtlWideStringConcatenate(OUT PWCHAR Destination,
+                         IN PWCHAR Source,
+                         IN SIZE_T Count);
 
 XTCDECL
 SIZE_T
diff --git a/xtldr/amd64/memory.c b/xtldr/amd64/memory.c
index 23f58a3..7c42599 100644
--- a/xtldr/amd64/memory.c
+++ b/xtldr/amd64/memory.c
@@ -73,9 +73,9 @@ BlCreateStack(IN PVOID *StackPtr,
  */
 EFI_STATUS
 BlEnablePaging(IN PLIST_ENTRY MemoryMappings,
-                IN PVOID VirtualAddress,
-                IN PEFI_LOADED_IMAGE_PROTOCOL ImageProtocol,
-                IN PVOID *PtePointer)
+               IN PVOID VirtualAddress,
+               IN PEFI_LOADED_IMAGE_PROTOCOL ImageProtocol,
+               IN PVOID *PtePointer)
 {
     PLOADER_MEMORY_MAPPING Mapping;
     EFI_PHYSICAL_ADDRESS Address;
diff --git a/xtldr/includes/blproto.h b/xtldr/includes/blproto.h
index 51cb824..dc4c437 100644
--- a/xtldr/includes/blproto.h
+++ b/xtldr/includes/blproto.h
@@ -14,7 +14,7 @@
 
 
 /* Loader protocol routine pointers */
-typedef EFI_STATUS (*PBL_ADD_VIRTUAL_MEMORY_MAPPING)(IN PLIST_ENTRY MemoryMappings, IN PVOID VirtualAddress, IN PVOID PhysicalAddress, IN UINT NumberOfPages, LOADER_MEMORY_TYPE MemoryType);
+typedef EFI_STATUS (*PBL_ADD_VIRTUAL_MEMORY_MAPPING)(IN PLIST_ENTRY MemoryMappings, IN PVOID VirtualAddress, IN PVOID PhysicalAddress, IN UINT NumberOfPages, IN LOADER_MEMORY_TYPE MemoryType);
 typedef EFI_STATUS (*PBL_ALLOCATE_PAGES)(IN UINT64 Size, OUT PEFI_PHYSICAL_ADDRESS Memory);
 typedef EFI_STATUS (*PBL_ALLOCATE_POOL)(IN UINT_PTR Size, OUT PVOID *Memory);
 typedef EFI_STATUS (*PBL_ENABLE_PAGING)(IN PLIST_ENTRY MemoryMappings, IN PVOID VirtualAddress, IN PEFI_LOADED_IMAGE_PROTOCOL ImageProtocol, IN PVOID *PtePointer);
diff --git a/xtldr/includes/xtbl.h b/xtldr/includes/xtbl.h
index 5a8e2e6..d72e539 100644
--- a/xtldr/includes/xtbl.h
+++ b/xtldr/includes/xtbl.h
@@ -37,7 +37,7 @@ BlAddVirtualMemoryMapping(IN PLIST_ENTRY MemoryMappings,
                           IN PVOID VirtualAddress,
                           IN PVOID PhysicalAddress,
                           IN UINT NumberOfPages,
-                          LOADER_MEMORY_TYPE MemoryType);
+                          IN LOADER_MEMORY_TYPE MemoryType);
 
 EFI_STATUS
 BlCloseVolume(IN PEFI_HANDLE VolumeHandle);
diff --git a/xtldr/memory.c b/xtldr/memory.c
index 7026718..fd3f577 100644
--- a/xtldr/memory.c
+++ b/xtldr/memory.c
@@ -36,7 +36,7 @@ BlAddVirtualMemoryMapping(IN PLIST_ENTRY MemoryMappings,
                           IN PVOID VirtualAddress,
                           IN PVOID PhysicalAddress,
                           IN UINT NumberOfPages,
-                          LOADER_MEMORY_TYPE MemoryType)
+                          IN LOADER_MEMORY_TYPE MemoryType)
 {
     PLOADER_MEMORY_MAPPING Mapping1, Mapping2, Mapping3;
     PVOID PhysicalAddressEnd, PhysicalAddress2End;
diff --git a/xtldr/modules/dummy/dummy.c b/xtldr/modules/dummy/dummy.c
index 9824fc1..f01d86a 100644
--- a/xtldr/modules/dummy/dummy.c
+++ b/xtldr/modules/dummy/dummy.c
@@ -32,8 +32,8 @@ PXT_BOOT_LOADER_PROTOCOL XtLdrProtocol;
  * @since XT 1.0
  */
 EFI_STATUS
-BlXtLdrModuleMain(EFI_HANDLE ImageHandle,
-                  PEFI_SYSTEM_TABLE SystemTable)
+BlXtLdrModuleMain(IN EFI_HANDLE ImageHandle,
+                  IN PEFI_SYSTEM_TABLE SystemTable)
 {
     EFI_STATUS Status;
 
diff --git a/xtldr/modules/xtos/includes/xtos.h b/xtldr/modules/xtos/includes/xtos.h
index 7f0b188..477b490 100644
--- a/xtldr/modules/xtos/includes/xtos.h
+++ b/xtldr/modules/xtos/includes/xtos.h
@@ -35,7 +35,7 @@ XtpLoadModule(IN PEFI_FILE_HANDLE BootDir,
               OUT PPECOFF_IMAGE_CONTEXT *ImageContext);
 
 EFI_STATUS
-BlXtLdrModuleMain(EFI_HANDLE ImageHandle,
-                  PEFI_SYSTEM_TABLE SystemTable);
+BlXtLdrModuleMain(IN EFI_HANDLE ImageHandle,
+                  IN PEFI_SYSTEM_TABLE SystemTable);
 
 #endif /* __XTLDR_MODULES_XTOS_H */
diff --git a/xtoskrnl/rtl/plist.c b/xtoskrnl/rtl/plist.c
index d8dd398..6d93dfb 100644
--- a/xtoskrnl/rtl/plist.c
+++ b/xtoskrnl/rtl/plist.c
@@ -58,7 +58,7 @@ RtlInitializeListHead32(IN PLIST_ENTRY32 ListHead)
  */
 VOID
 RtlInsertHeadList(IN OUT PLIST_ENTRY ListHead,
-                  IN OUT PLIST_ENTRY Entry)
+                  IN PLIST_ENTRY Entry)
 {
     Entry->Flink = ListHead->Flink;
     Entry->Blink = ListHead;
@@ -81,7 +81,7 @@ RtlInsertHeadList(IN OUT PLIST_ENTRY ListHead,
  */
 VOID
 RtlInsertTailList(IN OUT PLIST_ENTRY ListHead,
-                  IN OUT PLIST_ENTRY Entry)
+                  IN PLIST_ENTRY Entry)
 {
     Entry->Flink = ListHead;
     Entry->Blink = ListHead->Blink;
diff --git a/xtoskrnl/rtl/string.c b/xtoskrnl/rtl/string.c
index cc4940b..628c1bc 100644
--- a/xtoskrnl/rtl/string.c
+++ b/xtoskrnl/rtl/string.c
@@ -69,9 +69,9 @@ RtlStringLength(IN CONST PUCHAR String,
  */
 XTCDECL
 INT
-RtlStringToWideString(PWCHAR Destination,
-                      CONST PUCHAR *Source,
-                      SIZE_T Length)
+RtlStringToWideString(OUT PWCHAR Destination,
+                      IN CONST PUCHAR *Source,
+                      IN SIZE_T Length)
 {
     PUCHAR LocalSource = *Source;
     SIZE_T Count = Length;