From 8e61503de1c8e3c854c6f740a56ba2f7015effc7 Mon Sep 17 00:00:00 2001
From: Rafal Kupiec <belliash@codingworkshop.eu.org>
Date: Wed, 31 Jan 2024 16:08:06 +0100
Subject: [PATCH] Implement RtlCompareGuids() kernel routine

---
 sdk/xtdk/rtlfuncs.h     |  5 +++++
 xtoskrnl/CMakeLists.txt |  1 +
 xtoskrnl/rtl/guid.c     | 26 ++++++++++++++++++++++++++
 xtoskrnl/xtoskrnl.spec  |  1 +
 4 files changed, 33 insertions(+)
 create mode 100644 xtoskrnl/rtl/guid.c

diff --git a/sdk/xtdk/rtlfuncs.h b/sdk/xtdk/rtlfuncs.h
index e435a7b..31ae467 100644
--- a/sdk/xtdk/rtlfuncs.h
+++ b/sdk/xtdk/rtlfuncs.h
@@ -48,6 +48,11 @@ RtlRemoveEntryList(IN PLIST_ENTRY Entry);
 
 
 /* Runtime Library routines forward references */
+XTAPI
+BOOLEAN
+RtlCompareGuids(IN PGUID Guid1,
+                IN PGUID Guid2);
+
 XTAPI
 SIZE_T
 RtlCompareMemory(IN PCVOID LeftBuffer,
diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index cdbc78b..27e17fc 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -41,6 +41,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/po/idle.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/atomic.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/byteswap.c
+    ${XTOSKRNL_SOURCE_DIR}/rtl/guid.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/ioreg.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/memory.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/plist.c
diff --git a/xtoskrnl/rtl/guid.c b/xtoskrnl/rtl/guid.c
new file mode 100644
index 0000000..9545716
--- /dev/null
+++ b/xtoskrnl/rtl/guid.c
@@ -0,0 +1,26 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/guid.c
+ * DESCRIPTION:     GUID manipulation routines
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+XTAPI
+BOOLEAN
+RtlCompareGuids(IN PGUID Guid1,
+                IN PGUID Guid2)
+{
+    PUINT Guid1Ptr, Guid2Ptr;
+
+    /* Cast GUIDs to UINT to compare 32-bits at a time */
+    Guid1Ptr = (PUINT)Guid1;
+    Guid2Ptr = (PUINT)Guid2;
+
+    /* Compare GUIDs */
+    return(Guid1Ptr[0] == Guid2Ptr[0] && Guid1Ptr[1] == Guid2Ptr[1] &&
+           Guid1Ptr[2] == Guid2Ptr[2] && Guid1Ptr[3] == Guid2Ptr[3]);
+}
diff --git a/xtoskrnl/xtoskrnl.spec b/xtoskrnl/xtoskrnl.spec
index cb5869c..bdd8c86 100644
--- a/xtoskrnl/xtoskrnl.spec
+++ b/xtoskrnl/xtoskrnl.spec
@@ -23,6 +23,7 @@
 @ stdcall KeSetTargetProcessorDpc(ptr long)
 @ stdcall KeSignalCallDpcDone(ptr)
 @ stdcall KeSignalCallDpcSynchronize(ptr)
+@ stdcall RtlCompareGuids(ptr ptr)
 @ stdcall RtlCompareMemory(ptr ptr long)
 @ stdcall RtlCopyMemory(ptr ptr long)
 @ stdcall RtlFillMemory(ptr long long)