From e94e50b5d9eee72c3a4aede810809d75c23b9b7a Mon Sep 17 00:00:00 2001
From: belliash <belliash@codingworkshop.eu.org>
Date: Thu, 26 Jan 2023 20:08:57 +0100
Subject: [PATCH] Implement HlLoadInterruptDescriptorTable() intrinsics for
 loading IDT

---
 sdk/xtdk/amd64/hlfuncs.h    |  4 ++++
 sdk/xtdk/i686/hlfuncs.h     |  4 ++++
 xtoskrnl/hl/amd64/cpufunc.c | 20 ++++++++++++++++++++
 xtoskrnl/hl/i686/cpufunc.c  | 20 ++++++++++++++++++++
 4 files changed, 48 insertions(+)

diff --git a/sdk/xtdk/amd64/hlfuncs.h b/sdk/xtdk/amd64/hlfuncs.h
index ccdcc6d..6c453e6 100644
--- a/sdk/xtdk/amd64/hlfuncs.h
+++ b/sdk/xtdk/amd64/hlfuncs.h
@@ -63,6 +63,10 @@ XTCDECL
 VOID
 HlLoadGlobalDescriptorTable(IN PVOID Source);
 
+XTCDECL
+VOID
+HlLoadInterruptDescriptorTable(IN PVOID Source);
+
 XTCDECL
 VOID
 HlLoadSegment(IN USHORT Segment,
diff --git a/sdk/xtdk/i686/hlfuncs.h b/sdk/xtdk/i686/hlfuncs.h
index c7d0877..a77ce77 100644
--- a/sdk/xtdk/i686/hlfuncs.h
+++ b/sdk/xtdk/i686/hlfuncs.h
@@ -63,6 +63,10 @@ XTCDECL
 VOID
 HlLoadGlobalDescriptorTable(IN PVOID Source);
 
+XTCDECL
+VOID
+HlLoadInterruptDescriptorTable(IN PVOID Source);
+
 XTCDECL
 VOID
 HlLoadSegment(IN USHORT Segment,
diff --git a/xtoskrnl/hl/amd64/cpufunc.c b/xtoskrnl/hl/amd64/cpufunc.c
index 562b0d6..f2c18a5 100644
--- a/xtoskrnl/hl/amd64/cpufunc.c
+++ b/xtoskrnl/hl/amd64/cpufunc.c
@@ -256,6 +256,26 @@ HlLoadGlobalDescriptorTable(IN PVOID Source)
                  : "memory");
 }
 
+/**
+ * Loads the values in the source operand into the interrupt descriptor table register (IDTR).
+ *
+ * @param Source
+ *        Specifies a memory location that contains the base address of IDT.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+HlLoadInterruptDescriptorTable(IN PVOID Source)
+{
+    asm volatile("lidt %0"
+                 :
+                 : "m" (*(PSHORT)Source)
+                 : "memory");
+}
+
 /**
  * Loads source data into specified segment.
  *
diff --git a/xtoskrnl/hl/i686/cpufunc.c b/xtoskrnl/hl/i686/cpufunc.c
index 6b86b00..286af7c 100644
--- a/xtoskrnl/hl/i686/cpufunc.c
+++ b/xtoskrnl/hl/i686/cpufunc.c
@@ -256,6 +256,26 @@ HlLoadGlobalDescriptorTable(IN PVOID Source)
                  : "memory");
 }
 
+/**
+ * Loads the values in the source operand into the interrupt descriptor table register (IDTR).
+ *
+ * @param Source
+ *        Specifies a memory location that contains the base address of IDT.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+HlLoadInterruptDescriptorTable(IN PVOID Source)
+{
+    asm volatile("lidt %0"
+                 :
+                 : "m" (*(PSHORT)Source)
+                 : "memory");
+}
+
 /**
  * Loads source data into specified segment.
  *