From b1d013977fe401e584fa163b2b91d4880b19cfa2 Mon Sep 17 00:00:00 2001
From: Aiken Harris <harraiken91@gmail.com>
Date: Sun, 26 Apr 2026 17:50:21 +0200
Subject: [PATCH] Add compiler intrinsic support functions for 64-bit
 arithmetic

---
 xtoskrnl/CMakeLists.txt      |   1 +
 xtoskrnl/rtl/amd64/intrin.cc |  10 +++
 xtoskrnl/rtl/i686/intrin.cc  | 162 +++++++++++++++++++++++++++++++++++
 3 files changed, 173 insertions(+)
 create mode 100644 xtoskrnl/rtl/amd64/intrin.cc
 create mode 100644 xtoskrnl/rtl/i686/intrin.cc

diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index bc59fd9..39a6cb1 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -75,6 +75,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/po/idle.cc
     ${XTOSKRNL_SOURCE_DIR}/rtl/${ARCH}/dispatch.cc
     ${XTOSKRNL_SOURCE_DIR}/rtl/${ARCH}/exsup.cc
+    ${XTOSKRNL_SOURCE_DIR}/rtl/${ARCH}/intrin.cc
     ${XTOSKRNL_SOURCE_DIR}/rtl/atomic.cc
     ${XTOSKRNL_SOURCE_DIR}/rtl/bitmap.cc
     ${XTOSKRNL_SOURCE_DIR}/rtl/data.cc
diff --git a/xtoskrnl/rtl/amd64/intrin.cc b/xtoskrnl/rtl/amd64/intrin.cc
new file mode 100644
index 0000000..5fc979f
--- /dev/null
+++ b/xtoskrnl/rtl/amd64/intrin.cc
@@ -0,0 +1,10 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/amd64/intrin.cc
+ * DESCRIPTION:     Compiler intrinsic support routines
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
diff --git a/xtoskrnl/rtl/i686/intrin.cc b/xtoskrnl/rtl/i686/intrin.cc
new file mode 100644
index 0000000..bddd45a
--- /dev/null
+++ b/xtoskrnl/rtl/i686/intrin.cc
@@ -0,0 +1,162 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/i686/intrin.cc
+ * DESCRIPTION:     Compiler intrinsic support routines
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+
+/**
+ * Divides a 64-bit signed integer by a 64-bit signed integer.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit signed dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit signed divisor.
+ *
+ * @return This routine returns the 64-bit signed quotient.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+LONGLONG
+_alldiv(IN LONGLONG Dividend,
+        IN LONGLONG Divisor)
+{
+    /* Call the internal signed division routine and return the quotient */
+    return RTL::Math::Divide64(Dividend, Divisor, NULLPTR);
+}
+
+/**
+ * Divides a 64-bit signed integer by a 64-bit signed integer and retrieves the remainder.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit signed dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit signed divisor.
+ *
+ * @param Remainder
+ *        Supplies a pointer to a variable that receives the 64-bit signed remainder.
+ *
+ * @return This routine returns the 64-bit signed quotient.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+LONGLONG
+_alldvrm(IN LONGLONG Dividend,
+         IN LONGLONG Divisor,
+         OUT PLONGLONG Remainder)
+{
+    /* Call the internal signed division routine to compute both quotient and remainder */
+    return RTL::Math::Divide64(Dividend, Divisor, Remainder);
+}
+/**
+ * Calculates the remainder of a 64-bit signed integer division.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit signed dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit signed divisor.
+ *
+ * @return This routine returns the 64-bit signed remainder.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+LONGLONG
+_allrem(IN LONGLONG Dividend,
+        IN LONGLONG Divisor)
+{
+    LONGLONG Remainder;
+
+    /* Call the internal signed division routine and return the computed remainder */
+    RTL::Math::Divide64(Dividend, Divisor, &Remainder);
+    return Remainder;
+}
+
+/**
+ * Divides a 64-bit unsigned integer by a 64-bit unsigned integer.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit unsigned dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit unsigned divisor.
+ *
+ * @return This routine returns the 64-bit unsigned quotient.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+ULONGLONG
+_aulldiv(IN ULONGLONG Dividend,
+         IN ULONGLONG Divisor)
+{
+    /* Call the internal unsigned division routine and return the quotient */
+    return RTL::Math::DivideUnsigned64(Dividend, Divisor, NULLPTR);
+}
+
+/**
+ * Divides a 64-bit unsigned integer by a 64-bit unsigned integer and retrieves the remainder.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit unsigned dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit unsigned divisor.
+ *
+ * @param Remainder
+ *        Supplies a pointer to a variable that receives the 64-bit unsigned remainder.
+ *
+ * @return This routine returns the 64-bit unsigned quotient.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+ULONGLONG
+_aulldvrm(ULONGLONG Dividend,
+          ULONGLONG Divisor,
+          PULONGLONG Remainder)
+{
+    /* Call the internal unsigned division routine to compute both quotient and remainder */
+    return RTL::Math::DivideUnsigned64(Dividend, Divisor, Remainder);
+}
+
+/**
+ * Calculates the remainder of a 64-bit unsigned integer division.
+ *
+ * @param Dividend
+ *        Supplies the 64-bit unsigned dividend.
+ *
+ * @param Divisor
+ *        Supplies the 64-bit unsigned divisor.
+ *
+ * @return This routine returns the 64-bit unsigned remainder.
+ *
+ * @since XT 1.0
+ */
+XTCLINK
+XTCDECL
+ULONGLONG
+_aullrem(IN ULONGLONG Dividend,
+         IN ULONGLONG Divisor)
+{
+    ULONGLONG Remainder;
+
+    /* Call the internal unsigned division routine and return the computed remainder */
+    RTL::Math::DivideUnsigned64(Dividend, Divisor, &Remainder);
+    return Remainder;
+}