From 031e5cce385d3f96b1caa1d53495332a7eb03749 Mon Sep 17 00:00:00 2001
From: Steve McIntyre <steve@einval.com>
Date: Tue, 23 Mar 2021 23:49:46 +0000
Subject: New upstream version 15.3

---
 gnu-efi/lib/arm/math.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 gnu-efi/lib/arm/math.c

(limited to 'gnu-efi/lib/arm/math.c')

diff --git a/gnu-efi/lib/arm/math.c b/gnu-efi/lib/arm/math.c
new file mode 100644
index 00000000..4793ae2f
--- /dev/null
+++ b/gnu-efi/lib/arm/math.c
@@ -0,0 +1,67 @@
+/*
+ * Copright (C) 2014 Linaro Ltd.
+ * Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice and this list of conditions, without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any later version.
+ */
+
+#include "lib.h"
+
+UINT64
+LShiftU64 (
+    IN UINT64   Operand,
+    IN UINTN    Count
+    )
+// Left shift 64bit by 32bit and get a 64bit result
+{
+    return Operand << Count;
+}
+
+UINT64
+RShiftU64 (
+    IN UINT64   Operand,
+    IN UINTN    Count
+    )
+// Right shift 64bit by 32bit and get a 64bit result
+{
+    return Operand >> Count;
+}
+
+
+UINT64
+MultU64x32 (
+    IN UINT64   Multiplicand,
+    IN UINTN    Multiplier
+    )
+// Multiply 64bit by 32bit and get a 64bit result
+{
+    return Multiplicand * Multiplier;
+}
+
+UINT64
+DivU64x32 (
+    IN UINT64   Dividend,
+    IN UINTN    Divisor,
+    OUT UINTN   *Remainder OPTIONAL
+    )
+{
+    /*
+     * GCC turns a division into a multiplication and shift with precalculated
+     * constants if the divisor is constant and the dividend fits into a 32 bit
+     * variable. Otherwise, it will turn this into calls into the 32-bit div
+     * library functions.
+     */
+    if (Remainder)
+        *Remainder = Dividend % Divisor;
+    return Dividend / Divisor;
+}
-- 
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