From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 14:33:42 +0000
Subject: Add submodule dependency files

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
---
 .../Library/IntrinsicLib/Ia32/MathRShiftU64.c      | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c

(limited to 'roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c')

diff --git a/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c b/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c
new file mode 100644
index 000000000..efa38983a
--- /dev/null
+++ b/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c
@@ -0,0 +1,51 @@
+/** @file
+  64-bit Math Worker Function.
+  The 32-bit versions of C compiler generate calls to library routines
+  to handle 64-bit math. These functions use non-standard calling conventions.
+
+Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+/*
+ * Shifts a 64-bit unsigned value right by a certain number of bits.
+ */
+__declspec(naked) void __cdecl _aullshr (void)
+{
+  _asm {
+    ;
+    ; Checking: Only handle 64bit shifting or more
+    ;
+    cmp     cl, 64
+    jae     _Exit
+
+    ;
+    ; Handle shifting between 0 and 31 bits
+    ;
+    cmp     cl, 32
+    jae     More32
+    shrd    eax, edx, cl
+    shr     edx, cl
+    ret
+
+    ;
+    ; Handle shifting of 32-63 bits
+    ;
+More32:
+    mov     eax, edx
+    xor     edx, edx
+    and     cl, 31
+    shr     eax, cl
+    ret
+
+    ;
+    ; Invalid number (less then 32bits), return 0
+    ;
+_Exit:
+    xor     eax, eax
+    xor     edx, edx
+    ret
+  }
+}
-- 
cgit