diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c b/roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c new file mode 100644 index 000000000..35d843705 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseLib/Ia32/RShiftU64.c @@ -0,0 +1,45 @@ +/** @file
+ 64-bit logical right shift function for IA-32
+
+ Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+/**
+ Shifts a 64-bit integer right between 0 and 63 bits. This high bits
+ are filled with zeros. The shifted value is returned.
+
+ This function shifts the 64-bit value Operand to the right by Count bits. The
+ high Count bits are set to zero. The shifted value is returned.
+
+ @param Operand The 64-bit operand to shift right.
+ @param Count The number of bits to shift right.
+
+ @return Operand >> Count
+
+**/
+UINT64
+EFIAPI
+InternalMathRShiftU64 (
+ IN UINT64 Operand,
+ IN UINTN Count
+ )
+{
+ _asm {
+ mov cl, byte ptr [Count]
+ xor edx, edx
+ mov eax, dword ptr [Operand + 4]
+ test cl, 32
+ jnz L0
+ mov edx, eax
+ mov eax, dword ptr [Operand + 0]
+L0:
+ shrd eax, edx, cl
+ shr edx, cl
+ }
+}
+
|