mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-30 12:43:41 +01:00
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/** @file
|
|
64-bit left rotation for Ia32
|
|
|
|
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
|
|
|
|
|
|
/**
|
|
Rotates a 64-bit integer left between 0 and 63 bits, filling
|
|
the low bits with the high bits that were rotated.
|
|
|
|
This function rotates the 64-bit value Operand to the left by Count bits. The
|
|
low Count bits are fill with the high Count bits of Operand. The rotated
|
|
value is returned.
|
|
|
|
@param Operand The 64-bit operand to rotate left.
|
|
@param Count The number of bits to rotate left.
|
|
|
|
@return Operand <<< Count
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
InternalMathLRotU64 (
|
|
IN UINT64 Operand,
|
|
IN UINTN Count
|
|
)
|
|
{
|
|
_asm {
|
|
mov cl, byte ptr [Count]
|
|
mov edx, dword ptr [Operand + 4]
|
|
mov eax, dword ptr [Operand + 0]
|
|
shld ebx, edx, cl
|
|
shld edx, eax, cl
|
|
ror ebx, cl
|
|
shld eax, ebx, cl
|
|
test cl, 32 ; Count >= 32?
|
|
jz L0
|
|
mov ecx, eax
|
|
mov eax, edx
|
|
mov edx, ecx
|
|
L0:
|
|
}
|
|
}
|
|
|