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https://github.com/CloverHackyColor/CloverBootloader.git
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45 lines
1.2 KiB
NASM
45 lines
1.2 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; RRotU64.nasm
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;
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; Abstract:
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;
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; 64-bit right rotation for Ia32
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; UINT64
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; EFIAPI
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; InternalMathRRotU64 (
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; IN UINT64 Operand,
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; IN UINTN Count
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalMathRRotU64)
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ASM_PFX(InternalMathRRotU64):
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push ebx
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mov cl, [esp + 16]
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mov eax, [esp + 8]
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mov edx, [esp + 12]
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shrd ebx, eax, cl
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shrd eax, edx, cl
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rol ebx, cl
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shrd edx, ebx, cl
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test cl, 32 ; Count >= 32?
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jz .0
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mov ecx, eax ; switch eax & edx if Count >= 32
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mov eax, edx
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mov edx, ecx
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.0:
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pop ebx
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ret
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