2009f6b4c5
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
52 lines
1013 B
C
52 lines
1013 B
C
/** @file
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64-bit Math Worker Function.
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The 32-bit versions of C compiler generate calls to library routines
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to handle 64-bit math. These functions use non-standard calling conventions.
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Copyright (c) 2014, 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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/*
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* Shifts a 64-bit unsigned value right by a certain number of bits.
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*/
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__declspec(naked) void __cdecl _aullshr (void)
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{
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_asm {
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;
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; Checking: Only handle 64bit shifting or more
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;
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cmp cl, 64
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jae _Exit
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;
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; Handle shifting between 0 and 31 bits
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;
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cmp cl, 32
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jae More32
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shrd eax, edx, cl
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shr edx, cl
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ret
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;
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; Handle shifting of 32-63 bits
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;
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More32:
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mov eax, edx
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xor edx, edx
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and cl, 31
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shr eax, cl
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ret
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;
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; Invalid number (less then 32bits), return 0
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;
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_Exit:
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xor eax, eax
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xor edx, edx
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ret
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}
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}
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