60 lines
1.8 KiB
NASM
60 lines
1.8 KiB
NASM
;;@file
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; Generate a random number in 32 bit environment
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;
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;@copyright
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; Copyright (c) 2014 Intel Corporation. All rights reserved
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; This software and associated documentation (if any) is furnished
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; under a license and may only be used or copied in accordance
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; with the terms of the license. Except as permitted by the
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; license, no part of this software or documentation may be
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; reproduced, stored in a retrieval system, or transmitted in any
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; form or by any means without the express written consent of
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; Intel Corporation.
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; This file contains an 'Intel Peripheral Driver' and is uniquely
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; identified as "Intel Reference Module" and is licensed for Intel
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; CPUs and chipsets under the terms of your license agreement with
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; Intel or your vendor. This file may be modified by the user, subject
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; to additional terms of the license agreement.
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;
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;@par Specification Reference:
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;;
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.686P
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.model flat, C
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.code
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;
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; Generate a 16 bit random number
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;
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GetRandomNumber16 PROC
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; rdrand ax ; generate a 16 bit RN into eax, CF=1 if RN generated ok, otherwise CF=0
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clc
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@@:
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db 0fh,0c7h,0f0h ; rdrand r16: "0F C7 /6 ModRM:r/m(w)"
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jnc @b ; CF will be set if valid number was generated
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ret
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GetRandomNumber16 ENDP
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;
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; Generate a 32 bit random number
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;
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GetRandomNumber32 PROC
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; rdrand eax ; generate a 32 bit RN into eax, CF=1 if RN generated ok, otherwise CF=0
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clc
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@@:
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db 0fh,0c7h,0f0h ; rdrand r32: "0F C7 /6 ModRM:r/m(w)"
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jnc @b ; CF will be set if valid number was generated
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ret
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GetRandomNumber32 ENDP
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;
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; Generate a 64 bit random number
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;
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GetRandomNumber64 PROC
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clc
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xor eax, eax ; RN return 0
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ret
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GetRandomNumber64 ENDP
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END
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