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9344f09215
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: Liming Gao <liming.gao@intel.com>
85 lines
3.2 KiB
NASM
85 lines
3.2 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2015 - 2016, 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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; RdRand.nasm
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;
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; Abstract:
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;
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; Generates random number through CPU RdRand instruction under 32-bit platform.
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; Generates a 16 bit random number through RDRAND instruction.
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; Return TRUE if Rand generated successfully, or FALSE if not.
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;
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; BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalX86RdRand16)
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ASM_PFX(InternalX86RdRand16):
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; rdrand ax ; generate a 16 bit RN into ax
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; CF=1 if RN generated ok, otherwise CF=0
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db 0xf, 0xc7, 0xf0 ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"
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jc rn16_ok ; jmp if CF=1
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xor eax, eax ; reg=0 if CF=0
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ret ; return with failure status
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rn16_ok:
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mov edx, dword [esp + 4]
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mov [edx], ax
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mov eax, 1
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ret
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;------------------------------------------------------------------------------
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; Generates a 32 bit random number through RDRAND instruction.
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; Return TRUE if Rand generated successfully, or FALSE if not.
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;
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; BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalX86RdRand32)
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ASM_PFX(InternalX86RdRand32):
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; rdrand eax ; generate a 32 bit RN into eax
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; CF=1 if RN generated ok, otherwise CF=0
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db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
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jc rn32_ok ; jmp if CF=1
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xor eax, eax ; reg=0 if CF=0
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ret ; return with failure status
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rn32_ok:
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mov edx, dword [esp + 4]
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mov [edx], eax
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mov eax, 1
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ret
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;------------------------------------------------------------------------------
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; Generates a 64 bit random number through RDRAND instruction.
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; Return TRUE if Rand generated successfully, or FALSE if not.
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;
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; BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalX86RdRand64)
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ASM_PFX(InternalX86RdRand64):
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; rdrand eax ; generate a 32 bit RN into eax
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; CF=1 if RN generated ok, otherwise CF=0
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db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
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jnc rn64_ret ; jmp if CF=0
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mov edx, dword [esp + 4]
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mov [edx], eax
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db 0xf, 0xc7, 0xf0 ; generate another 32 bit RN
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jnc rn64_ret ; jmp if CF=0
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mov [edx + 4], eax
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mov eax, 1
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ret
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rn64_ret:
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xor eax, eax
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ret ; return with failure status
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