mirror of https://github.com/acidanthera/audk.git
84 lines
3.3 KiB
NASM
84 lines
3.3 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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 64-bit platform.
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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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 AsmRdRand16 (UINT16 *Rand);
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmRdRand16)
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ASM_PFX(AsmRdRand16):
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; rdrand ax ; generate a 16 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 r16: "0f c7 /6 ModRM:r/m(w)"
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jc rn16_ok ; jmp if CF=1
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xor rax, rax ; 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 [rcx], ax
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mov rax, 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 AsmRdRand32 (UINT32 *Rand);
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmRdRand32)
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ASM_PFX(AsmRdRand32):
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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 rax, rax ; 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 [rcx], eax
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mov rax, 1
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ret
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;------------------------------------------------------------------------------
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; Generates a 64 bit random number through one 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 AsmRdRand64 (UINT64 *Random);
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmRdRand64)
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ASM_PFX(AsmRdRand64):
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; rdrand rax ; generate a 64 bit RN into rax,
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; CF=1 if RN generated ok, otherwise CF=0
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db 0x48, 0xf, 0xc7, 0xf0 ; rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
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jc rn64_ok ; jmp if CF=1
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xor rax, rax ; reg=0 if CF=0
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ret ; return with failure status
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rn64_ok:
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mov [rcx], rax
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mov rax, 1
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ret
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