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| author | Qin Long <qin.long@intel.com> | 2015-09-21 05:53:52 +0000 |
|---|---|---|
| committer | qlong <qlong@Edk2> | 2015-09-21 05:53:52 +0000 |
| commit | 3cfc7813bb7e904c4a940d638facc10be5e22645 (patch) | |
| tree | 714169431ab0af3ca0faecb44e0faa212b2ffff4 /MdePkg/Library/BaseLib/X64/RdRand.asm | |
| parent | 82f3edf26a7f60e50b0133cdc5ec689d2b7f502e (diff) | |
| download | edk2-3cfc7813bb7e904c4a940d638facc10be5e22645.tar.gz edk2-3cfc7813bb7e904c4a940d638facc10be5e22645.tar.bz2 edk2-3cfc7813bb7e904c4a940d638facc10be5e22645.zip | |
MdePkg: Add CPU RdRand access APIs for random number generation
Add AsmRdRand16/32/64 APIs for RdRand instruction access to generate
high-quality random number.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18518 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/RdRand.asm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/RdRand.asm | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/RdRand.asm b/MdePkg/Library/BaseLib/X64/RdRand.asm new file mode 100644 index 0000000000..370cdb607a --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/RdRand.asm @@ -0,0 +1,83 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution. The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+; RdRand.asm
+;
+; Abstract:
+;
+; Generates random number through CPU RdRand instruction under 64-bit platform.
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ .code
+
+;------------------------------------------------------------------------------
+; Generates a 16 bit random number through RDRAND instruction.
+; Return TRUE if Rand generated successfully, or FALSE if not.
+;
+; BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);
+;------------------------------------------------------------------------------
+AsmRdRand16 PROC
+ ; rdrand ax ; generate a 16 bit RN into eax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 0fh, 0c7h, 0f0h ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"
+ jc rn16_ok ; jmp if CF=1
+ xor rax, rax ; reg=0 if CF=0
+ ret ; return with failure status
+rn16_ok:
+ mov [rcx], ax
+ mov rax, 1
+ ret
+AsmRdRand16 ENDP
+
+;------------------------------------------------------------------------------
+; Generates a 32 bit random number through RDRAND instruction.
+; Return TRUE if Rand generated successfully, or FALSE if not.
+;
+; BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);
+;------------------------------------------------------------------------------
+AsmRdRand32 PROC
+ ; rdrand eax ; generate a 32 bit RN into eax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 0fh, 0c7h, 0f0h ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"
+ jc rn32_ok ; jmp if CF=1
+ xor rax, rax ; reg=0 if CF=0
+ ret ; return with failure status
+rn32_ok:
+ mov [rcx], eax
+ mov rax, 1
+ ret
+AsmRdRand32 ENDP
+
+;------------------------------------------------------------------------------
+; Generates a 64 bit random number through one RDRAND instruction.
+; Return TRUE if Rand generated successfully, or FALSE if not.
+;
+; BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Random);
+;------------------------------------------------------------------------------
+AsmRdRand64 PROC
+ ; rdrand rax ; generate a 64 bit RN into rax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 048h, 0fh, 0c7h, 0f0h ; rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
+ jc rn64_ok ; jmp if CF=1
+ xor rax, rax ; reg=0 if CF=0
+ ret ; return with failure status
+rn64_ok:
+ mov [rcx], rax
+ mov rax, 1
+ ret
+AsmRdRand64 ENDP
+
+ END
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