MdePkg BaseLib: Convert X64/RdRand.asm to NASM
The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/RdRand.asm to X64/RdRand.nasm
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 51e3103..26f6b10 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -447,6 +447,7 @@
X64/CpuBreakpoint.c | MSFT
X64/WriteMsr64.c | MSFT
X64/ReadMsr64.c | MSFT
+ X64/RdRand.nasm| MSFT
X64/RdRand.asm | MSFT
X64/CpuPause.asm | MSFT
X64/EnableDisableInterrupts.asm | MSFT
@@ -520,6 +521,7 @@
X64/CpuBreakpoint.asm | INTEL
X64/WriteMsr64.asm | INTEL
X64/ReadMsr64.asm | INTEL
+ X64/RdRand.nasm| INTEL
X64/RdRand.asm | INTEL
X64/CpuPause.asm | INTEL
X64/EnableDisableInterrupts.asm | INTEL
@@ -626,6 +628,7 @@
X64/EnableCache.S | GCC
X64/DisableCache.nasm| GCC
X64/DisableCache.S | GCC
+ X64/RdRand.nasm| GCC
X64/RdRand.S | GCC
ChkStkGcc.c | GCC
diff --git a/MdePkg/Library/BaseLib/X64/RdRand.nasm b/MdePkg/Library/BaseLib/X64/RdRand.nasm
new file mode 100644
index 0000000..f6d83a3
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/RdRand.nasm
@@ -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.nasm
+;
+; Abstract:
+;
+; Generates random number through CPU RdRand instruction under 64-bit platform.
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; Generates a 16 bit random number through RDRAND instruction.
+; Return TRUE if Rand generated successfully, or FALSE if not.
+;
+; BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmRdRand16)
+ASM_PFX(AsmRdRand16):
+ ; rdrand ax ; generate a 16 bit RN into eax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 0xf, 0xc7, 0xf0 ; 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
+
+;------------------------------------------------------------------------------
+; Generates a 32 bit random number through RDRAND instruction.
+; Return TRUE if Rand generated successfully, or FALSE if not.
+;
+; BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmRdRand32)
+ASM_PFX(AsmRdRand32):
+ ; rdrand eax ; generate a 32 bit RN into eax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 0xf, 0xc7, 0xf0 ; 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
+
+;------------------------------------------------------------------------------
+; 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);
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmRdRand64)
+ASM_PFX(AsmRdRand64):
+ ; rdrand rax ; generate a 64 bit RN into rax,
+ ; CF=1 if RN generated ok, otherwise CF=0
+ db 0x48, 0xf, 0xc7, 0xf0 ; 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
+
