diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseLib/X64/RdRand.S | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/X64/RdRand.S')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/X64/RdRand.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/RdRand.S b/Core/MdePkg/Library/BaseLib/X64/RdRand.S new file mode 100644 index 0000000000..49b50e6901 --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/X64/RdRand.S @@ -0,0 +1,72 @@ +#------------------------------------------------------------------------------ ;
+# 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.S
+#
+# Abstract:
+#
+# Generates random number through CPU RdRand instruction under 64-bit platform.
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Generates a 16 bit random number through RDRAND instruction.
+// Return TRUE if Rand generated successfully, or FALSE if not.
+//
+// BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);
+//------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(AsmRdRand16)
+ASM_PFX(AsmRdRand16):
+ .byte 0x0f, 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 %ax, (%rcx)
+ mov $0x1, %rax
+ 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);
+//------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(AsmRdRand32)
+ASM_PFX(AsmRdRand32):
+ .byte 0x0f, 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 %eax, (%rcx)
+ mov $0x1, %rax
+ ret
+
+//------------------------------------------------------------------------------
+// Generates a 64 bit random number through RDRAND instruction.
+// Return TRUE if Rand generated successfully, or FALSE if not.
+//
+// BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);
+//------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(AsmRdRand64)
+ASM_PFX(AsmRdRand64):
+ .byte 0x48, 0x0f, 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 %rax, (%rcx)
+ mov $0x1, %rax
+ ret
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