1 files changed, 69 insertions, 0 deletions
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/IA32/GccRdRand.c b/SecurityPkg/RandomNumberGenerator/RngDxe/IA32/GccRdRand.c
new file mode 100644
index 000000000..f42302afe
--- /dev/null
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/IA32/GccRdRand.c
@@ -0,0 +1,69 @@
+/** @file
+  RDRAND Support Routines for GCC environment.
+
+Copyright (c) 2013, 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.
+
+**/
+
+/**
+  Generates a 16-bit random number through RDRAND instruction.
+
+  @param[out]  Rand          Buffer pointer to store the random result.
+
+  @retval TRUE               RDRAND call was successful.
+  @retval FALSE              Failed attempts to call RDRAND.
+
+**/
+BOOLEAN
+EFIAPI
+RdRand16Step (
+  OUT UINT16       *Rand
+  )
+{
+  UINT8  Carry;
+
+  //
+  // Uses byte code for RDRAND instruction,
+  // in case that GCC version has no direct support on RDRAND assembly.
+  //
+  __asm__ __volatile__ (
+    ".byte 0x66; .byte 0x0f; .byte 0xc7; .byte 0xf0; setc %1"
+    :"=a"  (*Rand), 
+     "=qm" (Carry)
+    ); 
+
+  return (BOOLEAN) Carry;
+}
+
+/**
+  Generates a 32-bit random number through RDRAND instruction.
+
+  @param[out]  Rand          Buffer pointer to store the random result.
+
+  @retval TRUE               RDRAND call was successful.
+  @retval FALSE              Failed attempts to call RDRAND.
+
+**/
+BOOLEAN
+EFIAPI
+RdRand32Step (
+  OUT UINT32       *Rand
+  )
+{
+  UINT8  Carry;
+
+  __asm__ __volatile__ (
+    ".byte 0x0f; .byte 0xc7; .byte 0xf0; setc %1"
+    :"=a"  (*Rand), 
+     "=qm" (Carry)
+    );
+
+  return (BOOLEAN) Carry;
+}
+\ No newline at end of file