MdePkg/BaseLib: Add one wrapper on RdRand access for parameter check.

Add one wrapper implementation over assembly RdRand access to check
possible NULL parameter, for better alignment with comment description.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

9 files changed, 188 insertions, 61 deletions

diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 1ffe870e7e..320ac457ea 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -428,6 +428,7 @@
   X86EnablePaging32.c

   X86DisablePaging64.c

   X86DisablePaging32.c

+  X86RdRand.c

 

 [Sources.X64]

   X64/Thunk16.nasm

@@ -752,6 +753,7 @@
   X86EnablePaging32.c

   X86DisablePaging64.c

   X86DisablePaging32.c

+  X86RdRand.c

   X64/GccInline.c | GCC

   X64/Thunk16.S | XCODE 

   X64/SwitchStack.nasm| GCC

diff --git a/MdePkg/Library/BaseLib/BaseLibInternals.h b/MdePkg/Library/BaseLib/BaseLibInternals.h
index fe416a0c38..a8f712b1ad 100644
--- a/MdePkg/Library/BaseLib/BaseLibInternals.h
+++ b/MdePkg/Library/BaseLib/BaseLibInternals.h
@@ -1,7 +1,7 @@
 /** @file

   Declaration of internal functions in BaseLib.

 

-  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

+  Copyright (c) 2006 - 2016, 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

@@ -728,6 +728,52 @@ InternalX86DisablePaging64 (
   IN      UINT32                    NewStack

   );

 

+/**

+  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

+InternalX86RdRand16 (

+  OUT     UINT16                    *Rand

+  );

+

+/**

+  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

+InternalX86RdRand32 (

+  OUT     UINT32                    *Rand

+  );

+

+/**

+  Generates a 64-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

+InternalX86RdRand64  (

+  OUT     UINT64                    *Rand

+  );

+

 

 #elif defined (MDE_CPU_IPF)

 //

diff --git a/MdePkg/Library/BaseLib/Ia32/RdRand.S b/MdePkg/Library/BaseLib/Ia32/RdRand.S
index 503f65a721..d00075afe7 100644
--- a/MdePkg/Library/BaseLib/Ia32/RdRand.S
+++ b/MdePkg/Library/BaseLib/Ia32/RdRand.S
@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------ ;

-# Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) 2015 - 2016, 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

@@ -24,10 +24,10 @@
 //  Generates a 16 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand16)

-ASM_PFX(AsmRdRand16):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand16)

+ASM_PFX(InternalX86RdRand16):

     .byte  0x0f, 0xc7, 0xf0        // rdrand r16: "0f c7 /6  ModRM:r/m(w)"

     jc     rn16_ok                 // jmp if CF=1

     xor    %eax, %eax              // reg=0 if CF=0

@@ -42,10 +42,10 @@ rn16_ok:
 //  Generates a 32 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand32)

-ASM_PFX(AsmRdRand32):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand32)

+ASM_PFX(InternalX86RdRand32):

     .byte  0x0f, 0xc7, 0xf0        // rdrand r32: "0f c7 /6  ModRM:r/m(w)"

     jc     rn32_ok                 // jmp if CF=1

     xor    %eax, %eax              // reg=0 if CF=0

@@ -60,10 +60,10 @@ rn32_ok:
 //  Generates a 64 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand64)

-ASM_PFX(AsmRdRand64):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand64)

+ASM_PFX(InternalX86RdRand64):

     .byte  0x0f, 0xc7, 0xf0        // rdrand r32: "0f c7 /6  ModRM:r/m(w)"

     jnc    rn64_ret                // jmp if CF=0

     mov    0x4(%esp), %edx

diff --git a/MdePkg/Library/BaseLib/Ia32/RdRand.asm b/MdePkg/Library/BaseLib/Ia32/RdRand.asm
index 21349b0918..cb4e811098 100644
--- a/MdePkg/Library/BaseLib/Ia32/RdRand.asm
+++ b/MdePkg/Library/BaseLib/Ia32/RdRand.asm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2015 - 2016, 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

@@ -30,9 +30,9 @@
 ;  Generates a 16 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 ;------------------------------------------------------------------------------

-AsmRdRand16  PROC

+InternalX86RdRand16  PROC

     ; rdrand   ax                  ; generate a 16 bit RN into ax

                                    ; CF=1 if RN generated ok, otherwise CF=0

     db     0fh, 0c7h, 0f0h         ; rdrand r16: "0f c7 /6  ModRM:r/m(w)"

@@ -44,15 +44,15 @@ rn16_ok:
     mov    [edx], ax

     mov    eax,  1

     ret

-AsmRdRand16 ENDP

+InternalX86RdRand16 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);

+;  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 ;------------------------------------------------------------------------------

-AsmRdRand32  PROC

+InternalX86RdRand32  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)"

@@ -64,15 +64,15 @@ rn32_ok:
     mov    [edx], eax

     mov    eax,  1

     ret

-AsmRdRand32 ENDP

+InternalX86RdRand32 ENDP

 

 ;------------------------------------------------------------------------------

 ;  Generates a 64 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);

 ;------------------------------------------------------------------------------

-AsmRdRand64  PROC

+InternalX86RdRand64  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)"

@@ -89,6 +89,6 @@ AsmRdRand64  PROC
 rn64_ret:

     xor    eax, eax

     ret                            ; return with failure status

-AsmRdRand64 ENDP

+InternalX86RdRand64 ENDP

 

     END

diff --git a/MdePkg/Library/BaseLib/Ia32/RdRand.nasm b/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
index 1365dfcdbb..64e8cdbda4 100644
--- a/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
+++ b/MdePkg/Library/BaseLib/Ia32/RdRand.nasm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2015 - 2016, 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

@@ -27,10 +27,10 @@ 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);

+;  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand16)

-ASM_PFX(AsmRdRand16):

+global ASM_PFX(InternalX86RdRand16)

+ASM_PFX(InternalX86RdRand16):

     ; rdrand   ax                  ; generate a 16 bit RN into ax

                                    ; CF=1 if RN generated ok, otherwise CF=0

     db     0xf, 0xc7, 0xf0         ; rdrand r16: "0f c7 /6  ModRM:r/m(w)"

@@ -47,10 +47,10 @@ rn16_ok:
 ;  Generates a 32 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand32)

-ASM_PFX(AsmRdRand32):

+global ASM_PFX(InternalX86RdRand32)

+ASM_PFX(InternalX86RdRand32):

     ; 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)"

@@ -67,10 +67,10 @@ rn32_ok:
 ;  Generates a 64 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand64)

-ASM_PFX(AsmRdRand64):

+global ASM_PFX(InternalX86RdRand64)

+ASM_PFX(InternalX86RdRand64):

     ; 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)"

diff --git a/MdePkg/Library/BaseLib/X64/RdRand.S b/MdePkg/Library/BaseLib/X64/RdRand.S
index 49b50e6901..55724c0868 100644
--- a/MdePkg/Library/BaseLib/X64/RdRand.S
+++ b/MdePkg/Library/BaseLib/X64/RdRand.S
@@ -1,5 +1,5 @@
 #------------------------------------------------------------------------------ ;

-# Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) 2015 - 2016, 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

@@ -24,10 +24,10 @@
 //  Generates a 16 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand16)

-ASM_PFX(AsmRdRand16):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand16)

+ASM_PFX(InternalX86RdRand16):

     .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

@@ -41,10 +41,10 @@ rn16_ok:
 //  Generates a 32 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand32)

-ASM_PFX(AsmRdRand32):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand32)

+ASM_PFX(InternalX86RdRand32):

     .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

@@ -58,10 +58,10 @@ rn32_ok:
 //  Generates a 64 bit random number through RDRAND instruction.

 //  Return TRUE if Rand generated successfully, or FALSE if not.

 //

-//  BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);

+//  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);

 //------------------------------------------------------------------------------

-ASM_GLOBAL ASM_PFX(AsmRdRand64)

-ASM_PFX(AsmRdRand64):

+ASM_GLOBAL ASM_PFX(InternalX86RdRand64)

+ASM_PFX(InternalX86RdRand64):

     .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

diff --git a/MdePkg/Library/BaseLib/X64/RdRand.asm b/MdePkg/Library/BaseLib/X64/RdRand.asm
index 370cdb607a..8e2074e2d5 100644
--- a/MdePkg/Library/BaseLib/X64/RdRand.asm
+++ b/MdePkg/Library/BaseLib/X64/RdRand.asm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2015 - 2016, 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

@@ -27,9 +27,9 @@
 ;  Generates a 16 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 ;------------------------------------------------------------------------------

-AsmRdRand16  PROC

+InternalX86RdRand16  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)"

@@ -40,15 +40,15 @@ rn16_ok:
     mov    [rcx], ax

     mov    rax,  1

     ret

-AsmRdRand16 ENDP

+InternalX86RdRand16 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);

+;  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 ;------------------------------------------------------------------------------

-AsmRdRand32  PROC

+InternalX86RdRand32  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)"

@@ -59,15 +59,15 @@ rn32_ok:
     mov    [rcx], eax

     mov    rax,  1

     ret

-AsmRdRand32 ENDP

+InternalX86RdRand32 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);

+;  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Random);

 ;------------------------------------------------------------------------------

-AsmRdRand64  PROC

+InternalX86RdRand64  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)"

@@ -78,6 +78,6 @@ rn64_ok:
     mov    [rcx], rax

     mov    rax, 1

     ret

-AsmRdRand64 ENDP

+InternalX86RdRand64 ENDP

 

     END

diff --git a/MdePkg/Library/BaseLib/X64/RdRand.nasm b/MdePkg/Library/BaseLib/X64/RdRand.nasm
index f6d83a3a10..b9050d287b 100644
--- a/MdePkg/Library/BaseLib/X64/RdRand.nasm
+++ b/MdePkg/Library/BaseLib/X64/RdRand.nasm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2015 - 2016, 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

@@ -28,10 +28,10 @@
 ;  Generates a 16 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand16)

-ASM_PFX(AsmRdRand16):

+global ASM_PFX(InternalX86RdRand16)

+ASM_PFX(InternalX86RdRand16):

     ; 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)"

@@ -47,10 +47,10 @@ rn16_ok:
 ;  Generates a 32 bit random number through RDRAND instruction.

 ;  Return TRUE if Rand generated successfully, or FALSE if not.

 ;

-;  BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);

+;  BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand32)

-ASM_PFX(AsmRdRand32):

+global ASM_PFX(InternalX86RdRand32)

+ASM_PFX(InternalX86RdRand32):

     ; 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)"

@@ -66,10 +66,10 @@ rn32_ok:
 ;  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);

+;  BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Random);

 ;------------------------------------------------------------------------------

-global ASM_PFX(AsmRdRand64)

-ASM_PFX(AsmRdRand64):

+global ASM_PFX(InternalX86RdRand64)

+ASM_PFX(InternalX86RdRand64):

     ; 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)"

diff --git a/MdePkg/Library/BaseLib/X86RdRand.c b/MdePkg/Library/BaseLib/X86RdRand.c
new file mode 100644
index 0000000000..36d5457b48
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X86RdRand.c
@@ -0,0 +1,79 @@
+/** @file

+  IA-32/x64 AsmRdRandxx()

+  Generates random number through CPU RdRand instruction.

+

+  Copyright (c) 2016, 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.

+

+**/

+

+#include "BaseLibInternals.h"

+

+/**

+  Generates a 16-bit random number through RDRAND instruction.

+

+  if Rand is NULL, then ASSERT().

+

+  @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

+AsmRdRand16 (

+  OUT     UINT16                    *Rand

+  )

+{

+  ASSERT (Rand != NULL);

+  return InternalX86RdRand16 (Rand);

+}

+

+/**

+  Generates a 32-bit random number through RDRAND instruction.

+

+  if Rand is NULL, then ASSERT().

+

+  @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

+AsmRdRand32 (

+  OUT     UINT32                    *Rand

+  )

+{

+  ASSERT (Rand != NULL);

+  return InternalX86RdRand32 (Rand);

+}

+

+/**

+  Generates a 64-bit random number through RDRAND instruction.

+

+  if Rand is NULL, then ASSERT().

+

+  @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

+AsmRdRand64  (

+  OUT     UINT64                    *Rand

+  )

+{

+  ASSERT (Rand != NULL);

+  return InternalX86RdRand64 (Rand);

+}