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

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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>
This commit is contained in:
Qin Long
2016-11-04 15:31:28 +08:00
parent b3775af277
commit 9ec9a7a597
9 changed files with 188 additions and 61 deletions
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20
MdePkg/Library/BaseLib/X64/RdRand.asm
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@@ -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