mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-27 12:15:19 +01:00
78 lines
3.0 KiB
NASM
78 lines
3.0 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; 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 InternalX86RdRand16 (UINT16 *Rand);
|
|
;------------------------------------------------------------------------------
|
|
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)"
|
|
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 InternalX86RdRand32 (UINT32 *Rand);
|
|
;------------------------------------------------------------------------------
|
|
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)"
|
|
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 InternalX86RdRand64 (UINT64 *Random);
|
|
;------------------------------------------------------------------------------
|
|
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)"
|
|
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
|
|
|