mirror of https://github.com/acidanthera/audk.git
81 lines
3.2 KiB
ArmAsm
81 lines
3.2 KiB
ArmAsm
#------------------------------------------------------------------------------ ;
|
|
# 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
|
|
# 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 32-bit platform.
|
|
#
|
|
# Notes:
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Generates a 16 bit random number through RDRAND instruction.
|
|
// Return TRUE if Rand generated successfully, or FALSE if not.
|
|
//
|
|
// BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);
|
|
//------------------------------------------------------------------------------
|
|
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
|
|
ret // return with failure status
|
|
rn16_ok:
|
|
mov 0x4(%esp), %edx
|
|
mov %ax, (%edx)
|
|
mov $0x1, %eax
|
|
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);
|
|
//------------------------------------------------------------------------------
|
|
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
|
|
ret // return with failure status
|
|
rn32_ok:
|
|
mov 0x4(%esp), %edx
|
|
mov %eax, (%edx)
|
|
mov $0x1, %eax
|
|
ret
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Generates a 64 bit random number through RDRAND instruction.
|
|
// Return TRUE if Rand generated successfully, or FALSE if not.
|
|
//
|
|
// BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);
|
|
//------------------------------------------------------------------------------
|
|
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
|
|
mov %eax, (%edx)
|
|
|
|
.byte 0x0f, 0xc7, 0xf0 // generate another 32 bit RN
|
|
jnc rn64_ret // jmp if CF=0
|
|
mov %eax, 0x4(%edx)
|
|
|
|
mov $0x1, %eax
|
|
ret
|
|
rn64_ret:
|
|
xor %eax, %eax
|
|
ret // return with failure status
|