mirror of https://github.com/acidanthera/audk.git
73 lines
2.9 KiB
ArmAsm
73 lines
2.9 KiB
ArmAsm
#------------------------------------------------------------------------------ ;
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# Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# RdRand.S
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#
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# Abstract:
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#
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# Generates random number through CPU RdRand instruction under 64-bit platform.
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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// Generates a 16 bit random number through RDRAND instruction.
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// Return TRUE if Rand generated successfully, or FALSE if not.
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//
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// BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);
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//------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(AsmRdRand16)
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ASM_PFX(AsmRdRand16):
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.byte 0x0f, 0xc7, 0xf0 // rdrand r16: "0f c7 /6 ModRM:r/m(w)"
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jc rn16_ok // jmp if CF=1
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xor %rax, %rax // reg=0 if CF=0
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ret // return with failure status
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rn16_ok:
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mov %ax, (%rcx)
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mov $0x1, %rax
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ret
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//------------------------------------------------------------------------------
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// Generates a 32 bit random number through RDRAND instruction.
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// Return TRUE if Rand generated successfully, or FALSE if not.
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//
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// BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);
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//------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(AsmRdRand32)
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ASM_PFX(AsmRdRand32):
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.byte 0x0f, 0xc7, 0xf0 // rdrand r32: "0f c7 /6 ModRM:r/m(w)"
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jc rn32_ok // jmp if CF=1
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xor %rax, %rax // reg=0 if CF=0
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ret // return with failure status
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rn32_ok:
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mov %eax, (%rcx)
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mov $0x1, %rax
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ret
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//------------------------------------------------------------------------------
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// Generates a 64 bit random number through RDRAND instruction.
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// Return TRUE if Rand generated successfully, or FALSE if not.
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//
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// BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);
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//------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(AsmRdRand64)
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ASM_PFX(AsmRdRand64):
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.byte 0x48, 0x0f, 0xc7, 0xf0 // rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
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jc rn64_ok // jmp if CF=1
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xor %rax, %rax // reg=0 if CF=0
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ret // return with failure status
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rn64_ok:
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mov %rax, (%rcx)
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mov $0x1, %rax
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ret
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