projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 050a8bf1 JJ |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 9ec9a7a5 | 3 | ; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>\r |
| 9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 050a8bf1 JJ |
5 | ;\r |
| 6 | ; Module Name:\r | |
| 7 | ;\r | |
| 8 | ; RdRand.nasm\r | |
| 9 | ;\r | |
| 10 | ; Abstract:\r | |
| 11 | ;\r | |
| 12 | ; Generates random number through CPU RdRand instruction under 64-bit platform.\r | |
| 13 | ;\r | |
| 14 | ; Notes:\r | |
| 15 | ;\r | |
| 16 | ;------------------------------------------------------------------------------\r | |
| 17 | \r | |
| 18 | DEFAULT REL\r | |
| 19 | SECTION .text\r | |
| 20 | \r | |
| 21 | ;------------------------------------------------------------------------------\r | |
| 22 | ; Generates a 16 bit random number through RDRAND instruction.\r | |
| 23 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 24 | ;\r | |
| 9ec9a7a5 | 25 | ; BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);\r |
| 050a8bf1 | 26 | ;------------------------------------------------------------------------------\r |
| 9ec9a7a5 QL |
27 | global ASM_PFX(InternalX86RdRand16)\r |
| 28 | ASM_PFX(InternalX86RdRand16):\r | |
| 050a8bf1 JJ |
29 | ; rdrand ax ; generate a 16 bit RN into eax,\r |
| 30 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 31 | db 0xf, 0xc7, 0xf0 ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"\r | |
| 32 | jc rn16_ok ; jmp if CF=1\r | |
| 33 | xor rax, rax ; reg=0 if CF=0\r | |
| 34 | ret ; return with failure status\r | |
| 35 | rn16_ok:\r | |
| 36 | mov [rcx], ax\r | |
| 37 | mov rax, 1\r | |
| 38 | ret\r | |
| 39 | \r | |
| 40 | ;------------------------------------------------------------------------------\r | |
| 41 | ; Generates a 32 bit random number through RDRAND instruction.\r | |
| 42 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 43 | ;\r | |
| 9ec9a7a5 | 44 | ; BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);\r |
| 050a8bf1 | 45 | ;------------------------------------------------------------------------------\r |
| 9ec9a7a5 QL |
46 | global ASM_PFX(InternalX86RdRand32)\r |
| 47 | ASM_PFX(InternalX86RdRand32):\r | |
| 050a8bf1 JJ |
48 | ; rdrand eax ; generate a 32 bit RN into eax,\r |
| 49 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 50 | db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"\r | |
| 51 | jc rn32_ok ; jmp if CF=1\r | |
| 52 | xor rax, rax ; reg=0 if CF=0\r | |
| 53 | ret ; return with failure status\r | |
| 54 | rn32_ok:\r | |
| 55 | mov [rcx], eax\r | |
| 56 | mov rax, 1\r | |
| 57 | ret\r | |
| 58 | \r | |
| 59 | ;------------------------------------------------------------------------------\r | |
| 60 | ; Generates a 64 bit random number through one RDRAND instruction.\r | |
| 61 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 62 | ;\r | |
| 9ec9a7a5 | 63 | ; BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Random);\r |
| 050a8bf1 | 64 | ;------------------------------------------------------------------------------\r |
| 9ec9a7a5 QL |
65 | global ASM_PFX(InternalX86RdRand64)\r |
| 66 | ASM_PFX(InternalX86RdRand64):\r | |
| 050a8bf1 JJ |
67 | ; rdrand rax ; generate a 64 bit RN into rax,\r |
| 68 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 69 | db 0x48, 0xf, 0xc7, 0xf0 ; rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"\r | |
| 70 | jc rn64_ok ; jmp if CF=1\r | |
| 71 | xor rax, rax ; reg=0 if CF=0\r | |
| 72 | ret ; return with failure status\r | |
| 73 | rn64_ok:\r | |
| 74 | mov [rcx], rax\r | |
| 75 | mov rax, 1\r | |
| 76 | ret\r | |
| 77 | \r |