projects / mirror_edk2.git / blame
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|---|---|---|
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1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | ; This program and the accompanying materials\r | |
| 5 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
| 6 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| 7 | ; http://opensource.org/licenses/bsd-license.php.\r | |
| 8 | ;\r | |
| 9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 11 | ;\r | |
| 12 | ; Module Name:\r | |
| 13 | ;\r | |
| 14 | ; RdRand.nasm\r | |
| 15 | ;\r | |
| 16 | ; Abstract:\r | |
| 17 | ;\r | |
| 18 | ; Generates random number through CPU RdRand instruction under 32-bit platform.\r | |
| 19 | ;\r | |
| 20 | ; Notes:\r | |
| 21 | ;\r | |
| 22 | ;------------------------------------------------------------------------------\r | |
| 23 | \r | |
| 24 | SECTION .text\r | |
| 25 | \r | |
| 26 | ;------------------------------------------------------------------------------\r | |
| 27 | ; Generates a 16 bit random number through RDRAND instruction.\r | |
| 28 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 29 | ;\r | |
| 30 | ; BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);\r | |
| 31 | ;------------------------------------------------------------------------------\r | |
| 32 | global ASM_PFX(AsmRdRand16)\r | |
| 33 | ASM_PFX(AsmRdRand16):\r | |
| 34 | ; rdrand ax ; generate a 16 bit RN into ax\r | |
| 35 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 36 | db 0xf, 0xc7, 0xf0 ; rdrand r16: "0f c7 /6 ModRM:r/m(w)"\r | |
| 37 | jc rn16_ok ; jmp if CF=1\r | |
| 38 | xor eax, eax ; reg=0 if CF=0\r | |
| 39 | ret ; return with failure status\r | |
| 40 | rn16_ok:\r | |
| 41 | mov edx, dword [esp + 4]\r | |
| 42 | mov [edx], ax\r | |
| 43 | mov eax, 1\r | |
| 44 | ret\r | |
| 45 | \r | |
| 46 | ;------------------------------------------------------------------------------\r | |
| 47 | ; Generates a 32 bit random number through RDRAND instruction.\r | |
| 48 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 49 | ;\r | |
| 50 | ; BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);\r | |
| 51 | ;------------------------------------------------------------------------------\r | |
| 52 | global ASM_PFX(AsmRdRand32)\r | |
| 53 | ASM_PFX(AsmRdRand32):\r | |
| 54 | ; rdrand eax ; generate a 32 bit RN into eax\r | |
| 55 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 56 | db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"\r | |
| 57 | jc rn32_ok ; jmp if CF=1\r | |
| 58 | xor eax, eax ; reg=0 if CF=0\r | |
| 59 | ret ; return with failure status\r | |
| 60 | rn32_ok:\r | |
| 61 | mov edx, dword [esp + 4]\r | |
| 62 | mov [edx], eax\r | |
| 63 | mov eax, 1\r | |
| 64 | ret\r | |
| 65 | \r | |
| 66 | ;------------------------------------------------------------------------------\r | |
| 67 | ; Generates a 64 bit random number through RDRAND instruction.\r | |
| 68 | ; Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 69 | ;\r | |
| 70 | ; BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);\r | |
| 71 | ;------------------------------------------------------------------------------\r | |
| 72 | global ASM_PFX(AsmRdRand64)\r | |
| 73 | ASM_PFX(AsmRdRand64):\r | |
| 74 | ; rdrand eax ; generate a 32 bit RN into eax\r | |
| 75 | ; CF=1 if RN generated ok, otherwise CF=0\r | |
| 76 | db 0xf, 0xc7, 0xf0 ; rdrand r32: "0f c7 /6 ModRM:r/m(w)"\r | |
| 77 | jnc rn64_ret ; jmp if CF=0\r | |
| 78 | mov edx, dword [esp + 4]\r | |
| 79 | mov [edx], eax\r | |
| 80 | \r | |
| 81 | db 0xf, 0xc7, 0xf0 ; generate another 32 bit RN\r | |
| 82 | jnc rn64_ret ; jmp if CF=0\r | |
| 83 | mov [edx + 4], eax\r | |
| 84 | \r | |
| 85 | mov eax, 1\r | |
| 86 | ret\r | |
| 87 | rn64_ret:\r | |
| 88 | xor eax, eax\r | |
| 89 | ret ; return with failure status\r | |
| 90 | \r |