projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3cfc7813 QL |
1 | #------------------------------------------------------------------------------ ;\r |
| 2 | # Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
| 3 | # This program and the accompanying materials\r | |
| 4 | # are licensed and made available under the terms and conditions of the BSD License\r | |
| 5 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 6 | # http://opensource.org/licenses/bsd-license.php.\r | |
| 7 | #\r | |
| 8 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 9 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 10 | #\r | |
| 11 | # Module Name:\r | |
| 12 | #\r | |
| 13 | # RdRand.S\r | |
| 14 | #\r | |
| 15 | # Abstract:\r | |
| 16 | #\r | |
| 17 | # Generates random number through CPU RdRand instruction under 64-bit platform.\r | |
| 18 | #\r | |
| 19 | # Notes:\r | |
| 20 | #\r | |
| 21 | #------------------------------------------------------------------------------\r | |
| 22 | \r | |
| 23 | //------------------------------------------------------------------------------\r | |
| 24 | // Generates a 16 bit random number through RDRAND instruction.\r | |
| 25 | // Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 26 | //\r | |
| 27 | // BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);\r | |
| 28 | //------------------------------------------------------------------------------\r | |
| 29 | ASM_GLOBAL ASM_PFX(AsmRdRand16)\r | |
| 30 | ASM_PFX(AsmRdRand16):\r | |
| 31 | .byte 0x0f, 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 %ax, (%rcx)\r | |
| 37 | mov $0x1, %rax\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 | |
| 44 | // BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);\r | |
| 45 | //------------------------------------------------------------------------------\r | |
| 46 | ASM_GLOBAL ASM_PFX(AsmRdRand32)\r | |
| 47 | ASM_PFX(AsmRdRand32):\r | |
| 48 | .byte 0x0f, 0xc7, 0xf0 // rdrand r32: "0f c7 /6 ModRM:r/m(w)"\r | |
| 49 | jc rn32_ok // jmp if CF=1\r | |
| 50 | xor %rax, %rax // reg=0 if CF=0\r | |
| 51 | ret // return with failure status\r | |
| 52 | rn32_ok:\r | |
| 53 | mov %eax, (%rcx)\r | |
| 54 | mov $0x1, %rax\r | |
| 55 | ret\r | |
| 56 | \r | |
| 57 | //------------------------------------------------------------------------------\r | |
| 58 | // Generates a 64 bit random number through RDRAND instruction.\r | |
| 59 | // Return TRUE if Rand generated successfully, or FALSE if not.\r | |
| 60 | //\r | |
| 61 | // BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);\r | |
| 62 | //------------------------------------------------------------------------------\r | |
| 63 | ASM_GLOBAL ASM_PFX(AsmRdRand64)\r | |
| 64 | ASM_PFX(AsmRdRand64):\r | |
| 65 | .byte 0x48, 0x0f, 0xc7, 0xf0 // rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"\r | |
| 66 | jc rn64_ok // jmp if CF=1\r | |
| 67 | xor %rax, %rax // reg=0 if CF=0\r | |
| 68 | ret // return with failure status\r | |
| 69 | rn64_ok:\r | |
| 70 | mov %rax, (%rcx)\r | |
| 71 | mov $0x1, %rax\r | |
| 72 | ret\r |