projects / mirror_edk2.git / blame
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|---|---|---|
| 41aa07b3 JJ |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2006, 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 | ; ReadDr4.Asm\r | |
| 15 | ;\r | |
| 16 | ; Abstract:\r | |
| 17 | ;\r | |
| 18 | ; AsmReadDr4 function\r | |
| 19 | ;\r | |
| 20 | ; Notes:\r | |
| 21 | ;\r | |
| 22 | ;------------------------------------------------------------------------------\r | |
| 23 | \r | |
| 24 | SECTION .text\r | |
| 25 | \r | |
| 26 | ;------------------------------------------------------------------------------\r | |
| 27 | ; UINTN\r | |
| 28 | ; EFIAPI\r | |
| 29 | ; AsmReadDr4 (\r | |
| 30 | ; VOID\r | |
| 31 | ; );\r | |
| 32 | ;------------------------------------------------------------------------------\r | |
| 33 | global ASM_PFX(AsmReadDr4)\r | |
| 34 | ASM_PFX(AsmReadDr4):\r | |
| 35 | ;\r | |
| 36 | ; DR4 is alias to DR6 only if DE (in CR4) is cleared. Otherwise, reading\r | |
| 37 | ; this register will cause a #UD exception.\r | |
| 38 | ;\r | |
| 39 | ; MS assembler doesn't support this instruction since no one would use it\r | |
| 40 | ; under normal circustances. Here opcode is used.\r | |
| 41 | ;\r | |
| 42 | DB 0xf, 0x21, 0xe0\r | |
| 43 | ret\r | |
| 44 | \r |