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49ba9447 | 1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2008, Intel Corporation\r | |
4 | ; All rights reserved. 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 | ; 32FlatTo64Flat.asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; Transition from 32 bit flat protected mode into 64 bit flat protected mode\r | |
19 | ;\r | |
20 | ;------------------------------------------------------------------------------\r | |
21 | \r | |
22 | BITS 32\r | |
23 | \r | |
24 | Transition32FlatTo64Flat:\r | |
25 | \r | |
26 | mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000)\r | |
27 | mov cr3, eax\r | |
28 | \r | |
29 | mov eax, cr4\r | |
30 | bts eax, 5 ; enable PAE\r | |
31 | mov cr4, eax \r | |
32 | \r | |
33 | mov ecx, 0xc0000080\r | |
34 | rdmsr\r | |
35 | bts eax, 8 ; set LME\r | |
36 | wrmsr\r | |
37 | \r | |
38 | mov eax, cr0\r | |
39 | bts eax, 31 ; set PG\r | |
40 | mov cr0, eax ; enable paging\r | |
41 | \r | |
42 | jmp LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)\r | |
43 | BITS 64\r | |
44 | jumpTo64BitAndLandHere:\r | |
45 | \r | |
46 | writeToSerialPort '6'\r | |
47 | writeToSerialPort '4'\r | |
48 | writeToSerialPort ' '\r | |
49 | \r | |
50 | OneTimeCallRet Transition32FlatTo64Flat\r | |
51 | \r |