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1 | ;------------------------------------------------------------------------------\r |
2 | ; @file\r | |
3 | ; Transition from 32 bit flat protected mode into 64 bit flat protected mode\r | |
4 | ;\r | |
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5 | ; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>\r |
6 | ; This program and the accompanying materials\r | |
bc252e8e EB |
7 | ; are licensed and made available under the terms and conditions of the BSD License\r |
8 | ; which accompanies this distribution. The full text of the license may be found at\r | |
9 | ; http://opensource.org/licenses/bsd-license.php\r | |
10 | ;\r | |
11 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | ;\r | |
14 | ;------------------------------------------------------------------------------\r | |
15 | \r | |
16 | BITS 32\r | |
17 | \r | |
18 | ;\r | |
19 | ; Modified: EAX\r | |
20 | ;\r | |
21 | Transition32FlatTo64Flat:\r | |
22 | \r | |
23 | mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000)\r | |
24 | mov cr3, eax\r | |
25 | \r | |
26 | mov eax, cr4\r | |
27 | bts eax, 5 ; enable PAE\r | |
28 | mov cr4, eax \r | |
29 | \r | |
30 | mov ecx, 0xc0000080\r | |
31 | rdmsr\r | |
32 | bts eax, 8 ; set LME\r | |
33 | wrmsr\r | |
34 | \r | |
35 | mov eax, cr0\r | |
36 | bts eax, 31 ; set PG\r | |
37 | mov cr0, eax ; enable paging\r | |
38 | \r | |
39 | jmp LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)\r | |
40 | BITS 64\r | |
41 | jumpTo64BitAndLandHere:\r | |
42 | \r | |
43 | debugShowPostCode POSTCODE_64BIT_MODE\r | |
44 | \r | |
45 | OneTimeCallRet Transition32FlatTo64Flat\r | |
46 | \r |