projects / mirror_edk2.git / blame
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|---|---|---|
| 2c7e5c2f HT |
1 | ; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>\r |
| 2 | ; This program and the accompanying materials \r | |
| 3eb9473e | 3 | ; are licensed and made available under the terms and conditions of the BSD License \r |
| 4 | ; which accompanies this distribution. The full text of the license may be found at \r | |
| 5 | ; http://opensource.org/licenses/bsd-license.php \r | |
| 6 | ; \r | |
| 7 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 8 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 9 | ;\r | |
| 10 | ; Module Name:\r | |
| 11 | ;\r | |
| 12 | ; DisablePaging64.Asm\r | |
| 13 | ;\r | |
| 14 | ; Abstract:\r | |
| 15 | ;\r | |
| 16 | ; AsmDisablePaging64 function\r | |
| 17 | ;\r | |
| 18 | ; Notes:\r | |
| 19 | ;\r | |
| 20 | ;------------------------------------------------------------------------------\r | |
| 21 | \r | |
| 22 | .code\r | |
| 23 | \r | |
| 24 | ;------------------------------------------------------------------------------\r | |
| 25 | ; VOID\r | |
| 26 | ; EFIAPI\r | |
| 27 | ; InternalX86DisablePaging64 (\r | |
| 28 | ; IN UINT16 Cs,\r | |
| 29 | ; IN UINT32 EntryPoint,\r | |
| 30 | ; IN UINT32 Context1, OPTIONAL\r | |
| 31 | ; IN UINT32 Context2, OPTIONAL\r | |
| 32 | ; IN UINT32 NewStack\r | |
| 33 | ; );\r | |
| 34 | ;------------------------------------------------------------------------------\r | |
| 35 | InternalX86DisablePaging64 PROC\r | |
| 36 | cli\r | |
| 37 | shl rcx, 32 ; rcx[32..47] <- Cs\r | |
| 38 | lea eax, @F\r | |
| 39 | mov esi, r8d\r | |
| 40 | or rcx, rax ; rcx[0..47] <- Cs:@F\r | |
| 41 | mov edi, r9d\r | |
| 42 | mov eax, [rsp + 28h] ; eax <- New Stack\r | |
| 43 | push rcx\r | |
| 44 | retf ; switch to compatibility mode\r | |
| 45 | @@:\r | |
| 46 | mov esp, eax ; set up new stack\r | |
| 47 | mov rax, cr0\r | |
| 48 | btr eax, 31\r | |
| 49 | mov cr0, rax ; disable paging\r | |
| 50 | mov ecx, 0c0000080h\r | |
| 51 | rdmsr\r | |
| 52 | and ah, NOT 1 ; clear LME\r | |
| 53 | wrmsr\r | |
| 54 | mov rax, cr4\r | |
| 55 | and al, NOT (1 SHL 5) ; clear PAE\r | |
| 56 | mov cr4, rax\r | |
| 57 | push rdi ; push Context2\r | |
| 58 | push rsi ; push Context1\r | |
| 59 | call rdx ; transfer control to EntryPoint\r | |
| 60 | hlt ; no one should get here\r | |
| 61 | InternalX86DisablePaging64 ENDP\r | |
| 62 | \r | |
| 63 | END\r |