projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| e1f414b6 | 1 | /** @file\r |
| 2 | IA-32/x64 AsmDisablePaging64()\r | |
| 3 | \r | |
| bb817c56 | 4 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r |
| 9344f092 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| e1f414b6 | 6 | \r |
| e1f414b6 | 7 | **/\r |
| 8 | \r | |
| e1f414b6 | 9 | #include "BaseLibInternals.h"\r |
| 10 | \r | |
| 11 | /**\r | |
| 12 | Disables the 64-bit paging mode on the CPU.\r | |
| 13 | \r | |
| 14 | Disables the 64-bit paging mode on the CPU and returns to 32-bit protected\r | |
| 15 | mode. This function assumes the current execution mode is 64-paging mode.\r | |
| 030cd1a2 | 16 | This function is only available on x64. After the 64-bit paging mode is\r |
| e1f414b6 | 17 | disabled, control is transferred to the function specified by EntryPoint\r |
| 18 | using the new stack specified by NewStack and passing in the parameters\r | |
| 19 | specified by Context1 and Context2. Context1 and Context2 are optional and\r | |
| 20 | may be 0. The function EntryPoint must never return.\r | |
| 21 | \r | |
| 22 | If the current execution mode is not 64-bit paged mode, then ASSERT().\r | |
| 23 | If EntryPoint is 0, then ASSERT().\r | |
| 24 | If NewStack is 0, then ASSERT().\r | |
| 25 | \r | |
| 26 | @param Cs The 16-bit selector to load in the CS before EntryPoint\r | |
| 27 | is called. The descriptor in the GDT that this selector\r | |
| 28 | references must be setup for 32-bit protected mode.\r | |
| 29 | @param EntryPoint The 64-bit virtual address of the function to call with\r | |
| 30 | the new stack after paging is disabled.\r | |
| 31 | @param Context1 The 64-bit virtual address of the context to pass into\r | |
| 32 | the EntryPoint function as the first parameter after\r | |
| 33 | paging is disabled.\r | |
| 34 | @param Context2 The 64-bit virtual address of the context to pass into\r | |
| 35 | the EntryPoint function as the second parameter after\r | |
| 36 | paging is disabled.\r | |
| 37 | @param NewStack The 64-bit virtual address of the new stack to use for\r | |
| 38 | the EntryPoint function after paging is disabled.\r | |
| 39 | \r | |
| 40 | **/\r | |
| 41 | VOID\r | |
| 42 | EFIAPI\r | |
| 43 | AsmDisablePaging64 (\r | |
| 2f88bd3a MK |
44 | IN UINT16 Cs,\r |
| 45 | IN UINT32 EntryPoint,\r | |
| 46 | IN UINT32 Context1 OPTIONAL,\r | |
| 47 | IN UINT32 Context2 OPTIONAL,\r | |
| 48 | IN UINT32 NewStack\r | |
| e1f414b6 | 49 | )\r |
| 50 | {\r | |
| 51 | ASSERT (EntryPoint != 0);\r | |
| 52 | ASSERT (NewStack != 0);\r | |
| 53 | InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);\r | |
| 54 | }\r |