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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 | |
1efcc4ae | 9 | \r |
f734a10a | 10 | \r |
e1f414b6 | 11 | \r |
12 | #include "BaseLibInternals.h"\r | |
13 | \r | |
14 | /**\r | |
15 | Disables the 64-bit paging mode on the CPU.\r | |
16 | \r | |
17 | Disables the 64-bit paging mode on the CPU and returns to 32-bit protected\r | |
18 | mode. This function assumes the current execution mode is 64-paging mode.\r | |
030cd1a2 | 19 | This function is only available on x64. After the 64-bit paging mode is\r |
e1f414b6 | 20 | disabled, control is transferred to the function specified by EntryPoint\r |
21 | using the new stack specified by NewStack and passing in the parameters\r | |
22 | specified by Context1 and Context2. Context1 and Context2 are optional and\r | |
23 | may be 0. The function EntryPoint must never return.\r | |
24 | \r | |
25 | If the current execution mode is not 64-bit paged mode, then ASSERT().\r | |
26 | If EntryPoint is 0, then ASSERT().\r | |
27 | If NewStack is 0, then ASSERT().\r | |
28 | \r | |
29 | @param Cs The 16-bit selector to load in the CS before EntryPoint\r | |
30 | is called. The descriptor in the GDT that this selector\r | |
31 | references must be setup for 32-bit protected mode.\r | |
32 | @param EntryPoint The 64-bit virtual address of the function to call with\r | |
33 | the new stack after paging is disabled.\r | |
34 | @param Context1 The 64-bit virtual address of the context to pass into\r | |
35 | the EntryPoint function as the first parameter after\r | |
36 | paging is disabled.\r | |
37 | @param Context2 The 64-bit virtual address of the context to pass into\r | |
38 | the EntryPoint function as the second parameter after\r | |
39 | paging is disabled.\r | |
40 | @param NewStack The 64-bit virtual address of the new stack to use for\r | |
41 | the EntryPoint function after paging is disabled.\r | |
42 | \r | |
43 | **/\r | |
44 | VOID\r | |
45 | EFIAPI\r | |
46 | AsmDisablePaging64 (\r | |
47 | IN UINT16 Cs,\r | |
48 | IN UINT32 EntryPoint,\r | |
d0e2f823 MK |
49 | IN UINT32 Context1 OPTIONAL,\r |
50 | IN UINT32 Context2 OPTIONAL,\r | |
e1f414b6 | 51 | IN UINT32 NewStack\r |
52 | )\r | |
53 | {\r | |
54 | ASSERT (EntryPoint != 0);\r | |
55 | ASSERT (NewStack != 0);\r | |
56 | InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);\r | |
57 | }\r |