| 1 | /** @file
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| 2 | IA-32/x64 AsmEnablePaging64()
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| 3 |
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| 4 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 6 |
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| 7 | **/
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| 8 |
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| 9 | #include "BaseLibInternals.h"
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| 10 |
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| 11 | /**
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| 12 | Enables the 64-bit paging mode on the CPU.
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| 13 |
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| 14 | Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables
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| 15 | must be properly initialized prior to calling this service. This function
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| 16 | assumes the current execution mode is 32-bit protected mode with flat
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| 17 | descriptors. This function is only available on IA-32. After the 64-bit
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| 18 | paging mode is enabled, control is transferred to the function specified by
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| 19 | EntryPoint using the new stack specified by NewStack and passing in the
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| 20 | parameters specified by Context1 and Context2. Context1 and Context2 are
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| 21 | optional and may be 0. The function EntryPoint must never return.
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| 22 |
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| 23 | If the current execution mode is not 32-bit protected mode with flat
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| 24 | descriptors, then ASSERT().
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| 25 | If EntryPoint is 0, then ASSERT().
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| 26 | If NewStack is 0, then ASSERT().
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| 27 |
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| 28 | @param Cs The 16-bit selector to load in the CS before EntryPoint
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| 29 | is called. The descriptor in the GDT that this selector
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| 30 | references must be setup for long mode.
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| 31 | @param EntryPoint The 64-bit virtual address of the function to call with
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| 32 | the new stack after paging is enabled.
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| 33 | @param Context1 The 64-bit virtual address of the context to pass into
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| 34 | the EntryPoint function as the first parameter after
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| 35 | paging is enabled.
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| 36 | @param Context2 The 64-bit virtual address of the context to pass into
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| 37 | the EntryPoint function as the second parameter after
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| 38 | paging is enabled.
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| 39 | @param NewStack The 64-bit virtual address of the new stack to use for
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| 40 | the EntryPoint function after paging is enabled.
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| 41 |
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| 42 | **/
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| 43 | VOID
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| 44 | EFIAPI
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| 45 | AsmEnablePaging64 (
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| 46 | IN UINT16 Cs,
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| 47 | IN UINT64 EntryPoint,
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| 48 | IN UINT64 Context1 OPTIONAL,
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| 49 | IN UINT64 Context2 OPTIONAL,
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| 50 | IN UINT64 NewStack
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| 51 | )
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| 52 | {
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| 53 | ASSERT (EntryPoint != 0);
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| 54 | ASSERT (NewStack != 0);
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| 55 | InternalX86EnablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
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| 56 | }
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