mirror of https://github.com/acidanthera/audk.git
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/** @file
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IA-32/x64 AsmDisablePaging64()
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "BaseLibInternals.h"
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/**
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Disables the 64-bit paging mode on the CPU.
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Disables the 64-bit paging mode on the CPU and returns to 32-bit protected
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mode. This function assumes the current execution mode is 64-paging mode.
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This function is only available on x64. After the 64-bit paging mode is
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disabled, control is transferred to the function specified by EntryPoint
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using the new stack specified by NewStack and passing in the parameters
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specified by Context1 and Context2. Context1 and Context2 are optional and
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may be 0. The function EntryPoint must never return.
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If the current execution mode is not 64-bit paged mode, then ASSERT().
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If EntryPoint is 0, then ASSERT().
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If NewStack is 0, then ASSERT().
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@param Cs The 16-bit selector to load in the CS before EntryPoint
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is called. The descriptor in the GDT that this selector
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references must be setup for 32-bit protected mode.
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@param EntryPoint The 64-bit virtual address of the function to call with
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the new stack after paging is disabled.
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@param Context1 The 64-bit virtual address of the context to pass into
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the EntryPoint function as the first parameter after
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paging is disabled.
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@param Context2 The 64-bit virtual address of the context to pass into
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the EntryPoint function as the second parameter after
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paging is disabled.
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@param NewStack The 64-bit virtual address of the new stack to use for
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the EntryPoint function after paging is disabled.
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**/
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VOID
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EFIAPI
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AsmDisablePaging64 (
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IN UINT16 Cs,
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IN UINT32 EntryPoint,
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IN UINT32 Context1, OPTIONAL
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IN UINT32 Context2, OPTIONAL
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IN UINT32 NewStack
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)
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{
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ASSERT (EntryPoint != 0);
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ASSERT (NewStack != 0);
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InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
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}
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