a33a2f6221
Contributed-under: TianoCore Contribution Agreement 1.0 Signed off by: Jiewen Yao <jiewen.yao@intel.com> Reviewed by: Ravi Rangarajan <ravi.p.rangarajan@intel.com> Reviewed by: Maurice Ma <maurice.ma@intel.com> Reviewed by: Giri Mudusuru <giri.p.mudusuru@intel.com> Reviewed by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15676 6f19259b-4bc3-4df7-8a09-765794883524
95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/** @file
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Execute 32-bit code in Long Mode.
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Provide a thunk function to transition from long mode to compatibility mode to execute 32-bit code and then transit
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back to long mode.
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Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/BaseLib.h>
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#include <FspApi.h>
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#pragma pack(1)
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typedef union {
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struct {
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UINT32 LimitLow : 16;
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UINT32 BaseLow : 16;
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UINT32 BaseMid : 8;
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UINT32 Type : 4;
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UINT32 System : 1;
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UINT32 Dpl : 2;
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UINT32 Present : 1;
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UINT32 LimitHigh : 4;
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UINT32 Software : 1;
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UINT32 Reserved : 1;
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UINT32 DefaultSize : 1;
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UINT32 Granularity : 1;
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UINT32 BaseHigh : 8;
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} Bits;
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UINT64 Uint64;
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} IA32_GDT;
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#pragma pack()
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GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT mGdtEntries[] = {
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{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, /* 0x0: reserve */
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{{0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 0, 1, 1, 0}}, /* 0x8: compatibility mode */
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{{0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 1, 0, 1, 0}}, /* 0x10: for long mode */
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{{0xFFFF, 0, 0, 0x3, 1, 0, 1, 0xF, 0, 0, 1, 1, 0}}, /* 0x18: data */
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{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, /* 0x20: reserve */
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};
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//
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// IA32 Gdt register
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//
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GLOBAL_REMOVE_IF_UNREFERENCED IA32_DESCRIPTOR mGdt = {
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sizeof (mGdtEntries) - 1,
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(UINTN) mGdtEntries
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};
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/**
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Assembly function to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
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long mode.
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@param[in] Function The 32bit code entry to be executed.
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@param[in] Param1 The first parameter to pass to 32bit code
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@param[in] Param2 The second parameter to pass to 32bit code
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@param[in] InternalGdtr The GDT and GDT descriptor used by this library
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@return status.
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**/
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UINT32
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AsmExecute32BitCode (
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IN UINT64 Function,
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IN UINT64 Param1,
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IN UINT64 Param2,
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IN IA32_DESCRIPTOR *InternalGdtr
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);
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/**
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Wrapper for a thunk to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
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long mode.
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@param[in] Function The 32bit code entry to be executed.
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@param[in] Param1 The first parameter to pass to 32bit code.
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@return FSP_STATUS.
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**/
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FSP_STATUS
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Execute32BitCode (
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IN UINT64 Function,
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IN UINT64 Param1
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)
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{
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return AsmExecute32BitCode (Function, Param1, 0, &mGdt);
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}
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