diff options
Diffstat (limited to 'EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/X64/DispatchExecute.c')
-rw-r--r-- | EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/X64/DispatchExecute.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/X64/DispatchExecute.c b/EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/X64/DispatchExecute.c new file mode 100644 index 0000000000..8ef4299901 --- /dev/null +++ b/EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/X64/DispatchExecute.c @@ -0,0 +1,106 @@ +/** @file
+ Execute 32-bit code in Long Mode
+ Provide a thunk function to transition from long mode to compatibility mode to execute 32-bit code and then transit
+ back to long mode.
+
+ Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#include "ScriptSave.h"
+
+#pragma pack(1)
+typedef union {
+ struct {
+ UINT32 LimitLow : 16;
+ UINT32 BaseLow : 16;
+ UINT32 BaseMid : 8;
+ UINT32 Type : 4;
+ UINT32 System : 1;
+ UINT32 Dpl : 2;
+ UINT32 Present : 1;
+ UINT32 LimitHigh : 4;
+ UINT32 Software : 1;
+ UINT32 Reserved : 1;
+ UINT32 DefaultSize : 1;
+ UINT32 Granularity : 1;
+ UINT32 BaseHigh : 8;
+ } Bits;
+ UINT64 Uint64;
+} IA32_GDT;
+#pragma pack()
+
+//
+// Global Descriptor Table (GDT)
+//
+GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT mGdtEntries[] = {
+ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, /* 0x0: reserve */
+ {{0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 0, 1, 1, 0}}, /* 0x8: compatibility mode */
+ {{0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 1, 0, 1, 0}}, /* 0x10: for long mode */
+ {{0xFFFF, 0, 0, 0x3, 1, 0, 1, 0xF, 0, 0, 1, 1, 0}}, /* 0x18: data */
+ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, /* 0x20: reserve */
+};
+
+//
+// IA32 Gdt register
+//
+GLOBAL_REMOVE_IF_UNREFERENCED IA32_DESCRIPTOR mGdt = {
+ sizeof (mGdtEntries) - 1,
+ (UINTN) mGdtEntries
+ };
+/**
+ Assembly function to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
+ long mode.
+ @param Function The 32bit code entry to be executed.
+ @param Param1 The first parameter to pass to 32bit code
+ @param Param2 The second parameter to pass to 32bit code
+ @param InternalGdtr The GDT and GDT descriptor used by this library
+
+ @retval EFI_SUCCESS Execute 32bit code successfully.
+ @retval other Something wrong when execute the 32bit code
+**/
+EFI_STATUS
+AsmExecute32BitCode (
+ IN UINT64 Function,
+ IN UINT64 Param1,
+ IN UINT64 Param2,
+ IN IA32_DESCRIPTOR *InternalGdtr
+ );
+
+/**
+ Wrapper for a thunk to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
+ long mode.
+
+ @param Function The 32bit code entry to be executed.
+ @param Param1 The first parameter to pass to 32bit code
+ @param Param2 The second parameter to pass to 32bit code
+ @retval EFI_SUCCESS Execute 32bit code successfully.
+ @retval other Something wrong when execute the 32bit code
+
+**/
+EFI_STATUS
+Execute32BitCode (
+ IN UINT64 Function,
+ IN UINT64 Param1,
+ IN UINT64 Param2
+ )
+{
+ EFI_STATUS Status;
+
+ ASSERT (Function != 0);
+
+ Status = AsmExecute32BitCode (
+ Function,
+ Param1,
+ Param2,
+ &mGdt
+ );
+ return Status;
+}
+
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