diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 16:16:34 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:45 +0800 |
commit | 98978ffbf63ed054a7b69a2d9c21ce765d988018 (patch) | |
tree | 7c75a67c7fe8133625cab086f487f0f7497b4756 /Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c | |
parent | b47932475500fc4b72ceab745aefd590ad1d1e6a (diff) | |
download | edk2-platforms-98978ffbf63ed054a7b69a2d9c21ce765d988018.tar.xz |
IntelFsp2WrapperPkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c')
-rw-r--r-- | Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c b/Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c new file mode 100644 index 0000000000..061d381c1b --- /dev/null +++ b/Core/IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/X64/DispatchExecute.c @@ -0,0 +1,108 @@ +/** @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) 2014 - 2016, 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 <Uefi.h>
+#include <Library/BaseLib.h>
+#include <FspEas.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_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[in] Function The 32bit code entry to be executed.
+ @param[in] Param1 The first parameter to pass to 32bit code
+ @param[in] Param2 The second parameter to pass to 32bit code
+ @param[in] InternalGdtr The GDT and GDT descriptor used by this library
+
+ @return status.
+**/
+UINT32
+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[in] Function The 32bit code entry to be executed.
+ @param[in] Param1 The first parameter to pass to 32bit code.
+ @param[in] Param2 The second parameter to pass to 32bit code.
+
+ @return EFI_STATUS.
+**/
+EFI_STATUS
+Execute32BitCode (
+ IN UINT64 Function,
+ IN UINT64 Param1,
+ IN UINT64 Param2
+ )
+{
+ EFI_STATUS Status;
+ IA32_DESCRIPTOR Idtr;
+
+ //
+ // Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.
+ // If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here for X64 only.
+ // Interrupt is already disabled here, so it is safety to update IDTR.
+ //
+ AsmReadIdtr (&Idtr);
+ Status = AsmExecute32BitCode (Function, Param1, Param2, &mGdt);
+ AsmWriteIdtr (&Idtr);
+
+ return Status;
+}
+
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