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https://github.com/tianocore/edk2
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713d8dda0b
1. Allocate ReservedMemory instead of ACPIMemoryNVS for its shadow memory space which is not required to be restored by OS. 2. Use IA32_IDT_GATE_DESCRIPTOR defined in BaseLib instead of local struct INTERRUPT_GATE_DESCRIPTOR. 3. Just reserve memory space for page table, but not create it, and allocate the memory with ReservedMemory instead of ACPIMemoryNVS. 4. ACPI4.0/5.0 have clear description: FIRMWARE_CTRL: If the X_FIRMWARE_CTRL field contains a non zero value then this field must be zero. X_FIRMWARE_CTRL: This field is used when the physical address of the FACS is above 4GB. If the FIRMWARE_CTRL field contains a non zero value then this field must be zero. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/branches/UDK2010.SR1@14231 6f19259b-4bc3-4df7-8a09-765794883524
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/** @file
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Boot Script Helper SMM driver.
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This driver is responsible to store BootScriptThunk from ReservedMemory to SMRAM for security consideration.
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Copyright (c) 2010 - 2012, 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
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of the BSD License which accompanies this distribution. The
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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 <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/PcdLib.h>
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#include <Library/DebugLib.h>
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#include <Library/LockBoxLib.h>
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#include <Guid/BootScriptThunkData.h>
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EFI_GUID mBootScriptThunkGuid = {
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0xa053f561, 0xf56b, 0x4140, {0x89, 0x1, 0xb4, 0xcb, 0x5d, 0x70, 0x92, 0x9e}
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};
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/**
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Entry point function of the Boot Script Thunk Helper SMM driver.
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The entry point is executed successfully.
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@retval other Some error occurs when executing this entry point.
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**/
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EFI_STATUS
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EFIAPI
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BootScriptThunkHelperMain (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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BOOT_SCRIPT_THUNK_DATA *BootScriptThunkData;
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EFI_STATUS Status;
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//
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// Get BootScriptThunk variable
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//
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BootScriptThunkData = (BOOT_SCRIPT_THUNK_DATA *)(UINTN)PcdGet64(BootScriptThunkDataPtr);
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ASSERT (BootScriptThunkData != NULL);
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if (BootScriptThunkData == NULL) {
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return EFI_NOT_FOUND;
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}
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//
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// Save BootScriptThunk image
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//
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Status = SaveLockBox (
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&mBootScriptThunkGuid,
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(VOID *)(UINTN)BootScriptThunkData->BootScriptThunkBase,
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(UINTN)BootScriptThunkData->BootScriptThunkLength
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);
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ASSERT_EFI_ERROR (Status);
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Status = SetLockBoxAttributes (&mBootScriptThunkGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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