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Diffstat (limited to 'ReferenceCode/Haswell/Txt/TxtInit/Dxe/TxtDxe.c')
| -rw-r--r-- | ReferenceCode/Haswell/Txt/TxtInit/Dxe/TxtDxe.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/ReferenceCode/Haswell/Txt/TxtInit/Dxe/TxtDxe.c b/ReferenceCode/Haswell/Txt/TxtInit/Dxe/TxtDxe.c new file mode 100644 index 0000000..ef7ca8b --- /dev/null +++ b/ReferenceCode/Haswell/Txt/TxtInit/Dxe/TxtDxe.c @@ -0,0 +1,171 @@ +/** @file + This is the main DXE file for TXT. It represents an abstract outline of the + steps required during DXE for enabling TXT. Each individual step is further + abstracted behind a function call interface. This is intended to minimize + the need to modify this file when porting TXT to future platforms. + +@copyright + Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved + This software and associated documentation (if any) is furnished + under a license and may only be used or copied in accordance + with the terms of the license. Except as permitted by such + license, no part of this software or documentation may be + reproduced, stored in a retrieval system, or transmitted in any + form or by any means without the express written consent of + Intel Corporation. + + This file contains an 'Intel Peripheral Driver' and uniquely + identified as "Intel Reference Module" and is + licensed for Intel CPUs and chipsets under the terms of your + license agreement with Intel or your vendor. This file may + be modified by the user, subject to additional terms of the + license agreement + +**/ + +/// +/// External include files do NOT need to be explicitly specified in real EDKII +/// environment +/// +#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000) +#include "EdkIIGlueDxe.h" +#include "Txt.h" +#include "TxtDxeLib.h" +#endif + +TXT_DXE_LIB_CONTEXT mTxtDxeCtx; + +/** + This function gets registered as a callback to run the SCHECK function + from the TXT BIOS ACM as a result of Boot Events. + + @param[in] Event - A pointer to the Event that triggered the callback. + @param[in] Context - A pointer to private data registered with the callback function. + + @retval EFI_SUCCESS - Always. + + **/ +EFI_STATUS +EFIAPI +ScheckCallback ( + IN EFI_EVENT Event, + IN VOID *Context + ) +{ + DEBUG ((EFI_D_INFO, "TXTDXE::Running of DoScheck\n")); + + DoScheck (&mTxtDxeCtx); + /// + /// Closed the event to avoid call twice when launch shell + /// + gBS->CloseEvent (Event); + + return EFI_SUCCESS; +} +/** + This is the entry point to the TXT DXE Driver. This routine checks to see if + the platform should be configured for TXT and if so, configures the platform + by reserving and initializing TXT Configuration Space and TXT Device Memory and + registering a callback to run SCHECK from the TXT BIOS ACM prior to boot. + + If the platform should not be configured for TXT, this routine checks the + establishment bit in the TPM and resets it if it is asserted. + + @param[in] ImageHandle - A handle for this module + @param[in] SystemTable - A pointer to the EFI System Table + + @retval EFI_SUCCESS - If TXT initialization succeed + @retval EFI_UNLOAD_IMAGE - If TXT criterias are not met +**/ +EFI_STATUS +EFIAPI +DriverEntry ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + EFI_STATUS Status; + EFI_EVENT ReadyToBootEvent; + /// + /// Initialize the platform specific code + /// + Status = InitializeTxtDxeLib (ImageHandle, SystemTable, &mTxtDxeCtx); + /// + /// If failure - assume TXT is not enabled + /// + if (EFI_ERROR (Status)) { + DEBUG ((EFI_D_ERROR, "TXTDXE::InitializeTxtDxeLib failed.... Unloading\n")); + return EFI_UNLOAD_IMAGE; + } + /// + /// If ESTS.TXTRESET bit is set, skip all other functions since + /// attempt to execute GETSEC will hang system. Skipping allows to + /// boot to OS and let MLE assess situation. + /// + if (IsTxtResetSet (&mTxtDxeCtx)) { + DEBUG ((EFI_D_ERROR, "TXTDXE::TXT_RESET bit is set.... Unloading\n")); + return EFI_UNLOAD_IMAGE; + } + /// + /// If TXT is enabled, configure platform appropriately. + /// Code assumes that if TXT is enabled by CPU driver than all checks + /// are passed, i.e. TPM is present, CPU and CS are TXT capable. + /// + /// + /// Add to check CPU TXT capable in case CPU drivers do not check additional requirements + /// + if ((mTxtDxeCtx.TxtInfoData->ChipsetIsTxtCapable) && IsTxtProcessor () && IsTxtEnabled (&mTxtDxeCtx)) { + DEBUG ((EFI_D_INFO, "TXTDXE::TXT Enabled\n")); + /// + /// Mark TXT Config Space as System Reserved in Memory Map + /// + ReserveTxtConfigSpace (&mTxtDxeCtx); + + /// + /// Allocate and Initialize TXT Device Memory + /// + Status = SetupTxtDeviceMemory (&mTxtDxeCtx); + if (EFI_ERROR (Status)) { + DEBUG ((EFI_D_ERROR, "TXTDXE::SetupTxtDeviceMemory failed.... Unloading\n")); + return EFI_UNLOAD_IMAGE; + } + /// + /// Create callback to run SCHECK on a Legacy Boot event + /// + Status = EfiCreateEventReadyToBootEx ( + EFI_TPL_CALLBACK, + ScheckCallback, + NULL, + &ReadyToBootEvent + ); + ASSERT_EFI_ERROR (Status); + + } else { + /// + /// TXT is not enabled, so make sure TPM Establishment + /// bit is de-asserted + /// + DEBUG ((EFI_D_INFO, "TXTDXE::TXT Disabled\n")); + + if (IsTxtEstablished (&mTxtDxeCtx)) { + /// + /// We can invoke BIOS ACM function only if CS and CPU are TXT + /// capable + /// + if ((mTxtDxeCtx.TxtInfoData->ChipsetIsTxtCapable) && + IsTxtProcessor () && + !(mTxtDxeCtx.TxtInfoData->Flags & TPM_INIT_FAILED) + ) { + DEBUG ((EFI_D_INFO, "TXTDXE::Resetting TPM Establishment bit\n")); + ResetTpmEstBit (&mTxtDxeCtx); + } + } + /// + /// Reset AUX + /// + Status = ResetTpmAux (&mTxtDxeCtx); + ASSERT_EFI_ERROR (Status); + } + + return EFI_SUCCESS; +} |