mirror of https://github.com/acidanthera/audk.git
543 lines
16 KiB
C
543 lines
16 KiB
C
/** @file
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Copyright (c) 2010, 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 <PiSmm.h>
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#include <Library/SmmServicesTableLib.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/LockBoxLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/SmmLockBox.h>
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#include "SmmLockBoxLibPrivate.h"
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/**
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We need handle this library carefully. Only one library instance will construct the environment.
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Below 2 global variable can only be used in constructor. They should NOT be used in any other library functions.
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**/
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SMM_LOCK_BOX_CONTEXT mSmmLockBoxContext;
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LIST_ENTRY mLockBoxQueue = INITIALIZE_LIST_HEAD_VARIABLE (mLockBoxQueue);
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/**
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This function return SmmLockBox context from SMST.
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@return SmmLockBox context from SMST.
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**/
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SMM_LOCK_BOX_CONTEXT *
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InternalGetSmmLockBoxContext (
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VOID
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)
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{
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UINTN Index;
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//
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// Check if gEfiSmmLockBoxCommunicationGuid is installed by someone
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//
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for (Index = 0; Index < gSmst->NumberOfTableEntries; Index++) {
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if (CompareGuid (&gSmst->SmmConfigurationTable[Index].VendorGuid, &gEfiSmmLockBoxCommunicationGuid)) {
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//
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// Found. That means some other library instance is already run.
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// No need to install again, just return.
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//
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return (SMM_LOCK_BOX_CONTEXT *)gSmst->SmmConfigurationTable[Index].VendorTable;
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}
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}
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//
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// Not found.
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//
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return NULL;
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}
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/**
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Constructor for SmmLockBox library.
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This is used to set SmmLockBox context, which will be used in PEI phase in S3 boot path later.
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@param[in] ImageHandle Image handle of this driver.
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@param[in] SystemTable A Pointer to the EFI System Table.
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@retval EFI_SUCEESS
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@return Others Some error occurs.
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**/
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EFI_STATUS
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EFIAPI
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SmmLockBoxSmmConstructuor (
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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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EFI_STATUS Status;
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SMM_LOCK_BOX_CONTEXT *SmmLockBoxContext;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Enter\n"));
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//
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// Check if gEfiSmmLockBoxCommunicationGuid is installed by someone
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//
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SmmLockBoxContext = InternalGetSmmLockBoxContext ();
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if (SmmLockBoxContext != NULL) {
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//
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// Find it. That means some other library instance is already run.
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// No need to install again, just return.
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxContext - already installed\n"));
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Exit\n"));
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return EFI_SUCCESS;
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}
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//
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// If no one install this, it means this is first instance. Install it.
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//
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if (sizeof(UINTN) == sizeof(UINT64)) {
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mSmmLockBoxContext.Signature = SMM_LOCK_BOX_SIGNATURE_64;
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} else {
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mSmmLockBoxContext.Signature = SMM_LOCK_BOX_SIGNATURE_32;
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}
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mSmmLockBoxContext.LockBoxDataAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)&mLockBoxQueue;
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Status = gSmst->SmmInstallConfigurationTable (
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gSmst,
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&gEfiSmmLockBoxCommunicationGuid,
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&mSmmLockBoxContext,
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sizeof(mSmmLockBoxContext)
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);
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ASSERT_EFI_ERROR (Status);
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxContext - %x\n", (UINTN)&mSmmLockBoxContext));
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib LockBoxDataAddress - %x\n", (UINTN)&mLockBoxQueue));
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Exit\n"));
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return Status;
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}
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/**
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This function return SmmLockBox queue address.
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@return SmmLockBox queue address.
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**/
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LIST_ENTRY *
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InternalGetLockBoxQueue (
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VOID
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)
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{
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SMM_LOCK_BOX_CONTEXT *SmmLockBoxContext;
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SmmLockBoxContext = InternalGetSmmLockBoxContext ();
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ASSERT (SmmLockBoxContext != NULL);
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if (SmmLockBoxContext == NULL) {
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return NULL;
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}
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return (LIST_ENTRY *)(UINTN)SmmLockBoxContext->LockBoxDataAddress;
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}
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/**
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This function find LockBox by GUID.
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@param Guid The guid to indentify the LockBox
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@return LockBoxData
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**/
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SMM_LOCK_BOX_DATA *
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InternalFindLockBoxByGuid (
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IN EFI_GUID *Guid
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)
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{
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LIST_ENTRY *Link;
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SMM_LOCK_BOX_DATA *LockBox;
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LIST_ENTRY *LockBoxQueue;
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LockBoxQueue = InternalGetLockBoxQueue ();
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ASSERT (LockBoxQueue != NULL);
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for (Link = LockBoxQueue->ForwardLink;
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Link != LockBoxQueue;
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Link = Link->ForwardLink) {
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LockBox = BASE_CR (
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Link,
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SMM_LOCK_BOX_DATA,
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Link
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);
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if (CompareGuid (&LockBox->Guid, Guid)) {
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return LockBox;
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}
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}
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return NULL;
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}
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/**
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This function will save confidential information to lockbox.
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@param Guid the guid to identify the confidential information
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@param Buffer the address of the confidential information
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@param Length the length of the confidential information
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@retval RETURN_SUCCESS the information is saved successfully.
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@retval RETURN_INVALID_PARAMETER the Guid is NULL, or Buffer is NULL, or Length is 0
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@retval RETURN_ALREADY_STARTED the requested GUID already exist.
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@retval RETURN_OUT_OF_RESOURCES no enough resource to save the information.
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@retval RETURN_ACCESS_DENIED it is too late to invoke this interface
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@retval RETURN_NOT_STARTED it is too early to invoke this interface
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@retval RETURN_UNSUPPORTED the service is not supported by implementaion.
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**/
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RETURN_STATUS
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EFIAPI
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SaveLockBox (
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IN GUID *Guid,
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IN VOID *Buffer,
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IN UINTN Length
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)
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{
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SMM_LOCK_BOX_DATA *LockBox;
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EFI_PHYSICAL_ADDRESS SmramBuffer;
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EFI_STATUS Status;
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LIST_ENTRY *LockBoxQueue;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Enter\n"));
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//
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// Basic check
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//
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if ((Guid == NULL) || (Buffer == NULL) || (Length == 0)) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));
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return EFI_INVALID_PARAMETER;
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}
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//
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// Find LockBox
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//
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LockBox = InternalFindLockBoxByGuid (Guid);
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if (LockBox != NULL) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_ALREADY_STARTED));
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return EFI_ALREADY_STARTED;
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}
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//
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// Allocate SMRAM buffer
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//
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Status = gSmst->SmmAllocatePages (
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AllocateAnyPages,
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EfiRuntimeServicesData,
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EFI_SIZE_TO_PAGES (Length),
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&SmramBuffer
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);
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ASSERT_EFI_ERROR (Status);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_OUT_OF_RESOURCES));
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return EFI_OUT_OF_RESOURCES;
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}
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//
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// Allocate LockBox
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//
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Status = gSmst->SmmAllocatePool (
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EfiRuntimeServicesData,
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sizeof(*LockBox),
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(VOID **)&LockBox
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);
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ASSERT_EFI_ERROR (Status);
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if (EFI_ERROR (Status)) {
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gSmst->SmmFreePages (SmramBuffer, EFI_SIZE_TO_PAGES (Length));
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_OUT_OF_RESOURCES));
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return EFI_OUT_OF_RESOURCES;
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}
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//
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// Save data
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//
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CopyMem ((VOID *)(UINTN)SmramBuffer, (VOID *)(UINTN)Buffer, Length);
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//
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// Insert LockBox to queue
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//
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LockBox->Signature = SMM_LOCK_BOX_DATA_SIGNATURE;
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CopyMem (&LockBox->Guid, Guid, sizeof(EFI_GUID));
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LockBox->Buffer = (EFI_PHYSICAL_ADDRESS)(UINTN)Buffer;
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LockBox->Length = (UINT64)Length;
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LockBox->SmramBuffer = SmramBuffer;
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LockBoxQueue = InternalGetLockBoxQueue ();
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ASSERT (LockBoxQueue != NULL);
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InsertTailList (LockBoxQueue, &LockBox->Link);
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//
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// Done
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_SUCCESS));
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return EFI_SUCCESS;
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}
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/**
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This function will set lockbox attributes.
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@param Guid the guid to identify the confidential information
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@param Attributes the attributes of the lockbox
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@retval RETURN_SUCCESS the information is saved successfully.
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@retval RETURN_INVALID_PARAMETER attributes is invalid.
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@retval RETURN_NOT_FOUND the requested GUID not found.
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@retval RETURN_ACCESS_DENIED it is too late to invoke this interface
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@retval RETURN_NOT_STARTED it is too early to invoke this interface
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@retval RETURN_UNSUPPORTED the service is not supported by implementaion.
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**/
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RETURN_STATUS
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EFIAPI
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SetLockBoxAttributes (
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IN GUID *Guid,
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IN UINT64 Attributes
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)
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{
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SMM_LOCK_BOX_DATA *LockBox;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Enter\n"));
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//
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// Basic check
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//
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if ((Guid == NULL) ||
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((Attributes & ~LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) != 0)) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_INVALID_PARAMETER));
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return EFI_INVALID_PARAMETER;
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}
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//
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// Find LockBox
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//
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LockBox = InternalFindLockBoxByGuid (Guid);
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if (LockBox == NULL) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_NOT_FOUND));
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return EFI_NOT_FOUND;
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}
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//
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// Update data
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//
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LockBox->Attributes = Attributes;
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//
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// Done
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_SUCCESS));
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return EFI_SUCCESS;
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}
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/**
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This function will update confidential information to lockbox.
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@param Guid the guid to identify the original confidential information
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@param Offset the offset of the original confidential information
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@param Buffer the address of the updated confidential information
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@param Length the length of the updated confidential information
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@retval RETURN_SUCCESS the information is saved successfully.
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@retval RETURN_INVALID_PARAMETER the Guid is NULL, or Buffer is NULL, or Length is 0.
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@retval RETURN_NOT_FOUND the requested GUID not found.
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@retval RETURN_BUFFER_TOO_SMALL the original buffer to too small to hold new information.
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@retval RETURN_ACCESS_DENIED it is too late to invoke this interface
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@retval RETURN_NOT_STARTED it is too early to invoke this interface
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@retval RETURN_UNSUPPORTED the service is not supported by implementaion.
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**/
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RETURN_STATUS
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EFIAPI
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UpdateLockBox (
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IN GUID *Guid,
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IN UINTN Offset,
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IN VOID *Buffer,
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IN UINTN Length
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)
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{
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SMM_LOCK_BOX_DATA *LockBox;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Enter\n"));
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//
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// Basic check
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//
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if ((Guid == NULL) || (Buffer == NULL) || (Length == 0)) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));
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return EFI_INVALID_PARAMETER;
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}
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//
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// Find LockBox
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//
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LockBox = InternalFindLockBoxByGuid (Guid);
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if (LockBox == NULL) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_NOT_FOUND));
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return EFI_NOT_FOUND;
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}
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//
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// Update data
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//
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if (LockBox->Length < Offset + Length) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_BUFFER_TOO_SMALL));
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return EFI_BUFFER_TOO_SMALL;
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}
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CopyMem ((VOID *)((UINTN)LockBox->SmramBuffer + Offset), Buffer, Length);
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//
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// Done
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_SUCCESS));
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return EFI_SUCCESS;
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}
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/**
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This function will restore confidential information from lockbox.
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@param Guid the guid to identify the confidential information
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@param Buffer the address of the restored confidential information
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NULL means restored to original address, Length MUST be NULL at same time.
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@param Length the length of the restored confidential information
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@retval RETURN_SUCCESS the information is restored successfully.
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@retval RETURN_INVALID_PARAMETER the Guid is NULL, or one of Buffer and Length is NULL.
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@retval RETURN_WRITE_PROTECTED Buffer and Length are NULL, but the LockBox has no
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LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE attribute.
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@retval RETURN_BUFFER_TOO_SMALL the Length is too small to hold the confidential information.
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@retval RETURN_NOT_FOUND the requested GUID not found.
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@retval RETURN_NOT_STARTED it is too early to invoke this interface
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@retval RETURN_ACCESS_DENIED not allow to restore to the address
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@retval RETURN_UNSUPPORTED the service is not supported by implementaion.
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**/
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RETURN_STATUS
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EFIAPI
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RestoreLockBox (
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IN GUID *Guid,
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IN VOID *Buffer, OPTIONAL
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IN OUT UINTN *Length OPTIONAL
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)
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{
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SMM_LOCK_BOX_DATA *LockBox;
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VOID *RestoreBuffer;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Enter\n"));
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//
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// Restore this, Buffer and Length MUST be both NULL or both non-NULL
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//
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if ((Guid == NULL) ||
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((Buffer == NULL) && (Length != NULL)) ||
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((Buffer != NULL) && (Length == NULL))) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));
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return EFI_INVALID_PARAMETER;
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}
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//
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// Find LockBox
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//
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LockBox = InternalFindLockBoxByGuid (Guid);
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if (LockBox == NULL) {
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//
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// Not found
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_NOT_FOUND));
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return EFI_NOT_FOUND;
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}
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//
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// Set RestoreBuffer
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//
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if (Buffer != NULL) {
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//
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// restore to new buffer
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//
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RestoreBuffer = Buffer;
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} else {
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//
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// restore to original buffer
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//
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if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) == 0) {
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_WRITE_PROTECTED));
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return EFI_WRITE_PROTECTED;
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}
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RestoreBuffer = (VOID *)(UINTN)LockBox->Buffer;
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}
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//
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// Set RestoreLength
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//
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if (Length != NULL) {
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if (*Length < (UINTN)LockBox->Length) {
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//
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// Input buffer is too small to hold all data.
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//
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*Length = (UINTN)LockBox->Length;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_BUFFER_TOO_SMALL));
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return EFI_BUFFER_TOO_SMALL;
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}
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*Length = (UINTN)LockBox->Length;
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}
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//
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// Restore data
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//
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CopyMem (RestoreBuffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);
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//
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// Done
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//
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_SUCCESS));
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return EFI_SUCCESS;
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}
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/**
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This function will restore confidential information from all lockbox which have RestoreInPlace attribute.
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@retval RETURN_SUCCESS the information is restored successfully.
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@retval RETURN_NOT_STARTED it is too early to invoke this interface
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@retval RETURN_UNSUPPORTED the service is not supported by implementaion.
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**/
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RETURN_STATUS
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EFIAPI
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RestoreAllLockBoxInPlace (
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VOID
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)
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{
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SMM_LOCK_BOX_DATA *LockBox;
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LIST_ENTRY *Link;
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LIST_ENTRY *LockBoxQueue;
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DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreAllLockBoxInPlace - Enter\n"));
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LockBoxQueue = InternalGetLockBoxQueue ();
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ASSERT (LockBoxQueue != NULL);
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//
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// Restore all, Buffer and Length MUST be NULL
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//
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for (Link = LockBoxQueue->ForwardLink;
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Link != LockBoxQueue;
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Link = Link->ForwardLink) {
|
|
LockBox = BASE_CR (
|
|
Link,
|
|
SMM_LOCK_BOX_DATA,
|
|
Link
|
|
);
|
|
if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) != 0) {
|
|
//
|
|
// Restore data
|
|
//
|
|
CopyMem ((VOID *)(UINTN)LockBox->Buffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);
|
|
}
|
|
}
|
|
//
|
|
// Done
|
|
//
|
|
DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreAllLockBoxInPlace - Exit (%r)\n", EFI_SUCCESS));
|
|
return EFI_SUCCESS;
|
|
}
|
|
|