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/** @file
UEFI Miscellaneous boot Services InstallConfigurationTable service
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "DxeMain.h"
#define CONFIG_TABLE_SIZE_INCREASED 0x10
UINTN mSystemTableAllocateSize = 0;
/**
Boot Service called to add, modify, or remove a system configuration table from
the EFI System Table.
@param Guid Pointer to the GUID for the entry to add, update, or
remove
@param Table Pointer to the configuration table for the entry to add,
update, or remove, may be NULL.
@return EFI_SUCCESS Guid, Table pair added, updated, or removed.
@return EFI_INVALID_PARAMETER Input GUID is NULL.
@return EFI_NOT_FOUND Attempted to delete non-existant entry
@return EFI_OUT_OF_RESOURCES Not enough memory available
**/
EFI_STATUS
EFIAPI
CoreInstallConfigurationTable (
IN EFI_GUID *Guid,
IN VOID *Table
)
{
UINTN Index;
EFI_CONFIGURATION_TABLE *EfiConfigurationTable;
EFI_CONFIGURATION_TABLE *OldTable;
//
// If Guid is NULL, then this operation cannot be performed
//
if (Guid == NULL) {
return EFI_INVALID_PARAMETER;
}
EfiConfigurationTable = gDxeCoreST->ConfigurationTable;
//
// Search all the table for an entry that matches Guid
//
for (Index = 0; Index < gDxeCoreST->NumberOfTableEntries; Index++) {
if (CompareGuid (Guid, &(gDxeCoreST->ConfigurationTable[Index].VendorGuid))) {
break;
}
}
if (Index < gDxeCoreST->NumberOfTableEntries) {
//
// A match was found, so this is either a modify or a delete operation
//
if (Table != NULL) {
//
// If Table is not NULL, then this is a modify operation.
// Modify the table entry and return.
//
gDxeCoreST->ConfigurationTable[Index].VendorTable = Table;
//
// Signal Configuration Table change
//
CoreNotifySignalList (Guid);
return EFI_SUCCESS;
}
//
// A match was found and Table is NULL, so this is a delete operation.
//
gDxeCoreST->NumberOfTableEntries--;
//
// Copy over deleted entry
//
CopyMem (
&(EfiConfigurationTable[Index]),
&(gDxeCoreST->ConfigurationTable[Index + 1]),
(gDxeCoreST->NumberOfTableEntries - Index) * sizeof (EFI_CONFIGURATION_TABLE)
);
} else {
//
// No matching GUIDs were found, so this is an add operation.
//
if (Table == NULL) {
//
// If Table is NULL on an add operation, then return an error.
//
return EFI_NOT_FOUND;
}
//
// Assume that Index == gDxeCoreST->NumberOfTableEntries
//
if ((Index * sizeof (EFI_CONFIGURATION_TABLE)) >= mSystemTableAllocateSize) {
//
// Allocate a table with one additional entry.
//
mSystemTableAllocateSize += (CONFIG_TABLE_SIZE_INCREASED * sizeof (EFI_CONFIGURATION_TABLE));
EfiConfigurationTable = AllocateRuntimePool (mSystemTableAllocateSize);
if (EfiConfigurationTable == NULL) {
//
// If a new table could not be allocated, then return an error.
//
return EFI_OUT_OF_RESOURCES;
}
if (gDxeCoreST->ConfigurationTable != NULL) {
//
// Copy the old table to the new table.
//
CopyMem (
EfiConfigurationTable,
gDxeCoreST->ConfigurationTable,
Index * sizeof (EFI_CONFIGURATION_TABLE)
);
//
// Record the old table pointer.
//
OldTable = gDxeCoreST->ConfigurationTable;
//
// As the CoreInstallConfigurationTable() may be re-entered by CoreFreePool()
// in its calling stack, updating System table to the new table pointer must
// be done before calling CoreFreePool() to free the old table.
// It can make sure the gDxeCoreST->ConfigurationTable point to the new table
// and avoid the errors of use-after-free to the old table by the reenter of
// CoreInstallConfigurationTable() in CoreFreePool()'s calling stack.
//
gDxeCoreST->ConfigurationTable = EfiConfigurationTable;
//
// Free the old table after updating System Table to the new table pointer.
//
CoreFreePool (OldTable);
} else {
//
// Update System Table
//
gDxeCoreST->ConfigurationTable = EfiConfigurationTable;
}
}
//
// Fill in the new entry
//
CopyGuid ((VOID *)&EfiConfigurationTable[Index].VendorGuid, Guid);
EfiConfigurationTable[Index].VendorTable = Table;
//
// This is an add operation, so increment the number of table entries
//
gDxeCoreST->NumberOfTableEntries++;
}
//
// Fix up the CRC-32 in the EFI System Table
//
CalculateEfiHdrCrc (&gDxeCoreST->Hdr);
//
// Signal Configuration Table change
//
CoreNotifySignalList (Guid);
return EFI_SUCCESS;
}
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