MdeModulePkg/Core/Dxe/Misc/InstallConfigurationTable.c

   1 /** @file
   2   UEFI Miscellaneous boot Services InstallConfigurationTable service
   3
   4 Copyright (c) 2006 - 2008, Intel Corporation. <BR>
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <DxeMain.h>
  16
  17 #define CONFIG_TABLE_SIZE_INCREASED 0x10
  18
  19 UINTN mSystemTableAllocateSize = 0;
  20
  21
  22
  23 /**
  24   Find a config table by name in system table's ConfigurationTable.
  25
  26   @param  Guid           The table name to look for
  27   @param  Table          Pointer of the config table
  28
  29   @retval EFI_NOT_FOUND  Could not find the table in system table's
  30                          ConfigurationTable.
  31   @retval EFI_SUCCESS    Table successfully found.
  32
  33 **/
  34 EFI_STATUS
  35 CoreGetConfigTable (
  36   IN EFI_GUID *Guid,
  37   OUT VOID    **Table
  38   )
  39 {
  40   UINTN Index;
  41
  42   for (Index = 0; Index < gDxeCoreST->NumberOfTableEntries; Index++) {
  43     if (CompareGuid (Guid, &(gDxeCoreST->ConfigurationTable[Index].VendorGuid))) {
  44       *Table = gDxeCoreST->ConfigurationTable[Index].VendorTable;
  45       return EFI_SUCCESS;
  46     }
  47   }
  48
  49   return EFI_NOT_FOUND;
  50 }
  51
  52
  53
  54
  55 /**
  56   Boot Service called to add, modify, or remove a system configuration table from
  57   the EFI System Table.
  58
  59   @param  Guid           Pointer to the GUID for the entry to add, update, or
  60                          remove
  61   @param  Table          Pointer to the configuration table for the entry to add,
  62                          update, or remove, may be NULL.
  63
  64   @return EFI_SUCCESS               Guid, Table pair added, updated, or removed.
  65   @return EFI_INVALID_PARAMETER     Input GUID not valid.
  66   @return EFI_NOT_FOUND             Attempted to delete non-existant entry
  67   @return EFI_OUT_OF_RESOURCES      Not enough memory available
  68
  69 **/
  70 EFI_STATUS
  71 EFIAPI
  72 CoreInstallConfigurationTable (
  73   IN EFI_GUID *Guid,
  74   IN VOID     *Table
  75   )
  76 {
  77   UINTN                   Index;
  78   EFI_CONFIGURATION_TABLE *EfiConfigurationTable;
  79
  80   //
  81   // If Guid is NULL, then this operation cannot be performed
  82   //
  83   if (Guid == NULL) {
  84     return EFI_INVALID_PARAMETER;
  85   }
  86
  87   EfiConfigurationTable = gDxeCoreST->ConfigurationTable;
  88
  89   //
  90   // Search all the table for an entry that matches Guid
  91   //
  92   for (Index = 0; Index < gDxeCoreST->NumberOfTableEntries; Index++) {
  93     if (CompareGuid (Guid, &(gDxeCoreST->ConfigurationTable[Index].VendorGuid))) {
  94       break;
  95     }
  96   }
  97
  98   if (Index < gDxeCoreST->NumberOfTableEntries) {
  99     //
 100     // A match was found, so this is either a modify or a delete operation
 101     //
 102     if (Table != NULL) {
 103       //
 104       // If Table is not NULL, then this is a modify operation.
 105       // Modify the table enty and return.
 106       //
 107       gDxeCoreST->ConfigurationTable[Index].VendorTable = Table;
 108
 109       //
 110       // Signal Configuration Table change
 111       //
 112       CoreNotifySignalList (Guid);
 113
 114       return EFI_SUCCESS;
 115     }
 116
 117     //
 118     // A match was found and Table is NULL, so this is a delete operation.
 119     //
 120     gDxeCoreST->NumberOfTableEntries--;
 121
 122     //
 123     // Copy over deleted entry
 124     //
 125     CopyMem (
 126       &(EfiConfigurationTable[Index]),
 127       &(gDxeCoreST->ConfigurationTable[Index + 1]),
 128       (gDxeCoreST->NumberOfTableEntries - Index) * sizeof (EFI_CONFIGURATION_TABLE)
 129       );
 130
 131   } else {
 132
 133     //
 134     // No matching GUIDs were found, so this is an add operation.
 135     //
 136
 137     if (Table == NULL) {
 138       //
 139       // If Table is NULL on an add operation, then return an error.
 140       //
 141       return EFI_NOT_FOUND;
 142     }
 143
 144     //
 145     // Assume that Index == gDxeCoreST->NumberOfTableEntries
 146     //
 147     if ((Index * sizeof (EFI_CONFIGURATION_TABLE)) >= mSystemTableAllocateSize) {
 148       //
 149       // Allocate a table with one additional entry.
 150       //
 151       mSystemTableAllocateSize += (CONFIG_TABLE_SIZE_INCREASED * sizeof (EFI_CONFIGURATION_TABLE));
 152       EfiConfigurationTable = CoreAllocateRuntimePool (mSystemTableAllocateSize);
 153       if (EfiConfigurationTable == NULL) {
 154         //
 155         // If a new table could not be allocated, then return an error.
 156         //
 157         return EFI_OUT_OF_RESOURCES;
 158       }
 159
 160       if (gDxeCoreST->ConfigurationTable != NULL) {
 161         //
 162         // Copy the old table to the new table.
 163         //
 164         CopyMem (
 165           EfiConfigurationTable,
 166           gDxeCoreST->ConfigurationTable,
 167           Index * sizeof (EFI_CONFIGURATION_TABLE)
 168           );
 169
 170         //
 171         // Free Old Table
 172         //
 173         CoreFreePool (gDxeCoreST->ConfigurationTable);
 174       }
 175
 176       //
 177       // Update System Table
 178       //
 179       gDxeCoreST->ConfigurationTable = EfiConfigurationTable;
 180     }
 181
 182     //
 183     // Fill in the new entry
 184     //
 185     CopyGuid ((VOID *)&EfiConfigurationTable[Index].VendorGuid, Guid);
 186     EfiConfigurationTable[Index].VendorTable  = Table;
 187
 188     //
 189     // This is an add operation, so increment the number of table entries
 190     //
 191     gDxeCoreST->NumberOfTableEntries++;
 192   }
 193
 194   //
 195   // Fix up the CRC-32 in the EFI System Table
 196   //
 197   CalculateEfiHdrCrc (&gDxeCoreST->Hdr);
 198
 199   //
 200   // Signal Configuration Table change
 201   //
 202   CoreNotifySignalList (Guid);
 203
 204   return EFI_SUCCESS;
 205 }