EdkCompatibilityPkg/Compatibility/FrameworkHiiOnUefiHiiThunk/HiiHandle.c

   1 /** @file
   2   This file is for functins related to assign and free Framework HII handle number.
   3
   4 Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
   5 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
  16 #include "HiiHandle.h"
  17
  18 //
  19 // FRAMEWORK_EFI_HII_HANDLE
  20 //
  21 UINT8 mHandle[1024 * 8] = {0};
  22
  23 /**
  24
  25   Initialize the Framework Hii Handle database.
  26
  27 **/
  28 VOID
  29 InitHiiHandleDatabase (
  30   VOID
  31   )
  32 {
  33   //
  34   // FRAMEWORK_EFI_HII_HANDLE 0 is reserved.
  35   // Set Bit 0 in mHandle[0] to 1.
  36   //
  37   mHandle[0] |= 1 << 0;
  38 }
  39
  40 /**
  41   Allocate a new Framework HII handle.
  42
  43   @param  Handle Returns the new Framework HII Handle assigned.
  44
  45   @retval EFI_SUCCESS         A new Framework HII Handle is assigned.
  46   @retval EFI_OUT_OF_RESOURCE The Framework HII Handle database is depleted.
  47
  48 **/
  49 EFI_STATUS
  50 AllocateHiiHandle (
  51   OUT FRAMEWORK_EFI_HII_HANDLE *Handle
  52   )
  53 {
  54   UINTN       Index;
  55
  56   for (Index = 0; Index < sizeof (mHandle) * 8; Index++) {
  57     if ((mHandle[Index / 8] & (1 << (Index % 8))) == 0) {
  58       mHandle[Index / 8] = (UINT8) (mHandle[Index / 8] | (1 << (Index % 8)));
  59       *Handle = (FRAMEWORK_EFI_HII_HANDLE) Index;
  60       ASSERT (*Handle != 0);
  61       return EFI_SUCCESS;
  62     }
  63   }
  64
  65   return EFI_OUT_OF_RESOURCES;
  66 }
  67
  68 /**
  69   Free Framework HII handle.
  70
  71   @param  Handle The Framework HII Handle to be freed.
  72
  73 **/
  74 VOID
  75 FreeHiiHandle (
  76   IN FRAMEWORK_EFI_HII_HANDLE Handle
  77   )
  78 {
  79   UINT16 Num;
  80
  81   Num = (UINT16) Handle;
  82
  83   ASSERT ((mHandle [Num / 8] & (1 << (Num % 8))) != 0);
  84   mHandle [Num / 8] = (UINT8) (mHandle [Num / 8] & (~(1 << (Num % 8))));
  85 }