1 /** @file
2 Semaphore mechanism to indicate to the BSP that an AP has exited SMM
3 after SMBASE relocation.
4 
5 Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
6 This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution.  The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
10 
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13 
14 **/
15 
16 #include "PiSmmCpuDxeSmm.h"
17 
18 extern  UINT32    mSmmRelocationOriginalAddressPtr32;
19 extern  UINT32    mRebasedFlagAddr32;
20 
21 UINTN             mSmmRelocationOriginalAddress;
22 volatile BOOLEAN  *mRebasedFlag;
23 
24 /**
25 AP Semaphore operation in 32-bit mode while BSP runs in 64-bit mode.
26 **/
27 VOID
28 SmmRelocationSemaphoreComplete32 (
29   VOID
30   );
31 
32 /**
33   Hook return address of SMM Save State so that semaphore code
34   can be executed immediately after AP exits SMM to indicate to
35   the BSP that an AP has exited SMM after SMBASE relocation.
36 
37   @param[in] CpuIndex     The processor index.
38   @param[in] RebasedFlag  A pointer to a flag that is set to TRUE
39                           immediately after AP exits SMM.
40 
41 **/
42 VOID
SemaphoreHook(IN UINTN CpuIndex,IN volatile BOOLEAN * RebasedFlag)43 SemaphoreHook (
44   IN UINTN             CpuIndex,
45   IN volatile BOOLEAN  *RebasedFlag
46   )
47 {
48   SMRAM_SAVE_STATE_MAP  *CpuState;
49   UINTN                 TempValue;
50 
51   mRebasedFlag       = RebasedFlag;
52   mRebasedFlagAddr32 = (UINT32)(UINTN)mRebasedFlag;
53 
54   CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET);
55   mSmmRelocationOriginalAddress = HookReturnFromSmm (
56                                     CpuIndex,
57                                     CpuState,
58                                     (UINT64)(UINTN)&SmmRelocationSemaphoreComplete32,
59                                     (UINT64)(UINTN)&SmmRelocationSemaphoreComplete
60                                     );
61 
62   //
63   // Use temp value to fix ICC complier warning
64   //
65   TempValue = (UINTN)&mSmmRelocationOriginalAddress;
66   mSmmRelocationOriginalAddressPtr32 = (UINT32)TempValue;
67 }
68