MdeModulePkg/FaultTolerantWriteDxe: implement standalone MM version
[mirror_edk2.git] / MdeModulePkg / Universal / FaultTolerantWriteDxe / FaultTolerantWriteStandaloneMm.c
1 /** @file
2
3 Parts of the SMM/MM implementation that are specific to standalone MM
4
5 Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
6 Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include <Library/SmmMemLib.h>
18 #include <Library/UefiBootServicesTableLib.h>
19 #include "FaultTolerantWrite.h"
20 #include "FaultTolerantWriteSmmCommon.h"
21
22 /**
23 This function checks if the buffer is valid per processor architecture and
24 does not overlap with SMRAM.
25
26 @param Buffer The buffer start address to be checked.
27 @param Length The buffer length to be checked.
28
29 @retval TRUE This buffer is valid per processor architecture and does not
30 overlap with SMRAM.
31 @retval FALSE This buffer is not valid per processor architecture or overlaps
32 with SMRAM.
33 **/
34 BOOLEAN
35 FtwSmmIsBufferOutsideSmmValid (
36 IN EFI_PHYSICAL_ADDRESS Buffer,
37 IN UINT64 Length
38 )
39 {
40 return TRUE;
41 }
42
43 /**
44 Internal implementation of CRC32. Depending on the execution context
45 (standalone SMM or DXE vs standalone MM), this function is implemented
46 via a call to the CalculateCrc32 () boot service, or via a library
47 call.
48
49 If Buffer is NULL, then ASSERT().
50 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
51
52 @param[in] Buffer A pointer to the buffer on which the 32-bit CRC is to be computed.
53 @param[in] Length The number of bytes in the buffer Data.
54
55 @retval Crc32 The 32-bit CRC was computed for the data buffer.
56
57 **/
58 UINT32
59 FtwCalculateCrc32 (
60 IN VOID *Buffer,
61 IN UINTN Length
62 )
63 {
64 return CalculateCrc32 (Buffer, Length);
65 }
66
67 /**
68 Notify the system that the SMM FTW driver is ready
69 **/
70 VOID
71 FtwNotifySmmReady (
72 VOID
73 )
74 {
75 }
76
77 /**
78 This function is the entry point of the Fault Tolerant Write driver.
79
80 @param[in] ImageHandle A handle for the image that is initializing this driver
81 @param[in] MmSystemTable A pointer to the MM system table
82
83 @retval EFI_SUCCESS The initialization finished successfully.
84 @retval EFI_OUT_OF_RESOURCES Allocate memory error
85 @retval EFI_INVALID_PARAMETER Workspace or Spare block does not exist
86
87 **/
88 EFI_STATUS
89 EFIAPI
90 StandaloneMmFaultTolerantWriteInitialize (
91 IN EFI_HANDLE ImageHandle,
92 IN EFI_MM_SYSTEM_TABLE *MmSystemTable
93 )
94 {
95 return MmFaultTolerantWriteInitialize ();
96 }