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3c2dc30d KQ |
1 | /** @file\r |
2 | TCG2 SMM driver that updates TPM2 items in ACPI table and registers\r | |
3 | SMI2 callback functions for Tcg2 physical presence, ClearMemory, and\r | |
4 | sample for dTPM StartMethod.\r | |
5 | \r | |
6 | Caution: This module requires additional review when modified.\r | |
7 | This driver will have external input - variable and ACPINvs data in SMM mode.\r | |
8 | This external input must be validated carefully to avoid security issue.\r | |
9 | \r | |
10 | PhysicalPresenceCallback() and MemoryClearCallback() will receive untrusted input and do some check.\r | |
11 | \r | |
12 | Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
13 | Copyright (c) Microsoft Corporation.\r | |
14 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
18 | #include "Tcg2Smm.h"\r | |
19 | #include <Library/UefiBootServicesTableLib.h>\r | |
20 | #include <Library/SmmMemLib.h>\r | |
21 | \r | |
22 | /**\r | |
23 | Notify the system that the SMM variable driver is ready.\r | |
24 | **/\r | |
25 | VOID\r | |
26 | Tcg2NotifyMmReady (\r | |
27 | VOID\r | |
28 | )\r | |
29 | {\r | |
c411b485 MK |
30 | EFI_STATUS Status;\r |
31 | EFI_HANDLE Handle;\r | |
3c2dc30d KQ |
32 | \r |
33 | Handle = NULL;\r | |
34 | Status = gBS->InstallProtocolInterface (\r | |
35 | &Handle,\r | |
36 | &gTcg2MmSwSmiRegisteredGuid,\r | |
37 | EFI_NATIVE_INTERFACE,\r | |
38 | NULL\r | |
39 | );\r | |
40 | ASSERT_EFI_ERROR (Status);\r | |
41 | }\r | |
42 | \r | |
43 | /**\r | |
44 | This function is an abstraction layer for implementation specific Mm buffer validation routine.\r | |
45 | \r | |
46 | @param Buffer The buffer start address to be checked.\r | |
47 | @param Length The buffer length to be checked.\r | |
48 | \r | |
49 | @retval TRUE This buffer is valid per processor architecture and not overlap with SMRAM.\r | |
50 | @retval FALSE This buffer is not valid per processor architecture or overlap with SMRAM.\r | |
51 | **/\r | |
52 | BOOLEAN\r | |
53 | IsBufferOutsideMmValid (\r | |
54 | IN EFI_PHYSICAL_ADDRESS Buffer,\r | |
55 | IN UINT64 Length\r | |
56 | )\r | |
57 | {\r | |
58 | return SmmIsBufferOutsideSmmValid (Buffer, Length);\r | |
59 | }\r | |
60 | \r | |
61 | /**\r | |
62 | The driver's entry point.\r | |
63 | \r | |
64 | It install callbacks for TPM physical presence and MemoryClear, and locate\r | |
65 | SMM variable to be used in the callback function.\r | |
66 | \r | |
67 | @param[in] ImageHandle The firmware allocated handle for the EFI image.\r | |
68 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
69 | \r | |
70 | @retval EFI_SUCCESS The entry point is executed successfully.\r | |
71 | @retval Others Some error occurs when executing this entry point.\r | |
72 | \r | |
73 | **/\r | |
74 | EFI_STATUS\r | |
75 | EFIAPI\r | |
76 | InitializeTcgSmm (\r | |
c411b485 MK |
77 | IN EFI_HANDLE ImageHandle,\r |
78 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
3c2dc30d KQ |
79 | )\r |
80 | {\r | |
81 | return InitializeTcgCommon ();\r | |
82 | }\r |