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1 | /** @file\r |
2 | Page table manipulation functions for IA-32 processors\r | |
3 | \r | |
4 | Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "PiSmmCpuDxeSmm.h"\r | |
16 | \r | |
17 | SPIN_LOCK mPFLock;\r | |
18 | \r | |
19 | /**\r | |
20 | Create PageTable for SMM use.\r | |
21 | \r | |
22 | @return PageTable Address\r | |
23 | \r | |
24 | **/\r | |
25 | UINT32\r | |
26 | SmmInitPageTable (\r | |
27 | VOID\r | |
28 | )\r | |
29 | {\r | |
30 | UINTN PageFaultHandlerHookAddress;\r | |
31 | IA32_IDT_GATE_DESCRIPTOR *IdtEntry;\r | |
32 | \r | |
33 | //\r | |
34 | // Initialize spin lock\r | |
35 | //\r | |
36 | InitializeSpinLock (&mPFLock);\r | |
37 | \r | |
38 | if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r | |
39 | //\r | |
40 | // Set own Page Fault entry instead of the default one, because SMM Profile\r | |
41 | // feature depends on IRET instruction to do Single Step\r | |
42 | //\r | |
43 | PageFaultHandlerHookAddress = (UINTN)PageFaultIdtHandlerSmmProfile;\r | |
44 | IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *) gcSmiIdtr.Base;\r | |
45 | IdtEntry += EXCEPT_IA32_PAGE_FAULT;\r | |
46 | IdtEntry->Bits.OffsetLow = (UINT16)PageFaultHandlerHookAddress;\r | |
47 | IdtEntry->Bits.Reserved_0 = 0;\r | |
48 | IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;\r | |
49 | IdtEntry->Bits.OffsetHigh = (UINT16)(PageFaultHandlerHookAddress >> 16);\r | |
50 | } else {\r | |
51 | //\r | |
52 | // Register SMM Page Fault Handler\r | |
53 | //\r | |
54 | SmmRegisterExceptionHandler (&mSmmCpuService, EXCEPT_IA32_PAGE_FAULT, SmiPFHandler);\r | |
55 | }\r | |
56 | \r | |
57 | //\r | |
58 | // Additional SMM IDT initialization for SMM stack guard\r | |
59 | //\r | |
60 | if (FeaturePcdGet (PcdCpuSmmStackGuard)) {\r | |
61 | InitializeIDTSmmStackGuard ();\r | |
62 | }\r | |
63 | return Gen4GPageTable (0);\r | |
64 | }\r | |
65 | \r | |
66 | /**\r | |
67 | Page Fault handler for SMM use.\r | |
68 | \r | |
69 | **/\r | |
70 | VOID\r | |
71 | SmiDefaultPFHandler (\r | |
72 | VOID\r | |
73 | )\r | |
74 | {\r | |
75 | CpuDeadLoop ();\r | |
76 | }\r | |
77 | \r | |
78 | /**\r | |
79 | ThePage Fault handler wrapper for SMM use.\r | |
80 | \r | |
81 | @param InterruptType Defines the type of interrupt or exception that\r | |
82 | occurred on the processor.This parameter is processor architecture specific.\r | |
83 | @param SystemContext A pointer to the processor context when\r | |
84 | the interrupt occurred on the processor.\r | |
85 | **/\r | |
86 | VOID\r | |
87 | EFIAPI\r | |
88 | SmiPFHandler (\r | |
89 | IN EFI_EXCEPTION_TYPE InterruptType,\r | |
90 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
91 | )\r | |
92 | {\r | |
93 | UINTN PFAddress;\r | |
94 | \r | |
95 | ASSERT (InterruptType == EXCEPT_IA32_PAGE_FAULT);\r | |
96 | \r | |
97 | AcquireSpinLock (&mPFLock);\r | |
98 | \r | |
99 | PFAddress = AsmReadCr2 ();\r | |
100 | \r | |
101 | if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&\r | |
102 | (PFAddress >= mCpuHotPlugData.SmrrBase) &&\r | |
103 | (PFAddress < (mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize))) {\r | |
104 | DEBUG ((EFI_D_ERROR, "SMM stack overflow!\n"));\r | |
105 | CpuDeadLoop ();\r | |
106 | }\r | |
107 | \r | |
108 | //\r | |
109 | // If a page fault occurs in SMM range\r | |
110 | //\r | |
111 | if ((PFAddress < mCpuHotPlugData.SmrrBase) ||\r | |
112 | (PFAddress >= mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize)) {\r | |
113 | if ((SystemContext.SystemContextIa32->ExceptionData & IA32_PF_EC_ID) != 0) {\r | |
114 | DEBUG ((EFI_D_ERROR, "Code executed on IP(0x%x) out of SMM range after SMM is locked!\n", PFAddress));\r | |
115 | DEBUG_CODE (\r | |
116 | DumpModuleInfoByIp (*(UINTN *)(UINTN)SystemContext.SystemContextIa32->Esp);\r | |
117 | );\r | |
118 | CpuDeadLoop ();\r | |
119 | }\r | |
120 | }\r | |
121 | \r | |
122 | if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r | |
123 | SmmProfilePFHandler (\r | |
124 | SystemContext.SystemContextIa32->Eip,\r | |
125 | SystemContext.SystemContextIa32->ExceptionData\r | |
126 | );\r | |
127 | } else {\r | |
128 | SmiDefaultPFHandler ();\r | |
129 | }\r | |
130 | \r | |
131 | ReleaseSpinLock (&mPFLock);\r | |
132 | }\r |