2 CPU exception handler library implementation for PEIM module.
4 Copyright (c) 2016 - 2022, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
10 #include "CpuExceptionCommon.h"
11 #include <Library/DebugLib.h>
12 #include <Library/HobLib.h>
13 #include <Library/MemoryAllocationLib.h>
14 #include <Library/PcdLib.h>
16 CONST UINTN mDoFarReturnFlag
= 0;
19 UINT8 ExceptionStubHeader
[HOOKAFTER_STUB_SIZE
];
20 EXCEPTION_HANDLER_DATA
*ExceptionHandlerData
;
21 } EXCEPTION0_STUB_HEADER
;
24 Get exception handler data pointer from IDT[0].
26 The exception #0 stub header is duplicated in an allocated pool with extra 4-byte/8-byte to store the
27 exception handler data. The new allocated memory layout follows structure EXCEPTION0_STUB_HEADER.
28 The code assumes that all processors uses the same exception handler for #0 exception.
30 @return pointer to exception handler data.
32 EXCEPTION_HANDLER_DATA
*
33 GetExceptionHandlerData (
37 IA32_DESCRIPTOR IdtDescriptor
;
38 IA32_IDT_GATE_DESCRIPTOR
*IdtTable
;
39 EXCEPTION0_STUB_HEADER
*Exception0StubHeader
;
41 AsmReadIdtr (&IdtDescriptor
);
42 IdtTable
= (IA32_IDT_GATE_DESCRIPTOR
*)IdtDescriptor
.Base
;
44 Exception0StubHeader
= (EXCEPTION0_STUB_HEADER
*)ArchGetIdtHandler (&IdtTable
[0]);
45 return Exception0StubHeader
->ExceptionHandlerData
;
49 Set exception handler data pointer to IDT[0].
51 The exception #0 stub header is duplicated in an allocated pool with extra 4-byte/8-byte to store the
52 exception handler data. The new allocated memory layout follows structure EXCEPTION0_STUB_HEADER.
53 The code assumes that all processors uses the same exception handler for #0 exception.
55 @param ExceptionHandlerData pointer to exception handler data.
58 SetExceptionHandlerData (
59 IN EXCEPTION_HANDLER_DATA
*ExceptionHandlerData
62 EXCEPTION0_STUB_HEADER
*Exception0StubHeader
;
63 IA32_DESCRIPTOR IdtDescriptor
;
64 IA32_IDT_GATE_DESCRIPTOR
*IdtTable
;
67 // Duplicate the exception #0 stub header in pool and cache the ExceptionHandlerData just after the stub header.
68 // So AP can get the ExceptionHandlerData by reading the IDT[0].
70 AsmReadIdtr (&IdtDescriptor
);
71 IdtTable
= (IA32_IDT_GATE_DESCRIPTOR
*)IdtDescriptor
.Base
;
73 Exception0StubHeader
= AllocatePool (sizeof (*Exception0StubHeader
));
74 ASSERT (Exception0StubHeader
!= NULL
);
76 Exception0StubHeader
->ExceptionStubHeader
,
77 (VOID
*)ArchGetIdtHandler (&IdtTable
[0]),
78 sizeof (Exception0StubHeader
->ExceptionStubHeader
)
80 Exception0StubHeader
->ExceptionHandlerData
= ExceptionHandlerData
;
81 ArchUpdateIdtEntry (&IdtTable
[0], (UINTN
)Exception0StubHeader
->ExceptionStubHeader
);
85 Common exception handler.
87 @param ExceptionType Exception type.
88 @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.
92 CommonExceptionHandler (
93 IN EFI_EXCEPTION_TYPE ExceptionType
,
94 IN EFI_SYSTEM_CONTEXT SystemContext
97 EXCEPTION_HANDLER_DATA
*ExceptionHandlerData
;
99 ExceptionHandlerData
= GetExceptionHandlerData ();
100 CommonExceptionHandlerWorker (ExceptionType
, SystemContext
, ExceptionHandlerData
);
104 Initializes all CPU exceptions entries and provides the default exception handlers.
106 Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
107 persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
108 If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
109 If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
110 Note: Before invoking this API, caller must allocate memory for IDT table and load
111 IDTR by AsmWriteIdtr().
113 @param[in] VectorInfo Pointer to reserved vector list.
115 @retval EFI_SUCCESS CPU Exception Entries have been successfully initialized
116 with default exception handlers.
117 @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
118 @retval EFI_UNSUPPORTED This function is not supported.
123 InitializeCpuExceptionHandlers (
124 IN EFI_VECTOR_HANDOFF_INFO
*VectorInfo OPTIONAL
128 EXCEPTION_HANDLER_DATA
*ExceptionHandlerData
;
129 RESERVED_VECTORS_DATA
*ReservedVectors
;
131 ReservedVectors
= AllocatePool (sizeof (RESERVED_VECTORS_DATA
) * CPU_EXCEPTION_NUM
);
132 ASSERT (ReservedVectors
!= NULL
);
134 ExceptionHandlerData
= AllocatePool (sizeof (EXCEPTION_HANDLER_DATA
));
135 ASSERT (ExceptionHandlerData
!= NULL
);
136 ExceptionHandlerData
->IdtEntryCount
= CPU_EXCEPTION_NUM
;
137 ExceptionHandlerData
->ReservedVectors
= ReservedVectors
;
138 ExceptionHandlerData
->ExternalInterruptHandler
= NULL
;
139 InitializeSpinLock (&ExceptionHandlerData
->DisplayMessageSpinLock
);
141 Status
= InitializeCpuExceptionHandlersWorker (VectorInfo
, ExceptionHandlerData
);
142 if (EFI_ERROR (Status
)) {
143 FreePool (ReservedVectors
);
144 FreePool (ExceptionHandlerData
);
148 SetExceptionHandlerData (ExceptionHandlerData
);
153 Initializes all CPU exceptions entries with optional extra initializations.
155 By default, this method should include all functionalities implemented by
156 InitializeCpuExceptionHandlers(), plus extra initialization works, if any.
157 This could be done by calling InitializeCpuExceptionHandlers() directly
158 in this method besides the extra works.
160 InitData is optional and its use and content are processor arch dependent.
161 The typical usage of it is to convey resources which have to be reserved
162 elsewhere and are necessary for the extra initializations of exception.
164 @param[in] VectorInfo Pointer to reserved vector list.
165 @param[in] InitData Pointer to data optional for extra initializations
168 @retval EFI_SUCCESS The exceptions have been successfully
170 @retval EFI_INVALID_PARAMETER VectorInfo or InitData contains invalid
176 InitializeCpuExceptionHandlersEx (
177 IN EFI_VECTOR_HANDOFF_INFO
*VectorInfo OPTIONAL
,
178 IN CPU_EXCEPTION_INIT_DATA
*InitData OPTIONAL
184 // To avoid repeat initialization of default handlers, the caller should pass
185 // an extended init data with InitDefaultHandlers set to FALSE. There's no
186 // need to call this method to just initialize default handlers. Call non-ex
187 // version instead; or this method must be implemented as a simple wrapper of
188 // non-ex version of it, if this version has to be called.
190 if ((InitData
== NULL
) || InitData
->Ia32
.InitDefaultHandlers
) {
191 Status
= InitializeCpuExceptionHandlers (VectorInfo
);
193 Status
= EFI_SUCCESS
;
196 if (!EFI_ERROR (Status
)) {
198 // Initializing stack switch is only necessary for Stack Guard functionality.
200 if (PcdGetBool (PcdCpuStackGuard
) && (InitData
!= NULL
)) {
201 Status
= ArchSetupExceptionStack (InitData
);