3 Copyright (c) 2016 HP Development Company, L.P.
4 Copyright (c) 2016 - 2021, Arm Limited. All rights reserved.
6 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <Pi/PiMmCis.h>
14 #include <Library/ArmSvcLib.h>
15 #include <Library/ArmLib.h>
16 #include <Library/BaseMemoryLib.h>
17 #include <Library/DebugLib.h>
18 #include <Library/HobLib.h>
20 #include <Protocol/DebugSupport.h> // for EFI_SYSTEM_CONTEXT
22 #include <Guid/ZeroGuid.h>
23 #include <Guid/MmramMemoryReserve.h>
25 #include <IndustryStandard/ArmStdSmc.h>
27 #include "StandaloneMmCpu.h"
31 MmFoundationEntryRegister (
32 IN CONST EFI_MM_CONFIGURATION_PROTOCOL
*This
,
33 IN EFI_MM_ENTRY_POINT MmEntryPoint
37 // On ARM platforms every event is expected to have a GUID associated with
38 // it. It will be used by the MM Entry point to find the handler for the
39 // event. It will either be populated in a EFI_MM_COMMUNICATE_HEADER by the
40 // caller of the event (e.g. MM_COMMUNICATE SMC) or by the CPU driver
41 // (e.g. during an asynchronous event). In either case, this context is
42 // maintained in an array which has an entry for each CPU. The pointer to this
43 // array is held in PerCpuGuidedEventContext. Memory is allocated once the
44 // number of CPUs in the system are made known through the
45 // MP_INFORMATION_HOB_DATA.
47 EFI_MM_COMMUNICATE_HEADER
**PerCpuGuidedEventContext
= NULL
;
49 // Descriptor with whereabouts of memory used for communication with the normal world
50 EFI_MMRAM_DESCRIPTOR mNsCommBuffer
;
52 MP_INFORMATION_HOB_DATA
*mMpInformationHobData
;
54 EFI_MM_CONFIGURATION_PROTOCOL mMmConfig
= {
56 MmFoundationEntryRegister
59 STATIC EFI_MM_ENTRY_POINT mMmEntryPoint
= NULL
;
62 PiMmStandaloneArmTfCpuDriverEntry (
65 IN UINTN NsCommBufferAddr
68 EFI_MM_COMMUNICATE_HEADER
*GuidedEventContext
;
69 EFI_MM_ENTRY_CONTEXT MmEntryPointContext
;
71 UINTN NsCommBufferSize
;
73 DEBUG ((DEBUG_INFO
, "Received event - 0x%x on cpu %d\n", EventId
, CpuNumber
));
77 // ARM TF passes SMC FID of the MM_COMMUNICATE interface as the Event ID upon
78 // receipt of a synchronous MM request. Use the Event ID to distinguish
79 // between synchronous and asynchronous events.
81 if (ARM_SMC_ID_MM_COMMUNICATE_AARCH64
!= EventId
) {
82 DEBUG ((DEBUG_INFO
, "UnRecognized Event - 0x%x\n", EventId
));
83 return EFI_INVALID_PARAMETER
;
86 // Perform parameter validation of NsCommBufferAddr
87 if (NsCommBufferAddr
== (UINTN
)NULL
) {
88 return EFI_INVALID_PARAMETER
;
91 if (NsCommBufferAddr
< mNsCommBuffer
.PhysicalStart
) {
92 return EFI_ACCESS_DENIED
;
95 if ((NsCommBufferAddr
+ sizeof (EFI_MM_COMMUNICATE_HEADER
)) >=
96 (mNsCommBuffer
.PhysicalStart
+ mNsCommBuffer
.PhysicalSize
)) {
97 return EFI_INVALID_PARAMETER
;
100 // Find out the size of the buffer passed
101 NsCommBufferSize
= ((EFI_MM_COMMUNICATE_HEADER
*) NsCommBufferAddr
)->MessageLength
+
102 sizeof (EFI_MM_COMMUNICATE_HEADER
);
104 // perform bounds check.
105 if (NsCommBufferAddr
+ NsCommBufferSize
>=
106 mNsCommBuffer
.PhysicalStart
+ mNsCommBuffer
.PhysicalSize
) {
107 return EFI_ACCESS_DENIED
;
110 GuidedEventContext
= NULL
;
111 // Now that the secure world can see the normal world buffer, allocate
112 // memory to copy the communication buffer to the secure world.
113 Status
= mMmst
->MmAllocatePool (
114 EfiRuntimeServicesData
,
116 (VOID
**) &GuidedEventContext
119 if (Status
!= EFI_SUCCESS
) {
120 DEBUG ((DEBUG_INFO
, "Mem alloc failed - 0x%x\n", EventId
));
121 return EFI_OUT_OF_RESOURCES
;
124 // X1 contains the VA of the normal world memory accessible from
126 CopyMem (GuidedEventContext
, (CONST VOID
*) NsCommBufferAddr
, NsCommBufferSize
);
128 // Stash the pointer to the allocated Event Context for this CPU
129 PerCpuGuidedEventContext
[CpuNumber
] = GuidedEventContext
;
131 ZeroMem (&MmEntryPointContext
, sizeof (EFI_MM_ENTRY_CONTEXT
));
133 MmEntryPointContext
.CurrentlyExecutingCpu
= CpuNumber
;
134 MmEntryPointContext
.NumberOfCpus
= mMpInformationHobData
->NumberOfProcessors
;
136 // Populate the MM system table with MP and state information
137 mMmst
->CurrentlyExecutingCpu
= CpuNumber
;
138 mMmst
->NumberOfCpus
= mMpInformationHobData
->NumberOfProcessors
;
139 mMmst
->CpuSaveStateSize
= 0;
140 mMmst
->CpuSaveState
= NULL
;
142 if (mMmEntryPoint
== NULL
) {
143 DEBUG ((DEBUG_INFO
, "Mm Entry point Not Found\n"));
144 return EFI_UNSUPPORTED
;
147 mMmEntryPoint (&MmEntryPointContext
);
149 // Free the memory allocation done earlier and reset the per-cpu context
150 ASSERT (GuidedEventContext
);
151 CopyMem ((VOID
*)NsCommBufferAddr
, (CONST VOID
*) GuidedEventContext
, NsCommBufferSize
);
153 Status
= mMmst
->MmFreePool ((VOID
*) GuidedEventContext
);
154 if (Status
!= EFI_SUCCESS
) {
155 return EFI_OUT_OF_RESOURCES
;
157 PerCpuGuidedEventContext
[CpuNumber
] = NULL
;
164 MmFoundationEntryRegister (
165 IN CONST EFI_MM_CONFIGURATION_PROTOCOL
*This
,
166 IN EFI_MM_ENTRY_POINT MmEntryPoint
169 // store the entry point in a global
170 mMmEntryPoint
= MmEntryPoint
;
175 This function is the main entry point for an MM handler dispatch
176 or communicate-based callback.
178 @param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().
179 @param Context Points to an optional handler context which was specified when the handler was registered.
180 @param CommBuffer A pointer to a collection of data in memory that will
181 be conveyed from a non-MM environment into an MM environment.
182 @param CommBufferSize The size of the CommBuffer.
189 PiMmCpuTpFwRootMmiHandler (
190 IN EFI_HANDLE DispatchHandle
,
191 IN CONST VOID
*Context
, OPTIONAL
192 IN OUT VOID
*CommBuffer
, OPTIONAL
193 IN OUT UINTN
*CommBufferSize OPTIONAL
199 ASSERT (Context
== NULL
);
200 ASSERT (CommBuffer
== NULL
);
201 ASSERT (CommBufferSize
== NULL
);
203 CpuNumber
= mMmst
->CurrentlyExecutingCpu
;
204 if (PerCpuGuidedEventContext
[CpuNumber
] == NULL
) {
205 return EFI_NOT_FOUND
;
208 DEBUG ((DEBUG_INFO
, "CommBuffer - 0x%x, CommBufferSize - 0x%x\n",
209 PerCpuGuidedEventContext
[CpuNumber
],
210 PerCpuGuidedEventContext
[CpuNumber
]->MessageLength
));
212 Status
= mMmst
->MmiManage (
213 &PerCpuGuidedEventContext
[CpuNumber
]->HeaderGuid
,
215 PerCpuGuidedEventContext
[CpuNumber
]->Data
,
216 &PerCpuGuidedEventContext
[CpuNumber
]->MessageLength
219 if (Status
!= EFI_SUCCESS
) {
220 DEBUG ((DEBUG_WARN
, "Unable to manage Guided Event - %d\n", Status
));