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1 | /** @file\r |
2 | ResetSystemLib implementation using PSCI calls\r | |
3 | \r | |
6556224e | 4 | Copyright (c) 2017 - 2018, Linaro Ltd. All rights reserved.<BR>\r |
b2c55e73 AB |
5 | \r |
6 | This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <PiDxe.h>\r | |
17 | \r | |
dde2dd64 AB |
18 | #include <Library/ArmMmuLib.h>\r |
19 | #include <Library/ArmSmcLib.h>\r | |
b2c55e73 AB |
20 | #include <Library/BaseLib.h>\r |
21 | #include <Library/DebugLib.h>\r | |
22 | #include <Library/ResetSystemLib.h>\r | |
dde2dd64 AB |
23 | #include <Library/UefiBootServicesTableLib.h>\r |
24 | #include <Library/UefiRuntimeLib.h>\r | |
b2c55e73 AB |
25 | \r |
26 | #include <IndustryStandard/ArmStdSmc.h>\r | |
27 | \r | |
28 | /**\r | |
29 | This function causes a system-wide reset (cold reset), in which\r | |
30 | all circuitry within the system returns to its initial state. This type of reset\r | |
31 | is asynchronous to system operation and operates without regard to\r | |
32 | cycle boundaries.\r | |
33 | \r | |
34 | If this function returns, it means that the system does not support cold reset.\r | |
35 | **/\r | |
36 | VOID\r | |
37 | EFIAPI\r | |
38 | ResetCold (\r | |
39 | VOID\r | |
40 | )\r | |
41 | {\r | |
42 | ARM_SMC_ARGS ArmSmcArgs;\r | |
43 | \r | |
44 | // Send a PSCI 0.2 SYSTEM_RESET command\r | |
45 | ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;\r | |
46 | ArmCallSmc (&ArmSmcArgs);\r | |
47 | }\r | |
48 | \r | |
49 | /**\r | |
50 | This function causes a system-wide initialization (warm reset), in which all processors\r | |
51 | are set to their initial state. Pending cycles are not corrupted.\r | |
52 | \r | |
53 | If this function returns, it means that the system does not support warm reset.\r | |
54 | **/\r | |
55 | VOID\r | |
56 | EFIAPI\r | |
57 | ResetWarm (\r | |
58 | VOID\r | |
59 | )\r | |
60 | {\r | |
61 | // Map a warm reset into a cold reset\r | |
62 | ResetCold ();\r | |
63 | }\r | |
64 | \r | |
65 | /**\r | |
66 | This function causes the system to enter a power state equivalent\r | |
67 | to the ACPI G2/S5 or G3 states.\r | |
68 | \r | |
69 | If this function returns, it means that the system does not support shutdown reset.\r | |
70 | **/\r | |
71 | VOID\r | |
72 | EFIAPI\r | |
73 | ResetShutdown (\r | |
74 | VOID\r | |
75 | )\r | |
76 | {\r | |
77 | ARM_SMC_ARGS ArmSmcArgs;\r | |
78 | \r | |
79 | // Send a PSCI 0.2 SYSTEM_OFF command\r | |
80 | ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;\r | |
81 | ArmCallSmc (&ArmSmcArgs);\r | |
82 | }\r | |
83 | \r | |
6556224e AB |
84 | VOID DisableMmuAndReenterPei (VOID);\r |
85 | \r | |
b2c55e73 AB |
86 | /**\r |
87 | This function causes the system to enter S3 and then wake up immediately.\r | |
88 | \r | |
89 | If this function returns, it means that the system does not support S3 feature.\r | |
90 | **/\r | |
91 | VOID\r | |
92 | EFIAPI\r | |
93 | EnterS3WithImmediateWake (\r | |
94 | VOID\r | |
95 | )\r | |
96 | {\r | |
6556224e AB |
97 | EFI_PHYSICAL_ADDRESS Alloc;\r |
98 | EFI_MEMORY_DESCRIPTOR *MemMap;\r | |
99 | UINTN MemMapSize;\r | |
100 | UINTN MapKey, DescriptorSize;\r | |
101 | UINT32 DescriptorVersion;\r | |
102 | EFI_STATUS Status;\r | |
dde2dd64 AB |
103 | \r |
104 | if (FeaturePcdGet (PcdArmReenterPeiForCapsuleWarmReboot) &&\r | |
105 | !EfiAtRuntime ()) {\r | |
106 | //\r | |
107 | // At boot time, we are the only core running, so we can implement the\r | |
108 | // immediate wake (which is used by capsule update) by disabling the MMU\r | |
109 | // and interrupts, and jumping to the PEI entry point.\r | |
110 | //\r | |
dde2dd64 | 111 | \r |
6556224e AB |
112 | //\r |
113 | // Obtain the size of the memory map\r | |
114 | //\r | |
115 | MemMapSize = 0;\r | |
116 | MemMap = NULL;\r | |
117 | Status = gBS->GetMemoryMap (&MemMapSize, MemMap, &MapKey, &DescriptorSize,\r | |
118 | &DescriptorVersion);\r | |
119 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
120 | \r | |
121 | //\r | |
122 | // Add some slack to the allocation to cater for changes in the memory\r | |
123 | // map if ExitBootServices () fails the first time around.\r | |
124 | //\r | |
125 | MemMapSize += SIZE_4KB;\r | |
126 | Status = gBS->AllocatePages (AllocateAnyPages, EfiBootServicesData,\r | |
127 | EFI_SIZE_TO_PAGES (MemMapSize), &Alloc);\r | |
128 | ASSERT_EFI_ERROR (Status);\r | |
129 | \r | |
130 | MemMap = (EFI_MEMORY_DESCRIPTOR *)(UINTN)Alloc;\r | |
131 | \r | |
132 | Status = gBS->GetMemoryMap (&MemMapSize, MemMap, &MapKey, &DescriptorSize,\r | |
133 | &DescriptorVersion);\r | |
134 | ASSERT_EFI_ERROR (Status);\r | |
135 | \r | |
136 | Status = gBS->ExitBootServices (gImageHandle, MapKey);\r | |
137 | if (EFI_ERROR (Status)) {\r | |
138 | //\r | |
139 | // ExitBootServices () may fail the first time around if an event fired\r | |
140 | // right after the call to GetMemoryMap() which allocated or freed memory.\r | |
141 | // Since that first call to ExitBootServices () will disarm the timer,\r | |
142 | // this is guaranteed not to happen again, so one additional attempt\r | |
143 | // should suffice.\r | |
144 | //\r | |
145 | Status = gBS->GetMemoryMap (&MemMapSize, MemMap, &MapKey, &DescriptorSize,\r | |
146 | &DescriptorVersion);\r | |
147 | ASSERT_EFI_ERROR (Status);\r | |
148 | \r | |
149 | Status = gBS->ExitBootServices (gImageHandle, MapKey);\r | |
150 | ASSERT_EFI_ERROR (Status);\r | |
151 | }\r | |
152 | \r | |
153 | DisableMmuAndReenterPei ();\r | |
dde2dd64 | 154 | }\r |
b2c55e73 AB |
155 | }\r |
156 | \r | |
157 | /**\r | |
158 | This function causes a systemwide reset. The exact type of the reset is\r | |
159 | defined by the EFI_GUID that follows the Null-terminated Unicode string passed\r | |
160 | into ResetData. If the platform does not recognize the EFI_GUID in ResetData\r | |
161 | the platform must pick a supported reset type to perform.The platform may\r | |
162 | optionally log the parameters from any non-normal reset that occurs.\r | |
163 | \r | |
164 | @param[in] DataSize The size, in bytes, of ResetData.\r | |
165 | @param[in] ResetData The data buffer starts with a Null-terminated string,\r | |
166 | followed by the EFI_GUID.\r | |
167 | **/\r | |
168 | VOID\r | |
169 | EFIAPI\r | |
170 | ResetPlatformSpecific (\r | |
171 | IN UINTN DataSize,\r | |
172 | IN VOID *ResetData\r | |
173 | )\r | |
174 | {\r | |
175 | // Map the platform specific reset as reboot\r | |
176 | ResetCold ();\r | |
177 | }\r |