1 /** @file
2 Support ResetSystem Runtime call using PSCI calls
3
4 Note: A similar library is implemented in
5 ArmPkg/Library/ArmPsciResetSystemLib. Similar issues might
6 exist in this implementation too.
7
8 Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
9 Copyright (c) 2013, ARM Ltd. All rights reserved.<BR>
10 Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
11
12 This program and the accompanying materials
13 are licensed and made available under the terms and conditions of the BSD License
14 which accompanies this distribution. The full text of the license may be found at
15 http://opensource.org/licenses/bsd-license.php
16
17 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
18 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19
20 **/
21
22 #include <PiDxe.h>
23
24 #include <Library/BaseLib.h>
25 #include <Library/DebugLib.h>
26 #include <Library/EfiResetSystemLib.h>
27 #include <Library/ArmSmcLib.h>
28 #include <Library/ArmHvcLib.h>
29 #include <Library/UefiBootServicesTableLib.h>
30
31 #include <IndustryStandard/ArmStdSmc.h>
32
33 #include <Protocol/FdtClient.h>
34
35 STATIC UINT32 mArmPsciMethod;
36
37 RETURN_STATUS
38 EFIAPI
ArmPsciResetSystemLibConstructor(VOID)39 ArmPsciResetSystemLibConstructor (
40 VOID
41 )
42 {
43 EFI_STATUS Status;
44 FDT_CLIENT_PROTOCOL *FdtClient;
45 CONST VOID *Prop;
46
47 Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
48 (VOID **)&FdtClient);
49 ASSERT_EFI_ERROR (Status);
50
51 Status = FdtClient->FindCompatibleNodeProperty (FdtClient, "arm,psci-0.2",
52 "method", &Prop, NULL);
53 if (EFI_ERROR (Status)) {
54 return Status;
55 }
56
57 if (AsciiStrnCmp (Prop, "hvc", 3) == 0) {
58 mArmPsciMethod = 1;
59 } else if (AsciiStrnCmp (Prop, "smc", 3) == 0) {
60 mArmPsciMethod = 2;
61 } else {
62 DEBUG ((EFI_D_ERROR, "%a: Unknown PSCI method \"%a\"\n", __FUNCTION__,
63 Prop));
64 return EFI_NOT_FOUND;
65 }
66 return EFI_SUCCESS;
67 }
68
69 /**
70 Resets the entire platform.
71
72 @param ResetType The type of reset to perform.
73 @param ResetStatus The status code for the reset.
74 @param DataSize The size, in bytes, of WatchdogData.
75 @param ResetData For a ResetType of EfiResetCold, EfiResetWarm, or
76 EfiResetShutdown the data buffer starts with a Null-terminated
77 Unicode string, optionally followed by additional binary data.
78
79 **/
80 EFI_STATUS
81 EFIAPI
LibResetSystem(IN EFI_RESET_TYPE ResetType,IN EFI_STATUS ResetStatus,IN UINTN DataSize,IN CHAR16 * ResetData OPTIONAL)82 LibResetSystem (
83 IN EFI_RESET_TYPE ResetType,
84 IN EFI_STATUS ResetStatus,
85 IN UINTN DataSize,
86 IN CHAR16 *ResetData OPTIONAL
87 )
88 {
89 ARM_SMC_ARGS ArmSmcArgs;
90 ARM_HVC_ARGS ArmHvcArgs;
91
92 switch (ResetType) {
93
94 case EfiResetPlatformSpecific:
95 // Map the platform specific reset as reboot
96 case EfiResetWarm:
97 // Map a warm reset into a cold reset
98 case EfiResetCold:
99 // Send a PSCI 0.2 SYSTEM_RESET command
100 ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
101 ArmHvcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
102 break;
103 case EfiResetShutdown:
104 // Send a PSCI 0.2 SYSTEM_OFF command
105 ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
106 ArmHvcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
107 break;
108 default:
109 ASSERT (FALSE);
110 return EFI_UNSUPPORTED;
111 }
112
113 switch (mArmPsciMethod) {
114 case 1:
115 ArmCallHvc (&ArmHvcArgs);
116 break;
117
118 case 2:
119 ArmCallSmc (&ArmSmcArgs);
120 break;
121
122 default:
123 DEBUG ((EFI_D_ERROR, "%a: no PSCI method defined\n", __FUNCTION__));
124 return EFI_UNSUPPORTED;
125 }
126
127 // We should never be here
128 DEBUG ((EFI_D_ERROR, "%a: PSCI Reset failed\n", __FUNCTION__));
129 CpuDeadLoop ();
130 return EFI_UNSUPPORTED;
131 }
132
133 /**
134 Initialize any infrastructure required for LibResetSystem () to function.
135
136 @param ImageHandle The firmware allocated handle for the EFI image.
137 @param SystemTable A pointer to the EFI System Table.
138
139 @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
140
141 **/
142 EFI_STATUS
143 EFIAPI
LibInitializeResetSystem(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE * SystemTable)144 LibInitializeResetSystem (
145 IN EFI_HANDLE ImageHandle,
146 IN EFI_SYSTEM_TABLE *SystemTable
147 )
148 {
149 return EFI_SUCCESS;
150 }
151