1 /** @file
2 Support ResetSystem Runtime call using PSCI calls
3
4 Note: A similar library is implemented in
5 ArmVirtPkg/Library/ArmVirtualizationPsciResetSystemLib
6 So similar issues might exist in this implementation too.
7
8 Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
9 Copyright (c) 2013-2015, 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
29 #include <IndustryStandard/ArmStdSmc.h>
30
31 /**
32 Resets the entire platform.
33
34 @param ResetType The type of reset to perform.
35 @param ResetStatus The status code for the reset.
36 @param DataSize The size, in bytes, of WatchdogData.
37 @param ResetData For a ResetType of EfiResetCold, EfiResetWarm, or
38 EfiResetShutdown the data buffer starts with a Null-terminated
39 Unicode string, optionally followed by additional binary data.
40
41 **/
42 EFI_STATUS
43 EFIAPI
LibResetSystem(IN EFI_RESET_TYPE ResetType,IN EFI_STATUS ResetStatus,IN UINTN DataSize,IN CHAR16 * ResetData OPTIONAL)44 LibResetSystem (
45 IN EFI_RESET_TYPE ResetType,
46 IN EFI_STATUS ResetStatus,
47 IN UINTN DataSize,
48 IN CHAR16 *ResetData OPTIONAL
49 )
50 {
51 ARM_SMC_ARGS ArmSmcArgs;
52
53 switch (ResetType) {
54 case EfiResetPlatformSpecific:
55 // Map the platform specific reset as reboot
56 case EfiResetWarm:
57 // Map a warm reset into a cold reset
58 case EfiResetCold:
59 // Send a PSCI 0.2 SYSTEM_RESET command
60 ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
61 break;
62 case EfiResetShutdown:
63 // Send a PSCI 0.2 SYSTEM_OFF command
64 ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
65 break;
66 default:
67 ASSERT (FALSE);
68 return EFI_UNSUPPORTED;
69 }
70
71 ArmCallSmc (&ArmSmcArgs);
72
73 // We should never be here
74 DEBUG ((EFI_D_ERROR, "%a: PSCI Reset failed\n", __FUNCTION__));
75 CpuDeadLoop ();
76 return EFI_UNSUPPORTED;
77 }
78
79 /**
80 Initialize any infrastructure required for LibResetSystem () to function.
81
82 @param ImageHandle The firmware allocated handle for the EFI image.
83 @param SystemTable A pointer to the EFI System Table.
84
85 @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
86
87 **/
88 EFI_STATUS
89 EFIAPI
LibInitializeResetSystem(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE * SystemTable)90 LibInitializeResetSystem (
91 IN EFI_HANDLE ImageHandle,
92 IN EFI_SYSTEM_TABLE *SystemTable
93 )
94 {
95 return EFI_SUCCESS;
96 }
97