1 /** @file
2 Reset System Library functions for bootloader
3
4 Copyright (c) 2014 - 2019, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
6
7 **/
8
9 #include <PiDxe.h>
10 #include <Library/BaseLib.h>
11 #include <Library/DebugLib.h>
12 #include <Library/IoLib.h>
13 #include <Library/HobLib.h>
14 #include <Library/BaseMemoryLib.h>
15 #include <Guid/AcpiBoardInfoGuid.h>
16
17 ACPI_BOARD_INFO mAcpiBoardInfo;
18
19 /**
20 The constructor function to initialize mAcpiBoardInfo.
21
22 @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
23
24 **/
25 RETURN_STATUS
26 EFIAPI
ResetSystemLibConstructor(VOID)27 ResetSystemLibConstructor (
28 VOID
29 )
30 {
31 EFI_HOB_GUID_TYPE *GuidHob;
32 ACPI_BOARD_INFO *AcpiBoardInfoPtr;
33
34 //
35 // Find the acpi board information guid hob
36 //
37 GuidHob = GetFirstGuidHob (&gUefiAcpiBoardInfoGuid);
38 ASSERT (GuidHob != NULL);
39
40 AcpiBoardInfoPtr = (ACPI_BOARD_INFO *)GET_GUID_HOB_DATA (GuidHob);
41 CopyMem (&mAcpiBoardInfo, AcpiBoardInfoPtr, sizeof (ACPI_BOARD_INFO));
42
43 return EFI_SUCCESS;
44 }
45
46
47 VOID
AcpiPmControl(UINTN SuspendType)48 AcpiPmControl (
49 UINTN SuspendType
50 )
51 {
52 UINTN PmCtrlReg;
53
54 ASSERT (SuspendType <= 7);
55
56 PmCtrlReg = (UINTN)mAcpiBoardInfo.PmCtrlRegBase;
57 IoAndThenOr16 (PmCtrlReg, (UINT16) ~0x3c00, (UINT16) (SuspendType << 10));
58 IoOr16 (PmCtrlReg, BIT13);
59 CpuDeadLoop ();
60 }
61
62 /**
63 Calling this function causes a system-wide reset. This sets
64 all circuitry within the system to its initial state. This type of reset
65 is asynchronous to system operation and operates without regard to
66 cycle boundaries.
67
68 System reset should not return, if it returns, it means the system does
69 not support cold reset.
70 **/
71 VOID
72 EFIAPI
ResetCold(VOID)73 ResetCold (
74 VOID
75 )
76 {
77 IoWrite8 ((UINTN)mAcpiBoardInfo.ResetRegAddress, mAcpiBoardInfo.ResetValue);
78 CpuDeadLoop ();
79 }
80
81 /**
82 Calling this function causes a system-wide initialization. The processors
83 are set to their initial state, and pending cycles are not corrupted.
84
85 System reset should not return, if it returns, it means the system does
86 not support warm reset.
87 **/
88 VOID
89 EFIAPI
ResetWarm(VOID)90 ResetWarm (
91 VOID
92 )
93 {
94 IoWrite8 ((UINTN)mAcpiBoardInfo.ResetRegAddress, mAcpiBoardInfo.ResetValue);
95 CpuDeadLoop ();
96 }
97
98 /**
99 Calling this function causes the system to enter a power state equivalent
100 to the ACPI G2/S5 or G3 states.
101
102 System shutdown should not return, if it returns, it means the system does
103 not support shut down reset.
104 **/
105 VOID
106 EFIAPI
ResetShutdown(VOID)107 ResetShutdown (
108 VOID
109 )
110 {
111 UINTN PmCtrlReg;
112
113 //
114 // GPE0_EN should be disabled to avoid any GPI waking up the system from S5
115 //
116 IoWrite16 ((UINTN)mAcpiBoardInfo.PmGpeEnBase, 0);
117
118 //
119 // Clear Power Button Status
120 //
121 IoWrite16((UINTN) mAcpiBoardInfo.PmEvtBase, BIT8);
122
123 //
124 // Transform system into S5 sleep state
125 //
126 PmCtrlReg = (UINTN)mAcpiBoardInfo.PmCtrlRegBase;
127 IoAndThenOr16 (PmCtrlReg, (UINT16) ~0x3c00, (UINT16) (7 << 10));
128 IoOr16 (PmCtrlReg, BIT13);
129 CpuDeadLoop ();
130
131 ASSERT (FALSE);
132 }
133
134 /**
135 Calling this function causes the system to enter a power state for capsule
136 update.
137
138 Reset update should not return, if it returns, it means the system does
139 not support capsule update.
140
141 **/
142 VOID
143 EFIAPI
EnterS3WithImmediateWake(VOID)144 EnterS3WithImmediateWake (
145 VOID
146 )
147 {
148 AcpiPmControl (5);
149 ASSERT (FALSE);
150 }
151
152 /**
153 This function causes a systemwide reset. The exact type of the reset is
154 defined by the EFI_GUID that follows the Null-terminated Unicode string passed
155 into ResetData. If the platform does not recognize the EFI_GUID in ResetData
156 the platform must pick a supported reset type to perform.The platform may
157 optionally log the parameters from any non-normal reset that occurs.
158
159 @param[in] DataSize The size, in bytes, of ResetData.
160 @param[in] ResetData The data buffer starts with a Null-terminated string,
161 followed by the EFI_GUID.
162 **/
163 VOID
164 EFIAPI
ResetPlatformSpecific(IN UINTN DataSize,IN VOID * ResetData)165 ResetPlatformSpecific (
166 IN UINTN DataSize,
167 IN VOID *ResetData
168 )
169 {
170 ResetCold ();
171 }
172