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1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2009, Hewlett-Packard Company. All rights reserved.<BR>\r | |
4 | Portions copyright (c) 2010, Apple Inc. All rights reserved.<BR>\r | |
5 | Portions copyright (c) 2011-2013, ARM Ltd. All rights reserved.<BR>\r | |
6 | \r | |
7 | This program and the accompanying materials\r | |
8 | are licensed and made available under the terms and conditions of the BSD License\r | |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
15 | \r | |
16 | --*/\r | |
17 | \r | |
18 | #include "CpuDxe.h"\r | |
19 | \r | |
20 | #define TT_ATTR_INDX_INVALID ((UINT32)~0)\r | |
21 | \r | |
22 | STATIC\r | |
23 | UINT64\r | |
24 | GetFirstPageAttribute (\r | |
25 | IN UINT64 *FirstLevelTableAddress,\r | |
26 | IN UINTN TableLevel\r | |
27 | )\r | |
28 | {\r | |
29 | UINT64 FirstEntry;\r | |
30 | \r | |
31 | // Get the first entry of the table\r | |
32 | FirstEntry = *FirstLevelTableAddress;\r | |
33 | \r | |
34 | if ((FirstEntry & TT_TYPE_MASK) == TT_TYPE_TABLE_ENTRY) {\r | |
35 | // Only valid for Levels 0, 1 and 2\r | |
36 | ASSERT (TableLevel < 3);\r | |
37 | \r | |
38 | // Get the attribute of the subsequent table\r | |
39 | return GetFirstPageAttribute ((UINT64*)(FirstEntry & TT_ADDRESS_MASK_DESCRIPTION_TABLE), TableLevel + 1);\r | |
40 | } else if (((FirstEntry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY) ||\r | |
41 | ((TableLevel == 3) && ((FirstEntry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY_LEVEL3)))\r | |
42 | {\r | |
43 | return FirstEntry & TT_ATTR_INDX_MASK;\r | |
44 | } else {\r | |
45 | return TT_ATTR_INDX_INVALID;\r | |
46 | }\r | |
47 | }\r | |
48 | \r | |
49 | STATIC\r | |
50 | UINT64\r | |
51 | GetNextEntryAttribute (\r | |
52 | IN UINT64 *TableAddress,\r | |
53 | IN UINTN EntryCount,\r | |
54 | IN UINTN TableLevel,\r | |
55 | IN UINT64 BaseAddress,\r | |
56 | IN OUT UINT32 *PrevEntryAttribute,\r | |
57 | IN OUT UINT64 *StartGcdRegion\r | |
58 | )\r | |
59 | {\r | |
60 | UINTN Index;\r | |
61 | UINT64 Entry;\r | |
62 | UINT32 EntryAttribute;\r | |
63 | UINT32 EntryType;\r | |
64 | EFI_STATUS Status;\r | |
65 | UINTN NumberOfDescriptors;\r | |
66 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;\r | |
67 | \r | |
68 | // Get the memory space map from GCD\r | |
69 | MemorySpaceMap = NULL;\r | |
70 | Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);\r | |
71 | ASSERT_EFI_ERROR (Status);\r | |
72 | \r | |
73 | // We cannot get more than 3-level page table\r | |
74 | ASSERT (TableLevel <= 3);\r | |
75 | \r | |
76 | // While the top level table might not contain TT_ENTRY_COUNT entries;\r | |
77 | // the subsequent ones should be filled up\r | |
78 | for (Index = 0; Index < EntryCount; Index++) {\r | |
79 | Entry = TableAddress[Index];\r | |
80 | EntryType = Entry & TT_TYPE_MASK;\r | |
81 | EntryAttribute = Entry & TT_ATTR_INDX_MASK;\r | |
82 | \r | |
83 | // If Entry is a Table Descriptor type entry then go through the sub-level table\r | |
84 | if ((EntryType == TT_TYPE_BLOCK_ENTRY) ||\r | |
85 | ((TableLevel == 3) && (EntryType == TT_TYPE_BLOCK_ENTRY_LEVEL3))) {\r | |
86 | if ((*PrevEntryAttribute == TT_ATTR_INDX_INVALID) || (EntryAttribute != *PrevEntryAttribute)) {\r | |
87 | if (*PrevEntryAttribute != TT_ATTR_INDX_INVALID) {\r | |
88 | // Update GCD with the last region\r | |
89 | SetGcdMemorySpaceAttributes (MemorySpaceMap, NumberOfDescriptors,\r | |
90 | *StartGcdRegion,\r | |
91 | (BaseAddress + (Index * TT_ADDRESS_AT_LEVEL(TableLevel)) - 1) - *StartGcdRegion,\r | |
92 | PageAttributeToGcdAttribute (EntryAttribute));\r | |
93 | }\r | |
94 | \r | |
95 | // Start of the new region\r | |
96 | *StartGcdRegion = BaseAddress + (Index * TT_ADDRESS_AT_LEVEL(TableLevel));\r | |
97 | *PrevEntryAttribute = EntryAttribute;\r | |
98 | } else {\r | |
99 | continue;\r | |
100 | }\r | |
101 | } else if (EntryType == TT_TYPE_TABLE_ENTRY) {\r | |
102 | // Table Entry type is only valid for Level 0, 1, 2\r | |
103 | ASSERT (TableLevel < 3);\r | |
104 | \r | |
105 | // Increase the level number and scan the sub-level table\r | |
106 | GetNextEntryAttribute ((UINT64*)(Entry & TT_ADDRESS_MASK_DESCRIPTION_TABLE),\r | |
107 | TT_ENTRY_COUNT, TableLevel + 1,\r | |
108 | (BaseAddress + (Index * TT_ADDRESS_AT_LEVEL(TableLevel))),\r | |
109 | PrevEntryAttribute, StartGcdRegion);\r | |
110 | } else {\r | |
111 | if (*PrevEntryAttribute != TT_ATTR_INDX_INVALID) {\r | |
112 | // Update GCD with the last region\r | |
113 | SetGcdMemorySpaceAttributes (MemorySpaceMap, NumberOfDescriptors,\r | |
114 | *StartGcdRegion,\r | |
115 | (BaseAddress + (Index * TT_ADDRESS_AT_LEVEL(TableLevel)) - 1) - *StartGcdRegion,\r | |
116 | PageAttributeToGcdAttribute (EntryAttribute));\r | |
117 | \r | |
118 | // Start of the new region\r | |
119 | *StartGcdRegion = BaseAddress + (Index * TT_ADDRESS_AT_LEVEL(TableLevel));\r | |
120 | *PrevEntryAttribute = TT_ATTR_INDX_INVALID;\r | |
121 | }\r | |
122 | }\r | |
123 | }\r | |
124 | \r | |
125 | return BaseAddress + (EntryCount * TT_ADDRESS_AT_LEVEL(TableLevel));\r | |
126 | }\r | |
127 | \r | |
128 | EFI_STATUS\r | |
129 | SyncCacheConfig (\r | |
130 | IN EFI_CPU_ARCH_PROTOCOL *CpuProtocol\r | |
131 | )\r | |
132 | {\r | |
133 | EFI_STATUS Status;\r | |
134 | UINT32 PageAttribute = 0;\r | |
135 | UINT64 *FirstLevelTableAddress;\r | |
136 | UINTN TableLevel;\r | |
137 | UINTN TableCount;\r | |
138 | UINTN NumberOfDescriptors;\r | |
139 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;\r | |
140 | UINTN Tcr;\r | |
141 | UINTN T0SZ;\r | |
142 | UINT64 BaseAddressGcdRegion;\r | |
143 | UINT64 EndAddressGcdRegion;\r | |
144 | \r | |
145 | // This code assumes MMU is enabled and filed with section translations\r | |
146 | ASSERT (ArmMmuEnabled ());\r | |
147 | \r | |
148 | //\r | |
149 | // Get the memory space map from GCD\r | |
150 | //\r | |
151 | MemorySpaceMap = NULL;\r | |
152 | Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);\r | |
153 | ASSERT_EFI_ERROR (Status);\r | |
154 | \r | |
155 | // The GCD implementation maintains its own copy of the state of memory space attributes. GCD needs\r | |
156 | // to know what the initial memory space attributes are. The CPU Arch. Protocol does not provide a\r | |
157 | // GetMemoryAttributes function for GCD to get this so we must resort to calling GCD (as if we were\r | |
158 | // a client) to update its copy of the attributes. This is bad architecture and should be replaced\r | |
159 | // with a way for GCD to query the CPU Arch. driver of the existing memory space attributes instead.\r | |
160 | \r | |
161 | // Obtain page table base\r | |
162 | FirstLevelTableAddress = (UINT64*)(ArmGetTTBR0BaseAddress ());\r | |
163 | \r | |
164 | // Get Translation Control Register value\r | |
165 | Tcr = ArmGetTCR ();\r | |
166 | // Get Address Region Size\r | |
167 | T0SZ = Tcr & TCR_T0SZ_MASK;\r | |
168 | \r | |
169 | // Get the level of the first table for the indicated Address Region Size\r | |
170 | GetRootTranslationTableInfo (T0SZ, &TableLevel, &TableCount);\r | |
171 | \r | |
172 | // First Attribute of the Page Tables\r | |
173 | PageAttribute = GetFirstPageAttribute (FirstLevelTableAddress, TableLevel);\r | |
174 | \r | |
175 | // We scan from the start of the memory map (ie: at the address 0x0)\r | |
176 | BaseAddressGcdRegion = 0x0;\r | |
177 | EndAddressGcdRegion = GetNextEntryAttribute (FirstLevelTableAddress,\r | |
178 | TableCount, TableLevel,\r | |
179 | BaseAddressGcdRegion,\r | |
180 | &PageAttribute, &BaseAddressGcdRegion);\r | |
181 | \r | |
182 | // Update GCD with the last region\r | |
183 | SetGcdMemorySpaceAttributes (MemorySpaceMap, NumberOfDescriptors,\r | |
184 | BaseAddressGcdRegion,\r | |
185 | EndAddressGcdRegion - BaseAddressGcdRegion,\r | |
186 | PageAttributeToGcdAttribute (PageAttribute));\r | |
187 | \r | |
188 | return EFI_SUCCESS;\r | |
189 | }\r |