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a33a2f62 JY |
1 | /** @file\r |
2 | Sample to provide SecTemporaryRamSupport function.\r | |
3 | \r | |
4 | Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <PiPei.h>\r | |
16 | \r | |
17 | #include <Ppi/TemporaryRamSupport.h>\r | |
18 | \r | |
19 | #include <Library/BaseMemoryLib.h>\r | |
20 | #include <Library/DebugLib.h>\r | |
21 | #include <Library/PcdLib.h>\r | |
22 | #include <Library/DebugAgentLib.h>\r | |
23 | \r | |
24 | /**\r | |
25 | Switch the stack in the temporary memory to the one in the permanent memory.\r | |
26 | \r | |
27 | This function must be invoked after the memory migration immediately. The relative\r | |
28 | position of the stack in the temporary and permanent memory is same.\r | |
29 | \r | |
30 | @param[in] TemporaryMemoryBase Base address of the temporary memory.\r | |
31 | @param[in] PermenentMemoryBase Base address of the permanent memory.\r | |
32 | **/\r | |
33 | VOID\r | |
34 | EFIAPI\r | |
35 | SecSwitchStack (\r | |
36 | IN UINT32 TemporaryMemoryBase,\r | |
37 | IN UINT32 PermenentMemoryBase\r | |
38 | );\r | |
39 | \r | |
40 | /**\r | |
41 | This service of the TEMPORARY_RAM_SUPPORT_PPI that migrates temporary RAM into\r | |
42 | permanent memory.\r | |
43 | \r | |
44 | @param[in] PeiServices Pointer to the PEI Services Table.\r | |
45 | @param[in] TemporaryMemoryBase Source Address in temporary memory from which the SEC or PEIM will copy the\r | |
46 | Temporary RAM contents.\r | |
47 | @param[in] PermanentMemoryBase Destination Address in permanent memory into which the SEC or PEIM will copy the\r | |
48 | Temporary RAM contents.\r | |
49 | @param[in] CopySize Amount of memory to migrate from temporary to permanent memory.\r | |
50 | \r | |
51 | @retval EFI_SUCCESS The data was successfully returned.\r | |
52 | @retval EFI_INVALID_PARAMETER PermanentMemoryBase + CopySize > TemporaryMemoryBase when\r | |
53 | TemporaryMemoryBase > PermanentMemoryBase.\r | |
54 | \r | |
55 | **/\r | |
56 | EFI_STATUS\r | |
57 | EFIAPI\r | |
58 | SecTemporaryRamSupport (\r | |
59 | IN CONST EFI_PEI_SERVICES **PeiServices,\r | |
60 | IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase,\r | |
61 | IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase,\r | |
62 | IN UINTN CopySize\r | |
63 | )\r | |
64 | {\r | |
65 | IA32_DESCRIPTOR IdtDescriptor;\r | |
66 | VOID* OldHeap;\r | |
67 | VOID* NewHeap;\r | |
68 | VOID* OldStack;\r | |
69 | VOID* NewStack;\r | |
70 | DEBUG_AGENT_CONTEXT_POSTMEM_SEC DebugAgentContext;\r | |
71 | BOOLEAN OldStatus;\r | |
72 | UINTN PeiStackSize;\r | |
73 | \r | |
74 | PeiStackSize = (UINTN)PcdGet32 (PcdPeiTemporaryRamStackSize);\r | |
75 | if (PeiStackSize == 0) {\r | |
76 | PeiStackSize = (CopySize >> 1);\r | |
77 | }\r | |
78 | \r | |
79 | ASSERT (PeiStackSize < CopySize);\r | |
80 | \r | |
81 | //\r | |
82 | // |-------------------|---->\r | |
83 | // | Stack | PeiStackSize\r | |
84 | // |-------------------|---->\r | |
85 | // | Heap | PeiTemporayRamSize\r | |
86 | // |-------------------|----> TempRamBase\r | |
87 | //\r | |
88 | // |-------------------|---->\r | |
89 | // | Heap | PeiTemporayRamSize\r | |
90 | // |-------------------|---->\r | |
91 | // | Stack | PeiStackSize\r | |
92 | // |-------------------|----> PermanentMemoryBase\r | |
93 | //\r | |
94 | \r | |
95 | OldHeap = (VOID*)(UINTN)TemporaryMemoryBase;\r | |
96 | NewHeap = (VOID*)((UINTN)PermanentMemoryBase + PeiStackSize);\r | |
97 | \r | |
98 | OldStack = (VOID*)((UINTN)TemporaryMemoryBase + CopySize - PeiStackSize);\r | |
99 | NewStack = (VOID*)(UINTN)PermanentMemoryBase;\r | |
100 | \r | |
101 | DebugAgentContext.HeapMigrateOffset = (UINTN)NewHeap - (UINTN)OldHeap;\r | |
102 | DebugAgentContext.StackMigrateOffset = (UINTN)NewStack - (UINTN)OldStack;\r | |
103 | \r | |
104 | OldStatus = SaveAndSetDebugTimerInterrupt (FALSE);\r | |
105 | //\r | |
106 | // Initialize Debug Agent to support source level debug in PEI phase after memory ready.\r | |
107 | // It will build HOB and fix up the pointer in IDT table.\r | |
108 | //\r | |
109 | InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, (VOID *) &DebugAgentContext, NULL);\r | |
110 | \r | |
111 | //\r | |
112 | // Migrate Heap\r | |
113 | //\r | |
114 | CopyMem (NewHeap, OldHeap, CopySize - PeiStackSize);\r | |
115 | \r | |
116 | //\r | |
117 | // Migrate Stack\r | |
118 | //\r | |
119 | CopyMem (NewStack, OldStack, PeiStackSize);\r | |
120 | \r | |
121 | \r | |
122 | //\r | |
123 | // We need *not* fix the return address because currently,\r | |
124 | // The PeiCore is executed in flash.\r | |
125 | //\r | |
126 | \r | |
127 | //\r | |
128 | // Rebase IDT table in permanent memory\r | |
129 | //\r | |
130 | AsmReadIdtr (&IdtDescriptor);\r | |
131 | IdtDescriptor.Base = IdtDescriptor.Base - (UINTN)OldStack + (UINTN)NewStack;\r | |
132 | \r | |
133 | AsmWriteIdtr (&IdtDescriptor);\r | |
134 | \r | |
135 | \r | |
136 | //\r | |
137 | // Program MTRR\r | |
138 | //\r | |
139 | \r | |
140 | //\r | |
141 | // SecSwitchStack function must be invoked after the memory migration\r | |
b9ca25cb GL |
142 | // immediately, also we need fixup the stack change caused by new call into\r |
143 | // permanent memory.\r | |
a33a2f62 JY |
144 | //\r |
145 | SecSwitchStack (\r | |
146 | (UINT32) (UINTN) OldStack,\r | |
147 | (UINT32) (UINTN) NewStack\r | |
148 | );\r | |
149 | \r | |
150 | SaveAndSetDebugTimerInterrupt (OldStatus);\r | |
151 | \r | |
152 | return EFI_SUCCESS;\r | |
153 | }\r | |
154 | \r |