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1 | /** @file\r | |
2 | Implementation of the 6 PEI Ffs (FV) APIs in library form.\r | |
3 | \r | |
4 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
5 | \r | |
6 | This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <PiPei.h>\r | |
17 | \r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/BaseMemoryLib.h>\r | |
20 | #include <Library/PrePiLib.h>\r | |
21 | #include <Library/DebugLib.h>\r | |
22 | \r | |
23 | \r | |
24 | \r | |
25 | /**\r | |
26 | Allocates one or more 4KB pages of type EfiBootServicesData.\r | |
27 | \r | |
28 | Allocates the number of 4KB pages of MemoryType and returns a pointer to the\r | |
29 | allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL\r | |
30 | is returned. If there is not enough memory remaining to satisfy the request, then NULL is\r | |
31 | returned.\r | |
32 | \r | |
33 | @param Pages The number of 4 KB pages to allocate.\r | |
34 | \r | |
35 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
36 | \r | |
37 | **/\r | |
38 | VOID *\r | |
39 | EFIAPI\r | |
40 | AllocatePages (\r | |
41 | IN UINTN Pages\r | |
42 | )\r | |
43 | {\r | |
44 | EFI_PEI_HOB_POINTERS Hob;\r | |
45 | EFI_PHYSICAL_ADDRESS Offset;\r | |
46 | \r | |
47 | Hob.Raw = GetHobList ();\r | |
48 | \r | |
49 | // Check to see if on 4k boundary\r | |
50 | Offset = Hob.HandoffInformationTable->EfiFreeMemoryTop & 0xFFF;\r | |
51 | if (Offset != 0) {\r | |
52 | // If not aligned, make the allocation aligned.\r | |
53 | Hob.HandoffInformationTable->EfiFreeMemoryTop -= Offset;\r | |
54 | }\r | |
55 | \r | |
56 | //\r | |
57 | // Verify that there is sufficient memory to satisfy the allocation\r | |
58 | //\r | |
59 | if (Hob.HandoffInformationTable->EfiFreeMemoryTop - ((Pages * EFI_PAGE_SIZE) + sizeof (EFI_HOB_MEMORY_ALLOCATION)) < Hob.HandoffInformationTable->EfiFreeMemoryBottom) {\r | |
60 | return 0;\r | |
61 | } else {\r | |
62 | //\r | |
63 | // Update the PHIT to reflect the memory usage\r | |
64 | //\r | |
65 | Hob.HandoffInformationTable->EfiFreeMemoryTop -= Pages * EFI_PAGE_SIZE;\r | |
66 | \r | |
67 | // This routine used to create a memory allocation HOB a la PEI, but that's not\r | |
68 | // necessary for us.\r | |
69 | \r | |
70 | //\r | |
71 | // Create a memory allocation HOB.\r | |
72 | //\r | |
73 | BuildMemoryAllocationHob (\r | |
74 | Hob.HandoffInformationTable->EfiFreeMemoryTop,\r | |
75 | Pages * EFI_PAGE_SIZE,\r | |
76 | EfiBootServicesData\r | |
77 | );\r | |
78 | return (VOID *)(UINTN)Hob.HandoffInformationTable->EfiFreeMemoryTop;\r | |
79 | }\r | |
80 | }\r | |
81 | \r | |
82 | \r | |
83 | /**\r | |
84 | Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.\r | |
85 | \r | |
86 | Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an\r | |
87 | alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is\r | |
88 | returned. If there is not enough memory at the specified alignment remaining to satisfy the\r | |
89 | request, then NULL is returned.\r | |
90 | If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r | |
91 | \r | |
92 | @param Pages The number of 4 KB pages to allocate.\r | |
93 | @param Alignment The requested alignment of the allocation. Must be a power of two.\r | |
94 | If Alignment is zero, then byte alignment is used.\r | |
95 | \r | |
96 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
97 | \r | |
98 | **/\r | |
99 | VOID *\r | |
100 | EFIAPI\r | |
101 | AllocateAlignedPages (\r | |
102 | IN UINTN Pages,\r | |
103 | IN UINTN Alignment\r | |
104 | )\r | |
105 | {\r | |
106 | VOID *Memory;\r | |
107 | UINTN AlignmentMask;\r | |
108 | \r | |
109 | //\r | |
110 | // Alignment must be a power of two or zero.\r | |
111 | //\r | |
112 | ASSERT ((Alignment & (Alignment - 1)) == 0);\r | |
113 | \r | |
114 | if (Pages == 0) {\r | |
115 | return NULL;\r | |
116 | }\r | |
117 | //\r | |
118 | // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.\r | |
119 | //\r | |
120 | ASSERT (Pages <= (MAX_ADDRESS - EFI_SIZE_TO_PAGES (Alignment)));\r | |
121 | //\r | |
122 | // We would rather waste some memory to save PEI code size.\r | |
123 | //\r | |
124 | Memory = (VOID *)(UINTN)AllocatePages (Pages + EFI_SIZE_TO_PAGES (Alignment));\r | |
125 | if (Alignment == 0) {\r | |
126 | AlignmentMask = Alignment;\r | |
127 | } else {\r | |
128 | AlignmentMask = Alignment - 1;\r | |
129 | }\r | |
130 | return (VOID *) (UINTN) (((UINTN) Memory + AlignmentMask) & ~AlignmentMask);\r | |
131 | }\r | |
132 | \r | |
133 | \r | |
134 | /**\r | |
135 | Frees one or more 4KB pages that were previously allocated with one of the page allocation\r | |
136 | functions in the Memory Allocation Library.\r | |
137 | \r | |
138 | Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer\r | |
139 | must have been allocated on a previous call to the page allocation services of the Memory\r | |
140 | Allocation Library. If it is not possible to free allocated pages, then this function will\r | |
141 | perform no actions.\r | |
142 | \r | |
143 | If Buffer was not allocated with a page allocation function in the Memory Allocation Library,\r | |
144 | then ASSERT().\r | |
145 | If Pages is zero, then ASSERT().\r | |
146 | \r | |
147 | @param Buffer Pointer to the buffer of pages to free.\r | |
148 | @param Pages The number of 4 KB pages to free.\r | |
149 | \r | |
150 | **/\r | |
151 | VOID\r | |
152 | EFIAPI\r | |
153 | FreePages (\r | |
154 | IN VOID *Buffer,\r | |
155 | IN UINTN Pages\r | |
156 | )\r | |
157 | {\r | |
158 | // For now, we do not support the ability to free pages in the PrePei Memory Allocator.\r | |
159 | // The allocated memory is lost.\r | |
160 | }\r | |
161 | \r | |
162 | /**\r | |
163 | Allocates a buffer of type EfiBootServicesData.\r | |
164 | \r | |
165 | Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a\r | |
166 | pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is\r | |
167 | returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.\r | |
168 | \r | |
169 | @param AllocationSize The number of bytes to allocate.\r | |
170 | \r | |
171 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
172 | \r | |
173 | **/\r | |
174 | VOID *\r | |
175 | EFIAPI\r | |
176 | AllocatePool (\r | |
177 | IN UINTN AllocationSize\r | |
178 | )\r | |
179 | {\r | |
180 | EFI_HOB_MEMORY_POOL *Hob;\r | |
181 | \r | |
182 | Hob = GetHobList ();\r | |
183 | \r | |
184 | \r | |
185 | //\r | |
186 | // Verify that there is sufficient memory to satisfy the allocation\r | |
187 | //\r | |
188 | if (AllocationSize > 0x10000) {\r | |
189 | // Please call AllcoatePages for big allocations\r | |
190 | return 0;\r | |
191 | } else {\r | |
192 | \r | |
193 | Hob = (EFI_HOB_MEMORY_POOL *)CreateHob (EFI_HOB_TYPE_MEMORY_POOL, (UINT16)(sizeof (EFI_HOB_TYPE_MEMORY_POOL) + AllocationSize));\r | |
194 | return (VOID *)(Hob + 1);\r | |
195 | }\r | |
196 | }\r | |
197 | \r | |
198 | /**\r | |
199 | Allocates and zeros a buffer of type EfiBootServicesData.\r | |
200 | \r | |
201 | Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the\r | |
202 | buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a\r | |
203 | valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the\r | |
204 | request, then NULL is returned.\r | |
205 | \r | |
206 | @param AllocationSize The number of bytes to allocate and zero.\r | |
207 | \r | |
208 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
209 | \r | |
210 | **/\r | |
211 | VOID *\r | |
212 | EFIAPI\r | |
213 | AllocateZeroPool (\r | |
214 | IN UINTN AllocationSize\r | |
215 | )\r | |
216 | {\r | |
217 | VOID *Buffer;\r | |
218 | \r | |
219 | Buffer = AllocatePool (AllocationSize);\r | |
220 | if (Buffer == NULL) {\r | |
221 | return NULL;\r | |
222 | }\r | |
223 | \r | |
224 | ZeroMem (Buffer, AllocationSize);\r | |
225 | \r | |
226 | return Buffer;\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | Frees a buffer that was previously allocated with one of the pool allocation functions in the\r | |
231 | Memory Allocation Library.\r | |
232 | \r | |
233 | Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the\r | |
234 | pool allocation services of the Memory Allocation Library. If it is not possible to free pool\r | |
235 | resources, then this function will perform no actions.\r | |
236 | \r | |
237 | If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,\r | |
238 | then ASSERT().\r | |
239 | \r | |
240 | @param Buffer Pointer to the buffer to free.\r | |
241 | \r | |
242 | **/\r | |
243 | VOID\r | |
244 | EFIAPI\r | |
245 | FreePool (\r | |
246 | IN VOID *Buffer\r | |
247 | )\r | |
248 | {\r | |
249 | // Not implemented yet\r | |
250 | }\r |