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1 | /** @file\r |
2 | This is the driver that publishes the SMM Access Protocol\r | |
3 | instance for the Tylersburg chipset.\r | |
4 | \r | |
5 | Copyright (c) 2013-2015 Intel Corporation.\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 | #include "SmmAccessDriver.h"\r | |
18 | \r | |
19 | \r | |
20 | \r | |
21 | SMM_ACCESS_PRIVATE_DATA mSmmAccess;\r | |
22 | \r | |
23 | VOID\r | |
24 | SmmAccessOnBoot (\r | |
25 | IN EFI_EVENT Event,\r | |
26 | IN VOID *Context\r | |
27 | );\r | |
28 | \r | |
29 | EFI_STATUS\r | |
30 | EFIAPI\r | |
31 | SmmAccessDriverEntryPoint (\r | |
32 | IN EFI_HANDLE ImageHandle,\r | |
33 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
34 | )\r | |
35 | /*++\r | |
36 | \r | |
37 | Routine Description:\r | |
38 | \r | |
39 | Installs an SMM Access Protocol.\r | |
40 | \r | |
41 | Arguments:\r | |
42 | \r | |
43 | ImageHandle - Handle for the image of this driver.\r | |
44 | SystemTable - Pointer to the EFI System Table.\r | |
45 | \r | |
46 | Returns:\r | |
47 | \r | |
48 | EFI_SUCCESS - Protocol successfully started and installed.\r | |
49 | EFI_UNSUPPORTED - Protocol can't be started.\r | |
50 | EFI_NOT_FOUND - Protocol not found.\r | |
51 | --*/\r | |
52 | {\r | |
53 | \r | |
54 | EFI_STATUS Status;\r | |
55 | EFI_EVENT BootEvent;\r | |
56 | EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r | |
57 | UINTN Index;\r | |
58 | EFI_SMRAM_HOB_DESCRIPTOR_BLOCK *DescriptorBlock;\r | |
59 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
60 | \r | |
61 | \r | |
62 | //\r | |
63 | // Initialize private data\r | |
64 | //\r | |
65 | ZeroMem (&mSmmAccess, sizeof (mSmmAccess));\r | |
66 | \r | |
67 | Status = gBS->LocateProtocol (\r | |
68 | &gEfiPciRootBridgeIoProtocolGuid,\r | |
69 | NULL,\r | |
70 | (VOID **) &PciRootBridgeIo\r | |
71 | );\r | |
72 | ASSERT_EFI_ERROR (Status);\r | |
73 | \r | |
74 | //\r | |
75 | // Build SMM related information\r | |
76 | //\r | |
77 | mSmmAccess.Signature = SMM_ACCESS_PRIVATE_DATA_SIGNATURE;\r | |
78 | mSmmAccess.Handle = NULL;\r | |
79 | mSmmAccess.PciRootBridgeIo = PciRootBridgeIo;\r | |
80 | \r | |
81 | //\r | |
82 | // Get Hob list\r | |
83 | //\r | |
84 | GuidHob = GetFirstGuidHob (&gEfiSmmPeiSmramMemoryReserveGuid);\r | |
85 | DescriptorBlock = GET_GUID_HOB_DATA (GuidHob);\r | |
86 | ASSERT (DescriptorBlock);\r | |
87 | \r | |
88 | \r | |
89 | //\r | |
90 | // Get CPU Max bus number\r | |
91 | //\r | |
92 | mSmmAccess.MaxBusNumber = PCI_BUS_NUMBER_QNC;\r | |
93 | for (Index = 0; Index < MAX_CPU_SOCKET; Index++) {\r | |
94 | mSmmAccess.SocketPopulated[Index] = TRUE;\r | |
95 | }\r | |
96 | \r | |
97 | //\r | |
98 | // Use the hob to publish SMRAM capabilities\r | |
99 | //\r | |
100 | ASSERT (DescriptorBlock->NumberOfSmmReservedRegions <= MAX_SMRAM_RANGES);\r | |
101 | for (Index = 0; Index < DescriptorBlock->NumberOfSmmReservedRegions; Index++) {\r | |
102 | mSmmAccess.SmramDesc[Index].PhysicalStart = DescriptorBlock->Descriptor[Index].PhysicalStart;\r | |
103 | mSmmAccess.SmramDesc[Index].CpuStart = DescriptorBlock->Descriptor[Index].CpuStart;\r | |
104 | mSmmAccess.SmramDesc[Index].PhysicalSize = DescriptorBlock->Descriptor[Index].PhysicalSize;\r | |
105 | mSmmAccess.SmramDesc[Index].RegionState = DescriptorBlock->Descriptor[Index].RegionState;\r | |
106 | DEBUG ((EFI_D_INFO, "SM RAM index[%d] startaddr:%08X Size :%08X\n", Index, mSmmAccess.SmramDesc[Index].CpuStart,\r | |
107 | mSmmAccess.SmramDesc[Index].PhysicalSize));\r | |
108 | }\r | |
109 | \r | |
110 | mSmmAccess.NumberRegions = Index;\r | |
111 | mSmmAccess.SmmAccess.Open = Open;\r | |
112 | mSmmAccess.SmmAccess.Close = Close;\r | |
113 | mSmmAccess.SmmAccess.Lock = Lock;\r | |
114 | mSmmAccess.SmmAccess.GetCapabilities = GetCapabilities;\r | |
115 | mSmmAccess.SmmAccess.LockState = FALSE;\r | |
116 | mSmmAccess.SmmAccess.OpenState = FALSE;\r | |
117 | mSmmAccess.SMMRegionState = EFI_SMRAM_CLOSED;\r | |
118 | \r | |
119 | //\r | |
120 | // Install our protocol interfaces on the device's handle\r | |
121 | //\r | |
122 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
123 | &mSmmAccess.Handle,\r | |
124 | &gEfiSmmAccess2ProtocolGuid,\r | |
125 | &mSmmAccess.SmmAccess,\r | |
126 | NULL\r | |
127 | );\r | |
128 | ASSERT_EFI_ERROR (Status);\r | |
129 | \r | |
130 | DEBUG ((EFI_D_INFO, "SMM Base: %08X\n", (UINT32)(mSmmAccess.SmramDesc[mSmmAccess.NumberRegions-1].PhysicalStart)));\r | |
131 | DEBUG ((EFI_D_INFO, "SMM Size: %08X\n", (UINT32)(mSmmAccess.SmramDesc[mSmmAccess.NumberRegions-1].PhysicalSize)));\r | |
132 | \r | |
133 | mSmmAccess.TsegSize = (UINT8)(mSmmAccess.SmramDesc[mSmmAccess.NumberRegions-1].PhysicalSize);\r | |
134 | //\r | |
135 | // T Seg setting done in QPI RC\r | |
136 | //\r | |
137 | \r | |
138 | //\r | |
139 | // Prior ReadyToBoot, lock CSEG\r | |
140 | //\r | |
141 | Status = EfiCreateEventReadyToBootEx(\r | |
142 | TPL_NOTIFY,\r | |
143 | SmmAccessOnBoot,\r | |
144 | NULL,\r | |
145 | &BootEvent );\r | |
146 | ASSERT (!EFI_ERROR (Status));\r | |
147 | return EFI_SUCCESS;\r | |
148 | }\r | |
149 | \r | |
150 | EFI_STATUS\r | |
151 | EFIAPI\r | |
152 | Open (\r | |
153 | IN EFI_SMM_ACCESS2_PROTOCOL *This\r | |
154 | )\r | |
155 | /*++\r | |
156 | \r | |
157 | Routine Description:\r | |
158 | \r | |
159 | This routine accepts a request to "open" a region of SMRAM. The\r | |
160 | region could be legacy ABSEG, HSEG, or TSEG near top of physical memory.\r | |
161 | The use of "open" means that the memory is visible from all boot-service\r | |
162 | and SMM agents.\r | |
163 | \r | |
164 | Arguments:\r | |
165 | \r | |
166 | This - Pointer to the SMM Access Interface.\r | |
167 | DescriptorIndex - Region of SMRAM to Open.\r | |
168 | \r | |
169 | Returns:\r | |
170 | \r | |
171 | EFI_SUCCESS - The region was successfully opened.\r | |
172 | EFI_DEVICE_ERROR - The region could not be opened because locked by\r | |
173 | chipset.\r | |
174 | EFI_INVALID_PARAMETER - The descriptor index was out of bounds.\r | |
175 | \r | |
176 | --*/\r | |
177 | {\r | |
178 | SMM_ACCESS_PRIVATE_DATA *SmmAccess;\r | |
179 | \r | |
180 | SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);\r | |
181 | \r | |
182 | if (mSmmAccess.SMMRegionState & EFI_SMRAM_LOCKED) {\r | |
183 | DEBUG ((EFI_D_ERROR, "Cannot open a locked SMRAM region\n"));\r | |
184 | return EFI_DEVICE_ERROR;\r | |
185 | }\r | |
186 | \r | |
187 | //\r | |
188 | // Open TSEG\r | |
189 | //\r | |
190 | if (!QNCOpenSmramRegion ()) {\r | |
191 | mSmmAccess.SMMRegionState |= EFI_SMRAM_LOCKED;\r | |
192 | return EFI_DEVICE_ERROR;\r | |
193 | }\r | |
194 | \r | |
195 | mSmmAccess.SMMRegionState &= ~(EFI_SMRAM_CLOSED | EFI_ALLOCATED);\r | |
196 | SyncRegionState2SmramDesc(FALSE, (UINT64)(UINTN)(~(EFI_SMRAM_CLOSED | EFI_ALLOCATED)));\r | |
197 | mSmmAccess.SMMRegionState |= EFI_SMRAM_OPEN;\r | |
198 | SyncRegionState2SmramDesc(TRUE, EFI_SMRAM_OPEN);\r | |
199 | SmmAccess->SmmAccess.OpenState = TRUE;\r | |
200 | \r | |
201 | return EFI_SUCCESS;\r | |
202 | }\r | |
203 | \r | |
204 | EFI_STATUS\r | |
205 | EFIAPI\r | |
206 | Close (\r | |
207 | IN EFI_SMM_ACCESS2_PROTOCOL *This\r | |
208 | )\r | |
209 | /*++\r | |
210 | \r | |
211 | Routine Description:\r | |
212 | \r | |
213 | This routine accepts a request to "close" a region of SMRAM. This is valid for\r | |
214 | compatible SMRAM region.\r | |
215 | \r | |
216 | Arguments:\r | |
217 | \r | |
218 | This - Pointer to the SMM Access Interface.\r | |
219 | DescriptorIndex - Region of SMRAM to Close.\r | |
220 | \r | |
221 | Returns:\r | |
222 | \r | |
223 | EFI_SUCCESS - The region was successfully closed.\r | |
224 | EFI_DEVICE_ERROR - The region could not be closed because locked by\r | |
225 | chipset.\r | |
226 | EFI_INVALID_PARAMETER - The descriptor index was out of bounds.\r | |
227 | \r | |
228 | --*/\r | |
229 | {\r | |
230 | SMM_ACCESS_PRIVATE_DATA *SmmAccess;\r | |
231 | BOOLEAN OpenState;\r | |
232 | UINTN Index;\r | |
233 | \r | |
234 | SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);\r | |
235 | \r | |
236 | if (mSmmAccess.SMMRegionState & EFI_SMRAM_LOCKED) {\r | |
237 | //\r | |
238 | // Cannot close a "locked" region\r | |
239 | //\r | |
240 | DEBUG ((EFI_D_WARN, "Cannot close the locked SMRAM Region\n"));\r | |
241 | return EFI_DEVICE_ERROR;\r | |
242 | }\r | |
243 | \r | |
244 | if (mSmmAccess.SMMRegionState & EFI_SMRAM_CLOSED) {\r | |
245 | return EFI_DEVICE_ERROR;\r | |
246 | }\r | |
247 | \r | |
248 | //\r | |
249 | // Close TSEG\r | |
250 | //\r | |
251 | if (!QNCCloseSmramRegion ()) {\r | |
252 | mSmmAccess.SMMRegionState |= EFI_SMRAM_LOCKED;\r | |
253 | return EFI_DEVICE_ERROR;\r | |
254 | }\r | |
255 | \r | |
256 | mSmmAccess.SMMRegionState &= ~EFI_SMRAM_OPEN;\r | |
257 | SyncRegionState2SmramDesc(FALSE, (UINT64)(UINTN)(~EFI_SMRAM_OPEN));\r | |
258 | mSmmAccess.SMMRegionState |= (EFI_SMRAM_CLOSED | EFI_ALLOCATED);\r | |
259 | SyncRegionState2SmramDesc(TRUE, EFI_SMRAM_CLOSED | EFI_ALLOCATED);\r | |
260 | \r | |
261 | //\r | |
262 | // Find out if any regions are still open\r | |
263 | //\r | |
264 | OpenState = FALSE;\r | |
265 | for (Index = 0; Index < mSmmAccess.NumberRegions; Index++) {\r | |
266 | if ((SmmAccess->SmramDesc[Index].RegionState & EFI_SMRAM_OPEN) == EFI_SMRAM_OPEN) {\r | |
267 | OpenState = TRUE;\r | |
268 | }\r | |
269 | }\r | |
270 | \r | |
271 | SmmAccess->SmmAccess.OpenState = OpenState;\r | |
272 | \r | |
273 | return EFI_SUCCESS;\r | |
274 | }\r | |
275 | \r | |
276 | EFI_STATUS\r | |
277 | EFIAPI\r | |
278 | Lock (\r | |
279 | IN EFI_SMM_ACCESS2_PROTOCOL *This\r | |
280 | )\r | |
281 | /*++\r | |
282 | \r | |
283 | Routine Description:\r | |
284 | \r | |
285 | This routine accepts a request to "lock" SMRAM. The\r | |
286 | region could be legacy AB or TSEG near top of physical memory.\r | |
287 | The use of "lock" means that the memory can no longer be opened\r | |
288 | to BS state..\r | |
289 | \r | |
290 | Arguments:\r | |
291 | \r | |
292 | This - Pointer to the SMM Access Interface.\r | |
293 | DescriptorIndex - Region of SMRAM to Lock.\r | |
294 | \r | |
295 | Returns:\r | |
296 | \r | |
297 | EFI_SUCCESS - The region was successfully locked.\r | |
298 | EFI_DEVICE_ERROR - The region could not be locked because at least\r | |
299 | one range is still open.\r | |
300 | EFI_INVALID_PARAMETER - The descriptor index was out of bounds.\r | |
301 | \r | |
302 | --*/\r | |
303 | {\r | |
304 | SMM_ACCESS_PRIVATE_DATA *SmmAccess;\r | |
305 | \r | |
306 | SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);\r | |
307 | \r | |
308 | if (SmmAccess->SmmAccess.OpenState) {\r | |
309 | return EFI_DEVICE_ERROR;\r | |
310 | }\r | |
311 | \r | |
312 | mSmmAccess.SMMRegionState |= EFI_SMRAM_LOCKED;\r | |
313 | SyncRegionState2SmramDesc(TRUE, EFI_SMRAM_LOCKED);\r | |
314 | SmmAccess->SmmAccess.LockState = TRUE;\r | |
315 | \r | |
316 | //\r | |
317 | // Lock TSEG\r | |
318 | //\r | |
319 | QNCLockSmramRegion ();\r | |
320 | \r | |
321 | return EFI_SUCCESS;\r | |
322 | }\r | |
323 | \r | |
324 | EFI_STATUS\r | |
325 | EFIAPI\r | |
326 | GetCapabilities (\r | |
327 | IN CONST EFI_SMM_ACCESS2_PROTOCOL *This,\r | |
328 | IN OUT UINTN *SmramMapSize,\r | |
329 | IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap\r | |
330 | )\r | |
331 | /*++\r | |
332 | \r | |
333 | Routine Description:\r | |
334 | \r | |
335 | This routine services a user request to discover the SMRAM\r | |
336 | capabilities of this platform. This will report the possible\r | |
337 | ranges that are possible for SMRAM access, based upon the\r | |
338 | memory controller capabilities.\r | |
339 | \r | |
340 | Arguments:\r | |
341 | \r | |
342 | This - Pointer to the SMRAM Access Interface.\r | |
343 | SmramMapSize - Pointer to the variable containing size of the\r | |
344 | buffer to contain the description information.\r | |
345 | SmramMap - Buffer containing the data describing the Smram\r | |
346 | region descriptors.\r | |
347 | Returns:\r | |
348 | \r | |
349 | EFI_BUFFER_TOO_SMALL - The user did not provide a sufficient buffer.\r | |
350 | EFI_SUCCESS - The user provided a sufficiently-sized buffer.\r | |
351 | \r | |
352 | --*/\r | |
353 | {\r | |
354 | EFI_STATUS Status;\r | |
355 | SMM_ACCESS_PRIVATE_DATA *SmmAccess;\r | |
356 | UINTN BufferSize;\r | |
357 | \r | |
358 | SmmAccess = SMM_ACCESS_PRIVATE_DATA_FROM_THIS (This);\r | |
359 | BufferSize = SmmAccess->NumberRegions * sizeof (EFI_SMRAM_DESCRIPTOR);\r | |
360 | \r | |
361 | if (*SmramMapSize < BufferSize) {\r | |
362 | Status = EFI_BUFFER_TOO_SMALL;\r | |
363 | } else {\r | |
364 | CopyMem (SmramMap, SmmAccess->SmramDesc, *SmramMapSize);\r | |
365 | Status = EFI_SUCCESS;\r | |
366 | }\r | |
367 | *SmramMapSize = BufferSize;\r | |
368 | \r | |
369 | return Status;\r | |
370 | }\r | |
371 | \r | |
372 | VOID\r | |
373 | SmmAccessOnBoot (\r | |
374 | IN EFI_EVENT Event,\r | |
375 | IN VOID *Context\r | |
376 | )\r | |
377 | {\r | |
378 | \r | |
379 | }\r | |
380 | VOID\r | |
381 | SyncRegionState2SmramDesc(\r | |
382 | IN BOOLEAN OrAnd,\r | |
383 | IN UINT64 Value\r | |
384 | )\r | |
385 | {\r | |
386 | UINT32 Index;\r | |
387 | \r | |
388 | for (Index = 0; Index < mSmmAccess.NumberRegions; Index++) {\r | |
389 | if (OrAnd) {\r | |
390 | mSmmAccess.SmramDesc[Index].RegionState |= Value;\r | |
391 | } else {\r | |
392 | mSmmAccess.SmramDesc[Index].RegionState &= Value;\r | |
393 | }\r | |
394 | }\r | |
395 | }\r |