1 /** @file 2 This file implements Runtime Architectural Protocol as defined in the 3 Platform Initialization specification 1.0 VOLUME 2 DXE Core Interface. 4 5 This code is used to produce the EFI runtime virtual switch over 6 7 THIS IS VERY DANGEROUS CODE BE VERY CAREFUL IF YOU CHANGE IT 8 9 The transition for calling EFI Runtime functions in physical mode to calling 10 them in virtual mode is very very complex. Every pointer in needs to be 11 converted from physical mode to virtual mode. Be very careful walking linked 12 lists! Then to make it really hard the code it's self needs be relocated into 13 the new virtual address space. 14 15 So here is the concept. The code in this module will never ever be called in 16 virtual mode. This is the code that collects the information needed to convert 17 to virtual mode (DXE core registers runtime stuff with this code). Since this 18 code is used to fix up all runtime images, it CAN NOT fix it's self up. So some 19 code has to stay behind and that is us. 20 21 Also you need to be careful about when you allocate memory, as once we are in 22 runtime (including our EVT_SIGNAL_EXIT_BOOT_SERVICES event) you can no longer 23 allocate memory. 24 25 Any runtime driver that gets loaded before us will not be callable in virtual 26 mode. This is due to the fact that the DXE core can not register the info 27 needed with us. This is good, since it keeps the code in this file from 28 getting registered. 29 30 31 Revision History: 32 33 - Move the CalculateCrc32 function from Runtime Arch Protocol to Boot Service. 34 Runtime Arch Protocol definition no longer contains CalculateCrc32. Boot Service 35 Table now contains an item named CalculateCrc32. 36 37 38 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR> 39 This program and the accompanying materials 40 are licensed and made available under the terms and conditions of the BSD License 41 which accompanies this distribution. The full text of the license may be found at 42 http://opensource.org/licenses/bsd-license.php 43 44 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 45 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 46 47 **/ 48 49 #include "Runtime.h" 50 51 // 52 // Global Variables 53 // 54 EFI_MEMORY_DESCRIPTOR *mVirtualMap = NULL; 55 UINTN mVirtualMapDescriptorSize; 56 UINTN mVirtualMapMaxIndex; 57 VOID *mMyImageBase; 58 59 // 60 // The handle onto which the Runtime Architectural Protocol instance is installed 61 // 62 EFI_HANDLE mRuntimeHandle = NULL; 63 64 // 65 // The Runtime Architectural Protocol instance produced by this driver 66 // 67 EFI_RUNTIME_ARCH_PROTOCOL mRuntime = { 68 INITIALIZE_LIST_HEAD_VARIABLE (mRuntime.ImageHead), 69 INITIALIZE_LIST_HEAD_VARIABLE (mRuntime.EventHead), 70 71 // 72 // Make sure Size != sizeof (EFI_MEMORY_DESCRIPTOR). This will 73 // prevent people from having pointer math bugs in their code. 74 // now you have to use *DescriptorSize to make things work. 75 // 76 sizeof (EFI_MEMORY_DESCRIPTOR) + sizeof (UINT64) - (sizeof (EFI_MEMORY_DESCRIPTOR) % sizeof (UINT64)), 77 EFI_MEMORY_DESCRIPTOR_VERSION, 78 0, 79 NULL, 80 NULL, 81 FALSE, 82 FALSE 83 }; 84 85 // 86 // Worker Functions 87 // 88 /** 89 90 Calculate the 32-bit CRC in a EFI table using the Runtime Drivers 91 internal function. The EFI Boot Services Table can not be used because 92 the EFI Boot Services Table was destroyed at ExitBootServices(). 93 This is a internal function. 94 95 96 @param Hdr Pointer to an EFI standard header 97 98 **/ 99 VOID 100 RuntimeDriverCalculateEfiHdrCrc ( 101 IN OUT EFI_TABLE_HEADER *Hdr 102 ) 103 { 104 UINT32 Crc; 105 106 Hdr->CRC32 = 0; 107 108 Crc = 0; 109 RuntimeDriverCalculateCrc32 ((UINT8 *) Hdr, Hdr->HeaderSize, &Crc); 110 Hdr->CRC32 = Crc; 111 } 112 113 /** 114 115 Determines the new virtual address that is to be used on subsequent memory accesses. 116 117 118 @param DebugDisposition Supplies type information for the pointer being converted. 119 @param ConvertAddress A pointer to a pointer that is to be fixed to be the value needed 120 for the new virtual address mappings being applied. 121 122 @retval EFI_SUCCESS The pointer pointed to by Address was modified. 123 @retval EFI_NOT_FOUND The pointer pointed to by Address was not found to be part 124 of the current memory map. This is normally fatal. 125 @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value. 126 127 **/ 128 EFI_STATUS 129 EFIAPI 130 RuntimeDriverConvertPointer ( 131 IN UINTN DebugDisposition, 132 IN OUT VOID **ConvertAddress 133 ) 134 { 135 UINTN Address; 136 UINT64 VirtEndOfRange; 137 EFI_MEMORY_DESCRIPTOR *VirtEntry; 138 UINTN Index; 139 140 // 141 // Make sure ConvertAddress is a valid pointer 142 // 143 if (ConvertAddress == NULL) { 144 return EFI_INVALID_PARAMETER; 145 } 146 // 147 // Get the address to convert 148 // 149 Address = (UINTN) *ConvertAddress; 150 151 // 152 // If this is a null pointer, return if it's allowed 153 // 154 if (Address == 0) { 155 if ((DebugDisposition & EFI_OPTIONAL_PTR) != 0) { 156 return EFI_SUCCESS; 157 } 158 159 return EFI_INVALID_PARAMETER; 160 } 161 162 VirtEntry = mVirtualMap; 163 for (Index = 0; Index < mVirtualMapMaxIndex; Index++) { 164 // 165 // To prevent the inclusion of 64-bit math functions a UINTN was placed in 166 // front of VirtEntry->NumberOfPages to cast it to a 32-bit thing on IA-32 167 // platforms. If you get this ASSERT remove the UINTN and do a 64-bit 168 // multiply. 169 // 170 ASSERT (((UINTN) VirtEntry->NumberOfPages < 0xffffffff) || (sizeof (UINTN) > 4)); 171 172 if ((VirtEntry->Attribute & EFI_MEMORY_RUNTIME) == EFI_MEMORY_RUNTIME) { 173 if (Address >= VirtEntry->PhysicalStart) { 174 VirtEndOfRange = VirtEntry->PhysicalStart + (((UINTN) VirtEntry->NumberOfPages) * EFI_PAGE_SIZE); 175 if (Address < VirtEndOfRange) { 176 // 177 // Compute new address 178 // 179 *ConvertAddress = (VOID *) (Address - (UINTN) VirtEntry->PhysicalStart + (UINTN) VirtEntry->VirtualStart); 180 return EFI_SUCCESS; 181 } 182 } 183 } 184 185 VirtEntry = NEXT_MEMORY_DESCRIPTOR (VirtEntry, mVirtualMapDescriptorSize); 186 } 187 188 return EFI_NOT_FOUND; 189 } 190 191 /** 192 193 Determines the new virtual address that is to be used on subsequent memory accesses 194 for internal pointers. 195 This is a internal function. 196 197 198 @param ConvertAddress A pointer to a pointer that is to be fixed to be the value needed 199 for the new virtual address mappings being applied. 200 201 @retval EFI_SUCCESS The pointer pointed to by Address was modified. 202 @retval EFI_NOT_FOUND The pointer pointed to by Address was not found to be part 203 of the current memory map. This is normally fatal. 204 @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value. 205 206 **/ 207 EFI_STATUS 208 RuntimeDriverConvertInternalPointer ( 209 IN OUT VOID **ConvertAddress 210 ) 211 { 212 return RuntimeDriverConvertPointer (0x0, ConvertAddress); 213 } 214 215 /** 216 217 Changes the runtime addressing mode of EFI firmware from physical to virtual. 218 219 220 @param MemoryMapSize The size in bytes of VirtualMap. 221 @param DescriptorSize The size in bytes of an entry in the VirtualMap. 222 @param DescriptorVersion The version of the structure entries in VirtualMap. 223 @param VirtualMap An array of memory descriptors which contain new virtual 224 address mapping information for all runtime ranges. 225 226 @retval EFI_SUCCESS The virtual address map has been applied. 227 @retval EFI_UNSUPPORTED EFI firmware is not at runtime, or the EFI firmware is already in 228 virtual address mapped mode. 229 @retval EFI_INVALID_PARAMETER DescriptorSize or DescriptorVersion is invalid. 230 @retval EFI_NO_MAPPING A virtual address was not supplied for a range in the memory 231 map that requires a mapping. 232 @retval EFI_NOT_FOUND A virtual address was supplied for an address that is not found 233 in the memory map. 234 235 **/ 236 EFI_STATUS 237 EFIAPI 238 RuntimeDriverSetVirtualAddressMap ( 239 IN UINTN MemoryMapSize, 240 IN UINTN DescriptorSize, 241 IN UINT32 DescriptorVersion, 242 IN EFI_MEMORY_DESCRIPTOR *VirtualMap 243 ) 244 { 245 EFI_STATUS Status; 246 EFI_RUNTIME_EVENT_ENTRY *RuntimeEvent; 247 EFI_RUNTIME_IMAGE_ENTRY *RuntimeImage; 248 LIST_ENTRY *Link; 249 EFI_PHYSICAL_ADDRESS VirtImageBase; 250 251 // 252 // Can only switch to virtual addresses once the memory map is locked down, 253 // and can only set it once 254 // 255 if (!mRuntime.AtRuntime || mRuntime.VirtualMode) { 256 return EFI_UNSUPPORTED; 257 } 258 // 259 // Only understand the original descriptor format 260 // 261 if (DescriptorVersion != EFI_MEMORY_DESCRIPTOR_VERSION || DescriptorSize < sizeof (EFI_MEMORY_DESCRIPTOR)) { 262 return EFI_INVALID_PARAMETER; 263 } 264 // 265 // We are now committed to go to virtual mode, so lets get to it! 266 // 267 mRuntime.VirtualMode = TRUE; 268 269 // 270 // ConvertPointer() needs this mVirtualMap to do the conversion. So set up 271 // globals we need to parse the virtual address map. 272 // 273 mVirtualMapDescriptorSize = DescriptorSize; 274 mVirtualMapMaxIndex = MemoryMapSize / DescriptorSize; 275 mVirtualMap = VirtualMap; 276 277 // 278 // ReporstStatusCodeLib will check and make sure this service can be called in runtime mode. 279 // 280 REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_SOFTWARE_EFI_RUNTIME_SERVICE | EFI_SW_RS_PC_SET_VIRTUAL_ADDRESS_MAP)); 281 282 // 283 // Report Status Code here since EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event will be signalled. 284 // 285 REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_SOFTWARE_DXE_BS_DRIVER | EFI_SW_DXE_BS_PC_VIRTUAL_ADDRESS_CHANGE_EVENT)); 286 287 // 288 // Signal all the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE events. 289 // All runtime events are stored in a list in Runtime AP. 290 // 291 for (Link = mRuntime.EventHead.ForwardLink; Link != &mRuntime.EventHead; Link = Link->ForwardLink) { 292 RuntimeEvent = BASE_CR (Link, EFI_RUNTIME_EVENT_ENTRY, Link); 293 if ((RuntimeEvent->Type & EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) == EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) { 294 RuntimeEvent->NotifyFunction ( 295 RuntimeEvent->Event, 296 RuntimeEvent->NotifyContext 297 ); 298 } 299 } 300 301 // 302 // Relocate runtime images. All runtime images are stored in a list in Runtime AP. 303 // 304 for (Link = mRuntime.ImageHead.ForwardLink; Link != &mRuntime.ImageHead; Link = Link->ForwardLink) { 305 RuntimeImage = BASE_CR (Link, EFI_RUNTIME_IMAGE_ENTRY, Link); 306 // 307 // We don't want to relocate our selves, as we only run in physical mode. 308 // 309 if (mMyImageBase != RuntimeImage->ImageBase) { 310 311 VirtImageBase = (EFI_PHYSICAL_ADDRESS) (UINTN) RuntimeImage->ImageBase; 312 Status = RuntimeDriverConvertPointer (0, (VOID **) &VirtImageBase); 313 ASSERT_EFI_ERROR (Status); 314 315 PeCoffLoaderRelocateImageForRuntime ( 316 (EFI_PHYSICAL_ADDRESS) (UINTN) RuntimeImage->ImageBase, 317 VirtImageBase, 318 (UINTN) RuntimeImage->ImageSize, 319 RuntimeImage->RelocationData 320 ); 321 322 InvalidateInstructionCacheRange (RuntimeImage->ImageBase, (UINTN) RuntimeImage->ImageSize); 323 } 324 } 325 326 // 327 // Convert all the Runtime Services except ConvertPointer() and SetVirtualAddressMap() 328 // and recompute the CRC-32 329 // 330 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->GetTime); 331 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->SetTime); 332 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->GetWakeupTime); 333 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->SetWakeupTime); 334 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->ResetSystem); 335 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->GetNextHighMonotonicCount); 336 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->GetVariable); 337 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->SetVariable); 338 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->GetNextVariableName); 339 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->QueryVariableInfo); 340 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->UpdateCapsule); 341 RuntimeDriverConvertInternalPointer ((VOID **) &gRT->QueryCapsuleCapabilities); 342 RuntimeDriverCalculateEfiHdrCrc (&gRT->Hdr); 343 344 // 345 // UEFI don't require System Configuration Tables Conversion. 346 // 347 348 // 349 // Convert the runtime fields of the EFI System Table and recompute the CRC-32 350 // 351 RuntimeDriverConvertInternalPointer ((VOID **) &gST->FirmwareVendor); 352 RuntimeDriverConvertInternalPointer ((VOID **) &gST->ConfigurationTable); 353 RuntimeDriverConvertInternalPointer ((VOID **) &gST->RuntimeServices); 354 RuntimeDriverCalculateEfiHdrCrc (&gST->Hdr); 355 356 // 357 // At this point, gRT and gST are physical pointers, but the contents of these tables 358 // have been converted to runtime. 359 // 360 // 361 // mVirtualMap is only valid during SetVirtualAddressMap() call 362 // 363 mVirtualMap = NULL; 364 365 return EFI_SUCCESS; 366 } 367 368 /** 369 Entry Point for Runtime driver. 370 371 This function installs Runtime Architectural Protocol and registers CalculateCrc32 boot services table, 372 SetVirtualAddressMap & ConvertPointer runtime services table. 373 374 @param ImageHandle Image handle of this driver. 375 @param SystemTable a Pointer to the EFI System Table. 376 377 @retval EFI_SUCEESS Runtime Driver Architectural Protocol is successfully installed 378 @return Others Some error occurs when installing Runtime Driver Architectural Protocol. 379 380 **/ 381 EFI_STATUS 382 EFIAPI 383 RuntimeDriverInitialize ( 384 IN EFI_HANDLE ImageHandle, 385 IN EFI_SYSTEM_TABLE *SystemTable 386 ) 387 { 388 EFI_STATUS Status; 389 EFI_LOADED_IMAGE_PROTOCOL *MyLoadedImage; 390 391 // 392 // This image needs to be excluded from relocation for virtual mode, so cache 393 // a copy of the Loaded Image protocol to test later. 394 // 395 Status = gBS->HandleProtocol ( 396 ImageHandle, 397 &gEfiLoadedImageProtocolGuid, 398 (VOID**)&MyLoadedImage 399 ); 400 ASSERT_EFI_ERROR (Status); 401 mMyImageBase = MyLoadedImage->ImageBase; 402 403 // 404 // Initialize the table used to compute 32-bit CRCs 405 // 406 RuntimeDriverInitializeCrc32Table (); 407 408 // 409 // Fill in the entries of the EFI Boot Services and EFI Runtime Services Tables 410 // 411 gBS->CalculateCrc32 = RuntimeDriverCalculateCrc32; 412 gRT->SetVirtualAddressMap = RuntimeDriverSetVirtualAddressMap; 413 gRT->ConvertPointer = RuntimeDriverConvertPointer; 414 415 // 416 // Install the Runtime Architectural Protocol onto a new handle 417 // 418 Status = gBS->InstallMultipleProtocolInterfaces ( 419 &mRuntimeHandle, 420 &gEfiRuntimeArchProtocolGuid, 421 &mRuntime, 422 NULL 423 ); 424 ASSERT_EFI_ERROR (Status); 425 426 return Status; 427 } 428
