--- /dev/null
+/**@file\r
+ This module sets default policy for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType.\r
+\r
+ This module sets EFI_MEMORY_XP for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType\r
+ in UEFI memory map, if and only of PropertiesTable is published and has BIT0 set.\r
+\r
+Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
+This program and the accompanying materials\r
+are licensed and made available under the terms and conditions of the BSD License\r
+which accompanies this distribution. The full text of the license may be found at\r
+http://opensource.org/licenses/bsd-license.php\r
+\r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+#include <Uefi.h>\r
+#include <Library/DebugLib.h>\r
+#include <Library/UefiBootServicesTableLib.h>\r
+#include <Library/DxeServicesTableLib.h>\r
+#include <Library/UefiLib.h>\r
+#include <Library/MemoryAllocationLib.h>\r
+#include <Guid/EventGroup.h>\r
+#include <Guid/PropertiesTable.h>\r
+\r
+/**\r
+ Converts a number of EFI_PAGEs to a size in bytes.\r
+\r
+ NOTE: Do not use EFI_PAGES_TO_SIZE because it handles UINTN only.\r
+\r
+ @param Pages The number of EFI_PAGES.\r
+\r
+ @return The number of bytes associated with the number of EFI_PAGEs specified\r
+ by Pages.\r
+**/\r
+UINT64\r
+EfiPagesToSize (\r
+ IN UINT64 Pages\r
+ )\r
+{\r
+ return LShiftU64 (Pages, EFI_PAGE_SHIFT);\r
+}\r
+\r
+/**\r
+ Set memory attributes according to default policy.\r
+\r
+ @param MemoryMap A pointer to the buffer in which firmware places the current memory map.\r
+ @param MemoryMapSize Size, in bytes, of the MemoryMap buffer.\r
+ @param DescriptorSize size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r
+**/\r
+VOID\r
+SetMemorySpaceAttributesDefault (\r
+ IN EFI_MEMORY_DESCRIPTOR *MemoryMap,\r
+ IN UINTN MemoryMapSize,\r
+ IN UINTN DescriptorSize\r
+ )\r
+{\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r
+ EFI_STATUS Status;\r
+\r
+ DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributesDefault\n"));\r
+\r
+ MemoryMapEntry = MemoryMap;\r
+ MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);\r
+ while ((UINTN)MemoryMapEntry < (UINTN)MemoryMapEnd) {\r
+ if (MemoryMapEntry->PhysicalStart < BASE_1MB) {\r
+ //\r
+ // Do not touch memory space below 1MB\r
+ //\r
+ MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ continue;\r
+ }\r
+ switch (MemoryMapEntry->Type) {\r
+ case EfiRuntimeServicesCode:\r
+ case EfiRuntimeServicesData:\r
+ //\r
+ // should be handled later;\r
+ //\r
+ break;\r
+ case EfiReservedMemoryType:\r
+ case EfiACPIMemoryNVS:\r
+ //\r
+ // Handle EfiReservedMemoryType and EfiACPIMemoryNVS, because there might be firmware executable there.\r
+ //\r
+ DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributes - %016lx - %016lx (%016lx) ...\n",\r
+ MemoryMapEntry->PhysicalStart,\r
+ MemoryMapEntry->PhysicalStart + EfiPagesToSize (MemoryMapEntry->NumberOfPages),\r
+ MemoryMapEntry->Attribute\r
+ ));\r
+ Status = gDS->SetMemorySpaceCapabilities (\r
+ MemoryMapEntry->PhysicalStart,\r
+ EfiPagesToSize (MemoryMapEntry->NumberOfPages),\r
+ MemoryMapEntry->Attribute | EFI_MEMORY_XP\r
+ );\r
+ DEBUG ((EFI_D_INFO, "SetMemorySpaceCapabilities - %r\n", Status));\r
+ break;\r
+ }\r
+\r
+ MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ }\r
+\r
+ return ;\r
+}\r
+\r
+/**\r
+ Update memory attributes according to default policy.\r
+\r
+ @param[in] Event The Event this notify function registered to.\r
+ @param[in] Context Pointer to the context data registered to the Event.\r
+**/\r
+VOID\r
+EFIAPI\r
+UpdateMemoryAttributesDefault (\r
+ EFI_EVENT Event,\r
+ VOID *Context\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
+ UINTN MemoryMapSize;\r
+ UINTN MapKey;\r
+ UINTN DescriptorSize;\r
+ UINT32 DescriptorVersion;\r
+ EFI_PROPERTIES_TABLE *PropertiesTable;\r
+\r
+ DEBUG ((EFI_D_INFO, "UpdateMemoryAttributesDefault\n"));\r
+ Status = EfiGetSystemConfigurationTable (&gEfiPropertiesTableGuid, &PropertiesTable);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ DEBUG ((EFI_D_INFO, "MemoryProtectionAttribute - 0x%016lx\n", PropertiesTable->MemoryProtectionAttribute));\r
+ if ((PropertiesTable->MemoryProtectionAttribute & EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) == 0) {\r
+ goto Done;\r
+ }\r
+\r
+ //\r
+ // Get the EFI memory map.\r
+ //\r
+ MemoryMapSize = 0;\r
+ MemoryMap = NULL;\r
+ Status = gBS->GetMemoryMap (\r
+ &MemoryMapSize,\r
+ MemoryMap,\r
+ &MapKey,\r
+ &DescriptorSize,\r
+ &DescriptorVersion\r
+ );\r
+ ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r
+ do {\r
+ MemoryMap = (EFI_MEMORY_DESCRIPTOR *) AllocatePool (MemoryMapSize);\r
+ ASSERT (MemoryMap != NULL);\r
+ Status = gBS->GetMemoryMap (\r
+ &MemoryMapSize,\r
+ MemoryMap,\r
+ &MapKey,\r
+ &DescriptorSize,\r
+ &DescriptorVersion\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ FreePool (MemoryMap);\r
+ }\r
+ } while (Status == EFI_BUFFER_TOO_SMALL);\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
+ SetMemorySpaceAttributesDefault (MemoryMap, MemoryMapSize, DescriptorSize);\r
+\r
+Done:\r
+ gBS->CloseEvent (Event);\r
+\r
+ return ;\r
+}\r
+\r
+/**\r
+ The entrypoint of properties table attribute driver.\r
+\r
+ @param ImageHandle The firmware allocated handle for the EFI image.\r
+ @param SystemTable A pointer to the EFI System Table.\r
+\r
+ @retval EFI_SUCCESS It always returns EFI_SUCCESS.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+InitializePropertiesTableAttributesDxe (\r
+ IN EFI_HANDLE ImageHandle,\r
+ IN EFI_SYSTEM_TABLE *SystemTable\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_EVENT ReadyToBootEvent;\r
+\r
+ Status = gBS->CreateEventEx (\r
+ EVT_NOTIFY_SIGNAL,\r
+ TPL_CALLBACK,\r
+ UpdateMemoryAttributesDefault,\r
+ NULL,\r
+ &gEfiEventReadyToBootGuid,\r
+ &ReadyToBootEvent\r
+ );\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
+ return EFI_SUCCESS;\r
+}\r
projects / mirror_edk2.git / blobdiff