- //\r
- // Reserved the memory space occupied by the firmware volume\r
- //\r
-\r
- SystemMemoryTop = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemoryBase) + (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemorySize);\r
- FdTop = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdFdBaseAddress) + (EFI_PHYSICAL_ADDRESS)PcdGet32 (PcdFdSize);\r
-\r
- // EDK2 does not have the concept of boot firmware copied into DRAM. To avoid the DXE\r
- // core to overwrite this area we must mark the region with the attribute non-present\r
- if ((PcdGet64 (PcdFdBaseAddress) >= PcdGet64 (PcdSystemMemoryBase)) && (FdTop <= SystemMemoryTop)) {\r
- Found = FALSE;\r
-\r
- // Search for System Memory Hob that contains the firmware\r
- NextHob.Raw = GetHobList ();\r
- while ((NextHob.Raw = GetNextHob (EFI_HOB_TYPE_RESOURCE_DESCRIPTOR, NextHob.Raw)) != NULL) {\r
- if ((NextHob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&\r
- (PcdGet64 (PcdFdBaseAddress) >= NextHob.ResourceDescriptor->PhysicalStart) &&\r
- (FdTop <= NextHob.ResourceDescriptor->PhysicalStart + NextHob.ResourceDescriptor->ResourceLength))\r
- {\r
- ResourceAttributes = NextHob.ResourceDescriptor->ResourceAttribute;\r
- ResourceLength = NextHob.ResourceDescriptor->ResourceLength;\r
- ResourceTop = NextHob.ResourceDescriptor->PhysicalStart + ResourceLength;\r
-\r
- if (PcdGet64 (PcdFdBaseAddress) == NextHob.ResourceDescriptor->PhysicalStart) {\r
- if (SystemMemoryTop == FdTop) {\r
- NextHob.ResourceDescriptor->ResourceAttribute = ResourceAttributes & ~EFI_RESOURCE_ATTRIBUTE_PRESENT;\r
- } else {\r
- // Create the System Memory HOB for the firmware with the non-present attribute\r
- BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY,\r
- ResourceAttributes & ~EFI_RESOURCE_ATTRIBUTE_PRESENT,\r
- PcdGet64 (PcdFdBaseAddress),\r
- PcdGet32 (PcdFdSize));\r
-\r
- // Top of the FD is system memory available for UEFI\r
- NextHob.ResourceDescriptor->PhysicalStart += PcdGet32(PcdFdSize);\r
- NextHob.ResourceDescriptor->ResourceLength -= PcdGet32(PcdFdSize);\r
- }\r
- } else {\r
- // Create the System Memory HOB for the firmware with the non-present attribute\r
- BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY,\r
- ResourceAttributes & ~EFI_RESOURCE_ATTRIBUTE_PRESENT,\r
- PcdGet64 (PcdFdBaseAddress),\r
- PcdGet32 (PcdFdSize));\r
-\r
- // Update the HOB\r
- NextHob.ResourceDescriptor->ResourceLength = PcdGet64 (PcdFdBaseAddress) - NextHob.ResourceDescriptor->PhysicalStart;\r
-\r
- // If there is some memory available on the top of the FD then create a HOB\r
- if (FdTop < NextHob.ResourceDescriptor->PhysicalStart + ResourceLength) {\r
- // Create the System Memory HOB for the remaining region (top of the FD)\r
- BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY,\r
- ResourceAttributes,\r
- FdTop,\r
- ResourceTop - FdTop);\r
- }\r
- }\r
- Found = TRUE;\r
- break;\r
- }\r
- NextHob.Raw = GET_NEXT_HOB (NextHob);\r
- }\r
-\r
- ASSERT(Found);\r
- }\r
-\r