PartitionDxe

Overview

PartitionDxe is a UEFI partition driver that produces EFI_BLOCK_IO_PROTOCOL and EFI_BLOCK_IO2_PROTOCOL instances for each partition discovered on a parent block device. It supports MBR (Master Boot Record), GPT (GUID Partition Table), and El Torito (CD-ROM boot) partitioning schemes. The driver installs child handles for each valid partition, implements partition overlap detection, and follows the standard UEFI driver binding model.

Key Functions

• PartitionDriverEntryPoint() -- Entry point; installs driver binding and component name 2 protocols
• PartitionDriverBindingSupported() -- Tests if a block device supports partition enumeration
• PartitionDriverBindingStart() -- Enumerates partitions on a block device
• PartitionDriverBindingStop() -- Removes partition child handles
• PartitionInstallGptChildHandles() -- Installs child handles for GPT partitions
• PartitionInstallMbrChildHandles() -- Installs child handles for MBR partitions
• PartitionInstallEltChildHandles() -- Installs child handles for El Torito (CD-ROM) partitions
• PartitionValidMbr() -- Validates an MBR sector
• PartitionValidGptTable() -- Validates a GPT header and partition entries

Dependencies

• EFI_BLOCK_IO_PROTOCOL -- Parent block device protocol
• EFI_BLOCK_IO2_PROTOCOL -- Parent block device protocol (async)
• EFI_DRIVER_BINDING_PROTOCOL -- UEFI driver model
• EFI_COMPONENT_NAME2_PROTOCOL -- Component name reporting
• EFI_DEVICE_PATH_PROTOCOL -- Partition device path nodes

Platform

• Architecture: x86-64 (PE32+)
• Subsystem: EFI_BOOT_SERVICE_DRIVER (0x0B)
• Copyright: Intel Corporation
• License: BSD-2-Clause-Patent
• Source: MdeModulePkg
• BIOS: HR650X (HR6N0XMLK)