DiskIoDxe

Overview

DiskIoDxe is a UEFI DXE driver that translates byte-addressable Disk I/O requests into block-aligned Block I/O operations. It produces EFI_DISK_IO_PROTOCOL and EFI_DISK_IO2_PROTOCOL on top of the underlying EFI_BLOCK_IO_PROTOCOL / EFI_BLOCK_IO2_PROTOCOL, allowing upper-layer UEFI components to perform fine-grained reads and writes without needing to manage block alignment themselves. The driver supports asynchronous I/O via the Disk I/O 2 protocol with task queuing and lock-based synchronization.

Key Functions

• DiskIoDriverEntryPoint() -- Module entry point; installs driver binding and component name protocols
• DiskIoDriverBindingSupported() -- Tests whether a controller supports the Disk I/O protocol
• DiskIoDriverBindingStart() -- Starts the Disk I/O driver on a controller, installs DiskIo protocol instances
• DiskIoDriverBindingStop() -- Stops the Disk I/O driver, uninstalls protocols and frees resources
• DiskIoReadWriteDisk() -- Core read/write function that translates byte I/O to block I/O
• DiskIo2ReadWriteDisk() -- Asynchronous read/write via Disk I/O 2 protocol
• DiskIoComponentNameGetDriverName() -- Returns the driver name ("Generic Disk I/O Driver")
• DiskIoComponentNameGetControllerName() -- Returns the controller name

Dependencies

• EFI_BLOCK_IO_PROTOCOL -- Underlying block device access
• EFI_BLOCK_IO2_PROTOCOL -- Underlying asynchronous block device access
• EFI_DISK_IO_PROTOCOL -- Produced protocol for byte-level disk I/O
• EFI_DISK_IO2_PROTOCOL -- Produced protocol for async byte-level disk I/O
• EFI_DRIVER_BINDING_PROTOCOL -- UEFI driver model
• EFI_COMPONENT_NAME2_PROTOCOL -- Component name reporting
• DEBUG_PRINT_ERROR_LEVEL_PROTOCOL -- Debug output control

Platform

• Architecture: x86-64 (PE32+)
• Subsystem: EFI_BOOT_SERVICE_DRIVER (0x0B)
• Copyright: Intel Corporation / Insyde Software Corporation
• Source: MdeModulePkg
• BIOS: HR650X (HR6N0XMLK)