Ahci

Overview

Ahci is a UEFI DXE driver that implements the Advanced Host Controller Interface (AHCI) for SATA host controllers. It provides EFI_BLOCK_IO_PROTOCOL, EFI_BLOCK_IO2_PROTOCOL, and EFI_ATA_PASS_THRU_PROTOCOL interfaces for mass storage devices connected via SATA. The driver manages AHCI controller initialization, port detection and configuration, command list and FIS management, and performs SATA device I/O through the AHCI register interface.

Key Functions

• AhciDriverEntryPoint() -- Entry point; installs driver binding, component name, and ATA pass thru protocols
• AhciDriverBindingSupported() -- Tests if a controller is an AHCI-compatible SATA controller
• AhciDriverBindingStart() -- Initializes the AHCI controller and detects attached devices
• AhciDriverBindingStop() -- Stops the driver, releases controller resources
• AhciCreateDevice() -- Creates a child device handle for a detected SATA device
• AhciBlockIoReadWrite() -- Performs block-level read/write via the AHCI HBA
• AhciAtaPassThru() -- Implements ATA pass-through commands (IDENTIFY, READ/WRITE, etc.)
• AhciGetHobList() -- Retrieves HOB list for platform configuration
• AhciReadUint32Le() -- Reads a little-endian 32-bit AHCI register value

Dependencies

• EFI_DRIVER_BINDING_PROTOCOL -- UEFI driver model
• EFI_BLOCK_IO_PROTOCOL -- Block device access (produced)
• EFI_BLOCK_IO2_PROTOCOL -- Async block device access (produced)
• EFI_ATA_PASS_THRU_PROTOCOL -- ATA pass-through commands (produced)
• EFI_COMPONENT_NAME2_PROTOCOL -- Component name reporting
• EFI_PCI_IO_PROTOCOL -- PCI configuration and MMIO access
• EFI_IDE_CONTROLLER_INIT_PROTOCOL -- IDE controller initialization
• EFI_DEVICE_PATH_PROTOCOL -- Device path management

Platform

• Architecture: x86-64 (PE32+)
• Subsystem: EFI_BOOT_SERVICE_DRIVER (0x0B)
• Toolchain: VS2015, X64 DEBUG
• Copyright: AMI Corporation
• Source: AmiModulePkg
• BIOS: HR650X (HR6N0XMLK)