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AMI-Aptio-BIOS-Reversed / AmiModulePkg / CSM / Aint13 / README.md
@Ajax Dong Ajax Dong 7 days ago 2 KB Recovering names
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Aint13

Index: 0223 | Size: 4,608 bytes (9,216 body) | Phase: DXE

Overview

UEFI DXE driver providing legacy INT 13h disk I/O service compatibility for AHCI/SATA controllers. Discovers AHCI mass storage controllers via PCI I/O protocol, enumerates attached block devices (ATA and ATAPI), and wires them into real-mode INT 13h dispatch infrastructure. Parses MBR/EBR partition tables for CHS geometry optimization and programs INT 13h vector tables into legacy BIOS real-mode memory. Supports up to 8 disks with both native ATA and ATAPI (CD/DVD) devices.

Key Functions

  • _ModuleEntryPoint -- DXE entry: saves globals, calls sub_18FC, installs protocol interface with sub_624 callback.
  • sub_624 -- Module init: PCI enumeration via PciIo protocol, memory allocation, timer registration (88ms).
  • sub_18BC -- ASSERT/debug helper used in entry/init validation.
  • sub_18FC -- HOB table initialization helper.
  • sub_1634 -- Chipset-specific INT 13h vector programming (AInt13Csp.c split file).
  • sub_10CC -- Core dispatcher: opens PCI bridge, locates chipset-specific protocols, calls geometry setup per disk.
  • sub_BD4 -- Per-disk geometry setup: 42-byte descriptor builder.
  • sub_A50 -- ATA geometry extraction from identify data.
  • sub_86C -- MBR/EBR CHS geometry adjustment.
  • sub_794 -- CHS geometry calculation helper.
  • sub_E88 -- INT 13h handler registration record builder.
  • sub_52C -- Timer callback that reprograms chipset INT13h vectors.
  • sub_480 -- PCI/ATA device enumeration helper.
  • sub_17F4 -- Lazy debug protocol acquisition.
  • sub_1874 -- Conditional debug print helper.
  • sub_19D4 -- CMOS debug-level fetch.
  • sub_1A24 -- GUID compare helper.
  • sub_1A94 -- Unaligned 64-bit read helper.

Module split

  • Aint13.c contains module entry/recovery scaffolding.
  • AInt13Csp.c contains platform chipset behavior, including sub_1634 and hardware programming details.

Recovered Variables

  • mImageHandle
  • mSystemTable
  • mBootServices
  • mRuntimeServices
  • mAint13ProtocolGuid
  • byte_2149 (mAint13InitDone)
  • n8_2148 (mAint13DiskCount)
  • psub_624 (mModuleProtocolThunk)
  • qword_2140 (mInt13VectorTableBase)
  • dword_21C0 (mPciMmrAddress)

Protocols/Dependencies

  • PCI I/O Protocol (B2FA4764-...), UEFI Boot Services
  • Chipset-specific protocol A (DB9A1E3D-...) for PCI bridge config
  • CMOS/RTC I/O (ports 0x70/0x71) for debug level

Platform

Intel Purley (Xeon Scalable), HR650X -- AMI AmiModulePkg/AHCI/Aint13/