78 lines
3.1 KiB
ReStructuredText
78 lines
3.1 KiB
ReStructuredText
.. _atkbdc_virt_hld:
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AT Keyboard Controller Emulation
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################################
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This document describes the AT keyboard controller emulation implementation in the ACRN device model. The Atkbdc device emulates a PS2 keyboard and mouse.
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Overview
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********
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The PS2 port is a 6-pin mini-Din connector used for connecting keyboards and mice to a PC-compatible computer system. Its name comes from the IBM Personal System/2 series of personal computers, with which it was introduced in 1987. PS2 keyboard/mouse emulation is based on ACPI Emulation. We can add ACPI description of PS2 keyboard/mouse into virtual DSDT table to emulate keyboard/mouse in the User VM.
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.. figure:: images/atkbdc-virt-hld.png
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:align: center
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:name: atkbdc-virt-arch
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AT keyboard controller emulation architecture
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PS2 Keyboard Emulation
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**********************
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ACRN supports the AT keyboard controller for PS2 keyboard that can be accessed through I/O ports (0x60 and 0x64). 0x60 is used to access AT keyboard controller data register; 0x64 is used to access AT keyboard controller address register.
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The PS2 keyboard ACPI description as below::
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Device (KBD)
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{
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Name (_HID, EisaId ("PNP0303") /* IBM Enhanced Keyboard (101/102-key, PS/2 Mouse) */) // _HID: Hardware ID
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Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
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{
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IO (Decode16,
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0x0060, // Range Minimum
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0x0060, // Range Maximum
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0x01, // Alignment
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0x01, // Length
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)
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IO (Decode16,
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0x0064, // Range Minimum
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0x0064, // Range Maximum
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0x01, // Alignment
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0x01, // Length
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)
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IRQNoFlags ()
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{1}
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})
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}
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PS2 Mouse Emulation
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*******************
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ACRN supports AT keyboard controller for PS2 mouse that can be accessed through I/O ports (0x60 and 0x64).
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0x60 is used to access AT keyboard controller data register; 0x64 is used to access AT keyboard controller address register.
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The PS2 mouse ACPI description as below::
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Device (MOU)
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{
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Name (_HID, EisaId ("PNP0F13") /* PS/2 Mouse */) // _HID: Hardware ID
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Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
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{
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IO (Decode16,
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0x0060, // Range Minimum
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0x0060, // Range Maximum
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0x01, // Alignment
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0x01, // Length
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)
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IO (Decode16,
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0x0064, // Range Minimum
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0x0064, // Range Maximum
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0x01, // Alignment
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0x01, // Length
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)
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IRQNoFlags ()
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{12}
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})
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}
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