.\"
.\" Copyright (c) 2025-2026 Netflix, Inc.
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.Dd July 7, 2026
.Dt ACPI_EINJ 4
.Os
.Sh NAME
.Nm acpi_einj
.Nd ACPI platform error injection module
.Sh SYNOPSIS
.In dev/acpica/acpiio.h
.Sh DESCRIPTION
The
.Nm
modules provides support for the error injection facility from the ACPI
Platform Error Interface
.Pq APEI .
This module parses the EINJ table to construct a list of instructions
associated with actions.
The module provides several
.Xr ioctl 2
commands on the
.Fa /dev/acpi
character device used by the
.Xr einj 8
utility.
.Sh IOCTLS
The following commands are supported:
.Bl -tag -width indent
.It Dv ACPIIO_EINJ_GET_INFO
Returns a
.Vt struct acpi_einj_info
object to the caller.
.It Dv ACPIIO_EINJ_GET_VENDOR
If the host supports the
.Cm SET_ERROR_TYPE_WITH_ADDRESS
command that includes a vendor extension structure,
this command stores a copy of the vendor extension structure in the buffer
described by the caller-provided
.Vt struct acpi_einj_vendor_info .
.It Dv ACPIIO_EINJ_SET_ERROR
Injects a platform error described by a
.Vt struct acpi_einj_error
object provided by the caller.
.El
.Sh FILES
.Bl -tag -width "/boot/kernel/acpi_einj.ko" -compact
.It Pa /boot/kernel/acpi_einj.ko
.Sh SEE ALSO
.Xr acpi 4 ,
.Xr einj 8
.El
.Sh HISTORY
The
.Nm
module first appeared in
.Fx 16.0 .