5857fba5fd
The LPIT is the part of the "standardized" way that one can enumerate various power state information on Intel platforms. The documentation for this change can be found here: http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf Reviewed By: jhb Approved By: jhb Differential Revision: https://reviews.freebsd.org/D15931
204 lines
6.0 KiB
Groff
204 lines
6.0 KiB
Groff
.\" ACPI (ACPI Package)
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.\"
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.\" Copyright (c) 1999 Doug Rabson <dfr@FreeBSD.org>
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.\" Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
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.\" Copyright (c) 2000 Yasuo YOKOYAMA <yokoyama@jp.FreeBSD.org>
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.\" Copyright (c) 2000 Hiroki Sato <hrs@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 10, 2018
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.Dt ACPIDUMP 8
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.Os
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.Sh NAME
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.Nm acpidump
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.Nd dump ACPI tables and ASL
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Op Fl t
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.Op Fl h
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.Op Fl v
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.Op Fl f Ar dsdt_input
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.Op Fl o Ar dsdt_output
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.Sh DESCRIPTION
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The
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.Nm
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utility analyzes ACPI tables in physical memory and can dump them to a file.
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In addition,
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.Nm
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can call
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.Xr iasl 8
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to disassemble AML
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(ACPI Machine Language)
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found in these tables and dump them as ASL
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(ACPI Source Language)
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to stdout.
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.Pp
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ACPI tables have an essential data block (the DSDT,
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Differentiated System Description Table)
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that includes information used on the kernel side such as
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detailed information about PnP hardware, procedures for controlling
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power management support, and so on.
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The
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.Nm
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utility can extract the DSDT data block from physical memory and store it into
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an output file and optionally also disassemble it.
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If any Secondary System Description Table
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(SSDT)
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entries exist, they will also be included in the output file and disassembly.
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.Pp
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When
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.Nm
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is invoked without the
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.Fl f
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option, it will read ACPI tables from physical memory via
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.Pa /dev/mem .
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First it searches for the RSDP
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(Root System Description Pointer),
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which has the signature
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.Qq RSD PTR\ \& ,
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and then gets the RSDT
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(Root System Description Table),
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which includes a list of pointers to physical memory addresses
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for other tables.
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The RSDT itself and all other tables linked from RSDT are generically
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called SDTs
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(System Description Tables)
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and their header has a common format which consists of items
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such as Signature, Length, Revision, Checksum, OEMID, OEM Table ID,
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OEM Revision, Creator ID and Creator Revision.
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When invoked with the
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.Fl t
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flag, the
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.Nm
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utility dumps contents of the following tables:
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.Pp
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.Bl -tag -offset indent -width 12345 -compact
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.It DMAR
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.It DSDT
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.It ECDT
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.It FACS
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.It FADT
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.It HPET
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.It LPIT
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.It MADT
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.It MCFG
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.It NFIT
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.It RSD PTR
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.It RSDT
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.It WDDT
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.El
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.Pp
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The RSDT contains a pointer to the physical memory address of the FACP
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(Fixed ACPI Description Table).
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The FACP defines static system information about power management support
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(ACPI Hardware Register Implementation)
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such as interrupt mode (INT_MODEL),
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SCI interrupt number, SMI command port (SMI_CMD)
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and the location of ACPI registers.
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The FACP also has a pointer to a physical memory address for the DSDT.
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While the other tables are fixed format,
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the DSDT consists of free-formatted AML data.
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.Sh OPTIONS
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The following options are supported by
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.Nm :
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.Bl -tag -width indent
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.It Fl d
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Disassemble the DSDT into ASL using
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.Xr iasl 8
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and print the results to stdout.
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.It Fl t
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Dump the contents of the various fixed tables listed above.
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.It Fl h
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Displays usage and exit.
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.It Fl v
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Enable verbose messages.
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.It Fl f Ar dsdt_input
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Load the DSDT from the specified file instead of physical memory.
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Since only the DSDT is stored in the file, the
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.Fl t
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flag may not be used with this option.
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.It Fl o Ar dsdt_output
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Store the DSDT data block from physical memory into the specified file.
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.El
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.Sh FILES
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.Bl -tag -width /dev/mem
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.It Pa /dev/mem
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.El
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.Sh EXAMPLES
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If a developer requests a copy of your ASL, please use the following
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command to dump all tables and compress the result.
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.Bd -literal -offset indent
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# acpidump -dt | gzip -c9 > my_computer.asl.gz
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.Ed
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.Pp
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This example dumps the DSDT from physical memory to foo.dsdt.
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It also prints the contents of various system tables and disassembles
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the AML contained in the DSDT to stdout, redirecting the output
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to foo.asl.
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.Bd -literal -offset indent
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# acpidump -t -d -o foo.dsdt > foo.asl
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.Ed
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.Pp
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This example reads a DSDT file and disassembles it to stdout.
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Verbose messages are enabled.
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.Bd -literal -offset indent
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# acpidump -v -d -f foo.dsdt
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.Ed
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr mem 4 ,
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.Xr acpiconf 8 ,
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.Xr acpidb 8 ,
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.Xr iasl 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 5.0
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and was rewritten to use
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.Xr iasl 8
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for
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.Fx 5.2 .
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.Sh AUTHORS
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.An Doug Rabson Aq Mt dfr@FreeBSD.org
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.An Mitsuru IWASAKI Aq Mt iwasaki@FreeBSD.org
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.An Yasuo YOKOYAMA Aq Mt yokoyama@jp.FreeBSD.org
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.An Nate Lawson Aq Mt njl@FreeBSD.org
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.Pp
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.An -nosplit
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Some contributions made by
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.An Chitoshi Ohsawa Aq Mt ohsawa@catv1.ccn-net.ne.jp ,
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.An Takayasu IWANASHI Aq Mt takayasu@wendy.a.perfect-liberty.or.jp ,
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.An Yoshihiko SARUMARU Aq Mt mistral@imasy.or.jp ,
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.An Hiroki Sato Aq Mt hrs@FreeBSD.org ,
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.An Michael Lucas Aq Mt mwlucas@blackhelicopters.org
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and
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.An Michael Smith Aq Mt msmith@FreeBSD.org .
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.Sh BUGS
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The current implementation does not dump the BOOT structure or
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other miscellaneous tables.
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