freebsd-dev/usr.sbin/acpi/acpidump/acpidump.8

.\" ACPI (ACPI Package)
.\"
.\" Copyright (c) 1999 Doug Rabson <dfr@FreeBSD.org>
.\" Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
.\" Copyright (c) 2000 Yasuo YOKOYAMA <yokoyama@jp.FreeBSD.org>
.\" Copyright (c) 2000 Hiroki Sato <hrs@FreeBSD.org>
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.Dd August 31, 2000
.Dt ACPIDUMP 8
.Os
.Sh NAME
.Nm acpidump
.Nd dump ACPI tables
.Sh SYNOPSIS
.Nm
.Op Fl r
.Nm
.Op Fl r
.Op Fl o Ar dsdt_file_for_output
.Nm
.Op Fl r
.Op Fl f Ar dsdt_file_for_input
.Sh DESCRIPTION
The
.Nm
command analyzes ACPI tables in physical memory and dumps them to standard output.
In addition,
.Nm
can disassemble AML
(ACPI Machine Language)
found in these tables and dump them as ASL
(ACPI Source Language).
.Pp
ACPI tables have an essential data block (the DSDT,
Differentiated System Description Table),
that includes information used on the kernel side such as
detailed information about PnP hardware, procedures for controlling
power management support and so on.
.Nm
can extract the DSDT data block from physical memory and store it into
a DSDT data file, and also can generate an output in ASL
from a given DSDT data file.
.Pp
When
.Nm
is invoked without the
.Fl f
option, it will read ACPI tables from physical
memory via a special file
.Pa /dev/mem
and dump them.  First it searches for the RSDP
(Root System Description Pointer),
which has the signature
.Qq RSD PTR\ \& ,
and then gets the RSDT
(Root System Description Table),
which includes a list of pointers to physical memory addresses
for other tables.
The RSDT itself and all other tables linked from RSDT are generically
called SDTs
(System Description Tables)
and their header has a common format which consists of items
such as Signature, Length, Revision, Checksum, OEMID, OEM Table ID,
OEM Revision, Creator ID and Creator Revision.
.Nm
dumps contents of these SDTs.
For further information about formats of each table,
see chapter 5: 
.Dq ACPI Software Programming Model 
from the ACPI specifications referenced below.
.Pp
There is always a pointer to a physical memory address in RSDT for FACP
(Fixed ACPI Description Table).
The FACP defines static system information about power management support
(ACPI Hardware Register Implementation)
such as interrupt mode
(INT_MODEL),
SCI interrupt number, SMI command port
(SMI_CMD)
and location of ACPI registers.
The FACP also has a pointer to a physical memory address for DSDT,
which includes information used on the kernel side such as
PnP, power management support and so on.
While the other tables are described in fixed format,
the DSDT consists of AML data which is compiled from sources
written in free formated ASL, which is the description language for ACPI.
When
.Nm
outputs DSDT, it disassembles the AML data and
formats it as ASL.
.Sh OPTIONS
The following options are supported by
.Nm :
.Bl -tag -width indent
.It Fl o Ar dsdt_file_for_output
Stores DSDT data block from physical memory into a file specified in
.Ar dsdt_file_for_output
in addition to behavior with no option.
.It Fl f Ar dsdt_file_for_input
Interprets AML data in DSDT from a file specified in
.Ar dsdt_file_for_input
and dumps them in ASL to standard output.
.It Fl r
Additionally outputs commented ResourceTemplate() macros for Buffer
objects that contain valid resource streams.
These macros are defined in the ACPI 2.0 specification section
16.2.4.
.It Fl h
Displays usage and exit.
.El
.Sh EXAMPLES
This is an example to get a dump of SDTs and a DSDT data file
simultaneously on a machine that supports ACPI BIOS.
.Bd -literal -offset indent
# acpidump -o foo.dsdt > foo.asl
.Ed
.Sh BUGS
In the current implementation,
.Nm
doesn't dump any information of Firmware ACPI Control Structure
(FACS)
specified by a pointer in FACP.
.Sh FILES
.Bl -tag -width /dev/mem
.It Pa /dev/mem
.El
.Sh SEE ALSO
.Xr acpi 4 ,
.Xr mem 4 ,
.Xr acpiconf 8 ,
.Xr amldb 8
.Pp
.Dq Advanced Configuration and Power Interface Specification
.Bd -literal -offset indent -compact
Intel
Microsoft
Toshiba
Revision 1.0b, 2.0
.Ed
<URL:http://www.teleport.com/~acpi/>
.Sh AUTHORS
.An Doug Rabson Aq dfr@FreeBSD.org
.An Mitsuru IWASAKI Aq iwasaki@FreeBSD.org
.An Yasuo YOKOYAMA Aq yokoyama@jp.FreeBSD.org
.Pp
Some contributions made by
.An Chitoshi Ohsawa Aq ohsawa@catv1.ccn-net.ne.jp ,
.An Takayasu IWANASHI Aq takayasu@wendy.a.perfect-liberty.or.jp ,
.An Yoshihiko SARUMARU Aq mistral@imasy.or.jp ,
.An Hiroki Sato Aq hrs@FreeBSD.org ,
.An Michael Lucas Aq mwlucas@blackhelicopters.org
and
.An Michael Smith Aq msmith@freebsd.org .
.Sh HISTORY
The
.Nm
command appeared in
.Fx 5.0 .