1.\" $OpenBSD: acpidump.8,v 1.9 2008/10/30 22:08:57 sobrado Exp $ 2.\" 3.\" Copyright (c) 1999 Doug Rabson <dfr@FreeBSD.org> 4.\" Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org> 5.\" Copyright (c) 2000 Yasuo YOKOYAMA <yokoyama@jp.FreeBSD.org> 6.\" Copyright (c) 2000 Hiroki Sato <hrs@FreeBSD.org> 7.\" All rights reserved. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" $FreeBSD: src/usr.sbin/acpi/acpidump/acpidump.8,v 1.9 2001/09/05 19:21:25 dd Exp $ 31.\" 32.Dd $Mdocdate: October 30 2008 $ 33.Dt ACPIDUMP 8 34.Os 35.Sh NAME 36.Nm acpidump 37.Nd dump ACPI tables 38.Sh SYNOPSIS 39.Nm 40.Op Fl f Ar dsdt_file_for_input 41.Nm 42.Op Fl o Ar prefix_for_output 43.Sh DESCRIPTION 44The 45.Nm 46command analyzes ACPI tables in physical memory and dumps them to standard output. 47In addition, 48.Nm 49can disassemble some contents of the tables in AML 50(ACPI Machine Language) 51and dump them in ASL 52(ACPI Source Language). 53.Pp 54ACPI tables have an notably essential data block called DSDT 55(Differentiated System Description Table), 56that includes information used on the kernel side such as 57detailed information about PnP hardware, procedures for controlling 58power management support, and so on. 59.Nm 60can extract a DSDT data block from physical memory and store it into 61a DSDT data file, and can also generate an output in ASL 62from a given DSDT data file. 63.Pp 64The options are as follows: 65.Bl -tag -width indent 66.It Fl f Ar dsdt_file_for_input 67Interpret AML data in DSDT from a file specified in 68.Ar dsdt_file_for_input 69and dumps them in ASL to standard output. 70.It Fl o Ar prefix_for_output 71Store ACPI tables from physical memory into files specified by 72.Ar prefix_for_output . 73The files generated will 74be of the form <prefix>.<sig>.<id>. 75.Dq sig 76is the signature of the ACPI Table; 77.Dq id 78is unique for each table. 79.Pp 80The following are common table signatures (there may be others): 81RSDP, FACP, DSDT, SSDT, HPET, MCFG, SPMI, APIC, SPCR, SRAT, XSDT. 82.El 83.Pp 84When 85.Nm 86is invoked with no options, it will search ACPI tables from physical 87memory via a special file 88.Pa /dev/mem 89and dump them. 90First, it searches Root System Description Pointer, 91that has a signature 92.Qq RSD PTR\ \& , 93and then gets RSDT 94(Root System Description Table), 95which includes a list of pointers to physical memory addresses 96for other tables. 97RSDT itself and all other tables linked from RSDT are generically 98called SDT 99(System Description Table) 100and their header has the common format which consists of items 101such as Signature, Length, Revision, Checksum, OEMID, OEM Table ID, 102OEM Revision, Creator ID, and Creator Revision. 103.Nm 104dumps the contents of these SDTs. 105For further information about the formats of each table, 106see chapter 5: ACPI Software Programming Model, 107.Dq Advanced Configuration and Power Interface Specification Revision 1.0b 108from Intel/Microsoft/Toshiba. 109.Pp 110There is always a pointer to a physical memory address in RSDT for FACP 111(Fixed ACPI Description Table). 112FACP defines static system information about power management support 113(ACPI Hardware Register Implementation) 114such as interrupt mode 115(INT_MODEL), 116SCI interrupt number, SMI command port 117(SMI_CMD), 118and the location of ACPI registers. 119FACP also has a pointer to a physical memory address for DSDT, 120which includes information used on the kernel side such as 121PnP, power management support, and so on. 122While the other tables are described in a fixed format, 123DSDT consists of AML data which is compiled from sources 124written in free formatted ASL, a description language for ACPI. 125When 126.Nm 127outputs DSDT, it disassembles the AML data and 128translates them into ASL. 129.Sh FILES 130.Bl -tag -width /dev/mem 131.It Pa /dev/mem 132.El 133.Sh SEE ALSO 134.\" .Xr acpi 4 , 135.Xr mem 4 136.\" .Xr acpiconf 8 , 137.\" Xr amldb 8 138.Rs 139.%T Advanced Configuration and Power Interface Specification 140.%A Intel 141.%A Microsoft 142.%A Toshiba 143.%R Revision 1.0b 144.Re 145.Sh HISTORY 146The 147.Nm 148command first appeared in 149.Ox 3.8 . 150.Sh AUTHORS 151.An Doug Rabson Aq dfr@FreeBSD.org 152.An Mitsuru IWASAKI Aq iwasaki@FreeBSD.org 153.An Yasuo YOKOYAMA Aq yokoyama@jp.FreeBSD.org 154.Pp 155Some contributions made by: 156.An Chitoshi Ohsawa Aq ohsawa@catv1.ccn-net.ne.jp , 157.An Takayasu IWANASHI Aq takayasu@wendy.a.perfect-liberty.or.jp , 158.An Yoshihiko SARUMARU Aq mistral@imasy.or.jp , 159.An Hiroki Sato Aq hrs@FreeBSD.org , 160.An Jordan Hargrave Aq jordan@openbsd.org 161and 162.An Michael Lucas Aq mwlucas@blackhelicopters.org . 163.Sh BUGS 164In the current implementation, 165.Nm 166doesn't dump any information of Firmware ACPI Control Structure 167(FACS) 168specified by a pointer in FACP. 169