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ACPIDUMP(8)               BSD System Manager's Manual              ACPIDUMP(8)

     acpidump -- dump ACPI tables and ASL

     acpidump [-d] [-t] [-h] [-v] [-f dsdt_input] [-o dsdt_output]

     The acpidump utility analyzes ACPI tables in physical memory and can dump
     them to a file.  In addition, acpidump can call iasl(8) to disassemble
     AML (ACPI Machine Language) found in these tables and dump them as ASL
     (ACPI Source Language) to stdout.

     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.  The acpidump utility can extract
     the DSDT data block from physical memory and store it into an output file
     and optionally also disassemble it.  If any Secondary System Description
     Table (SSDT) entries exist, they will also be included in the output file
     and disassembly.

     When acpidump is invoked without the -f option, it will read ACPI tables
     from physical memory via /dev/mem.  First it searches for the RSDP (Root
     System Description Pointer), which has the signature "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.  When invoked with the
     -t flag, the acpidump utility dumps contents of the following tables:

           RSD PTR

     The RSDT contains a pointer to the physical memory address of the FACP
     (Fixed ACPI Description Table).  The FACP defines static system informa-
     tion about power management support (ACPI Hardware Register Implementa-
     tion) such as interrupt mode (INT_MODEL), SCI interrupt number, SMI com-
     mand port (SMI_CMD) and the location of ACPI registers.  The FACP also
     has a pointer to a physical memory address for the DSDT.  While the other
     tables are fixed format, the DSDT consists of free-formatted AML data.

     The following options are supported by acpidump:

     -d      Disassemble the DSDT into ASL using iasl(8) and print the results
             to stdout.

     -t      Dump the contents of the various fixed tables listed above.

     -h      Displays usage and exit.

     -v      Enable verbose messages.

     -f dsdt_input
             Load the DSDT from the specified file instead of physical memory.
             Since only the DSDT is stored in the file, the -t flag may not be
             used with this option.

     -o dsdt_output
             Store the DSDT data block from physical memory into the specified

     This example dumps the DSDT from physical memory to foo.dsdt.  It also
     prints the contents of various system tables and disassembles the AML
     contained in the DSDT to stdout, redirecting the output to foo.asl.

           # acpidump -t -d -o foo.dsdt > foo.asl

     This example reads a DSDT file and disassembles it to stdout.  Verbose
     messages are enabled.

           # acpidump -v -d -f foo.dsdt

     The current implementation does not dump the BOOT structure or other mis-
     cellaneous tables.


     acpi(4), mem(4), acpiconf(8), acpidb(8), iasl(8)

     Doug Rabson <dfrATFreeBSD.org>
     Mitsuru IWASAKI <iwasakiATFreeBSD.org>
     Yasuo YOKOYAMA <yokoyamaATjp.org>
     Nate Lawson <njlATFreeBSD.org>

     Some contributions made by Chitoshi Ohsawa <ohsawaATcatv1.jp>,
     Takayasu IWANASHI <takayasuATwendy.jp>, Yoshihiko
     SARUMARU <mistralATimasy.jp>, Hiroki Sato <hrsATFreeBSD.org>, Michael
     Lucas <mwlucasATblackhelicopters.org> and Michael Smith

     The acpidump utility first appeared in FreeBSD 5.0 and was rewritten to
     use iasl(8) for FreeBSD 5.2.

BSD                             October 4, 2004                            BSD