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acpidump - dump ACPI tables and ASL

 

NAME

      acpidump - dump ACPI tables and ASL
 

SYNOPSIS

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

DESCRIPTION

      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:
 
            DSDT
            ECDT
            FACS
            FADT
            HPET
            MADT
            MCFG
            RSD PTR
            RSDT
 
      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.
 

OPTIONS

      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
              file.
 

FILES

      /dev/mem
 

EXAMPLES

      If a developer requests a copy of your ASL, please use the following com‐
      mand to dump all tables and compress the result.
 
            # acpidump -dt | gzip -c9 > my_computer.asl.gz
 
      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
      acpi(4), mem(4), acpiconf(8), acpidb(8), iasl(8)
 

HISTORY

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

AUTHORS

      Doug Rabson 〈dfr@FreeBSD.org〉
      Mitsuru IWASAKI 〈iwasaki@FreeBSD.org〉
      Yasuo YOKOYAMA 〈yokoyama@jp.FreeBSD.org〉
      Nate Lawson 〈njl@FreeBSD.org〉
 
      Some contributions made by Chitoshi Ohsawa 〈ohsawa@catv1.ccn-net.ne.jp〉,
      Takayasu IWANASHI 〈takayasu@wendy.a.perfect-liberty.or.jp〉, Yoshihiko
      SARUMARU 〈mistral@imasy.or.jp〉, Hiroki Sato 〈hrs@FreeBSD.org〉, Michael
      Lucas 〈mwlucas@blackhelicopters.org〉 and Michael Smith
      〈msmith@FreeBSD.org〉.
 

BUGS

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

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.