NAME
acpidump —
dump ACPI tables and
ASL
SYNOPSIS
acpidump |
[-cdhstv]
[-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:
- APIC
-
- BERT
-
- BOOT
-
- CPEP
-
- DBG2
-
- DBGP
-
- DMAR
-
- DSDT
-
- ECDT
-
- EINJ
-
- ERST
-
- FACS
-
- FADT
-
- HEST
-
- HPET
-
- MADT
-
- MCFG
-
- MSCT
-
- NFIT
-
- RSD PTR
-
- RSDT
-
- SBST
-
- SLIT
-
- SPCR
-
- SPMI
-
- SRAT
-
- TCPA
-
- UEFI
-
- WAET
-
- WDAT
-
- WDDT
-
- WDRT
-
The RSDT contains a pointer to the physical memory address of the 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 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:
-
-
- -c
- Dump unknown table data as characters instead of hex.
-
-
- -d
- Disassemble the DSDT into ASL using
iasl(8) and print the results
to stdout.
-
-
- -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.
-
-
- -h
- Displays usage and exit.
-
-
- -o
dsdt_output
- Store the DSDT data block from physical memory into the
specified file.
-
-
- -s
- Skip tables with bad checksums.
-
-
- -t
- Dump the contents of the various fixed tables listed
above.
-
-
- -v
- Enable verbose messages.
FILES
-
-
- /dev/mem
-
EXAMPLES
If a developer requests a copy of your ASL, please use the following command 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
SEE ALSO
acpi(4),
amldb(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 some miscellaneous tables.