ACPIDUMP(8) FreeBSD System Manager's Manual ACPIDUMP(8)
NAME
acpidump - dump ACPI tables and ASL
SYNOPSIS
acpidump [-d] [-f dsdt_input] [-h] [-o dsdt_output] [-t] [-T table_name]
[-v]
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 all
the ACPI tables, except the DSDT and SSDT. The following SDTs are
reported in detail, while the remainder will only report the common
header information:
BERT Boot Error Record Table
Reports any previous boot errors.
DMAR DMA Remapping Table
Contains information about the DMA remapping necessary for
the system for I/O virtualization on Intel CPUS.
DSDT Differentiated System Description Table
Contains the main AML for the system.
ECDT Embedded Controller Boot Resources Table
Contains information about accessing the embedded controller
prior to the OS decoding the DSDT for all its details.
EINJ Error Injection Table
Use to inject hardware errors to the error reporting
mechanisms.
ERST Error Record Serialization Table
Information to retrieve and manage errors reported from the
hardware.
FACS Firmware ACPI Control Structure
Information for the OS to interact with the firmware for
things like suspend / resume and prevent mutual access to
resources shared between the OS and the firmware.
FACP Fixed ACPI Description Table (FADT)
Information related to power management, and other CPU
related data.
HEST Hardware Error Source Table
Describes the possible sources of hardware errors to the OS.
HPET High Precision Event Timer Table
Describes the high precision timers in the system.
IVRS I/O Virtualization Reporting Structure
Information for hypvervisors to use to share I/O resources
on AMD processors.
LPIT Low Power Idle Table
Power management information for reducing power usage of the
system.
MADT Multiple APIC Description Table
Describes all the Advanced Programmable Interrupt
Controllers and Intel Streamlined Advanced Programmable
Interrupt Controller present in the system.
MCFG PCI Express Memory-mapped Configuration
PCI config space base address register.
NFIT NVDIMM Firmware Interface Table
NVDIMM information in the system.
RSD PTR
Pointer to the RSDT.
RSDT Root System Description Table
An array of physical pointers to other system description
tables, the FACP (Fixed ACPI Description Table).
SLIT System Locality Distance Information Table
Provides information about the cost of communicating between
different parts of the system (NUMA).
SPCR Serial Port Console Redirection
Contains informatiom about any serial port that the firmware
used as a reporting console.
SRAT System Resource Affinity Table
Defines the domains of locality in the system for
processors, memory and generic initiators (eg PCIe root
complexes).
TCPA Trusted Computing Platform Alliance
Information about the TPM elements of the system.
TPM2 Trusted Platform Module 2
Additional information about newer TPM hardware.
WDDT Watchdog Timer Description Table
Information about how to manage watchdog timers in the
system.
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:
-d Concatenate the DSDT and the SSDT's into single image and
disassemble the image into ASL using iasl(8) and print the
results to stdout.
-t Dump the contents of the various fixed tables listed above.
-T -ar -table_name
Dump the contents of the specific table. All ACPI tables are
exactly 4 characters long.
-h Displays usage and exit.
-s Disassemble each of the DSDT and the SSDT's into ASL using
iasl(8) and print the results to stdout. This will avoid iasl(8)
error on disassembling concatenated image. If both -d and -s are
specified, the last option is effective.
-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
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), 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
miscellaneous tables.
FreeBSD 15.1-STABLE-HBSD October 5, 2024 ACPIDUMP(8)