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Not to be confused with [[APIC]].
Not to be confused with [[APIC]]. The second worst type of coder in the world is the kind that [http://geekz.co.uk/lovesraymond/archive/so-i-married-a-kernel-programmer shows up with a bloody shovel]. The worst kind is a [http://dankamongmen.livejournal.com/#entry_298962 BIOS coder]. Upwards and onwards to ACPI, a creation of the [http://www.acpi.info/ Advanced Configuration and Power Interface] group.


The second worst type of coder in the world is the kind that [http://geekz.co.uk/lovesraymond/archive/so-i-married-a-kernel-programmer shows up with a bloody shovel]. The worst kind is a BIOS coder. This tradition has been proudly maintained by a Purple Sash Society of BIOS programmers ("enumerators", "scribes", whatever), primarily illiterate folk from Alberta and [http://dankamongmen.livejournal.com/#entry_298962 Thailand]. Anyway, on to ACPI, a creation of the [http://www.acpi.info/ Advanced Configuration and Power Interface] group.
==Specifications==
As of September 2019, the current version of ACPI is Revision 6.3, published January 2019. It is now published as part of the [[UEFI]] standards, and administered by the UEFI Forum.
* [https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf ACPI 6.3] specification


==acpidump/acpixtract==
<tt>acpidump</tt> differs subtly and annoyingly between [[Debian]] and [[FreeBSD]].
<tt>acpidump</tt> differs subtly and annoyingly between [[Debian]] and [[FreeBSD]].
<pre>[recombinator](0) $ sudo acpidump  -o recombinator.acpi  
<pre>[recombinator](0) $ sudo acpidump  -o recombinator.acpi  
Line 49: Line 52:
[recombinator](0) $</pre>
[recombinator](0) $</pre>


==Specifications==
==DSDT==
The current version is 3.0, amended as 3.0a. Version 4.0 is under development.
Differentiated System Description Tables.
* [http://www.acpi.info/spec30a.htm ACPI 3.0a] specification
<pre>
* [http://www.acpi.info/spec30.htm ACPI 3.0] specification
[recombinator](0) $ sudo acpidump -t DSDT -b -o acpidump.dsdt
[recombinator](0) $ iasl -d acpidump.dsdt
 
Intel ACPI Component Architecture
AML Disassembler version 20061109 [Mar 19 2009]
Copyright (C) 2000 - 2006 Intel Corporation
Supports ACPI Specification Revision 3.0a
 
Loading Acpi table from file acpidump.dsdt
Acpi table [DSDT] successfully installed and loaded
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
..................................................... etc
Parsing completed
Disassembly completed, written to "acpidump.dsl"
[recombinator](0) $ </pre>
===Rebuilding a decompiled DSDT===
<pre>[recombinator](0) $ iasl -tc acpidump.dsl
 
Intel ACPI Component Architecture
ASL Optimizing Compiler version 20061109 [Mar 19 2009]
Copyright (C) 2000 - 2006 Intel Corporation
Supports ACPI Specification Revision 3.0a
 
acpidump.dsl  2186:                    Acquire (MUT0, 0x0FFF)
Warning  1103 -        Possible operator timeout is ignored ^
 
ASL Input:  acpidump.dsl - 5185 lines, 178349 bytes, 1615 keywords
AML Output: acpidump.aml - 15771 bytes 546 named objects 1069 executable opcodes
 
Compilation complete. 0 Errors, 1 Warnings, 0 Remarks, 597 Optimizations
[recombinator](0) $ </pre>
 
==SRAT==
[http://lwn.net/Articles/7177/ Linux in 2009] gained support for parsing of the BIOS-provided SRAT table ([http://mail-index.netbsd.org/port-amd64/2009/11/23/msg001026.html NetBSD also had support] by later that year). The SRAT describes memory and processor topology, and the hot-pluggable status of all.
* Use the CONFIG_X86_64_ACPI_NUMA kernel option to enable SRAT-based enumeration of [[NUMA]].
 
==See also==
* [http://www.lesswatts.org/projects/acpi/ Linux ACPI] page at http://www.lesswatts.org/projects/acpi/
* Legacy info regarding [http://acpi.sourceforge.net/dsdt/index.php Linux DSDT] replacement
* Intel's [http://www.intel.com/technology/IAPC/acpi/ ACPI] page, including <tt>iasl</tt>.
* The MADT table can be used to discover [[SMP on x86|SMP]] topology
[[Category: x86]]