ACPI: Difference between revisions

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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.

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.

==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]].

<pre>[recombinator](0) $ sudo acpidump -o recombinator.acpi

Line 46:

Line 51:

Disassembly completed, written to "DSDT.dsl"

[recombinator](0) $</pre>

==DSDT==

Differentiated System Description Tables.

<pre>

[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]

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]

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]]

@@ Line 1: / Line 1: @@
-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.
+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.
+==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]].
 <pre>[recombinator](0) $ sudo acpidump  -o recombinator.acpi
@@ Line 46: / Line 51: @@
 Disassembly completed, written to "DSDT.dsl"
 [recombinator](0) $</pre>
+==DSDT==
+Differentiated System Description Tables.
+<pre>
+[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]]

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