ACPI Overview
ACPI Overview
ACPI Overview
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>ACPI</strong> <strong>Overview</strong><br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
Contents<br />
Power Management History<br />
<strong>ACPI</strong><br />
<strong>ACPI</strong> States and Software<br />
Components<br />
<strong>ACPI</strong> History<br />
Changing <strong>ACPI</strong><br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
Power Management History<br />
Advanced Power Management (APM)<br />
✟<br />
✟<br />
✟<br />
✟<br />
✟<br />
✟<br />
✟<br />
BIOS-based system power management<br />
Provides CPU and device power management<br />
Called when idle - provides CPU power mgt.<br />
Uses device activity timeouts to determine when to<br />
transition devices into low power states<br />
OS has no knowledge of what APM does<br />
Each IBV must refine and maintain APM BIOS<br />
code/IP<br />
Wide variety of implementations and functionality<br />
No uniform user experience<br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
<strong>ACPI</strong><br />
Advanced Configuration and Power Interface<br />
✟<br />
ile hitecture<br />
b<br />
Conceived by Intel, Microsoft, and Toshiba (the<br />
promoters)<br />
An “interface”specification<br />
✟<br />
<strong>ACPI</strong>/OSPM replaces APM, MPS, and PnP BIOS Spec<br />
Allow OS-directed Power Management (OSPM)<br />
Defines<br />
✟<br />
✟<br />
✟<br />
✟<br />
Hardware registers - implemented in chipset silicon<br />
BIOS interfaces<br />
Configuration tables<br />
Interpreted executable function interface (Control Methods)<br />
Motherboard device enumeration and configuration<br />
System and device power states<br />
<strong>ACPI</strong> Thermal Model<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
<strong>ACPI</strong> Global States and<br />
Transitions<br />
Legacy<br />
Boot<br />
(SCI_EN=0)<br />
G3 -Mech<br />
Off<br />
Power<br />
Failure<br />
<strong>ACPI</strong><br />
Boot<br />
(SCI_EN=1)<br />
Modem HDD<br />
D3 D3 D3<br />
D2 D2 D2<br />
D1 D1 D1<br />
D0 D0 D0<br />
C0<br />
CDROM<br />
C0<br />
CPU<br />
C3<br />
C2<br />
C1<br />
Legacy<br />
Legacy<br />
Boot<br />
(SCI_EN=0)<br />
ile hitecture<br />
b<br />
<strong>ACPI</strong>_ENABLE<br />
(SCI_EN=1)<br />
<strong>ACPI</strong>_DISABLE<br />
(SCI_EN=0)<br />
G2 (S5) -<br />
Soft Off<br />
<strong>ACPI</strong><br />
Boot<br />
(SCI_EN=1)<br />
SLP_TYPx=S<br />
5<br />
and<br />
SLP_EN<br />
or<br />
PWRBTN_OR<br />
G0 (S0) -<br />
Working<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.<br />
S4BIOS_F<br />
S4BIOS_REQ<br />
SLP_TYPx=(S1-S4)<br />
and<br />
SLP_EN<br />
Wake<br />
Event<br />
BIOS<br />
Routin<br />
S4<br />
S3<br />
S2<br />
S1<br />
G1 -<br />
Sleeping
An <strong>ACPI</strong> System<br />
User Interface<br />
Operating System<br />
Policy<br />
Manager<br />
Device<br />
Drivers<br />
<strong>ACPI</strong><br />
Subsystem<br />
<strong>ACPI</strong>-<br />
Related<br />
Hardware /<br />
<strong>ACPI</strong> BIOS<br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
<strong>ACPI</strong> Software Components<br />
<strong>ACPI</strong> Subsystem<br />
✟<br />
✟<br />
Consumes <strong>ACPI</strong> BIOS<br />
Interacts with <strong>ACPI</strong> Hardware<br />
Policy Manager (OSPM)<br />
✟<br />
✟<br />
Sets and Monitors System Policies<br />
User Interface<br />
Allows User Input to Policy<br />
Device Drivers<br />
✟<br />
EC, SM Bus, CM Battery, Smart Battery<br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
<strong>ACPI</strong> System <strong>Overview</strong><br />
Applications<br />
Kernel<br />
OS<br />
Dependent<br />
Application<br />
APIs<br />
OSPM System Code<br />
Device<br />
Driver<br />
<strong>ACPI</strong> Driver/<br />
AML Interpreter<br />
OS Specific<br />
technologies,<br />
interfaces, and code.<br />
Existing<br />
industry<br />
standard<br />
register<br />
interfaces to:<br />
CMOS, PIC,<br />
PITs, ...<br />
<strong>ACPI</strong><br />
Register<br />
Interface<br />
<strong>ACPI</strong> Registers<br />
<strong>ACPI</strong> BIOS<br />
Interface<br />
<strong>ACPI</strong> BIOS<br />
<strong>ACPI</strong> Table<br />
Interface<br />
<strong>ACPI</strong> Tables<br />
OS<br />
Independent<br />
technologies,<br />
interfaces,<br />
code, and<br />
hardware.<br />
ile hitecture<br />
b<br />
- <strong>ACPI</strong> Spec Covers this area.<br />
- OS specific technology<br />
Platform Hardware<br />
- Hardware/Platform<br />
- Provided by <strong>ACPI</strong> CA<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.<br />
BIOS
<strong>ACPI</strong> Specification History<br />
<strong>ACPI</strong> 1.0 released December 1996<br />
<strong>ACPI</strong> 1.0a released July 1998<br />
<strong>ACPI</strong> 1.0b released February 1999<br />
<strong>ACPI</strong> 2.0 released July 2000<br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
How does <strong>ACPI</strong> change<br />
Periodic errata meetings held with promoters<br />
Either spec is updated (e.g. 1.0a, 1.0B, etc) or a<br />
errata document is posted on the <strong>ACPI</strong> site:<br />
http://www.acpi<br />
acpi.info<br />
ile hitecture<br />
b<br />
Note: Third Party Brands and Trademarks are Property of Their Respective Owners.
Change language