Revision: 14002
http://edk2.svn.sourceforge.net/edk2/?rev=14002&view=rev
Author: jljusten
Date: 2012-12-17 02:13:00 +0000 (Mon, 17 Dec 2012)
Log Message:
-----------
OvmfPkg: report S3 state in DSDT
The ACPI 5.0 specification says:
7.3.4.4 System \_S3 State
[...]
* Dynamic RAM context is maintained.
[...]
This corresponds to the following in the PIIX4 spec:
PMCNTRL -- POWER MANAGEMENT CONTROL REGISTER (IO)
[...]
Bits[12:10] Suspend Type
[...]
001 STR (Suspend To RAM)
Also, this (ie. decimal 1) is the suspend type value that qemu recognizes
as an S3 (suspend to ram) request.
Only the value for PM1a_CNT.SLP_TYP is set (PM1b_CNT.SLP_TYP is left at
zero), since in OVMF we don't report the optional PM1b_EVT_BLK register
block to OSPM. (PM1b_EVT_BLK is defined as 0 in "Platform.h"; see "4.8.1.1
PM1 Event Registers" in the ACPI 5.0 specification.)
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Modified Paths:
--------------
trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl
Modified: trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl
===================================================================
--- trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl 2012-12-17 02:12:44 UTC (rev
14001)
+++ trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl 2012-12-17 02:13:00 UTC (rev
14002)
@@ -17,6 +17,7 @@
// System Sleep States
//
Name (\_S0, Package () {5, 0, 0, 0}) // Working
+ Name (\_S3, Package () {1, 0, 0, 0}) // Suspend to Ram (PIIX4: STR)
Name (\_S4, Package () {2, 0, 0, 0}) // Suspend to Disk (PIIX4: POSCL)
Name (\_S5, Package () {0, 0, 0, 0}) // Soft Off
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