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authorMatthew Garrett <mjg@redhat.com>2012-01-31 13:19:20 -0500
committerLen Brown <len.brown@intel.com>2012-03-30 04:09:24 -0400
commitd1ff4b1cdbabb9ab9813f3d6e1cbec42cc5d6ed8 (patch)
tree19a0a4440742bce34e1da3ffcc5377acaf22896a /Documentation
parentf2d4753fbd4d15c65d6ba48167aa83916ddbe518 (diff)
downloadop-kernel-dev-d1ff4b1cdbabb9ab9813f3d6e1cbec42cc5d6ed8.zip
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ACPI: Add support for exposing BGRT data
ACPI 5.0 adds the BGRT, a table that contains a pointer to the firmware boot splash and associated metadata. This simple driver exposes it via /sys/firmware/acpi in order to allow bootsplash applications to draw their splash around the firmware image and reduce the number of jarring graphical transitions during boot. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-firmware-acpi20
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diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi
index 4f9ba3c..dd930c8 100644
--- a/Documentation/ABI/testing/sysfs-firmware-acpi
+++ b/Documentation/ABI/testing/sysfs-firmware-acpi
@@ -1,3 +1,23 @@
+What: /sys/firmware/acpi/bgrt/
+Date: January 2012
+Contact: Matthew Garrett <mjg@redhat.com>
+Description:
+ The BGRT is an ACPI 5.0 feature that allows the OS
+ to obtain a copy of the firmware boot splash and
+ some associated metadata. This is intended to be used
+ by boot splash applications in order to interact with
+ the firmware boot splash in order to avoid jarring
+ transitions.
+
+ image: The image bitmap. Currently a 32-bit BMP.
+ status: 1 if the image is valid, 0 if firmware invalidated it.
+ type: 0 indicates image is in BMP format.
+ version: The version of the BGRT. Currently 1.
+ xoffset: The number of pixels between the left of the screen
+ and the left edge of the image.
+ yoffset: The number of pixels between the top of the screen
+ and the top edge of the image.
+
What: /sys/firmware/acpi/interrupts/
Date: February 2008
Contact: Len Brown <lenb@kernel.org>
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