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| author | Matthew Garrett <mjg@redhat.com> | 2012-01-31 19:19:20 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-03-30 10:09:24 +0200 |
| commit | d1ff4b1cdbabb9ab9813f3d6e1cbec42cc5d6ed8 (patch) | |
| tree | 19a0a4440742bce34e1da3ffcc5377acaf22896a /Documentation | |
| parent | ACPI: export acpi_kobj (diff) | |
| download | linux-d1ff4b1cdbabb9ab9813f3d6e1cbec42cc5d6ed8.tar.xz linux-d1ff4b1cdbabb9ab9813f3d6e1cbec42cc5d6ed8.zip | |
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-acpi | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi index 4f9ba3c2fca7..dd930c8db41f 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> |