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| author | Michal Januszewski <spock@gentoo.org> | 2007-10-16 12:28:26 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 20:43:13 +0400 |
| commit | 8bdb3a2d7df48b861972c4bfb58490853a228f51 (patch) | |
| tree | febc4fbe0fd90e4677fe7703350ce349ddbfc342 /include/video/Kbuild | |
| parent | cc54f46e39dff9891dd334ef158a238ff5a9ffd2 (diff) | |
| download | linux-8bdb3a2d7df48b861972c4bfb58490853a228f51.tar.xz | |
uvesafb: the driver core
uvesafb is an enhanced version of vesafb. It uses a userspace helper (v86d)
to execute calls to the x86 Video BIOS functions. The driver is not limited
to any specific arch and whether it works on a given arch or not depends on
that arch being supported by the userspace daemon. It has been tested on
x86_32 and x86_64.
A single BIOS call is represented by an instance of the uvesafb_ktask
structure. This structure contains a buffer, a completion struct and a
uvesafb_task substructure, containing the values of the x86 registers, a flags
field and a field indicating the length of the buffer. Whenever a BIOS call
is made in the driver, uvesafb_exec() builds a message using the uvesafb_task
substructure and the contents of the buffer. This message is then assigned a
random ack number and sent to the userspace daemon using the connector
interface.
The message's sequence number is used as an index for the uvfb_tasks array,
which provides a mapping from the messages coming from userspace to the
in-kernel uvesafb_ktask structs.
The userspace daemon performs the requested operation and sends a reply in the
form of a uvesafb_task struct and, optionally, a buffer. The seq and ack
numbers in the reply should be exactly the same as those in the request.
Each message from userspace is processed by uvesafb_cn_callback() and after
passing a few sanity checks leads to the completion of a BIOS call request.
Signed-off-by: Michal Januszewski <spock@gentoo.org>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Paulo Marques <pmarques@grupopie.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/video/Kbuild')
| -rw-r--r-- | include/video/Kbuild | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/video/Kbuild b/include/video/Kbuild index a14f9c045b8c..53a6c7310e61 100644 --- a/include/video/Kbuild +++ b/include/video/Kbuild @@ -1 +1 @@ -unifdef-y += sisfb.h +unifdef-y += sisfb.h uvesafb.h |