On Mon, Jul 31, 2000 at 10:36:43AM -0500, daniel sheltraw wrote:
> Hello RTAIers
>
> It looks like rthal is defined in the modified irq.c. When I try to
> install a new SVAGlib I get a error that rthal is undefined which halts the
> install. Why isn't rthal defined in a header file which
> one could then #include in an include file of any new software
> to be installed?
>
> Daniel
You are running into a number of problems:
1. Your distribution uses symlinks from /usr/include/{linux|asm} to
/usr/src/linux/include/{linux|asm}. This is wrong. Keep in mind
that this has been wrong for about 5 years, but everyone *thinks*
it is right because Red Hat does it.
2. SVGAlib assumes that kernel header files are acceptable for
compiling a user-space program and/or library. This is also
wrong. Notably, compiling SVGAlib against an SMP kernel will
cause similar problems with undefined __global_cli and friends.
3. SVGAlib uses cli() in user-space. This is borderline stupid
on SVGAlib's part. Unfortunately, due to the design of SVGAlib,
this is required. (Borderline stupid == can cause lockups.)
Anyway, what is wrong with using the SVGAlib binary that is
packaged with your distribution? It will cause higher latency
for real-time interrupts (because of cli() in user-space), but
it works.
Also, there are options other than SVGAlib, including using GGI,
KGI, kernel framebuffer, or (my personal favorite) a stripped-down
X server.
dave...
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