[uml-devel] [patches] ptrace fix, x11 fb update, minor stuff.

["Steve Schmidtke" <steve_schmidtke@hotmail.com>]

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Gerd Knorr wrote:
>the X-Server wants IOPL access for some obscure
>reason, it shouldn't need that when running on top of a framebuffer
>device.  Anyone has an idea on that?

I looked into this a while ago.  What I found was that you have to add UML 
to the exclude ifdef in CheckGenericGA() from xfree86/common/xf86Bus.c, and 
also around all the iopl() and ioperm() exclude ifdefs in 
xfree86/os_support/linux/linux_video.c.

I think it doesn't hurt to add  Option "PciOsConfig"  to the ServerFlags 
section in the conf file.

I also remember making the attached guest kernel patch at one point 
(apologies for hand editing it).

It would be nice if someone would code up an Option "NoHwIO" or something to 
X that takes care of this, instead of the ifdef hell. :)

Hope that helps,

Steve Schmidtke


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diff *~ -Naur linux.orig/drivers/char/vt.c linux.new/drivers/char/vt.c
--- linux.orig/drivers/char/vt.c	Thu Nov 28 18:53:12 2002
+++ linux.new/drivers/char/vt.c		Sun Aug  1 13:44:36 2003
@@ -146,7 +146,13 @@

int _kbd_rate(struct kbd_repeat *rep)
{
+#if defined(__arch_um__)
+	/* if X finds that this succeeds, it won't try to bang on
+	 * the (non-existent) hardware directly */
+	return 0;
+#else
	return -EINVAL;
+#endif
}

void (*kd_mksound)(unsigned int hz, unsigned int ticks) = _kd_mksound;