PowerPC kernel bug.

James Simmons (jsimmons@edgeglobal.com)
Mon, 13 Dec 1999 22:03:26 -0500 (EST)

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This message is toward the Fbdev/kernel group to fix this bug but I wanted
to let the GLX group what caused the memset problem on PowerPC. On a
PowerPC when you mmap the framebuffer and use memset on the mmapped
image you get a SIGBUS. Thanks Marcus for finding out what was causing the
problem.

>I noticed today that it's actually a bug in the PPC-kernel. The
>specification for the dcbz (data cache block zero) instruction
>states that for uncached memory the exception handler should clear
>the memory, but on Linux it just causes a SIGBUS to be sent to the
>app...

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