On Fri, Jul 11, 2003 at 04:23:45PM +0200, Juergen Beisert wrote: > I want to speed up some data copy in my Linux driver and so I want to use the > dcbz-instruction. > I get the memory with a kmalloc()-call with GFP_KERNEL argument. After that I > call a small assembler routine that uses dcbz to set this memory to zero. I > am shure this memory starts at 32 byte boundary and ends at another 32 byte > boundary. But if I call the dcbz-instruction I get an alignment exception. > I have tried to test the "Write Trough" and "Caching Inhibit" bits for this > TLB, but I'm not shure that I have found the right one. I have called > get_pteptr() with the kmalloc() returned virtual address. Is this the right > way to get informations about this TLB? The returned value seems ok (caching > enabled and write back, if Linux uses the same bit positions like the 405GP > manual). > With caching enabled and write back the dcbz-instruction should work (that's > what I have read in the manual). Right?
Why are you not calling memset on this region instead? -- Tom Rini http://gate.crashing.org/~trini/ ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
