[POWERPC] Add DSCR SPR to sysfs
POWER6 adds a new SPR, the data stream control register (DSCR). It can be used to adjust how agressive the prefetch mechanisms are. Its possible we may want to context switch this, but for now just export it to userspace via sysfs so we can adjust it. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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