I see that throughout the kernel source, internal PPC registers are
accessed through [in|out]_be[32|16|8]() functions. However, they are
translated into 3 inline assembly instructions, one of which is an
isync, which has a huge performance hit.
I tried using readl_be() which seems to be the right function according
to the Documentation/ dir, but it is translated directly to in_be32(),
so no luck.
Is it really necessary to use all those instructions? I know I could use
a (volatile u32 *) variable to avoid subsequent read/writes to be
optimized out, but it seems to be a deprecated use.
Thank you in advance,
Matteo
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