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http://en.wikipedia.org/wiki/ARM_architecture

ARM740T is actually V4T, and reading of control register should be OK.
Although I guess due to historic reason, it's using armv3_* prefix for
the functions?

> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mrc =C2=A0 =C2=A0 =
p15, 0, r0, c1, c0, 0 =C2=A0 @ read control reg
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0@ .... .... .... WC.M
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0orr =C2=A0 =C2=A0 =
r0, r0, #0x000d =C2=A0 =C2=A0 =C2=A0 =C2=A0 @ .... .... .... 11.1
> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* ?? this overwrites =
the value constructed above? */
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mov =C2=A0 =C2=A0 =
r0, #0

This does seem to be an error.

> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mcr =C2=A0 =C2=A0 =
p15, 0, r0, c1, c0, 0 =C2=A0 @ write control reg
>
> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* ?? invalidate for t=
he second time? */
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mcr =C2=A0 =C2=A0 =
p15, 0, r0, c7, c0, 0 =C2=A0 @ invalidate whole cache v3
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mov =C2=A0 =C2=A0 =
pc, lr
>
> --
> 1.7.1
>
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