sh: delay slot future proofing via EXPMASK on SH-4A parts.

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This implements EXPMASK initialization code for SH-4A parts, where it is
possible to disable compat features that will go away in newer cores.
Presently this includes disabling support for non-nop instructions in the
rte delay slot, as well as a sleep instruction being placed in a delay
slot (neither of which the kernel does any longer). As a result of this,
any future offenders will have illegal slot exceptions generated for
them.

Associative writes for the memory-mapped cache array are still left
enabled, until such a point that special cache operations for SH-4A are
provided to move off of the current (and rather dated) SH-4 versions.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

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Paul Mundt 2009-08-15 07:43:21 +09:00

parent 7a90e00dda

commit 7dd6662a92

1 changed files with 33 additions and 1 deletions

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arch/sh/kernel/cpu/init.c

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