tree a98cb3f46bf9426f8d4a660d63b8a3ac7d9f369d
parent ade7a9b4ccd20ab8159c77a0abd20552f2d6b06c
author Paul Mundt <lethal@linux-sh.org> 1226462028 +0900
committer Paul Mundt <lethal@linux-sh.org> 1226462028 +0900

sh: Provide a sane valid_phys_addr_range() to prevent TLB reset with PMB.

With the PMB enabled, only P1SEG and up are covered by the PMB mappings,
meaning that situations where out-of-bounds physical addresses are read
from will lead to TLB reset after the PMB miss, allowing for use cases
like dd if=/dev/mem to reset the TLB.

Fix this up to make sure the reference is between __MEMORY_START (phys)
and __pa(high_memory). This is coherent across all variants of sh/sh64
with and without MMU, though the PMB bug itself is only applicable to
SH-4A parts.

Reported-by: Hideo Saito <saito@densan.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>