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| author | Paul Mundt | 2008-11-12 04:53:48 +0100 |
|---|---|---|
| committer | Paul Mundt | 2008-11-12 04:53:48 +0100 |
| commit | 185aed75570fb4f78ef283dfa26cd9da5fa06a91 (patch) | |
| tree | a98cb3f46bf9426f8d4a660d63b8a3ac7d9f369d /arch/sh/kernel/early_printk.c | |
| parent | usb: r8a66597-hcd: fix wrong data access in SuperH on-chip USB (diff) | |
| download | kernel-qcow2-linux-185aed75570fb4f78ef283dfa26cd9da5fa06a91.tar.gz kernel-qcow2-linux-185aed75570fb4f78ef283dfa26cd9da5fa06a91.tar.xz kernel-qcow2-linux-185aed75570fb4f78ef283dfa26cd9da5fa06a91.zip | |
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>
Diffstat (limited to 'arch/sh/kernel/early_printk.c')
0 files changed, 0 insertions, 0 deletions