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authorPaul Mundt <lethal@linux-sh.org>2009-03-17 17:49:49 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-03-17 17:49:49 +0900
commit8263a67e169fdf0d06d172acbf6c03ae172a69d4 (patch)
treecdfefd2d72c7854101287a9e39e3ad97cad6cb5b /arch/sh/Kconfig
parentda78800632197ac12adcdefbf09991d82adb8201 (diff)
downloadlwn-8263a67e169fdf0d06d172acbf6c03ae172a69d4.tar.gz
lwn-8263a67e169fdf0d06d172acbf6c03ae172a69d4.zip
sh: Support for extended ASIDs on PTEAEX-capable SH-X3 cores.
This adds support for extended ASIDs (up to 16-bits) on newer SH-X3 cores that implement the PTAEX register and respective functionality. Presently only the 65nm SH7786 (90nm only supports legacy 8-bit ASIDs). The main change is in how the PTE is written out when loading the entry in to the TLB, as well as in how the TLB entry is selectively flushed. While SH-X2 extended mode splits out the memory-mapped U and I-TLB data arrays for extra bits, extended ASID mode splits out the address arrays. While we don't use the memory-mapped data array access, the address array accesses are necessary for selective TLB flushes, so these are implemented newly and replace the generic SH-4 implementation. With this, TLB flushes in switch_mm() are almost non-existent on newer parts. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/Kconfig')
-rw-r--r--arch/sh/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index a0c879d17fd6..6c56495fd158 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -365,6 +365,7 @@ config CPU_SUBTYPE_SH7786
bool "Support SH7786 processor"
select CPU_SH4A
select CPU_SHX3
+ select CPU_HAS_PTEAEX
select ARCH_SPARSEMEM_ENABLE
select SYS_SUPPORTS_NUMA