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authorLeif Lindholm <leif.lindholm@arm.com>2010-09-16 18:00:47 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-11-04 15:45:24 +0000
commit64d2dc384e41e2b7acead6804593ddaaf8aad8e1 (patch)
tree07f6e34981bd4a6642cdffb546b32a2a973aec5d /drivers/Makefile
parent247055aa21ffef1c49dd64710d5e94c2aee19b58 (diff)
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ARM: 6396/1: Add SWP/SWPB emulation for ARMv7 processors
The SWP instruction was deprecated in the ARMv6 architecture, superseded by the LDREX/STREX family of instructions for load-linked/store-conditional operations. The ARMv7 multiprocessing extensions mandate that SWP/SWPB instructions are treated as undefined from reset, with the ability to enable them through the System Control Register SW bit. This patch adds the alternative solution to emulate the SWP and SWPB instructions using LDREX/STREX sequences, and log statistics to /proc/cpu/swp_emulation. To correctly deal with copy-on-write, it also modifies cpu_v7_set_pte_ext to change the mappings to priviliged RO when user RO. Signed-off-by: Leif Lindholm <leif.lindholm@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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