Date: Tue, 14 Apr 2009 09:01:25 -0500 (CDT) From: Mark Tinguely <tinguely@casselton.net> To: gballet@gmail.com, ticso@cicely.de Cc: freebsd-arm@freebsd.org, chuckr@telenix.org Subject: Re: Pandora Message-ID: <200904141401.n3EE1P92096194@casselton.net> In-Reply-To: <fd183dc60904140606y19cadc72t9027121e92a39f07@mail.gmail.com>
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The new Gumstix uses the Cortex OMAP processor as well. I sent Oliver a link to the start of the ARMv6 UP/SMP cpu_throw/cpu_switch and atomic code that is backward compatible and tested on pre-ARMv6; obviously not yet on ARMv6. In ARMv6 mode, the caches are not flushed on context change. ARMv6 UP and SMP have different caches: SMP does not use the pmap_fix_cache and the multiple KVA patch, and the ARMv6 UP and ARMv5 use a different definition of page sharing (ARMv6 uses page coloring), therefore the flushing circumstances change. In the patch that I sent to him, there are still some flushes to be removed from pmap.c. We will see; maybe ARMv5, ARMv6 UP and SMP should use a different pmap.c file. --Mark Tinguely
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