Date: Tue, 5 Sep 2006 14:46:35 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-ia32@freebsd.org Cc: Bharath Bhushan <bharath.bhushan@gmail.com> Subject: Re: io apic question Message-ID: <200609051446.36261.jhb@freebsd.org> In-Reply-To: <29683db20609012326i351eb455ja3b0aade681c7773@mail.gmail.com> References: <29683db20609012326i351eb455ja3b0aade681c7773@mail.gmail.com>
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On Saturday 02 September 2006 02:26, Bharath Bhushan wrote: > I am looking at 4.9 sources. > > When the local apic is mapped into SMPpt in > sys/i386/i386/pmap.c:pmap_bootstrap(), it is mapped cache-disabled > (PG_N). > > When the IO apics are being mapped into SMPpt in > sys/i386/i386/mp_machdep.c:mptable_pass2(), it is *not* mapped > cache-disabled. > > Why is this difference? Probably a bug. > In 5.5, I see that ioapic_create() calls pmap_createdev(), which > allocates cache-enabled kind of mapping. > > Am I missing something here? In 7.0 we map them cache-disabled now. -- John Baldwin
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