Eric Anholt wrote: > On Fri, 2007-05-04 at 13:13 -0700, Nate Lawson wrote: >> I have a desktop with i945GMS builtin video. It appears agp_i810.c is >> not built on amd64, hence no support for agp. This is on 6.x. >> >> none0_at_pci0:2:0: class=0x030000 card=0x31031565 chip=0x27728086 rev=0x02 >> hdr=0x00 >> vendor = 'Intel Corporation' >> device = 'Integrated Graphics Controller' >> class = display >> subclass = VGA >> >> sys/conf/files.i386:pci/agp_i810.c optional agp >> >> $ ls /sys/amd64/compile/SMP/*agp* >> /sys/amd64/compile/SMP/agp.o /sys/amd64/compile/SMP/agp_if.h >> /sys/amd64/compile/SMP/agp_amd64.o /sys/amd64/compile/SMP/agp_if.o >> /sys/amd64/compile/SMP/agp_if.c /sys/amd64/compile/SMP/agp_intel.o >> >> Is there any reason not to use i810 on amd64? A quick glance through >> doesn't show it doing anything 32-bit specific. On -current, it appears >> to be enabled for amd64. It appears this MFC never happened: >> >> revision 1.93 >> date: 2006/09/05 16:55:12; author: anholt; state: Exp; lines: +1 -0 >> Include agp_i810.c in amd64 AGP builds to get support for the Intel 915 >> Express chipsets. > > Nope, there's no good reason for the MFC to have not happened. > > We've only got one amd64 issue that I know of, but it's actually not > unique to amd64. We're not allocating our pages to back aperture > allocations to meet the requirements of the page tables, so for example > on i915-class hardware with 4GB of ram, you'll get pages sometimes that > are above the 4GB range, and we'll just drop the top bit of the address > when filling in the page table, resulting in pain. We need a way for > AGP drivers to communicate their requirements for AGP memory to the > core, likely through busdma tags. > > In the current agp_i810.c patch I've been working on, I at least panic > when we get out-of-range pages, instead of scribbling on random memory. > Ok, I've tested it and it works. I will MFC now. -- NateReceived on Fri May 04 2007 - 20:04:12 UTC
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