Simon Burge wrote:

> Jason R Thorpe wrote:
> 
> > On Wed, Jun 21, 2000 at 03:47:25PM +1000, Simon Burge wrote:
> > 
> >  > I've got a program that's basically:
> >  > 
> >  > 	u_int32_t vgaIObase;
> >  > 
> >  > 	alpha_pci_io_enable(1);
> >  > 	vgaIOBase = (inb(0x3cc) & 0x01) ? 0x3D0 : 0x3B0;
> >  > 
> >  > and it does roughly:
> >  > 
> >  > 	mmap(size = 0x40000000, addr = 0x8580000000) = 0x1603ec000
> >  > 	alpha_pci_io_swiz: abw->abw_addr = 0x1603ec000
> >  > 	alpha_pci_io_swiz: port = 0x1603f3980
> >  > 	alpha_pci_io_swiz_inb: return (*port && 0xff);
> >  > 
> >  > and at the last line the machine hangs hard and needs a reset.
> > 
> > hm.  That's ... odd.  The swizzle code in libalpha certainly appears to
> > have done the correct thing.  I guess the only issue is if mmap mapped
> > the correct pages underneath that user VA.
> 
> Didn't think of checking that.  I'll check it out.

I'm not a native ddb driver, but looked sorta ok to me.  Ten finger
copy:

ddb> ps/a
 ...
ddb> show map/f 0xfffffc0005cfcdf0
 ...
 - 0xfffffc0004d67208: 0x1603ec000->0x1e05ec000: obj = 0xfffffe000005d700/0x8580000000
 submap=F, cow=F, nc=F, prot(max)=3/7, inh=0, wc=0, adv=1
ddb> show obj/f 0xfffffe000005d700
 OBJECT 0xfffffe000005d700: locked=0, pgops=0xfffffe0000576860, npages=0, refs=1
   PAGES <pg,offset>
ddb>

(Can you get ddb to save the outputs of commands in the message buffer?)

The 0x8580000000 is the address being mmap'd by alpha_bus_mapwindow().

Simon.