From owner-freebsd-hackers  Wed Oct 21 22:23:47 1998
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Date: Thu, 22 Oct 1998 01:22:21 -0400 (EDT)
From: Thomas Valentino Crimi <tcrimi+@andrew.cmu.edu>
To: freebsd-hackers@FreeBSD.ORG
Subject: pci_map_mem()
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  I'm working on a device driver and have been running into a bit of
vaugeness over the pci_map_mem interface.  From what I've gathered:

pci_map_mem(pci tag, reg, vaddr, paddr)
 
where reg is the base address register and vaddr and paddr will be set
to the address space allocated.  paddr would be the address of the page
boundary?

I wrote some code with these assuptions in mind which boiled down to this:

 if(!pci_map_mem(tag, 0x10, &va, &pa)) return;
 regbase = va + REG_OFFSET;

 regbase[REG10] = 0x03;

   That last operation dumped me into ddb ;)

 Where am I going wrong?  I'm under the assumption that a successful
pci_map_mem maps all the memory the card requests (so I shouldn't fall
off), and also makes that memory immediately accessible to me.

TIA 

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