On Thursday, October 30, 2014 12:39:27 pm Sourish Mazumder wrote:
> Hi John,
>
> I want to make a block device out of this nvram memory. So, I will need to
> perform memcpy() operation into this memory.
> Do I need to add this memory into the vm system, if I need to do operations
> like memcpy().
Ah, so you just need to map it. The most expedient thing you can do for this
is:
void *p;
p = pmap_mapdev(physaddr, len);
(This uses an uncached mapping).
When you are finished (e.g during a detach routine if you need to unload the
driver) you can do:
pmap_unmapdev((vm_offset_t)p, len);
Note that for a PCI BAR you would do something different, but for a resource
you discover via the SMAP and is x86 specific this is ok.
--
John Baldwin
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