Mike
>
> FreeBSD provides a more complete mechanism for getting virtual mappings
> of device physical apertures, and you should use it.
>
> > No actually it would the other way around: VM_PAGE_TO_PHYS.
> > But you have to get the vm_page of the virtual address first.
> > Perhaps pmap_extract(pmap, va) might be more helpful
> > but you will need the pmap of the process.
>
> Typically, in non-PCI, non-PNP cases you would use pmap_mapdev().
He was looking for virtual to physical mapping rather than allocation.
pmap_mapdev allocates:
/*
* Map a set of physical memory pages into the kernel virtual
* address space. Return a pointer to where it is mapped. This
* routine is intended to be used for mapping device memory,
* NOT real memory. The non-cacheable bits are set on each
* mapped page.
*/
But in any case, he should hit the books.
Chris
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