help:How to map a physical address into a kernel address?

[hongz at promisechina.com]

Hi guys:

 

To access sg_table in kernel address, I need to map the starting physical
address of a segment into a kernel address. As I know that, we can use
phystovirt()/bustovirt(), or kmap()/kmap_atomic() to map a bus/physical
address or a physical page into a kernel address in Linux, but I did not
find such a function in FreeBSD. Please help me on this, it is very urgent!

 

Thanks a lot!

 

Hong