Mapping Physical Memory without a Device?

[John Baldwin]

On 09-Jun-2003 cd_freebsd wrote:
> John Baldwin <jhb at FreeBSD.org> wrote:
> 
>>> The first 1 meg of memory is 1:1 mapped at KERNBASE.  IOW, you can get to the BIOS at KERNBASE
>>> + 0xc0000.  That should cover these first two items.
> 
> Even on non-i386 machines? 

No, other machines don't have BIOSes. :)

> I guess it really doesn't matter since I am reading the BIOS area to detect that I am running on
> a specific type machine. The other calls are ignored if the data read does not equal the expected
> values.

Your code would have to be compiled to run on another arch anyways.  If
it is truly necessary, you can always use #ifdef __i386__ to determine
if you are running on an i386.

-- 

John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/