On 09-Jun-2003 cd_freebsd wrote: > [EMAIL PROTECTED] writes > >>> You may also want to consider pmap_map. It depends on what your >>requirements >>> are? > > while Bruce M Simpson [EMAIL PROTECTED] writes > >>>It's quite evil and not machine independent..avoid. > > -Who is right? (I like Juli's answer and she has FreeBSD.org in her name :) ) > -Why is pmap_mapdev bad? > -What makes it machine dependent? > -What is the difference between pmap_devmap and pmap_map? > > My requirements would be to map some or all of the following memory areas that are > not associated > with any device I own: > 1) BIOS & UMB ram (0xC0000-0xFFFFF) > 2) VGA Video buffer (0xA0000-0xBFFFF)
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. > 3) Video Frame buffer (0x????0000-0x????0000) Since this is not real RAM but device memory, pmap_mapdev() is ok for this. -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
