[lkml]   [1996]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectVirtual/physical/bus accesses (was pre 2.1, AHA1542 fixes)
On Thu, 26 Sep 1996, Linus Torvalds wrote:
> [snip]
> So when the CPU wants any bus master to write to physical memory 0, it
> has to give the master address 0x80000000 as the memory address.
> [snip]

Interesting (as in "May you live in interesting times" :). I can see
one problem here, the need to distinguish between address 0 meaning
"byte 0" and address 0 meaning "no data present". Does not affect x86
because both map to bus 0, but might be a problem for other systems.
Could result in a situation where 0 != NULL.

 \ /
  Last update: 2005-03-22 13:37    [W:0.065 / U:0.788 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site