Re: Offtopic Posts [was Re: [OT] Memory Models and Multi/Virtual-Cores -- WAS: 4.0 -> 4.1 update failing]

[b.j.smith at ieee.org (Bryan J. Smith)]

On Tue, 2005-06-28 at 20:59 -0500, Bryan J. Smith wrote:
> The addressing is still 100% the same!  Even the addressing registers --
> 16-bit segment + 32-bit offset are the _same_!  There is just now an
> official memory model called "Long Mode" -- the segment register becomes
> bits 32-47.  In PAE36, the segment register is bits 4-36, which bits
> 4-31 being a "two's complement" with the offset register.

Ugh, I've gotta correct this massive _error_.

In PAE36, segment register = bits 20-35 (not 4-36 -- doh!), two's
complement with 20-31 (not 4-31 -- doh!), but bits 32-35 are _used_ for
up to 64GiB.

> Now that's just the "programmer" level.


-- 
Bryan J. Smith                                     b.j.smith@xxxxxxxx 
--------------------------------------------------------------------- 
It is mathematically impossible for someone who makes more than you
to be anything but richer than you.  Any tax rate that penalizes them
will also penalize you similarly (to those below you, and then below
them).  Linear algebra, let alone differential calculus or even ele-
mentary concepts of limits, is mutually exclusive with US journalism.
So forget even attempting to explain how tax cuts work.  ;->