On Thursday, June 03, 1999 10:07 AM, Alan Cox [SMTP:[EMAIL PROTECTED]] wrote:
: > : You then need a 386. 64K is the limit. The original work I did was designed
: > : to be easy to run in 286 protected mode once you got rid of any BIOS interfaces.
: > :
: > Remind me - what then is the benefit of protected mode? Merely
: > separate address spaces?
:
: You get two things in 286 protected mode
:
: 1. You take exceptions if you try and go out of your segments
: 2. You get 16Mbytes of addressable ram
:
:
So, basically, 286 protected mode still runs in 64k segments, and
in order to address the additional memory on a per-process basis we need
large code or large data segments through the compiler (far pointers). In this
way, larger programs can be written.
With bcc currently, there would be no benefit to the size of user programs
run, just more could be run on ELKS, since ELKS could allocate more physical
memory by allocating more DS descriptors covering physical memory...
In addition, the user programs could be protected from the kernel and vice
versa...
Right?
Greg
