Segmentation in Hardware

  • x86 Processors operate in either protected or real mode
    • Real mode: Backwards compatibility mode
    • Protected mode: All user programs need to use system calls to get access to resources
  • Real mode allows a process to directly address memory and has RAM limited to 1MB.  This is used for example when emulating 8086 programs directly

 

https://pdos.csail.mit.edu/6.828/2010/readings/i386/s05_01.htm contains some pretty good pictures of a translation

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s