« Previous | Next » 

Revision 4333979e

ID4333979e3d8c129953bba36ed87ce543d33cbea1

Added by Anthony Liguori over 12 years ago

pc: make vgabios exit port more useful

We've always listened on port 501 for vgabios panic messages. In the entire
time I've worked on QEMU, I've never actually seen a vgabios panic message :-)

If we change the semantics of this port a little bit, it makes it possible to
use it for more interesting use-cases. I chose this approach instead of adding
a new I/O port because it avoids having a guest visible change.

This change allows single-byte access to port 501 and also uses the value
written to construct an exit code.

Signed-off-by: Anthony Liguori <>

Files

  • added
  • modified
  • copied
  • renamed
  • deleted

View differences