Use fast in-situ test for gate A20 being set, to cut down on the
authorMichael Brown <mcb30@etherboot.org>
Fri, 13 Jul 2007 12:32:49 +0000 (13:32 +0100)
committerMichael Brown <mcb30@etherboot.org>
Fri, 13 Jul 2007 12:32:49 +0000 (13:32 +0100)
commit57b5e227ffd4949bf6e92443be2cb2da71046c60
treee80b2d00a97dca1973dfd757a98cdf1852302f9e
parent096fa94f0c62f5cd813f35bd229f2c6f003e92c3
Use fast in-situ test for gate A20 being set, to cut down on the
number of (potentially very slow) gateA20_set operations.

Die with a fatal error if we are unable to set gate A20; if this fails
then we are bound to experience memory corruption at a later stage,
and I'd prefer to pick it up early.
src/arch/i386/firmware/pcbios/gateA20.c