[prefix] When we have to hook INT 19, chain to original handler if possible
authorMichael Brown <mcb30@etherboot.org>
Sat, 14 Jun 2008 12:49:26 +0000 (13:49 +0100)
committerMichael Brown <mcb30@etherboot.org>
Sat, 14 Jun 2008 12:49:26 +0000 (13:49 +0100)
commitcd0e9bcd221e6d779e99e51998f34253642d13a8
tree40ab0dd81cf2b95ebf8f248b9da7a3311d5d1d74
parenta71b4df1c9aa414b574e4d18eb12be8615a109fa
[prefix] When we have to hook INT 19, chain to original handler if possible

When the BIOS doesn't support BBS, hooking INT 19 is the only way to add
ourselves as a boot device.  If we have to do this, we should at least
try to chain to the original INT 19 vector if our boot fails.

Idea suggested by Andrew Schran <aschran@google.com>
src/arch/i386/prefix/romprefix.S