K 10
svn:author
V 6
grehan
K 8
svn:date
V 27
2005-11-11T05:21:08.000000Z
K 7
svn:log
V 381
MFC locore.S:r.1.22, ofw_machdep.c:1.14

>  Copy SPRG0-3 registers at boot-time and restore when calling into
>  OpenFirmware. FreeBSD/ppc uses SPRG0 as the per-cpu data area pointer,
>  and SPRG1-3 as temporary registers during exception handling. There
>  have been a few instances where OpenFirmware does require these to
>  be part of it's context, such as cd-booting an eMac.

END