Move the PC98 specific geometry "gunk" to geom_pc98.c where it belongs.

This also adds support for bigger disks on the controller I have access to,
and maybe others if I understood the adhoc methods used on those.

Those with more PC98 bigdrive controllers it is hereby invited to add/fix
support for those in geom_pc98.c and not using #ifdef PC98 all over the place.

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/geom/geom_pc98.c b/sys/geom/geom_pc98.c
index afbc59f..355e121 100644
--- a/sys/geom/geom_pc98.c
+++ b/sys/geom/geom_pc98.c
@@ -258,6 +258,25 @@ g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
 		sectorsize = cp->provider->sectorsize;
 		if (sectorsize < 512)
 			break;
+		if (cp->provider->mediasize/sectorsize < 17*8*65535) {
+			fwsectors = 17;
+			fwheads = 8;
+		}
+		else if (cp->provider->mediasize/sectorsize < 63*16*65535) {
+			if (fwsectors > 63)
+				fwsectors = 63;
+			if (fwheads > 16)
+				fwheads = 16;
+		}
+		else if (cp->provider->mediasize/sectorsize < 255*16*65535) {
+			fwsectors = 255;
+			if (fwheads > 16)
+				fwheads = 16;
+		}
+		else {
+			fwsectors = 255;
+			fwheads = 255;
+		}
 		buf = g_read_data(cp, 0, 8192, &error);
 		if (buf == NULL || error != 0)
 			break;