1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libdisk/change.c b/lib/libdisk/change.c
new file mode 100644
index 0000000..6a506f8
--- /dev/null
+++ b/lib/libdisk/change.c
@@ -0,0 +1,82 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * $FreeBSD$
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <err.h>
+#include <sys/types.h>
+#include "libdisk.h"
+
+void
+Set_Bios_Geom(struct disk *disk, u_long cyl, u_long hd, u_long sect)
+{
+	disk->bios_cyl = cyl;
+	disk->bios_hd = hd;
+	disk->bios_sect = sect;
+	Bios_Limit_Chunk(disk->chunks,1024*hd*sect);
+}
+
+void
+Sanitize_Bios_Geom(struct disk *disk)
+{
+	int sane = 1;
+
+	if (disk->bios_cyl > 1024)
+		sane = 0;
+	if (disk->bios_hd > 16)
+		sane = 0;
+	if (disk->bios_sect > 63)
+		sane = 0;
+	if (disk->bios_cyl*disk->bios_hd*disk->bios_sect != 
+	    disk->chunks->size)
+		sane = 0;
+	if (sane)
+		return;
+
+	/* First try something that IDE can handle */
+	disk->bios_sect = 63;
+	disk->bios_hd = 16;
+	disk->bios_cyl = disk->chunks->size/(disk->bios_sect*disk->bios_hd);
+
+	if (disk->bios_cyl < 1024)
+		return;
+
+	/* Hmm, try harder... */
+	disk->bios_hd = 255;
+	disk->bios_cyl = disk->chunks->size/(disk->bios_sect*disk->bios_hd);
+
+	return;
+}
+
+void
+All_FreeBSD(struct disk *d, int force_all)
+{
+	struct chunk *c;
+
+    again:
+	for (c=d->chunks->part;c;c=c->next)
+		if (c->type != unused) {
+			Delete_Chunk(d,c);
+			goto again;
+		}
+	c=d->chunks;
+	if (force_all) {
+		Sanitize_Bios_Geom(d);
+		Create_Chunk(d,c->offset,c->size,freebsd,0xa5,
+		     CHUNK_FORCE_ALL);
+	} else {
+		Create_Chunk(d,c->offset,c->size,freebsd,0xa5, 0);
+	}
+}