Add accessor functions for iterating over segments. A segment

can be in bus address space, physical memory space or virtual
memory space.

2 files changed, 48 insertions, 0 deletions

diff --git a/tools/bus_space/C/lang.c b/tools/bus_space/C/lang.c
index bbb2bc7faa91..345957efdbe7 100644
--- a/tools/bus_space/C/lang.c
+++ b/tools/bus_space/C/lang.c
@@ -155,3 +155,40 @@ busdma_mem_free(busdma_md_t md)
 
 	return (bd_mem_free(md));
 }
+
+busdma_seg_t
+busdma_md_first_seg(busdma_md_t md, int space)
+{
+	busdma_seg_t seg;
+
+	seg = bd_md_first_seg(md, space);
+	return (seg);
+}
+
+busdma_seg_t
+busdma_md_next_seg(busdma_md_t md, busdma_seg_t seg)
+{
+ 
+	seg = bd_md_next_seg(md, seg);
+	return (seg);
+}
+
+bus_addr_t
+busdma_seg_get_addr(busdma_seg_t seg)
+{
+	u_long addr;
+	int error;
+
+	error = bd_seg_get_addr(seg, &addr);
+	return ((error) ? ~0UL : addr);
+}
+
+bus_size_t
+busdma_seg_get_size(busdma_seg_t seg)
+{
+	u_long size;
+	int error;
+
+	error = bd_seg_get_size(seg, &size);
+	return ((error) ? ~0UL : size);
+}
diff --git a/tools/bus_space/C/libbus.h b/tools/bus_space/C/libbus.h
index 357437246f8d..76ab40225145 100644
--- a/tools/bus_space/C/libbus.h
+++ b/tools/bus_space/C/libbus.h
@@ -43,6 +43,7 @@ typedef unsigned long bus_addr_t;
 typedef unsigned long bus_size_t;
 typedef int busdma_tag_t;
 typedef int busdma_md_t;
+typedef int busdma_seg_t;
 
 int	busdma_tag_create(const char *dev, bus_addr_t align, bus_addr_t bndry,
 	    bus_addr_t maxaddr, bus_size_t maxsz, u_int nsegs,
@@ -57,4 +58,14 @@ int	busdma_tag_destroy(busdma_tag_t tag);
 int	busdma_mem_alloc(busdma_tag_t tag, u_int flags, busdma_md_t *out_p);
 int	busdma_mem_free(busdma_md_t md);
 
+#define	BUSDMA_MD_BUS_SPACE	0
+#define	BUSDMA_MD_PHYS_SPACE	1
+#define	BUSDMA_MD_VIRT_SPACE	2
+
+int	busdma_md_first_seg(busdma_md_t, int space);
+int	busdma_md_next_seg(busdma_md_t, busdma_seg_t seg);
+
+bus_addr_t	busdma_seg_get_addr(busdma_seg_t seg);
+bus_size_t	busdma_seg_get_size(busdma_seg_t seg);
+
 #endif /* _LIBBUS_SPACE_H_ */