minios: grant table map (gntdev) for minios

I've implemented a grant map for mini-os to support the xc_gnttab_*()
functions, the equivalent of gntdev in linux. This is useful for my
work in putting xenstored in a stub domain.

Signed-off-by: Diego Ongaro <diego.ongaro@citrix.com>

2 files changed, 38 insertions, 0 deletions

diff --git a/extras/mini-os/include/gntmap.h b/extras/mini-os/include/gntmap.h
new file mode 100644
index 0000000000..fde53f39b1
--- /dev/null
+++ b/extras/mini-os/include/gntmap.h
@@ -0,0 +1,35 @@
+#ifndef __GNTMAP_H__
+#define __GNTMAP_H__
+
+#include <os.h>
+
+/*
+ * Please consider struct gntmap opaque. If instead you choose to disregard
+ * this message, I insist that you keep an eye out for raptors.
+ */
+struct gntmap {
+    int nentries;
+    struct gntmap_entry *entries;
+};
+
+int
+gntmap_set_max_grants(struct gntmap *map, int count);
+
+int
+gntmap_munmap(struct gntmap *map, unsigned long start_address, int count);
+
+void*
+gntmap_map_grant_refs(struct gntmap *map, 
+                      uint32_t count,
+                      uint32_t *domids,
+                      int domids_stride,
+                      uint32_t *refs,
+                      int writable);
+
+void
+gntmap_init(struct gntmap *map);
+
+void
+gntmap_fini(struct gntmap *map);
+
+#endif /* !__GNTMAP_H__ */
diff --git a/extras/mini-os/include/lib.h b/extras/mini-os/include/lib.h
index b508c38f51..8822dd14a7 100644
--- a/extras/mini-os/include/lib.h
+++ b/extras/mini-os/include/lib.h
@@ -59,6 +59,7 @@
 #include <stddef.h>
 #include <xen/xen.h>
 #include <xen/event_channel.h>
+#include "gntmap.h"
 
 #ifdef HAVE_LIBC
 #include <stdio.h>
@@ -138,6 +139,7 @@ enum fd_type {
     FTYPE_XENBUS,
     FTYPE_XC,
     FTYPE_EVTCHN,
+    FTYPE_GNTMAP,
     FTYPE_SOCKET,
     FTYPE_TAP,
     FTYPE_BLK,
@@ -168,6 +170,7 @@ extern struct file {
                 int bound;
             } ports[MAX_EVTCHN_PORTS];
 	} evtchn;
+	struct gntmap gntmap;
 	struct {
 	    struct netfront_dev *dev;
 	} tap;