rust: Introduce iosys_map bindings

This introduces a set of bindings for working with iosys_map in rust code.
The design of this is heavily based off the design for both the io and
dma_map bindings for Rust.

Signed-off-by: Lyude Paul <lyude@redhat.com>

Author: Lyude

rust/helpers/helpers.c

@@ -31,6 +31,7 @@
 #include "irq.c"
 #include "fs.c"
 #include "io.c"
+#include "iosys_map.c"
 #include "jump_label.c"
 #include "kunit.c"
 #include "maple_tree.c"

rust/helpers/iosys_map.c

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/iosys-map.h>
+
+void rust_helper_iosys_map_memcpy_to(struct iosys_map *dst, size_t dst_offset,
+				     const void *src, size_t len)
+{
+	iosys_map_memcpy_to(dst, dst_offset, src, len);
+}
+
+void rust_helper_iosys_map_memcpy_from(void *dst, const struct iosys_map *src,
+				       size_t src_offset, size_t len)
+{
+	iosys_map_memcpy_from(dst, src, src_offset, len);
+}