xnu-1504.3.12.tar.gz

[apple/xnu.git] / osfmk / ipc / ipc_kmsg.h

diff --git a/osfmk/ipc/ipc_kmsg.h b/osfmk/ipc/ipc_kmsg.h
index db4df8ad5a68e7ad043c6b7261f4e20246c4e18d..8687cafbfb115f2cc88fa0822d289f2ff4eca82c 100644 (file)
--- a/osfmk/ipc/ipc_kmsg.h
+++ b/osfmk/ipc/ipc_kmsg.h
@@ -162,6 +162,12 @@ MACRO_BEGIN                                                                \
        assert((kmsg)->ikm_next == IKM_BOGUS);                          \
 MACRO_END
 
+#define ikm_set_header(kmsg, mtsize)                                   \
+MACRO_BEGIN                                                            \
+       (kmsg)->ikm_header = (mach_msg_header_t *)                      \
+       ((vm_offset_t)((kmsg) + 1) + (kmsg)->ikm_size - (mtsize));      \
+MACRO_END
+
 struct ipc_kmsg_queue {
        struct ipc_kmsg *ikmq_base;
 };
@@ -267,13 +273,16 @@ extern void ipc_kmsg_destroy(
 extern void ipc_kmsg_destroy_dest(
        ipc_kmsg_t      kmsg);
 
-
 /* Preallocate a kernel message buffer */
+extern ipc_kmsg_t ipc_kmsg_prealloc(
+       mach_msg_size_t size);
+
+/* bind a preallocated message buffer to a port */
 extern void ipc_kmsg_set_prealloc(
        ipc_kmsg_t      kmsg,
        ipc_port_t      port);
 
-/* Clear a kernel message buffer */
+/* Clear preallocated message buffer binding */
 extern void ipc_kmsg_clear_prealloc(
        ipc_kmsg_t      kmsg,
        ipc_port_t      port);