abuf: Provide a constant buffer
Add a new initialiser which can accept a constant pointer.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/abuf.h b/include/abuf.h
index de21cef..62ff649 100644
--- a/include/abuf.h
+++ b/include/abuf.h
@@ -158,6 +158,19 @@
void abuf_init_set(struct abuf *abuf, void *data, size_t size);
/**
+ * abuf_init_const() - Set up a new const abuf
+ *
+ * Inits a new abuf and sets up its (unallocated) data. The only current
+ * difference between this and abuf_init_set() is the 'data' parameter is a
+ * const pointer. At some point a flag could be used to indicate const-ness.
+ *
+ * @abuf: abuf to set up
+ * @data: New contents of abuf
+ * @size: New size of abuf
+ */
+void abuf_init_const(struct abuf *abuf, const void *data, size_t size);
+
+/**
* abuf_uninit() - Free any memory used by an abuf
*
* The buffer must be inited before this can be called.
diff --git a/lib/abuf.c b/lib/abuf.c
index 8156177..61adf7f 100644
--- a/lib/abuf.c
+++ b/lib/abuf.c
@@ -119,6 +119,12 @@
abuf_set(abuf, data, size);
}
+void abuf_init_const(struct abuf *abuf, const void *data, size_t size)
+{
+ /* for now there is no flag indicating that the abuf data is constant */
+ abuf_init_set(abuf, (void *)data, size);
+}
+
void abuf_init_move(struct abuf *abuf, void *data, size_t size)
{
abuf_init_set(abuf, data, size);
diff --git a/test/lib/abuf.c b/test/lib/abuf.c
index 5d61f92..b38690f 100644
--- a/test/lib/abuf.c
+++ b/test/lib/abuf.c
@@ -46,6 +46,28 @@
}
LIB_TEST(lib_test_abuf_set, 0);
+/* Test abuf_init_const() */
+static int lib_test_abuf_init_const(struct unit_test_state *uts)
+{
+ struct abuf buf;
+ ulong start;
+ void *ptr;
+
+ start = ut_check_free();
+
+ ptr = map_sysmem(0x100, 0);
+
+ abuf_init_const(&buf, ptr, 10);
+ ut_asserteq_ptr(ptr, buf.data);
+ ut_asserteq(10, buf.size);
+
+ /* No memory should have been allocated */
+ ut_assertok(ut_check_delta(start));
+
+ return 0;
+}
+LIB_TEST(lib_test_abuf_init_const, 0);
+
/* Test abuf_map_sysmem() and abuf_addr() */
static int lib_test_abuf_map_sysmem(struct unit_test_state *uts)
{