[Qemu-devel] [RFC PATCH v2 1/9] hw/sysbus: add helpers to register FDT aliases

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/hw/sysbus-fdt.h | 18 ++++++++++++++++++
 hw/core/sysbus-fdt.c    | 30 ++++++++++++++++++++++++++++++
 hw/core/Makefile.objs   |  1 +
 3 files changed, 49 insertions(+)
 create mode 100644 include/hw/sysbus-fdt.h
 create mode 100644 hw/core/sysbus-fdt.c

diff --git a/include/hw/sysbus-fdt.h b/include/hw/sysbus-fdt.h
new file mode 100644
index 0000000000..21f42dbbad
--- /dev/null
+++ b/include/hw/sysbus-fdt.h
@@ -0,0 +1,18 @@
+/*
+ * Flattened Device Tree alias helpers
+ *
+ * Copyright (C) 2018 Philippe Mathieu-Daudé <f4bug@amsat.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+#ifndef HW_SYSBUS_FDT_H
+#define HW_SYSBUS_FDT_H
+
+void type_register_fdt_alias(const char *name, const char *alias);
+void type_register_fdt_aliases(const char *name, const char **aliases);
+
+const char *type_resolve_fdt_alias(const char *alias);
+
+#endif /* HW_SYSBUS_FDT_H */
diff --git a/hw/core/sysbus-fdt.c b/hw/core/sysbus-fdt.c
new file mode 100644
index 0000000000..0d817ba230
--- /dev/null
+++ b/hw/core/sysbus-fdt.c
@@ -0,0 +1,30 @@
+#include "qemu/osdep.h"
+#include "hw/sysbus-fdt.h"
+
+static GHashTable *fdt_aliases(void)
+{
+    static GHashTable *fdt_aliases_singleton;
+
+    if (!fdt_aliases_singleton) {
+        fdt_aliases_singleton = g_hash_table_new(g_str_hash, g_str_equal);
+    }
+    return fdt_aliases_singleton;
+}
+
+void type_register_fdt_alias(const char *name, const char *alias)
+{
+    g_hash_table_insert(fdt_aliases(), (gpointer)name, (gpointer)name);
+    g_hash_table_insert(fdt_aliases(), (gpointer)alias, (gpointer)name);
+}
+
+void type_register_fdt_aliases(const char *name, const char **aliases)
+{
+    for (; *aliases; aliases++) {
+        type_register_fdt_alias(name, *aliases);
+    }
+}
+
+const char *type_resolve_fdt_alias(const char *alias)
+{
+    return g_hash_table_lookup(fdt_aliases(), alias);
+}
diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index f8d7a4aaed..f56f0755a5 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -11,6 +11,7 @@ common-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o
 common-obj-$(CONFIG_XILINX_AXI) += stream.o
 common-obj-$(CONFIG_PTIMER) += ptimer.o
 common-obj-$(CONFIG_SOFTMMU) += sysbus.o
+common-obj-$(CONFIG_SOFTMMU) += sysbus-fdt.o
 common-obj-$(CONFIG_SOFTMMU) += machine.o
 common-obj-$(CONFIG_SOFTMMU) += loader.o
 common-obj-$(CONFIG_FITLOADER) += loader-fit.o
-- 
2.15.1