Add support for device-tree-based drivers.

include/grub/fdt.h

@@ -20,6 +20,7 @@
 #define GRUB_FDT_HEADER	1
 
 #include <grub/types.h>
+#include <grub/symbol.h>
 
 #define FDT_MAGIC 0xD00DFEED
 
@@ -95,16 +96,22 @@ struct grub_fdt_empty_tree {
 #define grub_fdt_set_size_dt_struct(fdt, value)	\
 	grub_fdt_set_header(fdt, size_dt_struct, value)
 
-int grub_fdt_create_empty_tree (void *fdt, unsigned int size);
-int grub_fdt_check_header (void *fdt, unsigned int size);
-int grub_fdt_check_header_nosize (void *fdt);
-int grub_fdt_find_subnode (const void *fdt, unsigned int parentoffset,
-			   const char *name);
-int grub_fdt_add_subnode (void *fdt, unsigned int parentoffset,
+int EXPORT_FUNC(grub_fdt_create_empty_tree) (void *fdt, unsigned int size);
+int EXPORT_FUNC(grub_fdt_check_header) (const void *fdt, unsigned int size);
+int EXPORT_FUNC(grub_fdt_check_header_nosize) (const void *fdt);
+int EXPORT_FUNC(grub_fdt_find_subnode) (const void *fdt, unsigned int parentoffset,
+					const char *name);
+int EXPORT_FUNC(grub_fdt_first_node) (const void *fdt, unsigned int parentoffset);
+int EXPORT_FUNC(grub_fdt_next_node) (const void *fdt, unsigned int currentoffset);
+int EXPORT_FUNC(grub_fdt_add_subnode) (void *fdt, unsigned int parentoffset,
 			  const char *name);
+const char *
+EXPORT_FUNC(grub_fdt_get_nodename) (const void *fdt, unsigned int nodeoffset);
+const void *EXPORT_FUNC(grub_fdt_get_prop) (const void *fdt, unsigned int nodeoffset, const char *name,
+					    grub_uint32_t *len);
 
-int grub_fdt_set_prop (void *fdt, unsigned int nodeoffset, const char *name,
-		      const void *val, grub_uint32_t len);
+int EXPORT_FUNC(grub_fdt_set_prop) (void *fdt, unsigned int nodeoffset, const char *name,
+				    const void *val, grub_uint32_t len);
 #define grub_fdt_set_prop32(fdt, nodeoffset, name, val)	\
 ({ \
   grub_uint32_t _val = grub_cpu_to_be32(val); \

include/grub/fdtbus.h

@@ -0,0 +1,73 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2016  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_FDTBUS_HEADER
+#define GRUB_FDTBUS_HEADER	1
+
+#include <grub/fdt.h>
+#include <grub/err.h>
+
+struct grub_fdtbus_dev;
+
+struct grub_fdtbus_driver
+{
+  struct grub_fdtbus_driver *next;
+  struct grub_fdtbus_driver **prev;
+
+  const char *compatible;
+
+  grub_err_t (*attach) (const struct grub_fdtbus_dev *dev);
+  void (*detach) (const struct grub_fdtbus_dev *dev);
+};
+
+extern char EXPORT_VAR(grub_fdtbus_invalid_mapping)[1];
+
+static inline int
+grub_fdtbus_is_mapping_valid (volatile void *m)
+{
+  return m != grub_fdtbus_invalid_mapping;
+}
+
+volatile void *
+EXPORT_FUNC(grub_fdtbus_map_reg) (const struct grub_fdtbus_dev *dev, int reg, grub_size_t *size);
+
+const void *
+EXPORT_FUNC(grub_fdtbus_get_fdt) (void);
+
+const char *
+EXPORT_FUNC(grub_fdtbus_get_name) (const struct grub_fdtbus_dev *dev);
+
+const void *
+EXPORT_FUNC(grub_fdtbus_get_prop) (const struct grub_fdtbus_dev *dev,
+		      const char *name,
+		      grub_uint32_t *len);
+
+void
+EXPORT_FUNC(grub_fdtbus_register) (struct grub_fdtbus_driver *driver);
+
+void
+EXPORT_FUNC(grub_fdtbus_unregister) (struct grub_fdtbus_driver *driver);
+
+/* Must be called before any register(). */
+/* dtb is assumed to be unfreeable and must remain
+   valid for lifetime of GRUB.
+ */
+void
+grub_fdtbus_init (const void *dtb, grub_size_t size);
+
+#endif

include/grub/kernel.h

@@ -28,7 +28,8 @@ enum
   OBJ_TYPE_MEMDISK,
   OBJ_TYPE_CONFIG,
   OBJ_TYPE_PREFIX,
-  OBJ_TYPE_PUBKEY
+  OBJ_TYPE_PUBKEY,
+  OBJ_TYPE_DTB
 };
 
 /* The module header.  */

include/grub/util/install.h

@@ -176,7 +176,7 @@ grub_install_generate_image (const char *dir, const char *prefix,
 			     char *config_path,
 			     const struct grub_install_image_target_desc *image_target,
 			     int note,
-			     grub_compression_t comp);
+			     grub_compression_t comp, const char *dtb_file);
 
 const struct grub_install_image_target_desc *
 grub_install_get_image_target (const char *arg);