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#ifndef _IPXE_FDT_H
#define _IPXE_FDT_H
/** @file
*
* Flattened Device Tree
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
struct net_device;
/** Device tree header */
struct fdt_header {
/** Magic signature */
uint32_t magic;
/** Total size of device tree */
uint32_t totalsize;
/** Offset to structure block */
uint32_t off_dt_struct;
/** Offset to strings block */
uint32_t off_dt_strings;
/** Offset to memory reservation block */
uint32_t off_mem_rsvmap;
/** Version of this data structure */
uint32_t version;
/** Lowest version to which this structure is compatible */
uint32_t last_comp_version;
/** Physical ID of the boot CPU */
uint32_t boot_cpuid_phys;
/** Length of string block */
uint32_t size_dt_strings;
/** Length of structure block */
uint32_t size_dt_struct;
} __attribute__ (( packed ));
/** Magic signature */
#define FDT_MAGIC 0xd00dfeed
/** Expected device tree version */
#define FDT_VERSION 16
/** Device tree token */
typedef uint32_t fdt_token_t;
/** Begin node token */
#define FDT_BEGIN_NODE 0x00000001
/** End node token */
#define FDT_END_NODE 0x00000002
/** Property token */
#define FDT_PROP 0x00000003
/** Property fragment */
struct fdt_prop {
/** Data length */
uint32_t len;
/** Name offset */
uint32_t name_off;
} __attribute__ (( packed ));
/** NOP token */
#define FDT_NOP 0x00000004
/** End of structure block */
#define FDT_END 0x00000009
/** Alignment of structure block */
#define FDT_STRUCTURE_ALIGN ( sizeof ( fdt_token_t ) )
/** A device tree */
struct fdt {
/** Tree data */
union {
/** Tree header */
const struct fdt_header *hdr;
/** Raw data */
const void *raw;
};
/** Length of tree */
size_t len;
/** Offset to structure block */
unsigned int structure;
/** Length of structure block */
size_t structure_len;
/** Offset to strings block */
unsigned int strings;
/** Length of strings block */
size_t strings_len;
};
extern int fdt_path ( const char *path, unsigned int *offset );
extern int fdt_alias ( const char *name, unsigned int *offset );
extern const char * fdt_string ( unsigned int offset, const char *name );
extern int fdt_mac ( unsigned int offset, struct net_device *netdev );
extern int register_fdt ( const struct fdt_header *hdr );
#endif /* _IPXE_FDT_H */
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