rt-thread-official/components/drivers/ofw/libfdt/fdt.h

/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
#ifndef FDT_H
#define FDT_H
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
 */

#ifndef __ASSEMBLY__

struct fdt_header {
    fdt32_t magic;           /* magic word FDT_MAGIC */
    fdt32_t totalsize;       /* total size of DT block */
    fdt32_t off_dt_struct;       /* offset to structure */
    fdt32_t off_dt_strings;      /* offset to strings */
    fdt32_t off_mem_rsvmap;      /* offset to memory reserve map */
    fdt32_t version;         /* format version */
    fdt32_t last_comp_version;   /* last compatible version */

    /* version 2 fields below */
    fdt32_t boot_cpuid_phys;     /* Which physical CPU id we're
                        booting on */
    /* version 3 fields below */
    fdt32_t size_dt_strings;     /* size of the strings block */

    /* version 17 fields below */
    fdt32_t size_dt_struct;      /* size of the structure block */
};

struct fdt_reserve_entry {
    fdt64_t address;
    fdt64_t size;
};

struct fdt_node_header {
    fdt32_t tag;
    char name[];
};

struct fdt_property {
    fdt32_t tag;
    fdt32_t len;
    fdt32_t nameoff;
    char data[];
};

#endif /* !__ASSEMBLY */

#define FDT_MAGIC   0xd00dfeed  /* 4: version, 4: total size */
#define FDT_TAGSIZE sizeof(fdt32_t)

#define FDT_BEGIN_NODE  0x1     /* Start node: full name */
#define FDT_END_NODE    0x2     /* End node */
#define FDT_PROP    0x3     /* Property: name off,
                       size, content */
#define FDT_NOP     0x4     /* nop */
#define FDT_END     0x9

#define FDT_V1_SIZE (7*sizeof(fdt32_t))
#define FDT_V2_SIZE (FDT_V1_SIZE + sizeof(fdt32_t))
#define FDT_V3_SIZE (FDT_V2_SIZE + sizeof(fdt32_t))
#define FDT_V16_SIZE    FDT_V3_SIZE
#define FDT_V17_SIZE    (FDT_V16_SIZE + sizeof(fdt32_t))

#endif /* FDT_H */