kernel/target/arm64/boot-shim/devicetree.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <zircon/compiler.h>
#include <stdint.h>

__BEGIN_CDECLS;

typedef struct dt_slice {
    uint8_t *data;
    uint32_t size;
} dt_slice_t;

struct devicetree_header {
    uint32_t magic;
    uint32_t size;
    uint32_t off_struct;        // offset from start to DT 'structure'
    uint32_t off_strings;       // offset from start to stringdata
    uint32_t off_reserve;       // offset from start to reserve memory map
    uint32_t version;
    uint32_t version_compat;    // last compatible version
    uint32_t boot_cpuid;
    uint32_t sz_strings;        // size of stringdata
    uint32_t sz_struct;         // size of DT 'structure'
};

typedef struct devicetree {
    dt_slice_t top;
    dt_slice_t dt;
    dt_slice_t ds;
    struct devicetree_header hdr;
    void (*error)(const char *msg);
} devicetree_t;

typedef int (*dt_node_cb)(int depth, const char *name, void *cookie);
typedef int (*dt_prop_cb)(const char *name, uint8_t *data, uint32_t size, void *cookie);

int dt_init(devicetree_t *dt, void *data, uint32_t len);
int dt_walk(devicetree_t *dt, dt_node_cb ncb, dt_prop_cb pcb, void *cookie);

uint32_t dt_rd32(uint8_t *data);
void dt_wr32(uint32_t n, uint8_t *data);

__END_CDECLS;