# Copyright (C) 2020-2022 The opuntiaOS Project Authors.
#  + Contributed by Nikita Melekhin <nimelehin@gmail.com>
# 
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

from construct import *

DEVTREE_HEADER_SIGNATURE = "odtr3"

DEVTREE_HEADER = Struct(
    "signature" / PaddedString(8, "ascii"),
    "revision" / Int32ul,
    "flags" / Int32ul,
    "entries_count" / Int32ul,
    "name_list_offset" / Int32ul
)

DEVTREE_ENTRY_FLAGS_MMIO = (1 << 0)
DEVTREE_ENTRY_TYPE_IO = 0
DEVTREE_ENTRY_TYPE_FB = 1
DEVTREE_ENTRY_TYPE_UART = 2
DEVTREE_ENTRY_TYPE_RAM = 3
DEVTREE_ENTRY_TYPE_STORAGE = 4
DEVTREE_ENTRY_TYPE_BUS_CONTROLLER = 5

DEVTREE_ENTRY = Struct(
    "type" / Int32ul,
    "flags" / Int32ul,
    "paddr" / Int32ul,
    "rel_name_offset" / Int32ul,
)