keii.dev
1/*
2 * Copyright (C) 2020-2022 The opuntiaOS Project Authors.
3 * + Contributed by Nikita Melekhin <nimelehin@gmail.com>
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#ifndef _BOOT_LIBBOOT_DEVTREE_DEVTREE_H
10#define _BOOT_LIBBOOT_DEVTREE_DEVTREE_H
11
12#include <libboot/mem/mem.h>
13#include <libboot/types.h>
14
15#define DEVTREE_HEADER_SIGNATURE ("odtr3")
16#define DEVTREE_HEADER_SIGNATURE_LEN (sizeof(DEVTREE_HEADER_SIGNATURE) - 1)
17
18struct PACKED devtree_header {
19 char signature[8];
20 uint32_t revision;
21 uint32_t flags;
22 uint32_t entries_count;
23 uint32_t name_list_offset;
24};
25typedef struct devtree_header devtree_header_t;
26
27#define DEVTREE_ENTRY_FLAGS_MMIO = (1 << 0)
28#define DEVTREE_ENTRY_TYPE_IO (0)
29#define DEVTREE_ENTRY_TYPE_FB (1)
30#define DEVTREE_ENTRY_TYPE_UART (2)
31#define DEVTREE_ENTRY_TYPE_RAM (3)
32#define DEVTREE_ENTRY_TYPE_STORAGE (4)
33#define DEVTREE_ENTRY_TYPE_BUS_CONTROLLER (5)
34
35struct PACKED devtree_entry {
36 uint32_t type;
37 uint32_t flags;
38 uint32_t paddr;
39 uint32_t rel_name_offset;
40};
41typedef struct devtree_entry devtree_entry_t;
42
43int devtree_init(void* devtree, size_t size);
44const char* devtree_name_of_entry(devtree_entry_t* en);
45devtree_entry_t* devtree_find_device(const char* name);
46void* devtree_start();
47size_t devtree_size();
48
49#endif // _BOOT_LIBBOOT_DEVTREE_DEVTREE_H