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Serenity Operating System
1/*
2 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
3 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this
10 * list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <Kernel/ACPI/DynamicParser.h>
29#include <Kernel/CommandLine.h>
30
31namespace Kernel {
32namespace ACPI {
33
34enum class FeatureLevel {
35 Enabled,
36 Limited,
37 Disabled,
38};
39
40static FeatureLevel determine_feature_level()
41{
42 auto value = kernel_command_line().lookup("acpi").value_or("on");
43 if (value == "limited")
44 return FeatureLevel::Limited;
45 if (value == "off")
46 return FeatureLevel::Disabled;
47 return FeatureLevel::Enabled;
48}
49
50void initialize()
51{
52 auto feature_level = determine_feature_level();
53 if (feature_level == FeatureLevel::Disabled)
54 return;
55
56 auto rsdp = StaticParsing::find_rsdp();
57 if (rsdp.is_null())
58 return;
59
60 if (feature_level == FeatureLevel::Enabled)
61 Parser::initialize<DynamicParser>(rsdp);
62 else
63 Parser::initialize<Parser>(rsdp);
64}
65
66bool is_enabled()
67{
68 return Parser::the();
69}
70
71}
72}