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Serenity Operating System
1/*
2 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/ACPI/Parser.h>
28#include <Kernel/CommandLine.h>
29#include <Kernel/Net/E1000NetworkAdapter.h>
30#include <Kernel/Net/RTL8139NetworkAdapter.h>
31#include <Kernel/PCI/IOAccess.h>
32#include <Kernel/PCI/Initializer.h>
33#include <Kernel/PCI/MMIOAccess.h>
34#include <LibBareMetal/IO.h>
35
36namespace Kernel {
37namespace PCI {
38
39static bool test_pci_io();
40
41static Access::Type detect_optimal_access_type(bool mmio_allowed)
42{
43 if (mmio_allowed && ACPI::is_enabled() && !ACPI::Parser::the()->find_table("MCFG").is_null())
44 return Access::Type::MMIO;
45
46 if (test_pci_io())
47 return Access::Type::IO;
48
49 klog() << "No PCI bus access method detected!";
50 hang();
51}
52
53void initialize()
54{
55 bool mmio_allowed = kernel_command_line().lookup("pci_mmio").value_or("off") == "on";
56
57 if (detect_optimal_access_type(mmio_allowed) == Access::Type::MMIO)
58 MMIOAccess::initialize(ACPI::Parser::the()->find_table("MCFG"));
59 else
60 IOAccess::initialize();
61
62 enumerate_all([&](const Address& address, ID id) {
63 klog() << address << " " << id;
64 E1000NetworkAdapter::detect(address);
65 RTL8139NetworkAdapter::detect(address);
66 });
67}
68
69bool test_pci_io()
70{
71 klog() << "Testing PCI via manual probing... ";
72 u32 tmp = 0x80000000;
73 IO::out32(PCI_ADDRESS_PORT, tmp);
74 tmp = IO::in32(PCI_ADDRESS_PORT);
75 if (tmp == 0x80000000) {
76 klog() << "PCI IO Supported!";
77 return true;
78 }
79
80 klog() << "PCI IO Not Supported!";
81 return false;
82}
83
84}
85}