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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/PCI/IOAccess.h>
28#include <LibBareMetal/IO.h>
29
30namespace Kernel {
31namespace PCI {
32
33void IOAccess::initialize()
34{
35 if (!Access::is_initialized())
36 new IOAccess();
37}
38
39IOAccess::IOAccess()
40{
41 klog() << "PCI: Using I/O instructions for PCI configuration space access";
42}
43
44u8 IOAccess::read8_field(Address address, u32 field)
45{
46 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
47 return IO::in8(PCI_VALUE_PORT + (field & 3));
48}
49
50u16 IOAccess::read16_field(Address address, u32 field)
51{
52 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
53 return IO::in16(PCI_VALUE_PORT + (field & 2));
54}
55
56u32 IOAccess::read32_field(Address address, u32 field)
57{
58 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
59 return IO::in32(PCI_VALUE_PORT);
60}
61
62void IOAccess::write8_field(Address address, u32 field, u8 value)
63{
64 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
65 IO::out8(PCI_VALUE_PORT + (field & 3), value);
66}
67void IOAccess::write16_field(Address address, u32 field, u16 value)
68{
69 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
70 IO::out16(PCI_VALUE_PORT + (field & 2), value);
71}
72void IOAccess::write32_field(Address address, u32 field, u32 value)
73{
74 IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
75 IO::out32(PCI_VALUE_PORT, value);
76}
77
78void IOAccess::enumerate_all(Function<void(Address, ID)>& callback)
79{
80 // Single PCI host controller.
81 if ((read8_field(Address(), PCI_HEADER_TYPE) & 0x80) == 0) {
82 enumerate_bus(-1, 0, callback);
83 return;
84 }
85
86 // Multiple PCI host controllers.
87 for (u8 function = 0; function < 8; ++function) {
88 if (read16_field(Address(0, 0, 0, function), PCI_VENDOR_ID) == PCI_NONE)
89 break;
90 enumerate_bus(-1, function, callback);
91 }
92}
93
94}
95}