summaryrefslogtreecommitdiffstats
path: root/src/common/host_memory.h
blob: eaa7d18ab537faf076cd700910359a07ff1a233c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <memory>
#include "common/common_types.h"

namespace Common {

/**
 * A low level linear memory buffer, which supports multiple mappings
 * Its purpose is to rebuild a given sparse memory layout, including mirrors.
 */
class HostMemory {
public:
    explicit HostMemory(size_t backing_size_, size_t virtual_size_);
    ~HostMemory();

    /**
     * Copy constructors. They shall return a copy of the buffer without the mappings.
     * TODO: Implement them with COW if needed.
     */
    HostMemory(const HostMemory& other) = delete;
    HostMemory& operator=(const HostMemory& other) = delete;

    /**
     * Move constructors. They will move the buffer and the mappings to the new object.
     */
    HostMemory(HostMemory&& other) noexcept;
    HostMemory& operator=(HostMemory&& other) noexcept;

    void Map(size_t virtual_offset, size_t host_offset, size_t length);

    void Unmap(size_t virtual_offset, size_t length);

    void Protect(size_t virtual_offset, size_t length, bool read, bool write);

    [[nodiscard]] u8* BackingBasePointer() noexcept {
        return backing_base;
    }
    [[nodiscard]] const u8* BackingBasePointer() const noexcept {
        return backing_base;
    }

    [[nodiscard]] u8* VirtualBasePointer() noexcept {
        return virtual_base;
    }
    [[nodiscard]] const u8* VirtualBasePointer() const noexcept {
        return virtual_base;
    }

private:
    size_t backing_size{};
    size_t virtual_size{};

    // Low level handler for the platform dependent memory routines
    class Impl;
    std::unique_ptr<Impl> impl;
    u8* backing_base{};
    u8* virtual_base{};
    size_t virtual_base_offset{};
};

} // namespace Common