summaryrefslogtreecommitdiffstats
path: root/src/core/core.h
blob: 8194db6a2c1a91f3bba5f5ebf76fbc6eba26d546 (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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <memory>
#include <string>

#include "common/common_types.h"
#include "core/memory.h"

class EmuWindow;
class ARM_Interface;

namespace Loader {
class AppLoader;
}

namespace Core {

struct ThreadContext {
    u32 cpu_registers[13];
    u32 sp;
    u32 lr;
    u32 pc;
    u32 cpsr;
    u32 fpu_registers[64];
    u32 fpscr;
    u32 fpexc;
};

class System {
public:
    /**
     * Gets the instance of the System singleton class.
     * @returns Reference to the instance of the System singleton class.
     */
    static System& GetInstance() {
        return s_instance;
    }

    /// Enumeration representing the return values of the System Initialize and Load process.
    enum class ResultStatus : u32 {
        Success, ///< Succeeded
        ErrorNotInitialized, ///< Error trying to use core prior to initialization
        ErrorGetLoader, ///< Error finding the correct application loader
        ErrorSystemMode, ///< Error determining the system mode
        ErrorLoader, ///< Error loading the specified application
        ErrorLoader_ErrorEncrypted, ///< Error loading the specified application due to encryption
        ErrorLoader_ErrorInvalidFormat, ///< Error loading the specified application due to an invalid format
        ErrorVideoCore, ///< Error in the video core
    };

    /**
     * Run the core CPU loop
     * This function runs the core for the specified number of CPU instructions before trying to update
     * hardware. This is much faster than SingleStep (and should be equivalent), as the CPU is not
     * required to do a full dispatch with each instruction. NOTE: the number of instructions requested
     * is not guaranteed to run, as this will be interrupted preemptively if a hardware update is
     * requested (e.g. on a thread switch).
     * @param tight_loop Number of instructions to execute.
     * @return Result status, indicating whethor or not the operation succeeded.
     */
    ResultStatus RunLoop(int tight_loop = 1000);

    /**
     * Step the CPU one instruction
     * @return Result status, indicating whethor or not the operation succeeded.
     */
    ResultStatus SingleStep();

    /// Shutdown the emulated system.
    void Shutdown();

    /**
     * Load an executable application.
     * @param emu_window Pointer to the host-system window used for video output and keyboard input.
     * @param filepath String path to the executable application to load on the host file system.
     * @returns ResultStatus code, indicating if the operation succeeded.
     */
    ResultStatus Load(EmuWindow* emu_window, const std::string& filepath);

    /**
     * Indicates if the emulated system is powered on (all subsystems initialized and able to run an
     * application).
     * @returns True if the emulated system is powered on, otherwise false.
     */
    bool IsPoweredOn() const {
        return app_core != nullptr;
    }

    /// Prepare the core emulation for a reschedule
    void PrepareReschedule();

    /**
     * Gets a reference to the emulated AppCore CPU.
     * @returns A reference to the emulated AppCore CPU.
     */
    ARM_Interface& AppCore() {
        return *app_core;
    }

private:
    /**
     * Initialize the emulated system.
     * @param emu_window Pointer to the host-system window used for video output and keyboard input.
     * @param system_mode The system mode.
     * @return ResultStatus code, indicating if the operation succeeded.
     */
    ResultStatus Init(EmuWindow* emu_window, u32 system_mode);

    /// Reschedule the core emulation
    void Reschedule();

    /// AppLoader used to load the current executing application
    std::unique_ptr<Loader::AppLoader> app_loader;

    ///< ARM11 application core
    std::unique_ptr<ARM_Interface> app_core;

    /// When true, signals that a reschedule should happen
    bool reschedule_pending{};

    static System s_instance;
};

static ARM_Interface& AppCore() {
    return System::GetInstance().AppCore();
}

} // namespace Core