summaryrefslogtreecommitdiffstats
path: root/src/core/arm/arm_interface.h
blob: 85ed2c698db7471a966bb8d20c5f0e23d278a2e4 (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
133
134
135
136
137
138
139
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include "common/common_types.h"
#include "core/arm/skyeye_common/arm_regformat.h"

namespace Core {
    struct ThreadContext;
}

/// Generic ARM11 CPU interface
class ARM_Interface : NonCopyable {
public:
    ARM_Interface() {
        num_instructions = 0;
    }

    virtual ~ARM_Interface() {
    }

    /**
     * Runs the CPU for the given number of instructions
     * @param num_instructions Number of instructions to run
     */
    void Run(int num_instructions) {
        ExecuteInstructions(num_instructions);
        this->num_instructions += num_instructions;
    }

    /// Step CPU by one instruction
    void Step() {
        Run(1);
    }

    /**
     * Set the Program Counter to an address
     * @param addr Address to set PC to
     */
    virtual void SetPC(u32 addr) = 0;

    /*
     * Get the current Program Counter
     * @return Returns current PC
     */
    virtual u32 GetPC() const = 0;

    /**
     * Get an ARM register
     * @param index Register index (0-15)
     * @return Returns the value in the register
     */
    virtual u32 GetReg(int index) const = 0;

    /**
     * Set an ARM register
     * @param index Register index (0-15)
     * @param value Value to set register to
     */
    virtual void SetReg(int index, u32 value) = 0;

    /**
     * Get the current CPSR register
     * @return Returns the value of the CPSR register
     */
    virtual u32 GetCPSR() const = 0;

    /**
     * Set the current CPSR register
     * @param cpsr Value to set CPSR to
     */
    virtual void SetCPSR(u32 cpsr) = 0;

    /**
     * Gets the value stored in a CP15 register.
     * @param reg The CP15 register to retrieve the value from.
     * @return the value stored in the given CP15 register.
     */
    virtual u32 GetCP15Register(CP15Register reg) = 0;

    /**
     * Stores the given value into the indicated CP15 register.
     * @param reg   The CP15 register to store the value into.
     * @param value The value to store into the CP15 register.
     */
    virtual void SetCP15Register(CP15Register reg, u32 value) = 0;

    /**
     * Advance the CPU core by the specified number of ticks (e.g. to simulate CPU execution time)
     * @param ticks Number of ticks to advance the CPU core
     */
    virtual void AddTicks(u64 ticks) = 0;

    /**
     * Initializes a CPU context for use on this CPU
     * @param context Thread context to reset
     * @param stack_top Pointer to the top of the stack
     * @param entry_point Entry point for execution
     * @param arg User argument for thread
     */
    virtual void ResetContext(Core::ThreadContext& context, u32 stack_top, u32 entry_point, u32 arg) = 0;

    /**
     * Saves the current CPU context
     * @param ctx Thread context to save
     */
    virtual void SaveContext(Core::ThreadContext& ctx) = 0;

    /**
     * Loads a CPU context
     * @param ctx Thread context to load
     */
    virtual void LoadContext(const Core::ThreadContext& ctx) = 0;

    /// Prepare core for thread reschedule (if needed to correctly handle state)
    virtual void PrepareReschedule() = 0;

    /// Getter for num_instructions
    u64 GetNumInstructions() {
        return num_instructions;
    }

    s64 down_count; ///< A decreasing counter of remaining cycles before the next event, decreased by the cpu run loop

protected:

    /**
     * Executes the given number of instructions
     * @param num_instructions Number of instructions to executes
     */
    virtual void ExecuteInstructions(int num_instructions) = 0;

private:

    u64 num_instructions; ///< Number of instructions executed

};