citra/src/core/hle/coprocessor.cpp

// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.  

#include "core/hle/coprocessor.h"
#include "core/hle/hle.h"
#include "core/mem_map.h"
#include "core/core.h"

namespace HLE {

enum {
    CMD_GX_REQUEST_DMA  = 0x00000000,
};

/// Data synchronization barrier
u32 DataSynchronizationBarrier(u32* command_buffer) {
    u32 command = command_buffer[0];

    switch (command) {

    case CMD_GX_REQUEST_DMA:
        {
            u32* src = (u32*)Memory::GetPointer(command_buffer[1]);
            u32* dst = (u32*)Memory::GetPointer(command_buffer[2]);
            u32 size = command_buffer[3];
            memcpy(dst, src, size);
        }
        break;

    default:
        ERROR_LOG(OSHLE, "MRC::DataSynchronizationBarrier unknown command 0x%08X", command);
        return -1;
    }

    return 0;
}

/// Returns the coprocessor (in this case, syscore) command buffer pointer
Addr GetThreadCommandBuffer() {
    // Called on insruction: mrc p15, 0, r0, c13, c0, 3
    // Returns an address in OSHLE memory for the CPU to read/write to
    RETURN(CMD_BUFFER_ADDR);
    return CMD_BUFFER_ADDR;
}

/// Call an MRC operation in HLE
u32 CallMRC(ARM11_MRC_OPERATION operation) {
    switch (operation) {

    case DATA_SYNCHRONIZATION_BARRIER:
        return DataSynchronizationBarrier((u32*)Memory::GetPointer(PARAM(0)));

    case CALL_GET_THREAD_COMMAND_BUFFER:
        return GetThreadCommandBuffer();

    default:
        ERROR_LOG(OSHLE, "unimplemented MRC operation 0x%02X", operation);
        break;
    }
    return -1;
}

} // namespace