citra/src/core/hle/service/gsp.h

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

#pragma once

#include "common/bit_field.h"
#include "core/hle/service/service.h"

////////////////////////////////////////////////////////////////////////////////////////////////////
// Namespace GSP_GPU

namespace GSP_GPU {

/// GSP interrupt ID
enum class InterruptId : u8 {
    PSC0    = 0x00,
    PSC1    = 0x01,
    PDC0    = 0x02, // Seems called every vertical screen line
    PDC1    = 0x03, // Seems called every frame
    PPF     = 0x04,
    P3D     = 0x05,
    DMA     = 0x06,
};

/// GSP command ID
enum class CommandId : u32 {
    REQUEST_DMA            = 0x00,
    SET_COMMAND_LIST_LAST  = 0x01,

    // Fills a given memory range with a particular value
    SET_MEMORY_FILL        = 0x02,

    // Copies an image and optionally performs color-conversion or scaling.
    // This is highly similar to the GameCube's EFB copy feature
    SET_DISPLAY_TRANSFER   = 0x03,

    // Conceptionally similar to SET_DISPLAY_TRANSFER and presumable uses the same hardware path
    SET_TEXTURE_COPY       = 0x04,

    SET_COMMAND_LIST_FIRST = 0x05,
};

/// GSP thread interrupt relay queue
struct InterruptRelayQueue {
    union {
        u32 hex;

        // Index of last interrupt in the queue
        BitField<0,8,u32>   index;

        // Number of interrupts remaining to be processed by the userland code
        BitField<8,8,u32>   number_interrupts;

        // Error code - zero on success, otherwise an error has occurred
        BitField<16,8,u32>  error_code;
    };

    u32 unk0;
    u32 unk1;

    InterruptId slot[0x34];   ///< Interrupt ID slots
};
static_assert(sizeof(InterruptRelayQueue) == 0x40,
    "InterruptRelayQueue struct has incorrect size");

/// GSP command
struct Command {
    BitField<0, 8, CommandId> id;

    union {
        struct {
            u32 source_address;
            u32 dest_address;
            u32 size;
        } dma_request;

        struct {
            u32 address;
            u32 size;
        } set_command_list_last;

        struct {
            u32 start1;
            u32 value1;
            u32 end1;
            u32 start2;
            u32 value2;
            u32 end2;
        } memory_fill;

        struct {
            u32 in_buffer_address;
            u32 out_buffer_address;
            u32 in_buffer_size;
            u32 out_buffer_size;
            u32 flags;
        } image_copy;

        u8 raw_data[0x1C];
    };
};
static_assert(sizeof(Command) == 0x20, "Command struct has incorrect size");

/// GSP shared memory GX command buffer header
struct CommandBuffer {
    union {
        u32 hex;

        // Current command index. This index is updated by GSP module after loading the command
        // data, right before the command is processed. When this index is updated by GSP module,
        // the total commands field is decreased by one as well.
        BitField<0,8,u32>   index;

        // Total commands to process, must not be value 0 when GSP module handles commands. This
        // must be <=15 when writing a command to shared memory. This is incremented by the
        // application when writing a command to shared memory, after increasing this value
        // TriggerCmdReqQueue is only used if this field is value 1.
        BitField<8,8,u32>   number_commands;
    };

    u32 unk[7];

    Command commands[0xF];
};
static_assert(sizeof(CommandBuffer) == 0x200, "CommandBuffer struct has incorrect size");

/// Interface to "srv:" service
class Interface : public Service::Interface {
public:

    Interface();

    ~Interface();

    /**
     * Gets the string port name used by CTROS for the service
     * @return Port name of service
     */
    std::string GetPortName() const {
        return "gsp::Gpu";
    }

};

/**
 * Signals that the specified interrupt type has occurred to userland code
 * @param interrupt_id ID of interrupt that is being signalled
 */
void SignalInterrupt(InterruptId interrupt_id);

} // namespace