dingusppc/devices/common/dmacore.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file Core definitions for direct memory access (DMA) emulation. */
#ifndef DMA_CORE_H
#define DMA_CORE_H
#include <string>
enum DmaPullResult : int {
MoreData, // data source has more data to be pulled
NoMoreData, // data source has no more data to be pulled
};
class DmaOutChannel {
public:
DmaOutChannel(std::string name) { this->name = name; };
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virtual bool is_active() { return true; };
virtual DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data) = 0;
std::string get_name(void) { return this->name; };
private:
std::string name;
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};
class DmaInChannel {
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public:
DmaInChannel(std::string name) { this->name = name; };
virtual int push_data(const char* src_ptr, int len) = 0;
std::string get_name(void) { return this->name; };
private:
std::string name;
};
// Base class for bidirectional DMA channels.
class DmaBidirChannel : public DmaOutChannel, public DmaInChannel {
public:
DmaBidirChannel(std::string name) : DmaOutChannel(name + " Out"),
DmaInChannel(name + std::string(" In")) { this->name = name; };
std::string get_name(void) { return this->name; };
private:
std::string name;
};
#endif // DMA_CORE_H