79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Core definitions for direct memory access (DMA) emulation. */
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#ifndef DMA_CORE_H
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#define DMA_CORE_H
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#include <cstdint>
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#include <string>
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enum DmaPullResult : int {
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MoreData, // data source has more data to be pulled
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NoMoreData, // data source has no more data to be pulled
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};
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class DmaOutChannel {
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public:
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DmaOutChannel(std::string name) { this->name = name; };
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virtual bool is_out_active() { return true; };
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virtual DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len,
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uint8_t **p_data) = 0;
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virtual int get_pull_data_remaining() { return 1; };
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virtual void end_pull_data() { };
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std::string get_name(void) { return this->name; };
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private:
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std::string name;
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};
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class DmaInChannel {
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public:
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DmaInChannel(std::string name) { this->name = name; };
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virtual bool is_in_active() { return true; };
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virtual int push_data(const char* src_ptr, int len) = 0;
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virtual int get_push_data_remaining() { return 1; };
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virtual void end_push_data() { };
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std::string get_name(void) { return this->name; };
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private:
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std::string name;
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};
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// Base class for bidirectional DMA channels.
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class DmaBidirChannel : public DmaOutChannel, public DmaInChannel {
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public:
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DmaBidirChannel(std::string name) : DmaOutChannel(name + " Out"),
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DmaInChannel(name + std::string(" In")) { this->name = name; };
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std::string get_name(void) { return this->name; };
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private:
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std::string name;
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};
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#endif // DMA_CORE_H
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