mirror of
https://github.com/dingusdev/dingusppc.git
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11d61359c1
Allow the dbdma program to initiate reading/writing by adding in and out callbacks. Support the DBDMA flush command by adding a flush callback. If the transfer completes, then clear the flush flag, otherwise leave it unchanged. Clear the flush flag after it is copied to the xferStatus of the DBDMA command.
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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