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https://github.com/dingusdev/dingusppc.git
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fb0396923f
When fetching DMA command, make sure to convert little endian fields to host endianness (i.e. don't use memcpy). When fetching DMA command, return the host address of the DMA command for LOAD_QUAD. Maybe this address should be cached whenever this->cmdptr changes? When fetching DMA command, return whether the DMA command is writable. For LOAD_QUAD, pass the address of the DMA command to xfer_quad. Always log unexpected DMA command values. Write full 32-bit value for LOAD_QUAD. Write reqCount to resCount.
137 lines
3.8 KiB
C++
137 lines
3.8 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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 Descriptor-based direct memory access emulation.
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Official documentation can be found in the fifth chapter of the book
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"Macintosh Technology in the Common Hardware Reference Platform"
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by Apple Computer, Inc.
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*/
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#ifndef DB_DMA_H
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#define DB_DMA_H
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#include <devices/common/dmacore.h>
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#include <cinttypes>
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#include <functional>
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class InterruptCtrl;
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/** DBDMA Channel registers offsets */
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enum DMAReg : uint32_t {
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CH_CTRL = 0,
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CH_STAT = 4,
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CMD_PTR_HI = 8,
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CMD_PTR_LO = 12,
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INT_SELECT = 16,
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BRANCH_SELECT = 20,
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WAIT_SELECT = 24,
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};
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/** Channel Status bits (DBDMA spec, 5.5.3) */
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enum : uint16_t {
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CH_STAT_ACTIVE = 0x400,
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CH_STAT_DEAD = 0x800,
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CH_STAT_WAKE = 0x1000,
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CH_STAT_FLUSH = 0x2000,
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CH_STAT_PAUSE = 0x4000,
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CH_STAT_RUN = 0x8000
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};
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/** DBDMA command (DBDMA spec, 5.6.1) - all fields are little-endian! */
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typedef struct DMACmd {
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uint16_t req_count;
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uint8_t cmd_bits;
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uint8_t cmd_key;
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uint32_t address;
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uint32_t cmd_arg;
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uint16_t res_count;
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uint16_t xfer_stat;
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} DMACmd;
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namespace DBDMA_Cmd {
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enum : uint8_t {
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OUTPUT_MORE = 0,
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OUTPUT_LAST = 1,
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INPUT_MORE = 2,
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INPUT_LAST = 3,
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STORE_QUAD = 4,
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LOAD_QUAD = 5,
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NOP = 6,
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STOP = 7
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};
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};
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typedef std::function<void(void)> DbdmaCallback;
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class DMAChannel : public DmaBidirChannel {
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public:
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DMAChannel(std::string name) : DmaBidirChannel(name) {}
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~DMAChannel() = default;
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void set_callbacks(DbdmaCallback start_cb, DbdmaCallback stop_cb);
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uint32_t reg_read(uint32_t offset, int size);
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void reg_write(uint32_t offset, uint32_t value, int size);
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bool is_active();
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DmaPullResult pull_data(uint32_t req_len, uint32_t *avail_len, uint8_t **p_data);
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int push_data(const char* src_ptr, int len);
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void register_dma_int(InterruptCtrl* int_ctrl_obj, uint32_t irq_id) {
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this->int_ctrl = int_ctrl_obj;
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this->irq_id = irq_id;
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};
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protected:
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DMACmd* fetch_cmd(uint32_t cmd_addr, DMACmd* p_cmd, bool *is_writable);
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uint8_t interpret_cmd(void);
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void finish_cmd();
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void xfer_quad(const DMACmd *cmd_desc, DMACmd *cmd_host);
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void update_irq();
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void start(void);
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void resume(void);
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void abort(void);
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void pause(void);
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private:
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std::function<void(void)> start_cb = nullptr; // DMA channel start callback
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std::function<void(void)> stop_cb = nullptr; // DMA channel stop callback
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uint16_t ch_stat = 0;
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uint32_t cmd_ptr = 0;
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uint32_t queue_len = 0;
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uint8_t* queue_data = 0;
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uint32_t int_select = 0;
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uint32_t branch_select = 0;
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uint32_t wait_select = 0;
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bool cmd_in_progress = false;
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uint8_t cur_cmd;
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// Interrupt related stuff
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InterruptCtrl* int_ctrl = nullptr;
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uint32_t irq_id = 0;
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};
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#endif /* DB_DMA_H */
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