177be95e5d
This change is a major refactor of how DMA and the DUART interact. DMA implementation can now be overridden by individual devices that require DMA. Disk and Floppy both continue to use a generic DMA implementation, but the DUART code replaces the generic DMA with its own implementation that correctly rate-limits TX. Among other things, this allows the simulator to work correctly with real serial terminals. This functionality has been tested on an AT&T 5620 "Blit" terminal, which can run the 'layers' windowing software from the simulator.
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* 3b2_cpu.h: AT&T 3B2 Model 400 Floppy (TMS2797NL) Header
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Copyright (c) 2017, Seth J. Morabito
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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Except as contained in this notice, the name of the author shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the author.
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*/
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#ifndef __3B2_IF_H__
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#define __3B2_IF_H__
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#include "3b2_defs.h"
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#include "3b2_sysdev.h"
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#include "3b2_sys.h"
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typedef struct {
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uint8 data;
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uint8 cmd;
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uint8 cmd_type;
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uint8 status;
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uint8 track;
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uint8 sector;
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uint8 side;
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uint8 read_addr_ptr;
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int8 step_dir;
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t_bool drq;
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} IF_STATE;
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extern DEVICE if_dev;
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extern DEBTAB sys_deb_tab[];
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extern IF_STATE if_state;
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extern t_bool if_irq;
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#define IFBASE 0x4d000
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#define IFSIZE 0x10
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#define IF_STATUS_REG 0
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#define IF_CMD_REG 0
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#define IF_TRACK_REG 1
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#define IF_SECTOR_REG 2
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#define IF_DATA_REG 3
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/* Status Bits */
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#define IF_BUSY 0x01
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#define IF_DRQ 0x02
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#define IF_INDEX 0x02
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#define IF_TK_0 0x04
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#define IF_LOST_DATA 0x04
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#define IF_CRC_ERR 0x08
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#define IF_SEEK_ERR 0x10
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#define IF_RNF 0x10
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#define IF_HEAD_LOADED 0x20
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#define IF_RECORD_TYPE 0x20
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#define IF_WP 0x40
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#define IF_NRDY 0x80
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/* Type I Commands */
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#define IF_RESTORE 0x00
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#define IF_SEEK 0x10
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#define IF_STEP 0x20
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#define IF_STEP_T 0x30
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#define IF_STEP_IN 0x40
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#define IF_STEP_IN_T 0x50
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#define IF_STEP_OUT 0x60
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#define IF_STEP_OUT_T 0x70
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/* Type II Commands */
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#define IF_READ_SEC 0x80
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#define IF_READ_SEC_M 0x90
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#define IF_WRITE_SEC 0xA0
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#define IF_WRITE_SEC_M 0xB0
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/* Type III Commands */
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#define IF_READ_ADDR 0xC0
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#define IF_READ_TRACK 0xE0
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#define IF_WRITE_TRACK 0xF0
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/* Type IV Command */
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#define IF_FORCE_INT 0xD0
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/* Command flags */
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#define IF_C_FLAG 0x02
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#define IF_V_FLAG 0x04
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#define IF_E_FLAG 0x04
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#define IF_U_FLAG 0x02
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#define IF_H_FLAG 0x08
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#define IF_S_FLAG 0x10
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/* Constants */
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#define IF_SIDES 2
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#define IF_TRACK_SIZE 4608
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#define IF_SECTOR_SIZE 512
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#define IF_TRACK_COUNT 80
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#define IF_STEP_IN_DIR 1
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#define IF_STEP_OUT_DIR -1
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#define IF_DSK_SIZE (IF_SIDES * IF_TRACK_SIZE * IF_TRACK_COUNT)
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/* Function prototypes */
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static SIM_INLINE void if_set_irq();
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static SIM_INLINE void if_clear_irq();
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static SIM_INLINE void if_cancel_pending_irq();
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static SIM_INLINE uint32 if_buf_offset();
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t_stat if_svc(UNIT *uptr);
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t_stat if_reset(DEVICE *dptr);
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uint32 if_read(uint32 pa, size_t size);
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void if_write(uint32 pa, uint32 val, size_t size);
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void if_handle_command();
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void if_after_dma();
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#endif
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