9d849283a4
- This change introduces a full refactor of the interrupt subsystem
for the system board (SBD) and the I/O bus (CIO). Interrupt decode
should now be significantly faster, and not require an expensive
calculation on every step.
- The TIMER device has been split into Rev 2 and Rev 3
implementations.
- The optional 3B2/400 Debug Monitor ROMs can now be booted by passing
the "DEMON" argument to the 3B2/400 simulator BOOT command. Any
of the following will cause the Debug Monitor ROM to be booted
instead of the standard 3B2/400 ROM:
sim> BOOT DEMON
sim> BOOT CPU DEMON
sim> BOOT DEMON CPU
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* 3b2_if.h: AT&T 3B2 Model Floppy Controller (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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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 defined(REV3)
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uint8 csr;
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#endif
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} IF_STATE;
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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_SEC_COUNT 9
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#define IF_SEC_SIZE 512
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#define IF_TRACK_SIZE 4608
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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_SECS (IF_SIDES * IF_TRACK_COUNT * IF_SEC_COUNT)
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/* Function prototypes */
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t_stat if_svc(UNIT *uptr);
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t_stat if_reset(DEVICE *dptr);
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t_stat if_attach(UNIT *uptr, CONST char *cptr);
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t_stat if_detach(UNIT *uptr);
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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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#if defined(REV3)
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uint32 if_csr_read(uint32 pa, size_t size);
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void if_csr_write(uint32 pa, uint32 val, size_t size);
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#endif
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void if_handle_command();
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void if_after_dma();
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CONST char *if_description(DEVICE *dptr);
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t_stat if_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);
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extern IF_STATE if_state;
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#endif
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