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123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
/* unibus.h: shared structs used in PRU and ARM
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Copyright (c) 2018, Joerg Hoppe
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j_hoppe@t-online.de, www.retrocmp.com
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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JOERG HOPPE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN 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 SOFTWARE.
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12-nov-2018 JH entered beta phase
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19-may-2018 JH created
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*/
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#ifndef _UNIBUS_H_
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#define _UNIBUS_H_
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#include <stdint.h>
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#define UNIBUS_WORDCOUNT 0x20000 // 128KiW = 256 KiB
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// bus transaction. can be directly assigned to lines C1,C0
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#define UNIBUS_CONTROL_DATI 0x00 // 16 bit word from slave to master
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#define UNIBUS_CONTROL_DATIP 0x01 // DATI, inhibts core restore. DATO must follow.
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#define UNIBUS_CONTROL_DATO 0x02 // 16 bit word from master to slave
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#define UNIBUS_CONTROL_DATOB 0x03 // 8 bit byte from master to slave
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// data<15:8> for a00 = 1, data<7:0> for a00 = 0
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#define UNIBUS_CONTROL_ISDATO(c) (!!((c) & 0x02)) // check for DATO/B
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#define UNIBUS_TIMEOUTVAL 0xffffffff // EXAM result for bus timeout
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// This simple byte/word union works only because PDP-11,ARM and PRU all are little endian.
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// "PDP-11 is little-endian (with least significant bytes first)."
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// "BeagleBone Debian: lscpu shows that it is little endian."
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// pru c-compile is NOT called with --endian=big
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typedef struct {
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union {
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uint16_t words[UNIBUS_WORDCOUNT];
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uint8_t bytes[2 * UNIBUS_WORDCOUNT];
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};
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} unibus_memory_t;
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#ifdef ARM
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// included only by ARM code
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#include "logsource.hpp"
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#include "utils.hpp"
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// parameter and functions for low level UNIBUS control
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class dma_request_c;
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class intr_request_c;
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class unibus_c: public logsource_c {
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public:
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enum arbitration_mode_enum {
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ARBITRATION_MODE_NONE = 0, // no BR*/BG*, NR/NPG SACK protocoll
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ARBITRATION_MODE_CLIENT = 1, // external Arbitrator (running PDP-11 CPU) required
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ARBITRATION_MODE_MASTER = 2 // implmenet Arbitrator
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// with or without physical CPU for arbitration
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};
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private:
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timeout_c timeout;
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public:
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unibus_c();
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~unibus_c();
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static char *control2text(uint8_t control);
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static char *data2text(unsigned val);
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void init(void);
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static void set_arbitration_mode(enum arbitration_mode_enum arbitration_mode);
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void powercycle(void);
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// functions of unibusadapter to do simple DMA
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dma_request_c *dma_request;
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//intr_request_c *intr_request;
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bool dma(enum unibus_c::arbitration_mode_enum arbitration_mode, bool blocking, uint8_t control,
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uint32_t startaddr, uint16_t *buffer, unsigned wordcount);
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void mem_read(enum unibus_c::arbitration_mode_enum arbitration_mode, uint16_t *words,
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uint32_t unibus_start_addr, uint32_t unibus_end_addr, bool *timeout);
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void mem_write(enum unibus_c::arbitration_mode_enum arbitration_mode, uint16_t *words,
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unsigned unibus_start_addr, unsigned unibus_end_addr, bool *timeout);
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void mem_access_random(enum unibus_c::arbitration_mode_enum arbitration_mode,
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uint8_t unibus_control, uint16_t *words, uint32_t unibus_start_addr,
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uint32_t unibus_end_addr, bool *timeout, uint32_t *block_counter);
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uint32_t test_sizer(enum unibus_c::arbitration_mode_enum arbitration_mode);
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uint16_t testwords[UNIBUS_WORDCOUNT];
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void test_mem(enum unibus_c::arbitration_mode_enum arbitration_mode, uint32_t start_addr,
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uint32_t end_addr, unsigned mode);
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};
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extern unibus_c *unibus;
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#endif /* ARM */
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#endif /* _UNIBUS_H_ */
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