src/dps8/dps8

/* */
   1 /*
   2  * vim: filetype=c:tabstop=4:ai:expandtab
   3  * SPDX-License-Identifier: ICU
   4  * scspell-id: dab0da0d-f62e-11ec-8f5d-80ee73e9b8e7
   5  *
   6  * ---------------------------------------------------------------------------
   7  *
   8  * Copyright (c) 2007-2013 Michael Mondy
   9  * Copyright (c) 2012-2016 Harry Reed
  10  * Copyright (c) 2013-2022 Charles Anthony
  11  * Copyright (c) 2021-2025 The DPS8M Development Team
  12  *
  13  * This software is made available under the terms of the ICU License.
  14  * See the LICENSE.md file at the top-level directory of this distribution.
  15  *
  16  * ---------------------------------------------------------------------------
  17  */
  18 
  19 // Devices connected to a SCU
  20 enum active_dev { ADEV_NONE, ADEV_CPU, ADEV_IOM };
  21 
  22 typedef struct
  23   {
  24     volAtomic uint port_enable [N_SCU_PORTS];  // enable/disable
  25 
  26     // Mask registers A and B, each with 32 interrupt bits.
  27     volAtomic word32 exec_intr_mask [N_ASSIGNMENTS];
  28 
  29     // Mask assignment.
  30     // 2 mask registers, A and B, each 32 bits wide.
  31     // A CPU will be attached to port N.
  32     // Mask assignment assigns a mask register (A or B) to a CPU
  33     // on port N.
  34     // That is, when interrupt I is set:
  35     //   For reg = A, B
  36     //
  37     // Mask A, B is set to Off or 0-7.
  38     // mask_enable [A|B] says that mask A or B is not off
  39     // if (mask_enable) then mask_assignment is a port number
  40     volAtomic uint mask_enable [N_ASSIGNMENTS];     // enable/disable
  41     volAtomic uint mask_assignment [N_ASSIGNMENTS]; // assigned port number
  42 
  43     volAtomic uint cells [N_CELL_INTERRUPTS];
  44 
  45     uint lower_store_size; // In K words, power of 2; 32 - 4096
  46     uint cyclic;           // 7 bits
  47     uint nea;              // 8 bits
  48     uint onl;              // 4 bits
  49     uint interlace;        // 1 bit
  50     uint lwr;              // 1 bit
  51 
  52     // Note that SCUs had no switches to designate SCU 'A' or 'B', etc.
  53     // Instead, SCU "A" is the one with base address switches set for 01400,
  54     // SCU "B" is the SCU with base address switches set to 02000, etc.
  55     // uint mem_base; // zero on boot scu
  56     // mode reg: mostly not stored here; returned by scu_get_mode_register()
  57     // int mode; // program/manual; if 1, sscr instruction can set some fields
  58 
  59     // CPU/IOM connectivity; designated 0..7
  60     // [CAC] really CPU/SCU and SCU/IOM connectivity
  61     struct ports
  62       {
  63         //bool is_enabled;
  64         enum active_dev type; // type of connected device
  65         int dev_idx; // index of connected dev (cpu_unit_udx, iom_unit_idx
  66         bool is_exp;
  67         // which port on the connected device?
  68         // if is_exp is false, then only [0] is used.
  69         // if true, one connection for each sub-port; -1 if not connected
  70         volAtomic int dev_port [N_SCU_SUBPORTS];
  71         volAtomic bool subport_enables [N_SCU_SUBPORTS];
  72         volAtomic bool xipmask [N_SCU_SUBPORTS];
  73         volAtomic int xipmaskval;
  74       } ports [N_SCU_PORTS];
  75 
  76     // system controller mode register
  77     word4 id;
  78     word18 mode_reg;
  79 
  80     uint elapsed_days;
  81     uint steady_clock;    // If non-zero the clock is tied to the cycle counter
  82     uint bullet_time;
  83     uint y2k;
  84     int64 user_correction;
  85     uint64 last_time;
  86 } scu_t;
  87 
  88 extern scu_t scu [N_SCU_UNITS_MAX];
  89 
  90 extern DEVICE scu_dev;
  91 
  92 int scu_set_interrupt(uint scu_unit_idx, uint inum);
  93 void scu_init (void);
  94 t_stat scu_sscr (cpu_state_t * cpup, uint scu_unit_idx, UNUSED uint cpu_unit_idx, uint cpu_port_num, word18 addr,
  95                  word36 rega, word36 regq);
  96 t_stat scu_smic (cpu_state_t * cpup, uint scu_unit_idx, uint UNUSED cpu_unit_idx, uint cpu_port_num, word36 rega);
  97 t_stat scu_rscr (cpu_state_t * cpup, uint scu_unit_idx, uint cpu_unit_idx, word18 addr, word36 * rega, word36 * regq);
  98 int scu_cioc (uint cpu_unit_idx, uint scu_unit_idx, uint scu_port_num, uint expander_command, uint sub_mask);
  99 t_stat scu_rmcm (uint scu_unit_idx, uint cpu_unit_idx, word36 * rega, word36 * regq);
 100 t_stat scu_smcm (uint scu_unit_idx, uint cpu_unit_idx, word36 rega, word36 regq);
 101 void scu_clear_interrupt (uint scu_unit_idx, uint inum);
 102 uint scu_get_highest_intr (uint scu_unit_idx);
 103 t_stat scu_reset (DEVICE *dptr);
 104 t_stat scu_reset_unit (UNIT * uptr, int32 value, const char * cptr,
 105                        void * desc);
 106 void scu_unit_reset (int scu_unit_idx);
/* */
root/src/dps8/dps8_scu.h

INCLUDED FROM
