+
+ struct dcpu16_hw *hw_table_; /* list of hardware attached to system */
+ size_t hw_table_entries_; /* hardware list maintenance */
+ size_t hw_table_allocated_; /* hardware list maintenance */
+
+ unsigned long long cycle_; /* number of cycles this core has executed */
+ unsigned int skip_ : 1; /* skip execution of next instruction */
+ unsigned int interrupts_deferred_ : 1; /* queue software interrupts */
+ unsigned int on_fire_ : 1; /* cpu is on fire */
+ DCPU16_WORD reg_work_[2]; /* work registers for holding literal values while decoding instructions */
+ DCPU16_WORD interrupts_[DCPU16_INTERRUPT_QUEUE_SIZE]; /* fifo of pending interrupts */
+ size_t interrupts_head_; /* interrupt queue maintenance */
+ size_t interrupts_tail_; /* interrupt queue maintenance */
+
+ DCPU16_WORD reg[DCPU16_REG__NUM]; /* system registers, a b c x y z i j */
+ DCPU16_WORD ram[DCPU16_RAM]; /* memory */
+};
+
+/* these are used for accounting/watchpointing/modules/&c */
+typedef unsigned int dcpu16_acct_event;
+typedef void (dcpu16_ev_cb_t)(struct dcpu16 *, dcpu16_acct_event, DCPU16_WORD, void *);
+#define DCPU16_ACCT_EV_CYCLE (1<<1)
+#define DCPU16_ACCT_EV_READ (1<<2)
+#define DCPU16_ACCT_EV_WRITE (1<<3)
+#define DCPU16_ACCT_EV_REG_READ (1<<4)
+#define DCPU16_ACCT_EV_REG_WRITE (1<<5)
+#define DCPU16_ACCT_EV_NOP (1<<6)
+#define DCPU16_ACCT_EV_RESET (1<<7)
+struct dcpu16_acct_cb {
+ dcpu16_ev_cb_t *fn; /* call this */
+ void *data; /* also mention this */
+ dcpu16_acct_event mask; /* when (mask & event) is true and */
+ DCPU16_WORD addr_l, /* addr is this or higher and */
+ addr_h; /* addr is this or lower */
+};
+
+typedef void (dcpu16_hw_signal_t)(struct dcpu16 *, struct dcpu16_hw *);
+/* this structure defines a specific instance of this type of 'hardware' */
+struct dcpu16_hw {
+ struct dcpu16 *vm; /* which system do I belong to */
+ struct dcpu16_hw_module *mod; /* whence I came */
+ void *data; /* per-instance data */
+};
+
+/* human-readable text describing hw module control operations, for convenience's sake */
+struct dcpu16_hw_ctl_cmd {
+ char *command;
+ char *data_in_type;
+ char *data_out_type;
+ char *description;
+};
+
+typedef int (dcpu16_hw_data_init_t)(struct dcpu16_hw *, void *);
+typedef void (dcpu16_hw_data_free_t)(struct dcpu16_hw *);
+typedef int (dcpu16_hw_ctl_t)(struct dcpu16_hw *, const char *, void *, void *);
+struct dcpu16_hw_module {
+ char *name_; /* dymo label on front panel */
+
+ DCPU16_WORD id_l;
+ DCPU16_WORD id_h;
+ DCPU16_WORD ver;
+ DCPU16_WORD mfg_l;
+ DCPU16_WORD mfg_h;
+
+ dcpu16_hw_signal_t *hwi; /* hardware interrupt handler */
+ dcpu16_hw_signal_t *cycle; /* cycle tick handler */
+ dcpu16_hw_signal_t *reset; /* reset handler */
+
+ dcpu16_hw_data_init_t *data_init; /* how to allocate a dcpu16_hw instance's data */
+ dcpu16_hw_data_free_t *data_free;
+ dcpu16_hw_ctl_t *ctl;
+ struct dcpu16_hw_ctl_cmd *ctl_cmd;