/* how much ram the system has */
#define DCPU16_RAM 0x10000
+#define DCPU16_INTERRUPT_QUEUE_SIZE 256
/* a self-contained dcpu16 core */
struct dcpu16 {
struct dcpu16_acct_cb *cb_table_; /* list of callbacks to invoke for certain events */
size_t cb_table_entries_; /* callback list maintenance */
size_t cb_table_allocated_; /* callback list maintenance */
+
+ 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 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 */
unsigned long long cycle; /* number of cycles this core has executed */
DCPU16_WORD reg[8]; /* system registers, a b c x y z i j */
DCPU16_WORD pc; /* program counter */
DCPU16_WORD sp; /* stack pointer */
- DCPU16_WORD o; /* overflow */
+ DCPU16_WORD ex; /* overflow */
+ DCPU16_WORD ia; /* interrupt address */
DCPU16_WORD ram[DCPU16_RAM]; /* memory */
};
dcpu16_acct_event mask;
};
+/* these are used to define hardware attached to the system */
+struct dcpu16_hw {
+ char *name_;
+ DCPU16_WORD id_l;
+ DCPU16_WORD id_h;
+ DCPU16_WORD ver;
+ DCPU16_WORD mfg_l;
+ DCPU16_WORD mfg_h;
+ void (*int_fn)(struct dcpu16 *, void *);
+ void *data;
+};
+
/* instantiate a new core */
struct dcpu16 *dcpu16_new(void);
/* print the contents of ram from second to third argument */
void dcpu16_dump_ram(struct dcpu16 *, DCPU16_WORD, DCPU16_WORD);
+/* print words in buf as asm */
+DCPU16_WORD dcpu16_mnemonify_buf(DCPU16_WORD *);
+
/* print the instruction at the specified address, returns number of words consumed in decoding */
DCPU16_WORD dcpu16_disassemble_print(struct dcpu16 *, DCPU16_WORD);
+/* register new 'hardware' device with system */
+int dcpu16_hw_add(struct dcpu16 *, struct dcpu16_hw *);
+
/* register a callback for an accounting event */
-int dcpu16_acct_add(struct dcpu16 *, dcpu16_acct_event mask, dcpu16_ev_cb_t *fn, void *data);
+int dcpu16_acct_add(struct dcpu16 *, dcpu16_acct_event, dcpu16_ev_cb_t *, void *);
/* execute the next instruction */
void dcpu16_step(struct dcpu16 *);