logic.h

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#ifndef __LOGIC_H__
#define __LOGIC_H__

/* Copyright (c) 2012 by Fritz Sieker.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written
 * agreement is hereby granted, provided that the above copyright notice
 * and the following two paragraphs appear in all copies of this software,
 * that the files COPYING and NO_WARRANTY are included verbatim with
 * any distribution, and that the contents of the file README are included
 * verbatim as part of a file named README with any distribution.
 *
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE AUTHOR
 * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
 * BASIS, AND THE AUTHOR NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
 * UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 */

#include "lc3.h"
#include "hardware.h"

#define OK 0 
LC3_WORD logic_read_reg (int regNum);

void logic_write_reg (int regNum, LC3_WORD val);

LC3_WORD logic_read_memory (LC3_WORD addr);

void logic_write_memory (LC3_WORD addr, LC3_WORD value);

#define SR         DR
#define BaseR      SR1
#define nzp        DR

typedef struct inst_fields {
  LC3_WORD addr;         
  LC3_WORD bits;         
  opcode_t opcode;       
  int      DR;           
  int      SR1;          
  int      SR2;          
  int      bit5;         
  int      bit11;        
  LC3_WORD trapvect8;    
  LC3_WORD imm5;         
  LC3_WORD offset6;      
  LC3_WORD PCoffset9;    
  LC3_WORD PCoffset11;   
  LC3_WORD SR1OUT;       
  LC3_WORD SR2MUX[2];    
  LC3_WORD SR2MUXval;    
  LC3_WORD ADDR1MUX[2];  
  LC3_WORD ADDR2MUX[4];  
} instruction_t;

void logic_fetch_instruction (instruction_t* inst);

int logic_decode_instruction (instruction_t* inst);

int logic_execute_instruction (instruction_t* inst);

#define SelNotUsed 0 
#define SelImm     1 
#define SelReg     0 
#define SelBaseR   0 
#define SelPC      1 
#define SelSEXT11  0 
#define SelSEXT9   1 
#define SelSEXT6   2 
#define SelZero    3 
LC3_WORD logic_MARMUX (instruction_t* inst, int ADDRMUX1sel, int ADDRMUX2sel);

#endif