/**

  * $Id: cpu.h,v 1.6 2005-12-25 05:56:55 nkeynes Exp $

  * 

  * Generic CPU definitions, primarily for providing information to the GUI.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #ifndef dream_cpu_H

 #define dream_cpu_H 1

 #include <stdint.h>

 #include <stdlib.h>

 #include <glib/gtypes.h>

 #ifdef __cplusplus

 extern "C" {

 #endif

 /**

  * Disassembly function pointer typedef.

  *

  * @param pc Address to disassemble

  * @param buffer String buffer to write disassembly into

  * @param buflen Maximum length of buffer

  * @return next address to disassemble

  */

 typedef uint32_t (*disasm_func_t)(uint32_t pc, char *buffer, int buflen, char *opcode );

 typedef int (*is_valid_page_t)(uint32_t pc);

 typedef gboolean (*step_func_t)();

 #define REG_INT 0

 #define REG_FLT 1

 #define REG_SPECIAL 2

 /**

  * Structure that defines a single register in a CPU for display purposes.

  */

 typedef struct reg_desc_struct {

     char *name;

     int type;

     void *value;

 } reg_desc_t;

 /**

  * CPU definition structure - basic information and support functions.

  */

 typedef struct cpu_desc_struct {

   char *name; /* CPU Name */

   disasm_func_t disasm_func; /* Disassembly function */

   step_func_t step_func; /* Single step function */

   is_valid_page_t is_valid_page_func; /* Test for valid memory page */

   size_t instr_size; /* Size of instruction */

   char *regs; /* Pointer to start of registers */

   size_t regs_size; /* Size of register structure in bytes */

   const struct reg_desc_struct *regs_info; /* Description of all registers */

   uint32_t *pc; /* Pointer to PC register */

   uint32_t *icount; /* Pointer to instruction counter */

 } *cpu_desc_t;

 #ifdef __cplusplus

 }

 #endif

 #endif /* !dream_cpu_H */