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/*
z80 - Z80 emulation
Copyright (C) 2006 Ian Cowburn <ianc@noddybox.co.uk>
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-------------------------------------------------------------------------
$Id$
*/
#ifndef Z80_H
#define Z80_H "$Id$"
/* ---------------------------------------- TYPES
*/
/* The processor
*/
struct Z80;
typedef struct Z80 Z80;
/* Large unsigned type
*/
typedef unsigned long Z80Val;
/* 8-bit type. The emulation will exit with code 2 if this isn't 8 bits.
*/
typedef unsigned char Z80Byte;
/* 8-bit signed type. The emulation will exit with code 2 if this isn't 8 bits.
*/
typedef signed char Z80Relative;
/* 16-bit type. The emulation will exit with code 2 if this isn't 16 bits.
*/
typedef unsigned short Z80Word;
/* Memory
*/
typedef Z80Byte Z80Memory[0x10000];
/* Memory control - a TRUE indicates that the 256-byte page is writeable.
*/
typedef int Z80MemoryControl[256];
/* Interfaces needed to handle ports (IN/OUT commands)
*/
typedef Z80Byte (*Z80ReadPort)(Z80 *cpu, Z80Word address);
typedef void (*Z80WritePort)(Z80 *cpu, Z80Word address, Z80Byte value);
/* Callback. Callback should return TRUE for processing to continue.
*/
typedef int (*Z80Callback)(Z80 *cpu, Z80Val data);
/* Callback reasons
eZ80_Instruction Called before the initial fetch for an instruction
(called just to once no matter how many bytes the
instruction is made up of).
eZ80_EDHook Called when an undefined ED opcode is executed.
eZ80_Halt Called when the HALT instruction is hit and released.
eZ80_RETI Called when the RETI instruction is executed
*/
typedef enum
{
eZ80_Instruction, /* data = no cycles since reset */
eZ80_EDHook, /* data = byte after ED opcode (only for NOP opcodes) */
eZ80_Halt, /* data = 1 halt raised, 0 halt cleared by int */
eZ80_RETI, /* data = ignored */
eZ80_NO_CALLBACK /* leave at end */
} Z80CallbackReason;
/* Get/settable state of the Z80
*/
typedef struct
{
Z80Word PC;
Z80Word SP;
Z80Val cycle;
Z80Word AF;
Z80Word BC;
Z80Word DE;
Z80Word HL;
Z80Word AF_; /* Alternate registers */
Z80Word BC_;
Z80Word DE_;
Z80Word HL_;
Z80Word IX;
Z80Word IY;
Z80Byte IFF1;
Z80Byte IFF2;
Z80Byte IM;
Z80Byte I;
Z80Byte R;
} Z80State;
/* Flags in the F register
*/
typedef enum
{
eZ80_Carry =0x01,
eZ80_Neg =0x02,
eZ80_PV =0x04,
eZ80_Hidden3 =0x08,
eZ80_HalfCarry =0x10,
eZ80_Hidden5 =0x20,
eZ80_Zero =0x40,
eZ80_Sign =0x80
} Z80FlagRegister;
/* Disassembly label -- only useful if ENABLE_DISASSEMBLER is set.
Labels are stored as an array, where a NULL in the label field marks
the end of the list.
*/
typedef struct
{
Z80Word address;
const char *label;
} Z80Label;
/* ---------------------------------------- INTERFACES
*/
/* Initialises the processor.
*/
Z80 *Z80Init(Z80Memory memory,
Z80MemoryControl memcontrol,
Z80WritePort write_port,
Z80ReadPort read_port);
/* Resets the processor.
*/
void Z80Reset(Z80 *cpu);
/* Sets the PC
*/
void Z80SetPC(Z80 *cpu, Z80Word PC);
/* Gets the PC
*/
Z80Word Z80GetPC(Z80 *cpu);
/* Sets the cycle count to the specified count
*/
void Z80ResetCycles(Z80 *cpu, Z80Val cycles);
/* Lodge a callback to be invoked after special events. Returns FALSE
if the callback couldn't be lodged (there is a max of 10 callbacks per
reason).
*/
int Z80LodgeCallback(Z80 *cpu,
Z80CallbackReason reason,
Z80Callback callback);
/* Remove a callback. Does nothing if reason was not lodged with
Z80LodgeCallback()
*/
void Z80RemoveCallback(Z80 *cpu,
Z80CallbackReason reason,
Z80Callback callback);
/* Cause an interrupt before the next opcode.
devbyte is the byte generated by the device (if any).
*/
void Z80Interrupt(Z80 *cpu, Z80Byte devbyte);
/* Cause an NMI
*/
void Z80NMI(Z80 *cpu);
/* Execute a single instruction. Returns FALSE if any callback returned
FALSE.
*/
int Z80SingleStep(Z80 *cpu);
/* Executes until a callback returns FALSE (never returns otherwise)
*/
void Z80Exec(Z80 *cpu);
/* Interrogate the state of the Z80
*/
Z80Val Z80Cycles(Z80 *cpu);
void Z80GetState(Z80 *cpu, Z80State *state);
void Z80SetState(Z80 *cpu, const Z80State *state);
/* Set address to label mappings for the disassembler
*/
void Z80SetLabels(Z80Label labels[]);
/* Simple disassembly. addr is updated on exit.
*/
const char *Z80Disassemble(Z80 *cpu, Z80Word *addr);
#endif
/* END OF FILE */
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