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dpavlin |
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/** Z80: portable Z80 emulator *******************************/ |
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/** **/ |
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/** Z80.h **/ |
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/** **/ |
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/** This file contains declarations relevant to emulation **/ |
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/** of Z80 CPU. **/ |
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/** **/ |
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/** Copyright (C) Marat Fayzullin 1994-2007 **/ |
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/** You are not allowed to distribute this software **/ |
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/** commercially. Please, notify me, if you make any **/ |
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/** changes to this file. **/ |
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/*************************************************************/ |
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#ifndef Z80_H |
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#define Z80_H |
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/* Compilation options: */ |
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/* #define DEBUG */ /* Compile debugging version */ |
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/* #define LSB_FIRST */ /* Compile for low-endian CPU */ |
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/* #define MSB_FIRST */ /* Compile for hi-endian CPU */ |
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/* LoopZ80() may return: */ |
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#define INT_RST00 0x00C7 /* RST 00h */ |
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#define INT_RST08 0x00CF /* RST 08h */ |
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#define INT_RST10 0x00D7 /* RST 10h */ |
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#define INT_RST18 0x00DF /* RST 18h */ |
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#define INT_RST20 0x00E7 /* RST 20h */ |
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#define INT_RST28 0x00EF /* RST 28h */ |
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#define INT_RST30 0x00F7 /* RST 30h */ |
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#define INT_RST38 0x00FF /* RST 38h */ |
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#define INT_IRQ INT_RST38 /* Default IRQ opcode is FFh */ |
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#define INT_NMI 0xFFFD /* Non-maskable interrupt */ |
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#define INT_NONE 0xFFFF /* No interrupt required */ |
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#define INT_QUIT 0xFFFE /* Exit the emulation */ |
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/* Bits in Z80 F register: */ |
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#define S_FLAG 0x80 /* 1: Result negative */ |
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#define Z_FLAG 0x40 /* 1: Result is zero */ |
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#define H_FLAG 0x10 /* 1: Halfcarry/Halfborrow */ |
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#define P_FLAG 0x04 /* 1: Result is even */ |
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#define V_FLAG 0x04 /* 1: Overflow occured */ |
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#define N_FLAG 0x02 /* 1: Subtraction occured */ |
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#define C_FLAG 0x01 /* 1: Carry/Borrow occured */ |
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/* Bits in IFF flip-flops: */ |
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#define IFF_1 0x01 /* IFF1 flip-flop */ |
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#define IFF_IM1 0x02 /* 1: IM1 mode */ |
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#define IFF_IM2 0x04 /* 1: IM2 mode */ |
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#define IFF_2 0x08 /* IFF2 flip-flop */ |
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#define IFF_EI 0x20 /* 1: EI pending */ |
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#define IFF_HALT 0x80 /* 1: CPU HALTed */ |
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/** Simple Datatypes *****************************************/ |
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/** NOTICE: sizeof(byte)=1 and sizeof(word)=2 **/ |
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/*************************************************************/ |
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#ifndef BYTE_TYPE_DEFINED |
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#define BYTE_TYPE_DEFINED |
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typedef unsigned char byte; |
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#endif |
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#ifndef WORD_TYPE_DEFINED |
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#define WORD_TYPE_DEFINED |
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typedef unsigned short word; |
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#endif |
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typedef signed char offset; |
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/** Structured Datatypes *************************************/ |
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/** NOTICE: #define LSB_FIRST for machines where least **/ |
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/** signifcant byte goes first. **/ |
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/*************************************************************/ |
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typedef union |
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{ |
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#ifdef LSB_FIRST |
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struct { byte l,h; } B; |
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#else |
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struct { byte h,l; } B; |
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#endif |
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word W; |
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} pair; |
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typedef struct |
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{ |
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pair AF,BC,DE,HL,IX,IY,PC,SP; /* Main registers */ |
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pair AF1,BC1,DE1,HL1; /* Shadow registers */ |
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byte IFF,I; /* Interrupt registers */ |
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byte R; /* Refresh register */ |
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int IPeriod,ICount; /* Set IPeriod to number of CPU cycles */ |
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/* between calls to LoopZ80() */ |
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int IBackup; /* Private, don't touch */ |
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word IRequest; /* Set to address of pending IRQ */ |
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byte IAutoReset; /* Set to 1 to autom. reset IRequest */ |
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byte TrapBadOps; /* Set to 1 to warn of illegal opcodes */ |
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word Trap; /* Set Trap to address to trace from */ |
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byte Trace; /* Set Trace=1 to start tracing */ |
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void *User; /* Arbitrary user data (ID,RAM*,etc.) */ |
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} Z80; |
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/** ResetZ80() ***********************************************/ |
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/** This function can be used to reset the registers before **/ |
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/** starting execution with RunZ80(). It sets registers to **/ |
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/** their initial values. **/ |
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/*************************************************************/ |
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void ResetZ80(register Z80 *R); |
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/** ExecZ80() ************************************************/ |
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/** This function will execute given number of Z80 cycles. **/ |
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/** It will then return the number of cycles left, possibly **/ |
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/** negative, and current register values in R. **/ |
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/*************************************************************/ |
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#ifdef EXECZ80 |
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int ExecZ80(register Z80 *R,register int RunCycles); |
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#endif |
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/** IntZ80() *************************************************/ |
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/** This function will generate interrupt of given vector. **/ |
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/*************************************************************/ |
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void IntZ80(register Z80 *R,register word Vector); |
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/** RunZ80() *************************************************/ |
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/** This function will run Z80 code until an LoopZ80() call **/ |
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/** returns INT_QUIT. It will return the PC at which **/ |
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/** emulation stopped, and current register values in R. **/ |
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/*************************************************************/ |
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#ifndef EXECZ80 |
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word RunZ80(register Z80 *R); |
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#endif |
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/** RdZ80()/WrZ80() ******************************************/ |
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/** These functions are called when access to RAM occurs. **/ |
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/** They allow to control memory access. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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void WrZ80(register word Addr,register byte Value); |
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byte RdZ80(register word Addr); |
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/** InZ80()/OutZ80() *****************************************/ |
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/** Z80 emulation calls these functions to read/write from **/ |
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/** I/O ports. There can be 65536 I/O ports, but only first **/ |
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/** 256 are usually used. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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void OutZ80(register word Port,register byte Value); |
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byte InZ80(register word Port); |
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/** PatchZ80() ***********************************************/ |
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/** Z80 emulation calls this function when it encounters a **/ |
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/** special patch command (ED FE) provided for user needs. **/ |
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/** For example, it can be called to emulate BIOS calls, **/ |
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/** such as disk and tape access. Replace it with an empty **/ |
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/** macro for no patching. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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void PatchZ80(register Z80 *R); |
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/** DebugZ80() ***********************************************/ |
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/** This function should exist if DEBUG is #defined. When **/ |
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/** Trace!=0, it is called after each command executed by **/ |
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/** the CPU, and given the Z80 registers. Emulation exits **/ |
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/** if DebugZ80() returns 0. **/ |
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/*************************************************************/ |
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#ifdef DEBUG |
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byte DebugZ80(register Z80 *R); |
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#endif |
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/** LoopZ80() ************************************************/ |
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/** Z80 emulation calls this function periodically to check **/ |
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/** if the system hardware requires any interrupts. This **/ |
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/** function must return an address of the interrupt vector **/ |
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/** (0x0038, 0x0066, etc.) or INT_NONE for no interrupt. **/ |
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/** Return INT_QUIT to exit the emulation loop. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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word LoopZ80(register Z80 *R); |
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/** JumpZ80() ************************************************/ |
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/** Z80 emulation calls this function when it executes a **/ |
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/** JP, JR, CALL, RST, or RET. You can use JumpZ80() to **/ |
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/** trap these opcodes and switch memory layout. **/ |
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/************************************ TO BE WRITTEN BY USER **/ |
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#ifndef JUMPZ80 |
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#define JumpZ80(PC) |
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#else |
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void JumpZ80(word PC); |
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#endif |
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#endif /* Z80_H */ |
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