diff options
Diffstat (limited to 'z80.h')
| -rw-r--r-- | z80.h | 57 |
1 files changed, 44 insertions, 13 deletions
@@ -2,11 +2,11 @@ z80 - Z80 emulation - Copyright (C) 2006 Ian Cowburn <ianc@noddybox.co.uk> + Copyright (C) 2021 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 + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -15,8 +15,7 @@ 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 + along with this program; if not, see <http://www.gnu.org/licenses/> ------------------------------------------------------------------------- @@ -27,6 +26,8 @@ #ifndef Z80_H #define Z80_H "$Id$" +#include <stdio.h> + /* Configuration */ #include "z80_config.h" @@ -55,20 +56,30 @@ typedef signed char Z80Relative; typedef unsigned short Z80Word; -/* A Z80 16-bit register. To access the HI/LO component use the indexes - Z80_HI_WORD and Z80_LO_WORD which will be initialised once Z80Init has been - called. +/* A Z80 16-bit register made up of 2 8-bit registers. */ +#ifdef Z80_LITTLE_ENDIAN +typedef struct +{ + Z80Byte lo; + Z80Byte hi; +} Z80RegPair; +#endif + +#ifdef Z80_BIG_ENDIAN +typedef struct +{ + Z80Byte hi; + Z80Byte lo; +} Z80RegPair; +#endif + typedef union { Z80Word w; - Z80Byte b[2]; + Z80RegPair b; } Z80Reg; -extern int Z80_HI_WORD; -extern int Z80_LO_WORD; - - /* The processor */ struct Z80Private; @@ -133,13 +144,23 @@ typedef int (*Z80Callback)(Z80 *cpu, Z80Val data); */ typedef enum { - eZ80_Instruction, /* data = no cycles since reset */ + eZ80_Instruction, /* data = cycles as returned by Z80Cycles */ 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; +/* Defines cycle timers +*/ +typedef enum +{ + Z80_TIMER_1, + Z80_TIMER_2, + Z80_TIMER_3, + Z80_NO_TIMERS +} Z80Timer; + /* Flags in the F register */ @@ -234,6 +255,11 @@ void Z80Exec(Z80 *cpu); Z80Val Z80Cycles(Z80 *cpu); void Z80ResetCycles(Z80 *cpu, Z80Val cycles); +/* Timers that count in cycle counts +*/ +Z80Val Z80GetTimer(Z80 *cpu, Z80Timer timer); +void Z80SetTimer(Z80 *cpu, Z80Timer timer, Z80Val cycles); + /* Set address to label mappings for the disassembler */ @@ -245,6 +271,11 @@ void Z80SetLabels(Z80Label labels[]); */ const char *Z80Disassemble(Z80 *cpu, Z80Word *addr); +/* Allows the CPU state to be saved/loaded from a stream +*/ +void Z80SaveSnapshot(Z80 *cpu, FILE *fp); +void Z80LoadSnapshot(Z80 *cpu, FILE *fp); + #endif /* END OF FILE */ |