kolibrios/programs/emulator/dgen-sdl-1.33/cyclone/Cyclone.h
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2022-06-15 18:25:17 +00:00

100 lines
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C

// Cyclone 68000 Emulator - Header File
// Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)
// Copyright (c) 2005-2011 Gražvydas "notaz" Ignotas (notasas (at) gmail.com)
// This code is licensed under the GNU General Public License version 2.0 and the MAME License.
// You can choose the license that has the most advantages for you.
// SVN repository can be found at http://code.google.com/p/cyclone68000/
#ifndef __CYCLONE_H__
#define __CYCLONE_H__
#ifdef __cplusplus
extern "C" {
#endif
extern int CycloneVer; // Version number of library
struct Cyclone
{
unsigned int d[8]; // [r7,#0x00]
unsigned int a[8]; // [r7,#0x20]
unsigned int pc; // [r7,#0x40] Memory Base (.membase) + 68k PC
unsigned char srh; // [r7,#0x44] Status Register high (T_S__III)
unsigned char unused; // [r7,#0x45] Unused
unsigned char flags; // [r7,#0x46] Flags (ARM order: ____NZCV) [68k order is XNZVC]
unsigned char irq; // [r7,#0x47] IRQ level
unsigned int osp; // [r7,#0x48] Other Stack Pointer (USP/SSP)
unsigned int xc; // [r7,#0x4c] Extend flag (bit29: ??X? _)
unsigned int prev_pc; // [r7,#0x50] Set to start address of currently executed opcode + 2 (if enabled in config.h)
unsigned int jumptab; // [r7,#0x54] Jump table pointer
int state_flags; // [r7,#0x58] bit: 0: stopped state, 1: trace state, 2: activity bit, 3: addr error, 4: fatal halt
int cycles; // [r7,#0x5c] Number of cycles to execute - 1. Updates to cycles left after CycloneRun()
int membase; // [r7,#0x60] Memory Base (ARM address minus 68000 address)
unsigned int (*checkpc)(unsigned int pc); // [r7,#0x64] called to recalc Memory Base+pc
unsigned int (*read8 )(unsigned int a); // [r7,#0x68]
unsigned int (*read16 )(unsigned int a); // [r7,#0x6c]
unsigned int (*read32 )(unsigned int a); // [r7,#0x70]
void (*write8 )(unsigned int a,unsigned char d); // [r7,#0x74]
void (*write16)(unsigned int a,unsigned short d); // [r7,#0x78]
void (*write32)(unsigned int a,unsigned int d); // [r7,#0x7c]
unsigned int (*fetch8 )(unsigned int a); // [r7,#0x80]
unsigned int (*fetch16)(unsigned int a); // [r7,#0x84]
unsigned int (*fetch32)(unsigned int a); // [r7,#0x88]
int (*IrqCallback)(int int_level); // [r7,#0x8c] optional irq callback function, see config.h
void (*ResetCallback)(void); // [r7,#0x90] if enabled in config.h, calls this whenever RESET opcode is encountered.
int (*UnrecognizedCallback)(void); // [r7,#0x94] if enabled in config.h, calls this whenever unrecognized opcode is encountered.
unsigned int internal[6]; // [r7,#0x98] reserved for internal use, do not change.
};
// Initialize. Used only if Cyclone was compiled with compressed jumptable, see config.h
void CycloneInit(void);
// Reset
void CycloneReset(struct Cyclone *pcy);
// Run cyclone. Cycles should be specified in context (pcy->cycles)
void CycloneRun(struct Cyclone *pcy);
// Utility functions to get and set SR
void CycloneSetSr(struct Cyclone *pcy, unsigned int sr);
unsigned int CycloneGetSr(const struct Cyclone *pcy);
// Generates irq exception if needed (if pcy->irq > mask).
// Returns cycles used for exception if it was generated, 0 otherwise.
int CycloneFlushIrq(struct Cyclone *pcy);
// Functions for saving and restoring state.
// CycloneUnpack() uses checkpc(), so it must be initialized.
// save_buffer must point to buffer of 128 (0x80) bytes of size.
void CyclonePack(const struct Cyclone *pcy, void *save_buffer);
void CycloneUnpack(struct Cyclone *pcy, const void *save_buffer);
// genesis: if 1, switch to normal TAS handlers
void CycloneSetRealTAS(int use_real);
// These values are special return values for IrqCallback.
// Causes an interrupt autovector (0x18 + interrupt level) to be taken.
// This happens in a real 68K if VPA or AVEC is asserted during an interrupt
// acknowledge cycle instead of DTACK (the most common situation).
#define CYCLONE_INT_ACK_AUTOVECTOR -1
// Causes the spurious interrupt vector (0x18) to be taken
// This happens in a real 68K if BERR is asserted during the interrupt
// acknowledge cycle (i.e. no devices responded to the acknowledge).
#define CYCLONE_INT_ACK_SPURIOUS -2
#ifdef __cplusplus
} // End of extern "C"
#endif
#endif // __CYCLONE_H__