Genesis-Plus-GX/source/cart_hw/svp/ssp16.h
2008-12-11 17:38:29 +00:00

83 lines
2.0 KiB
C

/* The SVP chip emulator
(c) Copyright 2008, Grazvydas "notaz" Ignotas
Free for non-commercial use.
For commercial use, separate licencing terms must be obtained.
*/
/* modified for Genesis Plus GCN port, added BIG ENDIAN support (EkeEke)*/
#ifndef _SSP16_H_
#define _SSP16_H_
/* emulation event logging (from Picodrive) */
#define EL_SVP 0x00004000 /* SVP stuff */
#define EL_ANOMALY 0x80000000 /* some unexpected conditions (during emulation) */
#ifdef LOG_SVP
#define elprintf(w,f,...) error("%d(%d): " f "\n",frame_count,v_counter,##__VA_ARGS__);
#else
#define elprintf(w,f,...)
#endif
/* register names */
enum {
SSP_GR0, SSP_X, SSP_Y, SSP_A,
SSP_ST, SSP_STACK, SSP_PC, SSP_P,
SSP_PM0, SSP_PM1, SSP_PM2, SSP_XST,
SSP_PM4, SSP_gr13, SSP_PMC, SSP_AL
};
typedef union
{
unsigned int v;
struct {
#ifdef LSB_FIRST
unsigned short l;
unsigned short h;
#else
unsigned short h;
unsigned short l;
#endif
};
} ssp_reg_t;
typedef struct
{
union {
unsigned short RAM[256*2]; // 2 internal RAM banks
struct {
unsigned short RAM0[256];
unsigned short RAM1[256];
};
};
ssp_reg_t gr[16]; // general registers
union {
unsigned char r[8]; // BANK pointers
struct {
unsigned char r0[4];
unsigned char r1[4];
};
};
unsigned short stack[6];
unsigned int pmac_read[6]; // read modes/addrs for PM0-PM5
unsigned int pmac_write[6]; // write ...
#define SSP_PMC_HAVE_ADDR 0x0001 // address written to PMAC, waiting for mode
#define SSP_PMC_SET 0x0002 // PMAC is set
#define SSP_HANG 0x1000 // 68000 hangs SVP
#define SSP_WAIT_PM0 0x2000 // bit1 in PM0
#define SSP_WAIT_30FE06 0x4000 // ssp tight loops on 30FE08 to become non-zero
#define SSP_WAIT_30FE08 0x8000 // same for 30FE06
#define SSP_WAIT_MASK 0xf000
unsigned int emu_status;
unsigned int pad[30];
} ssp1601_t;
void ssp1601_reset(ssp1601_t *ssp);
void ssp1601_run(int cycles);
#endif