[picodrive.git] / Pico / carthw / svp / ssp16.h

// basic, incomplete SSP160x (SSP1601?) interpreter

// (c) Copyright 2008, Grazvydas "notaz" Ignotas
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.


// 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 {
		unsigned short l;
		unsigned short h;
	};
} ssp_reg_t;

typedef struct
{
	union {
		unsigned short RAM[256*2];	// 000 2 internal RAM banks
		struct {
			unsigned short RAM0[256];
			unsigned short RAM1[256];
		};
	};
	ssp_reg_t gr[16];			// 400 general registers
	union {
		unsigned char r[8];		// 440 BANK pointers
		struct {
			unsigned char r0[4];
			unsigned char r1[4];
		};
	};
	unsigned short stack[6];		// 448
	unsigned int pmac_read[6];		// 454 read modes/addrs for PM0-PM5
	unsigned int pmac_write[6];		// 46c write ...
	//
	#define SSP_PMC_HAVE_ADDR	0x0001	// address written to PMAC, waiting for mode
	#define SSP_PMC_SET		0x0002	// PMAC is set
	#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		0xe000
	unsigned int emu_status;		// 484
	unsigned int pad[30];
} ssp1601_t;


void ssp1601_reset(ssp1601_t *ssp);
void ssp1601_run(int cycles);
Commit	Line	Data
	1	// basic, incomplete SSP160x (SSP1601?) interpreter
	2
	3	// (c) Copyright 2008, Grazvydas "notaz" Ignotas
	4	// Free for non-commercial use.
	5
	6	// For commercial use, separate licencing terms must be obtained.
	7
	8
	9	// register names
	10	enum {
	11	SSP_GR0, SSP_X, SSP_Y, SSP_A,
	12	SSP_ST, SSP_STACK, SSP_PC, SSP_P,
	13	SSP_PM0, SSP_PM1, SSP_PM2, SSP_XST,
	14	SSP_PM4, SSP_gr13, SSP_PMC, SSP_AL
	15	};
	16
	17	typedef union
	18	{
	19	unsigned int v;
	20	struct {
	21	unsigned short l;
	22	unsigned short h;
	23	};
	24	} ssp_reg_t;
	25
	26	typedef struct
	27	{
	28	union {
	29	unsigned short RAM[256*2]; // 000 2 internal RAM banks
	30	struct {
	31	unsigned short RAM0[256];
	32	unsigned short RAM1[256];
	33	};
	34	};
	35	ssp_reg_t gr[16]; // 400 general registers
	36	union {
	37	unsigned char r[8]; // 440 BANK pointers
	38	struct {
	39	unsigned char r0[4];
	40	unsigned char r1[4];
	41	};
	42	};
	43	unsigned short stack[6]; // 448
	44	unsigned int pmac_read[6]; // 454 read modes/addrs for PM0-PM5
	45	unsigned int pmac_write[6]; // 46c write ...
	46	//
	47	#define SSP_PMC_HAVE_ADDR 0x0001 // address written to PMAC, waiting for mode
	48	#define SSP_PMC_SET 0x0002 // PMAC is set
	49	#define SSP_WAIT_PM0 0x2000 // bit1 in PM0
	50	#define SSP_WAIT_30FE06 0x4000 // ssp tight loops on 30FE08 to become non-zero
	51	#define SSP_WAIT_30FE08 0x8000 // same for 30FE06
	52	#define SSP_WAIT_MASK 0xe000
	53	unsigned int emu_status; // 484
	54	unsigned int pad[30];
	55	} ssp1601_t;
	56
	57
	58	void ssp1601_reset(ssp1601_t *ssp);
	59	void ssp1601_run(int cycles);
	60