re-import all libretro code from it's fork

[picodrive.git] / cpu / sh2 / sh2.h

#ifndef __SH2_H__\r
#define __SH2_H__\r
\r
#if !defined(REGPARM) && defined(__i386__) \r
#define REGPARM(x) __attribute__((regparm(x)))\r
#else\r
#define REGPARM(x)\r
#endif\r
\r
// registers - matches structure order\r
typedef enum {\r
  SHR_R0 = 0, SHR_SP = 15,\r
  SHR_PC,  SHR_PPC, SHR_PR,   SHR_SR,\r
  SHR_GBR, SHR_VBR, SHR_MACH, SHR_MACL,\r
} sh2_reg_e;\r
\r
typedef struct SH2_\r
{\r
	unsigned int	r[16];		// 00\r
	unsigned int	pc;		// 40\r
	unsigned int	ppc;\r
	unsigned int	pr;\r
	unsigned int	sr;\r
	unsigned int	gbr, vbr;	// 50\r
	unsigned int	mach, macl;	// 58\r
\r
	// common\r
	const void	*read8_map;	// 60\r
	const void	*read16_map;\r
	const void	**write8_tab;\r
	const void	**write16_tab;\r
\r
	// drc stuff\r
	int		drc_tmp;	// 70\r
	int		irq_cycles;\r
	void		*p_bios;	// convenience pointers\r
	void		*p_da;\r
	void		*p_sdram;	// 80\r
	void		*p_rom;\r
	unsigned int	pdb_io_csum[2];\r
\r
#define SH2_STATE_RUN   (1 << 0)	// to prevent recursion\r
#define SH2_STATE_SLEEP (1 << 1)\r
#define SH2_STATE_CPOLL (1 << 2)	// polling comm regs\r
#define SH2_STATE_VPOLL (1 << 3)	// polling VDP\r
	unsigned int	state;\r
	unsigned int	poll_addr;\r
	int		poll_cycles;\r
	int		poll_cnt;\r
\r
	// interpreter stuff\r
	int		icount;		// cycles left in current timeslice\r
	unsigned int	ea;\r
	unsigned int	delay;\r
	unsigned int	test_irq;\r
\r
	int	pending_level;		// MAX(pending_irl, pending_int_irq)\r
	int	pending_irl;\r
	int	pending_int_irq;	// internal irq\r
	int	pending_int_vector;\r
	int	REGPARM(2) (*irq_callback)(struct SH2_ *sh2, int level);\r
	int	is_slave;\r
\r
	unsigned int	cycles_timeslice;\r
\r
	struct SH2_	*other_sh2;\r
\r
	// we use 68k reference cycles for easier sync\r
	unsigned int	m68krcycles_done;\r
	unsigned int	mult_m68k_to_sh2;\r
	unsigned int	mult_sh2_to_m68k;\r
\r
	unsigned char	data_array[0x1000]; // cache (can be used as RAM)\r
	unsigned int	peri_regs[0x200/4]; // periphereal regs\r
} SH2;\r
\r
#define CYCLE_MULT_SHIFT 10\r
#define C_M68K_TO_SH2(xsh2, c) \\r
	((int)((c) * (xsh2).mult_m68k_to_sh2) >> CYCLE_MULT_SHIFT)\r
#define C_SH2_TO_M68K(xsh2, c) \\r
	((int)((c + 3) * (xsh2).mult_sh2_to_m68k) >> CYCLE_MULT_SHIFT)\r
\r
int  sh2_init(SH2 *sh2, int is_slave, SH2 *other_sh2);\r
void sh2_finish(SH2 *sh2);\r
void sh2_reset(SH2 *sh2);\r
int  sh2_irl_irq(SH2 *sh2, int level, int nested_call);\r
void sh2_internal_irq(SH2 *sh2, int level, int vector);\r
void sh2_do_irq(SH2 *sh2, int level, int vector);\r
void sh2_pack(const SH2 *sh2, unsigned char *buff);\r
void sh2_unpack(SH2 *sh2, const unsigned char *buff);\r
\r
int  sh2_execute_drc(SH2 *sh2c, int cycles);\r
int  sh2_execute_interpreter(SH2 *sh2c, int cycles);\r
\r
static inline int sh2_execute(SH2 *sh2, int cycles, int use_drc)\r
{\r
  int ret;\r
\r
  sh2->cycles_timeslice = cycles;\r
#ifdef DRC_SH2\r
  if (use_drc)\r
    ret = sh2_execute_drc(sh2, cycles);\r
  else\r
#endif\r
    ret = sh2_execute_interpreter(sh2, cycles);\r
\r
  return sh2->cycles_timeslice - ret;\r
}\r
\r
// regs, pending_int*, cycles, reserved\r
#define SH2_STATE_SIZE ((24 + 2 + 2 + 12) * 4)\r
\r
// pico memhandlers\r
// XXX: move somewhere else\r
unsigned int REGPARM(2) p32x_sh2_read8(unsigned int a, SH2 *sh2);\r
unsigned int REGPARM(2) p32x_sh2_read16(unsigned int a, SH2 *sh2);\r
unsigned int REGPARM(2) p32x_sh2_read32(unsigned int a, SH2 *sh2);\r
void REGPARM(3) p32x_sh2_write8 (unsigned int a, unsigned int d, SH2 *sh2);\r
void REGPARM(3) p32x_sh2_write16(unsigned int a, unsigned int d, SH2 *sh2);\r
void REGPARM(3) p32x_sh2_write32(unsigned int a, unsigned int d, SH2 *sh2);\r
\r
// debug\r
#ifdef DRC_CMP\r
void do_sh2_trace(SH2 *current, int cycles);\r
void do_sh2_cmp(SH2 *current);\r
#endif\r
\r
#endif /* __SH2_H__ */\r