/***************************************************************************

    mips3com.h

    Common MIPS III/IV definitions and functions

***************************************************************************/

#pragma once

#ifndef __MIPS3COM_H__
#define __MIPS3COM_H__

#include "cpuintrf.h"
#include "mips3.h"
#include "cpu/vtlb.h"
#include "timer.h"


/***************************************************************************
    CONSTANTS
***************************************************************************/

/* core parameters */
#define MIPS3_MIN_PAGE_SHIFT		12
#define MIPS3_MIN_PAGE_SIZE			(1 << MIPS3_MIN_PAGE_SHIFT)
#define MIPS3_MIN_PAGE_MASK			(MIPS3_MIN_PAGE_SIZE - 1)
#define MIPS3_MAX_PADDR_SHIFT		32
#define MIPS3_MAX_TLB_ENTRIES		48

/* cycle parameters */
#define MIPS3_COUNT_READ_CYCLES		250
#define MIPS3_CAUSE_READ_CYCLES		250

/* MIPS flavors */
enum _mips3_flavor
{
	/* MIPS III variants */
	MIPS3_TYPE_MIPS_III,
	MIPS3_TYPE_VR4300,
	MIPS3_TYPE_R4600,
	MIPS3_TYPE_R4650,
	MIPS3_TYPE_R4700,

	/* MIPS IV variants */
	MIPS3_TYPE_MIPS_IV,
	MIPS3_TYPE_R5000,
	MIPS3_TYPE_QED5271,
	MIPS3_TYPE_RM7000
};
typedef enum _mips3_flavor mips3_flavor;

/* TLB bits */
#define TLB_GLOBAL				0x01
#define TLB_VALID				0x02
#define TLB_DIRTY				0x04
#define TLB_PRESENT				0x08

/* COP0 registers */
#define COP0_Index				0
#define COP0_Random				1
#define COP0_EntryLo			2
#define COP0_EntryLo0			2
#define COP0_EntryLo1			3
#define COP0_Context			4
#define COP0_PageMask			5
#define COP0_Wired				6
#define COP0_BadVAddr			8
#define COP0_Count				9
#define COP0_EntryHi			10
#define COP0_Compare			11
#define COP0_Status				12
#define COP0_Cause				13
#define COP0_EPC				14
#define COP0_PRId				15
#define COP0_Config				16
#define COP0_LLAddr				17
#define COP0_XContext			20
#define COP0_ECC				26
#define COP0_CacheErr			27
#define COP0_TagLo				28
#define COP0_TagHi				29
#define COP0_ErrorPC			30

/* Status register bits */
#define SR_IE					0x00000001
#define SR_EXL					0x00000002
#define SR_ERL					0x00000004
#define SR_KSU_MASK				0x00000018
#define SR_KSU_KERNEL			0x00000000
#define SR_KSU_SUPERVISOR		0x00000008
#define SR_KSU_USER				0x00000010
#define SR_IMSW0				0x00000100
#define SR_IMSW1				0x00000200
#define SR_IMEX0				0x00000400
#define SR_IMEX1				0x00000800
#define SR_IMEX2				0x00001000
#define SR_IMEX3				0x00002000
#define SR_IMEX4				0x00004000
#define SR_IMEX5				0x00008000
#define SR_DE					0x00010000
#define SR_CE					0x00020000
#define SR_CH					0x00040000
#define SR_SR					0x00100000
#define SR_TS					0x00200000
#define SR_BEV					0x00400000
#define SR_ITS					0x01000000	/* VR4300 only, Application Note doesn't give purpose */
#define SR_RE					0x02000000
#define SR_FR					0x04000000
#define SR_RP					0x08000000
#define SR_COP0					0x10000000
#define SR_COP1					0x20000000
#define SR_COP2					0x40000000
#define SR_COP3					0x80000000

/* exception types */
#define EXCEPTION_INTERRUPT		0
#define EXCEPTION_TLBMOD		1
#define EXCEPTION_TLBLOAD		2
#define EXCEPTION_TLBSTORE		3
#define EXCEPTION_ADDRLOAD		4
#define EXCEPTION_ADDRSTORE		5
#define EXCEPTION_BUSINST		6
#define EXCEPTION_BUSDATA		7
#define EXCEPTION_SYSCALL		8
#define EXCEPTION_BREAK			9
#define EXCEPTION_INVALIDOP		10
#define EXCEPTION_BADCOP		11
#define EXCEPTION_OVERFLOW		12
#define EXCEPTION_TRAP			13
#define EXCEPTION_TLBLOAD_FILL	16
#define EXCEPTION_TLBSTORE_FILL	17
#define EXCEPTION_COUNT			18



/***************************************************************************
    HELPER MACROS
***************************************************************************/

#define REG_LO			32
#define REG_HI			33

#define RSREG			((op >> 21) & 31)
#define RTREG			((op >> 16) & 31)
#define RDREG			((op >> 11) & 31)
#define SHIFT			((op >> 6) & 31)

#define FRREG			((op >> 21) & 31)
#define FTREG			((op >> 16) & 31)
#define FSREG			((op >> 11) & 31)
#define FDREG			((op >> 6) & 31)

#define IS_SINGLE(o) 	(((o) & (1 << 21)) == 0)
#define IS_DOUBLE(o) 	(((o) & (1 << 21)) != 0)
#define IS_FLOAT(o) 	(((o) & (1 << 23)) == 0)
#define IS_INTEGRAL(o) 	(((o) & (1 << 23)) != 0)

#define SIMMVAL			((INT16)op)
#define UIMMVAL			((UINT16)op)
#define LIMMVAL			(op & 0x03ffffff)



/***************************************************************************
    STRUCTURES & TYPEDEFS
***************************************************************************/

/* MIPS3 TLB entry */
typedef struct _mips3_tlb_entry mips3_tlb_entry;
struct _mips3_tlb_entry
{
	UINT64			page_mask;
	UINT64			entry_hi;
	UINT64			entry_lo[2];
};


/* forward declaration of implementation-specific state */
typedef struct _mips3imp_state mips3imp_state;


/* MIPS3 state */
typedef struct _mips3_state mips3_state;
struct _mips3_state
{
	/* core registers */
	UINT32			pc;
	int				icount;
	UINT64			r[35];

	/* COP registers */
	UINT64			cpr[3][32];
	UINT64			ccr[3][32];
	UINT32			llbit;

	/* internal stuff */
	mips3_flavor	flavor;
	cpu_irq_callback irq_callback;
	const device_config *device;
	const address_space *program;
	UINT32			system_clock;
	UINT32			cpu_clock;
	UINT64			count_zero_time;
	UINT32			compare_armed;
	emu_timer *		compare_int_timer;

	/* derived info based on flavor */
	UINT32			pfnmask;
	UINT8			tlbentries;

	/* memory accesses */
	UINT8			bigendian;
	data_accessors	memory;

	/* cache memory */
	size_t			icache_size;
	size_t			dcache_size;

	/* MMU */
	vtlb_state *	vtlb;
	mips3_tlb_entry tlb[MIPS3_MAX_TLB_ENTRIES];

	/* for use by specific implementations */
	mips3imp_state *impstate;
};



/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

void mips3com_init(mips3_state *mips, mips3_flavor flavor, int bigendian, const device_config *device, cpu_irq_callback irqcallback);
void mips3com_exit(mips3_state *mips);

void mips3com_reset(mips3_state *mips);
offs_t mips3com_dasm(mips3_state *mips, char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram);
void mips3com_update_cycle_counting(mips3_state *mips);

void mips3com_asid_changed(mips3_state *mips);
int mips3com_translate_address(mips3_state *mips, int space, int intention, offs_t *address);
void mips3com_tlbr(mips3_state *mips);
void mips3com_tlbwi(mips3_state *mips);
void mips3com_tlbwr(mips3_state *mips);
void mips3com_tlbp(mips3_state *mips);

void mips3com_set_info(mips3_state *mips, UINT32 state, cpuinfo *info);
void mips3com_get_info(mips3_state *mips, UINT32 state, cpuinfo *info);



/***************************************************************************
    INLINE FUNCTIONS
***************************************************************************/

/*-------------------------------------------------
    mips3com_set_irq_line - set or clear the given
    IRQ line
-------------------------------------------------*/

INLINE void mips3com_set_irq_line(mips3_state *mips, int irqline, int state)
{
	if (state != CLEAR_LINE)
		mips->cpr[0][COP0_Cause] |= 0x400 << irqline;
	else
		mips->cpr[0][COP0_Cause] &= ~(0x400 << irqline);
}

#endif /* __MIPS3COM_H__ */
