tlb.h

/*
 * Project 64 - A Nintendo 64 emulator.
 *
 * (c) Copyright 2001 zilmar (zilmar@emulation64.com) and
 * Jabo (jabo@emulation64.com).
 *
 * pj64 homepage: www.pj64.net
 *
 * Permission to use, copy, modify and distribute Project64 in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Project64 is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Project64 or software derived from Project64.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so if they want them.
 *
 */
#ifndef _TLB_H_
#define _TLB_H_

#define TLB_GRAN    12

typedef struct
{
    uint32_t EntryDefined;
    union
    {
        uint32_t Value;
        uint8_t A[4];

        struct
        {
            unsigned zero : 13;
            unsigned Mask : 12;
            unsigned zero2 : 7;
        } ;

    } PageMask;

    union
    {
        uint32_t Value;
        uint8_t A[4];

        struct
        {
            unsigned ASID : 8;
            unsigned Zero : 4;
            unsigned G : 1;
            unsigned VPN2 : 19;
        };

    } EntryHi;

    union
    {
        uint32_t Value;
        uint8_t A[4];

        struct
        {
            unsigned GLOBAL: 1;
            unsigned V : 1;
            unsigned D : 1;
            unsigned C : 3;
            unsigned PFN : 20;
            unsigned ZERO: 6;
        };

    } EntryLo0;

    union
    {
        uint32_t Value;
        uint8_t A[4];

        struct
        {
            unsigned GLOBAL: 1;
            unsigned V : 1;
            unsigned D : 1;
            unsigned C : 3;
            unsigned PFN : 20;
            unsigned ZERO: 6;
        } ;

    } EntryLo1;
} TLB;

typedef struct
{
    uint32_t VSTART;
    uint32_t VEND;
    uint32_t PHYSSTART;
    uint32_t VALID;
    uint32_t DIRTY;
    uint32_t GLOBAL;
    uint32_t ValidEntry;
} FASTTLB;

extern FASTTLB FastTlb[64];
extern TLB tlb[32];

uint32_t AddressDefined ( uintptr_t VAddr);
void InitilizeTLB   ( void );
void SetupTLB       ( void );
void TLB_Probe      ( void );
void TLB_Read       ( void );
uint32_t TranslateVaddr ( uintptr_t * Addr);
void WriteTLBEntry  ( int32_t index );

#endif