cache.h

一个用在mips体系结构中的操作系统

/*
 * Copyright (C) 1996-1998 by the Board of Trustees
 *    of Leland Stanford Junior University.
 * 
 * This file is part of the SimOS distribution. 
 * See LICENSE file for terms of the license. 
 *
 */

#ifndef CACHE_H
#define CACHE_H

#ifndef _LANGUAGE_ASSEMBLY
/* Our miss handling table is very simple, it only allows 1 */
/* outstanding reference.  It could be extended to model a write */
/* buffer, but outstanding loads seems undoable because of the */
/* difficulty of register interlocks  */


typedef struct {
   EventCallbackHdr evthdr;   /* So we can make this an event callback */
   PA   pAddr;
   VA   vAddr;
   PA   pcPAddr;
   int  state;
   int  smht_flags;
   int64 iCount;
#if ROYG
   VA vpc;
   SimTime startTime;
   SimTime endTime;
#endif
}EmSMHT;


extern EmSMHT* emSMHT;
#define SMHT_NOTACTIVE  0x0
#define SMHT_ACTIVE     0x1
#define SMHT_UPGRADE    0x2
#define SMHT_PCCONFLICT 0x4
#define SMHT_SC         0x8
#define SMHT_DOUBLECOUNT   0x10
#define SMHT_INSTRUCTION 0x20
/* Just for efficiently */
#define SMHT_BD         0x40
#define SMHT_NLISL      0x80

#define CACHE_TAG_SIZE (LINES_PER_CACHE * sizeof(PLN))


extern void Cache_Init( int cpuNum );
extern void Cache_Clobber( int machine, int cpuNum, PA pAddr, Dir_Entry cpu_bits, 
                           EmVQCMemState state );
extern void UPCache_Ref( int cpuNum, PA pAddr, VA vAddr, EmVQCMemState state);
extern void MPCache_Ref( int cpuNum, PA pAddr, VA vAddr, EmVQCMemState state);
extern void MPinUPCache_Ref( int cpuNum, PA pAddr, VA vAddr, 
                             EmVQCMemState state );
/* Debugging functions */
extern int cache_verify_excl( int cpuNum, PLN pline );
extern int cache_verify_shared( int cpuNum, PLN pline );

/* Even at 16 byte lines, this limits us to 16GB */
/* Top Bit is valid/invalid.  Second top bit is shared/excl */
#define INVALID_TAG 0x80000000
/* Our cache tags carry extra info like if line is excl or shared */
#define CACHE_PLINE(_cline)      ((uint)(_cline) & 0xbFFFFFFF)
#define CACHE_EXCL(_cline)       ((uint)(_cline) & 0x40000000)
#define CACHE_SET_EXCL(_cline)   ((uint)(_cline) | 0x40000000)
#define CACHE_SHARED(_cline)     (!CACHE_EXCL(_cline))
#define CACHE_SET_SHARED(_cline) ((uint)(_cline) & 0xbFFFFFFF)
#define CACHE_INVALID(_cline)    ((uint)(_cline) & INVALID_TAG)
#define CACHE_VALID(_cline)      (!((uint)(_cline) & INVALID_TAG))
#endif
#endif