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Annotation of hatari/src/cycles.c, revision 1.1

1.1     ! root        1: /*
        !             2:   Hatari - cycles.c
        !             3: 
        !             4:   This file is distributed under the GNU Public License, version 2 or at
        !             5:   your option any later version. Read the file gpl.txt for details.
        !             6: 
        !             7:   Here we take care of cycle counters. For performance reasons we don't increase
        !             8:   all counters after each 68k instruction, but only one main counter.
        !             9:   When we need to read one of the normal counters (currently only for video
        !            10:   and sound cycles), we simply update these counters with the main counter
        !            11:   before returning the current counter value.
        !            12: */
        !            13: const char Cycles_rcsid[] = "Hatari $Id: cycles.c,v 1.3 2006/02/08 22:49:27 eerot Exp $";
        !            14: 
        !            15: #include "main.h"
        !            16: #include "cycles.h"
        !            17: 
        !            18: 
        !            19: int nCyclesMainCounter;                         /* Main cycles counter */
        !            20: 
        !            21: static int nCyclesCounter[CYCLES_COUNTER_MAX];  /* Array with all counters */
        !            22: 
        !            23: 
        !            24: /*-----------------------------------------------------------------------*/
        !            25: /*
        !            26:   Update all cycles counters with the current value of nCyclesMainCounter.
        !            27: */
        !            28: static void Cycles_UpdateCounters(void)
        !            29: {
        !            30:        int i;
        !            31: 
        !            32:        for (i = 0; i < CYCLES_COUNTER_MAX; i++)
        !            33:        {
        !            34:                nCyclesCounter[i] += nCyclesMainCounter;
        !            35:        }
        !            36: 
        !            37:        nCyclesMainCounter = 0;
        !            38: }
        !            39: 
        !            40: 
        !            41: /*-----------------------------------------------------------------------*/
        !            42: /*
        !            43:   Set a counter to a new value.
        !            44: */
        !            45: void Cycles_SetCounter(int nId, int nValue)
        !            46: {
        !            47:        /* Update counters first (nCyclesMainCounter must be 0 afterwards) */
        !            48:        Cycles_UpdateCounters();
        !            49: 
        !            50:        /* Now set the new value: */
        !            51:        nCyclesCounter[nId] = nValue;
        !            52: }
        !            53: 
        !            54: 
        !            55: /*-----------------------------------------------------------------------*/
        !            56: /*
        !            57:   Read a counter.
        !            58: */
        !            59: int Cycles_GetCounter(int nId)
        !            60: {
        !            61:        /* Update counters first so we read an up-to-date value */
        !            62:        Cycles_UpdateCounters();
        !            63: 
        !            64:        return nCyclesCounter[nId];
        !            65: }
        !            66: 
        !            67: 
        !            68: /*-----------------------------------------------------------------------*/
        !            69: /*
        !            70:   Read a counter on CPU memory read access by taking care of the instruction
        !            71:   type (add the needed amount of additional cycles).
        !            72: */
        !            73: int Cycles_GetCounterOnReadAccess(int nId)
        !            74: {
        !            75:        int nAddCycles;
        !            76: 
        !            77:        /* Update counters first so we read an up-to-date value */
        !            78:        Cycles_UpdateCounters();
        !            79: 
        !            80:        /* TODO: Find proper cycle offset depending on the type of the current instruction */
        !            81:        nAddCycles = 0;
        !            82: 
        !            83:        return nCyclesCounter[nId] + nAddCycles;
        !            84: }
        !            85: 
        !            86: 
        !            87: /*-----------------------------------------------------------------------*/
        !            88: /*
        !            89:   Read a counter on CPU memory write access by taking care of the instruction
        !            90:   type (add the needed amount of additional cycles).
        !            91: */
        !            92: int Cycles_GetCounterOnWriteAccess(int nId)
        !            93: {
        !            94:        int nAddCycles;
        !            95: 
        !            96:        /* Update counters first so we read an up-to-date value */
        !            97:        Cycles_UpdateCounters();
        !            98: 
        !            99:        /* TODO: Find proper cycle offset depending on the type of the current instruction */
        !           100:        nAddCycles = 0;
        !           101: 
        !           102:        return nCyclesCounter[nId] + nAddCycles;
        !           103: }

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