/[VRac]/M6502/M6502.xs
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 108 by dpavlin, Fri Aug 3 09:18:08 2007 UTC revision 195 by dpavlin, Sun Apr 13 00:32:39 2008 UTC
# Line 10  Line 10 
10  M6502 *R = NULL;  M6502 *R = NULL;
11  int debug = 0;  int debug = 0;
12    
13    // same as memory size
14    #define CACHE_SIZE 0xffff
15  byte opCache[CACHE_SIZE];  byte opCache[CACHE_SIZE];
16    
17    #define CALLBACK_READ_SKIP      0x00
18    #define CALLBACK_READ_ONCE      0x01
19    #define CALLBACK_READ_ALWAYS    0x02
20    #define CALLBACK_READ_MASK      0x0f
21    #define CALLBACK_WRITE_SKIP     0x00
22    #define CALLBACK_WRITE_ONCE     0x10
23    #define CALLBACK_WRITE_ALWAYS   0x20
24    #define CALLBACK_WRITE_MASK     0xf0
25    byte perlCallBack[CACHE_SIZE];
26    
27  void update_C_R(void) {  void update_C_R(void) {
28          R->A = SvIV( get_sv("M6502::A", FALSE) );          R->A = SvIV( get_sv("M6502::A", FALSE) );
29          R->P = SvIV( get_sv("M6502::P", FALSE) );          R->P = SvIV( get_sv("M6502::P", FALSE) );
# Line 71  byte Debug6502(M6502 *R) { Line 83  byte Debug6502(M6502 *R) {
83  /** required if there is a #define FAST_RDOP.               **/  /** required if there is a #define FAST_RDOP.               **/
84  /************************************ TO BE WRITTEN BY USER **/  /************************************ TO BE WRITTEN BY USER **/
85    
86  byte mem(word Addr) {  byte mem(register word Addr) {
87    
88            if ( perlCallBack[Addr] & CALLBACK_READ_MASK == CALLBACK_READ_SKIP )
89                    return opCache[Addr];
90            if ( perlCallBack[Addr] & CALLBACK_READ_MASK == CALLBACK_READ_ONCE )
91                    perlCallBack[Addr] = perlCallBack[Addr] & CALLBACK_WRITE_MASK | CALLBACK_READ_SKIP;
92    
93          byte byte;          byte byte;
94          int count;          int count;
95          debugf(("mem(%04x)", Addr));          debugf(("mem(%04x)", Addr));
# Line 112  byte Rd6502(register word Addr) { Line 130  byte Rd6502(register word Addr) {
130  void Wr6502(register word Addr,register byte Value) {  void Wr6502(register word Addr,register byte Value) {
131          debugf(("Wr6502(%04x,%02x)", Addr, Value));          debugf(("Wr6502(%04x,%02x)", Addr, Value));
132          opCache[Addr] = Value;          opCache[Addr] = Value;
133            if ( perlCallBack[Addr] & CALLBACK_WRITE_MASK == CALLBACK_WRITE_SKIP ) return;
134            if ( perlCallBack[Addr] & CALLBACK_WRITE_MASK == CALLBACK_WRITE_ONCE )
135                    perlCallBack[Addr] = perlCallBack[Addr] & CALLBACK_READ_MASK | CALLBACK_WRITE_SKIP;
136          dSP;          dSP;
137          ENTER;          ENTER;
138          SAVETMPS;          SAVETMPS;
# Line 126  void Wr6502(register word Addr,register Line 147  void Wr6502(register word Addr,register
147    
148  byte Op6502(register word Addr) {  byte Op6502(register word Addr) {
149          byte Op;          byte Op;
         if ( opCache[Addr] ) return opCache[Addr];  
150          Op = mem(Addr);          Op = mem(Addr);
151          debugf(("Op6502(%04x,%02x) PC:%04x", Addr, Op, R->PC.W));          debugf(("Op6502(%04x,%02x) PC:%04x", Addr, Op, R->PC.W));
152          return Op;          return Op;
# Line 174  reset (void) { Line 194  reset (void) {
194                          PerlIO_stdoutf("can't alloc %d bytes for M6502", sizeof(M6502));                          PerlIO_stdoutf("can't alloc %d bytes for M6502", sizeof(M6502));
195                          exit(1);                          exit(1);
196                  }                  }
197                  memset( opCache, 0, sizeof(opCache) );                  memset( opCache, 0, CACHE_SIZE );
198                    memset( perlCallBack, CALLBACK_READ_ALWAYS | CALLBACK_WRITE_ALWAYS, CACHE_SIZE );
199          }          }
200          Reset6502(R);          Reset6502(R);
201          debugf(("Reset6502 over"));          debugf(("Reset6502 over"));
# Line 205  int get_debug(void) { Line 226  int get_debug(void) {
226          return debug;          return debug;
227  }  }
228    
229    /* FIXME somehow check if Addr will fit in int on current platform */
230    void set_read_callback(int Addr) {
231            perlCallBack[Addr] == perlCallBack[Addr] & CALLBACK_WRITE_MASK | CALLBACK_READ_ALWAYS;
232    }
233    
234    void set_write_callback(int Addr) {
235            perlCallBack[Addr] == perlCallBack[Addr] & CALLBACK_READ_MASK | CALLBACK_WRITE_ALWAYS;
236    }
237    
238    /* we fake here, since we will need to call perl at least once to get initial value... */
239    int disable_all_callbacks(void) {
240            memset( perlCallBack, CALLBACK_READ_ONCE | CALLBACK_WRITE_ONCE, CACHE_SIZE );
241            return perlCallBack[0];
242    }
243    
244    
245  MODULE = M6502          PACKAGE = M6502  MODULE = M6502          PACKAGE = M6502
246    
247  PROTOTYPES: DISABLE  PROTOTYPES: DISABLE
# Line 226  update_perl_R() Line 263  update_perl_R()
263    
264  int  int
265  exec(int cycles)  exec(int cycles)
266    
267    void
268    set_read_callback(int Addr)
269    
270    void
271    set_write_callback(int Addr)
272    
273    int
274    disable_all_callbacks()
275    
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