/[gxemul]/trunk/src/devices/dev_mc146818.c
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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Diff of /trunk/src/devices/dev_mc146818.c

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revision 41 by dpavlin, Mon Oct 8 16:21:17 2007 UTC revision 42 by dpavlin, Mon Oct 8 16:22:32 2007 UTC
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *     *  
27   *   *
28   *  $Id: dev_mc146818.c,v 1.95 2007/02/03 16:55:55 debug Exp $   *  $Id: dev_mc146818.c,v 1.99 2007/06/15 19:57:33 debug Exp $
29   *     *  
30   *  MC146818 real-time clock, used by many different machines types.   *  COMMENT: MC146818 real-time clock
31     *
32   *  (DS1687 as used in some other machines is also similar to the MC146818.)   *  (DS1687 as used in some other machines is also similar to the MC146818.)
33   *   *
34   *  This device contains Date/time, the machine's ethernet address (on   *  This device contains Date/time, the machine's ethernet address (on
# Line 58  Line 59 
59    
60  /*  #define MC146818_DEBUG  */  /*  #define MC146818_DEBUG  */
61    
62  #define TICK_SHIFT      14  #define MC146818_TICK_SHIFT     14
63    
64    
65  /*  256 on DECstation, SGI uses reg at 72*4 as the Century  */  /*  256 on DECstation, SGI uses reg at 72*4 as the Century  */
# Line 119  DEVICE_TICK(mc146818) Line 120  DEVICE_TICK(mc146818)
120          int pti = d->pending_timer_interrupts;          int pti = d->pending_timer_interrupts;
121    
122          if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && pti > 0) {          if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && pti > 0) {
                 static int warned = 0;  
                 if (pti > 1500 && !warned) {  
                         warned = 1;  
                         fatal("[ WARNING: MC146818 interrupts lost, "  
                             "host too slow? ]\n");  
                 }  
   
123  #if 0  #if 0
124                  /*  For debugging, to see how much the interrupts are                  /*  For debugging, to see how much the interrupts are
125                      lagging behind the real clock:  */                      lagging behind the real clock:  */
# Line 157  DEVICE_TICK(mc146818) Line 151  DEVICE_TICK(mc146818)
151   *  It seems like JAZZ machines accesses the mc146818 by writing one byte to   *  It seems like JAZZ machines accesses the mc146818 by writing one byte to
152   *  0x90000070 and then reading or writing another byte at 0x......0004000.   *  0x90000070 and then reading or writing another byte at 0x......0004000.
153   */   */
154  int dev_mc146818_jazz_access(struct cpu *cpu, struct memory *mem,  DEVICE_ACCESS(mc146818_jazz)
         uint64_t relative_addr, unsigned char *data, size_t len,  
         int writeflag, void *extra)  
155  {  {
156          struct mc_data *d = extra;          struct mc_data *d = extra;
157    
# Line 284  static void mc146818_update_time(struct Line 276  static void mc146818_update_time(struct
276  }  }
277    
278    
279  /*  DEVICE_ACCESS(mc146818)
  *  dev_mc146818_access():  
  *  
  *  TODO: This access function only handles 8-bit accesses!  
  */  
 int dev_mc146818_access(struct cpu *cpu, struct memory *mem,  
         uint64_t r, unsigned char *data, size_t len,  
         int writeflag, void *extra)  
280  {  {
281            struct mc_data *d = extra;
282          struct tm *tmp;          struct tm *tmp;
283          time_t timet;          time_t timet;
         struct mc_data *d = extra;  
         int relative_addr = r;  
284          size_t i;          size_t i;
285    
286            /*  NOTE/TODO: This access function only handles 8-bit accesses!  */
287    
288          relative_addr /= d->addrdiv;          relative_addr /= d->addrdiv;
289    
290          /*  Different ways of accessing the registers:  */          /*  Different ways of accessing the registers:  */
# Line 607  void dev_mc146818_init(struct machine *m Line 593  void dev_mc146818_init(struct machine *m
593          int i, dev_len;          int i, dev_len;
594          struct mc_data *d;          struct mc_data *d;
595    
596          d = malloc(sizeof(struct mc_data));          CHECK_ALLOCATION(d = malloc(sizeof(struct mc_data)));
         if (d == NULL) {  
                 fprintf(stderr, "out of memory\n");  
                 exit(1);  
         }  
   
597          memset(d, 0, sizeof(struct mc_data));          memset(d, 0, sizeof(struct mc_data));
598    
599          d->access_style  = access_style;          d->access_style  = access_style;
# Line 635  void dev_mc146818_init(struct machine *m Line 616  void dev_mc146818_init(struct machine *m
616          }          }
617    
618          if (access_style == MC146818_DEC) {          if (access_style == MC146818_DEC) {
619          /*  Station Ethernet Address, on DECstation 3100:  */                  /*  Station Ethernet Address, on DECstation 3100:  */
620          for (i=0; i<6; i++)                  for (i=0; i<6; i++)
621                  ether_address[i] = 0x10 * (i+1);                          ether_address[i] = 0x10 * (i+1);
622    
623                  d->reg[0x01] = ether_address[0];                  d->reg[0x01] = ether_address[0];
624                  d->reg[0x05] = ether_address[1];                  d->reg[0x05] = ether_address[1];
# Line 704  void dev_mc146818_init(struct machine *m Line 685  void dev_mc146818_init(struct machine *m
685          mc146818_update_time(d);          mc146818_update_time(d);
686    
687          machine_add_tickfunction(machine, dev_mc146818_tick, d,          machine_add_tickfunction(machine, dev_mc146818_tick, d,
688              TICK_SHIFT, 0.0);              MC146818_TICK_SHIFT);
689  }  }
690    
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