/[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 15 by dpavlin, Mon Oct 8 16:18:38 2007 UTC revision 16 by dpavlin, Mon Oct 8 16:19:01 2007 UTC
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *     *  
27   *   *
28   *  $Id: dev_mc146818.c,v 1.72 2005/08/02 07:56:37 debug Exp $   *  $Id: dev_mc146818.c,v 1.75 2005/10/09 22:21:31 debug Exp $
29   *     *  
30   *  MC146818 real-time clock, used by many different machines types.   *  MC146818 real-time clock, used by many different machines types.
31   *  (DS1687 as used in some SGI machines is similar to MC146818.)   *  (DS1687 as used in some other machines is also similar to the MC146818.)
32   *   *
33   *  This device contains Date/time, the machine's ethernet address (on   *  This device contains Date/time, the machine's ethernet address (on
34   *  DECstation 3100), and can cause periodic (hardware) interrupts.   *  DECstation 3100), and can cause periodic (hardware) interrupts.
# Line 222  static void mc146818_update_time(struct Line 222  static void mc146818_update_time(struct
222          d->reg[4 * MC_MONTH] = tmp->tm_mon + 1;          d->reg[4 * MC_MONTH] = tmp->tm_mon + 1;
223          d->reg[4 * MC_YEAR]  = tmp->tm_year;          d->reg[4 * MC_YEAR]  = tmp->tm_year;
224    
225            /*
226             *  Special hacks for emulating the behaviour of various machines:
227             */
228          switch (d->access_style) {          switch (d->access_style) {
229          case MC146818_ARC_NEC:          case MC146818_ARC_NEC:
230                  d->reg[4 * MC_YEAR] += (0x18 - 104);                  d->reg[4 * MC_YEAR] += (0x18 - 104);
231                  break;                  break;
232            case MC146818_CATS:
233                    d->reg[4 * MC_YEAR] %= 100;
234                    break;
235          case MC146818_SGI:          case MC146818_SGI:
236                  /*                  /*
237                   *  NetBSD/sgimips assumes data in BCD format.                   *  NetBSD/sgimips assumes data in BCD format.
# Line 247  static void mc146818_update_time(struct Line 253  static void mc146818_update_time(struct
253                            (d->reg[4 * MC_YEAR] - 30 + 40)                            (d->reg[4 * MC_YEAR] - 30 + 40)
254                          : (d->reg[4 * MC_YEAR] - 40)                          : (d->reg[4 * MC_YEAR] - 40)
255                        );                        );
   
256                  /*  Century:  */                  /*  Century:  */
257                  d->reg[72 * 4] = 19 + (tmp->tm_year / 100);                  d->reg[72 * 4] = 19 + (tmp->tm_year / 100);
   
258                  break;                  break;
259          case MC146818_DEC:          case MC146818_DEC:
260                  /*                  /*
# Line 303  int dev_mc146818_access(struct cpu *cpu, Line 307  int dev_mc146818_access(struct cpu *cpu,
307    
308          /*  Different ways of accessing the registers:  */          /*  Different ways of accessing the registers:  */
309          switch (d->access_style) {          switch (d->access_style) {
310            case MC146818_CATS:
311          case MC146818_PC_CMOS:          case MC146818_PC_CMOS:
312                  if (relative_addr == 0x70 || relative_addr == 0x00) {                  if ((relative_addr & 1) == 0x00) {
313                          if (writeflag == MEM_WRITE) {                          if (writeflag == MEM_WRITE) {
314                                  d->last_addr = data[0];                                  d->last_addr = data[0];
315                                  return 1;                                  return 1;
# Line 312  int dev_mc146818_access(struct cpu *cpu, Line 317  int dev_mc146818_access(struct cpu *cpu,
317                                  data[0] = d->last_addr;                                  data[0] = d->last_addr;
318                                  return 1;                                  return 1;
319                          }                          }
320                  } else if (relative_addr == 0x71 || relative_addr == 0x01)                  } else
321                          relative_addr = d->last_addr * 4;                          relative_addr = d->last_addr * 4;
                 else {  
                         fatal("[ mc146818: not accessed as an "  
                             "MC146818_PC_CMOS device! ]\n");  
                 }  
322                  break;                  break;
323          case MC146818_ARC_NEC:          case MC146818_ARC_NEC:
324                  if (relative_addr == 0x01) {                  if (relative_addr == 0x01) {
# Line 630  void dev_mc146818_init(struct machine *m Line 631  void dev_mc146818_init(struct machine *m
631    
632          dev_len = DEV_MC146818_LENGTH;          dev_len = DEV_MC146818_LENGTH;
633          switch (access_style) {          switch (access_style) {
634            case MC146818_CATS:
635          case MC146818_PC_CMOS:          case MC146818_PC_CMOS:
636                  dev_len = 2;                  dev_len = 2;
637                  break;                  break;
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