source/src/vm/jx/floppy.cpp

   1 /*
   2         IBM Japan Ltd PC/JX Emulator 'eJX'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2011.05.09-
   6
   7         [ diskette i/f ]
   8 */
   9
  10 #include "floppy.h"
  11 #include "../i8259.h"
  12 #include "../upd765a.h"
  13
  14 namespace JX {
  15
  16 void FLOPPY::reset()
  17 {
  18         prev = 0;
  19         register_id = -1;
  20 }
  21
  22 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  23 {
  24         switch(addr) {
  25         case 0xf2:
  26                 d_fdc->write_signal(SIG_UPD765A_MOTOR, data, 1);        // drive enable
  27                 if(data & 0x20) {
  28                         // WatchDog Timer is enabled
  29                         if((prev & 0x40) && !(data & 0x40)) {
  30                                 if(register_id != -1) {
  31                                         cancel_event(this, register_id);
  32                                 }
  33                                 register_event_by_clock(this, 0, 3 * CPU_CLOCKS, false, &register_id);
  34                         }
  35                 } else {
  36                         if(register_id != -1) {
  37                                 cancel_event(this, register_id);
  38                                 register_id = -1;
  39                         }
  40                 }
  41                 if((prev & 0x80) && !(data & 0x80)) {
  42                         d_fdc->reset();
  43                 }
  44                 prev = data;
  45                 break;
  46         }
  47 }
  48
  49 void FLOPPY::event_callback(int event_id, int err)
  50 {
  51         // WatchDog Timer
  52         this->out_debug_log(_T("WatchDog Timer\n"));
  53         d_pic->write_signal(SIG_I8259_IR6, 1, 1);
  54         register_id = -1;
  55 }
  56
  57 #define STATE_VERSION   1
  58
  59 bool FLOPPY::process_state(FILEIO* state_fio, bool loading)
  60 {
  61         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  62                 return false;
  63         }
  64         if(!state_fio->StateCheckInt32(this_device_id)) {
  65                 return false;
  66         }
  67         state_fio->StateUint8(prev);
  68         state_fio->StateInt32(register_id);
  69         return true;
  70 }
  71
  72 }