source/src/vm/pc9801/cpureg.cpp

   1 /*
   2         NEC PC-9801VX Emulator 'ePC-9801VX'
   3         NEC PC-9801RA Emulator 'ePC-9801RA'
   4         NEC PC-98XA Emulator 'ePC-98XA'
   5         NEC PC-98XL Emulator 'ePC-98XL'
   6         NEC PC-98RL Emulator 'ePC-98RL'
   7
   8         Author : Takeda.Toshiya
   9         Date   : 2017.06.25-
  10
  11         [ cpu regs ]
  12 */
  13
  14 #include "cpureg.h"
  15 #if defined(SUPPORT_32BIT_ADDRESS)
  16 #include "../i386.h"
  17 #else
  18 #include "../i286.h"
  19 #endif
  20
  21 namespace PC9801 {
  22
  23 void CPUREG::reset()
  24 {
  25         d_cpu->set_address_mask(0x000fffff);
  26         nmi_enabled = false;
  27 }
  28
  29 void CPUREG::write_io8(uint32_t addr, uint32_t data)
  30 {
  31         switch(addr) {
  32         case 0x0050:
  33                 nmi_enabled = false;
  34                 break;
  35         case 0x0052:
  36                 nmi_enabled = true;
  37                 break;
  38         case 0x00f0:
  39                 d_cpu->reset();
  40                 d_cpu->set_address_mask(0x000fffff);
  41                 break;
  42         case 0x00f2:
  43 //#if defined(SUPPORT_32BIT_ADDRESS)
  44 //              d_cpu->set_address_mask(0xffffffff);
  45 //#else
  46                 d_cpu->set_address_mask(0x00ffffff);
  47 //#endif
  48                 break;
  49 #if defined(SUPPORT_32BIT_ADDRESS)
  50         case 0x00f6:
  51                 switch(data) {
  52                 case 0x02:
  53 //                      d_cpu->set_address_mask(0xffffffff);
  54                         d_cpu->set_address_mask(0x00ffffff);
  55                         break;
  56                 case 0x03:
  57                         d_cpu->set_address_mask(0x000fffff);
  58                         break;
  59                 }
  60                 break;
  61 #endif
  62         }
  63 }
  64
  65 uint32_t CPUREG::read_io8(uint32_t addr)
  66 {
  67         uint32_t value;
  68
  69         switch(addr) {
  70         case 0x00f0:
  71                 value  = 0x00;
  72 //              value |= 0x80; // 1 = PC-9801NA, 0 = PC-9801NA/C
  73 //              value |= 0x80; // 1 = PC-9821modelS1, 0 = PC-9821modelS2
  74 //              value |= 0x80; // 1 = PC-9821CemodelS1, 0 = PC-9821CemodelS2
  75 //              value |= 0x80; // 1 = PC-9821Xt, 0 = PC-9821Xa
  76 //              value |= 0x80; // CPU MODE, 1 = High/Low, 0 = Middle (PC-9821Ap/As/Ae/Af)
  77 //              value |= 0x40; // ODP, 1 = Existing (PC-9821Ts)
  78 #if defined(SUPPORT_SCSI_IF)
  79 //              value |= 0x40; // Internal 55-type SCSI-HDD, 0 = Existing
  80 #endif
  81 #if defined(SUPPORT_SASI_IF)
  82 //              value |= 0x20; // Internal 27-type SASI-HDD, 0 = Existing
  83 #endif
  84 //              value |= 0x10; // Unknown
  85                 value |= 0x08; // RAM access, 1 = Internal-standard/External-enhanced RAM, 0 = Internal-enhanced RAM
  86 //              value |= 0x04; // Refresh mode, 1 = Standard, 0 = High speed
  87 #if defined(HAS_I86) || defined(HAS_V30)
  88                 value |= 0x02; // CPU mode, 1 = V30, 0 = 80286/80386
  89 #endif
  90                 value |= 0x01; // RAM access, 1 = Internal RAM, 0 = External-enhanced RAM
  91                 return value;
  92         case 0x00f2:
  93                 return ((d_cpu->get_address_mask() & (1 << 20)) ? 0x00 : 0x01) | 0xfe;
  94 #if defined(SUPPORT_32BIT_ADDRESS)
  95         case 0x00f6:
  96                 value  = 0x00;
  97 #if defined(SUPPORT_HIRESO) && !defined(_PC98RL)
  98                 value |= 0x10; // SASI-HDD, 1 = DMA ch0, 0 = DMA ch1
  99 #endif
 100                 if(nmi_enabled) {
 101                         value |= 0x02; // NMI, 1 = Enabled
 102                 }
 103                 return ((d_cpu->get_address_mask() & (1 << 20)) ? 0x00 : 0x01) | value;
 104 #endif
 105         }
 106         return 0xff;
 107 }
 108
 109 #define STATE_VERSION   1
 110
 111 bool CPUREG::process_state(FILEIO* state_fio, bool loading)
 112 {
 113         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 114                 return false;
 115         }
 116         if(!state_fio->StateCheckInt32(this_device_id)) {
 117                 return false;
 118         }
 119         state_fio->StateBool(nmi_enabled);
 120         return true;
 121 }
 122
 123 }
 124