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