source/src/vm/phc25/memory.cpp

   1 /*
   2         SANYO PHC-25 Emulator 'ePHC-25'
   3         SEIKO MAP-1010 Emulator 'eMAP-1010'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2010.08.03-
   7
   8         [ memory ]
   9 */
  10
  11 #include "./memory.h"
  12
  13 namespace PHC25 {
  14
  15 #define SET_BANK(s, e, w, r) { \
  16         int sb = (s) >> 11, eb = (e) >> 11; \
  17         for(int i = sb; i <= eb; i++) { \
  18                 if((w) == wdmy) { \
  19                         wbank[i] = wdmy; \
  20                 } else { \
  21                         wbank[i] = (w) + 0x800 * (i - sb); \
  22                 } \
  23                 if((r) == rdmy) { \
  24                         rbank[i] = rdmy; \
  25                 } else { \
  26                         rbank[i] = (r) + 0x800 * (i - sb); \
  27                 } \
  28         } \
  29 }
  30
  31 void MEMORY::initialize()
  32 {
  33         memset(rom, 0xff, sizeof(rom));
  34         memset(rdmy, 0xff, sizeof(rdmy));
  35
  36         // load rom image
  37         FILEIO* fio = new FILEIO();
  38         if(fio->Fopen(create_local_path(_T("BASIC.ROM")), FILEIO_READ_BINARY)) {
  39                 fio->Fread(rom, sizeof(rom), 1);
  40                 fio->Fclose();
  41         }
  42         delete fio;
  43
  44         // set memory map
  45 #ifdef _MAP1010
  46         SET_BANK(0x0000, 0x5fff, wdmy, rom );
  47         SET_BANK(0x6000, 0x77ff, vram, vram);
  48         SET_BANK(0x7800, 0x7fff, wdmy, rdmy);
  49         SET_BANK(0x8000, 0xffff, ram,  ram );
  50 #else
  51         SET_BANK(0x0000, 0x5fff, wdmy, rom );
  52         SET_BANK(0x6000, 0x77ff, vram, vram);
  53         SET_BANK(0x7800, 0xbfff, wdmy, rdmy);
  54         SET_BANK(0xc000, 0xffff, ram,  ram );
  55 #endif
  56 }
  57
  58 void MEMORY::reset()
  59 {
  60         memset(ram, 0, sizeof(ram));
  61         memset(vram, 0, sizeof(vram));
  62 }
  63
  64 void MEMORY::write_data8(uint32_t addr, uint32_t data)
  65 {
  66         addr &= 0xffff;
  67 #ifdef _MAP1010
  68         if(0x7800 <= addr && addr < 0x8000) {
  69                 // memory mapped i/o
  70                 return;
  71         }
  72 #endif
  73         wbank[addr >> 11][addr & 0x7ff] = data;
  74 }
  75
  76 uint32_t MEMORY::read_data8(uint32_t addr)
  77 {
  78         addr &= 0xffff;
  79 #ifdef _MAP1010
  80         if(0x7800 <= addr && addr < 0x7860) {
  81                 return d_kbd->read_io8(addr);
  82         } else if(0x7860 <= addr && addr < 0x8000) {
  83                 // memory mapped i/o
  84                 return 0xff;
  85         }
  86 #endif
  87         return rbank[addr >> 11][addr & 0x7ff];
  88 }
  89
  90 #define STATE_VERSION   1
  91
  92 bool MEMORY::process_state(FILEIO* state_fio, bool loading)
  93 {
  94         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  95                 return false;
  96         }
  97         if(!state_fio->StateCheckInt32(this_device_id)) {
  98                 return false;
  99         }
 100         state_fio->StateBuffer(ram, sizeof(ram), 1);
 101         state_fio->StateBuffer(vram, sizeof(vram), 1);
 102         return true;
 103 }
 104
 105 }