source/src/vm/i8237.h

   1 /*
   2         Skelton for retropc emulator
   3
   4         Origin : MESS
   5         Author : Takeda.Toshiya
   6         Date   : 2006.12.06 -
   7
   8         [ i8237 ]
   9 */
  10
  11 #ifndef _I8237_H_
  12 #define _I8237_H_
  13
  14 #include "vm.h"
  15 #include "../emu.h"
  16 #include "device.h"
  17
  18 #define SIG_I8237_CH0   0
  19 #define SIG_I8237_CH1   1
  20 #define SIG_I8237_CH2   2
  21 #define SIG_I8237_CH3   3
  22 #define SIG_I8237_BANK0 4
  23 #define SIG_I8237_BANK1 5
  24 #define SIG_I8237_BANK2 6
  25 #define SIG_I8237_BANK3 7
  26 #define SIG_I8237_MASK0 8
  27 #define SIG_I8237_MASK1 9
  28 #define SIG_I8237_MASK2 10
  29 #define SIG_I8237_MASK3 11
  30
  31 class I8237 : public DEVICE
  32 {
  33 private:
  34         DEVICE* d_mem;
  35 #ifdef SINGLE_MODE_DMA
  36         DEVICE* d_dma;
  37 #endif
  38
  39         struct {
  40                 DEVICE* dev;
  41                 uint16 areg;
  42                 uint16 creg;
  43                 uint16 bareg;
  44                 uint16 bcreg;
  45                 uint8 mode;
  46                 // external bank
  47                 uint16 bankreg;
  48                 uint16 incmask;
  49         } dma[4];
  50
  51         bool low_high;
  52         uint8 cmd;
  53         uint8 req;
  54         uint8 mask;
  55         uint8 tc;
  56         uint32 tmp;
  57         bool mode_word;
  58
  59         void write_mem(uint32 addr, uint32 data);
  60         uint32 read_mem(uint32 addr);
  61         void write_io(int ch, uint32 data);
  62         uint32 read_io(int ch);
  63
  64 public:
  65         I8237(VM* parent_vm, EMU* parent_emu) : DEVICE(parent_vm, parent_emu)
  66         {
  67                 for(int i = 0; i < 4; i++) {
  68                         dma[i].dev = vm->dummy;
  69                         dma[i].bankreg = dma[i].incmask = 0;
  70                 }
  71 #ifdef SINGLE_MODE_DMA
  72                 d_dma = NULL;
  73 #endif
  74                 mode_word = false;
  75         }
  76         ~I8237() {}
  77
  78         // common functions
  79         void reset();
  80         void write_io8(uint32 addr, uint32 data);
  81         uint32 read_io8(uint32 addr);
  82         void write_signal(int id, uint32 data, uint32 mask);
  83         void do_dma();
  84         void save_state(FILEIO* state_fio);
  85         bool load_state(FILEIO* state_fio);
  86
  87         // unique functions
  88         void set_context_memory(DEVICE* device)
  89         {
  90                 d_mem = device;
  91         }
  92         void set_context_ch0(DEVICE* device)
  93         {
  94                 dma[0].dev = device;
  95         }
  96         void set_context_ch1(DEVICE* device)
  97         {
  98                 dma[1].dev = device;
  99         }
 100         void set_context_ch2(DEVICE* device)
 101         {
 102                 dma[2].dev = device;
 103         }
 104         void set_context_ch3(DEVICE* device)
 105         {
 106                 dma[3].dev = device;
 107         }
 108 #ifdef SINGLE_MODE_DMA
 109         void set_context_child_dma(DEVICE* device)
 110         {
 111                 d_dma = device;
 112         }
 113 #endif
 114         void set_mode_word(bool val)
 115         {
 116                 mode_word = val;
 117         }
 118 };
 119
 120 #endif
 121