pico/memory.h

   1 // memory map related stuff
   2
   3 typedef unsigned char  u8;
   4 typedef unsigned short u16;
   5 typedef unsigned int   u32;
   6 typedef unsigned long  uptr; // unsigned pointer-sized int
   7
   8 #define M68K_MEM_SHIFT 16
   9 // minimum size we can map
  10 #define M68K_BANK_SIZE (1 << M68K_MEM_SHIFT)
  11 #define M68K_BANK_MASK (M68K_BANK_SIZE - 1)
  12
  13 extern uptr m68k_read8_map  [0x1000000 >> M68K_MEM_SHIFT];
  14 extern uptr m68k_read16_map [0x1000000 >> M68K_MEM_SHIFT];
  15 extern uptr m68k_write8_map [0x1000000 >> M68K_MEM_SHIFT];
  16 extern uptr m68k_write16_map[0x1000000 >> M68K_MEM_SHIFT];
  17
  18 extern uptr s68k_read8_map  [0x1000000 >> M68K_MEM_SHIFT];
  19 extern uptr s68k_read16_map [0x1000000 >> M68K_MEM_SHIFT];
  20 extern uptr s68k_write8_map [0x1000000 >> M68K_MEM_SHIFT];
  21 extern uptr s68k_write16_map[0x1000000 >> M68K_MEM_SHIFT];
  22
  23 // top-level handlers that cores can use
  24 // (or alternatively build them into themselves)
  25 // XXX: unhandled: *16 and *32 might cross the bank boundaries
  26 typedef u32  (cpu68k_read_f)(u32 a);
  27 typedef void (cpu68k_write_f)(u32 a, u32 d);
  28
  29 extern u32 m68k_read8(u32 a);
  30 extern u32 m68k_read16(u32 a);
  31 extern void m68k_write8(u32 a, u8 d);
  32 extern void m68k_write16(u32 a, u16 d);
  33
  34 // z80
  35 #define Z80_MEM_SHIFT 13
  36 extern uptr z80_read_map [0x10000 >> Z80_MEM_SHIFT];
  37 extern uptr z80_write_map[0x10000 >> Z80_MEM_SHIFT];
  38 typedef unsigned char (z80_read_f)(unsigned short a);
  39 typedef void (z80_write_f)(unsigned int a, unsigned char data);
  40
  41 void z80_map_set(uptr *map, int start_addr, int end_addr,
  42     const void *func_or_mh, int is_func);
  43 void cpu68k_map_set(uptr *map, int start_addr, int end_addr,
  44     const void *func_or_mh, int is_func);
  45 void cpu68k_map_all_ram(int start_addr, int end_addr, void *ptr, int is_sub);
  46 void m68k_map_unmap(int start_addr, int end_addr);
  47
  48 #define MAP_FLAG ((uptr)1 << (sizeof(uptr) * 8 - 1))
  49 #define map_flag_set(x) ((x) & MAP_FLAG)
  50
  51 #define MAKE_68K_READ8(name, map)               \
  52 u32 name(u32 a)                                 \
  53 {                                               \
  54   uptr v;                                       \
  55   a &= 0x00ffffff;                              \
  56   v = map[a >> M68K_MEM_SHIFT];                 \
  57   if (map_flag_set(v))                          \
  58     return ((cpu68k_read_f *)(v << 1))(a);      \
  59   else                                          \
  60     return *(u8 *)((v << 1) + (a ^ 1));         \
  61 }
  62
  63 #define MAKE_68K_READ16(name, map)              \
  64 u32 name(u32 a)                                 \
  65 {                                               \
  66   uptr v;                                       \
  67   a &= 0x00fffffe;                              \
  68   v = map[a >> M68K_MEM_SHIFT];                 \
  69   if (map_flag_set(v))                          \
  70     return ((cpu68k_read_f *)(v << 1))(a);      \
  71   else                                          \
  72     return *(u16 *)((v << 1) + a);              \
  73 }
  74
  75 #define MAKE_68K_READ32(name, map)              \
  76 u32 name(u32 a)                                 \
  77 {                                               \
  78   uptr v, vs;                                   \
  79   u32 d;                                        \
  80   a &= 0x00fffffe;                              \
  81   v = map[a >> M68K_MEM_SHIFT];                 \
  82   vs = v << 1;                                  \
  83   if (map_flag_set(v)) {                        \
  84     d  = ((cpu68k_read_f *)vs)(a) << 16;        \
  85     d |= ((cpu68k_read_f *)vs)(a + 2);          \
  86   }                                             \
  87   else {                                        \
  88     u16 *m = (u16 *)(vs + a);                   \
  89     d = (m[0] << 16) | m[1];                    \
  90   }                                             \
  91   return d;                                     \
  92 }
  93
  94 #define MAKE_68K_WRITE8(name, map)              \
  95 void name(u32 a, u8 d)                          \
  96 {                                               \
  97   uptr v;                                       \
  98   a &= 0x00ffffff;                              \
  99   v = map[a >> M68K_MEM_SHIFT];                 \
 100   if (map_flag_set(v))                          \
 101     ((cpu68k_write_f *)(v << 1))(a, d);         \
 102   else                                          \
 103     *(u8 *)((v << 1) + (a ^ 1)) = d;            \
 104 }
 105
 106 #define MAKE_68K_WRITE16(name, map)             \
 107 void name(u32 a, u16 d)                         \
 108 {                                               \
 109   uptr v;                                       \
 110   a &= 0x00fffffe;                              \
 111   v = map[a >> M68K_MEM_SHIFT];                 \
 112   if (map_flag_set(v))                          \
 113     ((cpu68k_write_f *)(v << 1))(a, d);         \
 114   else                                          \
 115     *(u16 *)((v << 1) + a) = d;                 \
 116 }
 117
 118 #define MAKE_68K_WRITE32(name, map)             \
 119 void name(u32 a, u32 d)                         \
 120 {                                               \
 121   uptr v, vs;                                   \
 122   a &= 0x00fffffe;                              \
 123   v = map[a >> M68K_MEM_SHIFT];                 \
 124   vs = v << 1;                                  \
 125   if (map_flag_set(v)) {                        \
 126     ((cpu68k_write_f *)vs)(a, d >> 16);         \
 127     ((cpu68k_write_f *)vs)(a + 2, d);           \
 128   }                                             \
 129   else {                                        \
 130     u16 *m = (u16 *)(vs + a);                   \
 131     m[0] = d >> 16;                             \
 132     m[1] = d;                                   \
 133   }                                             \
 134 }
 135
 136 #ifdef NEED_DMA_SOURCE // meh
 137
 138 static __inline void *m68k_dma_source(u32 a)
 139 {
 140   u8 *base;
 141   uptr v;
 142   v = m68k_read16_map[a >> M68K_MEM_SHIFT];
 143   if (map_flag_set(v)) {
 144     if (a >= Pico.romsize) // Rom
 145       return NULL;
 146     base = Pico.rom;
 147   }
 148   else
 149     base = (void *)(v << 1);
 150   return base + (a & 0xfe0000);
 151 }
 152
 153 #endif
 154
 155 // 32x
 156 typedef struct {
 157   uptr addr; // stores (membase >> 1) or ((handler >> 1) | (1<<31))
 158   u32 mask;
 159 } sh2_memmap;