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 // z80
  30 #define Z80_MEM_SHIFT 13
  31 extern uptr z80_read_map [0x10000 >> Z80_MEM_SHIFT];
  32 extern uptr z80_write_map[0x10000 >> Z80_MEM_SHIFT];
  33 typedef unsigned char (z80_read_f)(unsigned short a);
  34 typedef void (z80_write_f)(unsigned int a, unsigned char data);
  35
  36 void z80_map_set(uptr *map, int start_addr, int end_addr,
  37     const void *func_or_mh, int is_func);
  38 void cpu68k_map_set(uptr *map, int start_addr, int end_addr,
  39     const void *func_or_mh, int is_func);
  40 void cpu68k_map_all_ram(int start_addr, int end_addr, void *ptr, int is_sub);
  41 void m68k_map_unmap(int start_addr, int end_addr);
  42
  43 #define map_flag_set(x) ((x) & ((uptr)1 << (sizeof(uptr) * 8 - 1)))
  44
  45 #define MAKE_68K_READ8(name, map)               \
  46 u32 name(u32 a)                                 \
  47 {                                               \
  48   uptr v;                                       \
  49   a &= 0x00ffffff;                              \
  50   v = map[a >> M68K_MEM_SHIFT];                 \
  51   if (map_flag_set(v))                          \
  52     return ((cpu68k_read_f *)(v << 1))(a);      \
  53   else                                          \
  54     return *(u8 *)((v << 1) + (a ^ 1));         \
  55 }
  56
  57 #define MAKE_68K_READ16(name, map)              \
  58 u32 name(u32 a)                                 \
  59 {                                               \
  60   uptr v;                                       \
  61   a &= 0x00fffffe;                              \
  62   v = map[a >> M68K_MEM_SHIFT];                 \
  63   if (map_flag_set(v))                          \
  64     return ((cpu68k_read_f *)(v << 1))(a);      \
  65   else                                          \
  66     return *(u16 *)((v << 1) + a);              \
  67 }
  68
  69 #define MAKE_68K_READ32(name, map)              \
  70 u32 name(u32 a)                                 \
  71 {                                               \
  72   uptr v, vs;                                   \
  73   u32 d;                                        \
  74   a &= 0x00fffffe;                              \
  75   v = map[a >> M68K_MEM_SHIFT];                 \
  76   vs = v << 1;                                  \
  77   if (map_flag_set(v)) {                        \
  78     d  = ((cpu68k_read_f *)vs)(a) << 16;        \
  79     d |= ((cpu68k_read_f *)vs)(a + 2);          \
  80   }                                             \
  81   else {                                        \
  82     u16 *m = (u16 *)(vs + a);                   \
  83     d = (m[0] << 16) | m[1];                    \
  84   }                                             \
  85   return d;                                     \
  86 }
  87
  88 #define MAKE_68K_WRITE8(name, map)              \
  89 void name(u32 a, u8 d)                          \
  90 {                                               \
  91   uptr v;                                       \
  92   a &= 0x00ffffff;                              \
  93   v = map[a >> M68K_MEM_SHIFT];                 \
  94   if (map_flag_set(v))                          \
  95     ((cpu68k_write_f *)(v << 1))(a, d);         \
  96   else                                          \
  97     *(u8 *)((v << 1) + (a ^ 1)) = d;            \
  98 }
  99
 100 #define MAKE_68K_WRITE16(name, map)             \
 101 void name(u32 a, u16 d)                         \
 102 {                                               \
 103   uptr v;                                       \
 104   a &= 0x00fffffe;                              \
 105   v = map[a >> M68K_MEM_SHIFT];                 \
 106   if (map_flag_set(v))                          \
 107     ((cpu68k_write_f *)(v << 1))(a, d);         \
 108   else                                          \
 109     *(u16 *)((v << 1) + a) = d;                 \
 110 }
 111
 112 #define MAKE_68K_WRITE32(name, map)             \
 113 void name(u32 a, u32 d)                         \
 114 {                                               \
 115   uptr v, vs;                                   \
 116   a &= 0x00fffffe;                              \
 117   v = map[a >> M68K_MEM_SHIFT];                 \
 118   vs = v << 1;                                  \
 119   if (map_flag_set(v)) {                        \
 120     ((cpu68k_write_f *)vs)(a, d >> 16);         \
 121     ((cpu68k_write_f *)vs)(a + 2, d);           \
 122   }                                             \
 123   else {                                        \
 124     u16 *m = (u16 *)(vs + a);                   \
 125     m[0] = d >> 16;                             \
 126     m[1] = d;                                   \
 127   }                                             \
 128 }
 129
 130 // 32x
 131 typedef struct {
 132   uptr addr; // stores (membase >> 1) or ((handler >> 1) | (1<<31))
 133   u32 mask;
 134 } sh2_memmap;