memory.h 5.7 KB

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