mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
45f2f245f5
Still need to fix asm and protection emulation. git-svn-id: file:///home/notaz/opt/svn/PicoDrive@769 be3aeb3a-fb24-0410-a615-afba39da0efa
119 lines
4.9 KiB
C
119 lines
4.9 KiB
C
// memory map related stuff
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define M68K_MEM_SHIFT 16
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// minimum size we can map
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#define M68K_BANK_SIZE (1 << M68K_MEM_SHIFT)
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#define M68K_BANK_MASK (M68K_BANK_SIZE - 1)
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extern unsigned long m68k_read8_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long m68k_read16_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long m68k_write8_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long m68k_write16_map[0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long s68k_read8_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long s68k_read16_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long s68k_write8_map [0x1000000 >> M68K_MEM_SHIFT];
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extern unsigned long s68k_write16_map[0x1000000 >> M68K_MEM_SHIFT];
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void z80_map_set(unsigned long *map, int start_addr, int end_addr,
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void *func_or_mh, int is_func);
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void cpu68k_map_set(unsigned long *map, int start_addr, int end_addr,
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void *func_or_mh, int is_func);
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void cpu68k_map_all_ram(int start_addr, int end_addr, void *ptr, int is_sub);
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void m68k_map_unmap(int start_addr, int end_addr);
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// top-level handlers that cores can use
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// (or alternatively build them into themselves)
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// XXX: unhandled: *16 and *32 might cross the bank boundaries
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typedef u32 (cpu68k_read_f)(u32 a);
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typedef void (cpu68k_write_f)(u32 a, u32 d);
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#define MAKE_68K_READ8(name, map) \
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u32 name(u32 a) \
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{ \
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unsigned long v; \
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a &= 0x00ffffff; \
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v = map[a >> M68K_MEM_SHIFT]; \
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if (v & 0x80000000) \
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return ((cpu68k_read_f *)(v << 1))(a); \
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else \
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return *(u8 *)((v << 1) + (a ^ 1)); \
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}
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#define MAKE_68K_READ16(name, map) \
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u32 name(u32 a) \
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{ \
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unsigned long v; \
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a &= 0x00fffffe; \
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v = map[a >> M68K_MEM_SHIFT]; \
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if (v & 0x80000000) \
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return ((cpu68k_read_f *)(v << 1))(a); \
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else \
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return *(u16 *)((v << 1) + a); \
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}
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#define MAKE_68K_READ32(name, map) \
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u32 name(u32 a) \
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{ \
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unsigned long v, vs; \
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u32 d; \
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a &= 0x00fffffe; \
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v = map[a >> M68K_MEM_SHIFT]; \
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vs = v << 1; \
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if (v & 0x80000000) { \
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d = ((cpu68k_read_f *)vs)(a) << 16; \
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d |= ((cpu68k_read_f *)vs)(a + 2); \
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} \
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else { \
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u16 *m = (u16 *)(vs + a); \
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d = (m[0] << 16) | m[1]; \
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} \
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return d; \
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}
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#define MAKE_68K_WRITE8(name, map) \
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void name(u32 a, u8 d) \
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{ \
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unsigned long v; \
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a &= 0x00ffffff; \
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v = map[a >> M68K_MEM_SHIFT]; \
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if (v & 0x80000000) \
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((cpu68k_write_f *)(v << 1))(a, d); \
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else \
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*(u8 *)((v << 1) + (a ^ 1)) = d; \
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}
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#define MAKE_68K_WRITE16(name, map) \
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void name(u32 a, u16 d) \
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{ \
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unsigned long v; \
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a &= 0x00fffffe; \
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v = map[a >> M68K_MEM_SHIFT]; \
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if (v & 0x80000000) \
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((cpu68k_write_f *)(v << 1))(a, d); \
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else \
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*(u16 *)((v << 1) + a) = d; \
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}
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#define MAKE_68K_WRITE32(name, map) \
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void name(u32 a, u32 d) \
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{ \
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unsigned long v, vs; \
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a &= 0x00fffffe; \
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v = map[a >> M68K_MEM_SHIFT]; \
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vs = v << 1; \
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if (v & 0x80000000) { \
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((cpu68k_write_f *)vs)(a, d >> 16); \
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((cpu68k_write_f *)vs)(a + 2, d); \
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} \
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else { \
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u16 *m = (u16 *)(vs + a); \
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m[0] = d >> 16; \
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m[1] = d; \
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} \
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}
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