100 lines
1.3 KiB
C
100 lines
1.3 KiB
C
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#ifndef __FASTMEM_H__
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#define __FASTMEM_H__
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#include "defs.h"
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#include "mem.h"
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static byte readb(int a)
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{
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byte *p = mbc.rmap[a>>12];
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if (p) return p[a];
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else return mem_read(a);
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}
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static void writeb(int a, byte b)
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{
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byte *p = mbc.wmap[a>>12];
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if (p) p[a] = b;
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else mem_write(a, b);
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}
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static int readw(int a)
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{
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if ((a+1) & 0xfff)
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{
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byte *p = mbc.rmap[a>>12];
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if (p)
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{
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#ifdef IS_LITTLE_ENDIAN
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#ifndef ALLOW_UNALIGNED_IO
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if (a&1) return p[a] | (p[a+1]<<8);
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#endif
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return *(word *)(p+a);
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#else
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return p[a] | (p[a+1]<<8);
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#endif
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}
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}
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return mem_read(a) | (mem_read(a+1)<<8);
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}
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static void writew(int a, int w)
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{
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if ((a+1) & 0xfff)
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{
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byte *p = mbc.wmap[a>>12];
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if (p)
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{
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#ifdef IS_LITTLE_ENDIAN
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#ifndef ALLOW_UNALIGNED_IO
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if (a&1)
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{
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p[a] = w;
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p[a+1] = w >> 8;
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return;
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}
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#endif
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*(word *)(p+a) = w;
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return;
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#else
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p[a] = w;
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p[a+1] = w >> 8;
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return;
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#endif
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}
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}
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mem_write(a, w);
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mem_write(a+1, w>>8);
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}
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static byte readhi(int a)
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{
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return readb(a | 0xff00);
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}
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static void writehi(int a, byte b)
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{
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writeb(a | 0xff00, b);
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}
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#if 0
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static byte readhi(int a)
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{
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byte (*rd)() = hi_read[a];
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return rd ? rd(a) : (ram.hi[a] | himask[a]);
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}
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static void writehi(int a, byte b)
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{
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byte (*wr)() = hi_write[a];
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if (wr) wr(a, b);
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else ram.hi[a] = b & ~himask[a];
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}
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#endif
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#endif
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