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