[uae] Re: E-UAE on PalmOS
- From: Richard Drummond <evilrich@xxxxxxxxxxxxxx>
- To: uae@xxxxxxxxxxxxx
- Date: Wed, 6 Apr 2005 20:22:39 -0500
On Wednesday 06 April 2005 08:10 pm, Richard Drummond wrote:
> On Wednesday 06 April 2005 06:37 am, Henk Jonas wrote:
> > I've fixed it with:
> >
> > STATIC_INLINE uae_u32 get_long(uaecptr addr)
> > {
> > if ((addr >> 16) < MEMORY_BANKS)
> > return longget_1(addr);
> > else
> > return 0;
> > ... <SNIP>
>
> That looks like it'd do the trick.
Actually, thinking about this, what you'd probably want to do is something
like:
#ifdef ADDRESS_SPACE_24BIT
# define MEMORY_BANKS 256
# define MEMORY_RANGE_MASK ((1<<24)-1)
#else
# define MEMORY_BANKS 65536
# define MEMORY_RANGE_MASK (~0)
#endif
And then have the access functions as:
STATIC_INLINE uae_u32 get_long(uaecptr addr)
{
return longget_1(addr & MEMORY_RANGE_MASK);
}
etc. etc.
Basically, you want the top 8 bits of an address to be don't cares on the
68000.
I thought there was something like this tucked away in the code somewhere
already, but some parts of uae are such a rabbit warren it's hard to find
your way aroudn sometimes. Maybe this got lost somewhere along the line.
Cheers,
Rich
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