Path: utzoo!attcan!uunet!lll-winken!ames!oliveb!amiga!boing!dale
From: dale@boing.UUCP (Dale Luck)
Newsgroups: comp.sys.amiga
Subject: Re: Math Chip Interface
Message-ID: <583@boing.UUCP>
Date: 7 Jan 89 15:26:07 GMT
References: <8901070305.AA02117@terra.oscs.montana.edu>
Reply-To: dale@boing.UUCP (Dale Luck)
Organization: Boing, Milpitas, Ca.
Lines: 55

In article <8901070305.AA02117@terra.oscs.montana.edu> iphwk@MTSUNIX1.BITNET (Bill Kinnersley) writes:
>[In "Re: Math Chip Interface", Dale Luck said:]
>:
>: If there is 680x0 and an 881 as a memory mapped io device then the ieee
>: libraries will talk to the chip as a peripheral device spoon feeding
>: and extracting the numbers.
>
>How do the libraries determine where my 68881 is located in memory?
>(How do *I* determine where it is located?)

You autoconfig software should create a resource structure like the
following and add it via AddResource().
The ieee libraries call OpenResource("MathIEEE.resource",0)
If it succeeds then it checks the contents of the resource structure.
----------------------------------------------------------------
A portion in reproduced here of mathresource.h
This file should be in your V1.3 include files.
struct MathIEEEResource
{
        struct  Node    MathIEEEResource_Node;
        unsigned short  MathIEEEResource_Flags;
        unsigned short  *MathIEEEResource_BaseAddr; /* ptr to 881 if exists */
        void    (*MathIEEEResource_DblBasInit)();
        void    (*MathIEEEResource_DblTransInit)();
        void    (*MathIEEEResource_SglBasInit)();
        void    (*MathIEEEResource_SglTransInit)();
        void    (*MathIEEEResource_ExtBasInit)();
        void    (*MathIEEEResource_ExtTransInit)();
};

/* definations for MathIEEEResource_FLAGS */
#define MATHIEEERESOURCEF_DBLBAS        (1<<0)
#define MATHIEEERESOURCEF_DBLTRANS      (1<<1)
#define MATHIEEERESOURCEF_SGLBAS        (1<<2)
#define MATHIEEERESOURCEF_SGLTRANS      (1<<3)
#define MATHIEEERESOURCEF_EXTBAS        (1<<4)
#define MATHIEEERESOURCEF_EXTTRANS      (1<<5)
---------------------------------------------------------------
If you have a 68881 in your system as a memory mapped device then
a ptr to the base address should be put in MathIEEEResource_BaseAddr.

If you have some other type of ieee math device that is not a 68881 then
this gets a little more complicated. However it should be possible.

>
>
>--
>--Bill Kinnersley
>  Physics Department   Montana State University    Bozeman, MT 59717
>  INTERNET: iphwk@terra.oscs.montana.edu      BITNET: IPHWK@MTSUNIX1


-- 
Dale Luck     GfxBase/Boing, Inc.
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