Commodore Amiga A500 - Page 151

memrw.i-parameter area definition for access to other
processors mem
Copyright
0 1986, Commodore-Amiga Inc., All rights reserved
IFND JANUS-MEMRW-I
JANUS-MEMRW-I SET 1
; this is the parameter block for the JSERV-READPC and JSERV-
; READAMIGA; services - read andtor write the other processors
; memory.
STRUCTURE
MemReadWrite,O
UWORD mm-Command ; see below for list of commands
UWORD
mwCount
; number of bytes to transfer
ULONG
mnvAddress ; local address to access. This is
;
a machine pointer for the 68000, and
;
a segmentlo~ pair for the 808x.
;
The address is arranged so the native
;
processor may read it directly.
UWORD
m~Buffer ; The offset in buffer memory for the
; other buffer.
UWORD mm-Status
; See below for status.
LABEL
MemReadWrite-SIZEOF
; Command definitions:
MRWC-NOP
EQU 0 ; do nothing - return OK status
code
MRWC-READ EQU 1 ; xfer from address to buffer
MRWC-WRITE EQU 2 ; xfer from buffer to address
MRWC-READIO EQU 3 ; only on 808x - read from 10
space
MRWC-WRITE10
EQU 4 ; only on 808x - write to 10 space
MRWC-WRITEREAD EQU 5 ; write from buffer, then read back
; Status definitions:
MRWSINPRCGRESS EQU $ffff ; we've noticed command and
are working on
it
MRWS-OK
EQU $0000 ; completed OK
MRWSACCESSERR EQU
$0001 ; some sort of protection
violation
MRWSBADCMD EQU $0002
; command that the server
doesn't understand
ENDC
l FND JANUSSERVlCESl
JANUSSERVICE5I EQU 1