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School of Computer Science & Engineering
University of New South Wales
 Advanced Operating Systems 
 COMP9242 2002/S2 

Receive message descriptor format (MIPS)

Format of msg_rcv parameter:

:

by-value receive operation
message string contains only by-value data

*rec msg:

receive register data only

*rec msg:

message descriptor address
first 8 words of message are in registers

:

fpage receive operation
*rcv msg is not a pointer but contains the fpage describing where to map incoming fpages
registers pass sender's register values (incl. fpage descriptors)