[CSE]  Advanced Operating Systems 
 COMP9242 2002/S2 
UNSW

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Next: Memory message format Up: 01-l4 Previous: Send message descriptor format

Receive message descriptor format (MIPS)

Format of msg_rcv parameter:

\(m=0\):
by-value receive operation
message string contains only by-value data
*rec msg\(=0\):
receive register data only
*rec msg\(\neq 0\):
message descriptor address
first 8 words of message are in registers
\(m=1\):
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)



Gernot Heiser 2002-08-07