Specifications

System Macros Invoked by Drivers
REQMPR
REQMPR
Obtains a set of UNIBUS map registers or a set of the first 496 Q22–bus map
registers.
Format
REQMPR
Description
The REQMPR macro calls IOC$REQMAPREG to obtain a set of map registers.
When the REQMPR macro is invoked, the following registers must contain the
following values:
Register Contents
R5 Address of UCB
00(SP) Address of caller’s caller
The REQMPR macro destroys the contents of R0 through R2.
2–61