User`s manual

.FORKMPU Function

5-93

5System Calls

.FORKMPU Function

Note This is a PPC1Bug system call for MVME4600 series or

Dual Processor MTX motherboards.

Name

.FORKMPU - Fork MPU (Multiple MPU Configuration)

Code

$0100

Description

.FORKMPU allows you to Fork (execute target code) on an MPU

that is idle. The MPU register R1 is set to the user stack space.

Interrupts are also disabled at the processor MSR register.

Entry Conditions

R03 ==> MPU number (i.e., 0-1)

R04 ==> Instruction Pointer of target code

Exit Conditions Different from Entry

R03 ==> 0, successful fork

-1, processor not idle

-2, null or not word-aligned IP

-3, invalid processor number

R04 ==> No change