ST20-C1 datasheet(137/205 Pages) STMICROELECTRONICS

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8 Instruction Set Reference

run

run process

Code: 23 F3

Description: Spawn a new process. Add the new process to the back of the process

queue defined b y the control block at

SchedulerQptr. The task descriptor of the

process is in Areg; this identifies the process descr iptor block. The instruction pointer

and work space pointer must have been written in the process descriptor block of the

process at offsets pw.Iptr and pw.Wptr words.

Definition:

if (

run trap handler installed)

take run trap

else

{

if (word [SchedulerQptr @ q.FPtrLoc] = NotProcess)

-- queue is empty

{

word

′[SchedulerQptr @ q.FPtrLoc] ← Areg

word

′[SchedulerQptr @ q.BPtrLoc] ← Areg

}

else

{

word

′[ word [SchedulerQptr @ q.BPtrLoc] @ pw.Link]

← Areg

word

′[SchedulerQptr @ q.BPtrLoc] ← Areg

}

Areg

′← undefined

Breg

′← undefined

Creg

′← undefined

}

Status Register:

No effect

Comments:

Secondary instruction.

Areg must be word aligned (i.e. divisible by 4).

This instruction may require up to three on-chip memory accesses and one off-

chip. This may affect interrupt latency.

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