ST20-C1 datasheet(171/205 Pages) STMICROELECTRONICS

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A.3

Data structures

This section defines the data structures used by the ST20-C1 core.

Name

Word offset

Purpose

ex.HandlerIptr

Exception handler instruction pointer.

ex.InterptdStatus

Interrupted process status register.

ex.InterptdTdesc

Interrupted process task descriptor.

ex.InterptdIptr

Interrupted process instruction pointer.

ex.InterptdWptr

Interrupted process stack pointer.

ex.InterptdCreg

Interrupted process Creg.

ex.InterptdBreg

Interrupted process Breg.

ex.InterptdAreg

Interrupted process Areg.

Table A.3 Exception handler (see Chapter 6)

Name

Word offset

Purpose

pw.Iptr

The instruction pointer.

pw.Wptr

The instruction pointer.

pw.Link

The link to the next process in the list.

Table A.4 Process descriptor block (see section 3.3.4)

Name

Word offset

Purpose

q.BPtrLoc

The last process in the waiting process list.

q.FPtrLoc

The first process in the w aiting process list.

Table A.5 Waiting process list data structure (see section 7.1)

Name

Word offset

Purpose

s.Back

The last process in the semaphore waiting list.

s.Front

The first process in the semaphore w aiting list.

s.Count

The unsigned number of extraprocesses that the semaphore will allow

to continue running on a

wait request.

Table A.6 Semaphore data structure (see section 7.9)

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