By Iain D. Craig
The kernel of any working process is its most crucial part, because the remainder of the procedure will depend on it. This e-book indicates how the formal specification of kernels might be through a totally formal refinement procedure that results in the extraction of executable code. This formal refinement strategy guarantees that the code accurately meets the specification. the writer files the total procedure, together with proofs.
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Extra info for Formal Refinement of Operating System Kernels
When the ﬁrst process is executed, where do the outgoing registers come from? To solve this problem, we deﬁne the following operation 26 3 A Simple Kernel HalfContextSwitch ∆HARDWARE ΞPTAB inproc? ) for every register that must be used by the process inproc?. Finally, it is assumed that when a context switch is to occur, an interrupt is raised. On many processors, when an interrupt is raised, the program counter of the interrupting process is stored on the stack. On other processors, the program counter is stored in a well-deﬁned location, usually in a designated register (as it is on MIPS processors).
To solve this problem, we deﬁne the following operation 26 3 A Simple Kernel HalfContextSwitch ∆HARDWARE ΞPTAB inproc? ) for every register that must be used by the process inproc?. Finally, it is assumed that when a context switch is to occur, an interrupt is raised. On many processors, when an interrupt is raised, the program counter of the interrupting process is stored on the stack. On other processors, the program counter is stored in a well-deﬁned location, usually in a designated register (as it is on MIPS processors).
Theorem 1. ∀ PTAB ; PTAB 1 • PTAB 1Init ∧ AbsPTAB 1 ⇒ PTABInit. Proof. By the predicate of AbsPTAB 1, dom freech = PID \ used . The universally quantiﬁed formula in PTAB 1Init’s predicate implies that maxpid ∈ dom freech and for all p < maxpid , p ∈ dom freech . This implies that PID = dom freech , so, by the abstraction relation, used = ∅. ✷ Until the end of this section, reﬁnement proofs are presented, two for each operation that is reﬁned. The proofs are the standard ones (cf.  or ).