By Henry M Levy
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Extra resources for Capability-Based Computer Systems
However, this procedure must be able to protect local objects from its callers, and the callers may wish to guarantee that the procedure does not destroy or compromise any of their local objects. The protected procedure meets both of these needs. A process creates a protected procedure by obtaining an entry capability through a supervisor meta-instruction. The entry capability contains a pointer to the C-list of the process that created it. It also contains an index, i, and a range, w, for a set of sequential procedure capabilities within the C-list of the creating process.
A process is the basic execution entity. A process executes within an environment called a sphere of protection or domain. The sphere of protection for a process defines the segments that it can address, the I/O operations that it can perform, and other objects, such as directories, that it can manipulate. As part of its state, a process in the Dennis and Van Horn system contains a pointer to a list of capabilities, called a C-list for short. Each capability in the C-list names an object in the system and specifies the access rights permitted to that object.
In another sense, a codeword names the block of storage it addresses. The logical machine address space seen by the program on the Rice system is totally defined by a list of principal codewords that it can access. The actual maintenance of codewords is provided by the operating system. The basic structure of Rice codewords (omitting unused bits) is shown in Figure 2-3. The physically addressable memory of the Rice machine is divided into several fixed regions, as defined below: • A 64-word table for accumulators, trap addresses, boot code, etc.
Capability-Based Computer Systems by Henry M Levy