摘要:
A digital computer system in which data storage is referred to by a descriptor comprising an object number denoting a variable-length block of storage, an offset indicating how far into that block a desired data item begins, and a length field denoting the length of the desired data item. Separate means exist for manipulating each of the three descriptor portions, thus facilitating repetitive operations on related or contiguous operands. Various levels of microcode control are included. Each level of microcode control has its own stack, facilitating interrupts between levels. Stacks are duplicated in "secure stacks" in memory to protect against loss of state data from the stacks.
摘要:
A digital computer system having a memory for storing and providing data including instructions and a processor for processing data in response to the instructions and providing memory operation specifiers to the memory which specify an address of a data item and the memory operation to be performed on it. The instructions in the digital computer system include operation codes belonging to more than one set of operation codes and names representing items to be processed in the operation specified by the operation code. The data in memory further includes name table entries. Each name table entry corresponds to a name and contains information specifying the address of the item represented by the name. The processor includes apparatus for decoding each operation code in response to the operation code and to a dialect value contained in the decoding apparatus which specifies which operation code set the operation code being decoded belongs to. The processor further includes apparatus for processing names by resolving them to produce the addresses specified by their corresponding name table entries and control apparatus responsive to the instruction decoding apparatus and the name processing apparatus for controlling the processor and providing memory operation specifiers containing the addresses produced by the name processing means to the memory.
摘要:
A data processing system having a flexible internal structure, protected from and effectively invisible to users, with multilevel control and stack mechanisms and capability of performing multiple, concurrent operations, and providing a flexible, simplified interface to users. The system is internally comprised of a plurality of separate, independent processors, each having a separate microinstruction control and at least one separate, independent port to a central communications and memory node. The communications and memory node is an independent processor having separate, independent microinstruction control and comprised of a plurality of independently operating, microinstruction controlled processors capable of performing multiple, concurrent memory and communications operations. Addressing mechanisms allow permanent, unique indentification of information as objects and an extremely large address space accessible and common to all such systems. Addresses are independent of system physical configuration and, as particularly described withreference to the invention herein, indentify locations of object information to be accessed by utilizing address formats which comprise an object field, offset field and a length field so that information can be identified to bit granular level and to information type and format. Arithmetic logic unit (ALU) means, also as particularly described with reference to the invention herein, include general register means having three vertically oriented parts for storing such respective fields. Protection mechanisms provide variable access rights associated with individual bodies of information. User language instructions are transformed into dialect coded, uniform, intermediate level instructions to provide equal facility of execution for all user languages. Operands are referred to by uniform format names which are transformed, by internal mechanisms transparent to users, into addresses.
摘要:
A digital computer system in which data operands are represented by names. Each procedure includes a name table, and means are provided to employ the name table to resolve the names into storage addresses at run time. The system also has the ability to run any of a plurality of S-Languages (an S-Language being conceptually similar to a machine language but of higher order); each S-Language can be optimally tailored to a high-order user language. Each procedure includes a dialect code which indicates the dialect of S-Language to which the instructions in the current procedure belong, and the system has provision to execute each procedure accordingly.
摘要:
A digital data processing system has a memory organized into objects containing at least operands and instructions. Each object is identified by a unique and permanent identifier code which identifies the data processing system and the object. The system uses a protection technique to prevent unauthorized access to objects by users who are identified by a subject number which identifies the user, a process of the system for executing a user's procedure, and the type of operation of the system to be performed by the user's procedure. An access control list for each object includes an access control list entry for each subject having access rights to the object and means for confirming that a particular active subject has access rights to a particular object before permitting access to the object. The system also includes stacks for containing information relating to the current state of execution of the system.
摘要:
A digital data processing system including a processor and memory and employing object addressing. The digital data processing system further includes a system for organizing the system's memory into objects and a system for operating the memory. The memory organization system associates each item of data stored in the memory with an object and each object with an object identifier. The memory operation system performs memory operations on items of data in response to memory operation specifiers received from the processor. The location of a data item upon which a memory operation is to be performed is specified by a logical address. Each logical address contains an object number which is temporarily associated with one object identifier and an offset specifying a location in the object identified by the object identifier currently associated with the object number. The memory operation system includes a single object table which specifies the current temporary associations between object numbers and universal addresses and an object identifier conversion system which establishes the temporary associations in the object table and obtains the object identifiers associated with the object numbers. Also disclosed are object tables in digital data processing systems of the present invention involving a single memory and multiple processors and pointers and pointer to logical address conversion means in digital data processing systems of the present invention.
摘要:
An access control system for use in a digital computer system wherein the memory system is organized into objects, a data item is locatable by specifying an object, instructions are contained in procedures, and the operations performed by the system include a call operation for suspending an execution of a procedure and commencing another execution and a return operation for terminating an execution and resuming a suspended execution. The access control system associates each procedure with a domain, i.e., a set of objects accessible to the procedure. The access control system further includes a secure stack object which is accessible only to the access control system. When a call operation commences execution of a procedure which has a different domain, the access control system responds to the call operation by storing information required to return to the current domain in the secure stack. When a return operation resumes execution of a procedure which has a different domain, the access control system responds to the call operation by using the information in the secure stack to return to the previous domain.
摘要:
A digital computer system having a memory system organized into objects for storing data and a processor for processing data in response to instructions. An object identifier is associated with each object. The memory system responds to logical addresses for data which specify the object containing the data and the offset of the data in the object. The objects include procedure objects and data objects. The procedure objects contain procedures including the instructions. Each instruction contains an operation code which belongs to one of several sets of operation codes. All instructions in a single procedure belong to a single operation code set, and associated with each procedure is an operation code set identifier specifying the operation code set to which the instructions in the procedure belongs. Operation codes are decoded in the processor in response to both the operation code and a dialect value representing the operation code set identifier for the operation code set to which the operation code belongs. The dialect value changes only on execution of a call operation or a return operation.
摘要:
A universal addressing system for use in a digital data processing system including a universal memory for storing data including instructions and at least one local system having access to the universal memory. The universal memory is organized into objects, and each item of data is associated with an object. Each object is specified by a unique identifier, and data is addressed by means of a logical address which specifies the UID of the object containing the data and the offset of the data in the object. A processor in the local system responds to instructions by providing memory operation specifiers to the universal memory. Each memory operation specifier specifies a memory operation and a logical address. The offset in the logical address may specify any bit in the object. The memory operation specifier also specifies a length in bits. The universal memory responds to the memory operation specifier by performing the operation specified by the memory operation specifier on the data item beginning at the location specified by the logical address and containing the specified number of bits.
摘要:
An operand processing unit (10) carries out processing of operands in a computer. The unit (10) includes a plurality of operation circuits (12, 14, 16, 18, 20). A source bus (22) provides one operand per clock cycle to the operation circuits (12, 14, 16, 18, 20). A destination bus (24) receives one resultant per clock cycle from the operation circuits (12, 14, 16, 18, 20). Within each operation circuit there is provided an operand processing circuit (80) which performs a selected function with the received operands. These functions include, for example, multiplication, division, addition, subtraction, logical AND, and shift. Logical circuitry provides a priority assignment to the operation circuits (12, 14, 16, 18, 20) for sequencing the loading of operands into the highest priority operation circuit (12, 14, 16, 18, 20) which is not busy processing operands within its corresponding operand processing circuit (80). The operand processing unit (10) provides concurrent processing of operands to enhance processing speed. The operands and resultants are handled in a manner such that there is a uniform and sequential flow of operands from a source, such as main memory, and a uniform and sequential delivery of resultants to a destination, such as a memory or input/output device.