Abstract:
PROBLEM TO BE SOLVED: To use a single physical register file under an alias to execute a floating point instruction and a pack data instruction. SOLUTION: A first instruction is received, it is determined whether the first instruction is the floating point instruction or a second type instruction, and it is determined whether a processor including first and second pairs of physical registers is in a floating point mode or in a second type mode. If the processor is in the second type mode when the first instruction is the floating point instruction, transition to the floating point mode is carried out, and the floating point instruction is operated by using the first pair of physical registers. If the processor is not in the floating point mode, transition to the second type mode is carried out, and the second type instruction is operated by using the second pair of physical registers partially under an alias to the first pair of physical registers so that the first pair of physical registers and the second pair of physical registers appear to be a single logical register file logically. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To guarantee secure execution of a computer against various types of threats.SOLUTION: An apparatus for secure execution using a secure memory partition comprises: a non-volatile memory to store a verification execution instruction 242; a system memory 220 having a secure partition 223; and a processor 210 coupled to the non-volatile memory and the system memory 220. The processor 210 comprises: an on-chip basic input/output system (BIOS) 215 including a bootstrap security logic 241; and an execution unit 211 coupled to the on-chip BIOS 215 and the system memory 220 and configured to perform operation specified by the bootstrap security logic 241. The operation includes a step of copying the verification execution instruction 242 from the non-volatile memory to the secure partition and a step of verifying the authenticity of the verification execution instruction 242.
Abstract:
PROBLEM TO BE SOLVED: To install a set of instructions in a processor for processing pack data for furnishing compatibility with existing software and hardware. SOLUTION: For executing both of a set of pack data instructions and a set of floating point instructions on contents, which are aliased partially at least and correspond to a plurality of tags, of a single logical register file, the set of pack data instructions are executed before execution of the set of floating point instructions. At a certain time between a start of execution of a first instruction in the set of pack data instructions and execution of a first instruction in the set of floating point instructions, a plurality of tags matching an alias register in at least a single logical register file are changed into a non-empty condition, and the tags determine whether the register in a signal logical register file is empty or not. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To perform a shift operation on a packed data type. SOLUTION: An apparatus for arithmetic operation is provided with: a shifter which performs a shift operation on a first packed data having a plurality of first data elements by a shift count in order to produce a second packed data having a plurality of second data elements; and a correction circuit which replaces at least one number of each of the plurality of second data elements and replaces all the replaced numbers corresponding to the shifted data element with number having the same value even in any data element of the shifted data elements. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To propose a method and a device for a transition instruction to a register file. SOLUTION: A transition instruction marking the end of a block including a pack data instruction operated to data stored in a logic register is received. A register in a logic register file shows whether a plurality of tags related to the logic register file are empty or not by responding to execution of a scalar floating point instruction for changing the data included in the logic register file. The plurality of tags come to show empty in response to the transition instruction. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To incorporate a set of instructions for processing packed data in a processor so as to have compatibility with existing software and hardware. SOLUTION: Both of a set of packed data instructions are performed before performance of floating point instruction to contents of a single logic register file which is at least partially aliased and to which a plurality of tags correspond, at a point of time between staring of performance of a first instruction of the packed data instruction set and completion of performance of a first instruction of a floating point instruction set, the plurality of tags corresponding to the aliased register in at least a single logic register file are changed to a not empty state and the tag identifies whether or not the register in the single logic register file is empty. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To execute a function for multiplying two complex numbers by one multiply accumulate instruction. SOLUTION: A multiply-add circuit includes first (810), second (811), third (812), and fourth multipliers (813), wherein each of the multipliers receives a corresponding set of the above data elements. The multiply-add circuit further includes a first adder (850) coupled to the first and second multipliers (810 and 811), and second adder (851) coupled to the third and fourth multipliers (812 and 813). A third storage area (871) is coupled to the adders (850 and 851). The third storage area (871) includes a first and second field for saving output of the first and second adders (850 and 851), respectively, as first and second data elements of a third packed data. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
In one embodiment, a method of remote attestation for a special mode of operation. The method comprises storing an audit log within protected memory of a platform. The audit log is a listing of data representing each of a plurality of IsoX software modules loaded into the platform. The audit log is retrieved from the protected memory in response to receiving a remote attestation request from a remotely located platform. Then, the retrieved audit log is digitally signed to produce a digital signature for transfer to the remotely located platform.
Abstract:
A technique is provided to execute isolated instructions according to an embodiment of the present invention. An execution unit executes an isolated instruction in a processor operating in a platform. The processor is configured in one of a normal execution mode and an isolated execution mode. A parameter storage containing at least one parameter to support execution of the isolated instruction when the processor is configured in the isolated execution mode.
Abstract:
A processor capable of secure execution. The processor contains an execution unit and secure partition logic that secures a partition in memory. The processor also contains cryptographic logic coupled to the execution unit that encrypts and decrypts secure data and code.