41 results about "Advanced Programmable Interrupt Controller" patented technology

Certain embodiments of the present invention arc directed to providing efficient and easily-applied mechanisms for inter-core and inter-processor communications and inter-core and inter-processor signaling within multi-core microprocessors and certain multi-processor systems. In one embodiment of the present invention, local advanced programmable interrupt controllers within, or associated with, cores of a multi-core microprocessor and/or processors of a multi-processor system are enhanced so that the local advanced programmable interrupt controllers can be configured to automatically generate inter-core and inter-processor interrupts when WRITE operations are directed to particular regions of shared memory.

An advanced programmable interrupt controller (APIC) identification (ID) configuration method is applied to a multiprocessor computer system. The method assigns a postponed ID to each CPU's APIC IDs respectively during the initialization. Plural reserved IDs are assigned to the I/O APICs. A multiprocessor configuration table in a basic input output system (BIOS) will be updated with renewed ID configuration, to avoid an ID conflict when processing the interrupt request from the peripheral devices and raise the stability of the multiprocessor computer system.

The embodiment of the invention discloses an interrupt realization method between virtual processors. The method comprises the following steps that when a source virtual processor needs to trigger the interrupt to a target virtual processor, the information comprising the target virtual processor and registering data used for expressing indication data of the interrupt triggered from the source virtual processor to the target virtual processor are written into a virtual register of a vAPIC (virtual advanced programmable interrupt controller) of the source virtual processor so that a virtual machine monitor analyzes the information of the target virtual processor and the indication data from the virtual register, and in addition, the virtual machine monitor fills the interrupt between the virtual processors into the target virtual processor according to the indication data and the information of the target virtual processor. Correspondingly, the embodiment of the invention also provides a relevant virtual machine, a virtual controller, a calculation node and a system. The performance of the virtual machine can be improved according to the embodiment of the invention.

Methods and computer-executable components for real-time scheduling of CPU resources are disclosed. A performance counter determines when to allocate CPU resources to a thread. When it is time to allocate the CPU resources, the performance counter issues a non-maskable interrupt to an advanced programmable interrupt controller (APIC). The APIC then issues a non-maskable interrupt to the CPU. In response to receiving the non-maskable interrupt, the CPU allocates resources to the thread.

A control interruption method for application program interception and monitoring systems, comprises: A hardware interruption request number of a system control interruption that is taken by an application program from a Basic Input and Output System (BIOS); an interruption vector number that corresponds with the hardware interruption request number, and acquired by the application program in a corresponding way according to that the interruption mode is a programmable interruption controller mode, or an advanced programmable interruption controller mode; a plurality of interruption service program examples that modify interruption entrance in an interruption description symbol list in a Central Process Unit (CPU) corresponds with interruption vector number, into pointing to application programs; as well as a plurality of interruption events corresponding with initialization information that is pre-established according to an interruption and interception list in the application program, and initialization hardware interruption request number.

The invention relates to a two-stage scheduling method of real-time extension of the Windows system. According to the method, by means of affinity settings of the Windows system, reallocating the CPU (Central Processing Unit) resources of the system, and specifying a running core of real-time tasks in order to ensure resources needed by the real-time tasks; setting an IOAPIC(I/O Advanced Programmable Interrupt Controller) redirection table to enable external interrupt to point to specific core processing and to not affect the operation of real-time kernel; meanwhile, using a clock interrupt counter of Local APIC (Advanced Programmable Interrupt Controller) to provide task scheduling with high-precision clock signals; using WinDbg to obtain operation function entry addresses of the process and the thread of Windows from NTDLL to be packaged as DLL, and forming a basic interface of task control; locking and mapping kernel task control blocks and task queues to enable the writing and debugging of a scheduling algorithm can be performed in a user mode, and finally linking into the interrupt handling routine of the high-precision clock of the Local APIC so as to complete the real-time kernel scheduling algorithm.

The invention discloses a method for implementing a high-accuracy low-CPU (central processing unit)-occupancy timer under Pentium IV architecture of the Windows operating system, relates to the technical field of timer software development of the Windows operating system and aims to design a timer high in accuracy and low in CPU resources occupancy to solve the technical problem of failure in realizing high accuracy and low CPU resources occupancy during Windows multi-task time division operation. By adopting 8254 chips in a chip set of a PC (personal computer) under Pentium IV architecture and writing 8254 interrupt timer driving program and APIC (advanced programmable interrupt controller) program, an interrupt based clock timer is realized in the Windows. By defining an interrupt processing function, changing interrupt door structure in an interrupt descriptor table and valuating the door structure by a pointer of the self-defined interrupt processing function, calling of user-defined interrupt processing functions is realized, and applicable timer is realized. After test, timing accuracy can reach submillimeters, timing offset is smaller than 7 microseconds when timing is 100 microseconds, CPU occupancy is quite low, and most timing application requirements of the Windows system are met.

In some embodiments, the invention involves a dynamic interrupt route discovery method with local APIC (Advanced Programmable Interrupt Controller) retriggering to accommodate architectures that are not PC/AT compatible. In a mobile Internet device (MID) General Purpose Input/Output (GPIO) pins are dynamically allocated and IRQs are retriggered by a GPIO driver to multiplex the requests to an appropriate device. Other embodiments are described and claimed.

A virtual machine monitor, a virtual machine system and a clock distribution method thereof. The clock distribution method includes: distributing real clock resource to a Guest Operation System (GOS), and saving correspondence between said GOS and said real clock resource; intercepting an access operation of said GOS to a virtual clock resource; sending said access operation to the corresponding real clock resource according to said correspondence, and then performing a write operation, or injecting an interrupt of said real clock resource into a local Advanced Programmable Interrupt Controllers (APIC) of a virtual CPU of the corresponding GOS of said GOSs.

The present invention discloses a virtual machine system and a visit processing method of an advanced programmable interruption controller. The method includes an address mapping procedure in which a virtual machine monitor sets up an APIC virtual register space and a table mapping of APIC initial address and adds the address mapping table to the table of a virtual machine client operating system; an APIC visit control procedure in which the client operating system carries out the visit by compulsorily involving in the virtual machine monitor when visiting the first type register of APIC, and conducts the direct visit according to the address mapping table when visiting the second type register of APIC. The operation of the first type register can result in the change of other registers of APIC and the operation of the second type register can not affect other registers of APIC. The present invention greatly shortens the visit cycle of APIC and simplifies the operation.

In some embodiments, the invention involves a system and method to enable a mobile device to utilize self-clocking during boot. In at least one embodiment, a platform has at least one processor core coupled to an internal timer. For an X86 processor, the internal timer may reside in an advanced programmable interrupt controller. A boot kernel executing on the platform is configured to use the internal timer early in the boot phase, when the platform is not compliant with legacy PC/AT architecture. If the platform does conform to the legacy architecture, then the boot may use an external clock for timing and clocking early in boot. In both cases, the internal timer is calibrated to the external clock before completing the boot phase. Other embodiments are described and claimed.

Following a restart or a reboot of a system that includes a multi-core processor, the multi-core processor may assign each active and eligible core a unique advanced programmable interrupt controller (APIC) identifier (ID). Initialization logic may detect a state of each of the plurality of processing cores as active or inactive. The initialization logic may detect an attribute of each of the plurality of processing cores as eligible to be assigned an APIC ID or as ineligible to be assigned the APIC ID.

An apparatus including first and second reservation stations. The first reservation station dispatches a load micro instruction, and indicates on a hold bus if the load micro instruction is a specified load micro instruction directed to retrieve an operand from a prescribed resource other than on-core cache memory. The second reservation station is coupled to the hold bus, and dispatches one or more younger micro instructions therein that depend on the load micro instruction for execution after a number of clock cycles following dispatch of the first load micro instruction, and if it is indicated on the hold bus that the load micro instruction is the specified load micro instruction, the second reservation station is configured to stall dispatch of the one or more younger micro instructions until the load micro instruction has retrieved the operand. The resources include an advanced programmable interrupt controller (APIC), configured to perform interrupt operations.