Abstract:
In a logically partitioned host computer system comprising host processors (host CPUs) partitioned into a pluralityofguest processors (guest CPUs) of a guest configuration, a perform topology function instruction is executed by a guest processor specifying a topology change of the guest configuration. The topology change preferably changes the polarization of guest CPUs, the polarization related to the amount of a host CPU resource is provided to a guest CPU.
Abstract:
A method is provided for determining whether a logical processor of an information processing system has access to an address space of the information processing system. An instruction is issued by a first processor, the instruction referencing a target logical processor and a target address space. In response to the instruction, first information is checked to determine whether the target logical processor is running. When it is determined that the target logical processor is not running, second information is checked by a host program to determine whether the target logical processor has access to the target address space.
Abstract:
A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.
Abstract:
Machine instructions, referred to herein as a long Convert from Zoned instruction (CDZT) and extended Convert from Zoned instruction (CXZT), are provided that read EBCDIC or ASCII data from memory, convert it to the appropriate decimal floating point format, and write it to a target floating point register or floating point register pair. Further, machine instructions, referred to herein as a long Convert to Zoned instruction (CZDT) and extended Convert to Zoned instruction (CZXT), are provided that convert a decimal floating point (DFP) operand in a source floating point register or floating point register pair to EBCDIC or ASCII data and store it to a target memory location.
Abstract:
A facility is provided that, when installed, removes from an architecture a selected architectural function, such that the function is not able to be turned on/off regardless of other controls within the environment. When the facility is installed, the architectural function is not supported when processing in an architectural mode based on the architecture. It is as if the selected architectural function is no longer available in the architecture, and in fact, the code implementing the facility may have been deleted, bypassed, or otherwise eliminated. One such architectural function is virtual address translation, such as dynamic address translation (DAT), and the architecture is, for instance, ESA/390.
Abstract:
Un método para habilitar adaptadores en un entorno de ordenadores, que comprende las etapas de: responder para ejecutar una instrucción de Procesador Lógico de Llamada CLP (400) expedida por un sistema operativo para habilitar un adaptador seleccionado por el sistema operativo, comprendiendo la instrucción CLP un identificador de función (426) que identifica el adaptador y que tiene 5 un indicador de adaptador no habilitado (352), solicitando la instrucción CLP un número de espacios de direcciones de acceso directo a memoria DMA (430) para ser asignados al adaptador, habilitando la ejecución uno o más espacios de dirección DMA y que comprende: a) habilitar el adaptador, en donde la habilitación comprende habilitar el registro para la traducción e interrupción de dirección para el soporte de accesos de memoria directos e interrupciones señalizadas con mensaje para el adaptador, y en donde la habilitación comprende determinar (512) que el número de de espacios de dirección DMA solicitados está disponible comprobando que hay entradas de tabla de dispositivo para el número de espacios de dirección DMA solicitado, y asignar (542) un número de entradas de tabla de dispositivo, correspondiente al número de espacios de dirección de DMA solicitado, al adaptador; y b) devolver (550) el identificador de función que tiene un indicador de adaptador habilitado.
Abstract:
An adapter is enabled for use. The enabling includes assigning one or more address spaces to the adapter, based on a request. For each address space assigned to the adapter, a corresponding device table entry is assigned. When the adapter is no longer needed, it is disabled and the assigned device table entries become available.
Abstract:
Se proporciona una instalación que, cuando es instalada, remueve de una arquitectura una función arquitectónica seleccionada, de modo que la función no pueda ser encendida/apagada sin importar los otros controles dentro del ambiente. Cuando la instalación es instalada, la función arquitectónica no es soportada cuando se procesa en un modo arquitectónico basado en la arquitectura. Es decir, que si la función arquitectónica seleccionada ya no está disponible en la arquitectura, y en efecto, el código que implementa la instalación pudo haber sido borrado, eliminado, o suprimido de otro modo. Una función arquitectónica es la traducción de direcciones virtual, como la traducción de dirección dinámica (DAT), y la arquitectura es, por ejemplo, ESA/390.
Abstract:
A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.