摘要:
The present system enables receiving a request from an I/O device to translate a virtual address to a physical address to access the page in system memory. One or more memory attributes of the page defining a cacheability characteristic of the page is identified. A response including the physical address and the cacheability characteristic of the page is sent to the I/O device.
摘要:
The present system enables passing a pointer, associated with accessing data in a memory, to an input/output (I/O) device via an input/output memory management unit (IOMMU). The I/O device accesses the data in the memory via the IOMMU without copying the data into a local I/O device memory. The I/O device can perform an operation on the data in the memory based on the pointer, such that I/O device accesses the memory without expensive copies.
摘要翻译:本系统使得能够通过输入/输出存储器管理单元(IOMMU)将与访问存储器中的数据相关联的指针传递到输入/输出(I / O)设备。 I / O设备通过IOMMU访问存储器中的数据,而不将数据复制到本地I / O设备存储器中。 I / O设备可以基于指针对存储器中的数据执行操作,使得I / O设备访问存储器而不需要昂贵的副本。
摘要:
A central processor unit (CPU) is connected to a system/graphics controller generally comprising a monolithic semiconductor device. The system/graphics controller is connected to an input output (IO) controller via a high-speed PCI bus. The IO controller interfaces to the system graphics controller via the high-speed PCI bus. The IO controller includes a lower speed PCI port controlled by an arbiter within the IO controller. Generally, the low speed PCI arbiter of the IO controller will interface to standard 33 MHz PCI cards. In addition, the IO controller interfaces to an external storage device, such as a hard drive, via either a standard or a proprietary bus protocol. A unified system/graphics memory which is accessed by the system/graphics controller. The unified memory contains both system data and graphics data. In a specific embodiment, two channels, CH0 and CH1 access the unified memory. Each channel is capable of accessing a portion of memory containing graphics data or a portion of memory containing system data.
摘要:
A method for power management is disclosed. The method may include monitoring requests for access to a memory of a memory subsystem by one or more processor cores; and monitoring requests for access to the memory conveyed by an input/output (I/O) unit. The method may further include determining if at least a first amount of time has elapsed since any one of the processor cores has asserted a memory access request and determining if at least a second amount of time has elapsed since the I/O unit has conveyed a memory access request. A first signal may be asserted if the first and second amounts of time have elapsed. A memory subsystem may be transitioned from operating in a full power state to a first low power state responsive to assertion of the first signal.
摘要:
An input/output memory management unit (IOMMU) having an “invalidate all” command available to clear the contents of cache memory is presented. The cache memory provides fast access to address translation data that has been previously obtained by a process. A typical cache memory includes device tables, page tables and interrupt remapping entries. Cache memory data can become stale or be compromised from security breaches or malfunctioning devices. In these circumstances, a rapid approach to clearing cache memory content is provided.
摘要:
A method for power management is disclosed. The method may include monitoring requests for access to a memory of a memory subsystem by one or more processor cores; and monitoring requests for access to the memory conveyed by an input/output (I/O) unit. The method may further include determining if at least a first amount of time has elapsed since any one of the processor cores has asserted a memory access request and determining if at least a second amount of time has elapsed since the I/O unit has conveyed a memory access request. A first signal may be asserted if the first and second amounts of time have elapsed. A memory subsystem may be transitioned from operating in a full power state to a first low power state responsive to assertion of the first signal.
摘要:
A method and apparatus for repopulating a cache are disclosed. At least a portion of the contents of the cache are stored in a location separate from the cache. Power is removed from the cache and is restored some time later. After power has been restored to the cache, it is repopulated with the portion of the contents of the cache that were stored separately from the cache.
摘要:
A method and apparatus for repopulating a cache are disclosed. At least a portion of the contents of the cache are stored in a location separate from the cache. Power is removed from the cache and is restored some time later. After power has been restored to the cache, it is repopulated with the portion of the contents of the cache that were stored separately from the cache.
摘要:
Methods and apparatus for translating messages in a computing system are disclosed. In particular, a disclosed method for converting messages in a computer system includes receiving a command message from a processing unit where the message is defined according to a transport protocol that utilizes command messages using an address to communicate commands to devices in the computer system. The command message is translated to an interface standard by mapping the address into an address field of a packet constructed according to the interface standard. Corresponding apparatus that perform the methods are also disclosed.
摘要:
A central processor unit (CPU) is connected to a system/graphics controller generally comprising a monolithic semiconductor device. The system/graphics controller is connected to an input output (IO) controller via a high-speed PCI bus. The IO controller interfaces to the system graphics controller via the high-speed PCI bus. The IO controller includes a lower speed PCI port controlled by an arbiter within the IO controller. Generally, the low speed PCI arbiter of the IO controller will interface to standard 33 MHz PCI cards. In addition, the IO controller interfaces to an external storage device, such as a hard drive, via either a standard or a proprietary bus protocol. A unified system/graphics memory which is accessed by the system/graphics controller. The unified memory contains both system data and graphics data. In a specific embodiment, two channels, CH0 and CH1 access the unified memory. Each channel is capable of accessing a portion of memory containing graphics data or a portion of memory containing system data.