Processor system and methods of triggering a block move using a system bus write command initiated by user code

• Main Authors: Arimilli, Lakshminarayana Baba, Bass, Brian Mitchell, Cummings, David Wayne, Drerup, Bernard Charles, Guthrie, Guy Lynn, Kalla, Ronald Nick, Shen, Hugh, Siegel, Michael Steven, Starke, William John, Williams, Derek Edward
• Format: Patent
• Language: English
• Published: 02.10.2012

A technique for triggering a system bus write command with user code includes identifying a specific store-type instruction in a user instruction sequence. The specific store-type instruction is converted into a specific request-type command, which is configured to include core permission controls (that are stored in core configuration registers of a processor core by a trusted kernel) and user created data (stored in a cache memory). Slave devices are configured through register space (that is only accessible by the trusted kernel) with respective slave permission controls. The specific request-type command is then transmitted from the cache memory, via a system bus. In this case, the slave devices that receive the specific request-type command process the specific request-type command when the core permission controls are the same as the respective slave permission controls. The trusted kernel may be included in a hypervisor or an operating system.