Patent ID: 7712104
Filing Date: 2010-05-04
Classification: G06F

Abstract:
1. A computer comprising one processor, a memory and an external device, wherein said one processor executes a first operating system (OS) and a second OS, a file constituting the first OS is provided with a common section to which said first OS and said second OS are commonly accessible, when said one processor receives a request for execution of said second OS during execution of said first OS, said one processor allocates said common section so as to be managed by said second OS, whereby a virtual memory space is configured such that said second OS is also accessible to said common section, and thereafter, said one processor switches from said first to said second OS to execute said second OS by using said common section; wherein the virtual memory space is a common area accessible by both the first and second operating systems, but the remainder of the file exclusive of the virtual memory space is accessible by the first operating system only; and wherein the virtual memory space includes an interrupt table, an interrupt handler, and an operating system context table storing data for switching between the first operating system and the second operating system.