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Protection domains for a computer operating system

  • US 7,213,247 B1
  • Filed: 01/10/2000
  • Issued: 05/01/2007
  • Est. Priority Date: 01/10/2000
  • Status: Expired due to Term
First Claim
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1. A method, comprising the steps of:

  • loading a code module into a memory space of a first domain, wherein the first domain owns one of a kernel space and a portion of a user space, the code module including an instruction having a symbol reference;

    determining if the symbol reference is to an external location outside of the memory space;

    generating a link stub for the symbol reference when the symbol reference is to an external location to access the external location;

    redirecting the instruction to the link stub; and

    determining if the external location is within a second domain that is within a protection view of the first domain, wherein the second domain owns the other one of the kernel space and a portion of the user space;

    requesting attachment of the second domain to the first domain when the second domain is determined not to be within the protection view of the first domain; and

    attaching the second domain to the first domain using an attachment mechanism.

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