The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 2006
Filed:
Mar. 14, 2002
Thomas J. Bonola, Tomball, TX (US);
Thomas J. Bonola, Tomball, TX (US);
Hewlett-Packard Development Company, LP., Houston, TX (US);
Abstract
In a computer system having at least one host processor, a method and apparatus for providing seamless hooking and interception of selected entrypoints includes finding the IDT for each CPU which can include scanning the HAL image for the HAL PCR list. Saving the interrupt handler currently mapped in the CPU's interrupt descriptor table. Patching the original interrupt into the new interrupt handler. Storing the new interrupt exception into the CPU's interrupt descriptor table. Hooking a select entrypoint by first determining if the entrypoint begins with a one byte instruction code. If it does, saving the address of the original entrypoint, saving the original first one byte instruction, and patching the new interrupt intercept routine to jump to the original entrypoint's next instruction.