CPU Modes

CPU Modes

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. CPU modes are operating modes for the central processing unit of some computer architectures that place restrictions on the type and scope of operations that can be performed by certain processes being run by the CPU. This design allows the operating system to run with more privileges than application software. Ideally, only highly-trusted kernel code is allowed to execute in the unrestricted mode; everything else run in a restricted mode and must use a system call to request the kernel perform on its behalf any operation that could damage or compromise the system, making it impossible for untrusted programs to alter or damage other programs. In practice, however, system calls take time and can hurt the performance of a computing system, so it is not uncommon for system designers to allow some time-critical software to run with full kernel privileges.
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Product details

  • Paperback | 84 pages
  • 152 x 229 x 5mm | 136g
  • United States
  • English
  • 6136642190
  • 9786136642192