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- W4233448680 abstract "Traditional methods of providing protection in memory systems do so at the cost of increased context switch time and/or increased storage to record access permissions for processes. With the advent of computers that supported cycle-by-cycle multithreading, protection schemes that increase the time to perform a context switch are unacceptable, but protecting unrelated processes from each other is still necessary if such machines are to be used in non-trusting environments. This paper examines guarded pointers , a hardware technique which uses tagged 64-bit pointer objects to implement capability-based addressing. Guarded pointers encode a segment descriptor into the upper bits of every pointer, eliminating the indirection and related performance penalties associated with traditional implementations of capabilities. All processes share a single 54-bit virtual address space, and access is limited to the data that can be referenced through the pointers that a process has been issued. Only one level of address translation is required to perform a memory reference. Sharing data between processes is efficient, and protection states are defined to allow fast protected subsystem calls and create unforgeable data keys." @default.
- W4233448680 created "2022-05-12" @default.
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- W4233448680 date "1994-11-01" @default.
- W4233448680 modified "2023-10-18" @default.
- W4233448680 title "Hardware support for fast capability-based addressing" @default.
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- W4233448680 doi "https://doi.org/10.1145/381792.195579" @default.
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