[특허]System for protecting supervisor mode data from user code

System for protecting supervisor mode data from user code 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-012/00
출원번호	US-0719761 (2010-03-08)
등록번호	US7984257 (2011-07-06)
발명자 / 주소	Funk, David William Gauke, Barry
출원인 / 주소	Silverbrook Research Pty Ltd
인용정보	피인용 횟수 : 8 인용 특허 : 8

초록 ▼

A system for protecting supervisor mode data from user code having a processor which implements a register window architecture supporting as separate window stacks for supervisor and user modes with a transition window in one of the window stacks set with at least one invalid window bit in an invalid window mask of the architecture additional to an invalid window bit set for a reserved window of the invalid window mask for transitioning from the supervisor mode to the user mode, supervisor mode-only memory storing the supervisor mode window stack, and user mode accessible memory storing the supervisor and user mode window stacks.

대표청구항 ▼

The invention claimed is: 1. A system for protecting supervisor mode data from user code, the system comprising: a processor which implements a register window architecture having separate register window stacks for supervisor and user modes with a transition window in one of the register window stacks set with at least one invalid window bit in an invalid window mask of the architecture additional to an invalid window bit set for a reserved window of the invalid window mask for transitioning from the supervisor mode to the user mode, wherein a unique numerical label is assigned to each register window of the register window stacks starting from 0 and increasing monotonically for every save, the assigned labels being inaccessible to user code and being used to access the invalid window bits of the register windows.

이 특허에 인용된 특허 (8)

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Lafky, Joby S., Method and system for enabling a printing program to communicate with a printer.
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Parry,Travis J.; Sesek,Robert, Methods and systems for providing firmware to a printing device.
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Isono, Jun; Takagi, Atsuhiro; Hirota, Atsushi, Print head for piezoelectric ink jet printer, piezoelectric actuator therefor, and process for producing piezoelectric actuator.
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Swanberg, Randal Craig; Williams, Michael Stephen, Stack memory protection.
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Bonola Thomas J., System and method for using a real mode bios interface to read physical disk sectors after the operating system has load.
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이 특허를 인용한 특허 (8)

Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy; Craske, Simon John, Data processing apparatus and method for protecting secure data and program code from non-secure access when switching between secure and less secure domains.
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Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy; Craske, Simon John, Data processing apparatus and method for protecting secure data and program code from non-secure access when switching between secure and less secure domains.
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Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy, Data processing apparatus and method using secure domain and less secure domain.
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Grocutt, Thomas Christopher, Exception handling in a data processing apparatus having a secure domain and a less secure domain.
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Grocutt, Thomas Christopher, Exception handling in a data processing apparatus having a secure domain and a less secure domain.
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Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy, Exception handling in a data processing apparatus having a secure domain and a less secure domain.
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Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy, Maintaining secure data isolated from non-secure access when switching between domains.
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Grocutt, Thomas Christopher; Grisenthwaite, Richard Roy, Maintaining secure data isolated from non-secure access when switching between domains.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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System for protecting supervisor mode data from user code 원문보기