JPS55116155A - Memory protective system - Google Patents
Memory protective systemInfo
- Publication number
- JPS55116155A JPS55116155A JP2410879A JP2410879A JPS55116155A JP S55116155 A JPS55116155 A JP S55116155A JP 2410879 A JP2410879 A JP 2410879A JP 2410879 A JP2410879 A JP 2410879A JP S55116155 A JPS55116155 A JP S55116155A
- Authority
- JP
- Japan
- Prior art keywords
- unit
- access
- control part
- memory
- attained
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Storage Device Security (AREA)
Abstract
PURPOSE: To make it possible to give effect to strict memory protection of even one user's-program area, by setting an access right, which can be given at a user's- program level, by one unit in a main memory area.
CONSTITUTION: An instruction from instruction control part 7 is sent to instruction register 9, whose content is also sent to memory control part 11. Control part 11 generates an address at which access to memory unit 15 can be attained, and a check on whether access to the area of unit 15 the address indicates can be attained or not is made by a protective key. When the access can be attained, data read out from unit 15 is sent to access right control part 201. In access right data memory part 204, control part 201 writes protective bits on an initially-set access right setting unit. The output of memory part 204 is bit-checked by access right check part 205 according to instructions of register 9 and the result is inputted to unit 15 as a signal showing whether access to unit 15 can be attained or not by way of access control part 14.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2410879A JPS55116155A (en) | 1979-02-28 | 1979-02-28 | Memory protective system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2410879A JPS55116155A (en) | 1979-02-28 | 1979-02-28 | Memory protective system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55116155A true JPS55116155A (en) | 1980-09-06 |
Family
ID=12129136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2410879A Pending JPS55116155A (en) | 1979-02-28 | 1979-02-28 | Memory protective system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55116155A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57195394A (en) * | 1981-05-23 | 1982-12-01 | Nippon Telegr & Teleph Corp <Ntt> | Memory protection system by processor |
JPS592159A (en) * | 1982-06-28 | 1984-01-07 | Fujitsu Ltd | Data controlling system |
-
1979
- 1979-02-28 JP JP2410879A patent/JPS55116155A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57195394A (en) * | 1981-05-23 | 1982-12-01 | Nippon Telegr & Teleph Corp <Ntt> | Memory protection system by processor |
JPS592159A (en) * | 1982-06-28 | 1984-01-07 | Fujitsu Ltd | Data controlling system |
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