Title:
STORING SECURE MODE PAGE TABLE DATA IN SECURE AND NON-SECURE REGIONS OF MEMORY
Document Type and Number:
WIPO Patent Application WO/2011/101660
Kind Code:
A3
Abstract:
Apparatus for data processing (2) is provided with processing circuitry (8) which operates in one or more secure modes (40) and one or more non-secure modes (42). When operating in a non-secure mode, one or more regions of the memory are inaccessible. A memory management unit (24) is responsive to page table data to manage accesses to the memory which includes a secure memory (22) and a non-secure memory (6). Secure mode page table data (36, 38) is used when operating in one of the secure modes. A page table entry within the hierarchy of page tables of the secure mode page table data includes a table security field (68, 72) indicating whether or not a further page table pointed to by that page table entry is stored within the secure memory (22) or the non-secure memory (6). If any of the page tables associated with a memory access are stored within the non-secure memory (6), then the memory access is marked with a table attribute bit NST indicating that the memory access should be treated as non-secure.
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Inventors:
GRISENTHWAITE RICHARD ROY (GB)
Application Number:
PCT/GB2011/050270
Publication Date:
December 08, 2011
Filing Date:
February 14, 2011
Export Citation:
Assignee:
ADVANCED RISC MACH LTD (GB)
GRISENTHWAITE RICHARD ROY (GB)
GRISENTHWAITE RICHARD ROY (GB)
International Classes:
G06F12/10; G06F12/14
Domestic Patent References:
| WO2004046738A2 | 2004-06-03 |
Attorney, Agent or Firm:
ROBINSON, Nigel (120 Holborn, London EC1N 2DY, GB)
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