Changes between Version 5 and Version 6 of TBR/UserApp/MMU_Context

Timestamp:

05/30/09 13:58:39 (15 years ago)

Author:

Aanjhan

Comment:

TBR/UserApp/MMU_Context

@@ -1 +1 @@
 = MMU Context =
 
-
-An MMU context is a data structure containing information wrt the process. The data structure would look something like the below.
-
-A create_mmu_context() function would result in populating this data structure.
+==  Access Lookup Table (ALUT)  ==
 
 
-[[Image(mmu_context_struct.jpg)]]
+The entire address space is split up into various zones with various access attributes like Read only, Full access etc. This information is stored in a look up table inside the cpukit level of the RTEMS architecture. The data structure would have the following information stored. At the beginning we would have this as a static LUT but in the longer vision of the project it could be dynamically updated depending on the task.
 
-The main focus now would be on having a single MMU context for the entire process working. One could have additional services to map an area of "private" memory on a per task basis. This MMU context shall be modified using the mmap* and shm* application calls. 
-
-The design must allow for possibly RTEMS specific calls at application level for additional capabilities also.
+{| class="wikitable" border="1"
+|-
+!  Address Pointer
+!  Address Space Length
+!  Access Attribute
+|}