Changes between Version 9 and Version 10 of Projects/MMU_Support

Timestamp:

05/20/09 03:58:47 (15 years ago)

Author:

Aanjhan

Comment:

Projects/MMU_Support

@@ -31 +31 @@
 The middle layer of the implementation would be architecture independent. This would not just be APIs but is also the layer where the functionality of several actions are going to be present. The complete implementation can fit into the cpukit layer of RTEMS software architecture.
 
-One major functionality of this mid-layer is to manage the OS maintained Memory blocks and assign access attributes. These memory blocks shall be grouped by "contexts". For. E.g each task creates a "MMU Context" which points to a data structure (to be defined) of memory blocks. Each memory block then has attributes associated like "read-only", "don't execute" , "cache-inhibit", "cache-write-through" etc. There shall be APIs to generate/modify/remove these memory blocks which can be used by the higher level applications. 
+One major functionality of this mid-layer is to manage the ''''OS maintained Memory blocks'''' and assign access attributes. These memory blocks shall be grouped by "contexts". For. E.g each task creates a "MMU Context" which points to a data structure (to be defined) of memory blocks. Each memory block then has attributes associated like "read-only", "don't execute" , "cache-inhibit", "cache-write-through" etc. There shall be APIs to generate/modify/remove these memory blocks which can be used by the higher level applications. 
 
 Also there shall be another set of APIs which shall be used by the low level BSP functions to extract information with respect to access rights for a particular block, the access attributes to use etc. This information will then be used by the Low level software to update/create the PTE. Also, a mechanism to inform the low level system of any invalidation/removal/change of status of a memory block is needed. This ensures that the PTE are kept upto date in case of removal of any memory areas.
-=  OS Maintained Memory Block (need to find a nice official name for this)  =
-