Changes between Version 45 and Version 46 of VirtualMemory

Timestamp:

Oct 19, 2011, 10:41:29 AM (13 years ago)

Author:

alain

Comment:

--

VirtualMemory

@@ -10 +10 @@
 access right verifications. 
 
-The Tsar generic MMU implements a paginated virtual memory, supporting two page sizes : 4 Kbytes pages, and 2 Mbytes pages.   
+The Tsar generic MMU implements a paginated virtual memory, supporting two page sizes : 4 Kbytes pages, and 2 Mbytes pages.
 In order to be independent on the processor core choice, the TLB MISS are handled by an hardwired Finite State Machine (called a Table Walk), without any software action.  
 
@@ -22 +22 @@
 The page table are build by the operating system, and are stored in the main memory. 
 Each execution context (such as an UNIX process) has is own page table.
+The MMU performs the translation from the VPN (Virtual Page Number) to the PPN (Physical Page Number).
+ * For a 4 Kbytes page, the VPN uses 20 bits, and the PPN requires 28 bits.
+ * For a 2 Mbytes page, the PPN uses 11 bits, and the PPN requires 19 bits.
 
 === 1.1 Two levels Page Table structure ===