Subversion Repositories HelenOS-historic

Rev

Rev 534 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 534 Rev 703
Line 1... Line 1...
1 
Memory management
 1 
Memory management
2 
=================
 2 
=================
3 
 
 3 
 
- 
 
 4 
1. Virtual Address Translation
- 
 
 5 
 
- 
 
 6 
1.1 Hierarchical 4-level per address space page tables
- 
 
 7 
 
4 
SPARTAN kernel deploys generic interface for 4-level page tables,
 8 
SPARTAN kernel deploys generic interface for 4-level page tables
- 
 
 9 
for these architectures: amd64, ia32, mips32 and ppc32. In this
5 
no matter what the real underlying hardware architecture is.
 10 
setting, page tables are hierarchical and are not shared by
- 
 
 11 
address spaces (i.e. one set of page tables per address space).
6 
 
 12 
 
7 
 
 13 
 
8 
 VADDR
 14 
 VADDR
9 
 +-----------------------------------------------------------------------------+
 15 
 +-----------------------------------------------------------------------------+
10 
 |   PTL0_INDEX  |   PTL1_INDEX   |   PTL2_INDEX   |   PTL3_INDEX   |   OFFSET |
 16 
 |   PTL0_INDEX  |   PTL1_INDEX   |   PTL2_INDEX   |   PTL3_INDEX   |   OFFSET |
Line 48... Line 54...
48 
 
 54 
 
49 
 
 55 
 
50 
On architectures whose hardware has fewer levels, PTL2 and, if need be, PTL1 are
 56 
On architectures whose hardware has fewer levels, PTL2 and, if need be, PTL1 are
51 
left out. TLB-only architectures are to define custom format for software page
 57 
left out. TLB-only architectures are to define custom format for software page
52 
tables.
 58 
tables.
- 
 
 59 
 
- 
 
 60 
 
- 
 
 61 
 
- 
 
 62 
1.2 Single global page hash table
- 
 
 63 
 
- 
 
 64 
Generic page hash table interface is deployed on 64-bit architectures without
- 
 
 65 
implied hardware support for hierarchical page tables, i.e. ia64 and sparc64.
- 
 
 66 
There is only one global page hash table in the system shared by all address
- 
 
 67 
spaces.