Sun Microsystems UltraSPARC-I User Manual page 37

raSPARC User's Manual
63
63
63
4M-byte Virtual Page Number
63
Figure 4-1 Virtual-to-physical Address Translation for all Page Sizes
UltraSPARC implements a 44-bit virtual address space in two equal halves at the
extreme lower and upper portions of the full 64-bit virtual address space. Virtual
addresses between 0000 0800 0000 0000
are termed "out of range" for UltraSPARC and are illegal. (In other words, virtual
address bits VA<63:43> must be either all zeros or all ones.) Figure 4-2 on page 23
illustrates the UltraSPARC virtual address space.
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8K-byte Virtual Page Number
8K-byte Physical Page Number
40
64K-byte Virtual Page Number
MMU
64K-byte Physical Page Number
40
512K-byte Virtual Page Number
MMU
512K-byte PPN
40
MMU
4M-byte PPN
40
Page Offset
13 12
MMU
Page Offset
13 12
Page Offset
16 15
Page Offset
16 15
Page Offset
19 18
Page Offset
19 18
Page Offset
22 21
Page Offset
22 21
and FFFF F7FF FFFF FFFF
16
VA
0
8 Kb
PA
0
VA
0
64 Kb
PA
0
VA
0
512 Kb
PA
0
VA
0
4 Mb
PA
0
, inclusive,
16