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CHAPTER 2 V
R
4120A
Preliminary User’s Manual S14767EJ1V0UM00
143
(7) xksseg (64-bit kernel mode, current supervisor space)
When KX = 1 in the Status register and bits 63 and 62 of the virtual address space are 01, the xksseg address
space is selected; it is the 1-Tbyte (2
with the contents of the 8-bit ASID field to form a unique virtual address.
40
bytes)current supervisor address space. The virtual address is extended
(8) xkphys (64-bit kernel mode, physical spaces)
When the KX = 1 in the Status register and bits 63 and 62 of the virtual address space are 10, the virtual address
space is called xkphys and selected as either cached or uncached. If any of bits 58 to 32 of the address is 1, an
attempt to access that address results in an address error.
Table 2-52. Cacheability and xkphys Address Space
Bits 61-59
Cacheability
Start Address
0
Cached
0x8000 0000 0000 0000
to
0x8000 0000 FFFF FFFF
1
Cached
0x8800 0000 0000 0000
to
0x8800 0000 FFFF FFFF
2
Uncached
0x9000 0000 0000 0000
to
0x9000 0000 FFFF FFFF
3
Cached
0x9800 0000 0000 0000
to
0x9800 0000 FFFF FFFF
4
Cached
0xA000 0000 0000 0000
to
0xA000 0000 FFFF FFFF
5
Cached
0xA800 0000 0000 0000
to
0xA800 0000 FFFF FFFF
6
Cached
0xB000 0000 0000 0000
to
0xB000 0000 FFFF FFFF
7
Cached
0xB800 0000 0000 0000
to
0xB800 0000 FFFF FFFF