Cacheability And Xkphys Address Space - NEC uPD98502 User Manual

(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.
(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.
Bits 61-59
0
1
2
3
4
5
6
7
114
CHAPTER 2 V
40
bytes) current supervisor address space. The virtual address is extended
Table 2-31. Cacheability and xkphys Address Space
Cacheability
Cached
Cached
Uncached
Cached
Cached
Cached
Cached
Cached
Preliminary User's Manual S15543EJ1V0UM
4120A
R
Start Address
8000_0000_0000_0000H
to
8000_0000_FFFF_FFFFH
8800_0000_0000_0000H
to
8800_0000_FFFF_FFFFH
9000_0000_0000_0000H
to
9000_0000_FFFF_FFFFH
9800_0000_0000_0000H
to
9800_0000_FFFF_FFFFH
A000_0000_0000_0000H
to
A000_0000_FFFF_FFFFH
A800_0000_0000_0000H
to
A800_0000_FFFF_FFFFH
B000_0000_0000_0000H
to
B000_0000_FFFF_FFFFH
B800_0000_0000_0000H
to
B800_0000_FFFF_FFFFH