TMPR4956C datasheet(107/286 Pages) TOSHIBA

107 / 286 page

Chapter 4 Memory Management System

4-13

32-bit Kernel Mode, Kernel Space 3 (kseg3)

In Kernel mode, when KX = 0 in the Status register and the most-significant three bits of the 32-bit vital

address are 1112, the kseg3 virtual address space is selected; it is the current 2

29 bytes (512 Mbytes-4

Mbytes) kernel virtual space. The virtual address is extended with the contents of the 8-bit ASID field to

form a unique virtual address.

Table 4.2.4 64-bit Kernel Mode Segments

Status Register

Is One Of These Values

Address

Bit Values

KSU

EXL

ERL

Segment

Name

Address Range

Segment Size

A[63:62] = 002

xkuseg

0x0000 0000 0000 0000

through

0x0000 00FF FFFF FFFF

1 Tbytes

40 bytes)

A[63:62] = 012

xksseg

0x4000 0000 0000 0000

through

0x4000 00FF FFFF FFFF

1 Tbytes

40 bytes)

A[63:62] = 102

xkphys

0x8000 0000 0000 0000

through

0xBFFF FFFF FFFF FFFF

× 232 bytes

A[63:62] = 112

xkseg

0xC000 0000 0000 0000

through

0xC000 00FF 7FFF FFFF

40 –231 bytes

A[63:62] = 112

A[61:31] = -1

ckseg0

0xFFFF FFFF 8000 0000

through

0xFFFF FFFF 9FFF FFFF

512 Mbytes

29 bytes)

A[63:62] = 112

A[61:31] = -1

ckseg1

0xFFFF FFFF A000 0000

through

0xFFFF FFFF BFFF FFFF

512 Mbytes

29 bytes)

A[63:62] = 112

A[61:31] = -1

cksseg

0xFFFF FFFF C000 0000

through

0xFFFF FFFF DFFF FFFF

512 Mbytes

29 bytes)

ckseg3

0xFFFF FFFF E000 0000

through

0xFFFF FFFF FFFF FFFF

512 Mbytes

-4 Mbyte

A[63:62] = 112

A[61:31] = -1

KSU = 002

EXL = 1

ERL = 1

Reserved

(Note)

0xFFFF FFFF FF00 0000

through

0xFFFF FFFF FF3F FFFF

4 Mbytes

Note : 0xffff_ffff_ff00_0000 through 0xffff_ffff_ff3f_ffff in 64-bit mode is reserved (unmapped, uncached) for

use by registers in the Debug Support Unit and the processor’s peripherals.

64-bit Kernel Mode, User Space (xkuseg)

In Kernel mode, when KX = 1 in the Status register and bits 63-62 of the 64-bit virtual address are 002,

the xkuseg virtual address space is selected; it covers the current user address space. The virtual address is

extended with the contents of the 8-bit ASID field to form a unique virtual address.

When ERL = 1 in the Status register, the user address region becomes a 2

31 bytes unmapped (that is,

mapped directly to physical addresses) uncached address space.

64-bit Kernel Mode, Current Supervisor Space (xksseg)

In Kernel mode, when KX = 1 in the Status register and bits 63-62 of the 64-bit virtual address are 012,

the xksseg virtual address space is selected; it is the current supervisor virtual space. The virtual address is

extended with the contents of the 8-bit ASID field to form a unique virtual address.

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