TMPR4956C datasheet(102/286 Pages) TOSHIBA

102 / 286 page

Chapter 4 Memory Management System

4-8

Table 4.2.2 32-bit and 64-bit Supervisor Mode Segments

Status Register

Bit Values

Address Bit

Values

KSU

EXL

ERL

Segment

Name

Address Range

Segment Size

32-bit

A[31] = 0

012

suseg

0x0000 0000

through

0x7FFF FFFF

2 Gbytes

31 bytes)

32-bit

A[31:29] = 1102

012

ssseg

0xC000 0000

through

0xDFFF FFFF

512 Mbytes

29 bytes)

64-bit

A[63:62] = 002

012

xsuseg

0x0000 0000 0000 0000

through

0x0000 00FF FFFF FFFF

1 Tbytes

40 bytes)

64-bit

A[63:62] = 012

012

xsseg

0x4000 0000 0000 0000

through

0x4000 00FF FFFF FFFF

1 Tbytes

40 bytes)

64-bit

A[63:62] = 112

012

csseg

0xFFFF FFFF C000 0000

through

0xFFFF FFFF DFFF FFFF

512 Mbytes

29 bytes)

32-bit Supervisor Mode, User Space (suseg)

In Supervisor mode, when SX = 0 in the Status register and the most-significant bit of the 32-bit virtual

address is set to 0, the suseg virtual address space is selected; it covers the full 2

31 bytes (2 Gbytes) of 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. This mapped space starts at virtual address 0x0000 0000 and runs through

0x7FFF FFFF.

32-bit Supervisor Mode, Supervisor Space (sseg)

In Supervisor mode, when SX = 0 in the Status register and the three most-significant bits of the 32-bit

virtual address are 1102, the sseg virtual address space is selected; it covers 2

29 bytes (512 Mbytes) of the

current supervisor address space. The virtual address is extended with the contents of the 8-bit ASID field

to form a unique virtual address. This mapped space begins at virtual address 0xC000 0000 and runs

through 0xDFFF FFFF.

64-bit Supervisor Mode, User Space (xsuseg)

In Supervisor mode, when SX = 1 in the Status register and bits 63-62 of the virtual address are set to

002, the xsuseg virtual address space is selected; it covers the full 2

40 bytes (1 Tbytes) of 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. This mapped space starts at virtual address 0x0000 0000 0000 0000 and runs through

0x0000 00FF FFFF FFFF.

64-bit Supervisor Mode, Current Supervisor Space (xsseg)

In Supervisor mode, when SX = 1 in the Status register and bits 63-62 of the virtual address are set to

012, the xsseg current supervisor virtual address space is selected. The virtual address is extended with the

contents of the 8-bit ASID field to form a unique virtual address. This mapped space begins at virtual

address 0x4000 0000 0000 0000 and runs through 0x4000 00FF FFFF FFFF.

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