參數(shù)資料
型號(hào)： RM7000-225S
廠商： PMC-Sierra, Inc.
英文描述： RM7000⑩ Microprocessor with On-Chip Secondary Cache Datasheet Released
中文描述： RM7000⑩微處理器與片上二級(jí)高速緩存數(shù)據(jù)發(fā)布
文件頁(yè)數(shù)： 19/54頁(yè)
文件大?。?/td> 901K
代理商： RM7000-225S
Proprietary and Confidential to PMC-Sierra, Inc and for its Customer
’
s Internal Use
Document ID: PMC-2002175, Issue 1
19
RM7000
Microprocessor with On-Chip Secondary Cache Datasheet
Released
4.12 Virtual to Physical Address Mapping
The RM7000 provides three modes of virtual addressing:
user mode
supervisor mode
kernel mode
This mechanism is available to system software to provide a secure environment for user
processes. Bits in the CP0 Status register determine which virtual addressing mode is used. In the
user mode, the RM7000 provides a single, uniform virtual address space of 256 GB (2 GB in 32-
bit mode).
When operating in the kernel mode, four distinct virtual address spaces, totalling 1024 GB (4 GB
in 32-bit mode), are simultaneously available and are differentiated by the high-order bits of the
virtual address.
The RM7000 processor also supports a supervisor mode in which the virtual address space is
256.5 GB (2.5 GB in 32-bit mode), divided into three regions based on the high-order bits of the
virtual address. Figure 6 shows the address space layout for 32-bit operation.
Figure 6 Kernel Mode Virtual Addressing (32-bit mode)
When the RM7000 is configured for 64-bit addressing, the virtual address space layout is an
upward compatible extension of the 32-bit virtual address space layout.
0xFFFFFFFF
Kernel virtual address space
(kseg3)
Mapped, 0.5GB
0xE0000000
0xDFFFFFFF
Supervisor virtual address space
(ksseg)
Mapped, 0.5GB
0xC0000000
0xBFFFFFFF
Uncached kernel physical address space
(kseg1)
Unmapped, 0.5GB
0xA0000000
0x9FFFFFFF
Cached kernel physical address space
(kseg0)
Unmapped, 0.5GB
0x80000000
0x7FFFFFFF
User virtual address space
(kuseg)
Mapped, 2.0GB
相關(guān)PDF資料
PDF描述
RM7000-250S RM7000⑩ Microprocessor with On-Chip Secondary Cache Datasheet Released
RM7000-250T RM7000⑩ Microprocessor with On-Chip Secondary Cache Datasheet Released
RM7000-263S RM7000⑩ Microprocessor with On-Chip Secondary Cache Datasheet Released
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RM7000-250S 制造商:QED 功能描述:Microprocessor, 64 Bit, 304 Pin, Plastic, BGA
RM7000263S 制造商:QED 功能描述:*
RM7000-263S 制造商:QED 功能描述:Microprocessor, 64 Bit, 304 Pin, Plastic, BGA 制造商:Quantum Effect Design 功能描述:Microprocessor, 64 Bit, 304 Pin, Plastic, BGA
RM7000-266T 制造商:QED 功能描述:Microprocessor, 64 Bit, 304 Pin, Plastic, BGA
RM7000-300T 制造商:QED 功能描述: 制造商:QED 功能描述:Microprocessor, 64 Bit, 304 Pin, Plastic, BGA
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