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参数资料
| 型号： | RM7965A-900UI |
| 厂商： | PMC-SIERRA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 64-BIT, 900 MHz, MICROPROCESSOR, PBGA256 |
| 封装： | 27 X 27 MM, 1.62 MM HEIGHT, MO-192BAL-2, CSBGA-256 |
| 文件页数： | 17/60页 |
| 文件大小： | 508K |
| 代理商： | RM7965A-900UI |
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RM7965A-900UI 900 MHz 64-bit Microprocessor Data Sheet
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
24
Document No.: PMC-2100294, Issue 2
4.15 Virtual to Physical Address Mapping
The E9000 provides three modes of virtual addressing:
user mode
kernel mode
supervisor mode
These modes allow system software to provide a secure environment for user processes. Bits in
the CP0 Status register determine which virtual addressing mode is used. In user mode, the
E9000 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, totaling 1024 GB
(4 GB in 32-bit mode), are simultaneously available and are differentiated by the high-order bits
of the virtual address.
The E9000 core 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 shows the address space layout for 32-bit operations.
Table 7 Kernel Mode Virtual Addressing (32-bit)
0xFFFFFFFF
0xE0000000
Kernel virtual address space
(kseg3)
Mapped, 0.5GB
0xDFFFFFFF
0xC0000000
Supervisor virtual address space
(ksseg)
Mapped, 0.5GB
0xBFFFFFFF
0xA0000000
Uncached kernel physical address space
(kseg1)
Unmapped, 0.5GB
0x9FFFFFFF
0x80000000
Cached kernel physical address space
(kseg0)
Unmapped, 0.5GB
0x7FFFFFFF
0x00000000
User virtual address space
(kuseg)
Mapped, 2.0GB
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