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Supervisor Mode Space--xksseg
The MIPS architecture permits three modes of operation: user, kernel, and supervisor. When operating in kernel or supervisor mode, the 2 TB space beginning at 0x4000 0000 0000 0000 is accessible. IRIX does not employ the supervisor mode, and does not use xksseg. If xksseg were used, it would be mapped and cached.
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