| 摘要 |
PURPOSE:To attain system call with no consciousness of a logical space address by referring to a logical space number register to control the transfer of a parameter in a system call mode. CONSTITUTION:A system call interruption vector 1 serves as a register which sets an entry address of the routine to which the control is shifted when a system call interruption is produced. Thus the address of a user interruption processing routine 6 is set in a user state mode; while the address of a system interruption processing routine 7 is set in a system state mode respectively. At the same time, a logical space number register 2 stores whether the system call which is under execution is called out of a logical space or not.
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