公开(公告)号：US4035779A

公开(公告)日：1977-07-12

申请号：US681985

申请日：1976-04-30

申请人： Richard Eugene Birney ,  Michael Ian Davis ,  Robert Allen Hood ,  Thomas Stephen McDermott ,  Larry Edward Wise

发明人： Richard Eugene Birney ,  Michael Ian Davis ,  Robert Allen Hood ,  Thomas Stephen McDermott ,  Larry Edward Wise

IPC分类号： G06F12/06 ,  G06F12/14 ,  G06F13/00

CPC分类号： G06F12/1458

摘要： System mode controls for obtaining limited addressability for supervisor programming operations without disturbing a user address key currently contained in a user key register (UKR).The mode controls are provided by bits in a system register called a level status register (LSR), which include an APM bit, and a supervisor state bit. The largest supervisor addressability is obtained when both the APM and supervisor state bits are set on, which permits execution of a supervisor program which can access user data and programs. In more detail, each instruction fetch must be in the supervisor key area, identified by a predetermined supervisor key value which is not in the UKR, while each operand of the fetched supervisor instruction is accessed in the user key area identified by the current key in the UKR. The supervisor is not permitted to access any user area which does not have its key in the UKR. Thus, the supervisor can be prevented from having addressability over part or all of the main memory.However, if the APM bit is off while the supervisor bit is on, all instruction and operand storage accesses can only be made in the supervisor key area, regardless of whether the supervisor key or user key is in the UKR. Hence no user area is accessible to the supervisor.But, if the supervisor bit is off, all instruction and operand accesses can only be made in the user area of the key in the UKR. Hence the supervisor programs cannot execute.

摘要翻译： 系统模式控制，用于在不干扰当前包含在用户密钥寄存器（UKR）中的用户地址密钥的情况下获得用于管理程序编程操作的有限寻址能力。

公开(公告)号：US4041462A

公开(公告)日：1977-08-09

申请号：US682002

申请日：1976-04-30

申请人： Michael Ian Davis ,  Gary Wayne Mayes ,  Thomas Stephen McDermott ,  Larry Edward Wise

发明人： Michael Ian Davis ,  Gary Wayne Mayes ,  Thomas Stephen McDermott ,  Larry Edward Wise

IPC分类号： G06F9/40 ,  G06F9/42 ,  G06F9/18

CPC分类号： G06F9/4426 ,  G06F9/4425

摘要： A data processing system is described wherein, during linkage to a subroutine, by a single machine instruction, a complete status save and the assignment of a dynamic work area are effected. By another single machine instruction the process is reversed. The elements of the complete machine status and the dynamic work area are retained in a hardware controlled stack, thus permitting nesting of the subroutine calls.

摘要翻译： 描述了一种数据处理系统，其中在通过单个机器指令连接到子程序期间，实现完整的状态保存和动态工作区的分配。 通过另一个单机指令，该过程相反。 完整的机器状态和动态工作区域的元素保留在硬件控制的堆栈中，从而允许嵌套子程序调用。