知搜-全球专利检索

  1. 登录
  2. 注册
发明授权
CN1497432B 微处理器标记寄存器屏蔽移入弹出装置和方法 有权

微处理器标记寄存器屏蔽移入弹出装置和方法
摘要：
一种写入到微处理器内EFLAGS寄存器或从该寄存器读出的方法和装置。对于特定写入到EFLAGS请求，采用写入操作目标信息和写入操作优先级信息生成一屏蔽。随后，该屏蔽与EFLAGS的新值信息进行逻辑乘的操作，所得结果在单个指令周期内写入到EFLAGS寄存器。对于特定从EFLAGS读出请求，采用根据当前优先级信息读取操作过程中与更新多位标记寄存器那些字节有关的优先级信息生成一屏蔽。随后，该屏蔽与EFLAGS寄存器内容进行逻辑乘的操作，所得结果存储到存储器堆栈内。
摘要（英）：

A method and apparatus are provided for writing to, and reading from, the EFLAGS register in a processor. For a particular write to EFLAGS request, a mask is generated using destination information for the write and privilege level information for the write. The mask is then ANDed with EFLAGS new value information and the result is written to the EFLAGS register in a single instruction cycle. Fora particular read from EGLAGS request, a mask is generated using privilege information for the read to specify those bits of EFLAGS which can be updated during the read. The mask is then ANDed with the contents of the EFLAGS register and the result is stored in a stack in memory.

公开/授权文献
0/0