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问题内容:存储段描述符中标号A(accessed)具体含义??
- 原讨论链接:http://community.csdn.net/expert/topicview1.asp?id=5101561
- 所属论坛:汇编语言
审核组:其他开发语言
- 提问者:biansant
解决者:lazyfish
- 感谢:
- 关键字:其他开发语言 汇编语言 堆栈 符 访问 存储 描述 标号 bit 段 segment
- 答案:
在386保护模式中,其中存储段描述符的有个标号A,即accessed
A=1时,表示段尚未被访问;
A=0时,表示段已被访问。
在保护模式的例子中
别的数据段,代码段都没有声明A是0还是1,但为什么堆栈段要声明A=1
StackS Desc <TopOfS-1,StackSeg,,ATDWA,,>
ATDWA 表示 可读写已被访问
狗娘养的中国教材
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The accessed bit indicates whether the segment has been accessed since the last time the operating-
system or executive cleared the bit. The processor sets this bit whenever it loads a segment
selector for the segment into a segment register, assuming that the type of memory that contains
the segment descriptor supports processor writes. The bit remains set until explicitly cleared.
This bit can be used both for virtual memory management and for debugging.
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