https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Ring-0-CPU-0-3-Stack-segment/m-p/824031#M1334 Each hardware thread would require a seperate stack.<BR /><BR />Note, the seperate stacks can be seperate areas within the same selector (with different esp/rsp) or within different selectors. This is an operating system design issue.<BR /><BR />Jim Dempsey<BR /> Thu, 20 Jan 2011 23:40:03 GMT jimdempseyatthecove 2011-01-20T23:40:03Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Ring-0-CPU-0-3-Stack-segment/m-p/824030#M1333 <P>Hi all,</P><P>When CPU switches from Ring-3 to Ring-0, SS is also switched to Ring-0 stack. In a multi-processor environment, if there are N number of CPU's, does each CPU will have it's own Ring-0 stack?</P><P>Regards</P><P>Gupta</P> Thu, 13 Jan 2011 23:18:49 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Ring-0-CPU-0-3-Stack-segment/m-p/824030#M1333 mguptamel 2011-01-13T23:18:49Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Ring-0-CPU-0-3-Stack-segment/m-p/824031#M1334 Each hardware thread would require a seperate stack.<BR /><BR />Note, the seperate stacks can be seperate areas within the same selector (with different esp/rsp) or within different selectors. This is an operating system design issue.<BR /><BR />Jim Dempsey<BR /> Thu, 20 Jan 2011 23:40:03 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/Ring-0-CPU-0-3-Stack-segment/m-p/824031#M1334 jimdempseyatthecove 2011-01-20T23:40:03Z