What is the meaning of GET_CURRENT in system call ??

[hushui]

Hi,everybody,
in entry.S there are many definations about sysytem calls
I want to know some about GET_CURRENT which is used as GET_CURRENT(%ebx)  .
the defination of it is following 
 
      #define GET_CURRENT(reg) \
        movl %esp, reg; \
        andl $-8192, reg;
 
put the value of reg to esp then   andl $-8192, reg;
What is this means???
Thank you 


            hushui
          



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