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[Xen-devel] GET_CURRENT macro in entry.S

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>
  • From: "pallavi jk" <pallutai@xxxxxxxxx>
  • Date: Mon, 29 Dec 2008 22:15:13 +0530
  • Cc:
  • Delivery-date: Mon, 29 Dec 2008 08:45:37 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
I am unable to understand what this macro in  entry.S does. Can someone please explain its working?
 
#define GET_CURRENT(reg)         \
        movl $STACK_SIZE-4, reg; \
        orl  %esp, reg;          \
        andl $~3,reg;            \
        movl (reg),reg;

Also, how does the address of "struct vcpu" come in %ebx ? How do I obtain it?

Please help.

-Pallavi 
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