[Xen-devel] hypercall_page

["T S" <thileepan_@xxxxxxxxxxx>]

Hi,

Can someone let me know what exactly the array "hypercall_page " contains? 
Are they function pointers?
How do I know which functions are going to be called when a HYPERVISOR_xxx 
is called?
For instance, when the following asm code is to be executed:

define _hypercall3(type, sched_op, a1, a2, a3)                     \
({                                                              \
       long __res, __ign1, __ign2, __ign3;                     \
       asm volatile (                                          \
               "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"\
               : "=a" (__res), "=b" (__ign1), "=c" (__ign2),   \
               "=d" (__ign3)                                   \
               : "1" ((long)(a1)), "2" ((long)(a2)),           \
               "3" ((long)(a3))                                \
               : "memory" );                                   \
       (type)__res;                                            \
})

The #define for __HYPERVISOR_sched_op is 6

how do I find out which subroutine is the "call" going to call?

The above asm code is present in /arch/xen/kernel/hypercall.h

thanks !

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