Hypercall_page is actually a code page, which contains 32 hypercall entry. every
entry is something like
"mov $__HYPERVISOR_xxx,%eax
int $0x82 "
It is initialized in hypercall_page_initialise(void *hypercall_page) at the time
when control panel creates the domain. Later, domain can simply the
corresponding entry to issue a hypercall.
For the subroutine of the HYPERVISOR_xxx, usually it is do_xxx. For example,
__HYPERVISOR_sched_op should be do_sched_op. For more information, please refer
to hypercall_table in xen/arch/x86/x86_{32,64}/entry.S.
Thanks
Ke
T S wrote:> 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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