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xen: add variable hypercall caller

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Allow non-constant hypercall to be called, for privcmd.

[ Impact: make arbitrary hypercalls; needed for privcmd ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-09 12:05:49 -08:00 committed by Jeremy Fitzhardinge
parent eba3ff8b99
commit 1246ae0bb9
1 changed files with 17 additions and 0 deletions
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17
arch/x86/include/asm/xen/hypercall.h
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@ -200,6 +200,23 @@ extern struct { char _entry[32]; } hypercall_page[];
(type)__res; \ (type)__res; \
}) })
static inline long
privcmd_call(unsigned call,
unsigned long a1, unsigned long a2,
unsigned long a3, unsigned long a4,
unsigned long a5)
{
__HYPERCALL_DECLS;
__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
asm volatile("call *%[call]"
: __HYPERCALL_5PARAM
: [call] "a" (&hypercall_page[call])
: __HYPERCALL_CLOBBER5);
return (long)__res;
}
static inline int static inline int
HYPERVISOR_set_trap_table(struct trap_info *table) HYPERVISOR_set_trap_table(struct trap_info *table)
{ {