xen: add variable hypercall caller
authorJeremy Fitzhardinge <jeremy@goop.org>
Mon, 9 Feb 2009 20:05:49 +0000 (12:05 -0800)
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Wed, 20 Oct 2010 23:22:27 +0000 (16:22 -0700)
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>
arch/x86/include/asm/xen/hypercall.h

index 7fda040..a3c28ae 100644 (file)
@@ -200,6 +200,23 @@ extern struct { char _entry[32]; } hypercall_page[];
        (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
 HYPERVISOR_set_trap_table(struct trap_info *table)
 {