arm: Implement arch_get_xen_caps

TBD: correct arch name for this string. Should be "xen-" / "hvm-" or something
else given the hybrid model we are using on ARM?

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Ian Campbell <Ian.Campbell@citrix.com>

xen/arch/arm/dummy.S

@@ -9,7 +9,6 @@ x:	mov pc, lr
 DUMMY(alloc_pirq_struct);
 DUMMY(alloc_vcpu_guest_context);
 DUMMY(arch_get_info_guest);
-DUMMY(arch_get_xen_caps);
 DUMMY(arch_set_info_guest);
 DUMMY(arch_vcpu_reset);
 DUMMY(create_grant_host_mapping);

xen/arch/arm/mm.c

@@ -24,6 +24,7 @@
 #include <xen/init.h>
 #include <xen/mm.h>
 #include <xen/preempt.h>
+#include <xen/errno.h>
 #include <asm/page.h>
 #include <asm/current.h>
 

xen/arch/arm/setup.c

@@ -271,6 +271,18 @@ void __init start_xen(unsigned long boot_phys_offset,
     reset_stack_and_jump(init_done);
 }
 
+void arch_get_xen_caps(xen_capabilities_info_t *info)
+{
+    /* Interface name is always xen-3.0-* for Xen-3.x. */
+    int major = 3, minor = 0;
+    char s[32];
+
+    (*info)[0] = '\0';
+
+    snprintf(s, sizeof(s), "xen-%d.%d-armv7l ", major, minor);
+    safe_strcat(*info, s);
+}
+
 /*
  * Local variables:
  * mode: C