xen: make grant table arch portable

split out x86 specific part from grant-table.c and
allow ia64/xen specific initialization.
ia64/xen grant table is based on pseudo physical address
(guest physical address) unlike x86/xen. On ia64 init_mm
doesn't map identity straight mapped area.
ia64/xen specific grant table initialization is necessary.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index d2822920d43e..466204846121 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -103,6 +103,12 @@ void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
                                        unsigned long pfn);
 
+int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
+                           unsigned long max_nr_gframes,
+                           struct grant_entry **__shared);
+void arch_gnttab_unmap_shared(struct grant_entry *shared,
+                              unsigned long nr_gframes);
+
 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
 
 #endif /* __ASM_GNTTAB_H__ */