arch/ia64/xen/grant-table.c

   1 /******************************************************************************
   2  * arch/ia64/xen/grant-table.c
   3  *
   4  * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/slab.h>
  26 #include <linux/mm.h>
  27
  28 #include <xen/interface/xen.h>
  29 #include <xen/interface/memory.h>
  30 #include <xen/grant_table.h>
  31
  32 #include <asm/xen/hypervisor.h>
  33
  34 /****************************************************************************
  35  * grant table hack
  36  * cmd: GNTTABOP_xxx
  37  */
  38
  39 int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
  40                            unsigned long max_nr_gframes,
  41                            struct grant_entry **__shared)
  42 {
  43         *__shared = __va(frames[0] << PAGE_SHIFT);
  44         return 0;
  45 }
  46
  47 void arch_gnttab_unmap_shared(struct grant_entry *shared,
  48                               unsigned long nr_gframes)
  49 {
  50         /* nothing */
  51 }
  52
  53 static void
  54 gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
  55 {
  56         uint32_t flags;
  57
  58         flags = uop->flags;
  59
  60         if (flags & GNTMAP_host_map) {
  61                 if (flags & GNTMAP_application_map) {
  62                         printk(KERN_DEBUG
  63                                "GNTMAP_application_map is not supported yet: "
  64                                "flags 0x%x\n", flags);
  65                         BUG();
  66                 }
  67                 if (flags & GNTMAP_contains_pte) {
  68                         printk(KERN_DEBUG
  69                                "GNTMAP_contains_pte is not supported yet: "
  70                                "flags 0x%x\n", flags);
  71                         BUG();
  72                 }
  73         } else if (flags & GNTMAP_device_map) {
  74                 printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
  75                 BUG();  /* not yet. actually this flag is not used. */
  76         } else {
  77                 BUG();
  78         }
  79 }
  80
  81 int
  82 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
  83 {
  84         if (cmd == GNTTABOP_map_grant_ref) {
  85                 unsigned int i;
  86                 for (i = 0; i < count; i++) {
  87                         gnttab_map_grant_ref_pre(
  88                                 (struct gnttab_map_grant_ref *)uop + i);
  89                 }
  90         }
  91         return xencomm_hypercall_grant_table_op(cmd, uop, count);
  92 }
  93
  94 EXPORT_SYMBOL(HYPERVISOR_grant_table_op);