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
39int 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
47void arch_gnttab_unmap_shared(struct grant_entry *shared,
48			      unsigned long nr_gframes)
49{
50	/* nothing */
51}
52
53static void
54gnttab_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
81int
82HYPERVISOR_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
94EXPORT_SYMBOL(HYPERVISOR_grant_table_op);
95