ia64/linux-2.6.18-xen.hg

view include/xen/gnttab.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 037c44559e55
children d49054ec0cc6
line source
1 /******************************************************************************
2 * gnttab.h
3 *
4 * Two sets of functionality:
5 * 1. Granting foreign access to our memory reservation.
6 * 2. Accessing others' memory reservations via grant references.
7 * (i.e., mechanisms for both sender and recipient of grant references)
8 *
9 * Copyright (c) 2004-2005, K A Fraser
10 * Copyright (c) 2005, Christopher Clark
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License version 2
14 * as published by the Free Software Foundation; or, when distributed
15 * separately from the Linux kernel or incorporated into other
16 * software packages, subject to the following license:
17 *
18 * Permission is hereby granted, free of charge, to any person obtaining a copy
19 * of this source file (the "Software"), to deal in the Software without
20 * restriction, including without limitation the rights to use, copy, modify,
21 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
22 * and to permit persons to whom the Software is furnished to do so, subject to
23 * the following conditions:
24 *
25 * The above copyright notice and this permission notice shall be included in
26 * all copies or substantial portions of the Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
31 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
32 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
33 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
34 * IN THE SOFTWARE.
35 */
37 #ifndef __ASM_GNTTAB_H__
38 #define __ASM_GNTTAB_H__
40 #include <asm/hypervisor.h>
41 #include <asm/maddr.h> /* maddr_t */
42 #include <linux/mm.h>
43 #include <xen/interface/grant_table.h>
44 #include <xen/features.h>
46 struct gnttab_free_callback {
47 struct gnttab_free_callback *next;
48 void (*fn)(void *);
49 void *arg;
50 u16 count;
51 };
53 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
54 int flags);
56 /*
57 * End access through the given grant reference, iff the grant entry is no
58 * longer in use. Return 1 if the grant entry was freed, 0 if it is still in
59 * use.
60 */
61 int gnttab_end_foreign_access_ref(grant_ref_t ref);
63 /*
64 * Eventually end access through the given grant reference, and once that
65 * access has been ended, free the given page too. Access will be ended
66 * immediately iff the grant entry is not in use, otherwise it will happen
67 * some time later. page may be 0, in which case no freeing will occur.
68 */
69 void gnttab_end_foreign_access(grant_ref_t ref, unsigned long page);
71 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
73 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
74 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
76 int gnttab_query_foreign_access(grant_ref_t ref);
78 /*
79 * operations on reserved batches of grant references
80 */
81 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
83 void gnttab_free_grant_reference(grant_ref_t ref);
85 void gnttab_free_grant_references(grant_ref_t head);
87 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
89 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
91 void gnttab_release_grant_reference(grant_ref_t *private_head,
92 grant_ref_t release);
94 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
95 void (*fn)(void *), void *arg, u16 count);
96 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
98 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
99 unsigned long frame, int flags);
101 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
102 unsigned long pfn);
104 int gnttab_copy_grant_page(grant_ref_t ref, struct page **pagep);
105 void __gnttab_dma_map_page(struct page *page);
106 static inline void __gnttab_dma_unmap_page(struct page *page)
107 {
108 }
110 void gnttab_reset_grant_page(struct page *page);
112 int gnttab_suspend(void);
113 int gnttab_resume(void);
115 void *arch_gnttab_alloc_shared(unsigned long *frames);
117 static inline void
118 gnttab_set_map_op(struct gnttab_map_grant_ref *map, maddr_t addr,
119 uint32_t flags, grant_ref_t ref, domid_t domid)
120 {
121 if (flags & GNTMAP_contains_pte)
122 map->host_addr = addr;
123 else if (xen_feature(XENFEAT_auto_translated_physmap))
124 map->host_addr = __pa(addr);
125 else
126 map->host_addr = addr;
128 map->flags = flags;
129 map->ref = ref;
130 map->dom = domid;
131 }
133 static inline void
134 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, maddr_t addr,
135 uint32_t flags, grant_handle_t handle)
136 {
137 if (flags & GNTMAP_contains_pte)
138 unmap->host_addr = addr;
139 else if (xen_feature(XENFEAT_auto_translated_physmap))
140 unmap->host_addr = __pa(addr);
141 else
142 unmap->host_addr = addr;
144 unmap->handle = handle;
145 unmap->dev_bus_addr = 0;
146 }
148 static inline void
149 gnttab_set_replace_op(struct gnttab_unmap_and_replace *unmap, maddr_t addr,
150 maddr_t new_addr, grant_handle_t handle)
151 {
152 if (xen_feature(XENFEAT_auto_translated_physmap)) {
153 unmap->host_addr = __pa(addr);
154 unmap->new_addr = __pa(new_addr);
155 } else {
156 unmap->host_addr = addr;
157 unmap->new_addr = new_addr;
158 }
160 unmap->handle = handle;
161 }
163 #endif /* __ASM_GNTTAB_H__ */