1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/******************************************************************************
* gnttab.h
*
* Two sets of functionality:
* 1. Granting foreign access to our memory reservation.
* 2. Accessing others' memory reservations via grant references.
* (i.e., mechanisms for both sender and recipient of grant references)
*
* Copyright (c) 2004, K A Fraser
* Copyright (c) 2005, Christopher Clark
*/
#ifndef __ASM_GNTTAB_H__
#define __ASM_GNTTAB_H__
#include <linux/config.h>
#include <asm-xen/hypervisor.h>
#include <asm-xen/xen-public/grant_table.h>
/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
#define NR_GRANT_FRAMES 4
#define NR_GRANT_ENTRIES (NR_GRANT_FRAMES * PAGE_SIZE / sizeof(grant_entry_t))
int
gnttab_grant_foreign_access(
domid_t domid, unsigned long frame, int readonly);
void
gnttab_end_foreign_access(
grant_ref_t ref, int readonly);
int
gnttab_grant_foreign_transfer(
domid_t domid, unsigned long pfn);
unsigned long
gnttab_end_foreign_transfer(
grant_ref_t ref);
int
gnttab_query_foreign_access(
grant_ref_t ref );
/*
* operations on reserved batches of grant references
*/
int
gnttab_alloc_grant_references(
u16 count, grant_ref_t *pprivate_head, grant_ref_t *private_terminal );
void
gnttab_free_grant_references(
u16 count, grant_ref_t private_head );
int
gnttab_claim_grant_reference( grant_ref_t *pprivate_head, grant_ref_t terminal
);
void
gnttab_release_grant_reference(
grant_ref_t *private_head, grant_ref_t release );
void
gnttab_grant_foreign_access_ref(
grant_ref_t ref, domid_t domid, unsigned long frame, int readonly);
void
gnttab_grant_foreign_transfer_ref(
grant_ref_t, domid_t domid, unsigned long pfn);
#endif /* __ASM_GNTTAB_H__ */
|
