blob: 627055bf0bf1e0359fa086be1a64474f9698a67c (
plain)
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
73
74
75
76
77
78
|
/******************************************************************************
* block.h
*
* Block IO communication rings.
*
* These are the ring data structures for buffering messages between
* the hypervisor and guestos's.
*
*/
#ifndef __BLOCK_H__
#define __BLOCK_H__
#include <linux/kdev_t.h>
/* the first four definitions match fs.h */
#define XEN_BLOCK_READ 0
#define XEN_BLOCK_WRITE 1
#define XEN_BLOCK_READA 2 /* currently unused */
#define XEN_BLOCK_SPECIAL 4 /* currently unused */
#define XEN_BLOCK_PROBE 8 /* determine io configuration from hypervisor */
#define XEN_BLOCK_DEBUG 16 /* debug */
#define BLK_RING_SIZE 128
#define BLK_RING_MAX_ENTRIES (BLK_RING_SIZE - 2)
#define BLK_RING_INC(_i) (((_i)+1) & (BLK_RING_SIZE-1))
#define BLK_RING_ADD(_i,_j) (((_i)+(_j)) & (BLK_RING_SIZE-1))
typedef struct blk_ring_req_entry
{
void * id; /* for guest os use */
int operation; /* XEN_BLOCK_READ or XEN_BLOCK_WRITE */
char * buffer;
unsigned long block_number; /* block number */
unsigned short block_size; /* block size */
kdev_t device;
unsigned long sector_number; /* real buffer location on disk */
} blk_ring_req_entry_t;
typedef struct blk_ring_resp_entry
{
void *id;
unsigned long status;
} blk_ring_resp_entry_t;
typedef struct blk_ring_st
{
unsigned int req_prod; /* Request producer. Updated by guest OS. */
unsigned int resp_prod; /* Response producer. Updated by Xen. */
union {
blk_ring_req_entry_t req;
blk_ring_resp_entry_t resp;
} ring[BLK_RING_SIZE];
} blk_ring_t;
#define MAX_XEN_DISK_COUNT 100
#define XEN_DISK_IDE 1
#define XEN_DISK_SCSI 2
typedef struct xen_disk /* physical disk */
{
int type; /* disk type */
unsigned long capacity;
unsigned char heads; /* hdreg.h::hd_geometry */
unsigned char sectors; /* hdreg.h::hd_geometry */
unsigned int cylinders; /* hdreg.h::hd_big_geometry */
unsigned long start; /* hdreg.h::hd_geometry */
void * gendisk; /* struct gendisk ptr */
} xen_disk_t;
typedef struct xen_disk_info
{
int count; /* number of subsequent xen_disk_t structures to follow */
xen_disk_t disks[100];
} xen_disk_info_t;
#endif
|
