hw/xen_backend.h

   1 #ifndef QEMU_HW_XEN_BACKEND_H
   2 #define QEMU_HW_XEN_BACKEND_H 1
   3
   4 #include "xen_common.h"
   5
   6 /* ------------------------------------------------------------- */
   7
   8 #define XEN_BUFSIZE 1024
   9
  10 struct XenDevice;
  11
  12 /* driver uses grant tables  ->  open gntdev device (xendev->gnttabdev) */
  13 #define DEVOPS_FLAG_NEED_GNTDEV   1
  14 /* don't expect frontend doing correct state transitions (aka console quirk) */
  15 #define DEVOPS_FLAG_IGNORE_STATE  2
  16
  17 struct XenDevOps {
  18     size_t    size;
  19     uint32_t  flags;
  20     void      (*alloc)(struct XenDevice *xendev);
  21     int       (*init)(struct XenDevice *xendev);
  22     int       (*connect)(struct XenDevice *xendev);
  23     void      (*event)(struct XenDevice *xendev);
  24     void      (*disconnect)(struct XenDevice *xendev);
  25     int       (*free)(struct XenDevice *xendev);
  26     void      (*backend_changed)(struct XenDevice *xendev, const char *node);
  27     void      (*frontend_changed)(struct XenDevice *xendev, const char *node);
  28 };
  29
  30 struct XenDevice {
  31     const char         *type;
  32     int                dom;
  33     int                dev;
  34     char               name[64];
  35     int                debug;
  36
  37     enum xenbus_state  be_state;
  38     enum xenbus_state  fe_state;
  39     int                online;
  40     char               be[XEN_BUFSIZE];
  41     char               *fe;
  42     char               *protocol;
  43     int                remote_port;
  44     int                local_port;
  45
  46     int                evtchndev;
  47     int                gnttabdev;
  48
  49     struct XenDevOps   *ops;
  50     TAILQ_ENTRY(XenDevice) next;
  51 };
  52
  53 /* ------------------------------------------------------------- */
  54
  55 /* variables */
  56 extern int xen_xc;
  57 extern struct xs_handle *xenstore;
  58
  59 /* xenstore helper functions */
  60 int xenstore_write_str(const char *base, const char *node, const char *val);
  61 int xenstore_write_int(const char *base, const char *node, int ival);
  62 char *xenstore_read_str(const char *base, const char *node);
  63 int xenstore_read_int(const char *base, const char *node, int *ival);
  64
  65 int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val);
  66 int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival);
  67 char *xenstore_read_be_str(struct XenDevice *xendev, const char *node);
  68 int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival);
  69 char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node);
  70 int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival);
  71
  72 const char *xenbus_strstate(enum xenbus_state state);
  73 struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev);
  74 void xen_be_check_state(struct XenDevice *xendev);
  75
  76 /* xen backend driver bits */
  77 int xen_be_init(void);
  78 int xen_be_register(const char *type, struct XenDevOps *ops);
  79 int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state);
  80 int xen_be_bind_evtchn(struct XenDevice *xendev);
  81 void xen_be_unbind_evtchn(struct XenDevice *xendev);
  82 int xen_be_send_notify(struct XenDevice *xendev);
  83 void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...)
  84     __attribute__ ((format(printf, 3, 4)));
  85
  86 #endif /* QEMU_HW_XEN_BACKEND_H */