MAJOR=4 MINOR=60 DEVNAME=tty60 ˆ¾Æ 0ÀÄ ˆÁÆ ƒyà¿ÀÄ"`/****************************************************************************** * xenbus.h * * Talks to Xen Store to figure out what devices we have. * * Copyright (C) 2005 Rusty Russell, IBM Corporation * Copyright (C) 2005 XenSource Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #ifndef _XEN_XENBUS_H #define _XEN_XENBUS_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define XENBUS_MAX_RING_GRANT_ORDER 4 #define XENBUS_MAX_RING_GRANTS (1U << XENBUS_MAX_RING_GRANT_ORDER) /* Register callback to watch this node. */ struct xenbus_watch { struct list_head list; /* Path being watched. */ const char *node; unsigned int nr_pending; /* * Called just before enqueing new event while a spinlock is held. * The event will be discarded if this callback returns false. */ bool (*will_handle)(struct xenbus_watch *, const char *path, const char *token); /* Callback (executed in a process context with no locks held). */ void (*callback)(struct xenbus_watch *, const char *path, const char *token); }; /* A xenbus device. */ struct xenbus_device { const char *devicetype; const char *nodename; const char *otherend; int otherend_id; struct xenbus_watch otherend_watch; struct device dev; enum xenbus_state state; struct completion down; struct work_struct work; struct semaphore reclaim_sem; /* Event channel based statistics and settings. */ atomic_t event_channels; atomic_t events; atomic_t spurious_events; atomic_t jiffies_eoi_delayed; unsigned int spurious_threshold; }; #define to_xenbus_device(__dev) container_of_const(__dev, struct xenbus_device, dev) struct xenbus_device_id { /* .../device// */ char devicetype[32]; /* General class of device. */ }; /* A xenbus driver. */ struct xenbus_driver { const char *name; /* defaults to ids[0].devicetype */ const struct xenbus_device_id *ids; bool allow_rebind; /* avoid setting xenstore closed during remove */ bool not_essential; /* is not mandatory for boot progress */ int (*probe)(struct xenbus_device *dev, const struct xenbus_device_id *id); void (*otherend_changed)(struct xenbus_device *dev, enum xenbus_state backend_state); void (*remove)(struct xenbus_device *dev); int (*suspend)(struct xenbus_device *dev); int (*res