1 /* 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Id$ 30 */ 31 32 #ifndef _SYS_RMAN_H_ 33 #define _SYS_RMAN_H_ 1 34 35 #ifndef KERNEL 36 #include <sys/queue.h> 37 #endif /* !KERNEL */ 38 39 /* 40 * We use a linked list rather than a bitmap because we need to be able to 41 * represent potentially huge objects (like all of a processor's physical 42 * address space). That is also why the indices are defined to have type 43 * `unsigned long' -- that being the largest integral type in Standard C. 44 */ 45 CIRCLEQ_HEAD(resource_head, resource); 46 struct resource { 47 CIRCLEQ_ENTRY(resource) r_link; 48 LIST_ENTRY(resource) r_sharelink; 49 LIST_HEAD(, resource) *r_sharehead; 50 u_long r_start; /* index of the first entry in this resource */ 51 u_long r_end; /* index of the last entry (inclusive) */ 52 u_int r_flags; 53 void *r_virtual; /* virtual address of this resource */ 54 struct device *r_dev; /* device which has allocated this resource */ 55 struct rman *r_rm; /* resource manager from whence this came */ 56 }; 57 58 #define RF_ALLOCATED 0x0001 /* resource has been reserved */ 59 #define RF_ACTIVE 0x0002 /* resource allocation has been activated */ 60 #define RF_SHAREABLE 0x0004 /* resource permits contemporaneous sharing */ 61 #define RF_TIMESHARE 0x0008 /* resource permits time-division sharing */ 62 #define RF_WANTED 0x0010 /* somebody is waiting for this resource */ 63 #define RF_FIRSTSHARE 0x0020 /* first in sharing list */ 64 65 enum rman_type { RMAN_UNINIT = 0, RMAN_GAUGE, RMAN_ARRAY }; 66 67 struct rman { 68 struct resource_head rm_list; 69 struct simplelock *rm_slock; /* mutex used to protect rm_list */ 70 TAILQ_ENTRY(rman) rm_link; /* link in list of all rmans */ 71 u_long rm_start; /* index of globally first entry */ 72 u_long rm_end; /* index of globally last entry */ 73 enum rman_type rm_type; /* what type of resource this is */ 74 const char *rm_descr; /* text descripion of this resource */ 75 }; 76 TAILQ_HEAD(rman_head, rman); 77 78 #ifdef KERNEL 79 80 int rman_activate_resource(struct resource *r); 81 int rman_await_resource(struct resource *r, int pri, int timo); 82 int rman_deactivate_resource(struct resource *r); 83 int rman_fini(struct rman *rm); 84 int rman_init(struct rman *rm); 85 int rman_manage_region(struct rman *rm, u_long start, u_long end); 86 int rman_release_resource(struct resource *r); 87 struct resource *rman_reserve_resource(struct rman *rm, u_long start, 88 u_long end, u_long count, 89 u_int flags, struct device *dev); 90 91 #define rman_set_virtual(r,v) ((r)->r_virtual = (v)) 92 #define rman_get_virtual(r) ((r)->r_virtual) 93 94 extern struct rman_head rman_head; 95 #endif /* KERNEL */ 96 97 #endif /* !_SYS_RMAN_H_ */ 98