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      1 /*	$NetBSD: lwpctl.h,v 1.4 2008/04/28 20:24:10 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #if !defined(_SYS_LWPCTL_H_)
     33 #define	_SYS_LWPCTL_H_
     34 
     35 /*
     36  * Note on compatibility:
     37  *
     38  * This must be the same size for both 32 and 64-bit processes, since
     39  * the same format will be used by both.
     40  *
     41  * Removal of unused fields is OK, as long as the change in layout
     42  * does not affect supported fields.
     43  *
     44  * It is OK to add fields to this structure, since the kernel allocates
     45  * the space.  Re-use of fields is more complicated - see the feature
     46  * word passed to the system call.
     47  */
     48 typedef struct lwpctl {
     49 	volatile int	lc_curcpu;
     50 	volatile int	lc_pctr;
     51 } lwpctl_t;
     52 
     53 #define	LWPCTL_CPU_NONE		(-1)
     54 #define	LWPCTL_CPU_EXITED	(-2)
     55 
     56 #define	LWPCTL_FEATURE_CURCPU	0x00000001
     57 #define	LWPCTL_FEATURE_PCTR	0x00000002
     58 
     59 #if defined(_KERNEL)
     60 
     61 #include <sys/mutex.h>
     62 
     63 #include <uvm/uvm_extern.h>
     64 
     65 typedef struct lcpage {
     66 	TAILQ_ENTRY(lcpage) lcp_chain;
     67 	vaddr_t		lcp_uaddr;
     68 	vaddr_t		lcp_kaddr;
     69 	u_int		lcp_nfree;
     70 	u_int		lcp_rotor;
     71 	u_int		lcp_bitmap[1];
     72 } lcpage_t;
     73 
     74 typedef struct lcproc {
     75 	kmutex_t	lp_lock;
     76 	struct uvm_object *lp_uao;
     77 	TAILQ_HEAD(,lcpage) lp_pages;
     78 	vaddr_t		lp_cur;
     79 	vaddr_t		lp_max;
     80 	vaddr_t		lp_uva;
     81 } lcproc_t;
     82 
     83 #define	LWPCTL_PER_PAGE		((PAGE_SIZE / sizeof(lwpctl_t)) & ~31)
     84 #define	LWPCTL_BITMAP_ENTRIES	(LWPCTL_PER_PAGE >> 5)
     85 #define	LWPCTL_BITMAP_SZ	(LWPCTL_BITMAP_ENTRIES * sizeof(u_int))
     86 #define	LWPCTL_LCPAGE_SZ	\
     87     (sizeof(lcpage_t) - sizeof(u_int) + LWPCTL_BITMAP_SZ)
     88 #define	LWPCTL_UAREA_SZ		\
     89     (round_page(MAX_LWP_PER_PROC * sizeof(lwpctl_t)))
     90 
     91 int	lwp_ctl_alloc(vaddr_t *);
     92 void	lwp_ctl_free(lwp_t *);
     93 void	lwp_ctl_exit(void);
     94 
     95 #endif /* defined(_KERNEL) */
     96 
     97 #endif /* !_SYS_LWPCTL_H_ */
     98