| 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 | |