vm_unix.c revision 125454
1251881Speter/* 2251881Speter * Copyright (c) 1988 University of Utah. 3251881Speter * Copyright (c) 1991, 1993 4251881Speter * The Regents of the University of California. All rights reserved. 5251881Speter * 6251881Speter * This code is derived from software contributed to Berkeley by 7251881Speter * the Systems Programming Group of the University of Utah Computer 8251881Speter * Science Department. 9251881Speter * 10251881Speter * Redistribution and use in source and binary forms, with or without 11251881Speter * modification, are permitted provided that the following conditions 12251881Speter * are met: 13251881Speter * 1. Redistributions of source code must retain the above copyright 14251881Speter * notice, this list of conditions and the following disclaimer. 15251881Speter * 2. Redistributions in binary form must reproduce the above copyright 16251881Speter * notice, this list of conditions and the following disclaimer in the 17251881Speter * documentation and/or other materials provided with the distribution. 18251881Speter * 3. All advertising materials mentioning features or use of this software 19251881Speter * must display the following acknowledgement: 20251881Speter * This product includes software developed by the University of 21251881Speter * California, Berkeley and its contributors. 22251881Speter * 4. Neither the name of the University nor the names of its contributors 23251881Speter * may be used to endorse or promote products derived from this software 24251881Speter * without specific prior written permission. 25251881Speter * 26251881Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27251881Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28251881Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29251881Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30251881Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31251881Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32251881Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33251881Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34251881Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35251881Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36251881Speter * SUCH DAMAGE. 37251881Speter * 38251881Speter * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 39251881Speter * 40251881Speter * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 41251881Speter */ 42251881Speter 43251881Speter/* 44251881Speter * Traditional sbrk/grow interface to VM 45251881Speter */ 46251881Speter 47251881Speter#include <sys/cdefs.h> 48251881Speter__FBSDID("$FreeBSD: head/sys/vm/vm_unix.c 125454 2004-02-04 21:52:57Z jhb $"); 49251881Speter 50251881Speter#include <sys/param.h> 51251881Speter#include <sys/lock.h> 52251881Speter#include <sys/mutex.h> 53251881Speter#include <sys/proc.h> 54251881Speter#include <sys/resourcevar.h> 55251881Speter#include <sys/sysproto.h> 56251881Speter#include <sys/systm.h> 57251881Speter 58251881Speter#include <vm/vm.h> 59251881Speter#include <vm/vm_param.h> 60251881Speter#include <vm/pmap.h> 61251881Speter#include <vm/vm_map.h> 62251881Speter 63251881Speter#ifndef _SYS_SYSPROTO_H_ 64251881Speterstruct obreak_args { 65251881Speter char *nsize; 66251881Speter}; 67251881Speter#endif 68251881Speter 69251881Speter/* 70251881Speter * MPSAFE 71251881Speter */ 72251881Speter/* ARGSUSED */ 73251881Speterint 74251881Speterobreak(td, uap) 75251881Speter struct thread *td; 76251881Speter struct obreak_args *uap; 77251881Speter{ 78251881Speter struct vmspace *vm = td->td_proc->p_vmspace; 79251881Speter vm_offset_t new, old, base; 80251881Speter rlim_t datalim, vmemlim; 81251881Speter int rv; 82251881Speter int error = 0; 83251881Speter boolean_t do_map_wirefuture; 84251881Speter 85251881Speter PROC_LOCK(td->td_proc); 86251881Speter datalim = lim_cur(td->td_proc, RLIMIT_DATA); 87251881Speter vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM); 88251881Speter PROC_UNLOCK(td->td_proc); 89251881Speter 90251881Speter do_map_wirefuture = FALSE; 91251881Speter new = round_page((vm_offset_t)uap->nsize); 92251881Speter vm_map_lock(&vm->vm_map); 93251881Speter 94251881Speter base = round_page((vm_offset_t) vm->vm_daddr); 95251881Speter old = base + ctob(vm->vm_dsize); 96251881Speter if (new > base) { 97251881Speter /* 98251881Speter * Check the resource limit, but allow a process to reduce 99251881Speter * its usage, even if it remains over the limit. 100251881Speter */ 101251881Speter if (new - base > datalim && new > old) { 102251881Speter error = ENOMEM; 103251881Speter goto done; 104251881Speter } 105251881Speter if (new > vm_map_max(&vm->vm_map)) { 106251881Speter error = ENOMEM; 107251881Speter goto done; 108251881Speter } 109251881Speter } else if (new < base) { 110251881Speter /* 111251881Speter * This is simply an invalid value. If someone wants to 112251881Speter * do fancy address space manipulations, mmap and munmap 113251881Speter * can do most of what the user would want. 114251881Speter */ 115251881Speter error = EINVAL; 116251881Speter goto done; 117251881Speter } 118251881Speter if (new > old) { 119251881Speter if (vm->vm_map.size + (new - old) > vmemlim) { 120251881Speter error = ENOMEM; 121251881Speter goto done; 122251881Speter } 123251881Speter rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, 124251881Speter VM_PROT_ALL, VM_PROT_ALL, 0); 125251881Speter if (rv != KERN_SUCCESS) { 126251881Speter error = ENOMEM; 127251881Speter goto done; 128251881Speter } 129251881Speter vm->vm_dsize += btoc(new - old); 130251881Speter /* 131251881Speter * Handle the MAP_WIREFUTURE case for legacy applications, 132251881Speter * by marking the newly mapped range of pages as wired. 133251881Speter * We are not required to perform a corresponding 134251881Speter * vm_map_unwire() before vm_map_delete() below, as 135251881Speter * it will forcibly unwire the pages in the range. 136251881Speter * 137251881Speter * XXX If the pages cannot be wired, no error is returned. 138251881Speter */ 139251881Speter if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { 140251881Speter if (bootverbose) 141251881Speter printf("obreak: MAP_WIREFUTURE set\n"); 142251881Speter do_map_wirefuture = TRUE; 143251881Speter } 144251881Speter } else if (new < old) { 145251881Speter rv = vm_map_delete(&vm->vm_map, new, old); 146251881Speter if (rv != KERN_SUCCESS) { 147251881Speter error = ENOMEM; 148251881Speter goto done; 149251881Speter } 150251881Speter vm->vm_dsize -= btoc(old - new); 151251881Speter } 152251881Speterdone: 153251881Speter vm_map_unlock(&vm->vm_map); 154251881Speter 155251881Speter if (do_map_wirefuture) 156251881Speter (void) vm_map_wire(&vm->vm_map, old, new, 157251881Speter VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); 158251881Speter 159251881Speter return (error); 160251881Speter} 161251881Speter 162251881Speter#ifndef _SYS_SYSPROTO_H_ 163251881Speterstruct ovadvise_args { 164251881Speter int anom; 165251881Speter}; 166251881Speter#endif 167251881Speter 168251881Speter/* 169251881Speter * MPSAFE 170251881Speter */ 171251881Speter/* ARGSUSED */ 172251881Speterint 173251881Speterovadvise(td, uap) 174251881Speter struct thread *td; 175251881Speter struct ovadvise_args *uap; 176251881Speter{ 177251881Speter /* START_GIANT_OPTIONAL */ 178251881Speter /* END_GIANT_OPTIONAL */ 179251881Speter return (EINVAL); 180251881Speter} 181251881Speter