vm_unix.c revision 118771
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1988 University of Utah. 31541Srgrimes * Copyright (c) 1991, 1993 41541Srgrimes * The Regents of the University of California. All rights reserved. 51541Srgrimes * 61541Srgrimes * This code is derived from software contributed to Berkeley by 71541Srgrimes * the Systems Programming Group of the University of Utah Computer 81541Srgrimes * Science Department. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 3. All advertising materials mentioning features or use of this software 1958705Scharnier * must display the following acknowledgement: 201541Srgrimes * This product includes software developed by the University of 211541Srgrimes * California, Berkeley and its contributors. 221541Srgrimes * 4. Neither the name of the University nor the names of its contributors 231541Srgrimes * may be used to endorse or promote products derived from this software 241541Srgrimes * without specific prior written permission. 251541Srgrimes * 261541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 331541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 351541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361541Srgrimes * SUCH DAMAGE. 371541Srgrimes * 381541Srgrimes * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 391541Srgrimes * 401541Srgrimes * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 411541Srgrimes */ 421541Srgrimes 431541Srgrimes/* 441541Srgrimes * Traditional sbrk/grow interface to VM 451541Srgrimes */ 4677139Sjhb 47116226Sobrien#include <sys/cdefs.h> 48116226Sobrien__FBSDID("$FreeBSD: head/sys/vm/vm_unix.c 118771 2003-08-11 07:14:08Z bms $"); 49116226Sobrien 501541Srgrimes#include <sys/param.h> 5176166Smarkm#include <sys/lock.h> 5276981Sjhb#include <sys/mutex.h> 531541Srgrimes#include <sys/proc.h> 541541Srgrimes#include <sys/resourcevar.h> 5576981Sjhb#include <sys/sysproto.h> 5676827Salfred#include <sys/systm.h> 571541Srgrimes 581541Srgrimes#include <vm/vm.h> 5912662Sdg#include <vm/vm_param.h> 6012662Sdg#include <vm/pmap.h> 6112662Sdg#include <vm/vm_map.h> 621541Srgrimes 6312221Sbde#ifndef _SYS_SYSPROTO_H_ 641541Srgrimesstruct obreak_args { 6512206Sbde char *nsize; 661541Srgrimes}; 6712221Sbde#endif 681549Srgrimes 6982697Sdillon/* 7082697Sdillon * MPSAFE 7182697Sdillon */ 721541Srgrimes/* ARGSUSED */ 731541Srgrimesint 7483366Sjulianobreak(td, uap) 7583366Sjulian struct thread *td; 761541Srgrimes struct obreak_args *uap; 771541Srgrimes{ 7883366Sjulian struct vmspace *vm = td->td_proc->p_vmspace; 7916679Sdyson vm_offset_t new, old, base; 801541Srgrimes int rv; 8179224Sdillon int error = 0; 82118771Sbms boolean_t do_map_wirefuture; 831541Srgrimes 84118771Sbms do_map_wirefuture = FALSE; 8598460Salc new = round_page((vm_offset_t)uap->nsize); 8698460Salc vm_map_lock(&vm->vm_map); 8779224Sdillon 8816679Sdyson base = round_page((vm_offset_t) vm->vm_daddr); 8966748Sdwmalone old = base + ctob(vm->vm_dsize); 9016679Sdyson if (new > base) { 9166748Sdwmalone /* 9298498Salc * Check the resource limit, but allow a process to reduce 9398498Salc * its usage, even if it remains over the limit. 9466748Sdwmalone */ 9598498Salc if (new - base > td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur && 9698498Salc new > old) { 9779224Sdillon error = ENOMEM; 9879224Sdillon goto done; 9979224Sdillon } 100103767Sjake if (new > vm_map_max(&vm->vm_map)) { 10179224Sdillon error = ENOMEM; 10279224Sdillon goto done; 10379224Sdillon } 10416679Sdyson } else if (new < base) { 10516679Sdyson /* 10616679Sdyson * This is simply an invalid value. If someone wants to 10716679Sdyson * do fancy address space manipulations, mmap and munmap 10816679Sdyson * can do most of what the user would want. 10916679Sdyson */ 11079224Sdillon error = EINVAL; 11179224Sdillon goto done; 11216679Sdyson } 11316679Sdyson if (new > old) { 11498833Sdillon if (vm->vm_map.size + (new - old) > 11598833Sdillon td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 11698833Sdillon error = ENOMEM; 11798833Sdillon goto done; 11898833Sdillon } 11998460Salc rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, 12098460Salc VM_PROT_ALL, VM_PROT_ALL, 0); 1211541Srgrimes if (rv != KERN_SUCCESS) { 12279224Sdillon error = ENOMEM; 12379224Sdillon goto done; 1241541Srgrimes } 12598460Salc vm->vm_dsize += btoc(new - old); 126118771Sbms /* 127118771Sbms * Handle the MAP_WIREFUTURE case for legacy applications, 128118771Sbms * by marking the newly mapped range of pages as wired. 129118771Sbms * We are not required to perform a corresponding 130118771Sbms * vm_map_unwire() before vm_map_delete() below, as 131118771Sbms * it will forcibly unwire the pages in the range. 132118771Sbms * 133118771Sbms * XXX If the pages cannot be wired, no error is returned. 134118771Sbms */ 135118771Sbms if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { 136118771Sbms if (bootverbose) 137118771Sbms printf("obreak: MAP_WIREFUTURE set\n"); 138118771Sbms do_map_wirefuture = TRUE; 139118771Sbms } 14016679Sdyson } else if (new < old) { 14198460Salc rv = vm_map_delete(&vm->vm_map, new, old); 1421541Srgrimes if (rv != KERN_SUCCESS) { 14379224Sdillon error = ENOMEM; 14479224Sdillon goto done; 1451541Srgrimes } 14616679Sdyson vm->vm_dsize -= btoc(old - new); 1471541Srgrimes } 14879224Sdillondone: 14998460Salc vm_map_unlock(&vm->vm_map); 150118771Sbms 151118771Sbms if (do_map_wirefuture) 152118771Sbms (void) vm_map_wire(&vm->vm_map, old, new, 153118771Sbms VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); 154118771Sbms 15579224Sdillon return (error); 1561541Srgrimes} 1571541Srgrimes 15812221Sbde#ifndef _SYS_SYSPROTO_H_ 1591541Srgrimesstruct ovadvise_args { 1605455Sdg int anom; 1611541Srgrimes}; 16212221Sbde#endif 1631549Srgrimes 16482697Sdillon/* 16582697Sdillon * MPSAFE 16682697Sdillon */ 1671541Srgrimes/* ARGSUSED */ 1681541Srgrimesint 16983366Sjulianovadvise(td, uap) 17083366Sjulian struct thread *td; 1711541Srgrimes struct ovadvise_args *uap; 1721541Srgrimes{ 17379224Sdillon /* START_GIANT_OPTIONAL */ 17479224Sdillon /* END_GIANT_OPTIONAL */ 1751541Srgrimes return (EINVAL); 1761541Srgrimes} 177