/* * Copyright (c) 1988 University of Utah. * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ * * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 */ /* * Traditional sbrk/grow interface to VM */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/proc.h> #include <sys/resourcevar.h> #include <sys/sysproto.h> #include <sys/systm.h> #include <vm/vm.h> #include <vm/vm_param.h> #include <vm/pmap.h> #include <vm/vm_map.h> #ifndef _SYS_SYSPROTO_H_ struct obreak_args { char *nsize; }; #endif /* * MPSAFE */ /* ARGSUSED */ int obreak(td, uap) struct thread *td; struct obreak_args *uap; { struct vmspace *vm = td->td_proc->p_vmspace; vm_offset_t new, old, base; int rv; int error = 0; boolean_t do_map_wirefuture; do_map_wirefuture = FALSE; new = round_page((vm_offset_t)uap->nsize); vm_map_lock(&vm->vm_map); base = round_page((vm_offset_t) vm->vm_daddr); old = base + ctob(vm->vm_dsize); if (new > base) { /* * Check the resource limit, but allow a process to reduce * its usage, even if it remains over the limit. */ if (new - base > td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) { error = ENOMEM; goto done; } if (new > vm_map_max(&vm->vm_map)) { error = ENOMEM; goto done; } } else if (new < base) { /* * This is simply an invalid value. If someone wants to * do fancy address space manipulations, mmap and munmap * can do most of what the user would want. */ error = EINVAL; goto done; } if (new > old) { if (vm->vm_map.size + (new - old) > td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { error = ENOMEM; goto done; } rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, VM_PROT_ALL, VM_PROT_ALL, 0); if (rv != KERN_SUCCESS) { error = ENOMEM; goto done; } vm->vm_dsize += btoc(new - old); /* * Handle the MAP_WIREFUTURE case for legacy applications, * by marking the newly mapped range of pages as wired. * We are not required to perform a corresponding * vm_map_unwire() before vm_map_delete() below, as * it will forcibly unwire the pages in the range. * * XXX If the pages cannot be wired, no error is returned. */ if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) { if (bootverbose) printf("obreak: MAP_WIREFUTURE set\n"); do_map_wirefuture = TRUE; } } else if (new < old) { rv = vm_map_delete(&vm->vm_map, new, old); if (rv != KERN_SUCCESS) { error = ENOMEM; goto done; } vm->vm_dsize -= btoc(old - new); } done: vm_map_unlock(&vm->vm_map); if (do_map_wirefuture) (void) vm_map_wire(&vm->vm_map, old, new, VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ovadvise_args { int anom; }; #endif /* * MPSAFE */ /* ARGSUSED */ int ovadvise(td, uap) struct thread *td; struct ovadvise_args *uap; { /* START_GIANT_OPTIONAL */ /* END_GIANT_OPTIONAL */ return (EINVAL); }