diff options
Diffstat (limited to 'sys/vm/vm_unix.c')
| -rw-r--r-- | sys/vm/vm_unix.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/sys/vm/vm_unix.c b/sys/vm/vm_unix.c new file mode 100644 index 0000000..6bb9917 --- /dev/null +++ b/sys/vm/vm_unix.c @@ -0,0 +1,176 @@ +/*- + * 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. + * 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; + rlim_t datalim, vmemlim; + int rv; + int error = 0; + boolean_t do_map_wirefuture; + + PROC_LOCK(td->td_proc); + datalim = lim_cur(td->td_proc, RLIMIT_DATA); + vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM); + PROC_UNLOCK(td->td_proc); + + 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 > datalim && 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) > vmemlim) { + error = ENOMEM; + goto done; + } + rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, + VM_PROT_RW, 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); +} |
