diff options
| -rw-r--r-- | sys/vm/default_pager.c | 100 | ||||
| -rw-r--r-- | sys/vm/default_pager.h | 43 |
2 files changed, 143 insertions, 0 deletions
diff --git a/sys/vm/default_pager.c b/sys/vm/default_pager.c new file mode 100644 index 0000000..7bbb99f --- /dev/null +++ b/sys/vm/default_pager.c @@ -0,0 +1,100 @@ +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> + +#include <vm/vm.h> +#include <vm/vm_pager.h> +#include <vm/vm_page.h> +#include <vm/default_pager.h> +#include <vm/swap_pager.h> + +/* + * pagerops for OBJT_DEFAULT - "default pager". + */ +struct pagerops defaultpagerops = { + NULL, + default_pager_alloc, + default_pager_dealloc, + default_pager_getpages, + default_pager_putpages, + default_pager_haspage, + NULL +}; + +/* + * no_pager_alloc just returns an initialized object. + */ +vm_object_t +default_pager_alloc(handle, size, prot, offset) + void *handle; + register vm_size_t size; + vm_prot_t prot; + vm_offset_t offset; +{ + if (handle != NULL) + panic("default_pager_alloc: handle specified"); + + return vm_object_allocate(OBJT_DEFAULT, offset + size); +} + +void +default_pager_dealloc(object) + vm_object_t object; +{ + /* + * OBJT_DEFAULT objects have no special resources allocated to them. + */ +} + +/* + * The default pager has no backing store, so we always return + * failure. + */ +int +default_pager_getpages(object, m, count, reqpage) + vm_object_t object; + vm_page_t *m; + int count; + int reqpage; +{ + return VM_PAGER_FAIL; +} + +int +default_pager_putpages(object, m, c, sync, rtvals) + vm_object_t object; + vm_page_t *m; + int c; + boolean_t sync; + int *rtvals; +{ + int i; + + /* + * Try to convert the object type into a OBJT_SWAP. + * If the swp structure allocation fails, convert it + * back to OBJT_DEFAULT and return failure. Otherwise + * pass this putpages to the swap pager. + */ + object->type = OBJT_SWAP; + + if (swap_pager_swp_alloc(object, M_KERNEL) != 0) { + object->type = OBJT_DEFAULT; + for (i = 0; i < c; i++) + rtvals[i] = VM_PAGER_FAIL; + return VM_PAGER_FAIL; + } + + return swap_pager_putpages(object, m, c, sync, rtvals); +} + +boolean_t +default_pager_haspage(object, offset, before, after) + vm_object_t object; + vm_offset_t offset; + int *before; + int *after; +{ + return FALSE; +} diff --git a/sys/vm/default_pager.h b/sys/vm/default_pager.h new file mode 100644 index 0000000..81789c6 --- /dev/null +++ b/sys/vm/default_pager.h @@ -0,0 +1,43 @@ +/* + * Copyright (c) 1995, David Greenman + * All rights reserved. + * + * 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 David Greenman. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $Id$ + */ + +#ifndef _DEFAULT_PAGER_H_ +#define _DEFAULT_PAGER_H_ 1 + +vm_object_t default_pager_alloc __P((void *, vm_size_t, vm_prot_t, vm_offset_t)); +void default_pager_dealloc __P((vm_object_t)); +int default_pager_getpages __P((vm_object_t, vm_page_t *, int, int)); +int default_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); +boolean_t default_pager_haspage __P((vm_object_t, vm_offset_t, int *, int *)); + +#endif /* _DEFAULT_PAGER_H_ */ |
