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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     27 
     28 #include <sys/types.h>
     29 #include <sys/systm.h>
     30 #include <vm/page.h>
     31 #include <sys/errno.h>
     32 
     33 /*
     34  * Return supported page sizes.
     35  */
     36 int
     37 getpagesizes(int legacy, size_t *buf, int nelem)
     38 {
     39 	int i, pagesizes = page_num_user_pagesizes(legacy);
     40 	size_t *pgsza;
     41 
     42 	if (nelem < 0) {
     43 		return (set_errno(EINVAL));
     44 	}
     45 	if (nelem == 0 && buf != NULL) {
     46 		return (set_errno(EINVAL));
     47 	}
     48 	if (nelem == 0 && buf == NULL) {
     49 		return (pagesizes);
     50 	}
     51 	if (buf == NULL) {
     52 		return (set_errno(EINVAL));
     53 	}
     54 	if (nelem > pagesizes) {
     55 		nelem = pagesizes;
     56 	}
     57 	pgsza = kmem_alloc(sizeof (*pgsza) * nelem, KM_SLEEP);
     58 	for (i = 0; i < nelem; i++) {
     59 		pgsza[i] = page_get_user_pagesize(i);
     60 	}
     61 	if (copyout(pgsza, buf, nelem * sizeof (*pgsza)) != 0) {
     62 		kmem_free(pgsza, sizeof (*pgsza) * nelem);
     63 		return (set_errno(EFAULT));
     64 	}
     65 	kmem_free(pgsza, sizeof (*pgsza) * nelem);
     66 	return (nelem);
     67 }
     68 
     69 #if defined(_SYSCALL32_IMPL)
     70 
     71 /*
     72  * Some future platforms will support page sizes larger than
     73  * a 32-bit address space.
     74  */
     75 int
     76 getpagesizes32(int legacy, size32_t *buf, int nelem)
     77 {
     78 	int i, pagesizes = page_num_user_pagesizes(legacy);
     79 	size32_t *pgsza32;
     80 	size_t pgsz;
     81 	int rc;
     82 
     83 	if (nelem < 0) {
     84 		return (set_errno(EINVAL));
     85 	}
     86 	if (nelem == 0 && buf != NULL) {
     87 		return (set_errno(EINVAL));
     88 	}
     89 
     90 	pgsza32 = kmem_alloc(sizeof (*pgsza32) * pagesizes, KM_SLEEP);
     91 	for (i = 0; i < pagesizes; i++) {
     92 		pgsz = page_get_user_pagesize(i);
     93 		pgsza32[i] = (size32_t)pgsz;
     94 		if (pgsz > (size32_t)-1) {
     95 			pagesizes = i - 1;
     96 			break;
     97 		}
     98 	}
     99 	ASSERT(pagesizes > 0);
    100 	ASSERT(page_get_user_pagesize(pagesizes - 1) <= (size32_t)-1);
    101 	if (nelem > pagesizes) {
    102 		nelem = pagesizes;
    103 	}
    104 	if (nelem == 0 && buf == NULL) {
    105 		rc = pagesizes;
    106 		goto done;
    107 	}
    108 	if (buf == NULL) {
    109 		rc = set_errno(EINVAL);
    110 		goto done;
    111 	}
    112 	if (copyout(pgsza32, buf, nelem * sizeof (*pgsza32)) != 0) {
    113 		rc = set_errno(EFAULT);
    114 		goto done;
    115 	}
    116 	rc = nelem;
    117 done:
    118 	kmem_free(pgsza32, sizeof (*pgsza32) *
    119 	    page_num_user_pagesizes(legacy));
    120 	return (rc);
    121 }
    122 #endif
    123