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
getpagesizes(int legacy,size_t * buf,int nelem)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
getpagesizes32(int legacy,size32_t * buf,int nelem)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