xref: /titanic_44/usr/src/uts/common/syscall/getpagesizes.c (revision 40e5e17b3361b3eea56a9723071c406894a20b78)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/types.h>
30 #include <sys/systm.h>
31 #include <vm/page.h>
32 #include <sys/errno.h>
33 
34 /*
35  * Return supported page sizes.
36  */
37 int
38 getpagesizes(size_t *buf, int nelem)
39 {
40 	int i, pagesizes = page_num_user_pagesizes();
41 	size_t *pgsza;
42 
43 	if (nelem < 0) {
44 		return (set_errno(EINVAL));
45 	}
46 	if (nelem == 0 && buf != NULL) {
47 		return (set_errno(EINVAL));
48 	}
49 	if (nelem == 0 && buf == NULL) {
50 		return (pagesizes);
51 	}
52 	if (buf == NULL) {
53 		return (set_errno(EINVAL));
54 	}
55 	if (nelem > pagesizes) {
56 		nelem = pagesizes;
57 	}
58 	pgsza = kmem_alloc(sizeof (*pgsza) * nelem, KM_SLEEP);
59 	for (i = 0; i < nelem; i++) {
60 		pgsza[i] = page_get_user_pagesize(i);
61 	}
62 	if (copyout(pgsza, buf, nelem * sizeof (*pgsza)) != 0) {
63 		kmem_free(pgsza, sizeof (*pgsza) * nelem);
64 		return (set_errno(EFAULT));
65 	}
66 	kmem_free(pgsza, sizeof (*pgsza) * nelem);
67 	return (nelem);
68 }
69 
70 #if defined(_SYSCALL32_IMPL)
71 
72 /*
73  * Some future platforms will support page sizes larger than
74  * a 32-bit address space.
75  */
76 int
77 getpagesizes32(size32_t *buf, int nelem)
78 {
79 	int i, pagesizes = page_num_user_pagesizes();
80 	size32_t *pgsza32;
81 	size_t pgsz;
82 	int rc;
83 
84 	if (nelem < 0) {
85 		return (set_errno(EINVAL));
86 	}
87 	if (nelem == 0 && buf != NULL) {
88 		return (set_errno(EINVAL));
89 	}
90 
91 	pgsza32 = kmem_alloc(sizeof (*pgsza32) * pagesizes, KM_SLEEP);
92 	for (i = 0; i < pagesizes; i++) {
93 		pgsz = page_get_user_pagesize(i);
94 		pgsza32[i] = (size32_t)pgsz;
95 		if (pgsz > (size32_t)-1) {
96 			pagesizes = i - 1;
97 			break;
98 		}
99 	}
100 	ASSERT(pagesizes > 0);
101 	ASSERT(page_get_user_pagesize(pagesizes - 1) <= (size32_t)-1);
102 	if (nelem > pagesizes) {
103 		nelem = pagesizes;
104 	}
105 	if (nelem == 0 && buf == NULL) {
106 		rc = pagesizes;
107 		goto done;
108 	}
109 	if (buf == NULL) {
110 		rc = set_errno(EINVAL);
111 		goto done;
112 	}
113 	if (copyout(pgsza32, buf, nelem * sizeof (*pgsza32)) != 0) {
114 		rc = set_errno(EFAULT);
115 		goto done;
116 	}
117 	rc = nelem;
118 done:
119 	kmem_free(pgsza32, sizeof (*pgsza32) * page_num_user_pagesizes());
120 	return (rc);
121 }
122 #endif
123