/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/systm.h>
#include <vm/page.h>
#include <sys/errno.h>

/*
 * Return supported page sizes.
 */
int
getpagesizes(int legacy, size_t *buf, int nelem)
{
        int i, pagesizes = page_num_user_pagesizes(legacy);
        size_t *pgsza;

        if (nelem < 0) {
                return (set_errno(EINVAL));
        }
        if (nelem == 0 && buf != NULL) {
                return (set_errno(EINVAL));
        }
        if (nelem == 0 && buf == NULL) {
                return (pagesizes);
        }
        if (buf == NULL) {
                return (set_errno(EINVAL));
        }
        if (nelem > pagesizes) {
                nelem = pagesizes;
        }
        pgsza = kmem_alloc(sizeof (*pgsza) * nelem, KM_SLEEP);
        for (i = 0; i < nelem; i++) {
                pgsza[i] = page_get_user_pagesize(i);
        }
        if (copyout(pgsza, buf, nelem * sizeof (*pgsza)) != 0) {
                kmem_free(pgsza, sizeof (*pgsza) * nelem);
                return (set_errno(EFAULT));
        }
        kmem_free(pgsza, sizeof (*pgsza) * nelem);
        return (nelem);
}

#if defined(_SYSCALL32_IMPL)

/*
 * Some future platforms will support page sizes larger than
 * a 32-bit address space.
 */
int
getpagesizes32(int legacy, size32_t *buf, int nelem)
{
        int i, pagesizes = page_num_user_pagesizes(legacy);
        size32_t *pgsza32;
        size_t pgsz;
        int rc;

        if (nelem < 0) {
                return (set_errno(EINVAL));
        }
        if (nelem == 0 && buf != NULL) {
                return (set_errno(EINVAL));
        }

        pgsza32 = kmem_alloc(sizeof (*pgsza32) * pagesizes, KM_SLEEP);
        for (i = 0; i < pagesizes; i++) {
                pgsz = page_get_user_pagesize(i);
                pgsza32[i] = (size32_t)pgsz;
                if (pgsz > (size32_t)-1) {
                        pagesizes = i - 1;
                        break;
                }
        }
        ASSERT(pagesizes > 0);
        ASSERT(page_get_user_pagesize(pagesizes - 1) <= (size32_t)-1);
        if (nelem > pagesizes) {
                nelem = pagesizes;
        }
        if (nelem == 0 && buf == NULL) {
                rc = pagesizes;
                goto done;
        }
        if (buf == NULL) {
                rc = set_errno(EINVAL);
                goto done;
        }
        if (copyout(pgsza32, buf, nelem * sizeof (*pgsza32)) != 0) {
                rc = set_errno(EFAULT);
                goto done;
        }
        rc = nelem;
done:
        kmem_free(pgsza32, sizeof (*pgsza32) *
            page_num_user_pagesizes(legacy));
        return (rc);
}
#endif