common/syscall/getpagesizes.c

	getpagesizes.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

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

/*
 * Return supported page sizes.
 */
int
getpagesizes(size_t *buf, int nelem)
{
    int i, pagesizes = page_num_user_pagesizes();
    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(size32_t *buf, int nelem)
{
    int i, pagesizes = page_num_user_pagesizes();
    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());
    return (rc);
}
#endif