/*
 *
 * Device Tree Overlay functions.
 * Copyright (C) 2021 Xilinx Inc.
 * Author Vikram Garhwal <fnu.vikram@xilinx.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
 */

#include "xc_private.h"

int xc_dt_overlay(xc_interface *xch, void *overlay_fdt,
                  uint32_t overlay_fdt_size, uint8_t overlay_op)
{
    int err;
    struct xen_sysctl sysctl = {
        .cmd = XEN_SYSCTL_dt_overlay,
        .u.dt_overlay = {
            .overlay_op = overlay_op,
            .overlay_fdt_size = overlay_fdt_size,
        }
    };

    DECLARE_HYPERCALL_BOUNCE(overlay_fdt, overlay_fdt_size,
                             XC_HYPERCALL_BUFFER_BOUNCE_IN);

    if ( (err = xc_hypercall_bounce_pre(xch, overlay_fdt)) )
        goto err;

    set_xen_guest_handle(sysctl.u.dt_overlay.overlay_fdt, overlay_fdt);

    if ( (err = do_sysctl(xch, &sysctl)) != 0 )
        PERROR("%s failed", __func__);

err:
    xc_hypercall_bounce_post(xch, overlay_fdt);

    return err;
}
