/*-
 * Copyright (c) 2015 The FreeBSD Foundation
 *
 * This software was developed by Andrew Turner under
 * sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/sysproto.h>

#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>

#include <machine/pcb.h>
#include <machine/sysarch.h>
#include <machine/vmparam.h>

#include <security/audit/audit.h>

int
sysarch(struct thread *td, struct sysarch_args *uap)
{
        struct arm64_guard_page_args gp_args;
        struct pcb *pcb;
        vm_offset_t eva;
        unsigned long sve_len;
        int error;

        switch (uap->op) {
        case ARM64_GUARD_PAGE:
                error = copyin(uap->parms, &gp_args, sizeof(gp_args));
                if (error != 0)
                        return (error);

                /* Only accept canonical addresses, no PAC or TBI */
                if (!ADDR_IS_CANONICAL(gp_args.addr))
                        return (EINVAL);

                eva = gp_args.addr + gp_args.len;

                /* Check for a length overflow */
                if (gp_args.addr > eva)
                        return (EINVAL);

                /* Check in the correct address space */
                if (eva >= VM_MAX_USER_ADDRESS)
                        return (EINVAL);

                /* Nothing to do */
                if (gp_args.len == 0)
                        return (0);

                error = pmap_bti_set(vmspace_pmap(td->td_proc->p_vmspace),
                    trunc_page(gp_args.addr), round_page(eva));
                break;
        case ARM64_GET_SVE_VL:
                pcb = td->td_pcb;
                sve_len = pcb->pcb_sve_len;
                error = EINVAL;
                if (sve_len != 0)
                        error = copyout(&sve_len, uap->parms, sizeof(sve_len));
                break;
        default:
                error = EINVAL;
                break;
        }

        return (error);
}

bool arm64_pid_in_contextidr = false;
SYSCTL_BOOL(_machdep, OID_AUTO, pid_in_contextidr, CTLFLAG_RW,
    &arm64_pid_in_contextidr, false,
    "Save PID into CONTEXTIDR_EL1 register on context switch");