/*      $OpenBSD: sys_machdep.c,v 1.12 2025/10/30 18:23:30 jca Exp $    */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)sys_machdep.c       8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/buf.h>

#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <sys/pledge.h>

#include <uvm/uvm_extern.h>

#include <mips64/cache.h>
#include <mips64/sysarch.h>

#include <machine/autoconf.h>

int     mips64_cacheflush(struct proc *, struct mips64_cacheflush_args *);

int
sys_sysarch(struct proc *p, void *v, register_t *retval)
{
        struct sys_sysarch_args /* {
                syscallarg(int) op;
                syscallarg(char *) parms;
        } */ *uap = v;
        int error = 0;
        int op = SCARG(uap, op);

        if ((p->p_p->ps_flags & PS_PLEDGE) && op != MIPS64_CACHEFLUSH)
                return pledge_fail(p, EINVAL, 0);

        switch(op) {
        case MIPS64_CACHEFLUSH:
            {
                struct mips64_cacheflush_args cfa;

                if ((error = copyin(SCARG(uap, parms), &cfa, sizeof cfa)) != 0)
                        return error;
                error = mips64_cacheflush(p, &cfa);
            }
                break;
        default:
                error = EINVAL;
                break;
        }

        return error;
}

int
mips64_cacheflush(struct proc *p, struct mips64_cacheflush_args *cfa)
{
        vaddr_t va;
        paddr_t pa;
        size_t sz, chunk;
        struct vm_map *map = &p->p_vmspace->vm_map;
        struct pmap *pm = map->pmap;
        struct vm_map_entry *entry;
        int rc = 0;

        /*
         * Sanity checks.
         */
        if ((cfa->which & BCACHE) != cfa->which)
                return EINVAL;

        if (cfa->which == 0)
                return 0;

        va = cfa->va;
        sz = cfa->sz;
        chunk = PAGE_SIZE - (va & PAGE_MASK);
        vm_map_lock_read(map);
        if (va < vm_map_min(map) || va + sz > vm_map_max(map) || va + sz < va)
                rc = EFAULT;
        else while (sz != 0) {
                if (chunk > sz)
                        chunk = sz;

                /*
                 * Check for a resident mapping first, this is faster than
                 * uvm_map_lookup_entry().
                 */
                if (pmap_extract(pm, va, &pa) != 0) {
                        if (cfa->which & ICACHE)
                                Mips_InvalidateICache(p->p_cpu, va, chunk);
                        if (cfa->which & DCACHE)
                                Mips_HitSyncDCache(p->p_cpu, va, chunk);
                } else {
                        if (uvm_map_lookup_entry(map, va, &entry) == FALSE) {
                                rc = EFAULT;
                                break;
                        }
                        /* else simply not resident at the moment */
                }

                va += chunk;
                sz -= chunk;
                chunk = PAGE_SIZE;
        }
        vm_map_unlock_read(map);

        return rc;
}