/*      $OpenBSD: bootarg.c,v 1.12 2015/09/02 01:52:26 yasuoka Exp $    */

/*
 * Copyright (c) 1997,1998 Michael Shalayeff
 * All rights reserved.
 *
 * 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 ``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.
 *
 */

#include <lib/libsa/stand.h>
#include <stand/boot/bootarg.h>

static bootarg_t *bootarg_list;

void
addbootarg(int t, size_t l, void *p)
{
        bootarg_t *q = alloc(sizeof(*q) + l - sizeof(q->ba_arg));

        q->ba_type = t;
        q->ba_size = sizeof(*q) + l - sizeof(q->ba_arg);
        bcopy(p, q->ba_arg, l);
        q->ba_next = bootarg_list;
        bootarg_list = q;
}

void
makebootargs(caddr_t v, size_t *lenp)
{
        bootarg_t *p;
        u_char *q;
        size_t l;

        /* get total size */
        l = sizeof(*p);
        for (p = bootarg_list; p != NULL; p = p->ba_next) {
                l += p->ba_size;
                if (*lenp < l) {
#ifdef DEBUG
                        printf("makebootargs: too many args\n");
#endif
                        l -= p->ba_size;
                        break;
                }
        }
        *lenp = l;
        /* copy them out */
        for (p = bootarg_list, q = v;
             p != NULL && ((q + p->ba_size) - (u_char *)v) <= l - sizeof(*p);
             q += p->ba_size, p = p->ba_next) {
#ifdef DEBUG
                printf("%d,%d ", p->ba_type, p->ba_size);
#endif
                bcopy(p, q, p->ba_size);
        }
        p = (bootarg_t *)q;
        p->ba_type = BOOTARG_END;
}

void
makebootargs32(caddr_t v, size_t *lenp)
{
        bootarg_t       *p;
        u_char          *q;
        size_t           l;
        size_t           adj;
        struct bootarg32 {
                int      ba_type;
                int      ba_size;
                int      ba_nextX;
                char     ba_arg[1];
        }               *p32;

        adj = (ssize_t)sizeof(struct bootarg32) - sizeof(bootarg_t);
        /* get total size */
        l = sizeof(*p32);
        for (p = bootarg_list; p != NULL; p = p->ba_next) {
                l += p->ba_size + adj;
                if (*lenp < l) {
#ifdef DEBUG
                        printf("makebootargs: too many args\n");
#endif
                        l -= p->ba_size + adj;
                        break;
                }
        }
        *lenp = l;
        /* copy them out */
        for (p = bootarg_list, q = v; p != NULL; p = p->ba_next) {
                if (q + p->ba_size + adj > (u_char *)v + l - sizeof(*p32))
                        break;
                p32 = (struct bootarg32 *)q;
                p32->ba_type = p->ba_type;
                p32->ba_size = p->ba_size + adj;
                bcopy(p->ba_arg, p32->ba_arg,
                    p->ba_size - (sizeof(*p) - sizeof(p->ba_arg)));
#ifdef DEBUG
                printf("%d,%d ", p->ba_type, p->ba_size);
#endif
                q += p32->ba_size;
        }
        p32 = (struct bootarg32 *)q;
        p32->ba_type = BOOTARG_END;
}