NetBSD-5.0.2/sys/arch/amigappc/amigappc/amiga_init.c

/*	$NetBSD: amiga_init.c,v 1.6 2007/01/24 13:08:13 hubertf Exp $	*/

/*
 * Copyright (c) 1994 Michael L. Hitch
 * Copyright (c) 1993 Markus Wild
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Markus Wild.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * 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 AUTHOR 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: amiga_init.c,v 1.6 2007/01/24 13:08:13 hubertf Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <uvm/uvm_extern.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/buf.h>
#include <sys/msgbuf.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/dkbad.h>
#include <sys/reboot.h>
#include <sys/exec.h>
#include <amiga/amiga/cc.h>

u_long boot_fphystart, boot_fphysize, cphysize;

vaddr_t z2mem_start;		/* XXX */
static vaddr_t z2mem_end;	/* XXX */
int use_z2_mem = 1;		/* XXX */

void *
chipmem_steal(amount)
        long amount;
{
        /*
         * steal from top of chipmem, so we don't collide with
         * the kernel loaded into chipmem in the not-yet-mapped state.
         */
        vaddr_t p = chipmem_end - amount;
        if (p & 1)
                p = p - 1;
        chipmem_end = p;
        if(chipmem_start > chipmem_end)
                panic("not enough chip memory");
        return((void *)p);
}


/*
 * XXX
 * used by certain drivers currently to allocate zorro II memory
 * for bounce buffers, if use_z2_mem is NULL, chipmem will be
 * returned instead.
 * XXX
 */
void *
alloc_z2mem(amount)
	long amount;
{
	if (use_z2_mem && z2mem_end && (z2mem_end - amount) >= z2mem_start) {
		z2mem_end -= amount;
		return ((void *)z2mem_end);
	}
	return (alloc_chipmem(amount));
}