/*-
 * Copyright (c) 2003-2004 Hiten Pandya <hmp@backplane.com>
 *
 * 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS, CONTRIBUTORS OR VOICES IN HITEN PANDYA'S HEAD
 * 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.
 *
 * Module that allocates vast amounts of contiguous memory at load-time,
 * it uses contigmalloc(9)/contigfree(9) API.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>

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

#define	NUM_CONTIG_PG   	20
#define	NUM_CONTIG_SIZ  	ctob(NUM_CONTIG_PG)

struct vm_page *pga;
char *addr;

/*
 * vm_contig_alloc_test - just as the name says...
 */
static int
vm_contig_alloc_test(void)
{
	char *p;
	int n;

	pga = vm_page_array;

	addr = contigmalloc((u_long)NUM_CONTIG_SIZ, M_DEVBUF, M_WAITOK, 0, ~0ul,
						PAGE_SIZE, 0);
	if (addr == NULL) {
		uprintf("contigmalloc did not succeed!\n");
		return EINVAL;
	}
	
	uprintf("Number of VM Contig Pages: %d (start addr = %p)\n",
			NUM_CONTIG_SIZ, addr);


	for (p = addr, n = 0 ;
	     p < (addr + (NUM_CONTIG_SIZ));
		 p += PAGE_SIZE, n++) {
		 
	     if (p == addr) {
	         uprintf("First page: va=%p\n", p);
		 } else if (n == NUM_CONTIG_PG - 1) {
			 uprintf("Last page: va=%p\n", p);
		 } else {
		     uprintf("Page: size = %d, number = %2d, addr = %p\n",
	                (vm_offset_t)(vtophys(p) - vtophys(p-PAGE_SIZE)),
					n+1, p);
		 }
	}

	return (0);
}

/*
 * The function called at load/unload.
 */
static int
vmcontig_modevent(struct module *module, int cmd, void *arg)
{
	int error;
	error = 0;

	switch (cmd) {
	case MOD_LOAD:
		error = vm_contig_alloc_test();
		break;
	case MOD_UNLOAD:
	case MOD_SHUTDOWN:
		contigfree(addr, NUM_CONTIG_SIZ, M_DEVBUF);
		uprintf("Contig memory deallocated\n");
		break;
	default:
		error = EINVAL;
		break;
	}
	return error;
}

static moduledata_t mod_data = {
	"vmcontig", vmcontig_modevent, 0
};

DECLARE_MODULE(vmcontig, mod_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);