uma_machdep.c revision 172189 
1/*-
2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/amd64/amd64/uma_machdep.c 172189 2007-09-15 18:47:02Z alc $");
29
30#include <sys/param.h>
31#include <sys/lock.h>
32#include <sys/mutex.h>
33#include <sys/systm.h>
34#include <vm/vm.h>
35#include <vm/vm_page.h>
36#include <vm/vm_pageout.h>
37#include <vm/uma.h>
38#include <vm/uma_int.h>
39#include <machine/md_var.h>
40#include <machine/vmparam.h>
41
42void *
43uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
44{
45	static vm_pindex_t colour;
46	vm_page_t m;
47	vm_paddr_t pa;
48	void *va;
49	int pflags;
50
51	*flags = UMA_SLAB_PRIV;
52	if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
53		pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
54	else
55		pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
56	if (wait & M_ZERO)
57		pflags |= VM_ALLOC_ZERO;
58	for (;;) {
59		m = vm_page_alloc(NULL, colour++, pflags | VM_ALLOC_NOOBJ);
60		if (m == NULL) {
61			if (wait & M_NOWAIT)
62				return (NULL);
63			else
64				VM_WAIT;
65		} else
66			break;
67	}
68	pa = m->phys_addr;
69	dump_add_page(pa);
70	va = (void *)PHYS_TO_DMAP(pa);
71	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
72		pagezero(va);
73	return (va);
74}
75
76void
77uma_small_free(void *mem, int size, u_int8_t flags)
78{
79	vm_page_t m;
80	vm_paddr_t pa;
81
82	pa = DMAP_TO_PHYS((vm_offset_t)mem);
83	dump_drop_page(pa);
84	m = PHYS_TO_VM_PAGE(pa);
85	m->wire_count--;
86	vm_page_free(m);
87	atomic_subtract_int(&cnt.v_wire_count, 1);
88}
89