uma_machdep.c revision 331017 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/amd64/amd64/uma_machdep.c 331017 2018-03-15 19:08:33Z kevans $");
31
32#include <sys/param.h>
33#include <sys/lock.h>
34#include <sys/malloc.h>
35#include <sys/mutex.h>
36#include <sys/systm.h>
37#include <sys/vmmeter.h>
38#include <vm/vm.h>
39#include <vm/vm_page.h>
40#include <vm/vm_pageout.h>
41#include <vm/uma.h>
42#include <vm/uma_int.h>
43#include <machine/md_var.h>
44#include <machine/vmparam.h>
45
46void *
47uma_small_alloc(uma_zone_t zone, vm_size_t bytes, u_int8_t *flags, int wait)
48{
49	vm_page_t m;
50	vm_paddr_t pa;
51	void *va;
52
53	*flags = UMA_SLAB_PRIV;
54	m = vm_page_alloc(NULL, 0,
55	    malloc2vm_flags(wait) | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
56	if (m == NULL)
57		return (NULL);
58	pa = m->phys_addr;
59	if ((wait & M_NODUMP) == 0)
60		dump_add_page(pa);
61	va = (void *)PHYS_TO_DMAP(pa);
62	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
63		pagezero(va);
64	return (va);
65}
66
67void
68uma_small_free(void *mem, vm_size_t size, u_int8_t flags)
69{
70	vm_page_t m;
71	vm_paddr_t pa;
72
73	pa = DMAP_TO_PHYS((vm_offset_t)mem);
74	dump_drop_page(pa);
75	m = PHYS_TO_VM_PAGE(pa);
76	m->wire_count--;
77	vm_page_free(m);
78	atomic_subtract_int(&vm_cnt.v_wire_count, 1);
79}
80