npt.c revision 276402 
1/*-
2 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/amd64/vmm/amd/npt.c 276402 2014-12-30 07:08:30Z neel $");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/sysctl.h>
34
35#include <vm/vm.h>
36#include <vm/pmap.h>
37#include <vm/vm_extern.h>
38
39#include <machine/pmap.h>
40
41#include "npt.h"
42
43SYSCTL_DECL(_hw_vmm);
44SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW, NULL, NULL);
45
46static int npt_flags;
47SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD,
48	&npt_flags, 0, NULL);
49
50#define NPT_IPIMASK	0xFF
51
52/*
53 * AMD nested page table init.
54 */
55int
56svm_npt_init(int ipinum)
57{
58	int enable_superpage = 1;
59
60	npt_flags = ipinum & NPT_IPIMASK;
61	TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage);
62	if (enable_superpage)
63		npt_flags |= PMAP_PDE_SUPERPAGE;
64
65	return (0);
66}
67
68static int
69npt_pinit(pmap_t pmap)
70{
71
72	return (pmap_pinit_type(pmap, PT_RVI, npt_flags));
73}
74
75struct vmspace *
76svm_npt_alloc(vm_offset_t min, vm_offset_t max)
77{
78
79	return (vmspace_alloc(min, max, npt_pinit));
80}
81
82void
83svm_npt_free(struct vmspace *vmspace)
84{
85
86	vmspace_free(vmspace);
87}
88