1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
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 unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/systm.h>
32#include <sys/sysctl.h>
33
34#include <vm/vm.h>
35#include <vm/pmap.h>
36#include <vm/vm_extern.h>
37
38#include "npt.h"
39
40SYSCTL_DECL(_hw_vmm);
41SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
42    NULL);
43
44static int npt_flags;
45SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD,
46	&npt_flags, 0, NULL);
47
48#define NPT_IPIMASK	0xFF
49
50/*
51 * AMD nested page table init.
52 */
53int
54svm_npt_init(int ipinum)
55{
56	int enable_superpage = 1;
57
58	npt_flags = ipinum & NPT_IPIMASK;
59	TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage);
60	if (enable_superpage)
61		npt_flags |= PMAP_PDE_SUPERPAGE;
62
63	return (0);
64}
65
66static int
67npt_pinit(pmap_t pmap)
68{
69
70	return (pmap_pinit_type(pmap, PT_RVI, npt_flags));
71}
72
73struct vmspace *
74svm_npt_alloc(vm_offset_t min, vm_offset_t max)
75{
76
77	return (vmspace_alloc(min, max, npt_pinit));
78}
79
80void
81svm_npt_free(struct vmspace *vmspace)
82{
83
84	vmspace_free(vmspace);
85}
86