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
40 SYSCTL_DECL(_hw_vmm);
41 SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
42 NULL);
43
44 static int npt_flags;
45 SYSCTL_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 */
53 int
svm_npt_init(int ipinum)54 svm_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
66 static int
npt_pinit(pmap_t pmap)67 npt_pinit(pmap_t pmap)
68 {
69
70 return (pmap_pinit_type(pmap, PT_RVI, npt_flags));
71 }
72
73 struct vmspace *
svm_npt_alloc(vm_offset_t min,vm_offset_t max)74 svm_npt_alloc(vm_offset_t min, vm_offset_t max)
75 {
76
77 return (vmspace_alloc(min, max, npt_pinit));
78 }
79
80 void
svm_npt_free(struct vmspace * vmspace)81 svm_npt_free(struct vmspace *vmspace)
82 {
83
84 vmspace_free(vmspace);
85 }
86