1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Anish Gupta ([email protected])
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/cdefs.h>
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 "npt.h"
40
41 SYSCTL_DECL(_hw_vmm);
42 SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
43 NULL);
44
45 static int npt_flags;
46 SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD,
47 &npt_flags, 0, NULL);
48
49 #define NPT_IPIMASK 0xFF
50
51 /*
52 * AMD nested page table init.
53 */
54 int
svm_npt_init(int ipinum)55 svm_npt_init(int ipinum)
56 {
57 int enable_superpage = 1;
58
59 npt_flags = ipinum & NPT_IPIMASK;
60 TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage);
61 if (enable_superpage)
62 npt_flags |= PMAP_PDE_SUPERPAGE;
63
64 return (0);
65 }
66
67 static int
npt_pinit(pmap_t pmap)68 npt_pinit(pmap_t pmap)
69 {
70
71 return (pmap_pinit_type(pmap, PT_RVI, npt_flags));
72 }
73
74 struct vmspace *
svm_npt_alloc(vm_offset_t min,vm_offset_t max)75 svm_npt_alloc(vm_offset_t min, vm_offset_t max)
76 {
77
78 return (vmspace_alloc(min, max, npt_pinit));
79 }
80
81 void
svm_npt_free(struct vmspace * vmspace)82 svm_npt_free(struct vmspace *vmspace)
83 {
84
85 vmspace_free(vmspace);
86 }
87