1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 NetApp, Inc.
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 NETAPP, INC ``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 NETAPP, INC 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 * $FreeBSD$
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37#include <sys/sglist.h>
38#include <sys/lock.h>
39#include <sys/rwlock.h>
40
41#include <vm/vm.h>
42#include <vm/vm_param.h>
43#include <vm/pmap.h>
44#include <vm/vm_map.h>
45#include <vm/vm_object.h>
46#include <vm/vm_page.h>
47#include <vm/vm_pager.h>
48
49#include <machine/md_var.h>
50
51#include "vmm_mem.h"
52
53int
54vmm_mem_init(void)
55{
56
57	return (0);
58}
59
60vm_object_t
61vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len,
62	       vm_paddr_t hpa)
63{
64	int error;
65	vm_object_t obj;
66	struct sglist *sg;
67
68	sg = sglist_alloc(1, M_WAITOK);
69	error = sglist_append_phys(sg, hpa, len);
70	KASSERT(error == 0, ("error %d appending physaddr to sglist", error));
71
72	obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL);
73	if (obj != NULL) {
74		/*
75		 * VT-x ignores the MTRR settings when figuring out the
76		 * memory type for translations obtained through EPT.
77		 *
78		 * Therefore we explicitly force the pages provided by
79		 * this object to be mapped as uncacheable.
80		 */
81		VM_OBJECT_WLOCK(obj);
82		error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE);
83		VM_OBJECT_WUNLOCK(obj);
84		if (error != KERN_SUCCESS) {
85			panic("vmm_mmio_alloc: vm_object_set_memattr error %d",
86				error);
87		}
88		error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0,
89				    VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
90		if (error != KERN_SUCCESS) {
91			vm_object_deallocate(obj);
92			obj = NULL;
93		}
94	}
95
96	/*
97	 * Drop the reference on the sglist.
98	 *
99	 * If the scatter/gather object was successfully allocated then it
100	 * has incremented the reference count on the sglist. Dropping the
101	 * initial reference count ensures that the sglist will be freed
102	 * when the object is deallocated.
103	 *
104	 * If the object could not be allocated then we end up freeing the
105	 * sglist.
106	 */
107	sglist_free(sg);
108
109	return (obj);
110}
111
112void
113vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len)
114{
115
116	vm_map_remove(&vmspace->vm_map, gpa, gpa + len);
117}
118
119vm_paddr_t
120vmm_mem_maxaddr(void)
121{
122
123	return (ptoa(Maxmem));
124}
125