1/*-
2 * Copyright (c) 2011 NetApp, Inc.
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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35#include <sys/sglist.h>
36#include <sys/lock.h>
37#include <sys/rwlock.h>
38
39#include <vm/vm.h>
40#include <vm/vm_param.h>
41#include <vm/pmap.h>
42#include <vm/vm_map.h>
43#include <vm/vm_object.h>
44#include <vm/vm_page.h>
45#include <vm/vm_pager.h>
46
47#include <machine/md_var.h>
48
49#include "vmm_mem.h"
50
51int
52vmm_mem_init(void)
53{
54
55	return (0);
56}
57
58vm_object_t
59vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len,
60	       vm_paddr_t hpa)
61{
62	int error;
63	vm_object_t obj;
64	struct sglist *sg;
65
66	sg = sglist_alloc(1, M_WAITOK);
67	error = sglist_append_phys(sg, hpa, len);
68	KASSERT(error == 0, ("error %d appending physaddr to sglist", error));
69
70	obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL);
71	if (obj != NULL) {
72		/*
73		 * VT-x ignores the MTRR settings when figuring out the
74		 * memory type for translations obtained through EPT.
75		 *
76		 * Therefore we explicitly force the pages provided by
77		 * this object to be mapped as uncacheable.
78		 */
79		VM_OBJECT_WLOCK(obj);
80		error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE);
81		VM_OBJECT_WUNLOCK(obj);
82		if (error != KERN_SUCCESS) {
83			panic("vmm_mmio_alloc: vm_object_set_memattr error %d",
84				error);
85		}
86		error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0,
87				    VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
88		if (error != KERN_SUCCESS) {
89			vm_object_deallocate(obj);
90			obj = NULL;
91		}
92	}
93
94	/*
95	 * Drop the reference on the sglist.
96	 *
97	 * If the scatter/gather object was successfully allocated then it
98	 * has incremented the reference count on the sglist. Dropping the
99	 * initial reference count ensures that the sglist will be freed
100	 * when the object is deallocated.
101	 *
102	 * If the object could not be allocated then we end up freeing the
103	 * sglist.
104	 */
105	sglist_free(sg);
106
107	return (obj);
108}
109
110void
111vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len)
112{
113
114	vm_map_remove(&vmspace->vm_map, gpa, gpa + len);
115}
116
117vm_paddr_t
118vmm_mem_maxaddr(void)
119{
120
121	return (ptoa(Maxmem));
122}
123