jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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 are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/VM/AnonymousVMObject.h>
28#include <Kernel/VM/MemoryManager.h>
29#include <Kernel/VM/PhysicalPage.h>
30
31namespace Kernel {
32
33NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_with_size(size_t size)
34{
35 return adopt(*new AnonymousVMObject(size));
36}
37
38RefPtr<AnonymousVMObject> AnonymousVMObject::create_for_physical_range(PhysicalAddress paddr, size_t size)
39{
40 if (paddr.offset(size) < paddr) {
41 dbg() << "Shenanigans! create_for_physical_range(" << paddr << ", " << size << ") would wrap around";
42 return nullptr;
43 }
44 return adopt(*new AnonymousVMObject(paddr, size));
45}
46
47NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_with_physical_page(PhysicalPage& page)
48{
49 auto vmobject = create_with_size(PAGE_SIZE);
50 vmobject->m_physical_pages[0] = page;
51 return vmobject;
52}
53
54AnonymousVMObject::AnonymousVMObject(size_t size)
55 : VMObject(size)
56{
57#ifndef MAP_SHARED_ZERO_PAGE_LAZILY
58 for (size_t i = 0; i < page_count(); ++i)
59 physical_pages()[i] = MM.shared_zero_page();
60#endif
61}
62
63AnonymousVMObject::AnonymousVMObject(PhysicalAddress paddr, size_t size)
64 : VMObject(size)
65{
66 ASSERT(paddr.page_base() == paddr);
67 for (size_t i = 0; i < page_count(); ++i)
68 physical_pages()[i] = PhysicalPage::create(paddr.offset(i * PAGE_SIZE), false, false);
69}
70
71AnonymousVMObject::AnonymousVMObject(const AnonymousVMObject& other)
72 : VMObject(other)
73{
74}
75
76AnonymousVMObject::~AnonymousVMObject()
77{
78}
79
80NonnullRefPtr<VMObject> AnonymousVMObject::clone()
81{
82 return adopt(*new AnonymousVMObject(*this));
83}
84
85}