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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PhysicalPage.h>
namespace Kernel {
NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_with_size(size_t size)
{
return adopt(*new AnonymousVMObject(size));
}
RefPtr<AnonymousVMObject> AnonymousVMObject::create_for_physical_range(PhysicalAddress paddr, size_t size)
{
if (paddr.offset(size) < paddr) {
dbg() << "Shenanigans! create_for_physical_range(" << paddr << ", " << size << ") would wrap around";
return nullptr;
}
return adopt(*new AnonymousVMObject(paddr, size));
}
NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_with_physical_page(PhysicalPage& page)
{
auto vmobject = create_with_size(PAGE_SIZE);
vmobject->m_physical_pages[0] = page;
return vmobject;
}
AnonymousVMObject::AnonymousVMObject(size_t size)
: VMObject(size)
{
#ifndef MAP_SHARED_ZERO_PAGE_LAZILY
for (size_t i = 0; i < page_count(); ++i)
physical_pages()[i] = MM.shared_zero_page();
#endif
}
AnonymousVMObject::AnonymousVMObject(PhysicalAddress paddr, size_t size)
: VMObject(size)
{
ASSERT(paddr.page_base() == paddr);
for (size_t i = 0; i < page_count(); ++i)
physical_pages()[i] = PhysicalPage::create(paddr.offset(i * PAGE_SIZE), false, false);
}
AnonymousVMObject::AnonymousVMObject(const AnonymousVMObject& other)
: VMObject(other)
{
}
AnonymousVMObject::~AnonymousVMObject()
{
}
NonnullRefPtr<VMObject> AnonymousVMObject::clone()
{
return adopt(*new AnonymousVMObject(*this));
}
}
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