RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-20 13:55:08 +00:00
Code Issues Activity Actions

Kernel: Allow contiguous allocations in physical memory

Browse source 
For that, we have a new type of VMObject, called
ContiguousVMObject, that is responsible for allocating contiguous
physical pages.
This commit is contained in:
Liav A 2020-03-07 19:24:41 +02:00 • committed by Andreas Kling
parent b066586355
commit d6e122fd3a
8 changed files with 219 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

66
Kernel/VM/ContiguousVMObject.cpp Normal file
View file

@ -0,0 +1,66 @@
/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* 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/ContiguousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PhysicalPage.h>
namespace Kernel {
//#define CONTIGUOUS_VMOBJECT_DEBUG
NonnullRefPtr<ContiguousVMObject> ContiguousVMObject::create_with_size(size_t size)
{
return adopt(*new ContiguousVMObject(size));
}
ContiguousVMObject::ContiguousVMObject(size_t size)
: VMObject(size)
{
auto contiguous_physical_pages = MM.allocate_contiguous_supervisor_physical_pages(size);
for (size_t i = 0; i < page_count(); i++) {
physical_pages()[i] = contiguous_physical_pages[i];
#ifdef CONTIGUOUS_VMOBJECT_DEBUG
dbg() << "Contiguous page[" << i << "]: " << physical_pages()[i]->paddr();
#endif
}
}
ContiguousVMObject::ContiguousVMObject(const ContiguousVMObject& other)
: VMObject(other)
{
}
ContiguousVMObject::~ContiguousVMObject()
{
}
NonnullRefPtr<VMObject> ContiguousVMObject::clone()
{
ASSERT_NOT_REACHED();
}
}