mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:32:44 +00:00
5ab1864497
This is a character device that is being used by the dmidecode utility. We only allow to map the BIOS ROM area to userspace with this device.
78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2021, 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 "MemoryDevice.h"
|
|
#include <AK/Memory.h>
|
|
#include <AK/StdLibExtras.h>
|
|
#include <Kernel/Arch/PC/BIOS.h>
|
|
#include <Kernel/VM/AnonymousVMObject.h>
|
|
#include <Kernel/VM/TypedMapping.h>
|
|
|
|
namespace Kernel {
|
|
|
|
MemoryDevice::MemoryDevice()
|
|
: CharacterDevice(1, 1)
|
|
{
|
|
}
|
|
|
|
MemoryDevice::~MemoryDevice()
|
|
{
|
|
}
|
|
|
|
KResultOr<size_t> MemoryDevice::read(FileDescription&, size_t, UserOrKernelBuffer&, size_t)
|
|
{
|
|
TODO();
|
|
}
|
|
|
|
void MemoryDevice::did_seek(FileDescription&, off_t)
|
|
{
|
|
TODO();
|
|
}
|
|
|
|
KResultOr<Region*> MemoryDevice::mmap(Process& process, FileDescription&, const Range& range, size_t offset, int prot, bool shared)
|
|
{
|
|
auto viewed_address = PhysicalAddress(offset);
|
|
|
|
dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes", viewed_address, range.size());
|
|
if (!MM.is_allowed_to_mmap_to_userspace(viewed_address, range)) {
|
|
dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes failed due to violation of access", viewed_address, range.size());
|
|
return EINVAL;
|
|
}
|
|
|
|
auto vmobject = AnonymousVMObject::create_for_physical_range(viewed_address, range.size());
|
|
if (!vmobject)
|
|
return ENOMEM;
|
|
dbgln("MemoryDevice: Mapped physical memory at {} for range of {} bytes", viewed_address, range.size());
|
|
return process.allocate_region_with_vmobject(
|
|
range,
|
|
vmobject.release_nonnull(),
|
|
0,
|
|
"Mapped Physical Memory",
|
|
prot,
|
|
shared);
|
|
}
|
|
|
|
}
|