mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
2a5d9a6944
This does the exact thing as `adopt_ref`, which is a recent addition to AK. Note that pointers returned by a bare new (without `nothrow`) are guaranteed not to return null, so they can safely be converted into references.
65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "MemoryDevice.h"
|
|
#include <AK/Memory.h>
|
|
#include <AK/StdLibExtras.h>
|
|
#include <Kernel/Arch/PC/BIOS.h>
|
|
#include <Kernel/Panic.h>
|
|
#include <Kernel/Sections.h>
|
|
#include <Kernel/VM/AnonymousVMObject.h>
|
|
#include <Kernel/VM/TypedMapping.h>
|
|
|
|
namespace Kernel {
|
|
|
|
UNMAP_AFTER_INIT NonnullRefPtr<MemoryDevice> MemoryDevice::must_create()
|
|
{
|
|
return adopt_ref(*new MemoryDevice);
|
|
}
|
|
|
|
UNMAP_AFTER_INIT MemoryDevice::MemoryDevice()
|
|
: CharacterDevice(1, 1)
|
|
{
|
|
}
|
|
|
|
UNMAP_AFTER_INIT MemoryDevice::~MemoryDevice()
|
|
{
|
|
}
|
|
|
|
KResultOr<size_t> MemoryDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
|
|
{
|
|
TODO();
|
|
}
|
|
|
|
void MemoryDevice::did_seek(FileDescription&, off_t)
|
|
{
|
|
TODO();
|
|
}
|
|
|
|
KResultOr<Region*> MemoryDevice::mmap(Process& process, FileDescription&, const Range& range, u64 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.space().allocate_region_with_vmobject(
|
|
range,
|
|
vmobject.release_nonnull(),
|
|
0,
|
|
"Mapped Physical Memory",
|
|
prot,
|
|
shared);
|
|
}
|
|
|
|
}
|