mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
ac7ce12123
This was a premature optimization from the early days of SerenityOS. The eternal heap was a simple bump pointer allocator over a static byte array. My original idea was to avoid heap fragmentation and improve data locality, but both ideas were rooted in cargo culting, not data. We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting the rest. This patch replaces all kmalloc_eternal() usage by regular kmalloc().
42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/BlockDevice.h>
|
|
#include <Kernel/Devices/KCOVInstance.h>
|
|
|
|
namespace Kernel {
|
|
class KCOVDevice final : public BlockDevice {
|
|
friend class DeviceManagement;
|
|
|
|
public:
|
|
static HashMap<ProcessID, KCOVInstance*>* proc_instance;
|
|
static HashMap<ThreadID, KCOVInstance*>* thread_instance;
|
|
|
|
static NonnullRefPtr<KCOVDevice> must_create();
|
|
static void free_thread();
|
|
static void free_process();
|
|
|
|
// ^File
|
|
ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
|
|
ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
|
|
|
|
protected:
|
|
KCOVDevice();
|
|
|
|
virtual StringView class_name() const override { return "KCOVDevice"sv; }
|
|
|
|
virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
|
|
virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
|
|
virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
|
|
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
|
|
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
|
|
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
|
|
};
|
|
|
|
}
|