Kernel: Remove kernel processes

Kernel can just use raw threads, pretty muchs the only thing that
process provides is syscalls which kernel threads of course don't
need.

Also this makes init process have pid 1 :D

kernel/kernel/Networking/ARPTable.cpp

@@ -18,14 +18,14 @@ namespace Kernel
 	BAN::ErrorOr<BAN::UniqPtr<ARPTable>> ARPTable::create()
 	{
 		auto arp_table = TRY(BAN::UniqPtr<ARPTable>::create());
-		arp_table->m_process = Process::create_kernel(
+		arp_table->m_thread = TRY(Thread::create_kernel(
 			[](void* arp_table_ptr)
 			{
 				auto& arp_table = *reinterpret_cast<ARPTable*>(arp_table_ptr);
 				arp_table.packet_handle_task();
 			}, arp_table.ptr()
-		);
-		ASSERT(arp_table->m_process);
+		));
+		TRY(Processor::scheduler().add_thread(arp_table->m_thread));
 		return arp_table;
 	}
 
@@ -35,9 +35,9 @@ namespace Kernel
 
 	ARPTable::~ARPTable()
 	{
-		if (m_process)
-			m_process->exit(0, SIGKILL);
-		m_process = nullptr;
+		if (m_thread)
+			m_thread->add_signal(SIGKILL);
+		m_thread = nullptr;
 	}
 
 	BAN::ErrorOr<BAN::MACAddress> ARPTable::get_mac_from_ipv4(NetworkInterface& interface, BAN::IPv4Address ipv4_address)

kernel/kernel/Networking/IPv4Layer.cpp

@@ -21,14 +21,14 @@ namespace Kernel
 	BAN::ErrorOr<BAN::UniqPtr<IPv4Layer>> IPv4Layer::create()
 	{
 		auto ipv4_manager = TRY(BAN::UniqPtr<IPv4Layer>::create());
-		ipv4_manager->m_process = Process::create_kernel(
+		ipv4_manager->m_thread = TRY(Thread::create_kernel(
 			[](void* ipv4_manager_ptr)
 			{
 				auto& ipv4_manager = *reinterpret_cast<IPv4Layer*>(ipv4_manager_ptr);
 				ipv4_manager.packet_handle_task();
 			}, ipv4_manager.ptr()
-		);
-		ASSERT(ipv4_manager->m_process);
+		));
+		TRY(Processor::scheduler().add_thread(ipv4_manager->m_thread));
 		ipv4_manager->m_pending_packet_buffer = TRY(VirtualRange::create_to_vaddr_range(
 			PageTable::kernel(),
 			KERNEL_OFFSET,
@@ -46,9 +46,9 @@ namespace Kernel
 
 	IPv4Layer::~IPv4Layer()
 	{
-		if (m_process)
-			m_process->exit(0, SIGKILL);
-		m_process = nullptr;
+		if (m_thread)
+			m_thread->add_signal(SIGKILL);
+		m_thread = nullptr;
 	}
 
 	void IPv4Layer::add_ipv4_header(BAN::ByteSpan packet, BAN::IPv4Address src_ipv4, BAN::IPv4Address dst_ipv4, uint8_t protocol) const

kernel/kernel/Networking/TCPSocket.cpp

@@ -1,6 +1,7 @@
 #include <kernel/Lock/LockGuard.h>
 #include <kernel/Networking/NetworkManager.h>
 #include <kernel/Networking/TCPSocket.h>
+#include <kernel/Process.h>
 #include <kernel/Random.h>
 #include <kernel/Timer/Timer.h>
 
@@ -42,12 +43,13 @@ namespace Kernel
 			PageTable::Flags::ReadWrite | PageTable::Flags::Present,
 			true
 		));
-		socket->m_process = Process::create_kernel(
+		socket->m_thread = TRY(Thread::create_kernel(
 			[](void* socket_ptr)
 			{
 				reinterpret_cast<TCPSocket*>(socket_ptr)->process_task();
 			}, socket.ptr()
-		);
+		));
+		TRY(Processor::scheduler().add_thread(socket->m_thread));
 		// hack to keep socket alive until its process starts
 		socket->ref();
 		return socket;
@@ -63,7 +65,7 @@ namespace Kernel
 	TCPSocket::~TCPSocket()
 	{
 		ASSERT(!is_bound());
-		ASSERT(m_process == nullptr);
+		ASSERT(m_thread == nullptr);
 		dprintln_if(DEBUG_TCP, "Socket destroyed");
 	}
 
@@ -620,7 +622,7 @@ namespace Kernel
 			dprintln_if(DEBUG_TCP, "Socket unbound");
 		}
 
-		m_process = nullptr;
+		m_thread = nullptr;
 	}
 
 	void TCPSocket::remove_listen_child(BAN::RefPtr<TCPSocket> socket)
@@ -652,7 +654,7 @@ namespace Kernel
 
 		LockGuard _(m_mutex);
 
-		while (m_process)
+		while (m_thread)
 		{
 			const uint64_t current_ms = SystemTimer::get().ms_since_boot();
 

kernel/kernel/Networking/UNIX/Socket.cpp

@@ -3,6 +3,7 @@
 #include <kernel/Lock/SpinLockAsMutex.h>
 #include <kernel/Networking/NetworkManager.h>
 #include <kernel/Networking/UNIX/Socket.h>
+#include <kernel/Process.h>
 #include <kernel/Scheduler.h>
 
 #include <fcntl.h>