kernel: add aarch64 architecture support

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Kernel/arch/aarch64/madt.cpp

@@ -0,0 +1,97 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "acpi.hpp"
+
+#include <memory.hpp>
+#include <debug.h>
+
+#include "../../kernel.h"
+
+namespace ACPI
+{
+	MADT::MADT(ACPI::MADTHeader *madt)
+	{
+		trace("Initializing MADT");
+		if (!madt)
+		{
+			error("MADT is NULL");
+			return;
+		}
+
+		CPUCores = 0;
+		LAPICAddress = (LAPIC *)(uintptr_t)madt->LocalControllerAddress;
+		for (uint8_t *ptr = (uint8_t *)(madt->Entries);
+			 (uintptr_t)(ptr) < (uintptr_t)(madt) + madt->Header.Length;
+			 ptr += *(ptr + 1))
+		{
+			switch (*(ptr))
+			{
+			case 0:
+			{
+				if (ptr[4] & 1)
+				{
+					lapic.push_back((LocalAPIC *)ptr);
+					KPrint("Local APIC %d (APIC %d) found.", lapic.back()->ACPIProcessorId, lapic.back()->APICId);
+					CPUCores++;
+				}
+				break;
+			}
+			case 1:
+			{
+				ioapic.push_back((MADTIOApic *)ptr);
+				KPrint("I/O APIC %d (Address %#lx) found.", ioapic.back()->APICID, ioapic.back()->Address);
+				Memory::Virtual(KernelPageTable).Map((void *)(uintptr_t)ioapic.back()->Address, (void *)(uintptr_t)ioapic.back()->Address, Memory::PTFlag::RW | Memory::PTFlag::PCD); // Make sure that the address is mapped.
+				break;
+			}
+			case 2:
+			{
+				iso.push_back((MADTIso *)ptr);
+				KPrint("ISO (IRQ:%#lx, BUS:%#lx, GSI:%#lx, %s/%s) found.",
+					   iso.back()->IRQSource, iso.back()->BuSSource, iso.back()->GSI,
+					   iso.back()->Flags & 0x00000004 ? "Active High" : "Active Low",
+					   iso.back()->Flags & 0x00000100 ? "Edge Triggered" : "Level Triggered");
+				break;
+			}
+			case 4:
+			{
+				nmi.push_back((MADTNmi *)ptr);
+				KPrint("NMI %#lx (lint:%#lx) found.", nmi.back()->processor, nmi.back()->lint);
+				break;
+			}
+			case 5:
+			{
+				LAPICAddress = (LAPIC *)ptr;
+				KPrint("APIC found at %#lx", LAPICAddress);
+				break;
+			}
+			default:
+			{
+				KPrint("Unknown MADT entry %#lx", *(ptr));
+				break;
+			}
+			}
+			Memory::Virtual(KernelPageTable).Map((void *)LAPICAddress, (void *)LAPICAddress, Memory::PTFlag::RW | Memory::PTFlag::PCD); // I should map more than one page?
+		}
+		CPUCores--; // We start at 0 (BSP) and end at 11 (APs), so we have 12 cores.
+		KPrint("Total CPU cores: %d", CPUCores + 1);
+	}
+
+	MADT::~MADT()
+	{
+	}
+}

Kernel/arch/aarch64/memory/vmm.cpp

@@ -24,17 +24,46 @@ namespace Memory
 {
 	bool Virtual::Check(void *VirtualAddress, PTFlag Flag, MapType Type)
 	{
+#warning "aarch64 not implemented"
+		return 0;
 	}
 
 	void *Virtual::GetPhysical(void *VirtualAddress)
 	{
+#warning "aarch64 not implemented"
+		return nullptr;
+	}
+
+	Virtual::MapType Virtual::GetMapType(void *VirtualAddress)
+	{
+#warning "aarch64 not implemented"
+		return MapType::NoMapType;
+	}
+
+	PageDirectoryEntry *Virtual::GetPDE(void *VirtualAddress, MapType Type)
+	{
+#warning "aarch64 not implemented"
+		return nullptr;
+	}
+
+	PageTableEntry *Virtual::GetPTE(void *VirtualAddress, MapType Type)
+	{
+#warning "aarch64 not implemented"
+		return nullptr;
 	}
 
 	void Virtual::Map(void *VirtualAddress, void *PhysicalAddress, uint64_t Flags, MapType Type)
 	{
+#warning "aarch64 not implemented"
 	}
 
 	void Virtual::Unmap(void *VirtualAddress, MapType Type)
 	{
+#warning "aarch64 not implemented"
+	}
+
+	void Virtual::Remap(void *VirtualAddress, void *PhysicalAddress, uint64_t Flags, MapType Type)
+	{
+#warning "aarch64 not implemented"
 	}
 }

Kernel/arch/aarch64/syscalls.cpp

@@ -19,9 +19,8 @@
 
 #include <cpu.hpp>
 
-extern "C" __naked __used __no_stack_protector void SystemCallHandlerStub()
+extern "C" __used __no_stack_protector void SystemCallHandlerStub()
 {
-
 }
 
 extern "C" uint64_t SystemCallsHandler(SyscallsFrame *regs);

Kernel/arch/aarch64/tasking/signal.cpp

@@ -0,0 +1,38 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <signal.hpp>
+#include <dumper.hpp>
+#include <task.hpp>
+#include <errno.h>
+
+/* subsystem/linux/syscall.cpp */
+extern int ConvertSignalToLinux(signal_t sig);
+
+namespace Tasking
+{
+	bool Signal::HandleSignal(CPU::SchedulerFrame *tf, void *thread)
+	{
+#warning "aarch64 not implemented"
+		return false;
+	}
+
+	void Signal::RestoreHandleSignal(SyscallsFrame *sf, void *thread)
+	{
+#warning "aarch64 not implemented"
+	}
+}

Kernel/arch/aarch64/tasking/signal_trampoline.s

@@ -0,0 +1,28 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+.global _sig_native_trampoline_start
+_sig_native_trampoline_start:
+
+.global _sig_native_trampoline_end
+_sig_native_trampoline_end:
+
+.global _sig_linux_trampoline_start
+_sig_linux_trampoline_start:
+
+.global _sig_linux_trampoline_end
+_sig_linux_trampoline_end: