From a8e9591bac422b2b0e2fc92b598f55fde3a110c8 Mon Sep 17 00:00:00 2001
From: konrad <konrad@serenityos.org>
Date: Sun, 8 Jan 2023 04:36:28 +0100
Subject: [PATCH] Kernel: Split Aarch64 CPU setup into two stages

Former aims to bring the processor itself into desired state,
while latter allows for additional initialization with heap available.
---
 Kernel/Arch/aarch64/Processor.cpp | 6 +++++-
 Kernel/Arch/aarch64/Processor.h   | 3 ++-
 Kernel/Arch/aarch64/init.cpp      | 4 +++-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/Kernel/Arch/aarch64/Processor.cpp b/Kernel/Arch/aarch64/Processor.cpp
index 1951611270..c4f960aed1 100644
--- a/Kernel/Arch/aarch64/Processor.cpp
+++ b/Kernel/Arch/aarch64/Processor.cpp
@@ -27,7 +27,7 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread) __a
 
 Processor* g_current_processor;
 
-void Processor::initialize(u32 cpu)
+void Processor::install(u32 cpu)
 {
     VERIFY(g_current_processor == nullptr);
     m_features = detect_cpu_features();
@@ -37,6 +37,10 @@ void Processor::initialize(u32 cpu)
     g_current_processor = this;
 }
 
+void Processor::initialize()
+{
+}
+
 [[noreturn]] void Processor::halt()
 {
     disable_interrupts();
diff --git a/Kernel/Arch/aarch64/Processor.h b/Kernel/Arch/aarch64/Processor.h
index b06b3714db..bd71bb138f 100644
--- a/Kernel/Arch/aarch64/Processor.h
+++ b/Kernel/Arch/aarch64/Processor.h
@@ -44,7 +44,8 @@ class Processor {
 public:
     Processor() = default;
 
-    void initialize(u32 cpu);
+    void install(u32 cpu);
+    void initialize();
 
     template<typename T>
     T* get_specific()
diff --git a/Kernel/Arch/aarch64/init.cpp b/Kernel/Arch/aarch64/init.cpp
index 5c9535c698..56ece0bdc8 100644
--- a/Kernel/Arch/aarch64/init.cpp
+++ b/Kernel/Arch/aarch64/init.cpp
@@ -147,7 +147,7 @@ extern "C" [[noreturn]] void init()
     CommandLine::early_initialize("");
 
     new (&bootstrap_processor()) Processor();
-    bootstrap_processor().initialize(0);
+    bootstrap_processor().install(0);
 
     // We want to enable the MMU as fast as possible to make the boot faster.
     init_page_tables();
@@ -159,6 +159,8 @@ extern "C" [[noreturn]] void init()
         (*ctor)();
     kmalloc_init();
 
+    bootstrap_processor().initialize();
+
     load_kernel_symbol_table();
 
     CommandLine::initialize();