From 5b2ec031ab578caec8fbbdbe5350b9c0df493fd3 Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal@nekernel.org>
Date: Fri, 16 May 2025 09:51:24 +0200
Subject: feat(kernel/ap): Improved and fixed the AP boot flow, also made sure
 that the segment loading for the long mode stub works.

TODO:

 - Stack pointer shall be set when jumping to AP routine.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>
---
 dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc | 39 ++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc

(limited to 'dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc')

diff --git a/dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc b/dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc
new file mode 100644
index 00000000..6aba5b0e
--- /dev/null
+++ b/dev/kernel/HALKit/AMD64/HalAPICDmaWrapper.cc
@@ -0,0 +1,39 @@
+/* -------------------------------------------
+
+  Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#include <HALKit/AMD64/Processor.h>
+#include <modules/ACPI/ACPIFactoryInterface.h>
+
+namespace Kernel::HAL {
+/***********************************************************************************/
+/// Constructors.
+/***********************************************************************************/
+LAPICDmaWrapper::LAPICDmaWrapper(VoidPtr base) : fApic(base) {}
+LAPICDmaWrapper::~LAPICDmaWrapper() = default;
+
+/***********************************************************************************/
+/// @brief Read from APIC controller.
+/// @param reg register.
+/***********************************************************************************/
+UInt32 LAPICDmaWrapper::Read(UInt16 reg) noexcept {
+  MUST_PASS(this->fApic);
+
+  UInt32 volatile* io_apic = (UInt32 volatile*) this->fApic;
+  return io_apic[reg];
+}
+
+/***********************************************************************************/
+/// @brief Write to APIC controller.
+/// @param reg register.
+/// @param value value.
+/***********************************************************************************/
+Void LAPICDmaWrapper::Write(UInt16 reg, UInt32 value) noexcept {
+  MUST_PASS(this->fApic);
+
+  UInt32 volatile* io_apic = (UInt32 volatile*) this->fApic;
+  io_apic[reg]             = value;
+}
+}  // namespace Kernel::HAL
-- 
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