1 files changed, 89 insertions, 0 deletions
diff --git a/src/kernel/HALKit/AMD64/HalProcessor.cc b/src/kernel/HALKit/AMD64/HalProcessor.cc
new file mode 100644
index 00000000..d202a758
--- /dev/null
+++ b/src/kernel/HALKit/AMD64/HalProcessor.cc
@@ -0,0 +1,89 @@
+/* ========================================
+
+  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
+
+  File: HalCPU.cc
+  Purpose: Platform processor routines.
+
+======================================== */
+
+#include <HALKit/AMD64/Paging.h>
+#include <HALKit/AMD64/Processor.h>
+
+/**
+ * @file HalCPU.cc
+ * @brief Common CPU API.
+ */
+
+namespace Kernel::HAL {
+inline Bool hal_has_msr() noexcept {
+  static UInt32 eax, unused, edx;  // eax, edx
+
+  __get_cpuid(1, &eax, &unused, &unused, &edx);
+
+  // edx returns the flag for MSR (which is 1 shifted to 5.)
+  return edx & (1 << 5);
+}
+
+Void hal_get_msr(UInt32 msr, UInt32* lo, UInt32* hi) noexcept {
+  if (!lo || !hi) return;
+  asm volatile("rdmsr" : "=a"(*lo), "=d"(*hi) : "c"(msr));
+}
+
+Void hal_set_msr(UInt32 msr, UInt32 lo, UInt32 hi) noexcept {
+  asm volatile("wrmsr" : : "a"(lo), "d"(hi), "c"(msr));
+}
+
+Void lrt_hal_out8(UInt16 port, UInt8 value) {
+  asm volatile("outb %%al, %1" : : "a"(value), "Nd"(port) : "memory");
+}
+
+Void lrt_hal_out16(UInt16 port, UInt16 value) {
+  asm volatile("outw %%ax, %1" : : "a"(value), "Nd"(port) : "memory");
+}
+
+Void lrt_hal_out32(UInt16 port, UInt32 value) {
+  asm volatile("outl %%eax, %1" : : "a"(value), "Nd"(port) : "memory");
+}
+
+UInt8 lrt_hal_in8(UInt16 port) {
+  UInt8 value = 0UL;
+  asm volatile("inb %1, %%al" : "=a"(value) : "Nd"(port) : "memory");
+
+  return value;
+}
+
+UInt16 lrt_hal_in16(UInt16 port) {
+  UInt16 value = 0UL;
+  asm volatile("inw %1, %%ax" : "=a"(value) : "Nd"(port) : "memory");
+
+  return value;
+}
+
+UInt32 lrt_hal_in32(UInt16 port) {
+  UInt32 value = 0UL;
+  asm volatile("inl %1, %%eax" : "=a"(value) : "Nd"(port) : "memory");
+
+  return value;
+}
+
+Void rt_halt() {
+  asm volatile("hlt");
+}
+
+Void rt_cli() {
+  asm volatile("cli");
+}
+
+Void rt_sti() {
+  asm volatile("sti");
+}
+
+Void rt_cld() {
+  asm volatile("cld");
+}
+
+Void rt_std() {
+  asm volatile("std");
+}
+}  // namespace Kernel::HAL