cleanup: move some logic out of kernel Main.cpp into separate files/functions

2026-03-03 20:30:59 +01:00
parent 144ae2a843
commit b0e6dd040d
6 changed files with 110 additions and 53 deletions
@@ -0,0 +1,29 @@
+/*
+    * Cpu.hpp
+    * CPU feature enablement helpers
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Hal {
+
+    // Enable SSE/SSE2 — required for userspace programs compiled with SSE.
+    // CR0: clear EM (bit 2), set MP (bit 1)
+    // CR4: set OSFXSR (bit 9) and OSXMMEXCPT (bit 10)
+    inline void EnableSSE() {
+        uint64_t cr0;
+        asm volatile("mov %%cr0, %0" : "=r"(cr0));
+        cr0 &= ~(1ULL << 2);  // Clear EM
+        cr0 |=  (1ULL << 1);  // Set MP
+        asm volatile("mov %0, %%cr0" :: "r"(cr0));
+
+        uint64_t cr4;
+        asm volatile("mov %%cr4, %0" : "=r"(cr4));
+        cr4 |= (1ULL << 9);   // OSFXSR
+        cr4 |= (1ULL << 10);  // OSXMMEXCPT
+        asm volatile("mov %0, %%cr4" :: "r"(cr4));
+    }
+
+}