feat: scheduling, usermode, shell

2026-02-17 19:17:01 +01:00
parent 20fa8a9be2
commit 605fbcbe42
46 changed files with 2622 additions and 98 deletions
@@ -0,0 +1,30 @@
+/*
+    * MSR.hpp
+    * Model-Specific Register read/write helpers
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Hal {
+
+    inline uint64_t ReadMSR(uint32_t msr) {
+        uint32_t lo, hi;
+        asm volatile("rdmsr" : "=a"(lo), "=d"(hi) : "c"(msr));
+        return ((uint64_t)hi << 32) | lo;
+    }
+
+    inline void WriteMSR(uint32_t msr, uint64_t value) {
+        uint32_t lo = (uint32_t)(value & 0xFFFFFFFF);
+        uint32_t hi = (uint32_t)(value >> 32);
+        asm volatile("wrmsr" : : "a"(lo), "d"(hi), "c"(msr));
+    }
+
+    // Well-known MSR addresses
+    static constexpr uint32_t IA32_EFER  = 0xC0000080;
+    static constexpr uint32_t IA32_STAR  = 0xC0000081;
+    static constexpr uint32_t IA32_LSTAR = 0xC0000082;
+    static constexpr uint32_t IA32_FMASK = 0xC0000084;
+
+}