feat: expand user mode, add DOOM game, add manpages

2026-02-18 15:13:53 +01:00
parent 605fbcbe42
commit 24af60d669
51 changed files with 4484 additions and 43 deletions
@@ -93,6 +93,23 @@ extern "C" void kmain() {
 #if defined (__x86_64__)
    Hal::PrepareGDT();
    Hal::BridgeLoadGDT();
+
+    // Enable SSE/SSE2 — required for userspace programs compiled with SSE
+    // CR0: clear EM (bit 2), set MP (bit 1)
+    {
+        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));
+
+        // CR4: set OSFXSR (bit 9) and OSXMMEXCPT (bit 10)
+        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));
+    }
 #endif

    uint64_t hhdm_offset = hhdm_request.response->offset;