GDT, page frame allocator

2025-02-27 19:48:03 +04:00
commit 6f1c6f1316
31 changed files with 2016 additions and 0 deletions
@@ -0,0 +1,49 @@
+#include "Memmap.hpp"
+#include <KernelTerminal/terminal.hpp>
+#include <Common/Panic.hpp>
+
+#include "PageAllocator.hpp"
+
+using namespace Kt;
+
+namespace Memory {
+    LargestSection Scan(limine_memmap_response* mmap) {
+        LargestSection currentLargestSection{};
+
+        for (size_t i = 0; i < mmap->entry_count; i++) {
+            auto entry = mmap->entries[i];
+
+            if (entry->base == 0) {
+                continue;
+            }
+            
+            if (entry->type == LIMINE_MEMMAP_USABLE) {
+                kout << "[Mem] Found conventional memory section (size = " << base::dec << entry->length << " bytes, address = 0x" << base::hex << (uint64_t)entry->base << ")" << newline;                
+                
+                if (entry->length > currentLargestSection.size) {
+                    currentLargestSection = {
+                        .address = (uint64_t)entry->base,
+                        .size = entry->length
+                    };
+                }
+            }
+        }
+
+        [[unlikely]] if (currentLargestSection.address == 0) {
+            Panic("Couldn't find a usable memory section.", System::Registers{});
+        }
+
+        return currentLargestSection;
+
+        // PageAllocator pa(currentLargestSection);
+
+        // uint64_t alloc1 = (uint64_t)pa.Allocate();
+        // uint64_t alloc2 = (uint64_t)pa.Allocate();
+        // pa.Free((void *)alloc2);
+        // uint64_t alloc3 = (uint64_t)pa.Allocate();
+
+        // kout << "0x" << base::hex << alloc1 << "\n";
+        // kout << "0x" << base::hex << alloc2 << "\n";
+        // kout << "0x" << base::hex << alloc3 << "\n";
+    }
+};