feat(mm): add bitmap physical frame allocator

include/pmm.h

@@ -0,0 +1,18 @@
+#ifndef FROSTBYTE_PMM_H
+#define FROSTBYTE_PMM_H
+
+#include "types.h"
+
+#define frameSize 4096
+
+void pmmInit(uint64 multibootInfo, uint64 protectedEnd);
+uint64 pmmAlloc(void);
+void pmmFree(uint64 frame);
+void pmmReserve(uint64 start, uint64 size);
+uint64 pmmReservedEnd(void);
+uint64 pmmTotalFrames(void);
+uint64 pmmUsedFrames(void);
+uint64 pmmFreeFrames(void);
+uint64 pmmTotalBytes(void);
+
+#endif