GDT finally works

kernel/bitmap/bitmap.h

@@ -0,0 +1,36 @@
+#ifndef BITMAP_BITMAP_H_
+#define BITMAP_BITMAP_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+typedef struct {
+  uint8_t *map;
+  size_t nblocks;
+  size_t nbytes;
+  size_t alloc_blocks;
+  size_t last_deep_frag;
+  uintptr_t mem_start;
+  bool init;
+} BitMap;
+
+#define BITMAP_BLOCKS_PER_BYTE 8
+#define BITMAP_BLOCK_SIZE 0x1000
+#define BITMAP_INVALID_BLOCK ((size_t)-1)
+
+void *bitmap_toptr(BitMap *bm, size_t block);
+size_t bitmap_toblock(BitMap *bm, void *ptr);
+size_t bitmap_toblock_roundup(BitMap *bm, void *ptr);
+size_t bitmap_calcsize(size_t total);
+bool bitmap_get(BitMap *bm, size_t block);
+void bitmap_set(BitMap *bm, size_t block, bool value);
+void bitmap_markblocks(BitMap *bm, size_t start, size_t size, bool value);
+void bitmap_markregion(BitMap *bm, void *baseptr, size_t size, bool is_used);
+size_t bitmap_freeregion(BitMap *bm, size_t blocks);
+void *bitmap_alloc(BitMap *bm, size_t blocks);
+void bitmap_free(BitMap *bm, void *base, size_t blocks);
+size_t bitmap_allocpageframe(BitMap *bm);
+void bitmap_freepageframe(BitMap *bm, void *addr);
+
+#endif // BITMAP_BITMAP_H_