os/include/kernel/heap.h

#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>

extern struct Heap_Metadata global_heap;

#ifndef __Heap_Metadata
#define __Heap_Metadata
struct Heap_Metadata {
    struct Heap_Block* start;
    size_t size;
};
#endif

#ifndef __Heap_Block 
#define __Heap_Block
struct Heap_Block {
    struct Heap_Block* next;
    size_t size;
    bool used;
    void* data;
};
#endif

void heap_init();
void* malloc(size_t size);
void* alloc_page(size_t num_pages, struct Heap_Block** ptr);
void free(void *ptr);
void free_page(struct Heap_Block *ptr);