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1#ifndef _LIBC_MALLOC_MALLOC_H
2#define _LIBC_MALLOC_MALLOC_H
3
4#include <stdbool.h>
5#include <stddef.h>
6#include <stdint.h>
7#include <sys/cdefs.h>
8#include <sys/types.h>
9
10__BEGIN_DECLS
11
12#define MALLOC_DEFAULT_BLOCK_SIZE 4096
13#define MALLOC_MAX_ALLOCATED_BLOCKS 64
14
15#define FLAG_ALLOCATED (0x1)
16#define FLAG_SLAB (0x2)
17struct __malloc_header {
18 size_t size;
19 uint32_t flags;
20 struct __malloc_header* next;
21 struct __malloc_header* prev;
22};
23typedef struct __malloc_header malloc_header_t;
24
25static inline bool block_has_flags(malloc_header_t* block, uint32_t flags)
26{
27 return ((block->flags & flags) == flags);
28}
29
30static inline void block_set_flags(malloc_header_t* block, uint32_t flags)
31{
32 block->flags |= flags;
33}
34
35static inline void block_rem_flags(malloc_header_t* block, uint32_t flags)
36{
37 block->flags &= (~flags);
38}
39
40static inline bool block_is_allocated(malloc_header_t* block)
41{
42 return block_has_flags(block, FLAG_ALLOCATED);
43}
44
45static inline bool block_is_free(malloc_header_t* block)
46{
47 return !block_has_flags(block, FLAG_ALLOCATED);
48}
49
50static inline bool block_is_slab(malloc_header_t* block)
51{
52 return block_has_flags(block, FLAG_SLAB);
53}
54
55void _malloc_init();
56void _slab_init();
57
58void* malloc(size_t);
59void free(void*);
60void* calloc(size_t, size_t);
61void* realloc(void*, size_t);
62
63void* slab_alloc(size_t);
64void slab_free(malloc_header_t* mem_header);
65
66__END_DECLS
67
68#endif // _LIBC_MALLOC_MALLOC_H