diff options
Diffstat (limited to 'usr/klibc/malloc.h')
-rw-r--r-- | usr/klibc/malloc.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/usr/klibc/malloc.h b/usr/klibc/malloc.h new file mode 100644 index 0000000..af97a3f --- /dev/null +++ b/usr/klibc/malloc.h @@ -0,0 +1,50 @@ +/* + * malloc.h + * + * Internals for the memory allocator + */ + +#include <stdint.h> +#include <stddef.h> +#include <klibc/sysconfig.h> + +/* + * This structure should be a power of two. This becomes the + * alignment unit. + */ +struct free_arena_header; + +struct arena_header { + size_t type; + size_t size; + struct free_arena_header *next, *prev; +}; + +#ifdef DEBUG_MALLOC +#define ARENA_TYPE_USED 0x64e69c70 +#define ARENA_TYPE_FREE 0x012d610a +#define ARENA_TYPE_HEAD 0x971676b5 +#define ARENA_TYPE_DEAD 0xeeeeeeee +#else +#define ARENA_TYPE_USED 0 +#define ARENA_TYPE_FREE 1 +#define ARENA_TYPE_HEAD 2 +#endif + +#define MALLOC_CHUNK_MASK (_KLIBC_MALLOC_CHUNK_SIZE-1) + +#define ARENA_SIZE_MASK (~(sizeof(struct arena_header)-1)) + +/* + * This structure should be no more than twice the size of the + * previous structure. + */ +struct free_arena_header { + struct arena_header a; + struct free_arena_header *next_free, *prev_free; +}; + +/* + * Internal variable used by brk/sbrk + */ +extern char *__current_brk; |