| /* |
| * malloc.h |
| * |
| * Internals for the memory allocator |
| */ |
| |
| #include <stdint.h> |
| #include <stddef.h> |
| #include "core.h" |
| #include "thread.h" |
| |
| extern struct semaphore __malloc_semaphore; |
| |
| /* |
| * This is a temporary hack. In Syslinux 5 this will be a pointer to |
| * the owner module. |
| */ |
| typedef size_t malloc_tag_t; |
| enum malloc_owner { |
| MALLOC_FREE, |
| MALLOC_HEAD, |
| MALLOC_CORE, |
| MALLOC_MODULE, |
| }; |
| |
| enum arena_type { |
| ARENA_TYPE_USED = 0, |
| ARENA_TYPE_FREE = 1, |
| ARENA_TYPE_HEAD = 2, |
| ARENA_TYPE_DEAD = 3, |
| }; |
| enum heap { |
| HEAP_MAIN, |
| HEAP_LOWMEM, |
| NHEAP |
| }; |
| |
| #define ARENA_MAGIC 0x20130117 |
| |
| struct free_arena_header; |
| |
| /* |
| * This structure should be a power of two. This becomes the |
| * alignment unit. |
| */ |
| struct arena_header { |
| malloc_tag_t tag; |
| size_t attrs; /* Bits 0..1: Type |
| 2..3: Heap, |
| 4..31: MSB of the size */ |
| struct free_arena_header *next, *prev; |
| |
| #ifdef DEBUG_MALLOC |
| unsigned long _pad[3]; |
| unsigned int magic; |
| #endif |
| }; |
| |
| /* Pad to 2*sizeof(struct arena_header) */ |
| #define ARENA_PADDING ((2 * sizeof(struct arena_header)) - \ |
| (sizeof(struct arena_header) + \ |
| sizeof(struct free_arena_header *) + \ |
| sizeof(struct free_arena_header *))) |
| |
| /* |
| * 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; |
| size_t _pad[ARENA_PADDING]; |
| }; |
| |
| #define ARENA_SIZE_MASK (~(uintptr_t)(sizeof(struct arena_header)-1)) |
| #define ARENA_HEAP_MASK ((size_t)0xc) |
| #define ARENA_HEAP_POS 2 |
| #define ARENA_TYPE_MASK ((size_t)0x3) |
| |
| #define ARENA_ALIGN_UP(p) ((char *)(((uintptr_t)(p) + ~ARENA_SIZE_MASK) \ |
| & ARENA_SIZE_MASK)) |
| #define ARENA_ALIGN_DOWN(p) ((char *)((uintptr_t)(p) & ARENA_SIZE_MASK)) |
| |
| #define ARENA_SIZE_GET(attrs) ((attrs) & ARENA_SIZE_MASK) |
| #define ARENA_HEAP_GET(attrs) (((attrs) & ARENA_HEAP_MASK) >> ARENA_HEAP_POS) |
| #define ARENA_TYPE_GET(attrs) ((attrs) & ARENA_TYPE_MASK) |
| |
| #define ARENA_SIZE_SET(attrs, size) \ |
| ((attrs) = ((size) & ARENA_SIZE_MASK) | ((attrs) & ~ARENA_SIZE_MASK)) |
| #define ARENA_HEAP_SET(attrs, heap) \ |
| ((attrs) = (((heap) << ARENA_HEAP_POS) & ARENA_HEAP_MASK) | \ |
| ((attrs) & ~ARENA_HEAP_MASK)) |
| #define ARENA_TYPE_SET(attrs, type) \ |
| ((attrs) = ((attrs) & ~ARENA_TYPE_MASK) | \ |
| ((type) & ARENA_TYPE_MASK)) |
| |
| extern struct free_arena_header __core_malloc_head[NHEAP]; |
| void __inject_free_block(struct free_arena_header *ah); |